Fundamental study on a high-frequency vibration evaluation in a test stand for magnetically levitated vehicles

Abstract

This paper proposes a method to simulate the primary bending vibration in a test stand consisting of one-third segment car body and a full-scale bogie of magnetically levitated (maglev) vehicles. The purpose of this system is to evaluate an effect of high-frequency vibration to the ride comfort on maglev vehicles. The system utilizes hardware-in-the-loop simulation (HILS), which incorporates hardware components in the numerical simulation. A vehicle dynamics simulation model in the HILS system calculates internal forces acting from remaining two-thirds segment car body which is missing in reality, and applies constraint forces equivalent to the internal forces to the one-third segment using electric actuators. Fundamental studies on the proposed system were conducted. First, a new mathematical model, which can calculate the internal forces in low dimensions for real-time simulation, is presented. The validity of the model is verified with an eigenvalue analysis. Second, results of swept sine excitation experiments demonstrate that the actuators can perform immediate vibration responses with a new control method. Finally, fundamental experiments were conducted with the mathematical model and the control method to evaluate effects on vibration characteristics of one-third segment car body with exciting shearing force and bending moment at the body end. The results of these studies show the technical prospect of the test stand to evaluate the high-frequency vibration of maglev vehicles.

Keywords

• magnetic levitation
• railway
• test stand
• high frequency
• vibration evaluation
• ride comfort
• hardware in the loop simulation