The animation and evaluation of operational deflection shapes often forms an important analysis tool for troubleshooting structural noise problems. Classical techniques make use of one reference transducer and assume the whole structure is behaving coherently. However, when multiple uncorrected sources are exciting the structure, the operating behaviour cannot be described by 1 deflection shape. Principal component analysis extracts more information from the operating data, by entering the concept of dimensionality of the operating phenomena. The method structures the information from multiple reference points and makes it possible to describe a vector space of operating deflections in a unique way. The applicability of the method is demonstrated by a case study concerning a road/tyre noise problem in a passenger car.
展开▼
