检索结果-内蒙古大学图书馆

Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Wanlu Jiang Zhenbao Li Anqi Jiang Yafei Lei Haonan Wang Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao China

Aiming at the problem that rolling bearings are widely used but have high failure rate. A fault diagnosis method combined with local projective noise reduction method and recurrence plots quantification analysis for rolling bearings is presented. The fault vibration signals of rolling bearings are taken as the analysis objects. Firstly, the vibration signal is denoised by local projective noise reduction method. Then, the recurrence plots of denoised vibration signals are drawn. The system dynamic behavior reflected in the recurrence plots is extracted by recurrence quantification analysis. The determinism (DET) and entropy (ENTR) are selected to form the characteristic vectors. Finally, the characteristic vectors of the training samples are clustered by kernel fuzzy C-means (KFCM) clustering method. The minimum Euclidean distance principle is used to identify the test samples. Comparing the recurrence plot quantification analysis method with the quantitative feature method of phase space complex network. The results show that the recurrence plots quantification analysis-based fault diagnosis method of rolling bearings has a higher diagnosis rate.

关键词： Time series analysis Rolling bearings Complex networks Noise reduction Fault diagnosis Kernel Machinery

来源：评论

学校读者我要写书评

暂无评论

Research on On-Board Geometric Information Measurement System of Road Restricting Based on the Binocular Stereo Vision Principle

Research on On-Board Geometric Information Measurement Syste...

引用

International Conference on Smart City and Systems Engineering (ICSCSE)

作者： Yuqin Zhao Jingchao Liu Runsheng Zhang Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao Hebei China College of Vehicle and Energy Yanshan University Qinhuangdao Hebei China

ISBN: (纸本)9781509055319

This article developed an on-board road restrictions geometric information measurement system, it is based on the principle of binocular stereo vision. This thesis complete the stereo camera calibration, finished the establishment of stereo camera model. According to the characteristics of the bridges and tunnels' lower edge, this thesis proposes a bridge detection method based on vehicle vision. The results show that, the system has good real-time performance and high reliability, can effectively reduce the traffic accident like wedging or hitting bridges caused by over-height vehicles.

关键词： Image edge detection Bridges Cameras Vehicles Image segmentation Feature extraction

来源：评论

学校读者我要写书评

暂无评论

Research on Algorithm of Braking Pressure Estimating for Anti-lock Braking System of Motorcycle

Research on Algorithm of Braking Pressure Estimating for Ant...

引用

2016 IEEE/CSAA International Conference on Aircraft Utility Systems(AUS)

作者： Jing YAO Yang ZHANG Juan WANG Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Hebei Province Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University School of Mechanical Engineering Yanshan University

An effective pressure estimation algorithm of ABS for motorcycles was proposed in this paper to get the relatively accurate wheel cylinder ***,the performance characteristics of hydraulic control unit was studied and the vehicle model was established by using ***,the pressure estimation algorithms of master cylinder and wheel cylinder were *** estimated pressure is modified according to different vehicle braking ***,based on an actual motorcycle the wheel cylinder pressure was obtained under different pavements and braking initial speeds by ABS experimental platform to validate the effectiveness of wheel cylinder pressure estimation *** results show that the actual wheel cylinder pressure can be well tracked by the estimated wheel cylinder pressure with an allowable pressure error.

关键词： anti-lock braking system of motorcycle pressure estimation hydraulic control unit vehicle model

来源：评论

学校读者我要写书评

暂无评论

Frictional characteristics of sheet metals with superimposed ultrasonic vibrations

引用

Journal of Central South University 2018年第8期25卷 1879-1887页

作者： CAO Miao-yan LI Jian-chao LIU Yan-yang YUAN Ya-ning ZHAO Chang-cai DONG Guo-jiang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China Chinese Academy of Agricultural Mechanization Sciences Beijing 100083China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education of China Yanshan UniversityQinhuangdao 066004China College of Vehicles and Energy Yanshan UniversityQinhuangdao 066004China

The forming performance of sheet metals in the deep-drawing process with ultrasonic vibrations can be improved by the surface effect between the sheet metal and the die.A sheet metal friction test with ultrasonic vibrations is performed to explore the cause of the surface *** frictional characteristics are investigated,and the corresponding friction expressions are established based on the contact mechanics and the elastic–plastic contact model for rough *** is caused by the elastic–plastic deformation of contacting asperities under normal *** actual contacting region between two surfaces increases with normal loads,whereas the normal distance *** normal distance between the contacting surfaces is changed,asperities generate a tangential deformation with ultrasonic vibrations,and the friction coefficient is eventually *** vibrations are applied on a 40Cr steel punch at the frequency of 20 kHz and the amplitude of 4.2μ*** the friction tests,the punch is perpendicular to the surface of the magnesium alloy AZ31B sheet metals and is sliding with a relative velocity of 1 mm/*** test results show that the friction coefficient is decreased by approximately 40%and the theoretical values are in accordance with the test values;Ultrasonic vibrations can clearly reduce wear and improve the surface quality of parts.

关键词： friction ultrasonic vibrations sheet metals contact model

来源：评论

学校读者我要写书评

暂无评论

The energy saving factor research of secondary regulation system of cement coating machine

引用

ICIC Express Letters, Part B: Applications 2015年第11期6卷 3077-3084页

作者： Kong, Xiangdong Luo, Hongliang Ai, Chao He, Long Dong, Yanwu Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China No. 438 Hebei Avenue Qinhuangdao China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Avenue Qinhuangdao China

The cement coating machine is widely used, but it wastes a lot of energy when braking. In order to overcome the weakness, secondary regulation system is put forward to recycle energy. Firstly the secondary regulation speed control system is proposed. Then the mathematical model of hydraulic secondary regulation system is established, and efficiency calculation method is derived. At last, through the simulation analysis and experimental verification, the feasibility of energy saving project is proved. With bigger slope and lower hydraulic pressure, the system can recycle more energy. © 2015 ICIC International.

关键词： Energy conservation

来源：评论

学校读者我要写书评

暂无评论

Output Feedback Control of Hydraulic Driven Flexible Actuator with Imprecise Modeling

Output Feedback Control of Hydraulic Driven Flexible Actuato...

引用

第43届中国控制会议

作者： Huidong Hou Jinsong Zhao Yi Liu Xianwei Niu Yunpeng Zhang School of Mechanical Engineering Yanshan University State Key Laboratory of Crane Technology Yanshan University Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

In recent years,flexible soft robots have received increasing attention compared to rigid robots. The modeling of flexible actuators has always been difficult to solve. The control problem of hydraulic driven flexible actuators in this paper under the premise of imprecise modeling. In this paper,an innovative output feedback controller based on Unknown System Dynamics Estimator(USDE) is proposed to improve the position tracking accuracy of hydraulic driven flexible actuators with imprecise model. Firstly,the strict feedback high order electro-hydraulic servo system is transformed into a new standard form that incorporates servo valve dynamics. Therefore,controllers designed using traditional backstepping methods are rendered obsolete. Subsequently,a High-Gain Observer(HGO) is introduced for state reconstruction of the new system. To counteract the impact of lumped unknown system dynamics which include imprecise modeling dynamics of hydraulic driven flexible actuator,a USDE with straightforward parameter tuning and robust performance is introduced. Finally,both scalar containing error terms and USDE are integrated into the design of the output feedback controller. Experimental validation is conducted to demonstrate the effectiveness of the proposed method.

关键词： Electro-hydraulic servo system Flexible actuator Imprecise model estimation Output feedback control

来源：评论

学校读者我要写书评

暂无评论

Reliability Prediction Method of Hydraulic System by Fuzzy Theory

引用

IFAC Proceedings Volumes 2013年第5期46卷 457-462页

作者： Dongning Chen Chengyu Yao Zhongkui Feng Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China (Tel: ***) Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao China Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

The hydraulic system's reliability is a key factor to ensure the reliable operation of equipment and it is very important to evaluate reliability of hydraulic system. The paper describes a reliability prediction method that may be used to evaluate the reliability of hydraulic systems for industrial applications. The proposed method takes advantage of fuzzy set theory. The aim of this method is to minimize the deficiencies of the traditional reliability prediction methods treating a failure rate as fixed value due to insufficiency practice data. Triangular fuzzy number and Gaussian fuzzy number are used in the application of this prediction method, where environmental factor, derating factor, and other factors are considered. Finally, an example of type crane's hydraulic system is given to verify the feasibility and practicability of the method.

关键词： Type crane Hydraulic system Reliability prediction Fuzzy theory Reliability logic diagram

来源：评论

学校读者我要写书评

暂无评论

Reliability Optimization of Multi-state Hydraulic System Based on T-S Fault Tree and Extended PSO Algorithm

引用

IFAC Proceedings Volumes 2013年第5期46卷 463-468页

作者： Chengyu Yao Bin Wang Dongning Chen Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China (Tel: ***) Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao China

In order to overcome the difficulty of constructing the multi-state system's reliability optimization model, and the shortage of premature convergence of PSO (Particle Swarm Optimization) algorithm, a new reliability optimization method based on T-S fault tree and EPSO (Extended PSO) algorithm is proposed. According to the T-S fault tree and T-S rules of the events, the multi-state system reliability optimization model is constructed, at the same time, given constraint conditions on the system cost, weight and volume, and combined with the death penalty to construct the fitness function. Furthermore, EPSO algorithm based on the attraction and repulsion forces in the artificial physics is applied to the reliability optimization of multi-state hydraulic system. Comparing with PSO algorithm, the results of EPSO algorithm are in a better performance in obtaining global optimal solution.

关键词： Hydraulic system Reliability optimization Multi-state T-S fault tree EPSO algorithm

来源：评论

学校读者我要写书评

暂无评论

Simulation and Experimental Research of Digital Valve Control Servo System Based on CMAC-PID Control Method

Simulation and Experimental Research of Digital Valve Contro...

引用

第六届工程机械与车辆工程新进展国际学术会议

作者： ZHAO Jin-song ZHAO Zi-ning WANG Zhi-peng ZHANG Chuan-bi YAO Jing Hebei Province Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University) Ministry of Education of China School of Mechanical Engineering Yanshan University

Digital valve control servo system is studied in this *** order to solve the system problems of poor control precision and slow response time,this paper proposes a CMAC-PID(Cerebellar model artic

关键词：

来源：评论

学校读者我要写书评

暂无评论

Fault diagnosis method for hydraulic pump based on order tracking

Fault diagnosis method for hydraulic pump based on order tra...

引用

International Conference on Fluid Power and Mechatronics (FPM)

作者： Wanlu Jiang Yong Zhu Meng Wang Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China Qinhuangdao China

ISBN: (纸本)9781479987719

Aiming at the problem of extracting fault features from hydraulic pump under variable rotating speed, a fault diagnosis method based on order tracking was proposed. Firstly, the original signal was decomposed by ensemble empirical mode decomposition into a series of intrinsic mode function (IMF) components. Afterwards, the fault sensitive IMF was selected by combining energy spectrum and spectral kurtosis. Secondly, the selected IMF was processed by Hilbert demodulation and down-sampling. Moreover, an appropriate frequency band was chosen and the signal was further processed by wavelet cluster-based bandpass filtering. Then, the fault sensitive envelope signal was obtained. Thirdly, the instantaneous frequency was extracted from the envelop signal by wavelet ridge tracking, and the time instant of phase discrimination was further calculated. Moreover, the even angle spaced resample was performed to the envelope signal. Then, the time domain non-stationary signal was transformed to the angular domain stationary signal. Finally, the stationary signal was analyzed by order tracking, and the fault diagnosis was executed according to the order spectrum. Furthermore, an application was performed to the vibration signals of hydraulic pump under variable rotating speed. The signals were respectively acquired in four typical states, which were normal, loose slipper, slipper wear and swash plate wear. Results indicate that the proposed method can effectively extract the fault features of hydraulic pump and further realize fault diagnosis.

关键词： Vibrations Fault diagnosis Feature extraction Time-domain analysis Pumps Valves Demodulation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：