scholarly journals Modeling and Parameter Optimization of Dynamic Characteristic Variables of Ballast Bed during Operation for Dynamic Track Stabilizer

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Bo Yan ◽  
Jingjing Yang
Keyword(s):  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Traffic Density ◽  
Operating Parameters ◽  
Simulation Accuracy ◽  
Railway Line ◽  
Coupling System ◽  
Track System ◽  
Parameterized Model ◽  
Railway Maintenance

The high traffic density of railway line causes ballasted track to be extremely busy, and thus it is particularly important to improve the efficiency during railway maintenance. The changing law of dynamic characteristics of ballast bed during operation for the dynamic track stabilizer is conducive to optimize simulation analysis of the vehicle-track system, so as to provide an optimized choice of operating parameters for promoting the pertinence and efficiency of dynamic track stabilizer. This paper presents the acceleration response of vehicle-track-subgrade system during operation of a WD-320 dynamic track stabilizer and proposes the range of effective operating parameters. Then, the influence of operating parameters on the dynamic characteristics of the ballast bed is discussed for searching the optimal operating parameters under the single factor influence. Finally, the change laws including the support stiffness, damping, lateral resistance, and subsidence for the ballast bed are studied, and a parameterized model for dynamic characteristics of the ballast bed which can optimize the selection for operating parameters is constructed, rendering an effective reference variable for improving the simulation accuracy of the vehicle-track coupling system.

Dynamic characteristics of wheelset-track system under corrugation excitations in metro

2020 ◽  
Author(s):  
Zhiqiang Wang ◽  
Zhenyu Lei
Keyword(s):  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Rolling Contact ◽  
Dynamic Responses ◽  
Vertical Force ◽  
Frequency Multiplication ◽  
Dynamic Action ◽  
Track System ◽  
Initial Irregularity ◽  
The Impact

There are few systematic researches on the dynamic characteristics of wheelset-track system under different corrugation excitations. In order to study the influence of different corrugations on the wheelset-track dynamic characteristics, a three-dimensional wheelset-track rolling contact model is established and the model rationality is analyzed. Then, the wavelength and wave depth of the initial corrugation irregularity for simulation analysis are determined according to the measured data. Finally, the wheel-rail vertical force and wheel vertical vibration acceleration are selected as the output variables, and the wheelset-track dynamic responses under excitations are studied. The results show that comparing with the middle/long wavelength irregularity, the short wavelength irregularity will not increase the amplitude of wheel-rail dynamic action, but will increase the frequency of wheel-rail dynamic action. The initial irregularity wave depth will not affect the frequency of wheel-rail dynamic action, but will affect the amplitude of wheel-rail dynamic action, and the greater the amplitude of the wave depth is, the greater the impact on the dynamic responses of wheelset-track system is. The main characteristic frequencies of output variables are close to the initial irregularity passing frequency, and the other peak frequencies are in a frequency multiplication relationship with the initial irregularity passing frequency.

scholarly journals Analysis of Nonlinear Dynamic Characteristics of a Mechanical-Electromagnetic Vibration System with Rubbing

2019 ◽  
Vol 9 (21) ◽  
pp. 4612
Author(s):  
Yiming Li ◽  
Zhilong Huang ◽  
He Li ◽  
Guiqiu Song
Keyword(s):  
Friction Coefficient ◽  
Dynamic Characteristics ◽  
Chaotic Motion ◽  
Nonlinear Dynamic ◽  
Response Amplitude ◽  
Jump Discontinuity ◽  
Excitation Current ◽  
Radial Stiffness ◽  
Chaotic Region ◽  
Coupling System

In this study, a rotor-bearing-runner system (RBRS) considering multiple nonlinear factors is established, and the complex nonlinear dynamic behavior of the coupling system is studied. The effects of excitation current, radial stiffness, and friction coefficient on dynamic characteristics are analyzed by numerical simulation. The research results show that the dynamic properties of the coupling system caused by different nonlinear factors are interactional. With the changes of different parameters, the RBRS presents multiple motion states, including periodic-n, quasi-periodic, and chaotic motion. The increase of the excitation current Ij has a certain inhibitory effect on the response amplitude of the system and makes the motion state of the system more complex, the chaotic motion wider, and the jump discontinuity enhanced. With the increase of radial stiffness kr, the motion complexity of the coupling system increases, the chaotic region increases, the response amplitude increases, and the vibration intensity increases. With the increase of the friction coefficient μ, the chaotic region increases first and decreases, the different motions alternate frequently, and the response amplitude gradually increases. This study can not only help to understand the dynamic characteristics of RBRS, but also help the stable operation of the generator set.

Dynamic Simulation Analysis of Asymmetric Involute Gear Drive System

2012 ◽  
Vol 215-216 ◽  
pp. 974-977 ◽  
Author(s):  
Li Ming Lian ◽  
Gui Min Liu
Keyword(s):  
Dynamic Simulation ◽  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Dynamic Performance ◽  
Transmission System ◽  
Drive System ◽  
Gear Transmission ◽  
Gear Drive ◽  
Involute Gear ◽  
Gear Transmission System

The dynamic performance of asymmetric involute gear transmission system is analyzed by the MSC.ADAMS software during the paper. By comparative analyzed with the traditional dynamic characteristics of symmetrical involute straight gear transmission, it can be summarized that the asymmetric involute gear transmission system has better vibration characteristics in the course of transmission.

scholarly journals Research on Dynamic Characteristics of Rigid-Flexible Coupling System

2019 ◽  
Vol 1325 ◽  
pp. 012189
Author(s):  
Li Li ◽  
Wei Lixin ◽  
Liu Mingmin ◽  
Li Jiazhao
Keyword(s):  
Dynamic Characteristics ◽  
Flexible Coupling ◽  
Coupling System

The Numerical Simulation Analysis of Irregular Frame Structure Dynamic Characteristics

2013 ◽  
Vol 739 ◽  
pp. 373-375
Author(s):  
Fang Zhang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Structure Design ◽  
Frame Structure ◽  
Ansys Software ◽  
Mass Percentage ◽  
Structure Dynamic ◽  
Characteristics Analysis ◽  
Dynamic Characteristics Analysis

A bump of irregular frame structure as an example, the use of ANSYS software, the structure dynamic characteristics analysis, given the cycle ratio and modal participation mass percentage, as the bump of irregular frame structure design reference.

Numerical Simulation of Flash Floods Routing Based on Improved Leap-Frog Method

2013 ◽  
Vol 347-350 ◽  
pp. 2173-2177
Author(s):  
Jia Hua Zhang ◽  
Chi Zhang
Keyword(s):  
Numerical Simulation ◽  
Moving Boundary ◽  
Simulation Analysis ◽  
Flash Flood ◽  
Mass Conservation ◽  
Correction Method ◽  
Gansu Province ◽  
Simulation Accuracy ◽  
Whole Process ◽  
Steep Terrain

in the 2-d numerical simulation of flash flood disaster, due to flood often occurred in the steep terrain and water flow rapidly changed, lead to that the calculated value is unstable and even the calculation diverge in the simulation. This paper presents a grid outflow correction method, which is based on the leap-frog finite difference format, through modifying the outflow rate of the grid circularly, to ensure the mass conservation in the whole process of computing. In the local dam bursting model, the simulated result comparison of the grid outflow correction method and the algorithm of implicit alternating direction on the mass conservation shows that, the new method can ensure the simulation accuracy and the numerical stability under the condition of steep terrain and moving boundary. According to the proposed method, the simulation analysis in the process of extreme flash flood disasters which happened in 2010 Zhouqu county in Gansu province was carried out. The comparison of simulation results and remote sensing estimation results shows that the deviation of the flood evolution time, speed and impact height are within 5%, and the consistency of evolution path is good, which verifies the validity of the algorithm.

Dynamic Characteristics Study on Hydraulic Impact of Cartridge Valve in High Pressure and Large Flow Depressurization Process

2012 ◽  
Vol 510 ◽  
pp. 350-355
Author(s):  
Kang Sun ◽  
Wen Chen ◽  
Jian Ping Tan
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Dynamic Characteristics ◽  
Simulation Analysis ◽  
Analysis Software ◽  
Hydraulic Oil ◽  
Hydraulic Impact ◽  
The Stability ◽  
Impact Characteristics ◽  
Large Flow

Dynamic analysis software ANSYS/LS-DYNA is applied to fluid-structure coupling simulation analysis of cartridge valve. Transient mechanical properties of cartridge valve and impact characteristics of interaction between hydraulic oil and valve spool in depressurization process were got. The result of study showed that the stability of depressurization process is related to the contacting time between valve spool and valve sleeve. The squeezing time of hydraulic oil is best not more than 0.01s. The peak impact time of hydraulic oil to valve spool in steady depressurization process is 140kN. And the maximum VonMises between valve spool and valve sleeve is 456MPa.

Sign in / Sign up

Export Citation Format

Share Document