空冷桥架风机随机扰力模型

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (10) : 105-110.

论文

空冷桥架风机随机扰力模型

刘挺，徐亚洲，白国良

作者信息 +

The random oscillation force model of fans on air-cooling bridges

LIU Ting，XU Ya-zhou，BAI Guo-liang

Author information +

文章历史 +

摘要

分析不同转速下直接空冷风机桥架振动实测速度响应表明，传统简谐扰力作用的振动响应不能反映实测振幅、相位缓慢变化的窄带随机特性；采用载波理论建立的风机扰力模型可有效反映桥架振动的随机性。结合风机桥架振动时、频域分析结果，以速度响应功率谱为目标识别扰力模型参数。模拟结果表明，扰力模型标准差随风机转速增加而增大。

Abstract

The traditional harmonic oscillation force model can’tpredict the narrowband random characteristics of themeasuredvibration velocities of direct air coolingfanbridge.Consequently, a random oscillation force model based on the carrier theoryis proposed totake the slowly varying amplitudes and phases of the tested velocities into account.Combined with the analysesin time and frequency domains,the model parametersare identified withthe power spectrumofvelocitiesas the target.The results show that the standard differential of the random oscillation force model increases with the increasing rotation speeds of the fans.

导出引用

刘挺，徐亚洲，白国良. 空冷桥架风机随机扰力模型[J]. 振动与冲击, 2015, 34(10): 105-110

LIU Ting，XU Ya-zhou，BAI Guo-liang. The random oscillation force model of fans on air-cooling bridges[J]. Journal of Vibration and Shock, 2015, 34(10): 105-110

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