Influence of Car Body-suspended Equipment on the Ride Comfort of High-speed Railway Vehicles

doi:10.3901/JME.2020.22.227

Abstract

Abstract: A parametric vertical dynamic model of a high-speed railway vehicle with a flexible car body and car body-suspended equipment is built to study the influence of suspension parameters of equipment on the ride comfort, in which the equipment mass, geometry and suspension parameters are represented by variable quantities. The frequency response function of car body acceleration is derived through frequency domain analysis method, and the ride comfort index is calculated using random track irregularity spectrum and ride comfort filtering function, and numerical simulation verifies the proposed optimal suspension frequency and damping ratio of the equipment obtained from the optimal homology theory. It shows that the comfort index gets smaller with a higher first bending frequency of car body, a larger mass of the equipment or a closer equipment installation position to the center of the car body. Thus, the equipment which has a mass more than 4 t should be suspended no further than 5 m away from the car body center for good ride comfort. The longitude eccentricity of the equipment changes the force arms of the suspension points, and increases its inertia as well, resulting in a small increment of the ride comfort index. The structural damping of the car body has almost no effect on the optimal suspension parameters. The larger the mass of equipment, the lower the optimal suspension frequency and the larger the optimal suspension ratio. In addition, the optimal suspension parameters relies on the acceleration response rather than the displacement response. The optimal homology requires that the phase difference between the car body and equipment accelerations is close to π/2. For the specific vehicle in this work, the optimal suspension frequency of the equipment is 7 Hz with an optimized ratio of 0.2-0.3, which significantly restrains the power spectrum peak of acceleration on the car body.

Key words: high-speed train, car body-suspended equipment, flexible car body, coupling vibration, suspension parameters, ride comfort

CLC Number:

U270

GUO Jinying, SHI Huailong, WU Pingbo, WANG Jing. Influence of Car Body-suspended Equipment on the Ride Comfort of High-speed Railway Vehicles[J]. Journal of Mechanical Engineering, 2020, 56(22): 227-236.

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