An Accurate Computation Method of Vibration Level Based on Comb Band-stop Filter

The existing 1/3 octave spectrum approaches are usually supposed to test signals without interference. Obviously, this strategy is no more effective when confronted with the signals containing band noise. In this paper, aiming at the regular noise interference, such as comb noise, the Fourier kernel function is employed to construct a comb band- stop filter, and further the filter is combined with the 1/3 octave spectrum to remove the effects exerted by noise. The proposed strategy can remove the interference in frequency domain and calculate the filtered vibration level more efficiently and conveniently, compared with the existing approaches. For the vibration signals with regular noise interference in the power test of a propulsion system, proper revision and consequent reevaluation can avoid repeated tests and save test costs