GB/T 41894.3-2022 English PDF

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GB/T 41894.3-2022: Ships and marine technology - Determination of the shaft power of ship propulsion systems by measuring the shaft distortion - Part 3: Elastic vibration method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 41894.3-2022	174	Add to Cart	3 days	Ships and marine technology - Determination of the shaft power of ship propulsion systems by measuring the shaft distortion - Part 3: Elastic vibration method	Valid

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Basic data

Standard ID: GB/T 41894.3-2022 (GB/T41894.3-2022)
Description (Translated English): Ships and marine technology - Determination of the shaft power of ship propulsion systems by measuring the shaft distortion - Part 3: Elastic vibration method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: U40
Classification of International Standard: 47.020.20
Word Count Estimation: 10,137
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 41894.3-2022: Ships and marine technology - Determination of the shaft power of ship propulsion systems by measuring the shaft distortion - Part 3: Elastic vibration 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 3.Elastic vibration 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 3.Elastic vibration method (ISO.20083-3.2019, 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 3 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.20083-3.2019 "Ship and Offshore Technology Determination of Shaft Power of Ship Propulsion System by Measuring Shaft Deformation" Rate Part 3.Elastic Vibration 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 National Shipbuilding Industry Research Institute of Comprehensive Technology and Economics, China State Shipbuilding Corporation. The main drafters of this document. Qi Chao, Ji Xing, Chen Huiling, Lao Yijia, Wang Huijun, Wang Cong, Zhao Chenning, Ma Qiang, Zhang Yue, Yang Qianqian, Yang Lian, Ji Jing.

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 specify the use of optical reflection method to measure shaft deformation to determine the shaft power of ship propulsion system. rate program. --- Part 3.Elastic vibration method. The purpose is to stipulate that the elastic vibration method is used to measure the shaft deformation to determine the shaft work of the ship propulsion system. rate program. Ship and Offshore Technology by Measuring Shaft Deformation Determining the shaft power of the ship's propulsion system Part 3.Elastic vibration method

1 Scope

This document establishes the procedure for determining the shaft power of a ship's propulsion system by measuring shaft deformation with an elastic vibration device. This document gives the measurements Principle, device composition and calculation method. This document also describes the determinants of measurement accuracy and specifies equipment onboard documentation.

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). 3.4 sensor sensor An instrument with elastically vibrating material whose natural frequency changes as the length of the material changes.

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); ......

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