Impact Source Location Research Articles

Determining impact source location in structural networks

An impact, or similar event, generates a transient in a structural network consisting of connected one-dimensional systems. A sensor, attached at an arbitrary point in the network, will ‘‘hear’’ a complicated time series of pulses. A few of these pulses are recorded and used to generate a time-reversed series which is injected at the sensor location. If the network is stationary in time, the impulse response function (IRF) can be used to show that the introduced series will constructively interfere at the original impact point and this location can thereby be determined. The procedure is demonstrated computationally using a time-domain IRF. The relationship between the above and ‘‘reciprocity’’ and ‘‘inverse filtering’’ will be discussed.

Two dimensional source location system for rock fall detection by using cable sensor and mobile multimedia network

Abstract Output characteristics of cable sensor which usually used for invader detection to atomic power station and others were tested. It was found that the cable sensor could be used instead of accelerometer, when high accuracy was not required. Two kinds of experiments for two dimensional source location of impact source of rock fall. It was confirmed that impact source could be evaluated from rise time of wave forms, amplitude array of wave forms and topography pictured by using amplitudes of wave forms. It can be said that two dimensional source location system by using cable sensor and mobile multimedia network is applicable for the rock fall detection.