1964-01-01

THE CHAMBERED PIPE SILENCING CONCEPT OF EXHAUST SYSTEM DESIGN 640125

This paper presents a summary of the development of the “Chambered Pipe” silencing concept. Present trends of automotive design dictate a change from conventional mufflered systems. One such trend is toward high performance in low profile bodies, while another related trend is toward compact cars. By approaching the silencing problems from a more theoretical basis, small diameter acoustic elements of low pressure drop have been developed to satisfy the exhaust system requirements of modern automobiles.
The paper discusses the theoretical basis for the “Chambered Pipe” silencing system approach and shows resolutions of actual test data to the theoretical analysis. Test data showing the effect of optimum placement of silencing units in actual hot gas flowing systems are presented and discussed. The advantages in space required for installation, sound characteristics, low power loss, strength, weight, and better life are explained. New manufacturing techniques used in fabricating systems are discussed, and finally several typical systems are shown and compared to the conventional mufflered systems.

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