【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。更多还原

【Abstract】 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.更多还原