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 internal combustion engine. Selection of test points of vibration on the basis of impact tests results was suggested and performed a sensitivity analysis of measurement points on the cylinder head, the force impulse.
Highlights
In the capacity of drive units in the rail vehicles among other things the self-ignition internal combustion engines
This study hereafter will show the problem of choosing on the engine head the point of acquisition of the vibration signals for diagnostic testing
This paper shows a method which supports the choosing of the vibration signals acquisition points, it is based on an analysis of the test signals
Summary
In the capacity of drive units in the rail vehicles among other things the self-ignition internal combustion engines C. engines) of medium and 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. Safety of transportation and their timelines constitute a separate issue. 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 – 3] are more and more often used. Receiving from vibrations diagnostically useful information is not easy.
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