Error analysis of inertia parameters measurement for irregular-shaped rigid bodies using suspended trifilar pendulum

An error analysis method for the measured inertia parameters of an irregular-shaped rigid body using suspended Trifilar Torsional Pendulum (TTP) is presented. Model errors, parameters measurement errors and coordinate systems measured errors are three kinds of errors in inertia parameters measurement of a body, and the influence of these factors on measured inertia parameters are analyzed in this paper. The main factor influencing the measured error of center of gravity of the body is the measured pendulum axis. Initial angular displacement of TTP has great influence on the measured accuracy of the inertia tensor (moment of inertia and product of inertia). A method for reducing measurement errors of an assembly body is proposed. The inertia parameters of a powertrain consisting of an engine and a transmission are measured to validate the proposed procedures.

Automated summary

This paper presents an error analysis method for measuring the inertia parameters of irregular-shaped rigid bodies using a suspended Trifilar Torsional Pendulum (TTP). The influence of model errors, parameters measurement errors, and coordinate systems measured errors on the measured inertia parameters is discussed, and a method for reducing measurement errors is proposed. The accuracy of the measured inertia tensor is greatly influenced by the initial angular displacement of the TTP, and a validation on powertrain inertia parameters is conducted to confirm the effectiveness of the proposed procedures.