Acoustic / Vibration Of Life Detection System Mathematical Model

The Earthquake Emergency Response Rescue Technology always is a vital problem in worldwide research. In this paper, the author undertook and completed the study on mathematical and physical model of the life detection system based on sound wave and vibration theory. It is a branch of National Fifteen Tackling Key Problem-Life Detection And Orientation Of Earthquake Emergency Response System.The study begins with the analysis of the basic theory about sound wave and vibration signals, and analyses several possible signals and their Characteristic in earthquake site through a series of experiments. Referring to the classical location method attributed to Geiger, this paper brings up a scheme according to energy tracking and time difference of arrival(TDOA) theory to the position location of the survivor. And proves the feasibility of this scheme through a series of experiments.Because of the complexities of the earthquake site, it is especially important to study the improvement of the Signal-to-Noise Ratio. This is an important point in this paper. For the good property of separation between signal and noise, Wavelet analysis is introduced to the denoising of sound wave and vibration signals in this paper. The emphasis is placed on the contrasts filtering methods of several wavelets with that of tradition technique. Thereout, conclusion obviously is that wavelet is better in filtering.Beside filtering interference signals and extract effective signals, it is a difficult problem to study the separation of multi-signal of sound wave and vibration. In this paper, the author introduces the Blind Source Separation(BSS) method-Independent Component Analysis(IC A) to the separation of multi-signal of sound wave and vibration, and get ideal result in separation of theoretical and experimental data.