The Research of Vehicle Handling Stability Based on ADAMS

2011 ◽  
Vol 127 ◽  
pp. 248-251
Author(s):  
Qiu Fang Zhao ◽  
Tao He ◽  
Wen Juan Xu ◽  
Zhi Qiang Liu
Keyword(s):  
High Performance ◽  
Simulation Software ◽  
Service Performance ◽  
Dynamics Simulation ◽  
Positive Zero ◽  
Vehicle Model ◽  
Simulation Test ◽  
Vehicle Handling ◽  
Vehicle Simulation ◽  
Design Time

With the demand for the high performance, the vehicle handling stability is more and more attractive and becomes one main service performance of modern car. At the same time, traditional calculation method can not meet the requirement of modern automobile research on the analysis of varied performances. The virtual simulation software increases greatly and it is possible to do the vehicle simulation trial. In this paper, a vehicle model of 10-DOF is built by using the dynamics simulation software ADAMS. Through the dynamic simulation test, the vehicle handling stability is studied with emphasis when the S.M. (Static Margin) is positive,zero or negative.The result is a reference in design of the vehicle, so the purpose of saving test funds and shortening design time is achieved.

Estimating Pacejka (PAC2002) Tire Coefficients for Pneumatic Tires on Soft Soils With Application to BAJA SAE Vehicles

2019 ◽  
Author(s):  
Amanda Saunders ◽  
Darris White ◽  
Marc Compere
Keyword(s):  
Vehicle Dynamics ◽  
Integration Method ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Road Vehicles ◽  
Traction Forces ◽  
Soft Soils ◽  
Vehicle Performance ◽  
Vehicle Simulation ◽  
Stress Integration

Abstract BAJA SAE is an engineering competition that challenges teams to design single-seat all-terrain vehicles that participate in a vast number of events, predominately on soft soils. Efficient performance in the events depends on the traction forces, which are dependent on the mechanical properties of the soil. To accurately model vehicle performance for each event, a model of the tire traction performance is required, and the tire model must be incorporated with a vehicle dynamics simulation. The traction forces at the soil-tire interface can be estimated using the Bekker-Wong stress integration method. However, commercially available vehicle dynamics simulation software, with a focus on on-road vehicles, does not utilize Bekker-Wong parameters. The Pacejka Magic Tire (MT) Formula is a common method for characterizing tire behavior for on-road vehicles. The parameters for the Pacejka MT Formula are usually produced by curve fitting measured tire data. The lack of available measured off-road tire data, as well as the additional variables for off-road tire performance (e.g. soil mechanics), make it difficult for BAJA SAE teams to simulate vehicle performance using commercial vehicle simulation tools. This paper discusses the process and results for estimating traction performance using the Bekker-Wong stress integration method for soft soils and then deriving the Pacejka coefficients based on the Bekker-Wong method. The process will enable teams to use the Pacejka Magic Tire Formula coefficients for simulating vehicle performance for BAJA SAE events, such as the hill climb, (off-road) land maneuverability, tractor pull, etc.

Lateral Stability Control Design for Tractor Semitrailer Based on Virtual Prototyping

2010 ◽  
Vol 118-120 ◽  
pp. 728-732
Author(s):  
Shu Wen Zhou ◽  
Si Qi Zhang ◽  
Guang Yao Zhao
Keyword(s):  
High Speed ◽  
Virtual Prototyping ◽  
Control Design ◽  
Stability Control ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Lateral Stability ◽  
Analysis Model ◽  
Vehicle Model ◽  
Yaw Rate

Tractor semitrailers on high speed obstacle avoidance under emergency are likely to arise rollover or jack-knifing, which are serious risks for motorists. A dynamic stability analysis model of a three-axle tractor semitrailer vehicle is developed using the application tool. The linearized vehicle model is utilized to predict the dynamics state of the tractor semitrailer built in multibody dynamics simulation software. The lateral stability simulation for yaw rate following and anti-rollover has been performed on the dynamic model based on virtual prototyping. The results show that the lateral stability control based on tractor semitrailer proposed in this paper can stabilize the tractor semitrailer, rollover and jack-knifing can be prevented to a large extent.

scholarly journals Optimisation of polynomial railway transition curves of even degrees

2015 ◽  
Vol 35 (3) ◽  
pp. 71-86 ◽  
Author(s):  
Krzysztof Zboiński ◽  
Piotr Woźnica
Keyword(s):  
Simulation Software ◽  
Lateral Acceleration ◽  
Vehicle Body ◽  
Railway Vehicle ◽  
Vehicle Model ◽  
Vehicle Simulation ◽  
Optimisation Methods ◽  
Advanced Model ◽  
Transition Curves

This paper represents new results obtained by its authors while searching for the proper shape of polynomial railway transition curves (TCs). The search for the proper shape means the evaluation of the curve properties based on chosen dynamical quantities and generation of such shape with use of mathematically understood optimisation methods. The studies presented now and in the past always had got a character of the numerical tests. For needs of this work advanced vehicle model, dynamical track-vehicle and vehicle-passenger interactions, and optimisation methods were exploited. In this software complete rail vehicle model of 2-axle freight car, the track discrete model, and non-linear description od wheel-rail contact are used. That part of the software, being vehicle simulation software, is combined with library optimisation procedures into the final computer programme. The main difference between this and previous papers by the authors are the degrees of examinated polynomials. Previously they tested polynomial curves of odd degrees, now they focus on TCs of 6th, 8th and 10th degrees with and without curvature and superelevation ramp tangence in the TC’s terminal points. Possibility to take account of fundamental demands (corresponding values of curvature in terminal points) concerning TC should be preserved. Results of optimisation are compared both among themselves and with 3rd degree parabola. The aim of present article is to find the polynomial TCs’ optimum shapes which are determined by the possible polynomial configurations. Only one dynamical quantities being the results of simulation of railway vehicle advanced model is exploited in the determination of quality function (QF1). This is: minimum of integral of vehicle body lateral acceleration.

The Influences on Turnout Dynamic Responses due to its Irregularities

2011 ◽  
Vol 105-107 ◽  
pp. 1181-1186 ◽  
Author(s):  
Yang Cao ◽  
Wang Ping ◽  
Wei Hua Zhao ◽  
Cai You Zhao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Response ◽  
Structure Design ◽  
Simulation Software ◽  
Dynamic Responses ◽  
Dynamics Simulation ◽  
Combined Effects ◽  
Vehicle Model ◽  
The Stability

A vehicle model and a movable-point simple turnout model were established, and the influences on dynamic responses caused by turnout irregularities when train passes through No.18 turnout was analyzed by using the turnout dynamics simulation software based on finite element method. It shows that turnout dynamic responses are influenced by the combined effects of various types of irregularities, which produce bigger dynamic response than single irregularity. In the turnout devise and use, the distance between slide plate and switch rail or nose rail should be as close as possible, the position arrangements of traction points should be optimized and the insufficient displacement should be eliminated as much as possible; No.18 turnout structure design is reasonable, which can ensure the safety and the stability when train passes over turnout.

A Full Vehicle Model for the Development of a Variable Camber Suspension

2007 ◽  
Author(s):  
Isao Kuwayama ◽  
Fernando Baldoni ◽  
Federico Cheli
Keyword(s):  
Simulation Models ◽  
Dynamics Simulation ◽  
Tire Model ◽  
Electronic Components ◽  
Vehicle Model ◽  
Active Systems ◽  
Additional Degree ◽  
Vehicle Simulation ◽  
Full Vehicle ◽  
Multi Body

The accuracy of the recent vehicle dynamics simulation technology, represented by Multi-Body Simulations along with reliable tire models, has been remarkably progressing and provides reasonable simulation results not only for conventional passive vehicles but also for advanced active vehicles equipped with electronic components; however, when it comes to advanced vehicle applications with complex active systems, the complexity causes a longer simulation time. On the other hand, even though simple numerical vehicle simulation models such as single-track, two-track and a dozen degrees of freedom (dofs) models can provide less information than those of multi-body models, they are still appreciated by specific applications particularly the ones related to the development of active systems. The advantages of these numerical simulation models lie in the simulation platform, namely the Matlab/Simulink environment, which is suitable for modeling electronic components. In this paper, an 18 dofs vehicle model has been proposed for the development of a type of active suspension named Variable Camber which has an additional degree of freedom in camber angle direction and a description of the models and some preliminary results are reported: the control strategy for the variable camber suspension will be published ([3]). The model can reproduce a passive vehicle with a passive suspension as well; all the necessary dimensions, parameters, and physical properties are derived from a specific multi-body full vehicle model which has been fully validated with respect to a real one on the track. As for a tire model, Magic Formula 5.2 has been implemented on both the numerical and the multi-body vehicle models respectively so that the same tire model can be applied.

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.

Virtual Validation and Verification Method of Brake System Model

2014 ◽  
Vol 1056 ◽  
pp. 177-181
Author(s):  
Liang Xu ◽  
Rui Guo ◽  
Xiao Liu
Keyword(s):  
Mixed Model ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
System Model ◽  
Brake System ◽  
Vehicle Model ◽  
Operation Condition ◽  
Test Environment ◽  
Validation And Verification ◽  
Verification Method

Model validation needs effective and efficient after development of the brake model. For the relatively high cost and limited coverage of test condition of the experimental verification, a virtual test environment of the brake system is established by using the vehicle model and the graphical interface of mature vehicle dynamics simulation software Carsim. Firstly, the brake system model is encapsulated into a dynamic link library. Then the new brake model according to the relationship between input and output of the brake system and vehicle through the S-function is integrated with Carsim vehicle model in Matlab/Simulink, replacing the Carsim brake model. Finally, the mixed model is verified though comparing with Carsim vehicle model in the same operation condition. The simulation results show that the validation and verification method are effective and low cost.

Study of Airport Crash Fire Vehicle Dynamics Simulation Model

2011 ◽  
Vol 121-126 ◽  
pp. 2268-2273
Author(s):  
Li Wen Wang ◽  
Da Meng Yuan ◽  
Hao Wang
Keyword(s):  
Dynamics Simulation ◽  
Dynamics Model ◽  
Fire Control ◽  
Training Simulator ◽  
Simulation Test ◽  
Vehicle Simulation ◽  
Test Platform ◽  
System Module ◽  
Vehicle Test ◽  
Real Vehicle

By using forward modeling and backward modeling synthetically, a dynamics model, including engine module, powertrain module, fire control system module and velocity module, is established preliminarily for airport crash fire vehicle training simulator. Simulation is performed in the airport crash fire vehicle simulation test platform. Finally real vehicle test is carried on. By contrasting simulation with experiment result, it is concluded that the dynamics model is reasonable and feasible and could satisfy the need of airport crash fire vehicle training simulator.

Optimization of Suspension Roll Center Height for Vehicle Handling Stability

2011 ◽  
Vol 130-134 ◽  
pp. 2198-2202
Author(s):  
Liang Zhang ◽  
Qi Dong Wang ◽  
Li Hong Zhu ◽  
Kai Jie Luo
Keyword(s):  
Simulation Software ◽  
Steering Wheel ◽  
Vehicle Model ◽  
Vehicle Handling ◽  
System Sensitivity ◽  
Air Suspension ◽  
Center Position ◽  
Multi Body ◽  
The Relationship ◽  
Body Dynamic

Suspension roll characteristics are investigated using multi-body dynamic simulation software to analyze the handling stability of a coach air suspension system. Sensitivity analysis is applied to reveal the relationship between the guide mechanism geometry and roll center height of the suspension. The locations of V-pole mounts are adjusted to obtain a lower roll center position. The results of the steering wheel angle step input and steady-state circular tests are compared. To verify the effectiveness of vehicle model. Results indicate considerable improvement in handling stability, made possible by the low roll center height of the rear suspension.

scholarly journals Optimization of Polynomial Transition Curves from the Viewpoint of Jerk Value

2017 ◽  
Vol 63 (1) ◽  
pp. 181-199 ◽  
Author(s):  
K. Zboinski ◽  
P. Woznica
Keyword(s):  
Optimization Procedure ◽  
Optimization Methods ◽  
Simulation Software ◽  
Vehicle Model ◽  
Vehicle Simulation ◽  
Numerical Tests ◽  
Full Vehicle ◽  
Freight Car ◽  
Transition Curves ◽  
New Criteria

Abstract The aim of the presented paper is to show the results of shape optimization of railway polynomial transition curves (TCs) of 5th, 7th, and 9th degrees through the use of the full vehicle model and new criteria of assessement concerning the jerk value. The search for the proper shape of TCs means that in this work, the evaluation of TC properties is based on select quantities and the generation of such a shape through the use of mathematically understood optimization methods. The studies presented have got a character of the numerical tests. For this work, advanced vehicle models describing dynamical track-vehicle and vehicle-passenger interactions as well as optimization methods were exploited. In the software vehicle model of a 2-axle freight car, the track discrete model, non-linear descriptions of wheel-rail contact are applied. This part of the software, the vehicle simulation software, is combined with a library optimization procedure into the final computer program.

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