Band gap characteristics and vibration isolation performance of combined periodic cross isolation trenches

doi:10.16265/j.cnki.issn1003-3033.2025.02.1216

Abstract

Abstract:

In order to effectively control low-frequency vibrations in engineering practice, the structure and the formation mechanism of the band gap were analyzed, and the finite element method was employed to investigate the influencing factor of the band gap in combined periodic cross-isolation trenches. Subsequently, this study analyzed vibration isolation performance using the model experiment. The results show that the band gap characteristics of the combined periodic cross-isolation trenches are mainly influenced by the periodic constant, the depth of the channel, the elastic modulus of soil and the filling medium. With the increase of the period constant, combined periodic cross-isolation trenches are more likely to obtain the low-frequency band gaps, but the bandwidth narrows. By increasing the depth, the low-frequency band gap with a larger bandwidth can be obtained, and the number of band gaps increases. With the increase of elastic modulus, the boundary frequency of the band gap migrates to high frequency synchronously, and a more low-frequency and wider band gap can be obtained by filling the medium. The experimental results show that the maximum attenuation amplitude of acceleration in the band gap range reaches 0.001 24 m/s², the average amplitude attenuation ratio in the band gap is 0.206 2, and the maximum attenuation degree reaches 98.4%. The combined periodic cross-isolation trenches have remarkable vibration isolation performance.

Key words: combination period, cross vibration isolation trenches, band gap characteristic, vibration isolation performance, amplitude attenuation ratio, low-frequency band gap

CLC Number:

X966

WANG Haiyang, ZHAI Chunxin, WANG Zhu, FENG Jinhao, ZHANG Xiaomao. Band gap characteristics and vibration isolation performance of combined periodic cross isolation trenches[J]. China Safety Science Journal, 2025, 35(2): 118-126.

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材料	弹性模量/ MPa	密度/ (kg·m^-3)	泊松比
混凝土	30 000	2 500	0.2
钢	210 000	7 850	0.3

频率/Hz	加速度(无减振沟)/ (m·s^-2)	加速度(有减振沟)/ (m·s^-2)
109.88	0.000 73	0.000 33
114.77	0.000 39	0.000 10
117.21	0.001 41	0.000 25
126.98	0.001 31	0.000 07
186.81	0.000 54	0.000 01
192.91	0.000 74	0.000 08