Identify Inertial Moment Of Power-train And Experimental Testing Research

It is one of the important requisites in the engine mounting system design to accurately determine the inertia moment of a power train. At first the article analyzes the method of inertia moment measurement, and then a new method is presented in this paper, which is based on Trifilar Torsional Pendulum for these parameters, and also analyzes the error of this method. Using this method, an engine assembly is measured; the result shows that this method is effective to measure the inertia moment of engine assembly.In this article we use the method of Trifilar Torsional Pendulum and the suspended method to obtain centroid of the body is in line with the torsional axial of the Trifilar Torsional Pendulum naturally; though matrix transformation process the testing data. The data in the matrix are calculated with the coordinates that are measured with tri-coordinate measurement system. The measured coordinates are with high precisions, so the calculation methods are also with high precisions.Some factors that may produce errors still exist in the proposed identification procedure, but they can be estimated and effectively reduced at every step with least square method. The practicability and reliability of the procedure is illustrated by error analysis, validation of cuboids’ mass block and many tests of real power trains.Finally, through the measurement and result for the inertia properties for engine assembly rotary inertia. It is demonstrated that the test method and data calculate method has good characteristics for repeat measurement and with high precision.