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Establishment of a constitutive model for tungsten carbide with different cobalt content and grain size based on the split Hopkinson pressure bar impact test J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Hao Li, Wei Zhao, Xutao Gao, Weiqi Shi, Ning He
The efficient precision machining of tungsten carbide has always been a challenge for many reasons, one of which is the lacking of fundamental investigations on the dynamic mechanical properties of WC-Co. In this article, five different types of tungsten carbides (WC-8Co, WC-12Co, WC-15Co, WC-15CoX, and WC-20CoC) were tested by the split Hopkinson pressure bar (SHPB) test, and the Johnson-Cook (JC)
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Intelligent prediction using AI-based modeling and optimization of surface roughness in Al7049 end milling with coconut oil under minimum quantity lubrication J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 G. Lavanya, K. Sundaramurthy, V. Subburam, M. Makesh
Metal cutting researchers attempt to develop technology for metal cutting and use of cutting fluids have been continuous due to increasing demands for high productivity. This work reports on the effect of coconut oil under minimum quantity lubrication (MQL) during end milling of AL7049. Dry, wet and MQL approaches are all used to conduct the experimental studies. In contrast to dry and wet machining
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Analysis of load characteristics of wind turbine blade root bolts under loosened and fractured conditions J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Zhipeng Li, Shuyi Yang, Fan Zhang, Yongchun Ding, Yaowei Song, Xianlong He
The loosening and fracture of the blade root bolt, a crucial link between the blade and hub, significantly affect the wind turbine's safe operation. To address this issue, the load redistribution after loosening and fracture of the blade root bolts is considered first. The theoretical model of axial force calculation of the blade root bolts is then deduced and verified through tests. Subsequently,
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Comparative study of the service life of specimens in ABS with single-notch and double-notch J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Hassan Bouhsiss, Achraf Wahid, Abderrazak En-naji, Fatima Gugouch, Abdelkarim Kartouni, Nadia Mouhib
The advancement of polymers continues to expand relentlessly, becoming increasingly crucial to our daily existence. From high-performance sectors to mass-market industries, polymers permeate every facet of our lives. Consequently, it is imperative that we fully comprehend their properties, characteristics, and behavior. In this context, tensile testing are conducted, out on smooth and notched specimens
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Improving data-efficiency of deep generative model for fast design synthesis J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Yiming Zhang, Chen Jia, Hongyi Zhang, Naiyu Fang, Shuyou Zhang, Nam-Ho Kim
The convolutional neural network-based deep generative model (DGM) is a powerful tool for handling image datasets that opens up strategies for fast synthesis of optimum designs at unseen boundary conditions. Existing DGMs for design synthesis are typically based on O (10000) training data, which limits the engineering applications. This paper explores the feasibility of improving DGM data efficiency
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Research on the deformation control of thin-walled part based on gas suspension J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Dongbo Wu, Dongya Chu, Hui Wang
KDP crystal is one of the most important parts in high-powered laser facilities, and the deformation control of KDP crystal has an important impact on the final laser frequency doubling efficiency. This paper proposes an assembly method based on small-hole gas suspending plate compressed gas-assisted support to accurately control the deformation of KDP crystals. First, the flow equation of gas flow
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Study on damage constitutive model of sintered NdFeB under impact J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Yuwei Yao, Lei Li, Liqun Wang, Ziming Hu, Guolai Yang
Compared with a large number of studies on the magnetic field properties of sintered NdFeB, the study on its dynamic mechanical behavior is insufficient, which restricts the further development of materials in a dynamic environment. To break through the above situation, the dynamic mechanical property of sintered NdFeB materials is discussed based on the split-Hopkinson pressure bar (SHPB) experimental
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Experimental study of the natural convection characteristics of finned-tube sodium-to-air heat exchanger J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Jewhan Lee, Jaehong Min, Jung Yoon, Hyungmo Kim
The finned-tube sodium-to-air heat exchanger plays a crucial role in ensuring the safety of prototype Gen IV sodium-cooled fast reactors. It is designed to actively operate with power, but it is also important to consider its passive performance to ensure availability during power-out conditions. This study focused on addressing this limitation through a natural convection experiment using a dedicated
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Derivation of nondimensional rigid-body equation of motion and coupling with flexible body in ANCF J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Kunwoo Kim
The absolute nodal coordinate formulation (ANCF) developed in the mid-1990s can express large rotation, displacement, and deformation in flexible body analysis. However, there is a disadvantage in that the analysis time increases owing to an increase in the degree of freedom. To address this problem, a nondimensional equation of motion was proposed, but existing research related to the nondimensional
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Bifurcation and chaos analysis of the closed-loop gear system of the 3D braiding machine J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Zhijun Sun, Yongbing Liu
To research the special transmission system type of the multistage closed-loop gear system of the 3D braiding machine, a multi-degree of freedom nonlinear dynamic model was established by using the lumped mass method, taking into account parameters such as meshing stiffness, static transmission error, backlash, and meshing damping. To reduce the computational complexity, a gear system with 12 gears
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Dynamic stiffness formulation for vibration characteristics analysis of bi-dimensional functionally graded annular plate of variational thickness J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Chunyu Zhang, Zhenchao Pan, Shunjun Fu, He Yang, Yaqiang Xue
In this paper, a generalized formulation for vibration characteristics investigation of bi-dimensional functionally graded martial annular plates of variational thicknesses is built up using the dynamic stiffness method. The distributions of material attribute both in the radial direction and the thickness direction are in a power-law variation of the constituents’ volume fraction. General solutions
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Novel topology optimization method based on adaptive genetic algorithm to improve the hull rust-removal efficiency of a reaction rotating sprinkler J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Zheng-Shou Chen, Yuan-Jie Chen
Ultra-high-pressure (UHP) water jetting is commonly used to remove rust from ship hulls. However, few studies have been undertaken to optimize the topology of reaction rotating sprinklers (RRS) using UHP. This work proposes two contributions aimed at optimizing the RRS topology and maximizing the efficiency of rust removal. The first contribution is a novel accumulative impinging-duration model, which
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Laser-induced selective wettability transition of 6061 aluminum alloy surfaces J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Changyoung Ryu, Hakgae Kim, Hyoungsoon Lee, Jung Bin In
Laser texturing enables site-selective tailoring of wetting characteristics of metallic surfaces, converting the surfaces into hydrophilic or hydrophobic ones. In this study, selective wettability transition of 6061 aluminum alloy (Al 6061) surface is demonstrated by using a nanosecond fiber laser. The conversion of initial wettability of pristine Al 6061 into a near-superhydrophobic surface is achieved
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Study on the effect of three-dimensional crack initiation and propagation and plastic zone of crack front on fracture-splitting quality of connecting rod J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Wei Deng, Yankun Kong, Jilin Lei, Dewen Jia, Huiping Ji, Guozhong Jin
In this study, the initiation and propagation of three-dimensional cracks in the splitting process of fracture-splitting (FS) connecting rods were studied using finite element simulations and actual production based on fracture mechanics theory. Moreover, the influence of the plastic zone of the crack front on the FS quality was also investigated. The stress and strain distribution characteristics
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Degradation modeling of turbofan engines based on a flexible nonlinear wiener process with random drift diffusion J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Meng Xiao, Ao Shen, Mingjiang Xin, Susu Shan, Yongjian Li
Degradation modeling using condition monitoring (CM) data is fundamental for prognostics and health management (PHM). However, due to the variations in manufacturing materials and operating environments, degradation heterogeneity makes life prediction difficult. Motivated by this problem, a flexible nonlinear Wiener process with random drift diffusion is proposed for degradation modeling. Different
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Reliability analysis of thin-walled ring gear based on tooth surface fatigue and wear J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Boyuan Pang, Xianming Wang, Tianxiao Zhang
Based on the Hertz contact theory, the criterion of local yield strength value and the Archard wear theory, reliability analysis models of two failures are established and validated by the Monte Carlo simulation method to assess the tooth surface fatigue and wear reliability of thin-walled ring gears. Sensitivity analysis is carried out near the design point and assessed for the influence of operational
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Analysis and control of high-speed train lateral vibration on the basis of a conditionally triggered model predictive control strategy J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Ruqiang Mou, Chunjun Chen, Chaoyue Chen, Yaowen Zhang
The lateral vibration of the car body affects the lateral stability of high-speed trains (HSTs), and the aim of this study is to design a good control strategy to decrease the lateral vibration of the car body. First, the Maxwell model of the anti-yaw damper was transformed into a Voigt model by the equivalence method, and a modified 17-degree-of-freedom (DOF) lateral vibration model that includes
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New nonlinear coupled model for modeling the vortex-induced vibrations of flexibly supported circular cylinders J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Shujun Zhang, Aref Afsharfard, Guanbin Chen, Kyung Chun Kim, Wen-Li Chen
The oscillation of a cylinder, which is excited by steady fluid flow, is investigated. Regarding the nonlinearity of real practical structures like marine risers and the stay cable of a long-span bridge, the dynamic behavior of a circular cylinder is described using two nonlinear equations, and the aerodynamic force performance of the wake flow is expressed by the wake oscillator equation. Unlike previous
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Reliable ECG analysis using recognition scores from multiple deep neural networks J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Ji Woon Kim, Sung Min Park, Seong-Wook Choi
The adoption of contactless patient monitoring has surged in response to the COVID-19 pandemic. After implementing remote electrocardiogram monitors, systematic management techniques are necessary to analyze extensive data and identify measurement errors. During the electrocardiogram measurement process, motion artifacts that may occur are often challenging to distinguish from the electrocardiogram
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Anti-impact and lightweight co-optimization design of welded carriage in a mining dump truck considering multi-sources uncertainties J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-04-18 Yinghong Tang, Xin Xie, Jie Lei, Tao Xiong, Ling Zhang, Yingang Xiao, Chengji Mi, Lina Zhan, Hu Mo
The traditional design of welded carriage in a mining dump truck is to cover the dynamic strength through adding thickness of plates. However, the increase in cross-section area can improve the impact strength, but excessive self-weight is adverse to the operation. In order to reduce the redundant weight and improve the impact resistance of welded carriage in a mining dump truck, a novel anti-impact
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Robust GDI-based adaptive recursive sliding mode control (RGDI-ARSMC) for a highly nonlinear MIMO system with varying dynamics of UAV J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-13
Abstract The novelty of the proposed work lies in the control technique, referred to as the robust generalized dynamic inversion based adaptive recursive sliding mode control (RGDI-ARSMC), for addressing various challenges to control a highly coupled and perturbed system called twin rotor MIMO systems (TRMS) UAV. The continuous disturbances, varying parameter values, actuator failure, and unmodeled
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A study on the optimal design for preventing thermal deformation over the oven door J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Hanbin Kim, Rivaldo Mersis Brilianto, Dongkyu Lim, Chul Kim
An oven is a device that generates high heat by using radiation and convection to heat food. Due to the high heat generated when the oven was operating, the door is deformed and a gap is created, and heat leaks through the gap. In this study, in order to prevent heat loss due to deformation of the oven, after we established an analysis technique that reflects the actual operating conditions of the
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Gripper vibration analysis of inspection robot during variable working flight of pre-landing on high-voltage transmission line J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Xiaodong Zhang, Haiming Shen, Ahmad Bala Alhassan, Shaopeng Wang, Haibo Xu
When the high-voltage transmission line inspection robot (HVTIR) with gripper is pre-landing line during flight, the vibration of the landing gripper seriously affects the stability of landing line. To study the vibration characteristics of the flying HVTIR during pre-landing flight, a mass-stiffness-damping vibration model from the rotor to the landing gripper is constructed based on the D’Alembert’s
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Robustness optimization of gas turbine performance evaluation against sensor failures J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Qiwei Cao, Rong Xiang, Shiyi Chen, Wenguo Xiang
Gas turbines operate in harsh environments for long periods of time and their performance will inevitably degrade. Real-time evaluation of gas turbine performance is of great importance for both safety and economy. Considering that gas turbine sensors often fail in harsh environments, in order to improve the reliability of gas turbines against sensor failures, a model for optimizing the robustness
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Importance measure evaluation of manufacturing systems based on improved LeaderRank algorithm J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Dongwei Gu, Wenbo Han, Zhiqiong Wang, Pengfei Chen, Ligang Jia, Rongxian Li
Aiming at the “networked” topological structure layout of equipment in a manufacturing system, and there are many factors in the process of production and operation, it is difficult to evaluate and identify key equipment. The topological structure of equipment in the manufacturing system is mapped into a networked model, and an importance measure analysis method based on improved LeaderRank algorithm
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Computational design of vapor-cooled shield structure for liquid hydrogen storage tank J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Xian You Zhu, Jung Hee Lee, Kyong-Hwan Kim, Seong Hyuk Lee
From the perspective of energy development, the low storage temperature of liquid hydrogen leads to intrusion heat flux and unavoidable evaporation losses during liquid hydrogen storage, limiting the development of hydrogen energy. Vapor-cooled shield (VCS) has been regarded as an outstanding thermal insulation solution for liquefied hydrogen storage. It uses the low-temperature hydrogen vapor evaporating
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A comparison of the erosive wear performance of particle reinforced aluminum matrix composites J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Kemal Yıldızlı, Fehmi Nair, Hafız Muhammad Numan Zafar
Erosive wear is an important industrial issue that needs addressing to avoid failures in the erosive media channels. The current study reports the engineering efforts to enhance the wear performance of ceramic particle (SiC/Al2O3) reinforced AA5083 alloy exposed to low velocity steel erodent particles. Replacing the ceramic reinforcement with particles that have better bonding tendencies with the matrix
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Experimental estimation and numerical comparison of fatigue strength of A356/SiCP composite in T6 condition J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 G. Rakesh, T. Rajasekaran
The aim of the article is to estimate the fatigue strength of T6-treated A356/SiCp composite for 105 cycles experimentally and compared the estimated value numerically. For the experimental estimation staircase method was used and for the numerical method ANSYS Workbench R2023. For this, a composite of A356/SiCp was fabricated using the stir-casting technic. The fabricated composite was T6 heat treated
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Computationally efficient gear shift strategy for hybrid electric vehicles J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Tao Zhang, Huangda Lin, Zhongjun Yu
A collaborative control strategy for gear optimization and energy management of hybrid electric vehicles based on Pontryagin’s minimum principle (PMP) and numerical iteration is proposed in this paper. First, based on PMP, an analytical solution of the power distribution is obtained by introducing a second-order polynomial approximation model of the power-train. The gear control at each moment is obtained
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Fatigue failure of high strength steels under extreme vibrations of military standards: A comparative study J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Mehmet Sefa Gümüş, Mete Kalyoncu
High-strength steels are widely preferred in the design of equipment and vehicles used in the defense industry, which are mostly exposed to random vibrations with supernormal amplitudes during their service life. The motivation of this study is to investigate the performance of high-strength steels in excessive random excitation. To compare the results of different steels extensively used in military
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Multiscale concurrent design of lattice scaffolds driven by structural parameters J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Xiaogang Ji, Wei Wang, Chuang Fang
To address the demand for customized design and prototype manufacturing of micro multifunctional scaffolds, a study was conducted on the optimal design and fabrication of flexible and elastic lattice scaffolds utilizing the digital light processing (DLP) rapid prototyping process. By combining Timoshenko beam theory, a mechanical model was established for the cell structure in three dimensions, including
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Numerical simulation and experimental study of a broadband acoustic metamaterial duct muffler considering thermal-viscous loss J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Dacheng Zhang, Xiaoming Su, Yumeng Sun, Changzheng Chen, Xianming Sun
In this paper, a sub-wavelength sector acoustic metamaterial (SAM) cell was presented for duct noise attenuation. A numerical model considering thermal-viscous loss was established to quantitatively reveal the influence of different structure parameters on the effective bandwidth and peak frequency. Findings clarify that thermal dissipation occurs mainly in the cavity and viscous dissipation exists
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Effect of the arrangement of longitudinal vortex generators on the performance of a parabolic trough solar collector J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Shiquan Zhu, Zongyao Hu, Chuanxiao Cheng, Wenfeng Hu, Shuang Cao, Yuhang Peng, Longjiang Li, Yisen Peng
To enhance the performance of the parabolic trough solar collector (PTSC) and mitigate the circumferential temperature gradient within the absorber tube, a numerical simulation investigation was conducted involving the implementation of vortex generators. The vortex generator was composed of a ring belt and four ribs, and four types of vortex generators M1, M2, M3 and M4 were proposed. The flow and
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Incremental alternating algorithm for damage and fracture modeling using phase-field method J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Thanh Hai Tuan Tran, Jamila Rahmoun, Hakim Naceur
In this work, the investigation was conducted on the introduction of an incremental alternating algorithm for damage and fracture modeling using phase-field method. The proposed approach is based on successive alternate resolutions of the kinematic and damage variables at each time step. The irreversibility condition of damage was forced at each step using the penalty condition within the variational
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Nano-magnetothermal effect enhances the glucose oxidase activity of FVIOs-GOD in antibacterial research J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Qianqian Tang, Ran Xiong, Nana Zhang, Nan Zhang, Xiaoli Liu, Yi Lv, Rongqian Wu
In this study, glucose oxidase (GOD) was fixed on ferrimagnetic vortex-domain iron oxide nanorings (FVIOs) using the covalent bond crosslinking method to create FVIOs-GOD compounds. The activity of surface-conjugated enzymes can be effectively and selectively enhanced by utilizing FVIOs to induce magnetothermal effects under the influence of alternating magnetic fields. GOD can further catalyze the
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The potential of rubber materials as an inhibitor to suppress jet formation of the shaped charge warhead J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-12 Jaehyun Joo, Jeong Whan Yoon
In this paper, as a measure to protect shaped charge, NBR whch is a hyperelastic material, was considered as a target material into which a shaped charge warhead having relatively high speed was impacted. During impact, to what extent NBR can infiltrate into the liner cavity of shaped charge was numerically investigated. The Ogden model combined with the relaxation modulus for NBR was applied in LS-DYNA
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Microslip and energy dissipation behaviors of bonding interface considering rough morphology J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-01
Abstract Lead bonding is a crucial interconnect technology in the fabrication of semiconductor-critical devices. This study presents a mathematical model to analyze the behavior of interface contact during the microslip phenomenon at the lead bonding interface. The model considers the influence of microscopic roughness on the friction coefficient. The investigation focuses on the microslip response
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Investigation of the behavior of water and oil droplets on nanostructured surfaces: a molecular dynamics simulation study J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-01
Abstract This study conducted molecular dynamics simulations to estimate the behavior of water and oil droplets on the same surface and to investigate how oil droplets respond to varying surface conditions. The surfaces were considered from a flat plate to pillared surfaces with varying heights. Additionally, three surface conditions were examined by altering the solid-surface characteristic energy:
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Development of force measurement technique for preheated model in hypersonic combined test facility J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-01
Abstract This paper presents a new force measurement technique to investigate the effect of aerothermodynamic phenomena, particularly aerodynamic heating, on aerodynamic forces. This technique is successfully applied within a hypersonic combined test facility that integrates arc-jet and shock tunnel. A preheated model transport system is developed to axially immobilize the model during preheating,
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Fire dynamics simulation in a cable spreading room of a nuclear power plant using fire test results of heat release and toxic gas emission J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-03-01
Abstract This study proposes a fire dynamics simulation method for combustion modeling using heat release and toxic gas emission experimental data. The feasibility of the proposed method is verified through simulations of a cable spreading room of a nuclear power plant where a high level of safety is required. In addition to CO and CO2, nine other toxic gases are detected in the simulations, and the
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Optimal refrigerant flow configurations in a fin-tube heat exchanger for an indoor unit of a heat pump using R466A J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-15 Amal Vasu, Yeon Sung Yoo, Young Soo Chang
This study investigates the optimal refrigerant flow path for a fin-tube heat exchanger used in the indoor unit of a mini VRF heat pump. Optimal circuitry can significantly enhance the performance of fin-tube heat exchangers. Its performance according to various refrigerant circuitry is evaluated by the developed finite-element-calculation simulation model. The refrigerant circuitry was optimized by
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Enhanced wick-based liquid supply in patterned laser-induced graphene on flexible substrates J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-08 Minsoo Kang, Daeyoung Kong, Junrae Park, Jung Bin In, Hyoungsoon Lee
Advances in MEMS technology have enabled the development of smaller and more efficient electronic devices, integrating nanoscale components. Coupled with progress in flexible semiconductors, the potential applications of flexible electronics have significantly broadened. Yet, wearable and flexible electronics often face challenges related to thermal management owing to the low thermal conductivity
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Influence and sensitivity analysis of mortar void in CRTS II ballastless slab track on the vehicle-track dynamics J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Xin Xin, Suxia Zhou, Zunsong Ren, Chao Yang
Mortar void is the most prevalent disease in CRTS II ballastless slab track aggravating the service performance of vehicle and track structures. For determining a reliable mortar void limit, the influence of mortar void on the vehicle-track dynamics are analyzed through a refined rigid vehicle-flexible track coupled model, considering the randomness induced by track irregularity. Sensitivity analysis
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Influence of initial microstructure on surface integrity of ultrasonic impacting strengthened 34CrNi3MoA steel crankshaft J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Jianzhi Chen, Yunhai Zhuge, Hailiang Ren, Xuwen Jing, Yan Wang, Guochao Li
The ultrasonic impacting process was carried out on the fillet of 34CrNi3MoA steel crankshaft treated by quenching and tempering, medium frequency quenching and gas nitriding respectively, and the variations of surface integrity of crankshaft were analyzed. The results show that the Ra of fillet can be decreased to below 0.2 µm after the ultrasonic impacting. The ultrasonic impacted crankshaft with
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Vibration response of beams supported by finite-thickness elastic foundation under a moving concentrated force J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Jianjun Ma, Ju Wang, Chaosheng Wang, Da Li, Ying Guo
This paper derives the motion equation for a Winkler foundation beam considering the movement of a finite-thickness soil mass under a moving concentrated force. The decay function of foundation displacement is introduced to facilitate this analysis. Using the modal superposition method, displacement formulas for both the forced and free vibration stages of the finite beam are obtained, considering
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An improved model of magnetorheological elastomer of frequency, magnetic field, and amplitude responses J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Quang Du Nguyen, Xuan Bao Nguyen, Cung Le, Hoa Thi Truong, Minh Tien Nguyen
Magnetorheological elastomers (MRE) are smart materials that have recently attracted considerable interest. The mechanical properties of MREs change significantly in the presence of a magnetic field. This study investigates the MRE properties and proposes a new model for designing systems using MRE. First, an MRE material fabrication process is introduced, and the dynamic properties of the MRE are
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Design and structural safety verification of the tank trailer for liquid hydrogen transport J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Hareem Lee, Rivaldo Mersis Brilianto, Seung Seok Lee, Chul Kim
In order to store hydrogen in a liquid state at −253 °C, a double-structured tank trailer with inner and outer vessels is essential for maintaining insulation through a vacuum. While the smaller support of the inner vessel reduces heat loss, it raises concerns regarding its susceptibility to external factors like driving conditions. This study focuses on ensuring the safety of the tank trailer through
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Crosswind impacts on comfort of straddle monorail vehicle running on flexible track beam J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Zhifang Ma, Yunhong Guo
Crosswind is the primary external excitation source of the straddle monorail system. To ensure the ride quality of the monorail system under crosswind, based on multi-rigid body dynamics and finite element method, the coupling model of the monorail vehicle-beam is established, in which the track beam is considered as a flexible sub-model; the vehicle includes traveling/steering/stabilizing wheels and
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Reliability evaluation of components with multiple failure modes based on mixture Weibull distribution using expectation maximization algorithm J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Yuting Wu, Zhong Lu, Jiayu Wu, Xihui Liang
The mixture Weibull distribution is widely used in the reliability analysis of lifetime data of components, especially for those caused by multiple failure modes. In order to accurately estimate the parameters of mixture Weibull distributions, an optimized expectation maximization (EM) algorithm is proposed based on the particle swarm optimization (PSO) algorithm. The Weibull probability plot (WPP)
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Influence of liquid-fuel swirl injection pressure on the flow dynamics characteristics in a lean direct injection gas turbine combustor using Eulerian-Lagrangian large eddy simulations J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Jong-Chan Kim, Euisung Yoo, Hong-Gye Sung
The effect of the injection pressure on the dynamic flow characteristics of a lean direct injection gas turbine combustor under nonreactive conditions during liquid fuel atomization was investigated. The location of the internal recirculation core, size of the vortex breakdown bubble, and shape of the precessing vortex core and shear layer were confirmed by increasing the fuel injection pressure. It
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Imbalanced data fault diagnosis of rolling bearings using enhanced relative generative adversarial network J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Jie Luo, Yinong Zhang, Fan Yang, Xin Jing
Rolling bearings, as integral components of rotating machinery, play a crucial role in ensuring the safe and stable operation of equipment. However, due to the inherent imbalance in the collected actual data, the accuracy of fault diagnosis is significantly compromised. An enhanced relative generative adversarial network (ERGAN) data augmentation model is proposed to improve fault diagnosis capability
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An unsupervised mechanical fault classification method under the condition of unknown number of fault types J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Yalun Zhang, Rongwu Xu, Guo Cheng, Xiufeng Huang, Wenjing Yu
This paper proposes a novel unsupervised classification method to solve the problem of mechanical fault diagnosis under the condition of unknown number of fault types. The proposed method combining the three data processing stage. First, the deep encoding neural networks is used to complete the abstract signal feature representation under the unsupervised conditions. Second, the feature dimensionality
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A study on governance method of casing shear deformation in shale gas well J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Qinglong Lei, Chenyang Chen, Sen Liu, Xiaohua Zhu
Casing deformation occurs frequently in shale gas wells, resulting in the failure of some fracturing stages to complete normal operations, which seriously affects shale gas production. This paper firstly analyzes the casing deformation mechanism of shale gas wells and determines that the casing shear deformation caused by formation slip is the main factor of casing deformation. In order to solve the
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Temperature effects on the resistance capacity of API X60 pipe elbow under bending moment using X-FEM method J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Chaaben Arroussi, Azzedine Belalia, Mohammed Hadj Meliani
In the present study, the X-FEM technique was used to perform this work, taking into consideration the operating service state of the elbow steel. Semi-elliptical defects were created on the internal surface of the extrados section of elbow. Combined pressure, temperature, and bending loads were applied in the numerical investigation. The damage was depicted in moment-rotation curves and was described
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Optimal design of earthquake-resistant containment for FPS-Isolated nuclear power plants with electromagnetic tuned liquid column damper inerter J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-07 Guangcai Han, Yanhong Wu, Gangling Hou, Zhihua Yue
The use of an electromagnetic-tuned liquid column inerter, known as ETLCDI, for mitigating the seismic response in a nuclear containment structure has been studied. The optimization of the structure incorporating the device has rarely been reported. The recently introduced enhanced version of the traditional liquid column inerter, called the ETLCDI, has been designed to meet the demanding requirements
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Overall stiffness derivation and enhancement algorithm of a flying cable-driven parallel robot J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-06
Abstract Flying cable-driven parallel robots (CDPRs) are a special subclass of cable-driven robots that offer mobility in air compared with the traditional CDPRs. These flying CDPRs possess weaker stiffness due to their high maneuverability and cable’s unilaterality, which may result in fluctuations around a desired nominal moving platform pose. The focus of this study is on the derivation of the overall
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Multi-objective optimization of laser welding process parameters of steel/Al based on BO-RF and MOJS J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-06 Xinran Zhang, Yonghuan Guo, Xiying Fan, Jinyue Zhao, Bo Yan, Lanfeng Zhang
The welding of steel/aluminum has great significance for vehicle light weight. The quality of the welding joint largely depends on the selection of process parameters. In this paper, the random forest (RF) model was established to describe the nonlinear relationship between welding process parameters and optimization objectives. We used Bayesian optimization (BO) to adjust the hyperparameters of the
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Workspace analysis and size optimization of planar 3-DOF redundantly actuated parallel mechanism J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-06 Jing Zhang, Dongbao Wang, Ziming Song, Hongwei Guo, Rongqiang Liu, Ziming Kou
Parallel mechanism is widely used due to its high stiffness, strong bearing capacity, small accumulated error, and good dynamic performance. In this paper, a planar three-degree-of-freedom (3-DOF) redundantly actuated parallel mechanism is proposed. Firstly, the position constraint equation is investigated and the inverse position solution is derived. The center velocity mapping model of the moving
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Fractional order time-delayed feedback control of hysteresis dynamics in giant magnetostrictive actuators J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-06 Hongbo Yan, Qingzhen Ma, Jianxin Wang, Xin Fu, Juncheng Yu, Haitao Huang
In order to effectively control the nonlinear dynamic response of the giant magnetostrictive actuator, a design scheme based on fractional-order time-delayed feedback control is proposed in this study. The J-A hysteresis nonlinear mathematical model of the GMA system is established considering the geometric nonlinearity introduced by the precompressed disc spring mechanism. On this basis, the amplitude-frequency
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Design and vibration reduction performance of honeycomb sandwich support rod for wind tunnel J. Mech. Sci. Tech. (IF 1.6) Pub Date : 2024-02-06 Hao Huang, Qingpeng Han, Bin Wu, Rui Zhu, Guangchao Wang
For the support structure of wind tunnel tests, a honeycomb sandwich structure is used to embed the wind tunnel tail brace to form a honeycole test process. Using Rayleigh beam theory and equivalent method, the lateral bending dynamic model of the support rod is solved and the natural frequency expression of the lateral bending vibration of the support rod is obtained. Taking the static strength of