International Journal of Multiphysics最新文献

Dynamic response of blast loaded Hollow Cylindrical and Truncated Conical shells 空心圆柱壳和截锥壳爆炸载荷的动力响应

International Journal of Multiphysics Pub Date : 2023-09-16 DOI: 10.21152/1750-9548.17.3.269

引用次数: 0

Study on optimal design and vibration characteristics of diaphragm spring based on Genetic algorithm 基于遗传算法的膜片弹簧优化设计及振动特性研究

International Journal of Multiphysics Pub Date : 2023-09-16 DOI: 10.21152/1750-9548.17.3.289

{"title":"Study on optimal design and vibration characteristics of diaphragm spring based on Genetic algorithm","authors":"","doi":"10.21152/1750-9548.17.3.289","DOIUrl":"https://doi.org/10.21152/1750-9548.17.3.289","url":null,"abstract":"The parameters of diaphragm spring are optimized and the dimensional parameters in this design are determined with careful derivation. The global optimization feature of the genetic algorithm is used to optimize the diaphragm spring and compared with the damping effect of the standard algorithms. The results show that the optimization design can significantly reduce the force and realize vibration control of the clutch when the design requirements are met. Due to the large error in calculating the vibration characteristics of diaphragm spring by the commonly used A-L method, the finite element method is used to study the influence of the separation finger structure on the load-deflection characteristics of diaphragm spring. To this end, three different window shapes of diaphragm springs are verified in real-life measurements, and the effective pressure test data for three types of diaphragm springs (type A, type B and type C) are selected. Finally, the load displacement of the peak and valley is obtained by summing their averages under loading and unloading of each diaphragm spring model. Moreover, a new method for calculating the vibration characteristics is obtained by introducing the genetic algorithms into the optimal design of diaphragm springs. Compared the A-L method, the finite element method and the proposed method with the measured data, it is verified that the proposed method has high accuracy in calculating the vibration characteristics of diaphragm springs.","PeriodicalId":51903,"journal":{"name":"International Journal of Multiphysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135307038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Numerical Study to Investigate the Hydrodynamic Properties of Nanowire Motion in Liquid 纳米线在液体中运动的流体力学特性的数值研究

International Journal of Multiphysics Pub Date : 2023-09-16 DOI: 10.21152/1750-9548.17.3.333

{"title":"A Numerical Study to Investigate the Hydrodynamic Properties of Nanowire Motion in Liquid","authors":"","doi":"10.21152/1750-9548.17.3.333","DOIUrl":"https://doi.org/10.21152/1750-9548.17.3.333","url":null,"abstract":"Manipulating micro(nano)-sized entities in liquid environment is a challenging yet necessary task in nanoscience and nanotechnology development. Due to the small dimensions, viscous behavior dominates the micro(nano)-sized obejcts motion. In this study, a computational fluid dynamic (CFD) approach has been used to investigate hydrodynamic effects on a nanowire (NM) translating an rotating about its long and short axis. Several numerical methods dealing with solid motion in fluid, including some CFD methods and Finite element analysis (FEA), have been compared. The change in drag coefficient with NW length, NW diameter, translational velocity, rotation speed, and wall effects has been researched. As a model, nanowires with 1-10 µm dimensions and 50 nm-250 nm diameters were investigated in liquid, with velocities of 0.5-500 µm/s. Nanowire is rotated about its long axis with an angular velocity of ω=0.25π, 0.5π, 1.0π, 2.0π rad/s, and about its short axis with a fluid flow allow the rotation of the nanowire whose one end is contsrained to a rotational motion around x and y axis. These models were also compared with the existing analytical models. Good agreement was observed between the numerical results and analytical calculations. The FEA model is also repeated in the closed boundary to investigate the wall effects on the nanowire’s motion in liquid environment.","PeriodicalId":51903,"journal":{"name":"International Journal of Multiphysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135307040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Atmospheric Ice Accretion on Railway Overhead Powerline Conductors- A Numerical Case Study 大气冰在铁路架空电力线导线上的积聚——一个数值案例研究

International Journal of Multiphysics Pub Date : 2023-09-16 DOI: 10.21152/1750-9548.17.3.253

引用次数: 0

Review on Self-Sustainable Power Generation Technologies for Future Typical Wearable Applications 未来典型可穿戴应用的自我可持续发电技术综述

International Journal of Multiphysics Pub Date : 2023-09-16 DOI: 10.21152/1750-9548.17.3.349

{"title":"Review on Self-Sustainable Power Generation Technologies for Future Typical Wearable Applications","authors":"","doi":"10.21152/1750-9548.17.3.349","DOIUrl":"https://doi.org/10.21152/1750-9548.17.3.349","url":null,"abstract":"Wearable technology has broad market prospects in the military, fire protection, medical and health, sports and other fields under its ability to effectively solve practical application needs. Self-powered energy systems with miniaturized, light-weight, highly flexible, stretchable, bendable, and wearable properties have received extensive attention in the industry as they can meet the needs of new-generation wearable electronic devices. Firstly, the article summarizes the recent progress and existing problems of flexible solar cells, flexible triboelectric nanogenerators, flexible piezoelectric nanogenerators, flexible thermoelectric generators, and energy harvesting devices for sweat power generation. Secondly, the development and challenges of flexible lithium-ion batteries and flexible super capacitors for energy storage devices are summarized. The research progress of energy management strategies is also discussed. Then, the main applications of self-powered systems in wearable electronic devices are introduced, including Individual Soldier Equipment, Protective Clothing Devices and Smart Wearable Electronic Devices. Finally, the future development direction of self-powered energy systems for wearable electronic devices is discussed.","PeriodicalId":51903,"journal":{"name":"International Journal of Multiphysics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135305586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of Airflow Behavior for Duplex Circular Cylinders 双圆柱的气流特性研究

International Journal of Multiphysics Pub Date : 2023-09-16 DOI: 10.21152/1750-9548.17.3.235

引用次数: 0

Experimental investigation into the effect of spindle rotational speed on surface roughness and mechanical properties of aluminium 6082T651 welded by friction stir process 主轴转速对搅拌摩擦焊6082T651铝合金表面粗糙度及力学性能影响的实验研究

International Journal of Multiphysics Pub Date : 2023-09-16 DOI: 10.21152/1750-9548.17.3.315

引用次数: 0

Convective Transport through Porous Layers 通过多孔层的对流传输

IF 0.7

International Journal of Multiphysics Pub Date : 2020-03-31 DOI: 10.21152/1750-9548.14.1.53

E. Holzbecher

引用次数: 0

Theoretical Analysis of Shear Wave Interference Patterns by Means of Dynamic Acoustic Radiation Forces. 动态声辐射力对横波干涉图样的理论分析。

IF 0.7

International Journal of Multiphysics Pub Date : 2011-03-01 DOI: 10.1260/1750-9548.5.1.9

Kenneth Hoyt

{"title":"Theoretical Analysis of Shear Wave Interference Patterns by Means of Dynamic Acoustic Radiation Forces.","authors":"Kenneth Hoyt","doi":"10.1260/1750-9548.5.1.9","DOIUrl":"https://doi.org/10.1260/1750-9548.5.1.9","url":null,"abstract":"<p><p>Acoustic radiation forces associated with high intensity focused ultrasound stimulate shear wave propagation allowing shear wave speed and shear viscosity estimation of tissue structures. As wave speeds are meters per second, real time displacement tracking over an extend field-of-view using ultrasound is problematic due to very high frame rate requirements. However, two spatially separated dynamic external sources can stimulate shear wave motion leading to shear wave interference patterns. Advantages are shear waves can be imaged at lower frame rates and local interference pattern spatial properties reflect tissue's viscoelastic properties. Here a theoretical analysis of shear wave interference patterns by means of dynamic acoustic radiation forces is detailed. Using a viscoelastic Green's function analysis, tissue motion due to a pair of focused ultrasound beams and associated radiation forces are presented. Overall, this paper theoretically demonstrates shear wave interference patterns can be stimulated using dynamic acoustic radiation forces and tracked using conventional ultrasound imaging.</p>","PeriodicalId":51903,"journal":{"name":"International Journal of Multiphysics","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2011-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3185381/pdf/nihms-306805.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"30191824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3