Page 550 - Practical Design Ships and Floating Structures

Practical Design of Ships and Other Floating Structures 525
You-Sheng Wu, Wei-Cheng Cui and Guo-Jun Zhou (Eds)
6 200 I Elsevier Science Ltd. All rights reserved

EVALUATION AND COMPUTER PROGRAM ON THE SPEED
TRIAL ANALYSIS METHOD OF THE ONGOING WORK IN
ISO/TCS

Eun-Chan Kim', Hyun Se Yoon', Sa Young Hong', Yoon-Rak Choi'

' Korea Research Institute of Ships and Ocean Engineering,
P. 0. Box 23 Yusung, Taejon, 305-600, Korea

ABSTRACT

The IS0 Draft International Standard 15016, entitled "Guidelines for the assessment of speed and
performance by analysis of speed trial data", was developed by the working group ISO/TC WSC 91WG
2. This paper presents the structure of computer program based on the ISOlDIS 15016. The computer
program is constructed to optimize the structure, to emphasize the graphic function and to implement
the GUI at WINDOWS environment. Various analysis methods for resistance increase due to ship
motion, wave diffraction, wind, steering, drifing, water tempera- and salt content, deviation of
displacement, hull and propeller surface roughness, and shallow water effects are contained in this
computer program. The output result of this computer program was compared with an example of
ISO/DIS 15016.

KEYWORDS
ISO, Speed, Trial, Analysis, Program, Resistance, Increase, Wave, Wind

1 INTRODUCTION

Four objectives of speed trials are described in the report of the Performance Committee of the 16th
ITTC. Four objectives are to fulfill contractual obligation, to obtain performance data, to determine the
relationship between ship speeds and propeller revolutions, and to obtain ship-model correlation
allowance. To fulfill contractual obligation, the primary purpose of speed trials is determining ship
performance in terms of speed, power and propeller revolution under prescribed ship conditions. The
speed trial results should be analyzed under the contractually stipulated conditions which usually are
no wind, no wave, no current, deep water, smooth hull and smooth propeller surface conditions.
The ISOlDIS 15016 (ISO/TCS, 2000), entitled "Guidelines for the assessment of speed and
performance by analysis of speed trial data", was developed by the working group ISO/TC 8/SC 91WG
2. This guideline contains a basic procedure for the speed loss and various procedures for correction of
speed trials covering all influences. Several methods are suggested to correct all influences in this
guideline.