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.

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.

scholarly journals Complex Bogie Modeling Incorporating Advanced Friction Wedge Components

2009 ◽  
Author(s):  
Brian Sperry ◽  
Corina Sandu ◽  
Brent Ballew
Keyword(s):  
Dynamic Behavior ◽  
Degrees Of Freedom ◽  
Model Simulation ◽  
Surface Friction ◽  
Rigid Bodies ◽  
Operating Conditions ◽  
Normal Operation ◽  
Contact Points ◽  
Modeling Software ◽  
Simulation Results

This research focuses on the dynamic behavior of the three-piece bogie that supports the freight train car bodies. While the system is relatively simple, in that there are very few parts involved, the behavior of the bogie is somewhat more complex. Our research focuses primarily on the behavior of the friction wedges under different operating conditions that are seen under normal operation. The Railway Technologies Laboratory (RTL) at Virginia Tech has been developing a model to better capture the dynamic behavior of friction wedges using 3-D modeling software. In previous years, a quarter-truck model, and half-truck variably damped model have been developed using MathWorks MATLAB®. This year, research has focused on the development of a half-truck variably damped model with a new (curved surface) friction wedge, and a half-truck constantly damped model, both using the MATLAB® based software program. Currently a full-truck variably damped model has been created using LMS Virtual.Lab. This software allows for a model that is more easily created and modified, as well as allowing for a much shorter simulation time, which became a necessity as more contact points, and more complex inputs were needed to increase the accuracy of the simulation results. The new model consists of seven rigid bodies: the bolster, two sideframes, and four wedges. We have also implemented full spring nests on each sideframe, where in previous models equivalent spring forces were used. The model allows six degrees-of-freedom for the wedges and bolster: lateral, longitudinal, and vertical translations, as well as pitch, roll, and yaw. The sideframes are constrained to two degrees-of-freedom: vertical and longitudinal translations. The inputs to the model are vertical and longitudinal translations or forces on the sideframes, which can be set completely independent of each other. The model simulation results have been compared with results from NUCARS®, an industrially-used train modeling software developed by the Transportation Technology Center, Inc. (TTCI), a wholly owned subsidiary of the Association of American Railroads (AAR), for similar inputs, as well as experimental data from warping tests performed at TTCI.

Research of Amplification Frame Optimization Based on Optistruct

2012 ◽  
Vol 510 ◽  
pp. 541-544
Author(s):  
Bing Zhong
Keyword(s):  
Stress Distribution ◽  
Structural Optimization ◽  
Working Conditions ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Body Dynamics ◽  
Utilization Ratio ◽  
Simulation Results ◽  
The Cost ◽  
Multi Body

The motion of amplification frame of dumper was simulated by multi-body dynamics simulation software ADAMS, and the danger working conditions of amplification frame were calculated. The stress of amplification frame was simulated and analyzed by Optistruct software. The results show that the stress distribution in amplification frame is not uniform and it is big in the middle and small in the edge zeros. The structure of amplification is optimized according to the simulation results. The utilization ratio of the material increases and the cost of production decreases after structural optimization.

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.

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.

Design of a miniature modular inchworm robot with an anisotropic friction skin

Robotica ◽  
2018 ◽  
Vol 37 (3) ◽  
pp. 521-538 ◽  
Author(s):  
Wael Saab ◽  
Peter Racioppo ◽  
Anil Kumar ◽  
Pinhas Ben-Tzvi
Keyword(s):  
High Frequency ◽  
Experimental Validation ◽  
Anisotropic Friction ◽  
Confined Spaces ◽  
Model And Simulation ◽  
Body Dynamics ◽  
Two Generations ◽  
Simulation Results ◽  
Multi Body ◽  
Friction Analysis

SUMMARYThis paper presents the design, analysis, and experimental validation of a miniature modular inchworm robot (MMIR). Inchworm robots are capable of maneuvering in confined spaces due to their small size, a desirable characteristic for surveillance, exploration and search and rescue operations. This paper presents two generations of the MMIR (Version 1—V1 and Version 2—V2) that utilize anisotropic friction skin and an undulatory rectilinear gait to produce locomotion. This paper highlights design improvements and a multi-body dynamics approach to model and simulate the system. The MMIR V2 incorporates a slider-crank four-bar mechanism and a relative body revolute joint to produce high-frequency relative translation and rotation to increase forward velocity and enable turning capabilities. Friction analysis and locomotion experiments were conducted to assess the systems performance on various surfaces, validate the dynamic model and simulation results, and measure the maximum forward velocity. The MMIR V1 and V2 were able to achieve maximum forward velocities of 12.7 mm/s and 137.9 mm/s, respectively. These results are compared to reported results of similar robots published in the literature.

Handling Stability Performance Simulation and Analysis of Three Different Vehicle Models

2010 ◽  
Vol 29-32 ◽  
pp. 750-755
Author(s):  
Shu Feng Wang ◽  
Hua Shi Li ◽  
Cui Hua He
Keyword(s):  
Lateral Acceleration ◽  
Dynamics Model ◽  
Vehicle Model ◽  
Performance Simulation ◽  
Vehicle Handling ◽  
Stability Performance ◽  
Body Dynamics ◽  
Nonlinear Vehicle Model ◽  
Simulation Results ◽  
Multi Body

In order to obtain accurate vehicle handling stability performance, 2 DOF nonlinear vehicle model and multi-body dynamics vehicle model are established. Selecting the same vehicle parameters, step steering angle input simulations of three vehicle model (include 2DOF linear vehicle model) are carried out under the same driving conditions, simulation results are analyzed and compared. The simulation results show that 2DOF linear model can characterize the steering states of vehicle when vehicle lateral acceleration is small, but when vehicle lateral acceleration is big, Nonlinear vehicle model and multi-body dynamics model is accurate.

Dynamics Simulation of Diesel Engine Piston pin Based on ADAMS and its Application in Fault Diagnosis

2011 ◽  
Vol 308-310 ◽  
pp. 1860-1864
Author(s):  
Hai Bing Xiao ◽  
Xiao Peng Xie
Keyword(s):  
Fault Diagnosis ◽  
Diesel Engine ◽  
Dynamics Simulation ◽  
Fast Fourier Transformation ◽  
Engine Piston ◽  
Power Spectral ◽  
Body Dynamics ◽  
Piston System ◽  
Simulation Results ◽  
Multi Body

In this paper, ADAMS multi-body dynamics simulation was introduced in order to solve the diesel engine piston pin dynamics. Take diesel engine piston for example, the model of piston system was established based on ADAMS/Engine module. According to rotational speed of crankshaft, piston pin dynamics simulation was analyzed. Through Fast Fourier Transformation, piston pin power spectral density was got for piston pin fault diagnosis. The results show that simulation results are consistent with theory, dynamics simulation applied in fault diagnosis is feasible.

Model Establishment and Simulation of Vehicle Handling Stability Using Adams/Car

2012 ◽  
Vol 472-475 ◽  
pp. 2152-2155
Author(s):  
Jie Meng ◽  
Kai Zhang ◽  
Bao Cheng Yang
Keyword(s):  
Lane Change ◽  
Vehicle Model ◽  
Simulation Test ◽  
Vehicle Handling ◽  
Adams Software ◽  
Body Dynamics ◽  
Constant Radius ◽  
Design Plan ◽  
Simulation Results ◽  
Multi Body

A vehicle model is built using the multi body dynamics software-ADAMS/ Car first. And then the vehicle’s performance of the constant radius cornering and ISO lane change is simulated. According to the simulation results, the handling stability is evaluated. The result shows that the ADAMS software can provide accurate simulation test and optimize the design plan of vehicle product.

Research on Dynamic Balance of Linkage Considering the Influence of Elastic Deformation Based on Simulation

2012 ◽  
Vol 217-219 ◽  
pp. 1465-1470
Author(s):  
Qi Bing Li ◽  
Yu Huang
Keyword(s):  
Objective Function ◽  
Elastic Deformation ◽  
Dynamic Balance ◽  
Three Dimensional ◽  
Geometrical Shape ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Body Dynamics ◽  
Modeling Software ◽  
Multi Body

A method based on mechanical kinetics, Virtual Prototype technology and Finite Element Method (FEM) is proposed, aiming at the dynamic balance of planar linkage with elastic deformation. The method applies to the situation that the elastic deformation of the components can’t be neglected. Translate the key components to flexible bodies by FEM; Build the rigid-flexible multi-body dynamics model by dynamic analysis software, and synthetically optimize the dynamic balance of the model by using the comprehensive indicator which includes input torque, shaking force and moment as the objective function; Finally, according to the parameter result of the previous optimization, the component’s geometrical shape was designed in three-dimensional modeling software. Taking a kind of crank-slide mechanism as an example, it uses this method to optimize a crank-slide mechanism’s dynamic balance and to make the objective function value declined by about 9.2%. The mechanism’s vibration characteristic is improved, so the method is proved to be practical and effective.

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