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Ships and marine technology - Determination of the shaft power of ship propulsion systems by measuring the shaft distortion - Part 2: Optical reflection method
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Basic data
| Standard ID | GB/T 41894.2-2022 (GB/T41894.2-2022) |
| Description (Translated English) | Ships and marine technology - Determination of the shaft power of ship propulsion systems by measuring the shaft distortion - Part 2: Optical reflection method |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | U40 |
| Classification of International Standard | 47.020.20 |
| Word Count Estimation | 14,113 |
| Date of Issue | 2022-10-14 |
| Date of Implementation | 2022-10-12 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 41894.2-2022: Ships and marine technology - Determination of the shaft power of ship propulsion systems by measuring the shaft distortion - Part 2: Optical reflection method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Ships and marine technology -- Determination of the shaft power of ship propulsion systems by measuring the shaft distorsion -- Part 2.Optical reflection method
ICS 47.020.20
CCSU40
National Standards of People's Republic of China
Ship and Offshore Technology by Measuring Shaft Deformation
Determining the shaft power of the ship's propulsion system
Part 2.Optical reflection method
(ISO.20083-2.2019, IDT)
Published on 2022-10-12
2022-10-12 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
drafted.
This document is part 2 of GB/T 41894 "Determination of Shaft Power of Ship Propulsion System by Measuring Shaft Deformation in Ships and Offshore Technology"
point. GB/T 41894 has released the following parts.
--- Part 2.Optical reflection method;
--- Part 3.Elastic vibration method.
This document is identical to ISO.20083-2.2019 "Ship and Offshore Technology Determination of Shaft Power of Ship Propulsion System by Measuring Shaft Deformation"
Rate Part 2.Optical Reflection Method.
Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed and managed by the National Marine Machinery Standardization Technical Committee (SAC/TC137).
This document is drafted by. China Shipbuilding Industry Research Institute of Comprehensive Technology and Economics, Guangdong Institute of Intelligent Robots.
The main drafters of this document. Qi Chao, Wang Huijun, Zhao Chenning, Ma Qiang, Wang Cong, Lao Yijia, Chen Huiling, Zhang Yue, Yang Lian, Yang Qianqian, Zhang Guojun,
Zhao Jin, Zhou Xiaoxiao.
Introduction
Choosing the optimum power for the main engine of the ship is very important for the ship owner as it greatly affects the operation, maintenance and management of the ship
cost.
Measuring the output power of a ship's main engine is important to ensure the efficiency of the ship. Methods for measuring host output power include.
a) measure the deformation of the drive shaft;
b) Determination of fuel consumption;
c) Observe the host indicators, such as cylinder pressure, etc.
Among these methods, it is a common measurement method to determine the shaft power of ship propulsion system by measuring the shaft deformation. measured by this method
Shaft power is designed to.
a) Provide measurement data of the output power of the main engine of the ship;
b) provide relevant information on the best speed of the ship;
c) select the optimal host operating characteristics;
d) estimated repair and maintenance costs;
e) Monitoring the operation of large propellers.
GB/T 41894 "Determination of Shaft Power of Ship Propulsion System by Measuring Shaft Deformation for Ships and Offshore Technology" is intended to consist of the following parts.
--- Part 1.General. The purpose is to establish the general principle of determining the shaft power of the ship's propulsion system by measuring the shaft deformation.
--- Part 2.Optical reflection method. The purpose is to establish the determination of shaft work of ship propulsion system by measuring shaft deformation by optical reflection method.
rate program.
--- Part 3.Elastic vibration method. The purpose is to establish the determination of shaft work of ship propulsion system by measuring shaft deformation by elastic vibration method.
rate program.
Ship and Offshore Technology by Measuring Shaft Deformation
Determining the shaft power of the ship's propulsion system
Part 2.Optical reflection method
1 Scope
This document establishes procedures for determining shaft power in marine propulsion systems by measuring shaft deflection using optical reflectors. This article
The article gives the measurement principle, device composition and calculation method. This document also describes the determinants of measurement accuracy, including calibration procedures, and refers to
Onboard documentation of the equipment is determined.
2 Normative references
There are no normative references in this document.
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
shaft
The propeller shaft or intermediate shaft that transmits engine power to the propeller and is fitted with a shaft dynamometer measuring element.
3.2
shaft torque
The rotational torque generated by the engine is transmitted to the shaft to drive the propeller in rotation.
Note. expressed in Newton meters (N m).
3.3
shaft power shaftpower
Ps
The power generated by the engine is transferred to the shaft to drive the propeller in rotation.
Note. Expressed in kilowatts (kW).
4 Measuring principle
Shaft dynamometers are instruments that measure shaft rotational speed and shaft torsional deformation caused by shaft torque. Shaft power (PS) is calculated according to formula (1).
PS=
2πNQ
60 ×
(1)
where.
N ---shaft speed, the unit is revolution per minute (r/min);
...
