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Molecular transport under extreme confinement

science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 1-10页

作者： FengChao Wang JianHao Qian JingCun Fan JinChuan Li HengYu Xu HengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China

Mass transport through the nanoporous medium is ubiquitous in nature and *** the macroscale transport phenomena which have been well understood by the theory of continuum mechanics,the relevant physics and mechanics on the nanoscale transport still remain *** developments in fabrication of slit-like nanocapillaries with precise dimensions and atomically smooth surfaces have promoted the fundamental research on the molecular transport under extreme *** this review,we summarized the contemporary progress in the study of confined molecular transport of water,ions and gases,based on both experiments and molecular dynamics *** liquid exhibits a pronounced layered structure that extends over several intermolecular distances from the solid surface,which has a substantial influence on static properties and transport behaviors under *** studies have also shown that those molecular details could provide some new understanding on the century-old classical theory in this field.

关键词： confined mass transport nanocapillary solid-liquid interface confinement effect

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Analysis of Factors Affecting Response Time of Magnetorheological Damper and Its Optimal Design 2nd

Analysis of Factors Affecting Response Time of Magnetorheolo...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Yan, Zhengwei Jiang, Min Zhu, Wei Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Complex Multibody System Dynamics Nanjing210094 China

ISBN: (纸本)9789819980475

As a typical semi-active damping device, the response time of magnetorheological damper has a great influence on the working performance. In this paper, the factors affecting its magnetic field response were analyzed. Firstly, the effect of the dual-coil arrangement on the response time was analyzed, and the results showed that the response is faster when the current is reversed than when it is in the same direction;secondly, the magnetic parameters of different materials were tested with a soft magnetic DC meter, and the response times of different materials are derived;then, the effect of the structural parameters of the magnetic path on the response time was analyzed, and it was concluded that the response time grows with the rise of the channel gap and the yoke thickness, and the decrease of the pole length;Finally, the fastest response time and the largest adjustable multiplier are taken as the optimization objectives to obtain the Pareto set, which is then verified by the magnetic path simulation. The results showed that the reasonable design of coil, material and magnetic path structure parameters can effectively reduce the response time of the damper and significantly improve its performance. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Deflection yokes

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Research on Multi-radar Anti-jamming Strategy Allocation Method Under Small Risk Based on Game Theory 7th

Research on Multi-radar Anti-jamming Strategy Allocation Met...

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7th Chinese Conference on Swarm Intelligence and Cooperative Control, CCSICC 2023

作者： Li, Wen Pei, Hu-Cheng Qu, Guang-Zhou Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China Beijing Electro-Mechanical Engineering Institute Beijing100074 China

ISBN: (纸本)9789819733354

In order to counteract the impact of passive jamming in unmanned airborne radar for search and attack missions against ships at sea, and to enhance the overall striking effectiveness at the UAV swarm level, a method is proposed to take the jamming scenario formed by the release of jamming from the ship as its set of game strategies, so as to construct a static zero-sum game model of the ship and UAV swarm, and then to take the mixed-strategy Nash equilibrium solution of the game as the method for the allocation of multi-radar anti-jamming strategies in the UAV swarm, and further gives a calculation method of the mixed-strategy Nash equilibrium solution of the game in the presence of risk by establishing the fitness evaluation function, compared with the Nash equilibrium solution of the game under no risk, the solution obtained by this method can enhance the expected benefit of the UAV swarm and better meet the actual tactical needs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Unmanned aerial vehicles (UAV)

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Vibration Control of Magnetorheological Suspension systems for Vehicles 2nd

Vibration Control of Magnetorheological Suspension Systems f...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhu, Wei Jiang, Yuxin Zhong, Shenyu Jiang, Min Rui, Xiaoting Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Complex Multibody System Dynamics Nanjing210094 China

ISBN: (纸本)9789819980475

Magnetorheological dampers have the advantages of fast response, low energy consumption and large controllable damping force, and are widely used in structural and vehicle vibration control, but the hysteresis characteristics between their damping force–velocity-current lead to degraded or even unstable vibration control performance. In order to improve the control accuracy of the damping force of the magnetorheological damper, we established the Bingham model to describe the hysteresis characteristics of the magnetorheological damper, and proposed a tracking control method for the magnetorheological damper damping force based on the Bingham model. In order to improve the vibration control performance, and a vibration control method with magnetorheological damper hysteresis force tracking control is proposed. In order to experimentally verify the effectiveness of the control method, a magnetorheological semi-active suspension control system for wheeled vehicles is established. The driving and shock experimental results show that the method established in this paper can effectively reduce the root mean square value of vibration acceleration and shock response by more than 20% and improve the vehicle ride comfort. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Vibration control

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Active Disturbance Rejection Gain Scheduling Control of Hypersonic Vehicle Based on Guardian Maps 13

Active Disturbance Rejection Gain Scheduling Control of Hype...

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13th IEEE Data Driven Control and Learning systems Conference, DDCLS 2024

作者： Zhang, Tingyu Wang, Yongshuai Sun, Mingwei Hao, Mingrui Chen, Zengqiang College of Artificial Intelligence Nankai University Tianjin300350 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China

ISBN: (纸本)9798350361674

This paper presented an adaptive gain scheduling algorithm for hypersonic vehicles with wide envelopes. First, the linear parameter variable parameter (LPV) model of hypersonic vehicles is established in the flight envelope. Then, the active disturbance rejection controller is considered to cope with disturbances and uncertainties, and the control gain is scheduled using the guardian maps method to adapt to the wide envelope of velocity and height. Finally, numerical simulation results show good control performance and meet the required performance indexes in all operating conditions, demonstrating the effectiveness and robustness of the proposed method. © 2024 IEEE.

关键词： Disturbance rejection

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LQR Control Method for Vehicle Magnetorheological Suspension 2nd

LQR Control Method for Vehicle Magnetorheological Suspension

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Jiang, Yuxin Zhu, Wei Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Complex Multibody System Dynamics Nanjing210094 China

ISBN: (纸本)9789819980475

Vehicle suspension is a transmission device that connects the wheels and the body, and it plays an important role in road damage, ride comfort, vehicle safety and stability and overall performances of the vehicle. The semi active suspension using magnetorheological dampers has the characteristics of simple structure, low power consumption, high reliability, and has broad application prospects in the field of vehicle suspension. The traditional skyhook controller was based on 2-DOF quarter vehicle suspension, and ignored to suppress pitch motion and roll motion of the vehicle. In order to accurately describe the vibration of the vehicle, a 7-DOF vehicle suspension dynamic model is introduced. The dynamic model mainly describes the vertical vibration, pitch motion, and roll motion of the vehicle. Based on the model, a linear quadratic regulator (LQR) is introduced. The simulation result shows that the LQR controller effectively decreases the vibration both on the vertical axis, pitch axis and roll axis. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Linear control systems

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Ship Size Attribute Reconstruction Method Based on Multi-aircraft Collaborative Detection 7th

Ship Size Attribute Reconstruction Method Based on Multi-air...

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7th Chinese Conference on Swarm Intelligence and Cooperative Control, CCSICC 2023

作者： Xiaozu, Li Qingxi, Chi Peng, Jiang Mengmeng, Han Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China Beijing Electro-Mechanical Engineering Institute Beijing100074 China

ISBN: (纸本)9789819733316

For mixed-ship scenarios, traditional aircraft have limited ability to extract ship features due to the constraints of observation angles, making it difficult to effectively select the high-value ship targets. In this paper, a ship length and width reconstruction method adaptable to multi-aircraft cooperative detection is proposed, taking dual-aircraft radar cooperative detection as the research object. Under the premise of known heading, a ship size reconstruction model is established by combining the radial size information from different observation directions. Finally, the performance of the model under different detection conditions is analyzed. Simulation verification shows that the maximum length reconstruction error does not exceed 7.56% of the true length of the target, which can effectively restore the target size information and provide necessary support for effectively solving the problem of the high-value ship targets selection in mixed scenes. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Ships

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Reduced Multibody system Transfer Matrix Method for Ship system Vibration Modeling 2nd

Reduced Multibody System Transfer Matrix Method for Ship Sys...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Rui, Xue He, Bin Wang, Xun Hao, Feiyu Chen, Yiheng Wang, Jinghong Cao, Hanchen Hou, Yibing Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Complex Multibody System Dynamics Nanjing210094 China

ISBN: (纸本)9789819980475

The vibration performance of a ship such as maneuverability, comfort and reliability depends on the advanced dynamics design ability of ship system. A ship can be considered as a multi-rigid-flexible-body system composed of a large number of rigid bodies and flexible bodies. Its dynamics design ability is reliant on the advanced ship system dynamic theory. As a rather novel dynamics method for multibody systems, the Multibody system Transfer Matrix Method (MSTMM) has been developed in the past 30 years. Compared with ordinary dynamics methods, it has the advantages of low order of system matrix and independence of system degrees of freedom (DOF), fast computational speed and high programmability. It has been widely used to solve more than 150 engineering problems around the world. In particular, the Reduced Multibody system Transfer Matrix Method (RMSTMM) not only retains all the advantages of MSTMM, but also benefits from the high computational stability. In this paper, the multi-rigid-flexible-body system dynamics model of the ship system including a propeller subsystem, rotating shaft-hull subsystems, bearing seat subsystems, shaft-coupling subsystems and motor subsystem, and transfer equations as well as reduced transfer equations with recursive forms for the ship system and its elements, such as, rotating Timoshenko beam, rotating rigid cylinder, are developed for the first time by utilizing the RMSTMM. Consequently, the efficient modeling and simulation of the ship system dynamics and eigenfrequency are achieved. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Transfer matrix method

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A Scene Matching Backtracking Location Method Based on Convergence Criterion 11th

A Scene Matching Backtracking Location Method Based on Conve...

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11th China Conference on Command and Control, C2 2023

作者： Peng, Siting Jun, Ren lei, Li Ma, Yichao Yang, Yanjiao Beijing Electro-Mechanical Engineering Institute Beijing100074 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China

ISBN: (纸本)9789819990207

In this paper, the engineering problems in scene matching positioning system are studied, according to the scene matching positioning of satellite under the condition of denial, establish a volume of physical model, kalman filtering method of indirect filtering residual envelope method is adopted to improve the mismatching points out and jumping back and forth, filtering results using backtracking method to solve the problem of less The precise positioning of the aircraft's own position under the condition of satellite rejection is realized, so as to achieve accurate guidance and strike to the target. The simulation results show that the method described in this paper is effective and has good academic and engineering significance. © Chinese Institute of Command and Control 2024.

关键词： Kalman filters

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Dynamic response of the cell traction force to osmotic shock

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Microsystems & Nanoengineering 2023年第5期9卷 321-331页

作者： Yongman Liu Wenjie Wu Shuo Feng Ye Chen Xiaoping Wu Qingchuan Zhang Shangquan Wu School of Biomedical Engineering Anhui Medical University230032 HefeiChina CAS Key Laboratory of Mechanical Behavior and Design of Material Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of China230026 HefeiChina

Osmotic pressure is vital to many physiological activities,such as cell proliferation,wound healing and disease ***,how cells interact with the extracellular matrix(ECM)when subjected to osmotic shock remains ***,we visualize the mechanical interactions between cells and the ECM during osmotic shock by quantifying the dynamic evolution of the cell traction *** show that both hypertonic and hypotonic shocks induce continuous and large changes in cell traction ***,the traction force varies with cell volume:the traction force increases as cells shrink and decreases as cells ***,the direction of the traction force is independent of cell volume changes and is always toward the center of the cell-substrate ***,we reveal a mechanical mechanism in which the change in cortical tension caused by osmotic shock leads to the variation in traction force,which suggests a simple method for measuring changes in cell cortical *** findings provide new insights into the mechanical force response of cells to the external environment and may provide a deeper understanding of how the ECM regulates cell structure and function.

关键词： traction healing wound

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