International Shipbuilding Progress - Volume 3, issue 24

Authors: Okabe, Toshimasa | Hirata, Kiyoshi | Kumai, Toyoji

Article Type: Research Article

Abstract: The present report deals with the results of the vibration measurements of a 32,000 ton d.w. super tanker on trial trips. All the natural frequencies of the flexural and torsional vibrations up to the blade frequency were observed involving those of small amplitude measured by Geiger vibrographs and by the optical one which was made on trial. Since the measured critical frequencies of the flexural vibration of the hull are almost proportional to the number of nodes in both the ballast and loaded conditions, it is pointed out that the higher modes of hull vibration are considered to be of …shearing vibration. The details of the theoretical investigations on the present observations are not presented except that one of the computed results of the vibration profile of the higher mode of shearing vibration of the hull is quoted as an example. Show more

DOI: 10.3233/ISP-1956-32401

Citation: International Shipbuilding Progress, vol. 3, no. 24, pp. 409-414, 1956

Authors: Feilden, G.B.R. | Thorn, J.D. | Kemper, M.J.

Article Type: Research Article

Abstract: In this paper two aspects of gas-turbine design and operation are dealt with. First, an account is given of the development of special types of “kinematic” construction suitable for accommodating the very large temperature changes encountered when a gas turbine is started and put on load rapidly. Examples are given of the application of this type of construction to representative components of a 750–1,000 kW gas turbine. Secondly, a description is given of the development of combustion chambers to burn fuels ranging from natural gas and gas oil to residual fuels, coal tar fuel and peat. A range of …chambers to burn these fuels has been designed to fit interchangeably on the basic components of the standard turbine. A detailed description is given of the development of a combustion chamber of elbow type which takes advantage of the fact that a number of changes of direction through 90 deg. or more are necessary in the ducting of nearly all industrial gas turbine. Development of this chamber is described from early atmospheric test mod As to the final pressurized combustion chambers which have been fitted to production gas turbines. With only slight adjustments, this type of chamber has shown itself capable of burning hydrocarbon fuels, ranging from natural gas to residual fuel oils, and a modified form of chamber has also successfully burnt low calorific value gases. Show more

DOI: 10.3233/ISP-1956-32402

Citation: International Shipbuilding Progress, vol. 3, no. 24, pp. 415-433, 1956

Authors: Lap, A.J.W.

Article Type: Research Article

DOI: 10.3233/ISP-1956-32403

Citation: International Shipbuilding Progress, vol. 3, no. 24, pp. 434-456, 1956