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Fan fault diagnosis based on wavelet spectral analysis 34

Fan fault diagnosis based on wavelet spectral analysis

引用

34th Chinese control Conference, CCC 2015

作者： Zheng, Wen Pu, Wang Xuejin, Gao Yachao, Zhang College of Electronic and Control Engineering Beijing University of Technology Beijing China Engineering Research Center of Digital Community Ministry of Education Beijing China Beijing Laboratory for Urban Mass Transit Beijing China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing China

ISBN: (纸本)9789881563897

Fan plays an irreplaceable role in the ventilation of underground environment. It will cause serious consequences once the fan fails. So it is essential to do fault diagnosis of fan to prevent the emergence of break down. Spectral analysis method is a simple and effective method for signal analysis and it has been widely used in fault diagnosis of rotating machinery. This paper has researched the bearing fault of fan on the base of in-depth study of the frequency characteristics of typical faults fan. High-frequency noise of vibration signal has been removed through wavelet soft thresholding method. Get its spectrum characteristic of the reconstructed signal, and then the failure category of signal is discriminated by comparing its characteristic frequency to typical faults frequency in theory. Combining the advantage of LabVIEW and MATLAB, we implement the algorithm through two of them, accomplishing denoising and spectral analysis of vibration signals, completing fault diagnosis of fan. © 2015 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Fan Fault Diagnosis Spectral Analysis Wavelet Denoising

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Research on the Performance of Electro-hydraulic Proportional Flow Valve controlled by Pilot Pump

Research on the Performance of Electro-hydraulic Proportiona...

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2015 International Conference on Fluid Power and Mechatronics

作者： Yunxiao Hao Jiahai Huang Wenyong Li Long Quan Bin Zhao Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Educationand Shanxi ProvinceTaiyuan University of Technology

Cartridge flow valves, widely applied in heavy machine and equipment, have the advantages of low leakage, large flow capacity, and simple structure. However, in the existence technologies, in order to reduce the influence of load variety on valve flow, a pressure differential compensator or a cartridge type flow sensor should be added to proportional throttle valve. This method reduces valve flow capacity and increases system throttling loss. In large flow occasion, flow only can be indirectly controlled by changing valve opening area for the limitation of the structure. So a low energy consumption, high controllable electro-hydraulic proportional valve which is structured by a hydraulic transistor(Valvistor) and a small displacement hydraulic pump driven by a servo motor is introduced. Based on the Valvistor valve flow amplification principle, main valve flow is controlled by pilot pump flow which is controlled by changing rotation speed without the influence of load variety. In the research, it's known from the analysis of the new principle valve steady flow characteristics that feedback throttle slot pre-opening will cause the decrease of the main valve flow as pressure drop increases. Soa method of pressure differential-pilot pump rotation speed compensation is put forward and it can obtain ideal flow characteristic. Then the dynamic mathematical model is established and the main valve stability criterion is derived. The influence of the valve parameters on main valve performance is analyzed and simulated. The results provide a new method forthe large flow electro-hydraulic proportional control system.

关键词： Valvistor Proportional flow control valve Pressure differential-rotation speed compensation Steady state characteristics

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Modeling and Optimization of Cooperative Interception and Guidance Allocation in Multi-Platform Air Defense

Modeling and Optimization of Cooperative Interception and Gu...

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第三十四届中国控制会议

作者： Jian Jia Zhihong Peng School of Automation Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education

ISBN: (纸本)9781467374439

In the multi-platform air defense combat, platforms cooperate to achieve best effect. In the traditional air defense cooperation, assigning interception units has been paid more attention. Based on the existing task allocation model, we added the cooperative guidance and time window constraints to accord with the modern battle mode. An allocation method based on decentralized auctions is also proposed. Each platform employs the heuristic method to choose proper target and confirm the execution time, then resolve the conflict by consensus rules. This method is robust for communication network, besides it can avoid the single point of failure. Simulation results show this algorithm is significantly effective and satisfies the demand of real time.

关键词： Weapon Target Assignment,Cooperative,Modeling,Time Window,Decentralized Auction

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Hybrid control and steering logic for the CMG-based spacecraft attitude control system

Hybrid control and steering logic for the CMG-based spacecra...

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IEEE Conference on control technology and Applications (CCTA)

作者： Xing Xin Zhen Li Xiangdong Liu Zhen Chen Chinese National Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology Beijing China

ISBN: (纸本)9781479977970

Considering the momentum singularity characteristics, an integrated control strategy for the control moment gyros based attitude control systems is proposed, in which the angular momentum conservation between the spacecraft and the CMG is utilized to improved the system performance both in the closed loop responsiveness and the singularity controllability. The moment exchange capability of the CMGs can be fully developed by the control logic under normal operation, while the exchange space is specifically restrained to guarantee the effectiveness of the singularity avoidance steering when gimbal lock occurs. An online uncertainty identification method based on the momentum exchange property is applied in the hybrid control logic to improve the robustness of the system for the first place, and the remaining uncertainty is further handled by an adaptive control law. Numerical simulations for the practical agile spacecraft maneuvering are conducted to verify the effectiveness of the proposed algorithms.

关键词： Space vehicles Attitude control Uncertainty Torque Kinematics control systems Robustness

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Adaptive fuzzy PD+ based spacecraft attitude maneuvering 11

Adaptive fuzzy PD+ based spacecraft attitude maneuvering

引用

2014 11th World Congress on intelligent control and Automation, WCICA 2014

作者： Zhong, Li Chen, Zhen Liu, Xiangdong Yang, Dapeng Key Laboratory for Intelligent Control and Decision of Complex System School of Automation Beijing Institute of Technology Beijing China

This paper proposes adaptive fuzzy PD+ based controller for the attitude maneuver of rigid spacecraft. Based on the error of the system, the adaptive fuzzy PD+ based controller applies adaptive fuzzy algorithm to modify the gains of PD+ attitude controller online. The advantage of the adaptive fuzzy PD+ based controller is presented in simulation results. © 2014 IEEE.

关键词： Adaptive fuzzy PD+ based controller Attitude maneuver Rigid spacecraft

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Posture Optimization of the Locust-like Hopping Robot during the Take-off Stage

Posture Optimization of the Locust-like Hopping Robot during...

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第三十四届中国控制会议

作者： Guoyu Zuo Wentian Qu Daoxiong Gong Electronic Information & Control Engineering College Beijing University of Technology Beijing Key Laboratory of Computational Intelligence and Intelligent System

ISBN: (纸本)9781467374439

This paper discussed a take-off posture optimization method of the Locust-like Hopping Robot using particle swarm optimization. The kinematic model was first established based on DH method for the locustlike hopping robot, and the mapping relation of robot from the center of mass space to the joint space was obtained. The jumping performance of the hopping robot was evaluated by computing the velocity and force directional manipulability of the hopping robot during the take-off stage, and the joint parameters of the hopping robot were obtained by particle swarm optimization. Simulation results show the optimization method is feasible and effective.

关键词： Hopping robot,DH method,Directional manipulability,Particle swarm optimization

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Design, modeling and control of a novel amphibious robot with dual-swing-legs propulsion mechanism

Design, modeling and control of a novel amphibious robot wit...

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IEEE/RSJ International Conference on intelligent Robots and systems

作者： Yang Yi Zhou Geng Zhang Jianqing Cheng Siyuan Fu Mengyin School of Automation and State Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology Beijing China

This paper describes a novel amphibious robot, which adopts a dual-swing-legs propulsion mechanism, proposing a new locomotion mode. The robot is called FroBot, since its structure and locomotion are similar to frogs. Our inspiration comes from the frog scooter and breaststroke. Based on its swing leg mechanism, an unusual universal wheel structure is used to generate propulsion on land, while a pair of flexible caudal fins functions like the foot flippers of a frog to generate similar propulsion underwater. On the basis of the prototype design and the dynamic model of the robot, some locomotion control simulations and experiments were conducted for the purpose of adjusting the parameters that affect the propulsion of the robot. Finally, a series of underwater experiments were performed to verify the design feasibility of FroBot and the rationality of the control algorithm.

关键词： Wheels Legged locomotion Propulsion DC motors Force

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Path planning for mobile robot using the novel repulsive force algorithm

Path planning for mobile robot using the novel repulsive for...

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2015 5th International Conference on Computer Sciences and Automation Engineering(ICCSAE 2015)

作者： Yunwei Jia Guoqiang Yin Lianyu Zhao Xueping Li Siyue Sun School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System

A new type of repulsive force algorithm is proposed to solve the problem of local minimum and the target unreachable of the classic artificial potential field method in this paper. The Gaussian function that is related to the distance between the robot and the target is added to the traditional repulsive force, solving the problem of the goal unreachable with the obstacle nearby;variable coefficient is added to the repulsive force component to resize the repulsive force, which can solve the local minimum problem when the robot, the obstacle and the target point are in the same line. The effectiveness of the algorithm is verified by simulation experiments based on MATLAB.

关键词： Artificial potential field localminimum goal unreachable mobile robot

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A Text Classifier of English Movie Reviews Based on Information Gain

A Text Classifier of English Movie Reviews Based on Informat...

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International Conference on Applied Computing and Information technology/International Conference on Computational Science and Intelligence (ACIT-CSI)

作者： Lianjing Jin Wei Gong Wenlong Fu Hongbin Wu CUC Communication University of China Ministry of Culture Key Laboratory of Acoustic Visual Technology and Intelligent Control System Beijing Key Laboratory of Modern Entertainment Technology Beijing China

ISBN: (纸本)9781467396431

Text classification is the foundation and core of text mining. Naive Bayes is an effective method for text classification. This paper improves the accuracy of Naive Bayes classification using improved information gain, one of methods of feature extraction, by reducing the impact of low-frequency words. In this paper, we use a widely corpus of NLTK. According to the test results, The accuracy of the classification improved significantly.

关键词： Text categorization Classification algorithms Accuracy Feature extraction Probability Training Algorithm design and analysis

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SPN-Based Performance analysis of troupes' behaviors of sharing theatres

SPN-Based Performance analysis of troupes' behaviors of shar...

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2015 International Conference on Automation,Mechanical control and Computational Engineering(AMCCE 2015)

作者： Zhiguo Hong Ying Li Wei Jiang Yongbin Wang Shuang Feng Faculty of Science and Engineering Communication University of China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Ministry of Culture Beijing Key Laboratory of Modern Entertainment Technology

ISBN: (纸本)9781510803084

At present, manage systems for entertainment performance chains are built to work as agents to collaborate all participants, such as troupes, theatres and audience etc. Analyzing and mining the mechanism of behaviors of participants is an important issue which can be important gudie to establish such manage systems. On the basis of analyzing troupes' interactive process with audience and theatre, this paper constructed a Stochastic Petri Net(SPN) model for describing the behaviors of two troupes. Furthermore, average time delay was chosen as the performance index to evaluate the performance of the model with Stochastic Petri Net Package(SPNP) 6.0. For different parameters of number of presentations, size of theatre space, space requirements, various trends and numerical results are derived thereby. The methodology of modeling and simulation in this paper can be further used to study the performance of manage systems for entertainment performance chains.

关键词： petri nets performance analysis troupe theatre

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