Measurement and Assessment on the Shaft Power Measurement of Diesel Engine using Strain Gauge in Marine Vessel

The need for power measurement transmitted by the running shaft has led to the need for using devices for measuring torque on the shaft. Of particular importance is the power measurement on high-speed machines, wherein some cases conventional measurement systems are either unsuitable or have low accuracy. Currently, data measuring systems are widely used in the researches of turbomachines. They allow to receive, process, transmit, store and display measurement data. Their application is relevant in relation to the priority of experimental study and subsequent modeling of characteristics and performance factors of expansion machines. The purpose of this research is a design and generation of the data measuring system for measuring torque on the running shaft of vortex expansion machines using a non-contact torsional dynamometer (strain-gauge clutch). The research has considered the results of the development of data measuring system, performed a theoretical analysis and presented the results of the practical application of the non-contact strain-gauge dynamometer designed for torque measurement on the shaft of low-power expansion machines when operating under bench test conditions. Has dealt with the problems of development, calibration. Keywords: data measuring system, torque, coupling, resistive-strain sensor, vortex expansion machine.

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Behavior tests of a new form of propulsion after ship reconstruction

Scientific Technical Review ◽

10.5937/str2002047d ◽

2020 ◽

Vol 70 (2) ◽

pp. 47-52

Author(s):

Enis Dauti ◽

Dragan Trifković

Keyword(s):

Diesel Engine ◽

Electric Propulsion ◽

Test Results ◽

Test Program ◽

Stopping Distance ◽

Shaft Power ◽

The Subject ◽

Ship Operation ◽

Circle Diameter ◽

Ship Speed

The subject of this paper is a detailed qualitative analysis maneuvering and propulsion characteristics of a special purpose river vessel "KOZARA" River war flotillas of the Serbian Army, after reconstruction and modernization. With the modernization of the ship, among other things, the old propulsion group with a classic diesel engine propulsion was replaced by a new diesel electric propulsion. In order to assess the justification of this replacement from the aspect of expected improvements of shunting and propulsion characteristics of the ship, it was necessary to develop and implement a test program and compare the results with available test results of the ship with the old propulsion group in earlier periods of ship operation. The results of measuring the basic maneuvering characteristics: ship speed, stopping distance and turning circle diameter, as well as propulsion characteristics: propeller shaft power, axial and torsional vibrations after six years of operation of the new propulsion confirmed all the advantages of diesel electric propulsion over classic diesel engine propulsion. However, certain problems have been noticed in terms of maintaining this complex plant, and proposed measures to overcome them.

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Implementation of a 3.5 kW resistive load bank for a single-cylinder diesel engine test bench

Scientia et technica ◽

10.22517/23447214.22881 ◽

2020 ◽

Vol 25 (4) ◽

pp. 598-505

Author(s):

Jorge Eliécer Duarte Forero ◽

Miguel Celis Quintero ◽

Gabriel Hernandez Acosta

Keyword(s):

Diesel Engine ◽

Internal Combustion Engines ◽

Test Bench ◽

Thermal Design ◽

Power Measurement ◽

Resistive Load ◽

Engine Test ◽

Engine Test Bench ◽

Element Analysis ◽

Single Cylinder

This article presents the implementation of a 3.5 kW resistive load bank applied to a four-stroke single-cylinder diesel engine test bench that operates with an alternator. With this experimental test bench, it is possible to perform mechanical, thermodynamic, and polluting emissions studies in compression-ignited or induced internal combustion engines. Applying the quantitative research methodology, the design of the electric charging system is carried out. Power control circuits and safety elements are designed for the load back. CAD software is used to design the structure and casing considering anthropometric measurements. Also, finite element analysis (FEA) is incorporated to verify the structural and thermal design criteria. he implementation of an electrical and instrumentation acceleration system for sensing power and torque in low-displacement engines showed a measurement error of less than 1%. Similarly, the FEA allowed to quantify the maximum efforts and guarantee a safety factor above 5. With the characterization of the implemented sensors, a correlation coefficient of up to 99.97% was achieved. The power measurement displayed an error lower than 3%, which leads to a high characterization capacity of any thermal machine with equal power or less than the designed one.

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Non-Contact System Provides Measurement and Management of Shaft Horsepower

ASME 1972 International Gas Turbine and Fluids Engineering Conference and Products Show ◽

10.1115/72-gt-29 ◽

1972 ◽

Author(s):

J. R. Parkinson

Keyword(s):

Measurement Technique ◽

Rotating Machinery ◽

Contact System ◽

Power Measurement ◽

Component Reliability ◽

Field Calibration ◽

Shaft Power

For years, manufacturers and users of rotating machinery have searched for an accurate and easily used shaft power measurement technique. These users wanted a system with characteristics such as non-contact, no field calibration, shaft realignment compensated, adaptable to control and protective functions, plus high component reliability and accuracy. This paper describes such a system.

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Friction and indicated power measurement for diesel engine by ( aerial dynamometer

AL-Rafdain Engineering Journal (AREJ) ◽

10.33899/rengj.2012.47288 ◽

2012 ◽

Vol 20 (2) ◽

pp. 106-115

Author(s):

Mohammad Sami Ahmad

Keyword(s):

Diesel Engine ◽

Power Measurement

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Ships and marine technology � Verification method for portable power measurement using a strain gauge

10.3403/30366159 ◽

2018 ◽

Keyword(s):

Strain Gauge ◽

Power Measurement ◽

Verification Method ◽

Portable Power ◽

Marine Technology

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A Novel Telemetry System for Real Time, Ship Main Propulsion Power Measurement

Sensors ◽

10.3390/s19214771 ◽

2019 ◽

Vol 19 (21) ◽

pp. 4771 ◽

Cited By ~ 3

Author(s):

Michał Bonisławski ◽

Marcin HOŁUB ◽

Tadeusz Borkowski ◽

Przemysław Kowalak

Keyword(s):

Printed Circuit Board ◽

Energy System ◽

Fuel Oil ◽

Circuit Board ◽

Power Measurement ◽

Telemetry System ◽

Oil Consumption ◽

Power Monitoring ◽

Flexible Printed Circuit ◽

Shaft Power

Modern ships are required to increase the energy efficiency and minimize fuel consumption. This paper presents the construction, main properties and exemplary measurement results of a novel system intended for main shaft power monitoring. The telemetry system consists of the stationary part, responsible for wireless supply energy transfer to the rotating part. Additional functions of the stationery unit include radio-based, bidirectional communication with the rotating, microcontroller-based unit, and Modbus-based communication with the graphical user interface. The non-stationary (rotating) part receives the necessary energy using the wireless transmission and performs the torque and speed measurement using strain gauge and a special setup of the wireless energy system. A novel system of flexible printed circuit board (PCB) coils is used for wireless energy transmission and increases the flexibility of the device while minimizing the necessary size, weight, and costs of the setup. The microcontroller unit used for measurements allows proper sampling of highly dynamic signals and can be used for advanced drive system diagnostics or as a typical power monitoring device. Such unit was installed on a ferry and operation was monitored for several sea trips. Main results depict characteristic power data referenced to vessel speed and specific fuel oil consumption (SFOC). Proposed system construction allows to reduce system costs and provides stable readings for long period of operation.

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Full-Scale Measurements of the Propeller Thrust during Speed Trials Using Electrical and Optical Sensors

Applied Sciences ◽

10.3390/app11178197 ◽

2021 ◽

Vol 11 (17) ◽

pp. 8197

Author(s):

Se-Myun Oh ◽

Dong-Hyun Lee ◽

Hyun-Joe Kim ◽

Byoung-Kwon Ahn

Keyword(s):

Optical Sensors ◽

Strain Gauge ◽

Full Scale ◽

Operating Conditions ◽

Measuring Device ◽

Optical Device ◽

Sea Trial ◽

Shaft Power ◽

Oil Tankers ◽

Propeller Thrust

Full-scale sea trials demonstrate a ship’s performance under real operating conditions to confirm whether a ship meets its specifications and requirements. The determination of the performance through a sea trial is the most important stage in the ship design cycle. If one is relying on measurements of propeller shaft power or fuel consumption, the distinction between the propeller and hull efficiencies may not be made. In order to be able to identify the propeller efficiency separate from the hull, full-scale propeller thrust should be accurately measured. In this study, full-scale measurements of the propeller thrust, torque, and revolution for a series of crude oil tankers and twin-skeg LNG carrier were conducted during the speed trials. Two different measuring systems, strain gauge and optical type, were implemented to compare the performance of sensors. As a result, it was shown that the strain gauge type-measuring device matched the model test results relatively well compared to the optical device. Above all, in the case of the optical device, it has been demonstrated that the zero setting is important to increase the accuracy of the full-scale measurements.

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