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M.A.N.'s Research Program: Noise Control M.A.N, research work covers air- and structure- borne noise. Active and passive noise control techniques are being developed. Active techni- ques, such as tuning out the natural frequency of theturbocharging system,eliminate avoidable sources of noise at an early design stage. Passive techniques concentrate on components of the finished engine and make use of intake silencers, inboard air silencers, acoustic trunking, etc. In addition, the engine can be resiliently mounted and even enclosed. To optimize the noise attenuation of the whole plant M.A.N, co-operate with the shipyard. M^N AUGSBURG (W.-GERMANY) American M.A.N. Corporation, 500 Fifth Avenue, Room 5416, New York, N. Y. 10036 30 Maritime Reporter/Engineering News
