DESIGN OF DETECTOR OF INTERNAL COMBUSTION ENGINE’S CRANKSHAFT TORSIONAL VIBRATIONS BASED ON ACCELEROMETER METHOD

Oleksander Veretennik,Dmitry Kardashev,Sergey Aboleshkin

doi:10.21303/2585-6847.2019.001048

Abstract

Detector of internal combustion engine’s crankshaft torsional vibrations based on accelerometer method is designed. It consists of a measuring and transmitting part, which is mounted on the crankshaft of a diesel engine or the propeller shaft of a vessel and a receiving and recording part placed remotely. The measuring and transmitting parts of detector is easily mounted on area of the shaft of the vessel important for the measurement, which are difficult to access for other methods of vibration measuring. It allows directly in real time to measure the tangential accelerations of the shaft without interfering in the propulsion unit work. Carrying out such measurements allows to control the arising torsional stresses and signalling the excess of their safety limit. The measurement results of engine's pulsations of rotation of the crankshaft, arising during operation, allow to watchkeeping engineer to analyze the quality of the working process of each engine’s cylinder in real time and at different operating modes of the vessel. This analysis makes it possible to assess the technical condition of the engine’s parts and assemblies (cylinder liner, piston, o-rings), the quality of the fuel equipment of the diesel engine and, in general, allows to control the technical condition of the entire engine.

Highlights

DESIGN OF DETECTOR OF INTERNALFig. 1 shows a block diagramThe appearance during the operation of a ship’s propulsion unit of torsional vibrations of ship shaft lines causes danger-COMBUSTION ENGINE’S CRANKSHAFT TORSIONAL VIBRATIONS BASED ON ACCELEROMETER METHODof measuring the instantaneous value of the angular acceleration of the shaft.The moment of inertia of ous dynamic loads in this unit, Oleksander Veretennik the mass and the moment of which can lead to damage to el-Doctor of Engineering Sciences, Professor resistance are determined by ements of power plants that pro- Dmitry KardashevThe measuring and transtion and experimental control of parameters of torsional vi-Sergey Aboleshkin PhD mitting unit is attached to the free end of the engine crankshaft, brations on vessels in operation flywheel or damper
Resonances were observed at frequencies of 857 rpm (the amplitude of the tangential stress is 18 % of the allowable by the Russia Maritime Register od Shipping (RMRS) requirements); 1270 rpm
The proposed methodology has a number of advantages: – ability to continuously record in real time the signal in the entire range of measured rotation speeds of the crankshaft; – direct determination of torque and tangential stresses on the shaft; – allows to record the signal remotely

Summary

DESIGN OF DETECTOR OF INTERNAL

The appearance during the operation of a ship’s propulsion unit of torsional vibrations of ship shaft lines causes danger-. COMBUSTION ENGINE’S CRANKSHAFT TORSIONAL VIBRATIONS BASED ON ACCELEROMETER METHOD. Of measuring the instantaneous value of the angular acceleration of the shaft. The moment of inertia of ous dynamic loads in this unit, Oleksander Veretennik the mass and the moment of which can lead to damage to el-. Doctor of Engineering Sciences, Professor resistance are determined by ements of power plants that pro-. The measuring and transtion and experimental control of parameters of torsional vi-. Sergey Aboleshkin PhD mitting unit is attached to the free end of the engine crankshaft, brations on vessels in operation. It includes are determined by the rules of international classification societies [3,4,5,6]

Methods

Findings

ISO 3046-5: Reciprocating internal combustion engines-Performance – Part 5