Study on Geometry Filtering Phenomenon and Flexible Car Body Resonant Vibration of Articulated Trains

2013 ◽  
Vol 787 ◽  
pp. 542-547 ◽  
Author(s):  
Dao Gong ◽  
Yue Jia Gu ◽  
Jin Song Zhou
Keyword(s):  
Low Frequency ◽  
Ride Quality ◽  
Green Functions ◽  
Resonant Vibration ◽  
Flexible Coupling ◽  
Car Body ◽  
Articulated Vehicles ◽  
Coupling Dynamic ◽  
Track Irregularity ◽  
Coupling Dynamic Model

A vertical rigid-flexible coupling dynamic model of three articulated vehicles with car body flexibility is established, Green functions are utilized to solve the partial differential equation of each car body, and the mechanism of car body flexible resonance is analyzed. Results show that geometry filtering phenomenon exists in articulated train, when the car body first vertical bending frequency coincides with the frequencies which have the peak values of car body bounce acceleration transmissibility, resonant vibration of flexible car body will happen; The energy of track irregularity decreases rapidly with the increasing frequency, so it is important to avoid the car body resonance at low frequency; If the first vertical bending frequency of car body is greater than a certain value, the flexible resonance will have little effect on the ride quality.

Numerical Analysis for Dynamic Characteristics of New Launcher with Coupled Rigid and Flexible Motion

2010 ◽  
Vol 34-35 ◽  
pp. 44-49 ◽  
Author(s):  
Ying Ze Wang
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Dynamic Characteristics ◽  
High Performance ◽  
Coupling Effect ◽  
The Other ◽  
Flexible Coupling ◽  
Simulation Based ◽  
Coupling Dynamic ◽  
Coupling Dynamic Model

This paper is concerned with an analysis of the dynamic characteristics of the high performance launcher—rarefaction wave gun(RAVEN) by numerical simulation. Based on its launch mechanism and launch structure, a rigid-flexible coupling dynamic model which considered the coupling effect between the flexible virbation of the launch barrel and the motion behaviors of the other parts of the RAVEN is established via a subsystems method. The actual motion of the projectile and inertial breech during the lauching are described by the interior ballistic equations of the RAVEN. The dynamic characterisitcs of RAVEN is illustrated by the numerical simulation about a small caliber launcher, and the interaction between launch barrel and the other parts is also studied.

Dynamic Simulation for Driver-Tricycle-Road System with Rigid-Flexible Coupling

2011 ◽  
Vol 421 ◽  
pp. 240-245
Author(s):  
Xiang Han
Keyword(s):  
Dynamic Simulation ◽  
Dynamic Theory ◽  
Dynamic Performance ◽  
Flexible Body ◽  
Tire Model ◽  
Performance Simulation ◽  
Flexible Coupling ◽  
The Road ◽  
Coupling Dynamic ◽  
Coupling Dynamic Model

Performance simulation for driver-tricycle-road hasn’t been reported currently. According to rigid-flexible coupling dynamic theory, this article took the frame and the spring as the spatial flexible body, used the UA tire model, considered the engine and the road surface drove, established tricycle rigid-flexible coupling dynamic model based on driver-tricycle-road environment and simulated its system modality, acceleration and brake dynamic characteristic. The simulation result indicated this tricycle has the good dynamic performance and the conclusion has the important project practical value.

Research on the Initial Disturbance of Vehicular Missile with System Vibration Analysis

2012 ◽  
Vol 625 ◽  
pp. 134-139 ◽  
Author(s):  
Chong Zhang ◽  
Yi Jiang
Keyword(s):  
Flow Field ◽  
Dynamic Simulation ◽  
Vibration Analysis ◽  
Jet Flow ◽  
Initial Disturbance ◽  
Flexible Coupling ◽  
Study Results ◽  
System Vibration ◽  
Coupling Dynamic ◽  
Coupling Dynamic Model

This paper is based on the complex multiple vehicular missile launch simulation model, researches the influence of combustion jet flow to the initial disturbance of missile. It establishes rigid-flexible coupling dynamic model by use of Adams and Ansys, and calculates the value of combustion jet flow field in missile box by means of Fluent. The rigid-flexible coupling dynamic simulation for the whole launch process is carried out. The study results show that the simulation with loading jet flow can accurately tend to real launch environment, it has great significance to optimize the simulation and to improve the accuracy of the simulation.

Research on the Laws of the Environmental Vibration Induced by Elevated Rail Transit

2013 ◽  
Vol 405-408 ◽  
pp. 1881-1886
Author(s):  
Luo Wei ◽  
Wang Ping ◽  
Yan Le ◽  
Liu Hao ◽  
Chen Rong
Keyword(s):  
Dynamic Model ◽  
Low Frequency ◽  
Rail Transit ◽  
Response Level ◽  
Low Frequency Vibration ◽  
Environmental Vibration ◽  
Vertical Ground ◽  
Coupling Dynamic ◽  
Coupling Dynamic Model ◽  
Element Method

Established the Car Line - Bridge coupling dynamic model, then entered the actual parameters of train, track and bridge structural, obtained the dynamic excitation at the rail bridge pier bottom when the train passes. On this basis, established the pier - soil - building coupling dynamic model by combining finite element method and infinite boundary element method, analysed the vibration characteristics of soil and buildings surrounding the elevated rail way, brought an in-depth study to the effects of elevated rail transit train running on the environment. The results show that: 1)The the environmental vibration induced by elevated rail transit is low-frequency vibration, the vertical ground boils down to low-frequency vibration of 10 - 25Hz, the transverse vibration of housing column is fundamental frequency vibration near 10Hz, the vertical floor boils down to low-frequency vibration of 10 - 25Hz. 2) The vertical ground vibration response level decreases with the increase of distance to the rail centerline when the train passes. 3) With the increase of vibration wave propagation distance, components of higher frequency decay more quickly.

Rigid–flexible coupling dynamics analysis with joint clearance for a 5-DOF hybrid polishing robot

Robotica ◽  
2021 ◽  
pp. 1-21
Author(s):  
Feng Guo ◽  
Gang Cheng ◽  
Shilin Wang ◽  
Jun Li
Keyword(s):  
Dynamic Model ◽  
Parallel Manipulator ◽  
Dynamic Properties ◽  
Dynamic Performance ◽  
Joint Clearance ◽  
Motion Error ◽  
Flexible Coupling ◽  
Coupling Dynamic ◽  
Equivalent Load ◽  
Coupling Dynamic Model

SUMMARY Considering the polishing requirements for high-precision aspherical optical mirrors, a hybrid polishing robot composed of a serial–parallel manipulator and a dual rotor grinding system is proposed. Firstly, based on the kinematics of serial components, the equivalent load model for the parallel manipulator is established. Then, the elastodynamic model of kinematic branched-chains of the parallel manipulator is established by using the spatial beam element, and the rigid–flexible coupling dynamic model of the polishing robot is obtained with Kineto-elasto dynamics theory. Further, considering the dynamic properties of the joint clearance, the rigid–flexible coupling dynamic model with the joint clearance for the polishing robot is established. Finally, the equivalent load distribution of the parallel manipulator is analyzed, and the effect of the branched-chain elasticity and joint clearance on the motion error of the polishing robot is studied. This article provides a theoretical basis for improving the motion accuracy and dynamic performance of the hybrid polishing robot.

Vibration analysis of a flexible gearbox system considering a local fault in the outer ring of the supported ball bearing

2020 ◽  
pp. 107754632093688
Author(s):  
Jing Liu ◽  
Lei Yuan
Keyword(s):  
Dynamic Model ◽  
Transmission System ◽  
Gear Transmission ◽  
Ball Bearings ◽  
Transmission Characteristics ◽  
Flexible Coupling ◽  
Flexible Shaft ◽  
Gear Transmission System ◽  
Coupling Dynamic ◽  
Coupling Dynamic Model

Ball bearings are key components in the gear transmission system. Supported ball bearings have great influences on the vibrations of the gear transmission system, especially the presence of the local faults. Although some reported works formulated the local fault in the supported bearings of the gear transmission system, the box and shaft were considered as rigid bodies. To overcome this problem, a rigid-flexible coupling dynamic model for a flexible gearbox with the supported ball bearings is developed, which cannot be described by the previous multibody models. The local fault in the supported bearing is described by a time-varying impact force model with a half-sine profile. The bearing clearance, flexible shaft, and box are considered in the rigid-flexible coupling dynamic model. The flexible shaft and box are formulated by a finite element method. The damping and contact stiffness in the bearings and gears are obtained by the previous methods in the listed works. The frictions between the mating components are formulated by the Coulomb friction model. An experimental study is applied to validate the rigid-flexible coupling dynamic model. The effects of the faults on the vibration transmission characteristics are investigated. The results provide that the local fault in the supported bearings will greatly affect the vibrations of the gearbox system. Moreover, it depicts that the vibration collection point for the defective bearings should be located at the same side to obtain better singles. This work can provide a more reasonable method for understanding the vibration transmission characteristics of the gearbox system with the local faults in the supported bearings than the reported multibody models.

scholarly journals Dual Nozzle Weapon Power Couple Vibration Controller With Delayed Rear Nozzle

2021 ◽  
Vol 2125 (1) ◽  
pp. 012034
Author(s):  
Xiong Chen ◽  
Ming Qiu ◽  
Jie Song ◽  
Longxu Ma ◽  
Zhenqiang Liao
Keyword(s):  
Numerical Simulation ◽  
Phase Flow ◽  
Two Phase ◽  
Flexible Coupling ◽  
External Injection ◽  
Coupling Dynamic ◽  
Power Couple ◽  
A Chain ◽  
Coupling Dynamic Model ◽  
Couple Vibration

Abstract Aiming at the problem that the firing accuracy of barrel weapon is affected by the violent vibration during continuous firing, a double-nozzle vibration controller using the energy of gunpowder gas in the chamber is proposed. The synchronous external injection of the double nozzles of the controller is realized by the delayed ejection of the rear nozzles, so as to generate a power couple to balance the recoil flipping torque of the barrel weapon to achieve the stable firing effect of reducing the bore vibration. A double-nozzle vibration controller with a delayed rear nozzle for a chain gun is designed. The rigid-flexible coupling dynamic model of a chain gun with a double-nozzles vibration controller was established considering the two-phase flow of propellant gas in the barrel and airway. The numerical simulation of the muzzle vibration characteristics of the original weapon and a chain gun equipped with a double-nozzles vibration controller is carried out respectively, and the effectiveness of the double-nozzles dynamic couple vibration controller for the continuous firing vibration control of the barrel weapon is verified.

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