不同声子晶体模型的轨道结构振动带隙对比分析

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Abstract In order to analyze the vibration characteristics of track structure accurately from the perspective of elastic wave, the transfer matrix method was used to establish 4 kinds of phononic crystal theoretical analysis models, single-layer Euler beam, single-layer Timoshenko beam, double-layer Euler beam and double-layer Timoshenko beam. The energy bands and transmission characteristics of track vibration was studied in 0-3500 Hz. The results showed that without considering the influence of damping there is no obvious difference between the single-layer Euler beam model and the single-layer Timoshenko beam model in 0-250 Hz，while the band gap position is significantly different above 1000 Hz. The band gap position in the low frequency during 0-250 Hz was different between the double-layer Euler beam model and the double-layer Timoshenko beam model, when the frequency increases to more than 250 Hz, the double-layer beam model is basically the same, but significantly different from that of the single-layer beam model. When considering the damping affection, the passband changed into incomplete band gap, the width of the forbidden band appeared a small broadening, and the center position of the forbidden band is negligible affected by the damping. Site tests results show that at low frequencies (0-250 Hz) The band gap is basically consistent with the theoretical analysis results. Therefore, in order to study the track vibration and noise controlling with the phononic crystal theory, the Timoshenko beam model was more accurate to analyze the medium and high frequency vibration of more than 250 Hz, the single-layer support Euler beam model and single-layer support Timoshenko beam model can be chosen in ballastless track, while when the analysis frequency range was below 250 Hz, the double-layer support Timoshenko beam model should be chosen.

Key words： elastic wave propagation band gap phononic models ballast track ballastless track

Received: 12 October 2020 Published: 15 March 2022

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	Articles by authors
	LIANG Yuxiong1
	FENG Qingsong1
	LU Jianfei2
	YANG Zhou1
	LEI Xiaoyan1

Cite this article:

LIANG Yuxiong1,FENG Qingsong1,LU Jianfei2, et al. Comparative analysis of vibration band gap of track structure with different phononic crystal models[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(5): 131-140.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I5/131

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