Development Of A Test Rig For Measuring The Inertial Parameters Of Passenger Vehicle Powertrain

The moment of inertia is to describe the rigid body moment of inertia of the size of thephysical quantity is an important physical quantities of the rigid body rotation law, it dependsnot only on the total mass of the rigid body, but also to the rigid body’s shape, massdistribution and the shaft position. In engineering practice, for the mass distribution isuniform, with a regular geometric shape of the rigid body moment of inertia around a fixedaxis rotation can be calculated by mathematical methods. The uneven distribution of mass,there is no regular geometric shape of the rigid body, using mathematical methods to calculatethe moment of inertia is quite difficult, and usually use experimental methods to determine themoment of inertia. Thus, the experimental method of determination of the rigid body momentof inertia has important practical significance.Moment of inertia measurements are generally rigid body to a certain form of movement,to describe the movement of specific physical relationship between the moment of inertia toindirectly measure the rigid body moment of inertia. Determination of moment of inertia,more experimental methods, such as the stretching method, three-wire pendulum, compoundpendulum method.Taken to measure the moment of inertia of a rigid body, there are errors. In order tomake different measurements comparable in recent years, international uncertainty to evaluatethe accuracy and reliability of the results. Although there have been some reportedexperimental error analysis, uncertainty analysis and almost none in engineering design,engineering and technical personnel with uncertainty analysis is not very familiar with.Therefore, three-wire pendulum measurements of the moment of inertia of the powertrain, theuncertainty on the measurement results carried out a detailed analysis of the engineering andtechnical personnel to better grasp and understand the uncertainty with certain guidingsignificance.Based on three-wire torsion pendulum test the inertial parameters of the method. Themethod uses a suspension way to ensure that the measured rigid body center of mass falls onthe axis of the torsion pendulum swing in three-wire; data processing method based oncoordinate transformation and coordinate transformation data calculated by the measurementof the coordinates of the point. Coordinates measured by the coordinate measuring system,high precision, and thus the accuracy of the data processing; test data measured for each rigidbody suspended attitude, both for solving the center of mass can also be used to solve the inertia parameters, the experimental test simple and efficient. In this paper a comprehensiveanalysis of all aspects of the error in the inertial parameter testing and strict control: control ofthe key components of the processing error accuracy can be improved; parameter calibrationmethod can obtain accurate three-wire pendulum system parameters; according to theprinciple of least squares to reduce the numerical calculation error. Tested the combination ofa rectangular inertial parameters, and compared with theoretical value, indicating that theexperimental method with test is simple and efficient, and effective method of data processing,and high accuracy test. Finally, a powertrain inertia parameters of the test and analysis results,show that the bench In this paper test methods and data processing methods and dataprocessing systems, with better test repeatability and test accuracy. The experiments describedin the text and data processing methods can also be used for other types of irregular objectsinertia parameters of the test.