A Cross-Iteration Algorithm for Vehicle–Track Nonlinear Coupling Vibration Analysis

2021 ◽  
pp. 181-215
Author(s):  
Xiaoyan Lei
Keyword(s):  
Vibration Analysis ◽  
Iteration Algorithm ◽  
Nonlinear Coupling ◽  
Coupling Vibration

Coupling Vibration Analysis of Blood Vessels

2001 ◽  
Author(s):  
Jingliang Miao ◽  
Haixiang Liu
Keyword(s):  
Blood Flow ◽  
Blood Vessel ◽  
Blood Vessels ◽  
Dynamic Model ◽  
Natural Frequency ◽  
Vibration Analysis ◽  
Vessel Wall ◽  
Blood Vessel Wall ◽  
Coupled Vibration ◽  
Coupling Vibration

Abstract This paper proposes and analyzes a simple dynamic model of blood vessel wall. By studying the coupled vibration of blood flow and vessel wall, one can get the natural frequency of a blood vessel. The method used here is generalized calculus of variations. The results show that the flexibility of blood vessels has a greater influence on the fundamental frequency of the coupled vibration and the viscosity of blood vessel has little effect on the frequency of the coupled vibration but has a greater effect on the amplitude of the vibration. Therefore it is important to control both the viscosity and flexibility of blood vessels.

Numerical Simulation Method of Track Irregularities Based on Secondary Filtering

2014 ◽  
Vol 1008-1009 ◽  
pp. 1525-1529
Author(s):  
Bao Shan Xiang ◽  
Xing Han ◽  
Xue Wei Wang
Keyword(s):  
Numerical Simulation ◽  
Vibration Analysis ◽  
Simulation Method ◽  
External Excitation ◽  
Coupling Vibration ◽  
Filtering Method ◽  
Numerical Simulation Method ◽  
Simulation Results ◽  
The U.S ◽  
Track Irregularities

Track irregularities are the only external excitation in vehicle-bridge coupling vibration analysis and therefore the numerical simulation method of track irregularities is very important. The U.S. frequency spectrum is usually employed to simulate the track irregularities in China. In this paper, the secondary filtering method is introduced to the simulation of track irregularities and MATLAB programing is employed to simulate an example. Based on the comparison of the simulation results and the objective function, it is indicated that the simulation result is reliable and the method is feasible.

Multilevel finite element modeling and coupling vibration analysis of the drum in blade–disk–drum assembly

2016 ◽  
Vol 231 (6) ◽  
pp. 998-1011 ◽  
Author(s):  
Yugang Chen ◽  
Jingyu Zhai ◽  
Qingkai Han
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Multilevel Modeling ◽  
Vibration Analysis ◽  
Free Vibrations ◽  
Dominant Mode ◽  
Working Environment ◽  
Ansys Software ◽  
Coupling Vibration ◽  
Aerodynamic Loads

Blade–disk–drum (BDD) assemblies are commonly used in rotors of aeroengine. This paper investigates the vibration characteristics of the drum in the BDD assembly. In the analysis, multilevel modeling method based on ANSYS software is proposed. Free vibrations of single drum, disk-drum assembly, and the BDD assembly are calculated and carefully examined to discover the special modal shapes and coupling effects. Then according to the working environment, equivalent aerodynamic loads are imposed on blades and the drum respectively, to explore the vibration behaviors of the drum in the BDD assembly. Results reveal that, vibration of the drum, which may result in rub-impact or/and fatigue failure, can be induced by coupling vibration result from the aerodynamic loads on blades and drum, as well as the drum-dominant mode triggered by the aerodynamic loads on drum.

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