一种多测点变工况倍频程快速处理方法
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摘要
针对传统倍频程分析方法处理多测点变工况振动噪声数据耗时费力的不足,提出一种改进的适用于多测点变工况振动噪声数据快速处理的倍频程方法。首先对整个试验过程所有测点的数据进行分块倍频程处理,然后利用工况参数确定稳定工况,根据稳定工况的起止时间计算对应的性能参数均值及连续频段振级均值,最后,以判定工况的性能参数为索引将各测点相同工况的性能参数均值及连续频段振级均值比邻放置,得到满足统计要求的3D统计矩阵。工程应用表明,采用改进算法不但大大提高了试验数据的分析效率,而且相对传统算法明显提高了分析深度。
To solve the time-consuming and laborious problem in processing the off-design vibration and noise data from multiple channels through the traditional constant proportional bandwidth(CPB) method,an improved CPB method is proposed.Firstly,the data from all channels are divided into multi-segment,and each segment is calculated via octave algorithm based on fast Fourier transform(FFT) algorithm.Secondly,technical parameter mean and average octave sequence are calculated according to the starting and ending time corresponding to the stable condition determined by the condition parameter curve.Finally,technical parameter mean and average octave sequence of the same working condition are adjusted to the adjacent columns by indexing the condition-determining parameters.Engineering applica-tion shows that the analysis efficiency and depth of test data are improved significantly.
To solve the time-consuming and laborious problem in processing the off-design vibration and noise data from multiple channels through the traditional constant proportional bandwidth(CPB) method,an improved CPB method is proposed.Firstly,the data from all channels are divided into multi-segment,and each segment is calculated via octave algorithm based on fast Fourier transform(FFT) algorithm.Secondly,technical parameter mean and average octave sequence are calculated according to the starting and ending time corresponding to the stable condition determined by the condition parameter curve.Finally,technical parameter mean and average octave sequence of the same working condition are adjusted to the adjacent columns by indexing the condition-determining parameters.Engineering applica-tion shows that the analysis efficiency and depth of test data are improved significantly.
引文
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[3]王文斌,刘维宁,马蒙,等.梯形轨道系统动力特性及减振效果试验研究[J].中国铁道科学,2010,31(2):24-28.Wang Wei-bin,Liu Wei-ning,Ma Meng,et al.Expe-ri-mental Study on the Dynamic Characteristics and theVibration Mitigation Effect of Ladder Track System[J].China Railway Science,2010,31(2):24-28.
[4]葛勇,张希黔,严春风,等.无砟轨动车组运行激励场地振动谱分析[J].地震工程与工程振动,2010,30(1):15-21.Ge Yong,Zhang Xi-qin,Yan Chun-feng,et al.A Test ofthe Ground Vibrations Induced by Ballastless TruckRunning[J].Journal of Earthquake Engineering and En-gineering Vibration,2010,30(1):15-21.
[5]李联玉,马孝江,蔡庆喜.“以振代噪”在汽车变速箱性能检测中的应用研究[J].机床与液压,2004(7):156-157.Li Lian-yu,Ma Xiao-jiang,Cai Qin-xi.Application andResearch of“Substituting Vibration for Sound”App-roach in Test for Performance of Motorcar-Gearbox[J].Machine Tool&Hydraulics,2004(7):156-157.
[6]袁云龙,袁超勇,杨超珍.频段能量统计法在机械设备工作状态监测中的应用[J].轻工机械,2010,28(2):85-88.Yuan Yun-long,Yuan Chao-yong,Yang Chao-zhen.App-lication of Frequency Band Energy Statistics Method toMonitoring the Work Conditions of Mechanical Equip-ment[J].Light Industry Machinery,2010,28(2):85-88.
[7]王济,胡晓.MATLAB在振动信号处理中的应用[M].北京:中国水利水电出版社,2006.
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