トウ　リヨウ   Ryo TOH   陶　良    所属   千葉工業大学  工学部 電気電子工学科    千葉工業大学  工学研究科 工学専攻    千葉工業大学  工学研究科 電気電子工学専攻    職種   教授
言語種別	英語
発行・発表の年月	2012/10
形態種別	学術雑誌
査読	査読あり
標題	Relation of Resonant Frequency and Appropriate Linear Predictive Order for Evaluating Concrete Strength by Quality Factor
執筆形態	共著
掲載誌名	Proc. IEEE Ultrasonics Symposium International
出版社・発行元	IEEE
巻・号・頁	pp.715-718
著者・共著者	Ryo Toh, Yahiro Mori, Seiichi Motooka
概要	Concrete is a popular construction material and its strength is the most important performance responsible to the safety structures. We have proposed a new method that evaluates the concrete strength non-destructively using the quality factor of resonant peak of multi-reflected ultrasound propagated inside the concrete. The quality factor is calculated by a linear predictive coefficient (LPC) processing on the ultrasonic signals, where the order of the LPC is an important parameter. In this paper, the relation between the resonant frequency and the appropriate order of LPC is discussed by numerical simulation and experiment. The results show a similar tendency that with a higher resonant frequency, the appropriate order of LPC turns higher and its range turns narrower.