scholarly journals Influence of electrical part of traction transmission on dynamic characteristics of railway vehicles based on electromechanical coupling model

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xun Wang ◽  
Tiefeng Peng ◽  
Pingbo Wu ◽  
Litong Cui
Keyword(s):  
High Speed ◽  
Electromechanical Coupling ◽  
Low Frequency ◽  
Traction Force ◽  
Coupling Model ◽  
Transmission System ◽  
Transmission Model ◽  
Rail Transit ◽  
Mechanical Coupling ◽  
Car Body

AbstractWith the continuous development of rail transit industry and the acceleration of train speed, higher requirements are established for the operation quality of high-speed trains and the reliability of transmission system. In the process of train running, speed fluctuation and vibrations from various parts of the driving devices are common, which could be greatly affected by the traction torque. During traction transmission, the harmonic vibration torque exists in traction motor due to that the motor is connected with non-sinusoidal alternating current. In order to study the vibration influence of the electrical component of traction transmission system on the rail vehicles, i.e., bogie and car-body, an electro-mechanical coupling dynamic model for rail transit vehicles was established by explicitly incorporating the electric-induced traction into the transmission model. The dynamics responses of the vertical, lateral and longitudinal acceleration on vehicle components, such as axle box and car-body were quantitative analyzed. By comparison with field test, it was observed that there was a vibration peak of 12-times of the fundamental rotor frequency on the bogie frame and axle box, which existed at conditions of traction, uniform speed and braking. However, the vibration acceleration exhibit nearly little difference with or without traction force, especially at low frequency domain < 100 Hz.

Integrated Design of Airborne Radar Servo System Based on MATLAB/SIMULINK

2011 ◽  
Vol 204-210 ◽  
pp. 17-20
Author(s):  
Ding Zhen Li ◽  
Rui Min Jin
Keyword(s):  
Optimization Model ◽  
Electromechanical Coupling ◽  
Integrated Design ◽  
Control Design ◽  
Servo System ◽  
Coupling Model ◽  
Transmission System ◽  
Airborne Radar ◽  
Matlab Simulink ◽  
And Control

This thesis is according to the pitching part of airborne radar servo system. The electromechanical coupling model and optimization model which includes structure parameters and control parameters are built up based on model of mechanism transmission system and electricity control system. The dynamics model of mechanism transmission system includes the nonlinearity of backlash and is considered the influence of parameters for dynamics properties in structure of the mechanism transmission system. The method of integrated structure and control design is applied on the optimization model using GA. Simulation is done based on MATLAB/SIMULINK. Simulation results show that the method of integrated structure and control design is feasible and effective in servo system.

scholarly journals Electromechanical coupling dynamic modeling and analysis of vertical electrodynamic shaker considering low frequency lateral vibration

2020 ◽  
Vol 12 (10) ◽  
pp. 168781402096385
Author(s):  
Shuguang Zuo ◽  
Zhaoyang Feng ◽  
Jian Pan ◽  
Xudong Wu
Keyword(s):  
Dynamic Model ◽  
Electromechanical Coupling ◽  
Low Frequency ◽  
Coupling Model ◽  
Vertical Position ◽  
Force Model ◽  
Lateral Vibration ◽  
Modeling And Analysis ◽  
Electrodynamic Shaker ◽  
Coupling Dynamic

For the problem of relatively severe lateral vibration found in the vertical electrodynamic shaker experiment, an electromechanical coupling dynamic model of the electrodynamic shaker considering low-frequency lateral vibration is proposed. The reason and mechanism of the lateral vibration is explained and analyzed through this model. To establish this model, an electromagnetic force model of overall conditions is firstly built by fitting force samples with neural network method. The force samples are obtained by orthogonal test of finite element simulation, in which five factors of the moving coil including current, vertical position, flipping eccentricity angle, radial translational eccentric direction and distance are considered. Secondly, a 7-dof dynamic model of the electrodynamic shaker is developed with the consideration of the lateral vibration of the moving system. To obtain the transfer function accurately, the stiffness and damping parameters are identified. Finally, an electromechanical dynamic model is established by coupling the force model and the 7-dof dynamic model, and it is verified by experiments. The coupling model proposed can be further used for the control and optimization of the electrodynamic shaker.

scholarly journals Vibration and Stress Response of High-Speed Train Gearboxes under Different Excitations

2022 ◽  
Vol 12 (2) ◽  
pp. 712
Author(s):  
Wangang Zhu ◽  
Wei Sun ◽  
Hao Wu
Keyword(s):  
High Speed ◽  
Dynamic Stress ◽  
Coupling Model ◽  
Transmission Model ◽  
Railway Vehicle ◽  
Time Varying ◽  
High Speed Train ◽  
Dynamic Stresses ◽  
Vibration Data ◽  
Polygonal Wear

The vibration data of the gearbox on a high-speed train was measured, and the vibration characteristics were analyzed in this paper. The dynamic stress of the gearbox under the internal and external excitation was examined by a railway vehicle dynamic model with a flexible gearbox and a flexible wheelset. The ideal 20th polygonal wear was considered, and dynamic stresses of the gearbox under different polygonal wear amplitudes were calculated. The gear transmission model was established to study the dynamic stress of the gearbox under the influence of the time-varying stiffness of the gear meshing. Based on the rigid–flexible coupling model, and considering the influence of wheel polygonization, gear meshing time-varying stiffness, and wheelset elastic deformation, the dynamic stress of the gearbox was investigated with consideration of the measured polygonal wear and measured rail excitation. The results show that the dynamic stress of the gearbox is dominated by the wheel polygonization. Moreover, not only the wheel polygonization excites the resonance of the gearbox, but also the flexible deformation of the wheelset leads to the deformation of the gearbox, which also increases the dynamic stress of the gearbox. Within the resonant bandwidth of the frequency, the amplitude of the dynamic stresses in the gearbox will increase considerably compared with the normal case.

A New Electromechanical Coupling Model for Piezoelectric Actuator

2010 ◽  
Vol 97-101 ◽  
pp. 867-870 ◽  
Author(s):  
Zeng Hui Zhao ◽  
Yu Ping Wang ◽  
Xiang Dong Zhao ◽  
Yi Kun Yuan
Keyword(s):  
Constitutive Equation ◽  
Piezoelectric Actuator ◽  
Piezoelectric Ceramic ◽  
Electromechanical Coupling ◽  
Coupling Model ◽  
Intellectual Structure ◽  
Detailed Calculation ◽  
Dynamical Equations ◽  
Mechanical Coupling ◽  
Control Equation

Combining the constitutive equation of piezoelectric ceramic with elastic-dynamical equations and coupling theory of FEM, the finite element control equation for piezoelectric actuator is established. Detailed calculation of the electro-mechanical coupling field parameters is made by the SP1 type longitudinal-bending vibrator and results show it can be used for the transparent calculation for piezoelectric intellectual structure and avoid the black box operation in FEM software. The model lays the foundation to develop the special program for piezoelectric actuator and to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power.

scholarly journals EMFO based Supervision Kernel Entropy Component Analysis for High Speed Encrypted Transmission Model

2021 ◽  
Author(s):  
Babu M ◽  
Sathish Kumar G A
Keyword(s):  
High Speed ◽  
Daily Basis ◽  
Vital Role ◽  
Transmission System ◽  
Transmission Model ◽  
Sensitive Information ◽  
Expression Recognition ◽  
The Novel ◽  
Secure Information ◽  
Intelligent Recognition

Abstract Recently, Encryption technology plays a vital role in providing secure information. In the multimedia sector, several images and posts are broadcasted via the internet on daily basis; in which the images are transmitted on social media and are subjected to several security attacks. Therefore it is necessary to protect the images from illegal or forbidden access. This paper aims in developing a novel SKECA-EMFO based encrypted transmission system. Here, an effective encryption transmission system is designed using a Bayes minimum risk classifier to secure the sensitive information during the transmission processes. In addition to this, the SM4 encryption algorithm is employed to perform high speed encrypted transmission as well as to achieve intelligent recognition. The novel SKECA-EMFO approach is employed in demonstrating facial expression recognition thereby obtaining an optimal feature set. Finally, seven benchmark functions are utilized to examine and evaluate the effectiveness of the newly developed proposed approach. The comparative analysis is carried out with few approaches and the results reveal that the proposed approach provides better performances when compared with other approaches.

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