Analysis of Full-Period and Non-full-Period Sampling of Vibration Signal for Engine Rotors

摘要

In this paper, some main software implementations concerning full-period sampling and non-full-period sampling are cited. Re-sampling technique based on cubic spline interpolation and harmonic analysis algorithm are representative methods of respectively full-period sampling and non-full-period sampling. The advantages and limitations of the two methods are compared by means of MATLAB simulation and experiment. Analysis of results finds that the re-sampling technique can completely restore the periodical signals and effectively avoid spectral leakage and fence effect, but it needs a large amount of operations. When synchronous error is considerable the compute of period can be inaccurate. Harmonic analysis algorithm of non-full-period sampling can avoid spectral leakage caused by synchronization error and has a great tolerance for deviation. Moreover, it can make the harmonic analysis surpass the Shannon theorem. However, it can only analyze integer multiple frequency signal.