A REVISION OF A PREVIOUS DISCUSSION ON THE CORRECTNESS OF CURLE’S AND THE FFOWCS WILLIAMS AND HAWKINGS EQUATIONS (Record no. 2581)
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| fixed length control field | 02017nam a22001577a 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | OSt |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20160617151545.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 160617b xxu||||| |||| 00| 0 eng d |
| 040 ## - CATALOGING SOURCE | |
| Transcribing agency | National Acoustic Laboratories |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Zinoviev, Alex |
| 245 ## - TITLE STATEMENT | |
| Title | A REVISION OF A PREVIOUS DISCUSSION ON THE CORRECTNESS OF CURLE’S AND THE FFOWCS WILLIAMS AND HAWKINGS EQUATIONS |
| 520 3# - SUMMARY, ETC. | |
| Summary, etc | It is well known that noise generated by fluid flow around propellers and hulls of maritime platforms significantly contributes to their acoustic signature. The level of this noise is often determined by means of Curle’s and the Ffowcs Williams and Hawkings (FW-H) equations, according to which the noise level depends on the total force acting upon the rigid boundary and the velocity of the boundary. The author and his previous co-author claimed that these equations are incorrect and suggested another equation where the noise level was determined by the acoustic pressure and its normal derivative, i.e. the potential component of velocity, on the boundary. The purpose of this paper is to reconsider the arguments which the author and his co-author presented during the discussion on the correctness of these equations. It is shown that the FW-H equation in the integral form and the equation derived previously by the present author can be obtained from the FW-H equation in the differential form utilising different ways of evaluating integrals of the source terms. It is demonstrated that the equation derived by the author does not contradict the FW-H and Curle’s equations and is another form of these equations expressed via a different set of variables. It is concluded that viscous stresses as well as the rotational component of velocity do not contribute to the acoustic radiation from a rigid boundary in fluid flow. |
| 773 0# - HOST ITEM ENTRY | |
| Title | Acoustics 2015 Hunter Valley 15-18 November 2015 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://dspace.nal.gov.au/xmlui/bitstream/handle/123456789/389/p54.pdf?sequence=1&isAllowed=y">http://dspace.nal.gov.au/xmlui/bitstream/handle/123456789/389/p54.pdf?sequence=1&isAllowed=y</a> |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Universal Decimal Classification |
| Koha item type | Journal article |
No items available.