This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Influence of Shock Absorber Non-Linearities Over the Vehicle Dynamics Behaviour
Technical Paper
2014-36-0018
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Automotive industry has shown, in the recent years, a dramatically increase of competition at emergent markets. The incoming of new Brands, for example in the Brazilian market, is causing the OEMs to decrease costs while increase quality, which represents a big challenge nowadays.
In this challenging scenario, virtual simulation has become mandatory. While cutting costs since no physical prototypes are required, virtual models also reduces development time. Time to time, as computers processing capacity grows, virtual models are becoming more and more accurate, being able to capture even high non-linear phenomena, which ten years ago would not be feasible.
It is also known the natural tendency of vehicle dynamics engineers to develop shock absorber tuning only by means of subjective evaluation. Many reasons can be raised to this tendency, but one of them is the lack of representation of the entire shock absorber behavior in the virtual models. In this sense, the present work shows an attempt to capture the main non-linearities of shock absorbers that affect the most the vehicle behavior in terms of ride and handling. Two main effects are pointed out: shock absorber displacement dependency, especially for small and large wheel travels and time lag of response. A vehicle dynamics model was created using a functional model and validated against measured data. As functional simulation mode does not solve the multi-body equations for each integration step, it is still feasible to compute components non-linear behavior within the vehicle dynamics model without demanding too much simulation time. The addition of such phenomena in the damper model showed a better accuracy for the vehicle virtual model making it a better tool for development purposes for vehicle dynamics engineers. In this way, by enhancing the shock absorber model one aims the vehicle numerical model to help in the damper tuning process, reducing development time and improving efficiency in the car line vehicle project.
Recommended Content
Technical Paper | Shock Absorber Modeling and Experimental Testing |
Journal Article | Development and Implementation of a Warp Chassis Model |
Technical Paper | Tire Modeling for Misuse Situations |
Authors
Citation
Fernandes, C., Noguchi, E., Castro, R., and Almeida, U., "Influence of Shock Absorber Non-Linearities Over the Vehicle Dynamics Behaviour," SAE Technical Paper 2014-36-0018, 2014, https://doi.org/10.4271/2014-36-0018.Also In
References
- Hall , B. B. and Gill , K. F. Performance of a telescopic dual-tube automotive damper and implications for ride prediction Proc. IMechE, Part D: J. Automobile Engineering 1986 200 D2
- Allen* P J , Hameed A , and Goyder H Automotive damper model for use in multi-body dynamic simulations Proc. IMechE Vol. 220 Part D: J. Automobile Engineering 2006
- Karadayi , R. and Masada , G. Y. A nonlinear shock absorber model Proceedings of ASME Symposium on Simulation and Control of Ground Vehicles and Transportation Systems 7 12 December 1996 80 2
- Wallaschek , J. Dynamics of non-linear automobile shock-absorbers Int. J. Non-linear Mechanics 1990 25 2/3 299 308
- Fernandes , Claudio et al. Brake parameters influence over vehicle dynamics performance of an entry-level compact vehicle SAE Brakes Colloquium Brazil 2013