Page 16 - 《应用声学》2020年第3期

第 39 卷 第 3 期 Vol. 39, No. 3
2020 年 5 月 Journal of Applied Acoustics May, 2020

⋄ 研究报告 ⋄

基于近场辐射声压信号的索力识别方法 ∗

余忠儒 1 邵 帅 1,2 周志祥 2† 邓国军 1 王邵锐 1 简传熠 1

(1 重庆交通大学土木工程学院 重庆 400074)
(2 深圳大学土木交通工程学院 深圳 518061)
摘要：为准确、快速获取拉索结构索力，该文提出利用结构近场固定位置辐射声压信号对拉索进行索力测试
的方法。基于动力学理论推导出结构振动加速度响应与其近场辐射声压响应的线性比例关系，并根据希尔伯
特 -黄变换推导了声压响应信号与结构频率的关系。对单根拉索依次施加 3 种不同工况的初始张拉力，并对结
构中心表面处施加一瞬时脉冲力，使拉索受迫振动发声，通过对结构近场范围内拉索振动辐射声压进行测量，
进而获得不同工况下不同位置声压响应信号，并探讨了在有高斯噪声干扰情况下通过希尔伯特 -黄变换方法
获取拉索固有频率的可靠性。数值模拟分析验证了该方法能较为准确地得到拉索固有频率并利用索力计算实
用公式有效地计算出索力值，为实际工程中拉索索力测试提供了一种新的简单有效的方法。
关键词：索力测试；近场声压；Hilbert-Huang 变换；固有频率
中图法分类号: U441+.3 文献标识码: A 文章编号: 1000-310X(2020)03-0336-08
DOI: 10.11684/j.issn.1000-310X.2020.03.003

Cable force identification method based on near-field radiated

sound pressure signal
YU Zhongru 1 SHAO Shuai 1,2 ZHOU Zhixiang 2 DENG Guojun 1

WANG Shaorui 1 JAN Chuanyi 1

(1 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China)
(2 College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518061, China)

Abstract: In order to accurately and quickly obtain the cable force of the cable structure, a method for testing
the cable force was proposed in this paper by using a sound pressure signal radiated from a fixed position in
the near-field of the structure. Based on the dynamic theory, the linear proportional relationship between the
vibration acceleration response of the structure and its near-field radiation sound pressure response was derived,
and the relationship between the sound pressure response signal and the structure frequency was derived based
on the Hilbert-Huang transform (HHT). The initial tension of three different working conditions was applied to
a single cable in turn, and an instantaneous load was applied to the center surface of the structure, so that the
cable was forced to vibrate and sound. The measurement was performed to obtain the sound pressure response
signals at different positions under different working conditions, and the reliability of obtaining the natural
frequency of the cable through the HHT method in the presence of Gaussian noise was discussed. Numerical
simulation analysis verifies that the method can accurately obtain the natural frequency of the cable and
effectively calculate the cable force value using the practical formula of cable force calculation, which provides
a new simple and effective method for the cable force test in actual engineering.
Keywords: Cable force test; Near-field sound pressure; Hilbert-Huang transform; Natural frequency

2019-11-28 收稿; 2020-02-24 定稿
国家自然科学基金项目 (51778094), 研究生教育创新基金项目 (2019S0141), 国家自然科学基金青年科学基金项目 (51608080), 重庆市
∗
教委、科学技术研究项目 (KJ1600507)
作者简介: 余忠儒 (1995– ), 男, 四川武胜人, 硕士研究生, 研究方向: 桥梁健康监测与加固。
† 通信作者 E-mail: zhixiangzhou@szu.edu.cn