An Explanation for Brake Groan Based on Coupled Brake-Driveline System Analysis

Document Number: 2007-01-2260

Date Published: May 2007

Author(s):
Ashley Crowther - Ohio State Univ.
J. Yoon - Ohio State Univ.
Rajendra Singh - Ohio State Univ.

Abstract:
Brake creep-groan is studied via a friction-coupled torsional model consisting of driveline and brake sub-systems. The model captures the main torsional modes of interest while a suitable reduction of higher degree-of-freedom models allows selection of appropriate parameters. Numerical simulations are programmed that capture groan response with stick-slip friction and transient brake pressure. The vehicle is initially at rest and the groan may build into a steady state limit cycle, depending on the brake force actuation. For automatic transmission (AT) the driving torque is at the torque converter. For manual transmission (MT) the vehicle is on a slope and the driving torque is due to weight of the vehicle. On-vehicle tests provide time and frequency domain-measured accelerations for comparison.

File Size: 777K
Product Status: In Stock

Included in: V116-6

See other papers presented at SAE 2007 Noise and Vibration Conference and Exhibition, May 2007, St. Charles, IL, USA, Session: Vehicle Subsystem NVH: Brakes

Purchase more technical papers and save! With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay. Learn more >