Abstract
In this paper, a study of the vibrations that appear in the transmission shafts of an adder gearbox used for a heavy truck is made. The truck has two engines on only one chassis and the power offered by these engines is summated and transmitted to the truck or the working machine. This type of transmission is used for oil production installation for the army. During the transportation of the installation to the workplace, only one engine is running, after mounting installation, both engines are running. This paper studies the vibrations of the adder gearbox, a complex construction, subjected to multiple operating requirements. In this regard, the authors first performed accuracy (accuracy) tests of the VIC 3D system on an original experimental mini-stand. Measurements performed on a mini disc demonstrated the validity and accuracy of the method, even if the cameras used were not high resolution. The authors applied the same principle in the case of the adder box from the truck, obtaining useful results for those in the field. The experimental method uses the facilities of a contactless optical measurement method (VIC-3D), which provides a high-accuracy quantitative linear and angular vibration analysis. The VIC measurement method offers, based on a frontal viewing of the disk during the resonance phenomenon and by simple calculus on the monitored linear displacements, the corresponding angular amplitude.
Highlights
Oil drilling rigs are complex assemblies intended mainly for the controlled penetration of the terrestrial layers under which the hydrocarbon reserves are accumulated
In this paper, a study of the vibrations that appear in the transmission shafts of an adder gearbox used for a heavy truck is made
This paper studies the vibrations of the adder gearbox, a complex construction, subjected to multiple operating requirements
Summary
Oil drilling rigs are complex assemblies intended mainly for the controlled penetration of the terrestrial layers under which the hydrocarbon reserves are accumulated. When the obtained/generated frequencies during the working process become equal with the crankshaft’s eigenfrequencies, the resonance phenomenon will appear, which are very dangerous due to their unexpected high amplitudes In this case, the total angular displacements Φ of the crankshaft showed such non-acceptable amplitudes. The vibrations are associated with very dangerous fatigue solicitations which are, in the present case, some constant-sign types (between Mt,min and Mt,max, having the same sign) Taking into consideration both of the above-mentioned effects it can be concluded that a high-accuracy theoretical analysis (usually including a Finite Element Method (FEM) simulation) carried out by an experimental investigation represents a great challenge for the engine designers. The system is able to substitute a high-performance stroboscope and to quantitatively evaluate the vibration amplitudes In this respect, the authors designed and tested an angular vibration system. In the authors’ opinion, the VIC-3D could be used as a powerful, relatively cheap, simple, and high-accuracy investigation tool in the analysis of the torsional vibrations in combustion engines [23,24,25]
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