DEVELOPMENT OF SOUND PRESSURE LEVEL INTEGRAL SENSITIVITY AND ITS APPLICATION TO VEHICLE INTERIOR NOISE-REDUCTION

One of the authors has already formulated the sensitivity analysis for a coupled structural-acoustic system and applied the method in order to obtain modal sensitivities and modal frequency response sensitiviti es for the sound pressure level at peak frequency points. However, for the development of a vehicle, not only the reduction of peak frequenc y level but also that of integral of noise for a specified frequency r ange is desired. For investigating this it is considered effective to use sensitivities of integrated sound pressure level for a specified f requency range. Thus a ''sound pressure level integral'' has been deve loped, which is the integrated value of sound pressure level, and furt her ''sensitivity of sound pressure level integral''. Shows how an int egral analysis process is performed, and how vibration and noise can b e reduced.