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林业科学 ›› 2005, Vol. 41 ›› Issue (6): 132-137.doi: 10.11707/j.1001-7488.20050622

• 论文及研究报告 • 上一篇    下一篇

国产人造板宽带砂光机功率谱密度和试验模态分析

王正 朱典想   

  1. 南京林业大学,南京210037
  • 收稿日期:2004-02-23 修回日期:1900-01-01 出版日期:2005-11-25 发布日期:2005-11-25

EMA and PSD of Domestic Wide Belt Sander Application in Wood Based Panel Industry

Wang Zheng,Zhu Dianxiang   

  1. Nanjing Forestry University Nanjing 210037
  • Received:2004-02-23 Revised:1900-01-01 Online:2005-11-25 Published:2005-11-25

摘要:

以国产B229型四四砂架人造板双面宽带砂光机为研究对象,从易产生横纹缺陷入手,对其砂架部件、整机等分别采用试验模态分析(EMA)及功率谱密度法(PSD)来开展振动动态特性研究。在模态试验中,采取测量点固定、改变激振点的跑点测量方法,得到固定测量点对各激振点频响函数,并应用SISO频响函数识别法,通过频响函数曲线拟合来完成模态参数识别,获到典型的整机、砂架部件的频响函数图和接触辊的二阶振型图。通过PSD分析,获得砂光机的PSD图谱和激励频率等。

关键词: 试验模态分析, 功率谱密度, 宽带砂光机, 动态设计, 频响函数, 模态参数

Abstract:

The thesis took wide belt sanders, belts four feet wide, two sides belts, model B229, made in China, as studying target. By means of the method of the framework dynamic design, beginning from its produced easily the horizontal lines defect to study its vibration characteristics and undertook respectively EMA (experimental modal analysis) and PSD(power spectrum density) to its sand shelf parts and whole machine etc. The modal test main takes cross spots testing method of fixed testing spots and alters the excitation vibration spots to result in its frequency response function of the fixed spots every excitation vibration spots, moreover applying SISO and taking advantage of frequency response function curve to modify completing mode parameter recognize so that getting its typical frequency response function chart of whole equipment and sand shelf part, as well as two classes mode shapes charts. It got sander's whole amplitude_frequency spectrums through PSD analysis and force frequency etc.

Key words: experimental modal analysis(EMA), power spectrum density(PSD), wide belt sander, dynamic design, frequency response function, modal parameter