| 基于声表面波谐振器的扭矩检测研究 |
| Research on torque measurement based on surface acoustic wave resonators |
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| 中文摘要: |
| 针对当前声表面波扭矩检测技术在理论分析、算法设计、实验测试方面的现状和存在的问题，研究基于声表面波（Surface Acoustic Wave， SAW）谐振器的扭矩检测技术。根据扭矩在转轴和谐振器之间以应变形式传递的特点，建立拉格朗日坐标系下的应变偏载理论模型。定义频率扭矩系数作为切型优化的指标，基于频分多址原理设计制作4个声表面波谐振器。根据声表面波谐振器的回波特性，总结谐振频率的测量方法及特点。分别搭建静态、动态扭矩无线检测系统，静态检测系统采用扫频测强度方法，通过“大步长粗扫”结合“小步长细扫”的扫频方案增强实时性，并提高频率测量精度；动态检测系统采用载波频率测量方法，通过“频域三次样条插值”解决频谱分辨力不足、扭矩测量精度过低的问题。实验结果显示：当无线检测距离大于20 cm、扭矩测量范围为-80 ~ 80 N·m时，静态检测系统最大测量误差不超过1 N·m；当无线检测距离大于20 cm、扭矩测量范围为0 ~ 80 N·m、转速不高于600 r / min时，动态检测系统最大测量误差不超过3 N·m，验证了基于声表面波谐振器的扭矩检测系统的有效性，为高精度扭矩检测提供了新思路。 |
| 英文摘要: |
| In view of the current status and existing problems of the surface acoustic wave (SAW) torque measurement technology in theoretical analysis, algorithm design and experimental test, the torque measurement technology based on the SAW resonator (SAWR) is studied. According to the feature that the torque on the shaft is transmitted to the SAWR by the strain, the theory model of the strain loading in the Lagrange coordinates is established. The torque coefficient of frequency is defined as an important indicator for cuts optimization, and four SAWRs are designed and produced according to the principle of frequency division multiple access (FDMA). On the basis of the echo characteristics of the SAWR, the measurement methods of the SAWR resonance frequency and their characteristics are summarized. The wireless measurement system for static and dynamic torque are built respectively. The static system utilizes the method of frequency sweep for the signal strength measurement, which combines big step for rough sweep with small step for fine sweep for the purpose of enhancing real?time performance and improving the frequency measurement accuracy. The dynamic system employs the carrier frequency measurement method, and solves the problems of insufficient spectrum resolution and low torque measurement accuracy by the cubic spline interpolation in the frequency domain. The results show that the maximum measurement error of the static system does not exceed 1 N·m when the wireless distance exceeds 20 cm and the torque range is from -80 to 80 N·m; The maximum measurement error of the dynamic system does not exceed 3 N·m when the wireless distance exceeds 20 cm, the torque range is between 0 and 80 N·m, and the rotational speed does not surpass 600 r / min. The results validate the effectiveness of the torque measurement system based on the SAWRs, which provided a new approach for high?precision torque measurement. |
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| 中文关键词: 声表面波谐振器 扭矩检测 频率扭矩系数 谐振频率 功率检波 三次样条插值 |
| 英文关键词:surface acoustic wave resonator torque measurement torque coefficient of frequency resonance frequency power detection cubic spline interpolation |
| 基金项目: |
| DOI：10.11823/j.issn.1674-5795.2024.05.07 |
| 引用本文：黄明镜, 陈智军, 孙聪, 钟明, 宿丕强.基于声表面波谐振器的扭矩检测研究[J].计测技术,2024,44(5):. |
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