scholarly journals THE MECHANISM OF DRIVE SYSTEM FLEXIBLE SUSPENSION AND ITS APPLICATION IN LOCOMOTIVES

Transport ◽  
2013 ◽  
Vol 30 (1) ◽  
pp. 69-79 ◽  
Author(s):  
Yuan Yao ◽  
Hong-Jun Zhang ◽  
Shi-Hui Luo
Keyword(s):  
Degrees Of Freedom ◽  
Drive System ◽  
Dynamics Model ◽  
Dynamic Vibration Absorber ◽  
Bogie Frame ◽  
Suspension Parameters ◽  
Body Dynamics ◽  
Dynamic Performances ◽  
Drive Systems ◽  
Multi Body

The drive system flexibly suspended on the bogie frame is conducive to the lateral dynamic performances of locomotive. In order to clarify the mechanism and optimize the suspension parameters using this model, a bogie dynamics model with 10 degrees of freedom (including the drive system) was established. The lateral dynamic performances were analyzed with the different suspension parameters. The mechanism was determined from the dynamic vibration absorber and the best suspension frequency of the drive system was put forward. The multi-body-dynamics model with two types of drive systems was simulated in locomotives to verify this theoretical analysis. When the suspension frequency is close to the hunting motion frequency of the wheelset, the locomotive dynamics performed the best. The length of the swing rods at the front and rear drive systems were different on the same bogie, which improved the locomotive dynamic performances within a wider range of speed and the wheel conicity. The track shift forces of the locomotive were reduced by 45% and 34% respectively with the swing rods on the motor side and the non-motor side relative to the non-flexible suspension.

Modeling and Simulation of Motorcycle Ride Comfort Based on Bump Road

2010 ◽  
Vol 139-141 ◽  
pp. 2643-2647 ◽  
Author(s):  
Dong Mei Yuan ◽  
Xiao Mei Zheng ◽  
Ying Yang
Keyword(s):  
Degrees Of Freedom ◽  
Ride Comfort ◽  
Lagrange Equation ◽  
Equations Of Motion ◽  
Vertical Displacement ◽  
Dynamics Model ◽  
Body Dynamics ◽  
Space Formulation ◽  
Simulation Results ◽  
Multi Body

Through analyzing the motion when motorcycle runs on the bump road, the 5-DOF multi-body dynamics model of motorcycle is developed, the degrees of freedom include vertical displacement of sprung mass, rotation of sprung mass, vertical displacement of driver, and vertical displacement of front and rear suspension under sprung mass. According to Lagrange Equation, the differential equations of motion and state-space formulation are derived. Then bump road is simulated by triangle bump, and input displacement is programmed by MATLAB. With the input of bump road, motorcycle ride comfort is simulated, and the simulation results are verified by experiment results combined with two channels tire-coupling road simulator. It indicates that the simulation results and experiment results match well; the 5-DOF model has guidance for development of motorcycle ride comfort.

Dynamic model of an air spring and integration into a vehicle dynamics model

2008 ◽  
Vol 222 (10) ◽  
pp. 1813-1825 ◽  
Author(s):  
F Chang ◽  
Z-H Lu
Keyword(s):  
Dynamic Model ◽  
Vehicle Dynamics ◽  
Simulation Method ◽  
Heat Transfer Process ◽  
Spring Model ◽  
Dynamics Model ◽  
Air Spring ◽  
Full Vehicle ◽  
Body Dynamics ◽  
Multi Body

It is worthwhile to design a more accurate dynamic model for air springs, to investigate the dynamic behaviour of an air spring suspension, and to analyse and guide the design of vehicles with air spring suspensions. In this study, a dynamic model of air spring was established, considering the heat transfer process of the air springs. Two different types of air spring were tested, and the experimental results verified the effectiveness of the air spring model compared with the traditional model. The key factors affecting the computation accuracy were studied and checked by comparing the results of the experiments and simulations. The new dynamic model of the air spring was integrated into the full-vehicle multi-body dynamics model, in order to investigate the air suspension behaviour and vehicle dynamics characteristics. The co-simulation method using ADAMS and MATLAB/Simulink was applied to integration of the air spring model with the full-vehicle multi-body dynamics model.

A Study on the Influence of Sun Gear Misalignment on Planet Load Sharing and Lifetime of Planetary Gear Using MSC.ADAMS

2015 ◽  
Vol 743 ◽  
pp. 99-106 ◽  
Author(s):  
Kyung Min Kang ◽  
Peng Mou ◽  
D. Xiang ◽  
Gang Shen
Keyword(s):  
3D Model ◽  
Estimation Method ◽  
Planetary Gear ◽  
Load Sharing ◽  
Dynamics Simulation ◽  
Dynamics Model ◽  
Geometry Model ◽  
3D Geometry ◽  
Body Dynamics ◽  
Multi Body

Misalignment on sun gear in planetary gear is easily occurred and it usually causes serious problem of work efficiency and lifetime with the change of planet load sharing. For study on the influence of sun gear misalignment on load sharing, multibody dynamics simulation is employed in this paper. First of all, 3D geometry model of planetary gear is built by Solidworks. Based on 3D model, multi-body dynamics model of planetary gear is built by MSC.ADAMS and calculate meshing forces between sun gear and planet gears with each type of sun gear misalignment which are angular, radial and axial type. Based on this meshing force result, load sharing factor is calculated and the results of influence of each misalignment type to load sharing factor is obtained. Finally, gear lifetime is estimated by AGMA gear fatigue strength estimation method with load sharing factor. According to the results, radial misalignment is the most influence to load sharing factor and gear lifetime.

A Multibody Dynamics Approach to Friction Wedge Modeling for Freight Train Suspensions

2007 ◽  
Author(s):  
J. Steets ◽  
B. J. Chan ◽  
C. Sandu
Keyword(s):  
Degrees Of Freedom ◽  
Vertical Axis ◽  
Vertical Displacement ◽  
Unilateral Contact ◽  
Transient Dynamics ◽  
Normal Forces ◽  
Body Dynamics ◽  
Modeling Software ◽  
Simulation Results ◽  
Multi Body

This paper presents an effort to use multi-body dynamics with unilateral contact to model the friction wedge interaction with the bolster and the side frame. The new friction wedge model is a 3D, dynamic, stand-alone model of a bolster-friction wedge-side frame assembly. It allows the wedge four degrees of freedom: vertical displacement, longitudinal (between the bolster and the side frame) displacement, toe-in and toe-out, and yaw (rotation about the vertical axis). The dedicated train modeling software NUCARS® has been used to run simulations with similar inputs and to compare — when possible — the results with those obtained from the new stand-alone MATLAB friction wedge model. The stand-alone model shows improvement in capturing the transient dynamics of the wedge better. Also, it can predict not only normal forces going into the frame and bolster, but also use the associated moments to enhance model behavior. Significant simulation results are presented and the main differences between the current NUCARS® model and the new stand-alone MATLAB models are highlighted.

The Dynamics Analysis of a Multi-Stage Hybrid Planetary Gearing

2012 ◽  
Vol 538-541 ◽  
pp. 2631-2635
Author(s):  
Xin Tan ◽  
Yao Li ◽  
Jun Jie Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Gear Tooth ◽  
The Finite Element Method ◽  
Dynamics Model ◽  
Multi Stage ◽  
Body Dynamics ◽  
Multi Body ◽  
Rich Spectrum ◽  
Element Method

This paper introduces a complex multi-body dynamics model which is established to simulate the dynamic behaviors of a multi-stage hybrid planetary gearing based on the finite element method and the software ADAMS. The finite element method is used to introduce deformable ring-gears and sun-gears by using 3D brick units. A whole multi-body dynamics model is established in the software ADAMS. Mesh stiffness variation excitation and gear tooth contact loss are intrinsically considered. A rich spectrum of dynamic phenomena is shown in the multi-stage hybrid planetary gearing. The results show that the static strength of main parts of the gearing is strong enough and the main vibration and noises are excited by the dynamic mesh forces acting on the tooth of planet-gears and ring-gears.

The Analysis of Amphibious Vehicle Handling Stability Based on ADAMS/Car

2014 ◽  
Vol 1006-1007 ◽  
pp. 294-297 ◽  
Author(s):  
Zhi Ming Yan ◽  
Jian Jun Cai ◽  
Su Qin Qu ◽  
Fang Fang Zhai ◽  
An Rong Sun ◽  
...  
Keyword(s):  
Input Pulse ◽  
Suspension System ◽  
Dynamics Model ◽  
Vehicle Handling ◽  
Rear Suspension ◽  
Front Suspension ◽  
Stability Performance ◽  
Body Dynamics ◽  
Simulation Results ◽  
Multi Body

In this paper, a multi-body dynamics model of amphibious vehicle is established in terms of dynamic simulative software ADAMS/Car. The front and rear suspension system are studied and analyzed respectively. The handling stability performance of front suspension is simulated under step steering input, pulse steering input, steady turning, and meandered test in related to specifications. According to the simulation results, the handling stability of amphibious vehicle is evaluated objectively.

The Study of Elastic Dynamic of the Deployment Mechanism in Large Deployable Reflector

2013 ◽  
Vol 390 ◽  
pp. 246-250
Author(s):  
San Min Wang ◽  
Su Chen ◽  
Ru Yuan
Keyword(s):  
Elastic Deformation ◽  
Dynamic Properties ◽  
Rigid Body Dynamics ◽  
Dynamics Model ◽  
Satellite Antenna ◽  
Body Dynamics ◽  
Multi Body ◽  
Development Structure ◽  
Deployable Reflector ◽  
Method Analysis

The study regards the ETS-VIII satellite antenna unit deployment mechanism as object, uses multi-body dynamics theory as basement to build the rigid body dynamics model of the unit bodies, adopts the finite element method analysis of bending of elastic deformation of the linkage, to establish a unit elasticity of dynamics model and to research the components of flexible dynamic properties of the cell bodies of satellite antenna development. The result of the research shows that the flexibility of the component will lead to the elastic deformation of the cell bodies, in which beats significantly in the location of the maximum abduction, takes place in the deployment process. The research lies the foundation for the dynamic optimization of design of development structure.

Development of dynamic base model of a bogie suspended forwarder

2016 ◽  
Vol 231 (2) ◽  
pp. 357-371 ◽  
Author(s):  
Abbos Ismoilov ◽  
Ulf Sellgren ◽  
Kjell Andersson
Keyword(s):  
Simulation Model ◽  
Degrees Of Freedom ◽  
Dynamics Simulation ◽  
Whole Body ◽  
Rough Terrain ◽  
Tyre Model ◽  
Body Dynamics ◽  
Dynamic Simulation Model ◽  
Multi Body ◽  
Whole Body Vibrations

A forwarder is an off-road working machine that is used to transport logs from logging sites to a landing area that is accessible by trucks. Soil damage and operator comfort, especially whole-body vibrations when operating on hard and rough terrain, are crucial issues when developing novel forest machines. Most forwarders on the market are heavy machines with articulated steering and they are equipped with pairs of wheels mounted on bogies. For such bogie machines, only the flexibility and the dynamic dissipation in the tyres contribute to the “chassis damping”. The roll and lateral motions are the most severe components of the whole-body vibrations. So, developing new traction units, chassis suspensions and/or cabin suspension are in focus. Model-based design relies on focused models that are as simple as possible, but not too simple. This paper presents a 12 degrees-of-freedom multi-body dynamics simulation model of a standard eight-wheeled bogie type of medium-sized forwarder. The presented model is targeted for assessing and comparing different design solutions. It is shown that a configuration of seven rigid subsystems and eight flexible tyres represented with the simple and computer efficient Fiala tyre model enables the forwarder dynamic simulation model to be used to predict the roll and lateral motions of a forwarder operating on hard and rough terrain.

Study on Wheel-Rail Coupled Vibration of Metro with Co-Simulation of Finite Element Analysis and Multi-Body Dynamics Simulation

2015 ◽  
Vol 752-753 ◽  
pp. 636-641
Author(s):  
Wen Jing Sun ◽  
Dao Gong ◽  
Jin Song Zhou
Keyword(s):  
Finite Element ◽  
Dynamics Simulation ◽  
Track Structure ◽  
Coupled Vibration ◽  
Dynamics Model ◽  
Element Analysis ◽  
Modal Reduction ◽  
Body Dynamics ◽  
Flexible Track ◽  
Multi Body

Based on the multi-body dynamics theory and modal-reduction analysis, finite element method and multi-body dynamics were combined to establish the flexible track model. The rigid-flexible coupled dynamics model can reflect the features of coupled vibration accurately. When the flexibility of the rail, damping and stiffness of support layers under the rail are taken into consideration, the whole track structure acted as a buffer while wheel and rail is interacting with each other. Compared with rigid track model, the wheel-rail vibration is less in the flexible track model. The proposed method in this paper is simple and effective, which makes the calculation of vehicle-track dynamic response more convenient and quick.

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