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Vibration Diagnostics as an effective Tool for Testing Engines of Internal Combustion

Domotor F., Szabo J. Z.

Production Engineering Archives

2017

Vol. 16

3--6

There are several methods of automotive diagnostics used in services to detect a large variety of faults and damages of various parts of engines of internal combustion. Undoubtedly, they are effective, but they are simply unable to find all types of mechanical faults occurring during the operation. This is the reason why authors of this paper tried to use a special tool, which has been proven for years for detecting faults of rolling element bearing in rotating machinery. During their research, the authors tried to find valuable results by measuring vibration of various parts of engines. Three items were tested, a Diesel engine and two Otto motors. A large number of measurements have been taken at various speed, at different points, in different directions, with different parameter setup, etc. However, there was one setup which has been applied to all three engines. It is the measurement setup of vibration velocity, in the frequency range of 2 Hz-300 Hz. Valuable consequences have been found regarding the clogging of the air filters and the exhaust systems. As a conclusion the authors expressed their opinion, that, apart from the traditional diagnostic methods used in services, vibration measurements can also be useful, especially for detecting faults of rolling element bearings.

Vibration acceptance test of vehicle gearboxes used in agriculture

Domotor F., Banlaki P.

International Journal of Applied Mechanics and Engineering

2010

Vol. 15, no 2

491-496

In this paper, a new method for vibration acceptance test of gearboxes of an agricultural vehicle is described. The method is based on the well known, and most widely used, international standards. Due to economic and other reasons, the parameters of the elaborated method do not correspond in detail to all conditions of the standards. However, both the manufacturer and the customer agreed to accept this method, as the standards themselves permit some deviations, if both parties agree to it. Tests were carried out in the acceptance workshop of the manufacturer. For the measurement the vibration analyser of a world leader was used. For the evaluation the so called waterfall spectra were used.