scholarly journals Simulation of rail wheel axle bearing vibration due to local damages on outer races

2018 ◽  
Vol 233 (2) ◽  
pp. 429-440 ◽  
Author(s):  
Hongbin Liu ◽  
Ling Wang ◽  
Yunbin Li
Keyword(s):  
Dynamic Model ◽  
Three Dimensional ◽  
Simulation Software ◽  
Three Dimensional Model ◽  
Outer Race ◽  
Surface Damages ◽  
Bearing Vibration ◽  
Multi Body ◽  
Bearing Damage ◽  
Cylindrical Roller

This paper presents a dynamic model of bearings that simulates the vibration of rail wheel bearings due to local damages such as pits on the bearing outer race. The model, based on the multi-body simulation software RecurDyn, integrates the major parts of the functionalities according to the three-dimensional model and railway axle dynamic system. Three types of surface damages on the raceway of cylindrical roller bearings were designed and evaluated by the dynamic model developed in this study. The results show that the dynamic model can effectively simulate the influence of the damages on the bearing vibration under varied pit shape and size. Furthermore, the model can predict the level of bearing damage based on the peak value of bearing vibration in the frequency domain.

Obstacle Performance of Track Robot with Passive Rocker Based on Recurdyn

2013 ◽  
Vol 397-400 ◽  
pp. 1580-1588
Author(s):  
Man Lu Liu ◽  
Jing Zhang ◽  
Kuan Li
Keyword(s):  
Three Dimensional ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Prototype Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Kinematics Simulation ◽  
Body Dynamics ◽  
Set Up ◽  
Multi Body

To solve the instability of track robot in the process of climbing obstacles, a track robot with passive rocker was designed and a three-dimensional model of track robot was developed by Unigraphics NX in this paper. Furthermore, the kinematic analysis was made for obstacle performance of the track robot. The virtual prototype model of the track robot with passive rocker was set up by using the tracked vehicle subsystem of multi-body dynamics simulation software RecurDyn and kinematics simulation for this robot was made. The simulation results verify the feasibility of the machine and provide some theoretical guidance for developing the obstacle performance of track robot.

The Machine Design and Parameter Analysis of the Bar Bending which Based on the ADAMS

2015 ◽  
Vol 779 ◽  
pp. 84-87
Author(s):  
Xiao Qian Xia ◽  
Wei Min Dong ◽  
Jin Song Luo
Keyword(s):  
Damping Ratio ◽  
Three Dimensional ◽  
Simulation Software ◽  
Parameter Analysis ◽  
Dynamics Simulation ◽  
Three Dimensional Model ◽  
Optimization Analysis ◽  
Body Dynamics ◽  
Bending Mechanism ◽  
Multi Body

The three dimensional model of the bar bending mechanism was carried out by using the software Solidegde in this article,and then,import it into the multi-body dynamics simulation software Adams for the dynamic simulation and parameter optimization. Analysis results show that: The non-uniform stress phenomenon on the institutions must be effectively reduce under a appropriate damping ratio coefficient .

Finite-element analysis of multi-body contacts for pile driving using a hydraulic pile hammer

2011 ◽  
Vol 225 (5) ◽  
pp. 1153-1161 ◽  
Author(s):  
Y Guo ◽  
J P Hu ◽  
L Y Zhang
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Test Point ◽  
Pile Driving ◽  
Penalty Function Method ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Material Choice ◽  
Multi Body ◽  
The Impact

This article treats the pile driving as multi-body dynamic contacts. By using the penalty function method and three-dimensional model of finite-element method, the dynamic process of pile driving is acquired and a method for choosing the cushion material of the hydraulic pile hammer to improve driving efficiency is proposed. The process of pile driving in the real situation of an industrial experiment is simulated. The results of stress on test point are consistent with the test point. By analysing the stress distributed along the direction of pile radius and pile axis, the rule of the stress distribution on the pile is concluded. The rule for cushion material choice is obtained by comparing the influence for the impact stress with different elastic modulus ratio of the hammer cushion to the pile and the pile cushion to the pile.

Study of wind–vehicle–bridge system of suspended monorail during the meeting of two trains

2019 ◽  
Vol 22 (8) ◽  
pp. 1988-1997 ◽  
Author(s):  
Yu-long Bao ◽  
Huo-yue Xiang ◽  
Yong-le Li ◽  
Chuan-jin Yu ◽  
Yi-chao Wang
Keyword(s):  
Dynamic Model ◽  
Dynamic Method ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Aerodynamic Coefficients ◽  
Negative Contribution ◽  
Multi Body ◽  
Fluctuating Wind ◽  
Body Dynamic ◽  
Bridge System

Based on the theories of aerodynamics, bridge dynamics, and vehicle dynamics, the aerodynamic performances and the vibration characteristics of the wind–vehicle–bridge coupling system of two suspended monorail trains passing each other are analyzed. First, a wind model is presented with spectral representation method, the aerodynamic coefficients of bridge and vehicles before and after meeting are obtained through computational fluid dynamic method, and wind tunnel tests are conducted to verify the aerodynamic coefficients. Then, a vehicle dynamic model and a bridge dynamic model are established with the multi-body dynamic method and finite element method. Finally, a three-dimensional wind–vehicle–bridge coupled vibration model is established in this article using the multi-body dynamic software SIMPACK. The effects of average wind and fluctuating wind on the wind–vehicle–bridge system are studied. It is shown that the aerodynamic coefficients vary greatly under different combinations of vehicle–bridge system. The responses of the leeward vehicle change abruptly at the beginning and the end of the meeting of the two trains. And the mean wind speed has a great negative contribution to the acceleration of leeward vehicle. The lateral responses of suspended monorail vehicle are sensitive to the fluctuating wind. The roll angle of vehicle is presented for describing the running safety of the suspended monorail vehicles.

Vibration Analysis of a Coupled Multibody Dynamic Model of a Contact Mechanics Roller Rig

2016 ◽  
Author(s):  
Sajjad Z. Meymand ◽  
Mehdi Taheri ◽  
Milad Hosseinipour ◽  
Mehdi Ahmadian
Keyword(s):  
Dynamic Model ◽  
Contact Mechanics ◽  
Measurement System ◽  
Force Measurement ◽  
Virginia Tech ◽  
Simulation Software ◽  
Multibody Dynamic ◽  
Roller Rig ◽  
Force Measurement System ◽  
Multi Body

This study develops a detailed multi-body dynamic model of the Virginia Tech Roller Rig (VTRR) using multi body simulation software package SIMPACK. The Virginia Tech Roller Rig, a single-wheel roller rig with vertical plane roller configuration, is a state of the art testing fixture for experimental investigation of wheel-rail contact mechanics and dynamics. In order to have a better understanding of the dynamics at the contact, dynamic behavior and interaction of various components and subsystems of the rig need to be understood. In addition, it is essential to make sure that the measurements are only due to particular subject of study and not any intermittent source of disturbance. Any unwanted vibration at the contact needs to be compensated in the data measurements. To this end, a fully detailed model of the rig including all the components is developed in SIMPACK. The coupled multibody dynamic model represents all the major components of the rig and their interactions. The multibody dynamic model is employed for conducting noise, vibration, harshness (NVH) analysis of the rig. An Eigenvalue analysis provides the modal frequencies and mode shapes of the system. The modal analysis predicts the first natural frequency of the rig to be approximately 70 Hz, providing a relatively high bandwidth for evaluating the dynamics at the wheel-rail interface. Only dynamic that could have higher frequencies than the rig’s bandwidth is wheel-rail squeal. The model is also used to evaluate the performance of the contact force measurement system designed for the rig. The results show that the contact forces can be estimated precisely using the force measurement system.

Coupled Simulation Study on the Working Device of the Excavator Based on VL Motion

2012 ◽  
Vol 229-231 ◽  
pp. 1679-1683
Author(s):  
Shao Xun Jin ◽  
Hui Peng Chen ◽  
Guo Jin Chen
Keyword(s):  
Hydraulic System ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Coupled Simulation ◽  
Device Structure ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Multi Body ◽  
Working Device

On the foundation of analyzing the excavator’s working device structure, this paper built its three-dimensional model in Catia embedded in the VL Motion, created the bodies, defined the joints and corresponding drive interface to produce the multi-body dynamic model. According to the analysis on the hydraulic system of the working device, it built the electro-hydraulic system with the interface of Motion in AMEsim and then performed the coupled simulation between the Motion and AMEsim. Aiming at the working device’s performance defects, such as the worse displacement tracking, the slow respond, it designed the PID closed loop control system to improve the system’s performance. The simulation results show that the working device’s combination performance has been improved greatly, respond speed becomes fast and the ability of displacement tracking is better.

scholarly journals Automatic Generation of Locomotion Patterns for Soft Modular Reconfigurable Robots

2019 ◽  
Vol 10 (1) ◽  
pp. 294 ◽  
Author(s):  
Xin Sui ◽  
Hegao Cai ◽  
Dongyang Bie ◽  
Yu Zhang ◽  
Jie Zhao ◽  
...  
Keyword(s):  
Parametric Design ◽  
Three Dimensional ◽  
Structural Complexity ◽  
Automatic Generation ◽  
Simulation Software ◽  
Modular Robots ◽  
Simulation Platform ◽  
Modular Robot ◽  
Dimensional Simulation ◽  
Multi Body

In recent years, soft modular robots have become popular among researchers with the development of soft robotics. However, the absence of a visual 3D simulation platform for soft modular robots hold back the development of the field. The three-dimensional simulation platform plays an important role in the field of multi-body robots. It can shorten the design cycle, reduce costs, and verify the effectiveness of the optimization algorithm expediently. Equally importantly, evolutionary computation is a very effective method for designing the controller of multi-body robots and soft robots with hyper redundancy and large parametric design space. In this paper, a tradeoff between the structural complexity of the soft modular robot and computational power of the simulation software is made. A reconfigurable soft modular robot is designed, and the open-source simulation software VOXCAD is re-developed to simulate the actual soft robot. The evolutionary algorithm is also applied to search for the most efficient motion pattern for an established configuration in VOXCAD, and experiments are conducted to validate the results.

scholarly journals Curving Performance of Straddle-Type Monorail Vehicle with Single-Axle Bogies Based on Spatial Multi-Body Dynamic Analysis

Mechanika ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 148-154
Author(s):  
Du Zixue ◽  
Zhou Junchao ◽  
Yang Zhen ◽  
Xu Zhouzhou
Keyword(s):  
Dynamic Model ◽  
Spatial Dynamics ◽  
Three Dimensional ◽  
Urban Rail Transit ◽  
High Rate ◽  
Transit System ◽  
Urban Rail ◽  
Curving Performance ◽  
Multi Body ◽  
Vehicle Dynamic Model

Straddle-type monorail ,as a unique technology, energy saving and environmental protection, is different from the subway of urban rail transit system. In order  to study  the curving performance  of  a new type of the straddle-type monorail vehicle with single-axle bogies ,the three-dimensional spatial dynamics model which consists of the vehicle model and track model designis proposed by the multi-body dynamics soft ADAMS. The monorail vehicle dynamic model which consists of three types of tire -track contact model and the nonlinear model of the horizontal stop is established. Based on the dynamic model, the influences  such as pre pressure and curve super-high rate parameters of the curve passing for the dynamic characteristics are discussed. The simulation results show that the suitable preload for the guide and stabilizer tires of straddle-type vehicle with single-axle bogies is 5KN and after selecting the appropriate pre-pressure, the super-high rate is recommended to be 8%-10%.

Multiple Defects Detection in Outer Race of Gearbox Ball Bearing Using Time Domain Statistical Parameters

2016 ◽  
Vol 8 (3) ◽  
Author(s):  
A. Nabhan ◽  
A.M. Sami ◽  
M.O. Mousa ◽  
M. Nouby
Keyword(s):  
Ball Bearing ◽  
Three Dimensional ◽  
Simulated Data ◽  
Three Dimensional Model ◽  
Statistical Parameters ◽  
Outer Race ◽  
Multiple Defects ◽  
Single Defect ◽  
Deep Groove ◽  
Local Defects

Multiple defects are introduced on the outer race of vehicle gearboxes. The effect of the number of outer race defects in deep groove ball bearings are investigated using experimental and numerical methods. A three-dimensional model of the housing and outer race is developed using ABAQUS. Firstly, single defect located at 0˚and two defects located at 0˚ and 67.5˚ are analyzed. Then the number of defects was increased to three and the locations of the local defects are 0˚, 67.5˚ and 225˚. Finally the model with four defects located on the outer race at the angular positions 0˚, 67.5˚, 225˚ and 270˚, was investigated. The simulated data were also used to validate the experimental results.

A THREE DIMENSIONAL MODEL OF IDENTITY OF RELIGIOUSLY AFFILIATED SCHOOLS

2001 ◽  
Vol 2 (1) ◽  
pp. 1-26
Author(s):  
Chris A.M. Hermans
Keyword(s):  
Dynamic Model ◽  
Cultural Context ◽  
Three Dimensional ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Religiously Affiliated ◽  
Educational Aims

The author gives an outline for a dynamic model of identity of religiously affiliated schools. The model is composed of three dimensions: the different actors in the school, the educational aims, content and processes and the socio-cultural context that influences the first two dimensions. The dynamic in this model is caused by the interaction of the variables in the three dimensions. Against the background of this model, the contributions of this issue on identity are outlined.

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