Fundamental study on bending vibration reduction with a test stand for magnetically levitated vehicles

Abstract

Fundamental study on a method to reduce the primary bending vibration for magnetically levitated (maglev) vehicles is conducted. These vehicles composed of lightweight car bodies are subject to elastic vibration; therefore, reduction of bending vibration will have considerable effect on ride comfort. First, a vehicle dynamics simulation model that can simulate bending car body is constructed to compare and analyze with the resonance characteristics of actual car body vibration in the field test. Then, this paper presents the optimal specification of the anchor, a coupling element between the car body and the bogie, to reduce the primary bending vibration. The validity of the calculation method of the specifications is verified by frequency response analysis, eigenvalue analysis, and vehicle dynamics simulation. Next, a test stand consisting of one-third segment car body to simulate the primary bending vibration is developed utilizing hardware-in-the-loop simulation (HILS). The results of swept sine excitation experiments confirm that the one-third car body can simulate the primary bending vibration of a full-scale car body with the HILS system. Finally, fundamental experiments are conducted in the test stand to reduce the primary bending vibration. The experimental results show that the optimally-designed anchor can reduce the primary bending vibration.