Research on measuring method of centre of gravity and moment of inertia for car body of high-speed EMUs

Abstract

The dynamic performance of a high-speed train is heavily influenced by its centre of gravity and moment of inertia. Therefore, accurately measuring these parameters is crucial. This paper proposes an integrated test method for measuring the centre of gravity and moment of inertia based on the excitation method by analyzing the structural characteristics of the vibration test bench. The proposed method is efficient as it only requires installing the car body once, unlike the past method of combining excitation and suspension. This paper provides a comprehensive theoretical derivation of the method used to test the center of gravity and moment of inertia of a specific type of high-speed electrical motor units (EMU) car body. The results of the test were compared to the theoretical values, and the error was found to be minimal, meeting the necessary engineering application requirements.