Low Frequency Vibration Control of Periodic Steel Spring Floating Slab Track Based on Amplitude Amplification Mechanism

doi:10.3901/JME.2024.03.155

Abstract

Abstract: Steel spring floating slab track structures are widely used in urban rail transport due to their excellent vibration damping performance. However, the vibration isolation effect could be better for low frequency vibrations below 20 Hz, especially in the human body-sensitive frequency range (4 to 8 Hz). Given this, a lever-type vibration isolator has been designed to effectively improve the vibration isolation of steel spring floating slab tracks in the human-sensitive frequency range by introducing the idea of amplitude amplification. Based on the periodic characteristics of steel spring floating slab track structures, an analytical model of the band gap characteristics of periodic steel spring floating slab track structures equipped with lever-type vibration isolators is developed using the energy-generalized variational method combined with artificial spring technology. The transmission path characteristics of flexural vibration waves in steel spring floating slab track structures equipped with lever-type vibration isolators are systematically analyzed from the perspective of vibration wave transmission by using the band gap characteristics as an evaluation index. Regulation of low frequency flexural vibration waves in track structures by lever-type vibration isolators is verified. On this basis, the low frequency vibration isolation performance of lever-type vibration isolators under dynamic wheel-rail forces and the effect on the dynamic response of the track structure are analyzed and verified. The results indicate that:the lever-typ vibration isolator has obvious control effect on the low-frequency flexural wave of the floating slab track, which is successfully regulated from 0~9.6 Hz to below 4 Hz. Compared with the ordinary floating slab track, the force transmitted to the lower foundation in the range of 4~8 Hz is greatly attenuated, and the maximum attenuation is about 20 dB. At the same time, the lever vibration isolator also has a certain suppression effect on the vibration of the track structure.

Key words: amplitude amplification, periodic steel spring floating slab track, band gap, flexural wave regulation, low frequency vibration control

CLC Number:

U211
O328

FENG Qingsong, YANG Zhou, GUO Wenjie. Low Frequency Vibration Control of Periodic Steel Spring Floating Slab Track Based on Amplitude Amplification Mechanism[J]. Journal of Mechanical Engineering, 2024, 60(3): 155-169.

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