Square Of Frequency Change In Applied Research, In The Pressure Pipe Damage Identification Method And Wavelet Transform

At present, the damage identification method based on structure vibration was used for trouble diagnosis in aerospace field and mechanical engineering originally, which was focused by civil engineering and introduced to damage identification of civil engineering as a supplement of traditional methods. And so the detection, location and estimation problem of structural damage has been the subject of much current research in recent years. This paper based on the theory of fundament and actuality and attempted the vibration method which of used to damage detection of the stress pipe.Pipe transportation is one of five top transportation mode, but because of it's particularity of applications, and not seldom exists many a snake in the grass of safety. So in order to hold in the damage of pipe, and required to detect it imminently. Firstly, this paper in brief summarized the updated development of civil and international document through consulted correlative document; secondly put forth a new method----the method of frequency change square ratio; in the next place introduced briefly the theory of wavelet; lastly detected the damage to a pipe used the method of frequency change square ratio and the theory of wavelet, and the result showed the effectiveness of these method in the engineering.