This conference paper was submitted for presentation at the NAFEMS World Congress 2025, held in Salzburg, Austria from May 19–22, 2025.

Abstract

Multi body dynamics simulations including flexible bodies haves been performed for some time, but most of these flexible bodies are based on the mode synthesis method. Advances in analysis technology have made it possible to use flexible bodies that handle nodes directly. While mode synthesis flexible bodies can only be handled in the linear range, node-based flexible bodies have the advantage of being able to handle large deformations, nonlinear materials, and contacts. Furthermore, the ability to handle node-based flexible bodies has made it possible to apply it to other physical fields such as heat transfer and fluid dynamics, and the multiphysics of multi body dynamics analysis is progressing. This paper introduces an automobile disc brake model as an example of combining multi body dynamics analysis, structural analysis, and heat transfer analysis. Disc brake systems are currently installed in most automobiles and motorbikes. A disc brake system is a system that obtains deceleration force by using the frictional force generated by pressing the pads against the disc. However, when the disc and pads become hot due to the generation of frictional heat, problems occur in which the braking effect deteriorates. In addition, problems such as brake squeal can occur. Performing simulations to address such problems and predicting these physical conditions is extremely useful in design and development of the brake system. This analysis model consists of a brake disc and brake pads, and the brake pads are pressed against the rotating brake disc to generate friction force and decelerate the vehicle. The heat distribution and thermal deformation of the brake disc due to the frictional heat generated during this process were evaluated. These results show that it is now possible to evaluate all results, such as deformation, stress distribution, and temperature distribution of the disc during braking, in a single analysis using a single analytical model.