There is a budding demand in the automotive industry for discovering the causes of brake judder and numerous mathematical models for analysis and simulation have been established. Since most of the data and knowledge are hidden within automobile manufacturers, it is still a mystery to unravel and get a clear picture. Judder was reported on the field during vehicle testing with a subjective assessment of Pad A (highlighted in table 1). The aim was to investigate the problem at the brake component by altering pad grades since it was within the scope of the study. Therefore, to save the time of running the vehicles and keeping the least variables from the 4M (Material, Method, Machine, Man), 8 combinations of friction pads were taken on an inertia brake dynamometer and deals with judder arising from the disk brake assembly only. This paper provides a novel approach by running various permutations and combinations of friction pads and interlinking caliper vibrations with the factors such as Brake torque variation (BTV), disc thickness variation (DTV), and friction pad properties by DOE (Design of experiment) analysis. It also provides some insight on the causes, types of brake judder and further gives quantifiable results which determine the bandwidth of the factors based on the experimental results. The paper is structured as follows: the introduction and causes to judder are covered in section 1. Materials and methodology in section 2, Results in section 3, and conclusion in section 4.
- Thompson J, Brake NVH Testing and Measurements, SAE International 2011, Volume R- 399, Page 36 ISBN 978-0-7680-5371-5
- Cho, M. H., Kim, D. S., Yang, S. H., Cho, Y. S., Lee, J. J., & Kim, C. J. A study of the influence of pad properties and disc coning on high speed judder. SAE Technical Paper 2012, 2012-01-1815, page 5,7 https://doi.org/10.4271/2012-01-1815
- Meyer, R., Brake Judder - Analysis of the Excitation and Transmission Mechanism within the Coupled System Brake, Chassis and Steering System, SAE Technical Paper 2005, 2005-01-3916, page 10 https://doi.org/10.4271/2005-01-3916.
- Jardim, F. and Tamagna, A., Study of the Relationship between DTV, BTV and BPV over Judder-Type Vibration of Disc Brake Systems, SAE Technical Paper 2010, 2010-01-1694, page 9 https://doi.org/10.4271/2010-01-1694
- Jacobsson H, Aspects of disc brake judder, Proc. InstnMech. Engrs 2003, Volume 217, Issue 6, Page 420-422 DOI:10.1243/095440703766518069
- Suganuma, Y., Howse, F., and Thornton, C., Dynamometer Simulation Study for Market Brake Judder, SAE Technical Paper 2001, 2001-01-3191, page https://doi.org/10.4271/2001-01-3191
- Dreyer, J., Drabison, J., Liette, J., Singh, R., & Sen, O. T. Effect of disc-pad contact modification on the brake judder source using a simplified elastokinematic model. SAE Technical Papers 2013, 2013- 01-1907, page 1 https://doi.org/10.4271/2013-01-1907
- Fieldhouse, J. D., Bryant, D., & Talbot, C. J., Hot Judder - An Investigation of the Thermo-Elastic and Thermo-Plastic Effects during Braking. SAE International Journal of Passenger Cars - Mechanical Systems 2011, 1086–1101, page 1 https://doi.org/10.4271/2011-01-1575
- Stringham, W., Jank, P., Pfeifer, J., and Wang, A., Brake Roughness - Disc Brake Torque Variation, Rotor Distortion and Vehicle Response, SAE Technical Paper 1993, 930803, page 123 https://doi.org/10.4271/930803.
- Little, E., Kao, T., Ferdani, P., and Hodges, T., A Dynamometer Investigation of Thermal Judder, SAE Technical Paper 1998, 982252, page 8 https://doi.org/10.4271/982252