The primary purpose of speed and power trials is to determine a ship\u2019s performance in terms of ship\u2019s speed, power and propeller shaft speed under prescribed ship\u2019s conditions and thereby verify the satisfactory attainment of a ship\u2019s speed stipulated by EEDI regulations and\/or contract.<\/p>\n
This International Standard defines and specifies the following procedures to be applied in the preparation, execution, analysis and reporting of speed trials for ships, with reference to the effects which may have an influence upon the speed, power and propeller shaft speed relationship:<\/p>\n
the responsibility of each party involved,<\/p>\n<\/li>\n
the trial preparations,<\/p>\n<\/li>\n
the ship\u2019s condition,<\/p>\n<\/li>\n
the limiting weather and sea conditions,<\/p>\n<\/li>\n
the trial procedure,<\/p>\n<\/li>\n
the execution of the trial,<\/p>\n<\/li>\n
the measurements required,<\/p>\n<\/li>\n
the data acquisition and recording,<\/p>\n<\/li>\n
the procedures for the evaluation and correction,<\/p>\n<\/li>\n
the processing of the results.<\/p>\n<\/li>\n<\/ul>\n
The contracted ship\u2019s speed and the ship\u2019s speed for EEDI are determined for stipulated conditions and at specific draughts (contract draught and\/or EEDI draught). For EEDI, the environmental conditions are: no wind, no waves, no current and deep water of 15\u00b0C.<\/p>\n
Normally, such stipulated conditions are unlikely to be experienced in part or in full during the actual trials. In practice, certain corrections for the environmental conditions such as water depth, surface wind, waves, current and deviating ship draught, have to be considered. For this purpose, during the speed and power trials, not only are shaft power and ship\u2019s speed measured, but also relevant ship data and environmental conditions.<\/p>\n
The applicability of this International Standard is limited to ships of the displacement type.<\/p>\n
In this International Standard, it was decided that the unit to express the amount of an angle should be \u201crad\u201d (radian) and that the unit of speed should be \u201cm\/s\u201d (metres per second). Nevertheless, \u201c\u00b0\u201d (degree) as a unit for an angle and \u201cknots\u201d as a unit for speed may be used. However, the units for the angles and speeds which appear in calculation formulas are to be \u201crad\u201d and \u201cm\/s\u201d without exception. Moreover, for the convenience of the users of this International Standard, numerical values using the units of degree and knots are stated jointly at appropriate places.<\/p>\n
If it is physically impossible to meet the conditions in this International Standard, a practical treatment is allowed based on the documented mutual agreement among the Owner, the Verifier and the Shipbuilder.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1\tScope <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 2\tNormative references 3\tTerms and definitions <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4\tSymbols and abbreviated terms 4.1\tSymbols <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 4.2\tAbbreviated terms 5\tResponsibilities 5.1\tShip builders\u2019 responsibilities <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.2\tThe Trial Team 6\tTrial preparations 6.1\tStep 1: Installation and Calibration <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6.2\tStep 2: S\/P trial agenda and pre-trial meeting <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 7\tShip\u2019s condition 7.1\tDisplacement 7.2\tTrim 7.3\tHull and propeller 8\tTrial boundary conditions <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 8.1\tLocation 8.2\tWind 8.3\tSea state <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 8.4\tWater depth <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 8.5\tCurrent 9\tTrial procedures 9.1\tParameters that shall be recorded 9.2\tParameters measured during each run <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 9.3\tParameters measured at the speed trial site 9.4\tGeneral information 9.5\tTank test information <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 9.6\tScope and conduct of the measurements 9.6.1\tShip track and speed over ground 9.6.2\tTorque 9.6.3\tWind 9.6.4\tWater depth 9.6.5\tWaves <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 9.6.6\tTemperature and density 9.6.7\tCurrent 10\tConduct of the trial 10.1\tInitiation 10.2\tShip\u2019s track during trial <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 10.3\tRun duration and timing 10.4\tTrial direction 10.5\tSteering 10.6\tApproach 10.7\tNumber of speed runs 10.7.1\t\u2018Iterative\u2019 method <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 10.7.2\t\u2018Mean of means\u2019 method 11\tData acquisition <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 11.1\tGeneral data 11.2\tData on each run <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 11.3\tAcquisition system 11.3.1\tMinimum data 11.3.2\tSystem requirements <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 11.3.3\tLocation 11.4\tManual data collection <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 12\tAnalysis procedure 12.1\tGeneral remarks 12.2\tDescription of the analysis procedure <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 12.2.1\tResistance data derived from the acquired data 12.2.2\tEvaluation of the acquired data <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 12.2.3\tEvaluation based on Direct Power Method <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 12.2.4\tCorrection of the measured ship\u2019s speed due to the effect of current <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 12.2.5\tCorrection of the ship\u2019s speed due to the effects of shallow water 12.2.6\tCorrection of the ship\u2019s performance due to the effects of displacement 12.2.7\tConversion of power curve from trial condition to full load\/stipulated condition 13\tProcessing of the results <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | 14\tReporting <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | 15\tExample of speed trial data analysis <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Annex\u00a0A (normative) General information and trial log sheet <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Annex\u00a0B (normative) Beaufort scale for wind velocity <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Annex\u00a0C (normative) Resistance increase due to wind <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | Annex\u00a0D (normative) Resistance increase due to waves <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | Annex\u00a0E (normative) Effect of water temperature and water density <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | Annex\u00a0F (normative) Effect of current <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | Annex\u00a0G (normative) Effect of shallow water <\/td>\n<\/tr>\n | ||||||
| 75<\/td>\n | Annex\u00a0H (normative) Effect of displacement <\/td>\n<\/tr>\n | ||||||
| 76<\/td>\n | Annex\u00a0I (normative) Conversion from trial condition to other stipulated load conditions <\/td>\n<\/tr>\n | ||||||
| 78<\/td>\n | Annex\u00a0J (normative) Derivation of load variation coefficients <\/td>\n<\/tr>\n | ||||||
| 83<\/td>\n | Annex\u00a0K (informative) Analysis of direct power method <\/td>\n<\/tr>\n | ||||||
| 93<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Ships and marine technology. Guidelines for the assessment of speed and power performance by analysis of speed trial data<\/b><\/p>\n |