A study on optimization of the structure-borne noise from a trough girder based on response surface methodology

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (20) : 56-60.

LIU Linya1, QIN Jialiang1, LEI Xiaoyan1,LIU Quan1, SONG Rui1,2

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Abstract

The low frequency noise radiated by a trough girder under the dynamic load of trains is very harmful to human health.Taking a 30-m simply-supported trough girder for rail transit as the research object, based on the vehicle-bridge coupling analysis model, the sound power of rail transit trough girder was calculated by using the finite element method and the boundary element method.Then the response surface methodology and the calculation of sound power were combined, acoustic optimization model was established which takes total sound power in the range of analyzing frequency of the trough girder as the target and the quality of the trough girder as the constraint.Finally, the sequential quadratic programming was used to obtain the optimum section size of the trough girder.The thickness of the deck is 0.34m and the thickness of the web is 0.22m after acoustic optimization of trough girder.The results show that the response surface methodology can effectively optimize the structure-borne noise from a trough girder, and the effect of noise reduction is still significant after the optimization.

Key words

trough girder / finite element method / boundary element method / structure-borne noise / response surface methodology / acoustic optimization

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LIU Linya1, QIN Jialiang1, LEI Xiaoyan1, LIU Quan1, SONG Rui1,2. A study on optimization of the structure-borne noise from a trough girder based on response surface methodology[J]. Journal of Vibration and Shock, 2018, 37(20): 56-60

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