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32nd International Conference on Vibroengineering

作者： Cheng, Shouguo School of Mechatronics Engineering and Automation Shanghai University Shanghai China Department of Mechanical and Electrical Engineering Jiangyin Polytechnic College Jiangyin China

Due to the relative movement between the crosshead and the guide of reciprocating compressor, there must be friction, wear and movement clearance between them. When the clearance reaches a certain value, the performance of the reciprocating compressor is seriously affected, and the safety of the equipment and operator is threatened. In this paper, the interaction relationship between the crosshead and the guide is established through the contact collision function, and the influence of the wear amount of the crosshead and the rotational speed of the crankshaft on the reciprocating compressor with the clearance is studied. The nonlinear characteristics of the system are analyzed by phase diagram and Lyapunov exponent. The results show that the crosshead motion of reciprocating compressor with a translational clearance is chaotic. © 2018 Shouguo Cheng.

关键词： Lyapunov functions

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Particle Swarm Optimization based Optimization for Batch Processes

Particle Swarm Optimization based Optimization for Batch Pro...

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Chinese automation Congress (CAC)

作者： Yanan Zhang Li Jia Department of Automation Shanghai University Shanghai P.R.China Shanghai Key Laboratory of Power Station Automation Technology College of Mechatronics Engineering and Automation Shanghai University Shanghai P.R.China

Considering trajectory optimization and local extremum problems, a 2D batch process optimization method with initial state optimization is proposed in this paper. It integrates the information of time axis and batch axis unique to batch process. Particle swarm optimization (PSO), which is used to optimize the initial value so that it has good tracking performance and the ability to avoid falling into local optimum. At the same time, model identification and dynamic R parameter compensation are used to compensate the mismatch between the model and the controlled object, so that it has zero error tracking ability. By solving MPC optimization problem with time-varying predictive horizon, the control law is obtained, which has good tracking performance and robustness against disturbance and uncertainty. In addition, model identification and dynamic R parameters are used to compensate model mismatch, which makes zero error tracking possible. Secondly, the convergence analysis and tracking performance of the proposed integrated model predictive learning control system are strictly proved. Finally, the effectiveness of this method is verified by simulation.

关键词： Particle swarm optimization Batch production systems Two dimensional displays Optimization automation Convergence Computational modeling

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Active disturbance rejection based robust trajectory tracking controller design in state space

arXiv

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arXiv 2019年

作者： Sariyildiz, Emre Mutlu, Rahim Zhang, Chuanlin School of Mechanical Materials Mechatronics and Biomedical Engineering University of Wollongong NSW2522 Australia College of Automation Engineering Shanghai University of Electric Power Shanghai200090 China

This paper proposes a new Active Disturbance Rejection (ADR) based robust trajectory tracking controller design method in state space. It can compensate not only matched but also mismatched disturbances. Robust state and control input references are generated in terms of a fictitious design variable, namely differentially flat output, and the estimations of disturbances by using Differential Flatness (DF) and Disturbance Observer (DOb). Two different robust controller design techniques are proposed by using Brunovsky canonical form and polynomial matrix form approaches. The robust position control problem of a two mass-spring-damper system is studied to verify the proposed ADR controllers. Copyright © 2019, The Authors. All rights reserved.

关键词： Controllers

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A high-fidelity memory scheme for quantum data buses

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Chinese Physics B 2017年第9期26卷 48-55页

作者：刘博阳崔巍戴宏毅陈希张明 College of Mechatronics and Automation National University of Defense Technology School of Automation Science and Engineering South China University of Technology College of Science National University of Defense Technology College of Mechatronics and Automation National University of Defense Technology

A novel quantum memory scheme is proposed for quantum data buses in scalable quantum computers by using adjustable interaction. Our investigation focuses on a hybrid quantum system including coupled flux qubits and a nitrogen–vacancy center ensemble. In our scheme, the transmission and storage（retrieval） of quantum state are performed in two separated steps, which can be controlled by adjusting the coupling strength between the computing unit and the quantum memory. The scheme can be used not only to reduce the time of quantum state transmission, but also to increase the robustness of the system with respect to detuning caused by magnetic noises. In comparison with the previous memory scheme, about 80% of the transmission time is saved. Moreover, it is exemplified that in our scheme the fidelity could achieve 0.99 even when there exists detuning, while the one in the previous scheme is 0.75.

关键词： quantum memory hybrid quantum system quantum data bus

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A super resolution reconstruction algorithm based on spatial autoregression regularization

A super resolution reconstruction algorithm based on spatial...

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International Conference on Display Technology, ICDT 2018

作者： Shen, Huaming Xu, Meihua Ran, Feng Li, Liming College of Mechatronics Engineering and Automation Shanghai University Shanghai China Microelectronic R&D Center Shanghai University Shanghai China

ISBN: (纸本)9781510867659

In a lot of micro display applications, we need to enlarge and recognize a region of interest (ROI), which often get a low-resolution image because of limited resolution source image. This paper proposed a novel image reconstruction algorithm based on spatial autoregression regularization and sparse representation. This reconstruction algorithm trained an image dictionary with the same sparse coefficient by sparse K-SVD, and then import the autoregressive regularization item to construct the objective function which can realize local adaptive control of the image. In order to obtain further clear image, the degradation model was used which can realize the global constraints. The experimental results show that the proposed algorithm has considerable effectiveness in terms of both objective measurements and visual evaluation. © 2018 SID.

关键词： Image reconstruction

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Modeling and Analysis of Mechanical Quality Factor of the Resonator for Cylinder Vibratory Gyroscope

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Chinese Journal of Mechanical engineering 2017年第1期30卷 180-189页

作者： XI Xiang WU Xuezhong WU Yulie ZHANG Yongmeng College of Mechatronics Engineering and Automation National University of Defense TechnologyChangsha 410073China

Mechanical Quality factor（Q factor） of the resonator is an important parameter for the cylinder vibratory gyroscope（CVG）. Traditional analytical methods mainly focus on a partial energy loss during the vibration process of the CVG resonator, thus are not accurate for the mechanical Q factor prediction. Therefore an integrated model including air damping loss, surface defect loss, support loss, thermoelastic damping loss and internal friction loss is proposed to obtain the mechanical Q factor of the CVG resonator. Based on structural dynamics and energy dissipation analysis, the contribution of each energy loss to the total mechanical Q factor is quantificationally analyzed. For the resonator with radius ranging from 10 mm to 20 mm, its mechanical Q factor is mainly related to the support loss, thermoelastic damping loss and internal friction loss, which are fundamentally determined by the geometric sizes and material properties of the resonator. In addition, resonators made of alloy 3J53 （Ni42CrTiA1）, with different sizes, were experimentally fabricated to test the mechanical Q factor. The theoretical model is well verified by the experimental data, thus provides an effective theoretical method to design and predict the mechanical Q factor of the CVG resonator.

关键词： mechanical Quality factor cylinder vibratory gyroscope energy loss

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Control system design based on canopen network for a transformable multimodal robot 15

Control system design based on canopen network for a transfo...

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15th IEEE International Conference on mechatronics and automation, ICMA 2018

作者： Chang, Yukang Zhang, Zhiyong Wang, Chunlei College of Mechatronics Engineering and Automation National University of Defense Technology Changsha Hunan Province China PLA Jiuquan Gansu Province95972 China

ISBN: (纸本)9781538660720

This paper presents a control system designed and achieved for a transformable multimodal robot based on CANopen network. The control system architecture was designed according to the robot motion modal requirements and the CANopen protocol, and the robot hardware was built according to the architecture. The control flow of the control system based on CANopen protocol was analyzed. The differential steering algorithm was designed and the CAN-bus communication was analyzed. The user interface of host computer and the control software of slave computer were written by LabWindows/CVI. Moreover, experimental results have proved the reliability and validity of this control system. © 2018 IEEE.

关键词： Robots

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Influence of idler light on the shot-to-shot energy stability of third harmonic generation

Influence of idler light on the shot-to-shot energy stabilit...

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2018 Conference on Optoelectronic Devices and Integration, OEDI 2018, part of International Photonics and Optoelectronics Meeting, POEM 2018

作者： Liu, Jun Ouyang, Xiaoping Wei, Kun Peng, Bodong Tan, Xinjian Xu, Qing Sun, Bin College of Mechatronics Engineering and Automation National University of Defense Technology Changsha410073 China Northwest Institute of Nuclear Technology Xi'an710024 China

ISBN: (纸本)9781943580514

The energy stability of 266nm laser is a key factor for an electron accelerator. We report on the shot to shot energy stability of second and third harmonic generation (THG) by using sub-100-fs idler laser pulses. A maximum energy conversion as high as 25% from the fundamental to the third harmonic generation is achieved by phase and group velocity matching (Type I). The influence of energy and pulse duration of the idler wave has been studied. The THG stability varies from 0.135%~2.94% by changing the idler pulse energy in the experiments. © 2018 Optical Society of America.

关键词： Harmonic generation

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Calculation method for fractal characteristics of machining topography surface based on wavelet transform

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Procedia CIRP 2019年 79卷 500-504页

作者： Guoxi Li Kai Zhang Jingzhong Gong Xin Jin College of Mechatronics Engineering and Automation National University of Defense Technology No.109 Deya Street Changsha 410073 China School of Mechanical Engineering Hunan International Economics University No.822 Fenglin Street Changsha 410073 China

Fractal geometry is widely used to characterize machined surfaces and fractal dimension is the most important parameter. This work studies the wavelet-based method and its accuracy to extract fractal dimensions. Surface proﬁles are generated by Weierstrass-Mandelbrot (WM) function and prescribed wavelet coefficients (PWC) method. The orthonormal basis, vanishing moment and level of discrete wavelet transform are analyzed to calculate the proper fractal dimension. The standard reference surfaces are measured to verify the wavelet-based method.

关键词： Machined surfaces Fractal dimension Discrete wavelet transform Wavelet decomposition

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Dynamic analysis of the moving mechanism of the reciprocating compressor with clearance joints 33

Dynamic analysis of the moving mechanism of the reciprocatin...

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33rd International Conference on Vibroengineering

作者： Xiao, Qingfeng Liu, Shulin Nie, Ang Xiao, Shungen Cheng, Shouguo School of Mechatronics Engineering and Automation Shanghai University Shanghai China College of Information Mechanical and Electrical Engineering Ningde Normal University Ningde China Department of Mechanical and Electrical Engineering Jiangyin Polytechnic College Jiangsu China

The clearance faults on joint of moving mechanism are most common in a reciprocating compressor. In order to investigate the relationship between the clearance faults and the dynamic behavior of the moving mechanism, a dynamic model with clearances of a reciprocating compressor is built via software ADAMS. We take into the clearance size and clearance number into consideration and set clearance fault on the joint between the crank and connecting rod, the joint between connecting rod and crosshead and both joints of connecting rod, exploring the effect of these factor on the dynamic response. Then we make a non-linear analysis to estimate the chaos behavior. In the end, we conclude that the clearance size and the number of clearance both strongly influence the dynamic behaviors of the moving mechanism, so do the position where clearance fault happens. As the clearance size increases or the number of clearance fault increase, the acceleration will oscillate more violent and have higher amplitude, furthermore, it is more possible to show chaotic behaviors. © 2018 Qingfeng Xiao, et al.

关键词： Connecting rods

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