弯曲共振法共振峰“劈叉”现象研究

发布时间：2018-06-20 08:27

  本文选题：弯曲共振法 + 共振峰　； 参考：《振动与冲击》2017年07期

【摘要】：使用弯曲共振法测量复合试件阻尼参数时,发现频响曲线有时会在共振频率附近产生"劈叉"现象,表现出两个峰值,与一般经验不符。建立了悬臂梁试件受到不同方向激励的耦合振动模型,通过信号合成复原了"劈叉"曲线,表明频响曲线在共振频率附近产生"劈叉"的原因是正交方向弯曲振动模态的干扰;提出了针对"劈叉"曲线的实验数据处理方法;利用阻尼层模量识别过程判断出"劈叉"曲线上两峰对应的振动方向,辨别主共振峰和干扰峰;进而分析了"劈叉"曲线干扰频率与幅度等对试件损耗因子识别精度的影响。结果表明,在主共振峰可辨条件下,使用弯曲共振法常规计算公式,即可得到相当准确的结果,并解决了"劈叉"曲线数据处理的难题。
[Abstract]:When using the bending resonance method to measure the damping parameters of the composite specimen, it is found that the frequency response curve sometimes produces "split" phenomenon near the resonance frequency, showing two peaks, which is not consistent with the general experience. A coupling vibration model excited by different directions of the cantilever beam specimen is established, and the "split" curve is restored through the signal synthesis, and the frequency response curve is shown. The cause of "splitting" near the resonance frequency is the interference of the bending vibration mode of the orthogonal direction. The experimental data processing method for the "split" curve is proposed, and the vibration direction corresponding to the two peaks on the "split" curve is judged by the identification process of the damping layer modulus, and the main resonance peak and the interference peak are identified, and then the interference of the "split" curve is analyzed. The effect of frequency and amplitude on the identification accuracy of the loss factor of the specimen shows that a fairly accurate result can be obtained by using the conventional formula of the bending resonance method under the condition of the main resonance peak, and the problem of the data processing of the "split" curve is solved.
【作者单位】： 西北工业大学航海学院;
【分类号】：TB535.1
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本文编号：2043653