| 四元数联合传递率在结构状态检测中的应用 |
| Application of Quaternion-based Three-channel Joint Transmissibility in Structural State Detection |
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| 中文摘要: |
| 结构两点之间的传递率定义为测得响应信号的频谱之比，它与激励输入无关，综合反映了结构的物理特性，包括刚度、阻尼和质量等，因此被广泛应用于结构状态检测。本文将基于单通道振动信号的传递率推广至三通道振动信号的四元数联合传递率，将三轴加速度计采集的振动信号构建为矢量信号进行三通道联合处理。该方法保持了不同通道信号之间的关联性，克服了传统方法中单通道处理再联合分析的信号失真问题，同时也避免了不同次测量中传感器安装姿态对检测结果的影响，提高了实际工程应用性。基于无砟轨道综合试验平台，结合卡洛变换(K-LT)和对偶树四元数小波变换(DQWT)进行了扣件松脱以及温度力变化的状态检测，均获得正确率95%以上的检测结果。 |
| 英文摘要: |
| The transmissibility of the structure can be defined as the ratio of spectrum of two measured response signals. The transmissibility is entirely unrelated to the excitation, which comprehensively reflects the physical characteristics of the structure, such as stiffness, damping and mass. Therefore, it is widely used in structural state detection. Here, signals observed by tri-axial accelerometer are treated as vector signals, and then transmissibilities for single channel signal are extended to quaternion-based three-channel joint transmissibility (QTJT). This method preserves the correlation among different channels, and overcomes the problem of signal distortion caused by separate processing for each single channel. Moreover, QTJT avoids the negative influence of sensor installation attitude on the final results in different detections. Thus the engineering practicability is improved. Based on the comprehensive test platform of ballastless track, state detection experiments of fastener loosening and temperature force changing were carried out by using QTJT, in which method of Karhunen-Loeve Transform (K-LT) and dual-tree quaternion wavelet transform (DQWT) were employed, respectively. For each experiment, detection result with the accuracy of over 90% was obtained. |
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| 中文关键词: 结构状态检测 四元数联合传递率 扣件松脱 温度力 |
| 英文关键词:structural state detection quaternion-based three-channel joint transmissibility fastener loosening temperature force |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2021.05.07 |
| 引用本文：任同群1,2, 郑培珍2, 徐征1,2, 王晓东1,2.四元数联合传递率在结构状态检测中的应用[J].计测技术,2021,(5):. |
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