| 摘要: |
| 提出用模态稀疏结构的频率响应函数(FRF)在共振峰附近的3条谱线来识别其固有频率和阻尼比，并推导了识别公式。以一个简支梁为例对该方法进行了试验考核。在宽频带随机激振条件下，对本文中方法的识别结果与选带分析的测试结果进行比较，结果表明，该方法是一种识别振动模态参数的简便且比较精确的方法。 |
| 关键词: 结构振动 模态参数 识别精度 频率响应函数 选带分析 |
| DOI： |
| 修订日期：2002-03-28 |
| 基金项目: |
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| The Method for Improving Precision of Estimating Modal Parameter |
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| Abstract: |
| For sparse modal structure, a method of estimating natural frequency and damping ratio was developed. In this method, FRF's three spectrum Lines in the neighbour of resonance peaks are used. Estimating formula is deduced out. Taking a simple beam as an example, this method is tested. In wide band excitation, the estimating result is compared with Zoom FFT's result. It is demonstrated that this method is convenient and accurate in estimating vibration modal parameter. |
| Key words: frequency response function,modal parameter,Zoom FFT |
