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兵工学报 ›› 2022, Vol. 43 ›› Issue (10): 2679-2686.doi: 10.12382/bgxb.2021.0508

• 论文 • 上一篇    

振动测试中低频失真放大问题的机理

杨蔚原, 胡俊奇   

  1. (北京机电工程研究所, 北京 100074)
  • 上线日期:2022-06-07
  • 作者简介:杨蔚原(1973—), 男, 高级工程师, 硕士。 E-mail: ywyemail@sina.com

Mechanism of Amplifying Distortion at Low Frequencies in Vibration Meadurement

YANG Weiyuan, HU Junqi   

  1. (Beijing Mechanics & Electronics Engineering Institute, Beijing 100074, China)
  • Online:2022-06-07

摘要: 针对振动环境试验和振动测量中低频失真放大现象的机理问题,应用MATLAB软件进行分析和仿真,在典型随机信号上叠加低频正弦信号或脉冲信号,复现了低频失真放大现象。通过试验对低频失真的物理机理进行了研究。分析和试验结果表明,测量信号中超低频成分与特定的谱分析方法共同作用,是出现低频失真放大的直接原因。测量电路虚接、电路连接松脱、测量超出传感器量程、被测结构或传感器松动、特殊结构单向脉冲等情况,是产生超低频信号并间接导致低频失真的物理原因。仿真与试验结果一致,证实了振动测试低频失真放大的机理。对该机理的认识有助于减少相关振动测量问题。

关键词: 振动测试, 低频, 失真放大, 功率谱

Abstract: The reason for the amplifying distortion of vibration power spectrum at low frequencies is analyzed. It is validated through Matlab simulation that the combination of low-frequency signals and a specific analysis method are the cause. The physical reason for low frequencies is analyzed, and it is proved through tests that the bad contacts of the circuit, overranged sensors, poor connection of detected structures or sensors, and unidirectional pulse of special structures may cause distortion. The simulation results fit well with the experimental ones.

Key words: vibrationmeasurement, lowfrequency, amplifyingdistortion, powerspectrum

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