Stability Optimization of a Disc Brake System with Hybrid Uncertainties for Squeal Reduction

Table 3

The probability distributions of probabilistic variables.

Probabilistic variable	Unit	Distribution type	Distribution parameters
			Expectation	Standard deviation
Density of friction material	kg/dm^3	Normal	2.51	0.04
Elastic modulus of friction material	GPa	Normal	5.94	0.09
Density of disc	kg/dm^3	Normal	7.2	0.10
Elastic modulus of disc	GPa	Normal	125	2.0
Brake pressure	MPa	Normal	0.5	0.008