Accession Number : AD0638501

Title :   VIBRATION TRANSMISSION OF FLEXIBLE PIPE COUPLINGS INFLUENCED BY THE ELEMENTS OF A TRIM-PUMP SYSTEM.

Descriptive Note : Research and development rept.

Corporate Author : NAVY MARINE ENGINEERING LAB ANNAPOLIS MD

Personal Author(s) : Hirsch,Ronald C.

Report Date : SEP 1966

Pagination or Media Count : 53

Abstract : An analytical-experimental study was performed to determine the sound transmission characteristics of a flexible coupling in a trim-pump system. Mechanical impedance methods were used to compare the structural path to the hull via resilient mounts and foundation to the structural path via flexible coupling and pipe hanger. Also investigated were the vibration characteristics of an Electric Boat and MEL flexible coupling under pressurized and unpressurized conditions. Results showed that the sound transmission viaflexible coupling and pipe hanger exceeded the sound transmission via the mount and foundation and would negate the isolation effectiveness of the primary mounting system. The results of comparing the two types of flexible coupling showed that the Electric Boat Coupling exhibited better total noise attenuation characteristics than did the MEL coupling. However, the MEL coupling showed a unique inherent characteristic of improved attenuation capabilities with increased pressure loading. (Author)

Descriptors :   (*FLEXIBLE COUPLINGS, SOUND TRANSMISSION), VIBRATION, PIPES, VIBRATION ISOLATORS, FOUNDATIONS(STRUCTURES), PUMPS, SUBMARINE HULLS

Subject Categories : Couplers, Fasteners, and Joints
      Submarine Engineering
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE