Sound source location method with three-dimensional multi-point measurement and particle velocity-vector linear convergence approach for infrasound generated by rock failure in soil

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (14) : 144-152.

ZHAO Jiubin1,2，LIU Yuanxue1,2，BAI Zhun1,2，YANG Juntang1,2，HE Shaoqi1,2

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Abstract

On the eve of geological hazards such as landslide and debris flow, rock and soil mass in the hazard body will be damaged by explosion, friction and fracture, which will produce and spread out low-frequency infrasound signals.In an infrasound sound field, sound pressure is a scalar field and particle velocity is a vector field.The velocity vector field can be used to accurately predict the three-dimensional coordinate position of the disaster location in advance.In the paper, numerical simulations were used to calculate the explosion of small equivalent explosive in soil.It is found the main energy frequency of the infrasound wave evolved from the attenuated explosive shock wave is between 2 and 8 Hz by signal spectrum analysis.The phenomenon of infrasound signal in the same frequency range generated by rock failure in excavated soil was simulated.Based on this, a method of locating infrasound source with three-dimensional multi-point hetero-plane linear aggregation was proposed.The particle velocity vector signal was collected by N sensor arrays in the wave field.It is proved that the N straight lines which pass through the measured point and whose normal is in the velocity vector direction will direct and converg to the place where the sound source occurs.Then, calculating the distance between two straight lines, a shortest distance line segment equation was built to obtain N-1 midpoint coordinates.The centroid coordinates of each midpoint coordinates are just the source location which can be used to predict the occurrence of geological hazards.As an example, the sound source location procedure was practiced by simulating infrasound signals from some solid soil landslide models and different media models, and arranging three measuring points were arranged at different positions in the model to collect infrasound signals, and the method is proved to be able to locate the 3D sound source location inside the disaster body accurately.The method provides a new idea for improving the early warning technology of landslide and debris flow.

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infrasound / sound source location / particle velocity / linear aggregation

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ZHAO Jiubin，LIU Yuanxue，BAI Zhun，YANG Juntang，HE Shaoqi. Sound source location method with three-dimensional multi-point measurement and particle velocity-vector linear convergence approach for infrasound generated by rock failure in soil[J]. Journal of Vibration and Shock, 2021, 40(14): 144-152

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