The characteristics of two truck rear-axle hydraulic brakes with different linings are determined from mobile dynamometer tests and are modeled by a regression analysis relating the brake effectiveness to actuation force, sliding velocity, and drum/lining interface temperature. A finite element heat transfer model is used to determine the interface temperature. A multinomial expression involving 27 regression coefficients for one brake and 36 regression coefficients for the other brake is found sufficient to characterize these brakes with high coefficients of determination. The regression model for one brake, developed from test data acquired on the constant-speed mobile dynamometer, is used to predict the earlier performance of that same brake on an inertia dynamometer. Though the agreement obtained generally demonstrates the capability of the model at predicting instop torque performance, errors due to effectiveness changes caused by work history are evident. Practical applications of the brake model for predicting FMVSS 105 stopping distance performance and other uses are discussed. (DePo)
Modeling the in-stop torque performance of hydraulically-actuated truck brakes
Simulation des Bremsmomentes einer hydraulisch betaetigten Lastkraftwagenbremse
US Government Research Reports ; Dec ; 1-51
1978
51 Seiten
Report
Englisch