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Simulation of Friction Induced Vibration Effects
Brake-Squeal Analysis with Ansys Mechanical and optiSLang

Simulation commissioned by ZF TRW

Branch : Automotive supplierSpecialist field: Structural mechanics, Scalability of simulations

The avoidance of NVH problems (noise, vibration and harshness) is of great importance in the development process. ZF TRW uses simulation to prevent these annoying noises.

Summary

Task

The task is to predict design problems leading to brake-squeal in advance.

Solution

Setup of a brake-squeal analysis with Ansys Mechanical and optiSLang

Customer benefits

This solution identifies designs that are prone to annoying brake squeal in the early development phase.

Project Details

Task

NVH problems consume significant design resources in engineering. Brake-squeal noise of a car is an important issue that strongly impacts customer satisfaction. The task is to predict design problems leading to brake-squeal in advance.


Solution

A prestressed complex modal analysis is deployed to account for the friction effects leading to mode coupling instability. The modal solution is based on a nonlinear contact analysis. Features like friction as a function of velocity or pressure, squeal damping, gyroscopic effects and mode tracking allow different physical effects to be accounted for within a robust solver.


Customer Benefit

This solutionidentifies designs that are prone to annoying brake squeal in the early development phase. Typically, friction coefficients, brake pressure and geometrical CAD parameters have to be varied within the automated closed loop process shown below to identify the sensitive parameters with respect to unstable modes. Robust Ansys CAD based meshing technology, together with its parametric approach and optimization based on optiSLang, play the key role to develop proper brake designs.


Head of Professional Development
Dr.-Ing. Marold Moosrainer

Products applied in the project