Tribological and dynamical analysis of a brake pad with multiple blocks for a high-speed train

Abstract

In this research, the tribological and dynamical characteristics of a brake pad with multiple blocks are investigated using experimental and numerical methods. A dynamometer with a multiblock brake pad configuration on a brake disc is developed and a series of drag-type tests are conducted to study the brake squeal and wear behavior of a high-speed train brake system. Finite element analysis is performed to derive physical explanations for the observed experimental phenomena. The experimental and numerical results show that the rotational speed and braking force have important influences on the brake squeal; the trends of the multiblock and single-block systems are different. In the multiblock brake pad, the different blocks exhibit significantly different magnitudes of contact stresses and vibration accelerations. The blocks located in the inner and outer rings have higher vibration acceleration amplitudes and stronger vibration energies than the blocks located in the middle ring.

An analytical thermal model of a railway vehicle brake shoe

“…and J W n is the Bessel function of the first kind with order W n and J 0 W n is the derivative of the Bessel function. By applying the initial condition (22), the constant c n P can be achieved as…”

“…Kim 21 has done vibration analysis of tread brake block in the brake dynamometer for the high-speed train. Wu et al 22 has studied tribological and dynamic analysis of a brake pad with multiple blocks for a high-speed train. Sawley et al 4 has calculated the temperature of sliding wheel and rail for modification of wheel resistance in braking mode.…”

“…Wu et al. 22 has studied tribological and dynamic analysis of a brake pad with multiple blocks for a high-speed train. Sawley et al.…”

Friction material wear: Effects and interactions between service brake temperature, lining contact pressure, and vehicle speed

“…5,6 Brake disc temperatures are also studied to avoid excessive pad wear during braking service. [7][8][9][10] Pin-on-disc test (also called ball-on-disc) has been frequently used to evaluate friction material wear [11][12][13][14][15] . Chandra et al 12 carried out wear tests at 3.14 m/s speed for 50 min using two contact pressures: 0.5 and 2.0 MPa, and the volume loss respectively seen was 1.75 mm 3 and 4.00 mm 3 .…”