Vehicle dynamics simulation is very common nowadays at any stage of chassis development which saves development time and cost. An Advanced Steering System Model has been developed and implemented in virtual environment to simulate steering characteristics and handling performance. In the vehicle measurement, it was found that the steering friction decreases when driven on uneven roads. As steering friction is an important steering characteristics related to steering centre feel, the Advanced Steering System Model should be able to produce accurate results for such phenomenon. The objective of this study is to validate the Advanced Steering System Model at different levels of road excitation. A steering system test bench was built up to realize the hardware-in-the-loop tests. In order to investigate the influence of the road excitation to the steering system friction, left and right rack forces were recorded on the test bench when the vehicle was driven on a virtual uneven road. These two signals were imposed to the steering rack force to simulate the random road excitation in vehicle measurements. The rack force with imposed noise leads to decreasing steering friction and increasing steering stiffness which conforms to the finding from on-vehicle measurements. Further effort has been made to characterize the influence of the road noise with constant frequency and amplitude displacement inputs on the test bench. The aforementioned test bench measurements were then used to validate the Advanced Steering Model. The Advanced Steering Model comprises mechanical module and power assist module. The advanced friction element in the mechanical module consists of an Exponential-Spring-Friction-Element and a parallel Hyperbolic-Tangent-Element. It represents the frequency and amplitude dependency of the steering system accurately with appropriately identified parameters. The friction model was identified with characteristic tests on the test bench. With the identified parameters, it achieves satisfactory agreement between measurement and simulation. The Advanced Steering Model is capable of representing the system response to the random road excitation, typically the friction reduction of the system due to the random noise input with appropriately identified parameters. It is intended to validate the model with higher frequency measurements so that the frequency range that influencing the system friction can be recognized.


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    Title :

    Modeling and simulation of steering shudder of electro-mechanical steering systems


    Contributors:


    Publication date :

    2013


    Size :

    18 Seiten, 16 Bilder, 1 Tabelle, 3 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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