Community Research and Development Information Service - CORDIS

Work methods for the development of quiet products

A formal methodology was developed describing most relevant information and procedures required during any product design process. Acoustically relevant product data was mapped using the EXPRESS language and procedures were described using the structured analysis and design technique (SADT). Prototype software for a consulting system for low noise design was developed. This system uses the 'component based noise path model' as a means to acoustically model any machine, and to associate any type of qualitative or quantitative information with that model. Help, database, and calculation facilities were developed. The system runs on Windows 95 and NT personal computer (PC). Two measurement methods for characterization of structure-borne noise sources were developed, one dependent on the test environment, the reception structure method, the other independent of the test environment, the pseudo-forces method. In parallel to the methodology development noise control work carried out on 3 different types of machine: excavators, municipal vehicles and water chillers. Noise reductions of 5-11 dB(A) were achieved by applying the methodology in a systematic way.

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TNO - Institute Of Applied Physics
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