Accession Number:

ADA038889

Title:

A Study of the Feasibility of Wave Pulse Techniques for Experimental Determination of Added Resistance.

Descriptive Note:

Final rept. 1 Oct 75-31 Dec 76,

Corporate Author:

STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB

Personal Author(s):

Report Date:

1976-12-01

Pagination or Media Count:

73.0

Abstract:

Because the experimental determination of the characteristics of mean ship model resistance added by waves is one of the more difficult and time consuming problems in seakeeping towing tank practice, it was of practical interest to see of a technique involving wave pulses could be developed, and if so, if it promised better efficiency. Toward this end a fairly realistic digital simulation was made of the wave pulse experiment and of the resulting resistance transient. The analysis of the problem was approached from the point of view that in order to be practically attractive, any resulting technique must involve a very few wave pulse runs, preferably only one. In the event, no conceptually clear approach to the analysis of a single resistance transient could be found. By taking advantage of the general properties of the quadratic model which appears to be valid for added resistance, it was possible to develop a dirty approach for the identification of the mean added resistance operator from a single transient experiment. However, no useful results could be obtained with this latter approach. It appears that there is not really enough information in a single resistance transient to enable even the identification of the mean added resistance operator. It also appears that if there is a practical wave pulse technique for added resistance experiments it is not yet in hand. Author

Subject Categories:

  • Marine Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE