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The prediction of noise levels from vibrating structures in the work place is one of considerable importance to the desigl engineer.In this paper a technique for the determination of the noise levels from vibrating panels is discussed.Information regarding the panel's vibration and acoustic characteristics and the room's dimensions and acoustic characteristics form the input to a computer programme which is used to predict equi-noise contours arolmd the structure.The programme has been used to determine noise contours around a vibrating plate in a room in Sheffield City Polytechnic and the results are presented in the paper.Introduct ion stiffened and unstiffened plates play an important part in engineering manufacture with examples being found in machine tool structures, ventilating systems and many other structures.During their life these panels are often subjected to vibrations of a random nature resulting from either localized or distributed loadings.The estimation of the structural response to such loadings is of importance to the design engineer for predicting-for e ample stress and vibration levels and fatigue life.Until recently the problem of noise radiation in the working environment was in many cases not considered to be important.As a result it received little attention at the design stage and when difficulties arose the manufactured structure was modified to reduce the noise levels.
Wearing et al. (Mon,) studied this question.