Sound quality analysis of the combined aerodynamic and power transmission noise with application to rotorcraft interior response

摘要

Acoustic signatures of aerodynamic and power transmission noise sources are very different.Special combination of sound quality metrics is needed to explain their combined effect. Tostudy this problem more in-depth, the rotorcraft passenger cabin noise example is analyzed as itis dominated by both types of responses. The aim of this study is to identify which class ofmetrics is the best quality predictor for sound fields with combined aerodynamic and powertransmission responses. To achieve this goal, a series of jury evaluation tests based on the pairedcomparison analysis are performed on a wide variety of rotorcraft interior sounds as stimuli. Atthe same time, various new and existing sound quality metrics were computed from themeasured sound data. A multivariate regression analysis was applied to determine a suitablepredictor model that correlates well with the normalized mean jury preference scores. Theresults, not only provided a better understanding of the controlling attributes in the combinedaerodynamic and power transmission sound field, it can be used as a guide to identify the class ofmetrics that provides a reliable measure of subjective response.