Compensation of inertia error in brake dynamometer testing

Loss in terms of windage and bearing friction is an important origin of inertia error to be compensated in brake dynamometer testing, acquisition of which has always been a troublesome problem. An indirect method of loss measurement using speed data under null pipeline pressure is described in this paper. Mathematical model of resistance torque or energy loss is calculated by regression of collected speed data using SPSS software. Error compensation of two inertia simulating methods, torque control method and energy compensation method, is discussed. Experiments of the former are conducted on NT11 brake dynamometer, which proves it to be effective in eliminating inertia error.