Acta Mechanica Sinica最新文献_第8页

Contact between deformed rough surfaces 变形粗糙表面之间的接触

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24905-x

Liao-Liang Ke

引用次数: 0

Experimental study on unsteady flow of hydraulic conveying of a single coarse particle through a 90° bend 单粒粗颗粒90°弯道水力输送不稳定流动试验研究

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24339-x

Hui Cheng (, ), Hong Xiong (, ), Yuxiang Chen (, ), Hong Zhu (, ), Chunliang Yu (, ), Guodong Zheng (, ), Yiyang Xing (, )

{"title":"Experimental study on unsteady flow of hydraulic conveying of a single coarse particle through a 90° bend","authors":"Hui Cheng \u0000 (, ), Hong Xiong \u0000 (, ), Yuxiang Chen \u0000 (, ), Hong Zhu \u0000 (, ), Chunliang Yu \u0000 (, ), Guodong Zheng \u0000 (, ), Yiyang Xing \u0000 (, )","doi":"10.1007/s10409-024-24339-x","DOIUrl":"10.1007/s10409-024-24339-x","url":null,"abstract":"<div><p>Bends contribute to a flexible layout of pipeline system, but also lead to intensive energy costs due to the complex flow characteristic. This experimental study is conducted to investigate the impact of a single coarse particle on the flow field in a bend. The velocity profiles of fluid on the axial symmetry plane of the bend are measured using time-resolved particle image velocimetry. The flow structures are extracted using the proper orthogonal decomposition method. The results reveal that there is a shear-layer flow in the bend during the transportation. With the increase in particle size, the particle has a dominant influence on the flow energy distribution of the overall flow. The impact of particles on the first few energetic flows is mainly in the latter part of the transportation, both temporally and spatially. As the particle size decreases, the most energetic unsteady flow within the bend changes from the convective flow to the flow of the shear layer.\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":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889823","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

Buckling and post-buckling behavior of ideal and non-ideal FG-GPLRC beams in thermal environment 理想和非理想FG-GPLRC梁在热环境下的屈曲和后屈曲行为

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24374-x

Wachirawit Songsuwan, Son Thai, Nuttawit Wattanasakulpong

{"title":"Buckling and post-buckling behavior of ideal and non-ideal FG-GPLRC beams in thermal environment","authors":"Wachirawit Songsuwan, Son Thai, Nuttawit Wattanasakulpong","doi":"10.1007/s10409-024-24374-x","DOIUrl":"10.1007/s10409-024-24374-x","url":null,"abstract":"<div><p>This investigation aims to analyze thermal buckling and post-buckling behavior of functionally graded graphene nanoplatelet-reinforced composite (FG-GPLRC) beams. The beams are classified into two types of ideal and non-ideal FG-GPLRC beams in which the ideal beams have smooth profiles of material distributions and another beams have layer-wise distributions of materials. The material profiles of the ideal beams are utilized as the controlling tracks for producing the material distributions of the non-ideal beams via a layer-to-layer integration technique. This technique confirms that the overall weight fraction of the materials is the same for both types of beams. The proposed models can be used to determine the material properties of the beams for further investigation on thermal buckling and post-buckling of the beams. Third-order shear deformation theory is employed to construct the energy equations of the problems, and then they are solved by the implementation of the Jacobi-Ritz method cooperating with the direct iteration procedure and Newton-Raphson technique. From our investigation, it can be disclosed that when non-ideal beams are created using ideal beams parabolic profile, the results differ significantly. However, the differences between the results of ideal and non-ideal beams can be eliminated by adding more layers.\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 9","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889824","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

On the windward boundary layer transition over a hypersonic blunt cone with global stability analyses and experiments 高超声速钝锥迎风边界层转捩的全局稳定性分析与实验

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2024-11-20 DOI: 10.1007/s10409-024-24150-x

Kuo Chen (, ), Xiaohu Li (, ), Guohua Tu (, ), Bingbing Wan (, ), Bin Zhang (, ), Jianqiang Chen (, ), Jiufen Chen (, )

{"title":"On the windward boundary layer transition over a hypersonic blunt cone with global stability analyses and experiments","authors":"Kuo Chen \u0000 (, ), Xiaohu Li \u0000 (, ), Guohua Tu \u0000 (, ), Bingbing Wan \u0000 (, ), Bin Zhang \u0000 (, ), Jianqiang Chen \u0000 (, ), Jiufen Chen \u0000 (, )","doi":"10.1007/s10409-024-24150-x","DOIUrl":"10.1007/s10409-024-24150-x","url":null,"abstract":"<div><p>This paper investigates the effect of the angle-of-attack (AOA) on the windward boundary-layer stability over a blunt cone with a nose radius of 5 mm. We consider a free-stream Mach number of 6 and a unit Reynolds number of 4.0 × 10<sup>7</sup> m<sup>−1</sup> and conduct both wind-tunnel experiments and stability analyses for AOAs ranging from 2°–10° at intervals of 2°. The results suggest that, as the AOA increases, the pressure gradient across the spanwise range becomes more pronounced, and the windward-side boundary layer becomes thinner. Using bi-global stability analysis, two unstable three-dimensional modes (varicose and sinuous) are identified in the windward boundary layer at various AOAs. The most unstable mode is the varicose V1 mode, in which the amplitude peak is initially close to the windward centerline and gradually shifts to the centerline downstream. Hence, the primary unstable disturbance exhibits a “V-like” distribution along the streamwise direction, which is likely to cause the V-shaped transition front observed in the wind-tunnel experiments. The eN method based on bi-global analysis is used to predict the transition location along the centerline on the windward region of the cone. The results indicate that, as the AOA increases, the transition location shifts forward, in line with our experimental results. Moreover, linear stability theory accurately predicts the eigenfunction and growth rate of the V1 mode obtained from bi-global analysis. This indicates that linear stability theory can be used to predict transitions in the windward boundary layer of a blunt cone at large AOAs under the conditions studied in this paper.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142941100","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

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