Dynamic effect of the non-rigid modified bicycle model

Abstract

Abstract

In this paper a method to add elastic effects to the classic ‘bicycle model’ for the simulation of the dynamic behaviour of vehicles is presented. The obtained results show that, in the simulations, dynamic effects such as lateral acceleration are more severe when non-rigid models of the vehicle frame are used. This work demonstrates that the modified bicycle model is a useful instrument to predict the response of a vehicle. At present, much effort is dedicated to simulation with rigid body dynamic programs. The proposed method offers an easy way to evaluate the dynamic effects in models with flexible frames. The elasticity of the frame has an important impact on the directional response (yaw gain and lateral velocity) of the vehicles. This method is useful for analysis from the behaviour of vehicles with modifications made after their manufacture. In the design phase the manufacturer has the suitable tools and the experience to avoid designing frames of low rigidity. Nevertheless, in the second-hand market it is very common for trucks and their structure to be modified. The change in rigidity of the frame could have considerable effects on directional stability and handling.