Abstract
In this paper, we present the results of an experimental investigation on squeal noise emitted by a disc brake for railway applications. The measurement, that show in an evident manner the onset of instability forms during the braking phase were made on a test-rig in real scale on which we measured by means of a sound intensity probe the noise emitted by the disc brake. By using a Fast Fourier Transform (FFT) we identified the strongest detected frequencies. The aim of this paper is to analyse such phenomena by conducting a Finite Element Analysis (FEA) of the 3D CAD model of the disk modelled in Ansys Workbench FEM software, in order to, better understand the path that leads a stable system to unstable behaviour. The system analysed is composed of a steel disk and four pads made of an array of cylinders made of frictional material. Such pad system has been designed in order to simplify the simulation, assuming that it acts on the disk surface just in some points. The numerical results agree with the experimental ones.
Highlights
Brakes are one of the most important components in terms of safety and performance in vehicles, and due to increasing requirements related to stability and comfor– tability, have become more complex [1-3]
To verify the results obtained from the finite element analysis, we confronted the numerical results with the sound pressure levels recorded during an experimental investigation conducted on a test-bench during braking, from 70 km=h to zero
We presented a mathematical model to describe the dynamic behaviour of a disk brake system for railways applications
Summary
Brakes are one of the most important components in terms of safety and performance in vehicles, and due to increasing requirements related to stability and comfor– tability, have become more complex [1-3]. The increasing problem of noise generation during braking assumes an economic and technical importance in the transport industry [6,7]. Much progress has been made and many solutions have been suggested, for example by reducing the causes, adding constrained layer (shims) or by moving damping modal coupling elements that constitute the brake assembly [17-21]. Not all of these solutions contribute to the improvement of the vehicle braking qualities [22-24]. Due to these undesirable consequences, friction materials used in automotive braking systems must have wear resistance and high mechanical strength, low thermal conductivity, lubrication components with a role of increasing seizure
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