The virtual tuning of an automatic shock absorber

2009 ◽  
Vol 223 (11) ◽  
pp. 2655-2662 ◽  
Author(s):  
W Ren ◽  
J Zhang ◽  
G Jin
Keyword(s):  
Vehicle Dynamics ◽  
Software Package ◽  
Shock Absorber ◽  
Simulation Method ◽  
Dynamics Model ◽  
Design Requirement ◽  
Damping Force ◽  
Detailed Model ◽  
Tuning Method ◽  
Full Vehicle

In automotive shock absorber development, tuning is a very important way to obtain the appropriate performance. Based on numerical simulation method and the MSC.ADAMS software package, a virtual tuning method has been developed for tuning the shock absorber inner valve set parameters to meet the damping force requirement. The first step is to build a detailed model of an automotive shock absorber using MSC.ADAMS/Hydraulics, while the model has been validated using test data and the accuracy is above 90 per cent. Then the validated model can be used for virtual tuning, in which the parameters can be changed and optimized so as to meet the design requirement and to obtain better performance. The shock absorber model can also be integrated into a full vehicle dynamics model, for some full vehicle level tuning. Based on the virtual tuning result, a physical tuning process is performed, which can be more effective and efficient.

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.

Design and multi-objective optimization of magnetorheological damper considering vehicle riding comfort and operation stability

2021 ◽  
pp. 1045389X2110482
Author(s):  
Zhaoxue Deng ◽  
Xinxin Wei ◽  
Xingquan Li ◽  
Shuen Zhao ◽  
Sunke Zhu
Keyword(s):  
Time Domain ◽  
Vehicle Dynamics ◽  
Mr Damper ◽  
Structure Parameters ◽  
Multi Objective Optimization ◽  
Dynamics Model ◽  
Damping Force ◽  
Domain Optimization ◽  
Operation Stability ◽  
The Time Domain

Mostly, magnetorheological (MR) dampers were optimized based on individual performance, without considering the influence of structure parameters change on vehicle performance. Therefore, a multi-objective optimization scheme of MR damper based on vehicle dynamics model was proposed. The finite element method was used to analyze magnetic flux density distribution in tapered damping channel under different structure parameters. Furthermore, the damping force expression of the tapered flow mode MR damper was derived, and the damping force was introduced into the vehicle dynamics model. In order to improve the ride comfort and operation stability of the vehicle, a collaborative optimization platform combining magnetic circuit finite element analysis and vehicle dynamics model was established. Based on this platform, the optimal design variables were determined by comfort and stability sensitivity analysis. The time domain optimization objective and frequency domain optimization objective are proposed simultaneously to overcome the lack of time domain optimization objective. The results show that compared with the time domain optimization and the initial design, the suspension dynamic deflection, tire dynamic load and vehicle body vertical acceleration are decreased after the time-frequency optimization. At the same time, in the frequency domain, the amplitude of vibration acceleration in each working condition is significantly reduced.

The Research on the Embedded Vehicle Dynamics Simulation Method

2013 ◽  
Vol 380-384 ◽  
pp. 1746-1749
Author(s):  
Jun Zhan ◽  
Jiang Li Lu ◽  
Liang Xu ◽  
Wei Zhang
Keyword(s):  
Real Time ◽  
Vehicle Dynamics ◽  
Subjective Evaluation ◽  
Simulation Method ◽  
Dynamics Simulation ◽  
Dynamics Model ◽  
The Real ◽  
Online Simulation ◽  
Preliminary Study ◽  
And Control

At present, the performance of the vehicle dynamics model is mainly evaluated objectively through offline simulation. In this paper, a vehicle dynamics model was implemented in dSPACE, which was applied to the Automotive Performance Simulator and the preliminary study was made for the realization of the subjective evaluation of the performance of vehicle dynamics model through the real-time closed-loop online simulation. The dSPACE interface library was used to write a Clib program to operate and control the Carsim RT model running on the dSPACE platform, which realized the communication between the external hardware and the real-time hardware of dSPACE.

Simulation Research for Self-Energizing Leveling Systems

2011 ◽  
Vol 211-212 ◽  
pp. 494-499
Author(s):  
Xiao Bin Ning ◽  
Cui Ling Zhao ◽  
Ji Sheng Shen
Keyword(s):  
Simulation Model ◽  
Shock Absorber ◽  
Simulation Method ◽  
Vehicle Model ◽  
Ride Height ◽  
Simulation Research ◽  
Vehicle Simulation ◽  
The Road ◽  
Full Vehicle ◽  
Internal Configuration

In order to decay vibration and recycle energy, the shock absorber that is self-energizing leveling systems was researched. The co-simulation method was adopted. A mathematical model for the shock absorber was built using the software MSC.EASY5, and the establishment of this model was based on the analysis of internal configuration and characteristics of valves. Debugging simulation of this model was also conducted. Vehicle simulation model was built using MSC.ADAMS. The assembly between vehicle simulation model and the shock absorber was realized through co-simulation between ADAMS/CAR and MSC.EASY5. After the integration of the full vehicle model the road test simulation with the input of random road surface signal was conducted. The simulation results shows that self-energizing leveling systems can partly recycle this energy which can be used to adjust ride height due to load change of automobile. This shock absorber is improving the ride performance of vehicle.

A non-linear vehicle dynamics model for accurate representation of suspension kinematics

2014 ◽  
Vol 229 (6) ◽  
pp. 1002-1014 ◽  
Author(s):  
Prashanth KR Vaddi ◽  
Cheruvu S Kumar
Keyword(s):  
Vehicle Dynamics ◽  
Degrees Of Freedom ◽  
Normal Force ◽  
Dynamics Model ◽  
Vehicle Model ◽  
Handling Performance ◽  
Suspension Spring ◽  
Full Vehicle ◽  
Non Linear ◽  
Dynamics Models

A non-linear full vehicle model for simulation of vehicle ride and handling performance is proposed. The model effectively estimates the suspension spring compressions, thus improving the accuracy of normal force calculations. This is achieved by developing models for suspension kinematics, which are then integrated with the commonly used 14 degrees of freedom vehicle dynamics models. This integrated model effectively estimates parameters like camber angles, toe angles and jacking forces, which are capable of significantly affecting the handling performance of the vehicle. The improvements in the accuracy of spring compressions help in simulating the effects of non-linear suspension elements, and the accuracy of handling simulation is enhanced by the improvements in normal force estimates. The model developed in Simulink is validated by comparing the results to that from ADAMS car.

scholarly journals MATHEMATICAL MODEL OF A SHIM VALVE OF A MONOTUBE SHOCK ABSORBER / VIENVAMZDŽIO AMORTIZATORIAUS PLOKŠTELINIO VOŽTUVO MATEMATINIS MODELIS

2016 ◽  
Vol 8 (5) ◽  
pp. 553-539
Author(s):  
Paulius Skačkauskas ◽  
Vaidas Vadluga ◽  
Vidas Žuraulis
Keyword(s):  
Mathematical Model ◽  
Material Properties ◽  
Software Package ◽  
Shock Absorber ◽  
Contact Forces ◽  
Damping Force ◽  
Matlab Simulink ◽  
Shock Absorbers

In the work, a mathematical model of a shim valve, used in monotube shock absorbers, designed to determine the deformations of the shims which form during the exploitation of the shock absorbers, is presented. The characteristic of the damping force formed by the shock absorber depends on the deformations. In the designed model, the amount, geometric dimensions, arrangement and the material properties of the shims are evaluated, and the contact forces, which form between the shims, are determined. The described model of the shim valve is presented in the environment of the software package MATLAB/Simulink, the analysis of the designed model is done using the software package ANSYS 15.0. Straipsnyje pateikiamas vienvamzdžiuose amortizatoriuose naudojamo plokštelinio vožtuvo matematinis modelis, skirtas vožtuvo plokštelių deformacijoms, susidarančioms eksploatuojant amortizatorių, nustatyti. Nuo deformacijų priklauso amortizatoriaus sukuriama slopinimo jėgos charakteristika. Sudarytame modelyje įvertinamas vožtuvo plokštelių skaičius, geometriniai matmenys, išdėstymas ir medžiagos sa-vybės, nustatomos kontaktinės jėgos, susidarančios tarp vožtuvo plokštelių. Aprašomasis plokštelinio vožtuvo modelis pateikiamas prog-raminio paketo MATLAB/Simulink aplinkoje, atliekama sudaryto modelio analizė naudojantis programiniu paketu ANSYS 15.0.

Double Adjustable Shock Absorbers Utilizing Electrorheological and Magnetorheological Fluids

2000 ◽  
Author(s):  
Jason E. Lindler ◽  
Norman M. Wereley
Keyword(s):  
Shock Absorber ◽  
Force Measurements ◽  
Damping Force ◽  
University Of Maryland ◽  
Shock Absorbers ◽  
Piston Head ◽  
Performance Requirements ◽  
Velocity Response ◽  
The University ◽  
Yield Force

Abstract Double adjustable shock absorbers allow for independent adjustment of the yield force and post-yield damping in the force versus velocity response. To emulate the performance of a conventional double adjustable shock absorber, an electrorheological (ER) and magnetorheological (MR) automotive shock absorber were designed and fabricated at the University of Maryland. For the ER shock absorber, an applied electric field between two tubular electrodes, located in the piston head, increases the force required for a given piston rod velocity. For the MR shock absorber, an applied magnetic field between the core and flux return increases the force required for a given piston rod velocity. For each shock absorber, two different shaped gaps meet the controllable performance requirements of a double adjustable shock absorber. A uniform gap allows for control of the yield force of the shock absorber, while a non-uniform gap allows for control of the post-yield damping. Force measurements from sinusoidal displacement cycles, recorded on a mechanical damper dynamometer, validate the performance of uniform and non-uniform gaps for adjustment of the yield force and post-yield damping, respectively.

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