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Title: Use of the Wavelet Transform for the Analysis of Irregularity of Crankshaft Angular Velocity
Authors: Bodnar, Borys Ye.
Ochkasov, Oleksandr B.
Chernyayev, Dmytro V.
Skvireckas, R.
Keywords: angular velocity irregularity
non-separable diesel diagnosis
digital signal filtering
spectral analysis
phase shift
Issue Date: 2018
Publisher: Kaunas University of Technology; Publishing House “Technologija“, Kaunas, Lithuania
Citation: Use of the Wavelet Transform for the Analysis of Irregularity of Crankshaft Angular Velocity / B. Bodnar, O. Ochkasov, D. Chernyaev, R. Skvireckas // Transport Means 2018 : Proc. of the 22nd Intern. Sci. Conf. (Oct. 03–05, 2018, Trakai, Lithuania) / Kaunas Univ. of Technology, Klaipėda Univ., JSC Lithuanian Railways (AB “Lietuvos Geležinkeliai”) [et al.]. – Kaunas, 2018. – Pt. II. – P. 962–967. A fragment of the text.
Abstract: EN: The issue of quick and qualitative receiving of reliable and complete information concerning the technical state of a diesel engine in the locomotive is relevant one, although there are already many technical solutions in this direction. Indirect methods for diesel engine diagnostics are of gain ground. Among the existing methods, the diagnostics of the diesel engine technical state occupies a special place due to the analysis of irregularity of crankshaft angular velocity. Within the working cycle of the diesel engine, the crankshaft angular velocity of rotation is constantly changed. The mechanical inertia system of the pistons, rods and shaft receives impulses of mechanical energy from fuel combustion, as well as pulsed losses of kinetic energy on pump pistons-stroke. Thus, the value and shape of the torque of each cylinder affects the angular velocity of the shaft. The purpose of the research is to study the various types’ application for basic functions of wavelet transform to emphasize the diagnostic information from the signal of angular velocity irregularity of the diesel engine shaft. This will automate the process of diagnosing the diesel engine. The authors conducted simulation of the working process of a shunting diesel locomotive with hydrodynamic transmission. Type of the diesel engine: six-cylinder in-line engine with turbo-charger, power 750 hp. The nominal modes of the diesel engine operation at the crankshaft speed of 1400 rpm were considered. There are simulation of the fault-free condition and two types of faults: the change of fuel injection advance angle and change of the cycle fuel injection to greater and smaller sides from the passport date. For the resulting angular-velocity vectors and acceleration we applied continuous wavelet transform with different basic functions. The obtained results are estimated by energy criteria. The most promising basic functions are separated from the point of view of the most complete estimation of the energy for the portion of the signal carrying diagnostic information.
Description: B. Bodnar: ORCID 0000-0002-3591-4772; O. Ochkasov: ORCID 0000-0002-7719-7214
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