Abstract
The diagnostic testing of internal combustion engine can be made by using working processes and methods which take advantage of leftover processes. Working processes give information about general condition of internal combustion engine. Leftover processes give information about condition of particular subassemblies and kinematic couples; hence they are used as autonomous processes or as processes supporting other diagnostic methods. Methods based on analysis of vibrations and noise changes to determine technical condition of object are named as vibroacoustic diagnostics. In papers about vibroacoustic diagnostics of engine, problems connected with difficulty to select test point and to define diagnostic parameters containing essential information about engine’s condition, are most often omitted. Selection of engine’s working parameters and conditions of taking measurements or recording vibration signal are usually based on references, researcher’s experience or intuition. General assumptions about taking measurements of signal closest to its source are most often used. This paper presents a new approach to vibroacoustic diagnostics of jet engine. Selection of measurement points of vibration signals on the basis of tests stand results was suggested and perform a sensitivity analysis of measurement points on the engine support.
Highlights
In the capacity of drive units in the aircraft among other things the jet engines of high power rating are used
The following values describe working processes used in diagnostic testing of combustion engines: power, torque, reaction torque, instantaneous angular speed and turning angle of crankshaft etc
The used software enabled to carry out an analysis of three signals at the same time. Such an analysis variant gave opportunity to determine the influence of the dynamical impacts in on the signals synchronously recorded in three different measurement points
Summary
In the capacity of drive units in the aircraft among other things the jet engines of high power rating are used. Diagnosing of their technical condition enables to carry out an overhaul policy conditioned by technical condition, to prevent most of unplanned outages and by detecting defects in early stage, to decrease significantly the scope and the cost of overhaul and service. To assess technical condition and working conditions (functional and operation parameters) of combustion engine, parameters and characteristics of vibration signal generated by combustion engine [1,2,3] are more and more often used. This study hereafter will show the problem of choosing on the engine support the point of acquisition of the vibration signals for diagnostic testing (for the aspect engine power assessing)
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