| As it has both the advantages of flat belt transmission form and V belt transmission from, the serpentine belt transmission form is widely applied to the engine front end accessory drive(EFEAD) system. Based on the analysis and summary of research at home and abroad, the major work of this paper can be summarized as the follows:1. A unified modeling method is proposed specifically. It includes the unified method to calculate the resultant moment on the tensioner pivot by the tensions of the two adjacent belt spans. Through classifying the pulleys and belt spans and providing their motion equations and tension calculation equation respectively, the unified equation group for all serpentine belt accessory drive system is given by combining them.2. A method to verify the system input paratmeters is developed. Based on the guarantee that the inputs are correct, a rotational vibration model dedicated to calculate steady response is set up, which has relatively small computational cost. To the dynamic response, the procedure to solve the developed unified equation group is presented by using the Runge-Kutta method. For accelerating the solving process, efficient methods for calculating tangent point coordinates between a belt and the adjacent pulleys and the belt length of contact arc on one pulley are put forward in the meantime.3. The unified modeling and solving method is validated by comparing the calculated vibration response of pulleys and belts with experiments. Furthermore, the commonality of the modeling method is verified by the calculation of different layout of SBADS with different types and numbers of tensioners.4. Software to calculate the rotational vibration response of SBADS is developed in the commonly used software development platform MATLAB. Combined with the calculation process of the dynamic response for a double automatic tensioner system, the window interfaces and the use method of software is shown respectively. |
PDF Full Text Request