Ding J.,Xiangtan University |
Ding J.,CSR Zhuzhou Institute Co. |
Zhang P.,Xiangtan University |
Wang P.,CSR Zhuzhou Institute Co.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2016
Standards IEC61373 of version 1999 and version 2010 are analyzed and compared, and it's found that the severity levels for random vibration test of the two versions are the same. However, due to the change of the calculation method of acceleration ratio, the severity level for simulating the long life testing at increased random vibration levels is significant declined. In order to compare differences between field measurement data of railway line and vehicle in China and the standard IEC61373, the acceleration vs. time history of HXD1C electric locomotive in poor condition like Lanzhou-Xinjiang railway line, and that in good condition like Zhuzhou-Guangzhou section of the Beijing-Guangzhou railway line are measured separately. According to the data processing and the analysis, it is indicated that the vibration level and standard deviation of measured data in China are relatively large and the data are comparatively discrete. The random vibration simulations for traction converter of HXD1C electric locomotive are carried out by using the functional acceleration spectral density (ASD) of standard IEC61373 and the measured data as excitation respectively. Compared with the obtained results of standard spectrum, the maximum 1σ stress of measured spectrum is higher by 2.4% in vertical, 9.0% in transverse and 22.8% in longitudinal directions respectively, which indicates that the maximum 1σ stress of typical equipments excited by measured spectrum is greater than that of the standard spectrum. © 2016 Journal of Mechanical Engineering.
Wang Y.,Shanghai JiaoTong University |
Luo Y.,Shanghai JiaoTong University |
Liu H.,CSR Zhuzhou Institute Co.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2015
By considering the practical assembly process of the body bolster, Welding structure analysis system (Weld-Sta) is employed to predict the welding deformation of the structure. Firstly, finite element models and welding lines of each step are constructed. Then, the welding deformation of each step is calculated in corresponding model. Thirdly, the whole welding deformation is summed up by the one from each steps. Finally, the welding deformation of the structure is calculated in one step. By comparing the welding deformation predicted by simulated results including two methods-considering welding sequence and not considering welding sequence with that of measured results, the reliability of this method is confirmed. This study can provide a guideline for the designation and determination of welding procedures on body bolster. © 2015, Harbin Research Institute of Welding. All right reserved.
Zhong H.,University of Electronic Science and Technology of China |
Zhong H.,University of Sichuan |
Du P.,University of Electronic Science and Technology of China |
Tang F.,CSR Zhuzhou Institute Co. |
Wang L.,University of Electronic Science and Technology of China
Applied Energy | Year: 2015
Wind turbine wakes have significant effects on the production efficiency and fatigue loads, and these effects should be considered in the optimization of wind turbine structure and wind farm layouts. In this paper, a numerical model combining Lagrangian dynamic large-eddy models and actuator line methods (ALMs) is implemented to investigate the wind turbine near wakes at three representative tip speed ratios (TSRs). In the model, several model parameters that have been justified based on the existing literature and experiments are utilized to enhance the numerical stability and accuracy. These parameters are related to a physically meaningful length scale in the Gaussian smoothing function, a Prandtl tip/hub-loss factor and a 3D correction for airfoil data. The model is compared to the MEXICO measurements, in which a detailed stereo PIV measurement is carried out. According to the comparison of rotor power coefficients between the prediction and the measurements, there is a slight overestimate at TSRs of 6.67 and 10, while a slight underestimate at TSR of 4.17. Additionally, according to the comparison of streamwise traverses and spanwise distribution of axial velocities, good agreement is achieved at both TSRs of 4.17 and 6.67, while visible difference is found at TSR of 10. Moreover, the simulation result shows a helical behavior of wake tip vortices induced by the turbine rotor. This behavior gets more pronounced with a decreasing TSR. The tip vortices also give a reasonable explanation of why the maximum velocity deficit and turbulence intensity occur near the blade tip of wind turbines. © 2015 Elsevier Ltd.
Liang J.,CSR Qingdao Sifang Locomotive and Rolling Stock Co. |
Rong Z.,CSR Zhuzhou Institute Co. |
Zhang Z.,CSR Zhuzhou Institute Co. |
Luo W.,CSR Zhuzhou Institute Co.
Lecture Notes in Electrical Engineering | Year: 2016
A series of train net matching problems arising from the high-order harmonics of AC drive trains have severely affected the safe operation of the railway system. For the sake of analyzing and solving the problems in a systematic way, some basic conclusions and laws are obtained on the basis of making theoretical analysis for the traction current control model and harmonic characteristic of AC drive trains, and through considering the impedance model of traction nets and making the detailed simulation analysis for the voltage harmonic of traction nets, the harmonic relationship between current and voltage, as well as the train net system harmonic coupling relationships such as the mutual effect of harmonics when multiple locomotives are running, which provide guidance and reference for analyzing the practical problems and studying the subsequent suppression techniques in engineering application. © Springer-Verlag Berlin Heidelberg 2016.
Zhang T.,CSR Zhuzhou Institute Co. |
Jiang G.,CSR Zhuzhou Institute Co. |
Tang J.,CSR Zhuzhou Institute Co.
Lecture Notes in Electrical Engineering | Year: 2016
We demonstrate a multi-flow routing strategy based on streamline effect for optical burst switching (OBS) networks used in rail transportation. The simulation results fully prove that the strategy can achieve fast speed and ideal burst loss ratio (BLR). © Springer-Verlag Berlin Heidelberg 2016.
Feng J.-H.,CSR Zhuzhou Institute Co. |
Wang J.,CSR Zhuzhou Institute Co. |
Li J.-H.,CSR Zhuzhou Institute Co.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2012
The CRH2 high-speed train traction drive system structure and working principle were described. The high-speed train integrated simulation platform based on co-ordinated multidisciplinary simulation was studied. System requirements were analyzed completely with the tool of Rational Rose supporting UML. The constituent components and their functions of the simulation platform were introduced. The hybrid network system architecture based on HLA/RTI and the reflective memory network was proposed. Comprehensive simulation of the CRH2 high-speed train was conducted on the platform. The validity of the simulation platform was verified.
Ding R.,CSR Zhuzhou Institute Co. |
Liu G.,CSR Zhuzhou Institute Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014
To meet the demand of application in ±1 100 kV ultra-high voltage direct current (UHVDC) transmission and adapt to the development tendency of higher voltage, higher current capacity and higher reliability for the converter valve thyristors, based on the existed technology of 6-inch thyristor in CSR and using the method of computer simulation and trial production and test, the electric field distribution of thyristor chip edge, voltage stability, the device's internal thermal distribution and external heat dissipation, as well as the thyristor current capacity have been improved by means of optimizing thyristor chip structure design. What is more, optimizing the design of thyristor chip's amplifying gate improves the device's dynamic characteristics. Furthermore, the trade-off between the thyristor static parameters and dynamic characteristics has been achieved when the advanced electron irradiation technology had been adopted and irradiation process had been optimized. The 6 inches 5 000 A/8 500 V thyristor devices, CSR researched and developed, meet all static and dynamic parameters and pass the reliability test, which can satisfy the application requirements of ±1 100 kV UHVDC converter valves. © 2014 Chinese Society for Electrical Engineering.
Li G.-D.,Zhejiang University |
Hu Y.-Q.,CSR Zhuzhou Institute Co. |
Liu X.-G.,Zhejiang University
Zidonghua Xuebao/Acta Automatica Sinica | Year: 2015
The control vector parameterization (CVP) method is currently popular for solving optimal control problems in process industries. However, one of its main disadvantages is the low computational efficiency, because the relevant differential equations in solving the generated nonlinear programming (NLP) problem should be calculated repeatedly with the adjustment of control, which is the most time-consuming part of the CVP method. A new fast approximate approach with less computational expenses on differential equations, function values and gradients is therefore proposed to improve the computational efficiency of the CVP method in this paper. The proposed approach is demonstrated to have marked advantages in terms of accuracy and efficiency, in contrast to mature optimal control softwares, on two classic optimal control problems. Copyright © 2015 Acta Automatica Sinica. All rights reserved.
Liu H.,CSR Zhuzhou Institute Co. |
Zhang D.,CSR Zhuzhou Institute Co. |
Tang J.,CSR Zhuzhou Institute Co. |
Qiu Y.,CSR Zhuzhou Institute Co.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2012
Aimed at the insufficient capacity of mitigating electric arc furnaces (EAF) flicker problems for the traditional double-closed-loop control mode of static synchronous compensator (STATCOM), this paper calculates the compensation current command which achieves the minimum voltage fluctuation by analyzing the various EAF distribution network voltage and current phasor, and directly calculates the control voltage command according to the principle of the network instantaneous power equal to the STATCOM instantaneous power. So the STATCOM controller is less three PI regulators than the traditional dual-loop control mode, and the response time from the original 20ms is reduced to 10ms, so it improves the ability of voltage flicker suppression. Simulation and actual operating results verify that the proposed control strategy in this paper is effective and correct.
Jing H.,Central South University |
Jing H.,CSR Zhuzhou Institute Co. |
Nian X.,Central South University
Gaodianya Jishu/High Voltage Engineering | Year: 2012
To improve the application of DC ice-melting technology in power grids, a new type of flexible DC ice-melting technology was proposed. Based on analysis on the equivalent model of frozen transmission lines and the heat exchange during ice-melting, the necessary anti-icing current and maximum current were calculated for a 220 kV power line. A novel flexible DC ice-melting power based on self-commutated semiconductors was designed according to the calculation results. The main circuit topology, mathematical model and control strategy of the power unit module were introduced and discussed. Finally, a full-controlled DC ice-melting device prototype was developed, of which the test has been carried out too. Test results show that the ice-melting device can regulate DC output flexibly, while the harmonic contents on line side, which is only 3.16% in the test, also meet requirements.