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Design and characteristic research of a novel electromechanical-hydraulic hybrid actuator with two transmission mechanisms

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Frontiers of Mechanical Engineering 2023年第2期18卷 189-204页

作者： Shufei QIAO Long QUAN Yunxiao HAO Lei GE Lianpeng XIA Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China

Servo-hydraulic actuators(SHAs)are widely used in mechanical equipment to drive heavy-duty ***,their energy efficiency is low,and their motion characteristics are inevitably affected by uncertain *** actuators(EMAs)possess superior energy efficiency and motion ***,they cannot easily drive heavy-duty mechanisms because of weak bearing *** study proposes and designs a novel electromechanical-hydraulic hybrid actuator(EMHA)that integrates the advantages of EMA and *** mainly features two transmission *** piston of the hydraulic transmission mechanism and the ball screw pair of the electromechanical transmission mechanism are mechanically fixed together through screw bolts,realizing the integration of two types of transmission *** control scheme of the electromechanical transmission mechanism is used for motion control,and the hydraulic transmission mechanism is used for power ***,the mathematical model,structure,and parameter design of the new EMHA are ***,the EMHA prototype and test platform are *** test results prove that the EMHA has good working characteristics and high energy *** with the valve-controlled hydraulic cylinder system,EMHA exhibits a velocity tracking error and energy consumption reduced by 49.7% and 54%,respectively,under the same working conditions.

关键词： electromechanical-hydraulic hybrid actuator(EMHA) integration transmission mechanisms power assistance energy efficiency working characteristics

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Securing Mobile Robotic Networks Against Replacement Attack

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IEEE Transactions on Automatic control 2025年

作者： Li, Yushan He, Jianping Chen, Cailian Guan, Xinping Cai, Lin Shanghai Jiao Tong University Dept. of Automation China Ministry of Education of China The Key Laboratory of System Control and Information Processing China Shanghai Engineering Research Center of Intelligent Control and Management Shanghai200240 China University of Victoria Dept. of Electrical and Computer Engineering BC Canada

The security of mobile robotic networks (MRNs) has been an active research topic in recent years. This paper aims to secure the ubiquitous formation control of MRNs against the replacement attack, where an external robot can replace a formation robot by compromising the communication and physically interfering with the victim simultaneously. To counter this advanced attack, the novel idea of this work is to leverage the physical proximity of the formation shape and the interaction topology among robots for defense design. First, from the physical proximity perspective, we propose the convex neighbor polygon (CNP) to capture the geometric characteristic of the formation robots, and design a CNP-based security mechanism for the robots during the replacement attack. Then, from the interaction perspective, we introduce the indirect controllability to characterize the possibility that the attacker leverages the interaction between robots to deactivate the CNP mechanism, and establish the conditions regarding the topology structure and the attack input to counter the replacement. Finally, based on the obtained conditions, we demonstrate how to design the initiatory topology among the formation robots to enhance the defense performance. Comparative simulations verify the effectiveness of the proposed method. © 1963-2012 IEEE.

关键词： Topology

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A zero-fault sample diesel engine early warning and localisation method based on multi-cylinder similarity and memory augmentation

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Expert systems with Applications 2025年 284卷

作者： Mo, Hangfeng Ji, Shude Chen, Shenxiao Wang, Zijia Jiang, Zhinong Mao, Zhiwei Key Laboratory of Engine Health Monitoring-Control and Networking Ministry of Education Beijing University of Chemical Technology Beijing100029 China State Key Laboratory of High-end Compressor and System Technology Beijing University of Chemical Technology Beijing100029 China Tianjin300400 China State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing10084 China

Diesel engines often present challenges in achieving efficient warning and accurate localisation during actual operation due to complex working conditions and the lack of fault samples. To address this issue, this paper proposes a zero-fault sample anomaly warning and localisation method for diesel engines, which is based on multi-cylinder similarity and memory augmented autoencoder. This approach allows for model training without the use of fault samples, a method that has been scarcely explored in industrial research concerning diesel engine fault diagnosis using only normal samples. The method leverages the similarities in operating states among multiple cylinders and constructs a joint similarity matrix by integrating waveform similarity and impact energy similarity. This approach captures the intrinsic correlation characteristics among the cylinders and effectively mitigates the influence of changes in operating conditions on diagnostic performance. Additionally, a memory augmentation autoencoder is employed to model normal samples. By amplifying the reconstruction error of abnormal data, the method facilitates fault warning and localisation even in the absence of fault samples. Experimental results demonstrate that the proposed method can successfully achieve early fault warning and localisation under both single and cross-operating conditions without requiring fault samples, thereby providing an effective solution for early fault detection and intelligent maintenance of diesel engines. © 2025 Elsevier Ltd

关键词： Industrial research

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A Review of Machine Tool Motorized Spindle Variable Pressure Preload Technology Research

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Recent Patents on Engineering 2025年第5期19卷

作者： Dai, Ye Deng, Hao Pan, Gaofeng Chen, Xinda Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education School of Mechanical and Power Engineering Harbin University of Science and Technology Harbin150080 China School of College of Measurement and Control Technology and Communication Engineering Harbin University of Science and Technology Harbin150080 China

High-precision spindles are a vital study topic because of the growing demand for high-speed, high-precision, reliable, and long-lasting machine tools. Bearing preload is the primary means of improving the accuracy of the spindle rotor system. This patent study aims to summarize the research results, systematically analyze and evaluate the machine tool motorized spindle variable pressure preload technology, and provide a scientific basis for the practical application of the motor spindle variable pressure preload technology. This study is an in-depth analysis of the basic principles of the electric spindle preloading technology, the study of its influence mechanism on the thermal deformation, stiffness, slewing error, and life of the spindle system, and a discussion of the current shortcomings in the field of spindle preloading to provide a reference for the subsequent optimization. In the spindle system, the performance of rolling bearings and the design of bearing preload have an important impact on the spindle's accuracy and stability. The traditional preload method has yet to meet the requirements of modern high-speed machine tools. Real-time controllable preload has become the new direction of development, but the current preload technology still has certain limitations and needs to be further improved. In the future, the spindle bearing variable pressure preload technology will be more efficient and intelligent. © 2025 Bentham Science Publishers.

关键词： Machine tools

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Zero-Magnetic-Field Oscillation of Spin Transfer Nano-Oscillator with a Second-Order-Perpendicular-Anisotropy Free Layer

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Chinese Physics Letters 2016年第3期33卷 107-110页

作者：郭园园赵飞飞薛海斌刘喆颉 Key Laboratory of Advanced Transducers & Intelligent Control System(Ministry of Education) Taiyuan University of Technology College of Physics & Optoelectronics Taiyuan University of Technology

The zero-magnetic-field oscillation behavior of spin torque nano-oscillator （STNO） with a perpendicularly mag- netized free layer with second-order uniaxial anisotropy is studied theoretically based on the Landau-Lifshitz- Cilbert-Slonczewski equation. It is demonstrated numerically that the second-order uniaxial anisotropy plays a significant role in the occurrence of a zero-magnetic-field steady-state precession, which can be understood in terms of the energy balance between the energy accumulation due to the spin torque and the energy dissipation due to the Gilbert damping. In particular, a relatively large zero-magnetic-field-oscillation current region, in which the corresponding microwave frequency is increased while the threshold current still maintains an almost constant value, can be obtained by modulating the second-order uniaxial anisotropy of the free layer. These results suggest a tunable zero-magnetic-field STNO, and it may be a promising configuration for STNO＇s applications in future wireless communications.

关键词： of on in is it as Zero-Magnetic-Field Oscillation of Spin Transfer Nano-Oscillator with a Second-Order-Perpendicular-Anisotropy Free Layer with

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CS/Gel/MWCNTs Conductive Scaffolds Assisted by Electrical Stimulus for Skin Tissue Engineering

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Biotechnology and Bioengineering 2025年 2025 May 15页

作者： Liu, Zixian Ma, Zijun Li, Nini Zhang, Jinyao Li, Meng Han, Lu Cheng, Rong Shen, Zhizhong Han, Dan Sang, Shengbo Shanxi Key Laboratory of Artificial Intelligence & Micro Nano Sensors College of Integrated Circuits Taiyuan University of Technology Shanxi Province Taiyuan China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of Technology Shanxi Province Taiyuan China College of chemistry and chemical Engineering North University of china Shanxi Province Taiyuan China Shanxi Research Institute of 6D Artificial Intelligence Biomedical Science Shanxi Province Taiyuan China

Hydrogel scaffolds show high potential in tissue engineering due to excellent mechanical properties and biocompatibility. However, an inherent lack of conductivity limits its application in areas requiring electrical stimulation. To address this issue, chitosan (CS)/gelatin (Gel) scaffolds were prepared with various concentrations of multi-walled carbon nanotubes (MWCNTs). Results indicated that MWCNT incorporation significantly improved both the electrical conductivity and mechanical strength of the scaffolds, with the CS/Gel/0.3% MWCNTs scaffold demonstrating superior biocompatibility compared to other formulations. Additionally, fibroblasts seeded onto the scaffolds responded positively to electrical stimulation, showing increased proliferation and elevated expression of type I and type III collagen. These findings highlight the potential of CS/Gel/MWCNTs scaffolds to enhance wound healing in skin tissue engineering. © 2025 Wiley Periodicals LLC.

关键词： Fiber bonding

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New Method to Improve Dynamic Stiffness of Electro-hydraulic Servo systems

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Chinese Journal of Mechanical Engineering 2013年第5期26卷 997-1005页

作者： BAI Yanhong QUAN Long Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology School of Electronics Information Engineering Taiyuan University of Science and Technology

Most current researches working on improving stiffness focus on the application of control *** controller in closed-loop hydraulic control system takes effect only after the controlled position is deviated,so the control action is *** dynamic performance against force disturbance and dynamic load stiffness can’t be improved evidently by advanced control *** this paper,the elementary principle of maintaining piston position unchanged under sudden external force load change by charging additional oil is *** this basis,the conception of raising dynamic stiffness of electro hydraulic position servo system by flow feedforward compensation is put *** a scheme using double servo valves to realize flow feedforward compensation is presented,in which another fast response servo valve is added to the regular electro hydraulic servo system and specially utilized to compensate the compressed oil volume caused by load impact in *** two valves are arranged in parallel to control the cylinder ***,the model of flow compensation is derived,by which the product of the amplitude and width of the valve’s pulse command signal can be *** determination rules of the amplitude and width of pulse signal are concluded by analysis and *** the proposed scheme,simulations and experiments at different positions with different force changes are *** simulation and experimental results show that the system dynamic performance against load force impact is largely improved with decreased maximal dynamic position deviation and shortened settling *** is,system dynamic load stiffness is evidently *** paper proposes a new method which can effectively improve the dynamic stiffness of electro-hydraulic servo systems.

关键词： electro-hydraulic servo system flow feedforward compensation dynamic load stiffness double-valve actuation

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Dielectric Nanocavity Enhanced Fluorescence Emission for Ultrasensitive Wavelength-Multiplexed Detection

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Nano Letters 2025年 2025 May 20页

作者： Fu, Bowen Yuan, Zhiyi Fang, Guocheng Wang, Wen-Jie Xiong, Zhongshu Chen, Yu-Cheng School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore Institute for Digital Molecular Analytics and Science (IDMxS) Nanyang Technological University 59 Nanyang Drive Singapore 636921 Singapore Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

This study demonstrates a novel biosensing platform utilizing a dielectric nanocavity to enhance fluorescence emission for the ultrasensitive detection of biomolecules. By coupling a silver (Ag) nanocube with a distributed Bragg reflector (DBR) mirror, we achieved a substantial fluorescence enhancement reaching a maximum enhancement factor of up to 855-fold and having quasi-single molecule sensitivity. The platform was successfully applied for multiplexed detection of four different miRNA biomarkers, showcasing its ability to detect multiple targets simultaneously with high sensitivity. The simplicity, rapid speed, and small detection volume (down to 0.5 μL) of this system make it suitable for high-throughput and large-area nanocavity imaging. Our findings offer a promising solution for ultrasensitive, multiplexed biosensing with potential applications in disease diagnosis, personalized medicine, and digital molecular diagnostics. © 2025 American Chemical Society.

关键词： dielectric-coupled nanocavity fluorescence enhancement high-throughput biosensing multiplexed detection nanoparticle quasi-single molecule level detection

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Distributed Generalized Nash Equilibria Learning for Online Stochastic Aggregative Games

arXiv

引用

arXiv 2025年

作者： Du, Kaixin Meng, Min Shanghai Research Institute for Intelligent Autonomous Systems Tongji University Shanghai200092 China Department of Control Science and Engineering College of Electronics and Information Engineering National Key Laboratory of Autonomous Intelligent Unmanned System Frontiers Science Center for Intelligent Autonomous Systems Ministry of Education Shanghai Research Institute for Intelligent Autonomous Systems Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai China

This paper investigates online stochastic aggregative games subject to local set constraints and time-varying coupled inequality constraints, where each player possesses a time-varying expectation-valued cost function relying on not only its own decision variable but also an aggregation of all the players’ variables. Each player can only access its local individual cost function and constraints, necessitating partial information exchanges with neighboring players through time-varying unbalanced networks. Additionally, local cost functions and constraint functions are not prior knowledge and only revealed gradually. To learn generalized Nash equilibria of such games, a novel distributed online stochastic algorithm is devised based on push-sum and primal-dual strategies. Through rigorous analysis, high probability bounds on the regret and constraint violation are provided by appropriately selecting decreasing stepsizes. Moreover, for a time-invariant stochastic strongly monotone game, it is shown that the generated sequence by the designed algorithm converges to its variational generalized Nash equilibrium (GNE) almost surely, and the time-averaged sequence converges sublinearly with high probability. Finally, the derived theoretical results are illustrated by numerical simulations. Copyright © 2025, The Authors. All rights reserved.

关键词： Nash equilibrium

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Flexible pulses from carbon nanotubes mode-locked fiber laser

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Chinese Physics B 2016年第12期25卷 258-261页

作者：杨玲珍杨义王娟芬 College of Physics and Optoelectronics Taiyuan University of Technology Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of Technology

We demonstrate a flexible erbium-doped pulsed fiber laser which achieves the wavelength and pulse width tuning by adjusting an intracavity filter. The intracavity filter is flexible to achieve any of the different wavelengths and bandwidths in the tuning range. The wavelength and width of pulse can be tuned in a range of - 20 nm and from - 0.8 ps to 87 ps, respectively. The flexible pulsed fiber laser can be accurately controlled, which is insensitive to environmental disturbance.

关键词： fiber laser mode-locked laser wavelength and pulse width tunable carbon nanotubes

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