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Zhao B.,Jining University | Ji J.,Jining University | Zhang M.,Jining Vocational Technology College | Zhai P.,Jining University
Proceedings - 2012 International Conference on Control Engineering and Communication Technology, ICCECT 2012 | Year: 2012

For the high accuracy synchronization requirement of IEC61850 based digital substation, to apply a combination of time synchronization scheme to Substation Automation System (SAS), PTP(pricision time synchronization protocol) is adopted between bay level and process level equipment, the paper presents a method of combination of adjusted frequency and adjusted phase to achieve precision synchronization based on principle of PTP. The result of the experiment shows the algorithm is more effective. © 2012 IEEE.


Meng F.,Nanchang University | Meng F.,Jining Vocational Technology College | Wu L.,Nanchang University | Lou L.,Nanchang University
IASP 10 - 2010 International Conference on Image Analysis and Signal Processing | Year: 2010

Sinusoidal fringe is projected to the face by a double fringe 3D scanner, and it is modulated by the face profile. Two separated point clouds of the face are obtained by the conversion of fringe image with demodulation and unwrapping processing. The system is calibrated by the calibration block. Automatic registration of two point clouds of the face is conducted by calculating the rotation matrix and translation vector with coefficient analysis. Triangle reconstruction patches of the face are obtained after the processing of the point clouds. NURBS face surface reconstruction with high precision is implemented by detecting curvature, generating rectangle meshes, and building UV parameter lines and surface reconstruction. Finally reconstruction error is analyzed. It shows that the obtained face surface meets the requirement of G1 continuity with a standard reconstruction deviation of 0.017604mm. © 2010 IEEE.


Zhu Y.,Chinese Research Academy of Environmental Sciences | Zhu Y.,Fuyang Teachers College | Zhu Y.,China University of Mining and Technology | Wang X.-F.,Jining Vocational Technology College | And 2 more authors.
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2013

The traditional method of soil resistivity measurement is based on the transient characteristics of soil electrical conductivity, the soil resistivity change caused by incentive of the current can't be caught, and the accuracy of the test results hase been affected. Based on signal processing, a new measurement method for soil resistivity was put forward. To ensure the authenticity of the measurement results, in the case of low frequency AC excitation, the multi-cycle signal containing the changes of resistivity was collected, the resistivity was acquired after the signal was processed. By the simulation of soil resistivity laboratory measurement system, the disturbance of current density caused by measuring electrodes was observed visually, the measurement results under different frequency, amplitude and power supply time of excitation current were researched, furthermore, was compared with traditional methods. Simulation results show that soil resistivity measurement results are accurate and stable by proposed method.


Suxia Z.,Beijing University of Civil Engineering and Architecture | Teng L.,Beijing University of Civil Engineering and Architecture | Yunye X.,Jining Vocational Technology College | Jilong X.,Beijing Jiaotong University
Applied Mechanics and Materials | Year: 2012

In order to study the dynamic response characteristics of depressed center flat car with different velocity, based on multi-body system dynamics software SIMPACK, 320t depressed center flat car system rigid body and rigid-flexible coupling-body dynamics model were established and the dynamic response simulation analysis of empty and loaded flat was carried out under several velocities. Then maximal vertical vibration displacement amplitudes and vertical vibration accelerations of depressed centre flat frame under different velocities were obtained. It showed that the maximum accelerations and displacements amplitudes increase with as the speed gradually increased for both empty and heavy vehicles and the trends are similar for the rigid body or rigid-flexible coupling-body. But the values of rigid-flexible coupling-body are bigger than that of rigid body because the elastic vibrations from the depressed center flat frame and all levels of suspension contribute to the vertical displacement. As the speed increases, the vertical displacements of the rigid-flexible coupling-body and the elastic ones response synchronously. The vertical displacements of the empty and heavy vehicles reach their peak values at different speeds and the elastic displacement also has a large proportion, which shows that there are larger elastic vibrations at the speeds. Therefore, it is not suitable for the depressed centre flat to run at very high speeds, and the speed should be confined. © (2012) Trans Tech Publications, Switzerland.


Zhou S.,Beijing University of Civil Engineering and Architecture | Xie Y.,Jining Vocational Technology College | Xie J.,Beijing Jiaotong University | Zhang J.,Beijing Jiaotong University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2011

In order to study the dynamic response characteristics of depressed center flat car, based on multi-body system dynamics software SIMPACK, 320 t depressed center flat car system rigid body and rigid-flexible coupling-body dynamics model are established and the dynamic response simulation analysis is carried out. Then the acceleration dynamic response results of selected points in the chassis under different velocities are obtained and are compared with the experimental data. The results show that the maximum acceleration increases with as the speed gradually increased for both empty and heavy vehicles and the trends are similar for the rigid body or rigid-flexible coupling-body. But the values of rigid-flexible coupling-body are bigger than that of rigid body. At the same time, the average acceleration of the trend is consistent with the test results and the values of rigid-flexible coupled model are closer to experimental ones, indicating that the rigid-flexible coupling model is better than the rigid one and more reasonable. In addition, the dynamic response of heavy vehicle is bigger than that of empty one. © 2011 Journal of Mechanical Engineering.

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