A hub air tightness detection data real-time analysis and leakage point positioning method and system

Abstract

This invention discloses a method and system for real-time analysis of wheel hub airtightness testing data and leakage point location, specifically relating to the field of acoustic leakage detection technology. It addresses the problem of leakage point location deviation caused by virtual sources generated by impacts on the inner wall of the wheel hub airtightness testing. By setting a reference acoustic sensor on the inner wall of the wheel hub and simultaneously collecting data with multiple measuring acoustic sensors within the annular cavity, cross-power spectrum analysis is performed on the reference and measured acoustic signals to construct an instantaneous phase difference plane. This identifies structural acoustic components with phase step-like abrupt changes aligned with the arrival time of the impulse wave packet. Based on the geometric distance relationship between the inner wall of the wheel hub and the outer wall of the wheel hub, the direct impact structural acoustic components are separated and filtered out. The residual acoustic signal is used as the direct wave of the leakage hole jet for time-difference location, thereby eliminating the interference of virtual sources on the location results and pointing the leakage point to the actual leakage hole location.

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