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Field balancing technique of a centrifuge for combined environmental test

UPB Scientific Bulletin, Series D: Mechanical Engineering 2014年第3期76卷 33-42页

作者： Xu, Guanhua He, Wen ShenRong, Zuochao Shen, Runjie Dai, Sujiang State Key Lab of Fluid Power Transmission and Control Zhejiang Province Key Laboratory of Advanced Manufacturing Technology Zhejiang University Hangzhou 310027 China Shanghai Key Laboratory of Spacecraft Mechanism Shanghai 201109 China Dept. of Control Science and Engineering College of Electronics and Information Engineering Tongji University Shanghai 201804 China Mechanical and Electrical Engineering College Jinhua College of Profession and Technology Jinhua 321017 China

Field balancing technique of a disc centrifuge for combined environmental test is presented. Considering the influence of machining error of the rotor, a novel method of signal acquisition is put forward to detect the machining error and pick up the real unbalanced vibration signal. The correlation filtering method is adopted to obtain the amplitude and the initial phase of vibration signal simultaneously. The mass-radius product and the phase of the original unbalance are identified by the influence coefficients method. Experimental results show that the proposed field balancing technique reduces the amplitude of the vibration from 29.7μm to 2.1μm.

关键词： Signal processing

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Preparation and characterization of Al(OH)3 coated CaF2 composite powder

Preparation and characterization of Al(OH)3 coated CaF2 comp...

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作者： Li, Ming Xu, Chong Hai Chen, Zhao Qiang Xiao, Guang Chun Chu, Guang Chao School of Mechanical and Automotive Engineering Qilu University of Technology Jinan 250353 China Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry Universities of Shandong Qilu University of Technology Jinan 250353 China School of Mechanical Engineering Shandong University Jinan 250061 China

ISBN: (纸本)9783038351214

Al(OH)3 coated CaF2 composite powder was prepared by coating Al(OH)3 on surface of micro-sized CaF2 particles using heterogeneous nucleation method. Influence of Al3+ concentration, PH value and reaction temperature was studied. The result reveals that CaF2 particle was uniformly coated with a layer of Al(OH)3 and Al3+ concentration, pH value and reaction temperature are the main factors that affect coating result. Optimum technological conditions are Al3+ concentration of solution before reaction at 0.15 mol/L, pH value at 7.5 and temperature at 75°C. © (2014) Trans Tech Publications, Switzerland.

关键词： Nucleation

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Innovative Investigation of Engineering Training to Enhance Engineering Ability

Innovative Investigation of Engineering Training to Enhance ...

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2013 3rd International Conference on Social Sciences and Society(ICSSS 2013)

作者： Jin Gao Renren Wang Yanbin Shi Feng Zheng School of Mechanical and Automotive Engineering Qilu University of Technology Key Laboratory of Advanced Manufacturing and Measurement & Control Technology for Light Industry in Universities of Shandong

With the requirement of society,the innovative ability on engineering of college students has been developed and concerned in universities for *** build tight link between the engineering training and the industry production has become one important *** this paper,engineering education courses were classified and modularized,the content of which being intersected and integrated with the theoretical teaching *** the engineering teaching platform to integrate the theoretical and practical courses,innovative teaching mode was carried *** the advanced training methods and approaches,a new teaching system for engineering education was rebuilt in *** the new system,the quality and effects of engineering training have been improved,the ability of students to apply the theoretical knowledge has been enhanced,and the good creation sense of students has been strengthened.

关键词： Engineering training,Curriculum integration,Innovative ability.

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Subpixel edge detection for segmentation of the pulp fiber image

Subpixel edge detection for segmentation of the pulp fiber i...

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作者： Shi, Hong Juan Zhang, Kai Li Li, Qing Hua Key Lab. of Pulp and Paper Science and Technology of Ministry of Education Key Lab. of Advanced Manufacturing and Measurement and Control Tech. for Light Industry Universities of Shandong School of Electrical Eng. and Automation Qilu Univ. of Tech. Jinan China

ISBN: (纸本)9783038351382

In this paper the problem of accurate edge detection for pulp fibers images is discussed. The images are acquired by the smart CCD camera. Subpixel edge detection is considered that applied in the system to improve the measurement accuracy of pulp fibers. The location of a precise edge is the basis of kink index, kink Angle, curl index and other measurement parameters for the pulp fibers. A new method for subpixel edge detection of the pulp fibers is introduced. Canny operator is used to get the pixel level edge. Each edge point determines five pixels in the gradient direction. Then the least squares fitting is used to locate its sub-pixel edge. The measurement results show that the proposed subpixel edge detection method is valid to improve measurement accuracy for real time measuring the pulp fiber parameters. © (2014) Trans Tech Publications, Switzerland.

关键词： Edge detection

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Regularization particle size inversion of PCS based on fast algorithm

Regularization particle size inversion of PCS based on fast ...

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World Congress on Intelligent control and Automation (WCICA)

作者： Yanmin Zhang Qinghua Li Lipeng Wang Xingguang Qi School of Electrical Engineering and Automation Qilu University of Technology Jinan Shandong Province China Key Laboratory of Advanced Manufacturing and Measurement & Control Technology for Light Industry Universities of Shandong

Tikhonov regularization is an effective method for particle size inversion of Photon Correlation Spectroscopy (PCS). Regularization parameter selection is the key point of Tikhonov regularization algorithm for solving the first kind integral problem. In order to obtain the optimal regularization parameter, according to the Morozov discrepancy principal, this paper proposes an efficient regularization inversion method based on fast algorithm for implementing the problem of particle size distribution. Computer simulation data of monodisperse particles and bi-dispersed particles are inversed by this method respectively. The inversion results show that, when the noise level is 0~0.01, inversion results of fast algorithm are reasonable, however, when the noise level is greater than 0.005, discrepancy principal can't obtain correct inversion results. Therefore, Tikhonov regularization inversion method with fast algorithm has the advantages of high accuracy, tolerance of noises and fast speed in PCS inversion.

关键词： Noise Correlation Algorithm design and analysis Equations Photonics Noise level Spectroscopy

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Microstructure and toughening/strengthening mechanism of 5Y-ZrO2/Ti（C7N3） nano-ceramic die material

Microstructure and toughening/strengthening mechanism of 5Y-...

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The 7th International Conference on Rare Earth Development and Application

作者：许崇海陈辉肖光春衣明东张荣波 School of Mechanical and Automotive Engineering Qilu University of Technology Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong Qilu University of Technology School of Mechanical Engineering Shandong University

ZrO/Ti（CN） nano-ceramic die material with 5 mol.% YO(5Y-ZrO/Ti（CN）) was prepared with vacuum hot pressing technique at 1500 °C for 40 min at 30 MPa. The flexural strength, fracture toughness and hardness of this material is 814 MPa, 6.35 MPa·m1/2 and 11.87 GPa respectively, which is 114%, 37% and 17% higher than that of pure ZrO ceramic without any addition of YO and nano-Ti（CN）. Results showed that the mechanical properties of the ZrO ceramic could be increased with the additions of nano-Ti（CN） and YO. Both SEM and TEM were used for the observation of the microstructure and crack propagation patterns, and the toughening/strengthening mechanisms were discussed. Results showed that grain size of 5Y-ZrO/Ti（CN） nano-ceramic die material was finer than that of pure ZrO, and some nano-sized grains were found on the grain boundary which showed the grain boundary pinning effect. The grain bridging, crack deflection, crack branching and transformation toughening also could improve the mechanical properties. Besides, the trans/inter-granular mixed fracture mode could consume large amounts of fracture energy, which is beneficial to toughening and strengthening of 5Y-ZrO/Ti（CN） nano-ceramic die material.

关键词： nano-ceramic die material microstructure toughening mechanism rare earths

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Basic pursuit of an adaptive impulse dictionary for bearing fault diagnosis

Basic pursuit of an adaptive impulse dictionary for bearing ...

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International Conference on Mechatronics and control (ICMC)

作者： Jing Wang Jisheng Zhang Chang Chen Feng Tian Lingli Cui National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing China Beijing Aerospace Automatic Control Institute Beijing China Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Beijing China

ISBN: (纸本)9781479925391

The sparse decomposition based on basic pursuit is an adaptive sparse expression of the signals. An adaptive basic pursuit algorithm that uses an impulse dictionary is introduced in this article for rolling bearing vibration signal processing and fault diagnosis. In the first, a new dictionary model is constructed according to the characteristics and mechanism of rolling bearing faults. Rotational speed of bearing, dimensions of bearing and bearing fault situation, among other parameters incorporates the new mode which could simulate the real fault impulse in different fault levels. Secondly a new method of dictionary establishment called adaptive impulse dictionary combine with basic pursuit introduced in this paper for bearing fault diagnosis. Adaptive impulse dictionary is created by changing characteristic parameters progressively, which make the dictionary built by this method has a lower redundancy and a higher relevance between each dictionary atom and the analyzed vibration signal. The basic pursuit algorithm of an adaptive impulse dictionary is adopted to analyze experiment signal of the early-stage fault signals and composite fault signals of the bearing. The results demonstrate the effectiveness of the basic pursuit algorithm that uses the adaptive impulse dictionary.

关键词： Dictionaries Pursuit algorithms Fault diagnosis Vibrations Adaptation models Time-frequency analysis

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Study on the Deformations Caused by the Original Residual Stresses of Aluminum Alloy

Study on the Deformations Caused by the Original Residual St...

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The 2012 International Conference on advanced Material and manufacturing Science (ICAMMS 2012)

作者： Tang Zhitao Yu Tao Xu Liqiang School of Mechanical and Electrical Engineering&Automobile Engineering Yantai University Key Laboratory of Advanced Manufacturing and Control Technology in Universities of Shandong

The machining deformations caused by the release and redistribution of original residual stresses were studied by the theoretical analysis and finite element *** research results show that the release and redistribution of original residual stresses result in machining distortion of the plate *** exists an optimal value of material removal amount according to original residual *** the amount of the material removed exceeds the optimal value,the machining deformation can be controlled effectively.

关键词： finite element residual stresses redistribution machining deformations

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The design and simulation of the ultrasonic machining driver based on BUCK DC chopper

The design and simulation of the ultrasonic machining driver...

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IEEE International Conference on Robotics and Biomimetics

作者： Jianjun Wang Zhili Long Yang Zhao Harbin Institute of Technology Shenzhen Graduate School and the Shenzhen Key Lab for Advanced Motion Control and Modem Automation Equipment's Shenzhen China Key Laboratory of Mechanical Equipment Manufacturing and Control Technology(Guangdong University of Technology) Ministry of Education Guangzhou China

ISBN: (纸本)9781479973989

For the current problems of resent ultrasonic machining driver, for example, output power is single and power regulation is not precise. This paper presents a new type of ultrasonic machining driver based on BUCK DC chopper. The new type of ultrasonic machining driver consists of STM32F106, DDS waveform generating circuit, signal processing circuit and the most important circuit which is BUCK DC chopper circuit. Principle of the power regulation, transmission's efficiency, the working principle and operating characteristic under current continuous mode of BUCK DC chopper circuit are established in this paper. The parameters related to BUCK DC chopper circuit are calculated. The system of ultrasonic machining driver is simulated by Matlab and related experiments of the driver were carried out. The experiments results show that the driver of new type based on DC chopper can achieved the expect function.

关键词： Choppers (circuits) Acoustics Machining Inverters Power generation Power amplifiers Inductors

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Analysis of Hydraulic Press Servo System Based on Robust controller

Analysis of Hydraulic Press Servo System Based on Robust Con...

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International Conference on Machine Tool technology and Mechatronics Engineering, ICMTTME 2014

作者： Feng, Jing Chang Kong, Xiang Dong Zhang, Jin Wang, Li Juan Liu, Chun Qing Advanced Manufacturing Technology and Equipment National Engineering Research Center for Local Joint Yanshan University Qinhuangdao China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Qinhuangdao China School of Mechanical Engineering Yanshan University Qinhuangdao China Northern Heavy Industries Group Co. Ltd Shenyang United States

ISBN: (纸本)9783038352464

This paper researches and analyzes the modeling of electro-hydraulic proportional servo system to improve the characteristics of forging hydraulic servo control system and meet their requirements of forging a variety of materials. Based on robust compensator design, PID control strategy is proposed with uncertain disturbance of hydraulic press hydraulic servo system and the response characteristics of the system is simulated and analyzed. The results show that hydraulic press servo system which uses robust compensator has better performance than the traditional PID control and the chattering is eliminated. The test results and simulation results are compared by building simulation test system of 60MN hydraulic press electro-hydraulic proportional control system. © 2014 Trans Tech Publications, Switzerland.

关键词： Three term control systems

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