Advanced Engineering Research (Mar 2020)
Brake rigging dynamic simulation under braking on a track section with irregularities (the case of a passenger car)
Abstract
Introduction. The paper considers simulation of the dynamic processes of the brake rigging of a passenger car under braking on a track section with irregularities. The work objectives include the development of a “rigging brakeblock -wheel working surface” contact module in a full-scale computer model of a passenger car in the “Universal Mechanism” software package; and a computer simulation of the braking operating mode from 50 to 32 km/h considering vertical and horizontal track rail irregularities for determining the mechanism of variation of the longitudinal acceleration of the brakeblock and its angular acceleration. The subject of the study is the force interaction of the elements and dynamic processes in the brake system of passenger cars.Materials and Methods. A new “rigging brakeblock - wheel working surface” contact module, which provides the de-termination of the longitudinal and angular accelerations of the brake rigging of a passenger car, is proposed to the “Universal Mechanism” software package,. The simulated modeling of the brake rigging system of a passenger car with KVZ-TsNII type II trolleys equipped with shoe brakes is carried out.Results. A full-scale computer model of a passenger car, which includes the designed contact module “linkage brake pad - wheel working surface”, has been developed in the “Universal Mechanism” software package. The car is present-ed as a system of solids connected by elastic and dissipative elements. Using computer simulation, the operating mode of braking was reproduced under reducing the speed of a passenger car from 50 to 32 km/h considering vertical and horizontal irregularities of a railway track. The simulation result was the laws of change in the longitudinal acceleration of the brakeblock and its angular acceleration under braking in the above speed range. Their spectra of longitudinal an-gular acceleration of the brakeblock were constructed. It was determined that the presence of track irregularities affects the spectral composition of the accelerations. In addition, under the superposition of the bogie-frame pitching and bouncing oscillations, when moving along an uneven track, the rigging block can move up and down the wheel-working surface within a range of up to 50 mm. The simulation functionality of the dynamic processes of the brake system of a passenger car was expanded in the “UM-Loko” software package.Discussion and Conclusions. The results obtained can be used in the design of new rigging brake systems of passenger cars and modernization of existing ones at the engineering enterprises and railway-car repair works. This, in turn, should ensure uniform distribution of efforts across all brake rigging brakeblocks of a passenger car.
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