FREQUENCY RESPONSE CHARACTERISTICS OF BENDER ELEMENT TEST SYSTEM IDENTIFIED BY FREQUENCY-SWEPT SIGNAL INPUT —INFLUENCE ON ACCURACY OF RECEIVED WAVEFORM RECONSTRUCTION—
FREQUENCY RESPONSE CHARACTERISTICS OF BENDER ELEMENT TEST SYSTEM IDENTIFIED BY FREQUENCY-SWEPT SIGNAL INPUT —INFLUENCE ON ACCURACY OF RECEIVED WAVEFORM RECONSTRUCTION—
复制标题
通过扫频信号输入识别 BENDER Element 测试系统的频率响应特性 —对接收波形重构精度的影响 —
DOI：
10.3208/sandf.50.737
复制
发表时间：
2010
影响因子：
3.7
通讯作者：
M. Tsushima
中科院分区：
文献类型：
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作者：
Toshihiro Ogino;T. Mitachi;H. Oikawa;Takayuki Takahashi;M. Tsushima
本文在作者提出的弯曲元件试验接收波形重构方法的基础上，从重构精度的角度讨论了该方法所要求的试验系统频响特性和扫频信号特性。为了探讨影响频率响应特性的因素，利用11种扫频信号对几种弯曲元件测试系统的频率响应进行了实验辨识。测试结果表明，系统的频率响应在很大程度上取决于样本的种类，而频率响应的辨识则受输入扫频信号特性的影响。然后计算重建的接收波形并与观察到的波形进行比较。提出了一种归一化互相关函数来定量估计两个波形之间的相似程度，并将其应用于重建波形和观测波形。这种比较分析表明，在给定的频率范围内的频率响应的准确识别导致准确的波形重建。此外，测试结果表明，这种重建技术在嘈杂的环境中的一个额外的优势。
On the basis of the method for received waveform reconstruction that the authors had previously proposed on bender element test, this paper discusses the required characteristics of frequency response of the test system and frequency-swept signal, which are essential for the method, from the view point of reconstruction accuracy. In order to argue influence on characteristics of frequency response, frequency responses of several bender element test systems are experimentally identified by using eleven kinds of frequency-swept signals. Test results show that the frequency response of the system is substantially determined by the kinds of sample and identification of frequency response is affected by characteristics of input frequency-swept signal. Then reconstructed received waveform is calculated and compared to observed waveform. A normalized cross-correlation function is proposed to estimate quantitatively the degree of similarity between two waveforms and applied to the reconstructed and observed waveforms. This comparative analysis reveals that accurate identification of frequency response in a given frequency range leads to accurate waveform reconstruction. Also, test results show an additional advantage of this reconstruction technique in a noisy environment.