Naval Postgraduate School
Dudley Knox Library
NPS Dudley Knox Library
View Item 
  •   Calhoun Home
  • Theses and Dissertations
  • 1. Thesis and Dissertation Collection, all items
  • View Item
  •   Calhoun Home
  • Theses and Dissertations
  • 1. Thesis and Dissertation Collection, all items
  • View Item
  • How to search in Calhoun
  • My Accounts
  • Ask a Librarian
JavaScript is disabled for your browser. Some features of this site may not work without it.

Browse

All of CalhounCollectionsThis Collection

My Account

LoginRegister

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

Optimum placement of Helmholtz resonators for damping pressure oscillations.

Thumbnail
Download
Iconoptimumplacement00lloy.pdf (3.032Mb)
Download Record
Download to EndNote/RefMan (RIS)
Download to BibTex
Author
Lloyd, Roger M.
Date
1968-11
Metadata
Show full item record
Abstract
Cold flow and hot firing tests were conducted to find the optimum design and positioning of an acoustic resonator for damping high intensity pressure oscillations. The variables in the cold flow tests were the position of the resonator and its volume. In the hot firings more than one resonator was used and the gas properties were also varying. Pressure node or antinode locations of the resonator were emphasized in the tests and the resonator cavity volume was varied from fully closed to three and a half times the resonant volume calculated by the Helmholtz resonator theory. It was found that the resonator at the pressure node provided little or no damping while when positioned at the pressure antinode the sound intensity in the cold flow duct was reduced to less than 50% of the undamped amplitude. The range of damping was found to be narrow and centered around the volume calculated by the Helmholtz resonator theory. The results of the phase lag between the pressures in the cavity and duct and the velocity in the orifice, connecting the cavity and the tube closely corresponded to those predicted by Sirignano in Reference 14. An investigation of the effective length of the orifice in the Helmholtz resonator indicated that a single end correction was appropriate (rather than the double end correction for conventional acoustic amplitudes) - this also substantiated the jet flow model.
URI
http://hdl.handle.net/10945/12779
Collections
  • 1. Thesis and Dissertation Collection, all items

Related items

Showing items related by title, author, creator and subject.

  • Thumbnail

    Modeling the performance of MEMS based directional microphones 

    Chatzopoulos, Dimitrios. (Monterey, California. Naval Postgraduate School, 2008-12);
    A Micro Electro Mechanical System (MEMS) based directional microphone consisting of two plates hinged at the center is modeled using finite element software. A new method is developed in which the sensor is acoustically ...
  • Thumbnail

    DEVELOPMENT OF PHYSICS LECTURE DEMONSTRATIONS FOR UNDERSEA WARFARE 

    Khan, Faisal A. (Monterey, California. Naval Postgraduate School, 2015-09);
    The importance of educational research is evidenced by many STEM programs (science, technology, engineering, and mathematics), including those by the U.S. Navy. This thesis focuses on the development of new physics lecture ...
  • Thumbnail

    Experimental study of channel-driven cavity flow for fluid-structure interaction 

    Kwon, Y.W.; Arceneaux, S.M. (ASME, 2017-06);
    An experimental setup was designed and fabricated for the channel driven cavity flow in order to provide benchmark data for validation of any numerical analysis program for solving fluid-structure interaction (FSI) problems. ...
NPS Dudley Knox LibraryDUDLEY KNOX LIBRARY
Feedback

411 Dyer Rd. Bldg. 339
Monterey, CA 93943
circdesk@nps.edu
(831) 656-2947
DSN 756-2947

    Federal Depository Library      


Start Your Research

Research Guides
Academic Writing
Ask a Librarian
Copyright at NPS
Graduate Writing Center
How to Cite
Library Liaisons
Research Tools
Thesis Processing Office

Find & Download

Databases List
Articles, Books & More
NPS Theses
NPS Faculty Publications: Calhoun
Journal Titles
Course Reserves

Use the Library

My Accounts
Request Article or Book
Borrow, Renew, Return
Tech Help
Remote Access
Workshops & Tours

For Faculty & Researchers
For International Students
For Alumni

Print, Copy, Scan, Fax
Rooms & Study Spaces
Floor Map
Computers & Software
Adapters, Lockers & More

Collections

NPS Archive: Calhoun
Restricted Resources
Special Collections & Archives
Federal Depository
Homeland Security Digital Library

About

Hours
Library Staff
About Us
Special Exhibits
Policies
Our Affiliates
Visit Us

NPS-Licensed Resources—Terms & Conditions
Copyright Notice

Naval Postgraduate School

Naval Postgraduate School
1 University Circle, Monterey, CA 93943
Driving Directions | Campus Map

This is an official U.S. Navy Website |  Please read our Privacy Policy Notice  |  FOIA |  Section 508 |  No FEAR Act |  Whistleblower Protection |  Copyright and Accessibility |  Contact Webmaster

Export search results

The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

A logged-in user can export up to 15000 items. If you're not logged in, you can export no more than 500 items.

To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.