Acta Mechanica Sinica最新文献_第6页

Some fundamental issues in buoyancy-driven flows with implications for geophysical and astrophysical systems 浮力驱动流的一些基本问题及其对地球物理和天体物理系统的影响

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-15 DOI: 10.1007/s10409-024-24287-x

Ke-Qing Xia (, ), Kai Leong Chong (, ), Guang-Yu Ding (, ), Lu Zhang (, )

{"title":"Some fundamental issues in buoyancy-driven flows with implications for geophysical and astrophysical systems","authors":"Ke-Qing Xia \u0000 (, ), Kai Leong Chong \u0000 (, ), Guang-Yu Ding \u0000 (, ), Lu Zhang \u0000 (, )","doi":"10.1007/s10409-024-24287-x","DOIUrl":"10.1007/s10409-024-24287-x","url":null,"abstract":"<div><p>Buoyancy-driven flows are prevalent in a wide range of geophysical and astrophysical systems. In this review, we focus on three pivotal effects that significantly influence the dynamics and transport properties of buoyancy-driven flows and may have implications for natural systems. These effects pertain to the role of boundary conditions, the impact of rotation, and the effect of finite size. Boundary conditions represent how the fluid flow interacts with different kinds of surfaces. Rotation, as the Earth’s rotation in geophysical systems or the whirling of astrophysical systems, introduces Coriolis and centrifugal forces, leading to the profound vortical structure and distinct transport property. Finite size, representing geometrical constraints, influences the behavior of buoyancy-driven flows across varying geometrical settings. This review aims to provide a holistic understanding of the intricate interplay of these factors, offering insights into the complex natural phenomena from the perspectives of the three effects.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142913022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kalman filter based state estimation for the flexible multibody system described by ANCF 基于卡尔曼滤波器的 ANCF 柔性多体系统状态估计

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-13 DOI: 10.1007/s10409-024-24373-x

Zuqing Yu (, ), Shuaiyi Liu (, ), Qinglong Tian (, )

{"title":"Kalman filter based state estimation for the flexible multibody system described by ANCF","authors":"Zuqing Yu \u0000 (, ), Shuaiyi Liu \u0000 (, ), Qinglong Tian \u0000 (, )","doi":"10.1007/s10409-024-24373-x","DOIUrl":"10.1007/s10409-024-24373-x","url":null,"abstract":"<div><p>The state estimation of the flexible multibody systems is a vital issue since it is the base of effective control and condition monitoring. The research on the state estimation method of flexible multibody system with large deformation and large rotation remains rare. In this investigation, a state estimator based on multiple nonlinear Kalman filtering algorithms was designed for the flexible multibody systems containing large flexibility components that were discretized by absolute nodal coordinate formulation (ANCF). The state variable vector was constructed based on the independent coordinates which are identified through the constraint Jacobian. Three types of Kalman filters were used to compare their performance in the state estimation for ANCF. Three cases including flexible planar rotating beam, flexible four-bar mechanism, and flexible rotating shaft were employed to verify the proposed state estimator. According to the different performances of the three types of Kalman filter, suggestions were given for the construction of the state estimator for the flexible multibody system.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Asynchronous deployment scheme and multibody modeling of a ring-truss mesh reflector antenna 环形桁架网状反射天线的异步部署方案和多体建模

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-13 DOI: 10.1007/s10409-024-24147-x

Baiyan He (, ), Kangkang Li (, ), Lijun Jia (, ), Rui Nie (, ), Yesen Fan (, ), Guobiao Wang (, )

{"title":"Asynchronous deployment scheme and multibody modeling of a ring-truss mesh reflector antenna","authors":"Baiyan He \u0000 (, ), Kangkang Li \u0000 (, ), Lijun Jia \u0000 (, ), Rui Nie \u0000 (, ), Yesen Fan \u0000 (, ), Guobiao Wang \u0000 (, )","doi":"10.1007/s10409-024-24147-x","DOIUrl":"10.1007/s10409-024-24147-x","url":null,"abstract":"<div><p>Mesh reflector antennas are the mainstream of large space-borne antennas, and the stretching of the truss achieves their deployment. Currently, the truss is commonly designed to be a single degree of freedom (DOF) deployable mechanism with synchronization constraints. However, each deployable unit’s drive distribution and resistance load are uneven, and the forced synchronization constraints lead to the flexible deformation of rods and difficulties in the deployment scheme design. This paper introduces an asynchronous deployment scheme with a multi-DOF closed-chain deployable truss. The DOF of the truss is calculated, and the kinematic and dynamic models are established, considering the truss’s and cable net’s real-time coupling. An integrated solving algorithm for implicit differential-algebraic equations is proposed to solve the dynamic models. A prototype of a six-unit antenna was fabricated, and the experiment was carried out. The dynamic performances in synchronous and asynchronous deployment schemes are analyzed, and the results show that the cable resistance and truss kinetic energy impact under the asynchronous deployment scheme are minor, and the antenna is more straightforward to deploy. The work provides a new asynchronous deployment scheme and a universal antenna modeling method for dynamic design and performance improvement.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electromechanical coupling vibration characteristics of high-speed train transmission system considering gear eccentricity and running resistance 考虑齿轮偏心和运行阻力的高速列车传动系统机电耦合振动特性

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-13 DOI: 10.1007/s10409-024-24307-x

Yeping Yuan (, ), Junguo Wang (, )

{"title":"Electromechanical coupling vibration characteristics of high-speed train transmission system considering gear eccentricity and running resistance","authors":"Yeping Yuan \u0000 (, ), Junguo Wang \u0000 (, )","doi":"10.1007/s10409-024-24307-x","DOIUrl":"10.1007/s10409-024-24307-x","url":null,"abstract":"<div><p>The gear transmission system directly affects the operational performance of high-speed trains (HST). However, current research on gear transmission systems of HST often overlooks the effects of gear eccentricity and running resistance, and the dynamic models of gear transmission system are not sufficiently comprehensive. This paper aims to establish an electromechanical coupling dynamic model of HST traction transmission system and study its electromechanical coupling vibration characteristics, in which the internal excitation factors such as gear eccentricity, time-varying meshing stiffness, backlash, meshing error, and external excitation factors such as electromagnetic torque and running resistance are stressed. The research results indicate that gear eccentricity and running resistance have a significant impact on the stability of the system, and gear eccentricity leads to intensified system vibration and decreased anti-interference ability. In addition, the characteristic frequency of gear eccentricity can be extracted from mechanical signals and current signals as a preliminary basis for eccentricity detection, and electrical signals can also be used to monitor changes in train running resistance in real time. The results of this study provide some useful insights into designing dynamic performance parameters for HST transmission systems and monitoring train operational states.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanoindentation behavior in T-carbon thin films: a molecular dynamics study T 型碳薄膜的纳米压痕行为：分子动力学研究

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-08 DOI: 10.1007/s10409-024-24222-x

Runhua Zhou (, ), Changjin Huang (, ), Narasimalu Srikanth, Lichun Bai (, ), Mao See Wu (, )

{"title":"Nanoindentation behavior in T-carbon thin films: a molecular dynamics study","authors":"Runhua Zhou \u0000 (, ), Changjin Huang \u0000 (, ), Narasimalu Srikanth, Lichun Bai \u0000 (, ), Mao See Wu \u0000 (, )","doi":"10.1007/s10409-024-24222-x","DOIUrl":"10.1007/s10409-024-24222-x","url":null,"abstract":"<div><p>T-carbon is a new allotrope of carbon materials, and it displays high hardness and low density. Nevertheless, the hardening mechanisms of T-carbon thin films under nanoindentation remain elusive. This work utilizes molecular dynamics simulation to explore the hardening mechanisms of T-carbon thin films under nanoindentation with variations of loading velocities and temperatures. The results reveal that a loading velocity increase at a given temperature raises the nanoindentation force. The increase in nanoindentation force is due to graphitization, which is related to the fracture of tetrahedral structures in T-carbon thin films. However, increased graphitization caused by an increased temperature lowers the nanoindentation force at a given loading velocity. The increased graphitization is influenced by both the fractured tetrahedrons and the deformation of inter-tetrahedron bond angles. This is attributed to the loss of thermal stability and the lower density of T-carbon thin films as the temperature increases. These findings have significant implications for the design of nanodevices for specific application requirements.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband tunable acoustic metasurface based on Helmholtz resonators 基于亥姆霍兹谐振器的宽带可调谐声学超表面

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-10-31 DOI: 10.1007/s10409-024-24531-x

Peixin Han (, ), Zhanyu Li (, ), Yonghui Zhang (, ), Xiaoming Zhou (, ), Dongwei Wang (, ), Kai Zhang (, )

引用次数: 0

Failure prediction of thermal barrier coatings on turbine blades under calcium-magnesium-alumina-silicate corrosion and thermal shock 涡轮叶片隔热涂层在钙镁铝硅酸盐腐蚀和热冲击下的失效预测

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-10-29 DOI: 10.1007/s10409-024-24285-x

Zhiyuan Liu (, ), Yiqi Xiao (, ), Li Yang (, ), Wei Liu (, ), Gang Yan (, ), Yu Sun (, ), Yichun Zhou (, )

{"title":"Failure prediction of thermal barrier coatings on turbine blades under calcium-magnesium-alumina-silicate corrosion and thermal shock","authors":"Zhiyuan Liu \u0000 (, ), Yiqi Xiao \u0000 (, ), Li Yang \u0000 (, ), Wei Liu \u0000 (, ), Gang Yan \u0000 (, ), Yu Sun \u0000 (, ), Yichun Zhou \u0000 (, )","doi":"10.1007/s10409-024-24285-x","DOIUrl":"10.1007/s10409-024-24285-x","url":null,"abstract":"<div><p>Failure of thermal barrier coatings (TBCs) can reduce the safety of aero-engines. Predicting the lifetime of TBCs on turbine blades under real service conditions is challenging due to the complex multiscale computation required and the chemo-thermo-mechanically coupled mechanisms involved. This paper proposes a multiscale deep-learning method for TBC failure prediction under typical thermal shock conditions involving calcium-magnesium-alumina-silicate (CMAS) corrosion. A micro-scale model is used to describe local stress and damage with consideration of the TBC microstructure and CMAS infiltration and corrosion mechanisms. A deep learning network is developed to reveal the effect of microscale corrosion on TBC lifetime. The modeled spalling mechanism and area are consistent with the experimental results, with the predicted lifetime being within 20% of that observed. This work provides an effective method for predicting the lifetime of TBCs under real service conditions.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 5","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of quadratic thermal radiation on MHD nanofluid flow across a stretching sheet with variable thickness: Xue and Yamado-Ota thermophysical model 二次热辐射对厚度可变的拉伸片上 MHD 纳米流体流动的影响：Xue 和 Yamado-Ota 热物理模型

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-10-28 DOI: 10.1007/s10409-024-24405-x

Kandavkovi Mallikarjuna Nihaal, Ulavathi Shettar Mahabaleshwar, Dia Zeidan, Sang Woo Joo

{"title":"Impact of quadratic thermal radiation on MHD nanofluid flow across a stretching sheet with variable thickness: Xue and Yamado-Ota thermophysical model","authors":"Kandavkovi Mallikarjuna Nihaal, Ulavathi Shettar Mahabaleshwar, Dia Zeidan, Sang Woo Joo","doi":"10.1007/s10409-024-24405-x","DOIUrl":"10.1007/s10409-024-24405-x","url":null,"abstract":"<div><p>The work comparing the Yamada-Ota and Xue models for nanoparticle flow across a stretching surface has benefits in nanotechnology, medicinal treatments, environmental engineering, renewable energy, and heat exchangers. Most published nanofluid flow models assumed constant thermal conductivity and viscosity. With such great physiognomies in mind, the novelty of this work focuses on comparing the performance of the nanofluid models, Xue, and Yamada-Ota models on a stretched sheet with variable thickness under the influence of a magnetic field and quadratic thermal radiation. The altered boundary layer equations for momentum and temperature, subject to adequate boundary conditions, are numerically solved using an optimized, efficient, and extensive bvp-4c approach. The effects of non-dimensional constraints such as magnetic field, power index of velocity, wall thickness parameter, and quadratic radiation parameter on momentum and temperature profile in the boundary layer area are analyzed thoroughly and outcomes were illustrated graphically. Additionally, the consequences of certain distinctive parameters over engineering factors are also examined and results were presented in tabular form. From the outcomes, it is seen that fluid velocity slows down in the presence of a magnetic field but the opposite nature is observed in the case of temperature profile. With a higher index of velocity, the velocity profile decreases and the temperature field elevates. It has been found that the presence of quadratic convection improves the temperature field. The outcomes of the two models are compared. The Yamada-Ota model performed far better than the Xue model in the heat transfer analysis.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 6","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review on the deformation tracking methods in vision-based tactile sensing technology 基于视觉的触觉传感技术中变形跟踪方法研究进展

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-10-24 DOI: 10.1007/s10409-024-24436-x

Benzhu Guo (, ), Shengyu Duan (, ), Panding Wang (, ), Hongshuai Lei (, ), Zeang Zhao (, ), Daining Fang (, )

{"title":"A review on the deformation tracking methods in vision-based tactile sensing technology","authors":"Benzhu Guo \u0000 (, ), Shengyu Duan \u0000 (, ), Panding Wang \u0000 (, ), Hongshuai Lei \u0000 (, ), Zeang Zhao \u0000 (, ), Daining Fang \u0000 (, )","doi":"10.1007/s10409-024-24436-x","DOIUrl":"10.1007/s10409-024-24436-x","url":null,"abstract":"<div><p>In daily life, human need various senses to obtain information about their surroundings, and touch is one of the five major human sensing signals. Similarly, it is extremely important for robots to be endowed with tactile sensing ability. In recent years, vision-based tactile sensing technology has been the research hotspot and frontier in the field of tactile perception. Compared to conventional tactile sensing technologies, vision-based tactile sensing technologies are capable of obtaining high-quality and high-resolution tactile information at a lower cost, while not being limited by the size and shape of sensors. Several previous articles have reviewed the sensing mechanism and electrical components of vision-based sensors, greatly promoting the innovation of tactile sensing. Different from existing reviews, this article concentrates on the underlying tracking method which converts real-time images into deformation information, including contact, sliding and friction. We will show the history and development of both model-based and model-free tracking methods, among which model-based approaches rely on schematic mechanical theories, and model-free approaches mainly involve machine learning algorithms. Comparing the efficiency and accuracy of existing deformation tracking methods, future research directions of vision-based tactile sensors for smart manipulations and robots are also discussed.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10409-024-24436-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of low-frequency vibration isolators with high-static-low-dynamic characteristic via functionally graded beam systems 基于功能梯度梁系统的高静低动特性低频隔振器设计

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-10-23 DOI: 10.1007/s10409-024-23501-x

Yixin Huang (, ), Yikun Yuan (, ), Yichen Jia (, ), Yang Zhao (, )

{"title":"Design of low-frequency vibration isolators with high-static-low-dynamic characteristic via functionally graded beam systems","authors":"Yixin Huang \u0000 (, ), Yikun Yuan \u0000 (, ), Yichen Jia \u0000 (, ), Yang Zhao \u0000 (, )","doi":"10.1007/s10409-024-23501-x","DOIUrl":"10.1007/s10409-024-23501-x","url":null,"abstract":"<div><p>This paper presents a novel and simple approach to designing low-frequency vibration isolators via functionally graded beam systems. Without complex mechanisms and nonlinear devices, high-static stiffness and wide anti-resonance frequency bands can be achieved by optimizing material gradients and auxiliary masses. The discrete equation governing the bending and vibration of the beam system is established by employing Timoshenko’s theory and a Chebyshev spectral method. The dynamic characteristics, steady-state frequency response, and bending under static loads, are numerically calculated and used to evaluate its vibration isolation performance and support stiffness. The effects of the material gradient and auxiliary masses on the force transmissibility and static stiffness were investigated. It was found that adjusting the auxiliary masses can change the position of anti-resonance peaks, and tailoring axial material gradient can broaden the anti-resonance frequency bands. Exploiting these effects and describing the axial material distribution by the Chebyshev expansions, the constrained particle swarm optimization algorithm is adopted to design two low-frequency vibration isolators, in order to demonstrate the feasibility of using functionally graded materials to isolate low-frequency vibration and maintain structural stiffness. The results show that near the operating frequency, the transmissibility decays more than 93%, more importantly, the static stiffness is larger than 190 kN/m. This work shows a promising approach to vibration isolator design, i.e., tailoring functionally graded materials to precisely manipulate structural dynamic responses.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0