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Feature selection approach based on physical model of transmission system in rotary aircraft for fault prognosis

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Lecture Notes in Mechanical Engineering

Lecture Notes in Mechanical engineering 2015年 19卷 765-776页

作者： Zhe, Cheng Niao-Qing, Hu Xin-Peng, Zhang Laboratory of Science and Technology on Integrated Logistics Support College of Mechatronics Engineering and Automation National University of Defense Technology ChangshaHunan410073 China

A majority of the mishaps of rotary aircraft are caused by the faults in drive train which is composed of some complex rotary mechanical systems. Planetary gear sets are common mechanical components and are widely used to transmit power and change speed and/or direction in rotary aircrafts. Planetary gear sets are epicyclical gear drive that is more complex compared to ordinary gear train, so the features of planetary gear sets is quite different from traditional features and hard to extract. This research focuses on the physical-model-based approach to extract features for planetary gear set. Physical model will be established for planetary gear set with fault. Then, the features suitable for severity estimation is selected based on the simulation signals of physical models. After that, the tests with faults seeded are carried out, and the validation has a promising result. © Springer International Publishing Switzerland 2015.

关键词： Electric power transmission

A direct expert controller design for speed control of DC motor

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Journal of Computational Information Systems 2015年第1期11卷 229-236页

作者： Gao, Hongliang Ma, Shuangbao Zhan, Xisheng College of Mechatronics and Control Engineering Hubei Normal University Huangshi China School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan China College of Mechanical Engineering and Automation Wuhan Textile University Wuhan China

This article presents a direct expert controller for speed control of DC motor. The DC motor speed control system is selected as the controlled object. The transfer function model and the difference equation model of a separately excited DC motor are constructed for controller design. In controller design, four rules according to the error and change in error of motor speed are gained. By simulation experiments, the detailed parameters are determined for basic expert controller and direct expert controller. The simulation results demonstrate that the direct expert controller has the best control effect in transient response and steady state error than PID controller and basic expert controller. ©, 2014, Journal of Computational Information Systems. All right reserved.

关键词： Three term control systems

Batch-wise updating neuro-fuzzy model based predictive control for batch processes

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Communications in Computer and Information Science 2014年 462卷 26-35页

作者： Li, Qinsheng Shanghai Key Laboratory of Power Station Automation Technology Department of Automation College of Mechatronics Engineering and Automation Shanghai University Shanghai China

ISBN: (纸本)9783662452608

In order to guarantee the control performance of the batch processes when uncertainties and disturbances exist, a neuro-fuzzy model (NFM) predictive controller based on batch-wise model modification is developed. Model modification along batch-axis is used to improve the accuracy of neurofuzzy model, and predictive control along time-axis can guarantee the optimal control consequence, which lead to superior tracking performance and better robustness compared with the conventional quadratic criterion based iterative learning control (Q-ILC) approach. An illustrative example is presented to verify the effectiveness of the investigated approach. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Model predictive control

Compliance control based for a quadruped robot walking over rough terrain

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Compliance control based for a quadruped robot walking over ...

Chinese automation Congress (CAC)

作者： Jiaqi Xu Lin Lang Honglei An Hongxu Ma Kaiying Zhu College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China PLA Special Operations University Guangzhou China

ISBN: (纸本)9781467371902

It is well-known that the walking gait for quadruped robots has great potential to travel over rough terrain because of its higher flexibility and better environment adaptability. This paper presents a control framework for a quadruped robot walking over rough terrain, which includes such features: First, a preview controller is designed to create an appropriate body trajectory to realize the desired ZMP; Second, a new optimal force distribution is presented by minimizing the sum of the weighted torque efforts of the robot; Third, a contact force based compliance controller is designed to increase robustness in face of unknown and unanticipated disturbances. Simulations were performed with no four feet supporting period, the robot model successfully fast walking over rough terrain and going upstairs and downstairs. Then in the experiments, the quadruped robot achieved going upstairs with a stair of 0.15m. Simulations and experiments demonstrate the effectiveness of our compliance control strategy.

关键词： Legged locomotion Force Robot kinematics Foot Jacobian matrices Torque

Structural shape reconstruction through modal approach using strain gages

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Communications in Computer and Information Science 2014年 462卷 273-281页

作者： Li, Li Li, Wuqian Ding, Pingan Zhu, Xiaojin Sun, Wei Department of Automation College of Mechatronics Engineering and Automation Shanghai University Shanghai Key Laboratory of Power Station Automation Technology Shanghai China

ISBN: (纸本)9783662452608

It is significant of the strain detection and shape reconstruction of flexible structures for guaranteeing the safe and reliable operation of large-scale and precision equipment, such as spacecraft, space station, satellite, et al. This paper presents a structural shape reconstruction method based on the modal approach using the real-time sensing strain data. Firstly, the displacement-strain transformation relationship is derived using a modal approach and the finite element method is used as a numerical analysis method. From the implementation point of view, the united simulation is employed by the software of MATLAB and ANSYS. Moreover, a plate flexible structure is regarded as the research object and the simulation of shape reconstruction is investigated. The simulation results show that tshe structural shape reconstruction method based on the modal approach is a novel strategy. Furthermore, the experiments are performed with strain gages and the reconstructed displacements are compared to the measured displacement data from laser displacement sensor. The error analysis is demonstrated and it is indicated that the modal approach based structural shape reconstruction method is an effective approach for structural displacement monitoring of flexible structures. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Finite element method

Integrated IMC-ILC control system design for batch processes

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Communications in Computer and Information Science 2014年 462卷 389-396页

作者： Li, Qinsheng Jia, Li Yang, Tian Shanghai Key Laboratory of Power Station Automation Technology Department of Automation College of Mechatronics Engineering and Automation Shanghai University Shanghai200072 China

ISBN: (纸本)9783662452608

Considering conventional iterative learning control (ILC) is actually an open-loop control approach within each batch, which cannot guarantee the control performance of batch process when uncertainties and disturbances exist, an integrated iterative learning control scheme is presented in this paper. The proposed approach systematically integrates continuous-time information along with time-axis and discrete-time information along with batch-axis into one uniform frame, namely an internal model control (IMC)based PID control along time-axis, while the optimal ILC along batch-axis. As a result, the operation policy of batch process leads to superior tracking performance and better robustness compared with conventional ILC strategy. An illustrative example is exploited to verify the effectiveness of the investigated approach. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Three term control systems

Face detection and tracking based on adaboost camshift and kalman filter algorithm

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Communications in Computer and Information Science 2014年 462卷 149-158页

作者： Chen, Kun Liu, ChunLei Xu, Yongjin Department of Automation College of Mechatronics Engineering and Automation Shanghai University Shanghai Key Laboratory of Power Station Automation Technology Shanghai200072 China

ISBN: (纸本)9783662452608

Face detection is an important component of the intelligent video surveillance system. Based on the MeanShift algorithm, we have developed into the CamShift algorithm. Although the traditional Camshift algorithm can track the moving object well, it has to set the tracking object by manually. Meanwhile it fails to track the object easily while the object is occluded and interfered by the same color obstructions. In order to solve the problem, according to the CamShift algorithm features, in this article, I will combine Adaboost, CamShift and Kalman filtering algorithm, which can be relied on to realize face detection and tracking automatically and accurately. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Adaptive boosting

Study of face recognition technology based on STASM and its application in video retrieval

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Communications in Computer and Information Science 2014年 462卷 219-227页

作者： Liu, Chunlei Chen, Kun Xu, Yongjin Department of Automation College of Mechatronics Engineering and Automation Shanghai University Shanghai Key Laboratory of Power Station Automation Technology Shanghai200072 China

ISBN: (纸本)9783662452608

The gradual perfection of video retrieval technology has a positive effect in maintaining public order. However, with the improving complexity of monitoring environment, the increase of related video data requires further improvement to the efficiency of video retrieval technology. Video retrieval technology aiming at processing massive video data is needed urgently and it has become hot research subject in multimedia retrieval area. In this paper, the application of face recognition technology in video retrieval is discussed. To improve the retrieval efficiency, STASM algorithm based on OpenCV software platform is designed. The research involves the acquisition of video image frame data, face recognition and detection. Experimental results demonstrate the effectiveness and efficiency of the algorithms. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Face recognition

A piezo/gear compound drive: Principles analysis and simulation

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Key engineering Materials 2014年 621卷 346-350页

作者： Xie, Xin Fan, Shixun Fan, Dapeng Liu, Hua College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9783038351863

Increasing demands regarding the light-weight, high-torque and high-precision actuator are inducing the need for new actuators and new drive principles. This paper introduces a novel principle for transforming the linear motion of high performance piezoelectric actuators into continuous rotation is implemented by two piezoelectric actuators acting on a driving gear covering a driven gear with a slightly smaller diameter. By driving the piezoelectric actuators, the driving gear is energized to move on a circular trajectory around the driven gear which is thereby slowly rotated. Firstly, the structure and driving mechanism is introduced. Secondly, transmission ratio, the demand driving force and displacement are analyzed theoretically and by the means of simulation analysis. Finally, the bottlenecks of mechanism design and machining are presented. Some instructive reference for the structure design of Piezo/Gear compound drive is provided. © (2014) Trans Tech Publications, Switzerland.

关键词： Piezoelectric actuators