MAKING THE MOST OF MODEL TESTING

Much routine tank-testing is wasted by the failure of the parties concerned (ship owner, builder, tank, propeller designer, and--if any--consultant) to appreciate what can really be achieved and how to obtain it with minimum time and effort, and in this paper the Author (the Superintendent of the Vickers Tank at St. Albans and of the Denny Tank at Dumbarton) presents his views on how to make the most of model testing during the design stages of a new ship. (Tank methods and techniques are not discussed as such). In the design of a new ship, the primary function of an experiment tank is to supply a testing service. The tests results need to be complemented with an informed commentary, together with advice on the assessed quality of the design and its acceptability for the required performance; a tank's secondary function is therefore to provide a consultancy service, and this may, in some cases, be supplemented by a third function, that of a design service. The paper is mainly concerned with the testing service, and the principal types of tank experiment are discussed under the headings:--Resistance; Propulsion; Propellers in Open Water; Wake and Flow Visualisation; Seakeeping; and Manoeuvring. (Cavitation tunnel tests are outside the scope of the paper). Customers have different approaches to tank tests; these approaches are discussed. The various types of tank experiment can be combined in very many ways to form a test programme, and this should be drawn up, and agreed by all concerned, as early as possible in the design process. To avoid delays when decisions are needed, the programme should include numerical definitions of "satisfactory" and "unsatisfactory", in relation to agreed standards. The programme is further discussed, together with some comments on the cost of testing. This cost is still very small fraction of the initial and operating costs of the ship, and is an insurance against failure to meet a contract speed, excessive fuel consumption, vibration damage at the stern, and sea damage at the bow. Liaison between customer and tank should not cease when the tank tests have been completed. Tanks are just as interested as the ship owner, builder, and designer in whether performance predictions are borne out in practice. Orde from BSRA as No. 53,397.

  • Supplemental Notes:
    • From the Proceedings of the Stone Manganese Marine/Newcastle University Conference "Model Experiments as an Aid to Advanced Propulsion", 24-27 September 1979.
  • Corporate Authors:

    Newcastle upon Tyne University, England

    Claremont Tower, Claremont Road
    Newcastle NE1 7RU, Tyne and Wear,   England 
  • Authors:
    • Moor, D I
  • Publication Date: 1979

Media Info

  • Features: References;
  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00316728
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Paper No. 5 Conf Paper
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM