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3-D computer research and comparative analysis of dynamic aspects of drum brakes and caliper disc brakes

Slavchev Y., Dimitrov L., Dimitrov Y.

Archive of Mechanical Engineering

2018

Vol. LXV, nr 2

253--276

This paper presents the construction of adequate 3-D computer models for simulation research and analysis of dynamic aspects of caliper disc brakes, as well as of drum brakes, actuated by a short stroke electromagnet or a hydraulic thruster, when these brake types are used in the hoisting mechanism of cranes. The adequacy of the 3-D models has been conﬁrmed by comparing their simulation results with results from an experiment and from classic computation a models. The classic computational models, related to the study of main dynamic features of friction brakes, are layouts that are based on a number of assumptions, such as that the braking force instantly reaches its steady-state value, the clearance between the friction lining and the disc/drum is neglected, etc. These assumptions lead to alimitation of research options. The proposed 3-D computer models improve the research layouts by eliminating a number of the classic model assumptions. The improvements are related to the determination of the braking time, braking torque, normal force and other dynamic aspects of the brakes by performing simulations that take into account: the braking force as a function of time, the presence of clearance between the friction lining and the disc/drum, etc.

Badanie wybranych parametrów procesu hamowania hamulca tarczowego

Sawczuk W.

Czasopismo Techniczne. Mechanika

2012

R. 109, z. 3-M

125--137

W niniejszym artykule zaprezentowano metodykę badań oraz wyniki uzyskane na bezwładnościowym stanowisku po przeprowadzeniu badań ciernych na kolejowym hamulcu tarczowym. Na podstawie serii badań o charakterze trybologicznym przebadano pary cierne hamulca tarczowego i wyznaczono charakterystyki procesu hamowania w zależności od prędkości hamowania, docisku okładzin do tarczy hamulcowej oraz mas hamujących. N a podstawie wyników z ciernych badań stanowiskowych wyznaczono zależności współczynnika tarcia (chwilowego i średniego), temperatury oraz drogi hamowania, w funkcji zużycia okładzin i prędkości początku hamowania.

This paper presents a method of research and results obtained at inertial station after carrying out friction tests of railway disc brake. O n the basis of series of tests of tribological character, friction sets of disc brake were tested and characteristics of the process of braking depending on braking velocity, disc’s clam to the brake disc and braking masses were defined. O n the basis of results from friction stationary research, dependencies of coefficient of friction (instantaneous and average), temperature of disc brake and braking distance in the function of the wear of pads and speed at the beginning of braking were determined.