PROPELLER AND WAKE NOISE IN DEEP SEA SUBMERSIBLES. PART I. TRANSMISSION OF SOUND THROUGH A WIRE GAUZE IN STEADY FLOW,
Abstract
The transmission of sound across a wire grid located cross-sectionally in a small tube carrying a low velocity flow is studied. A brief history of this and related problems is presented together with a technical justification for the present research. The physical arrangement of the wire grid and tube is presented and the assumptions necessary for writing linearized perturbation equations are discussed. The equations are given and a derivation of a subsequent equation involving the steady flow velocity, screen constant, acoustic frequency, and sound transmission coefficient is outlined. The interpretation of this equation in terms of the limiting case of no flow is discussed. Numerical solutions of the equation are presented and briefly interpreted in terms of air flow. An extension to the case of other flowing fluids is also outlined. Experimental results obtained to date are presented and some of the measurement problems are discussed. Plans for future analytical and experimental studies and possible applications for deep submersible vehicles are given. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1968
- Accession Number
- AD0681854
Entities
People
- C. C. Carswell
- G. A. Russell
- S. N. B. Murthy
Organizations
- University of Massachusetts Amherst