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Assessment of vibration isolation generated by the inertial forces of an aircraft combustion engine on a test bench

Szymański Grzegorz M., Waligórski Marek, Misztal Wojciech

Diagnostyka

2024

Vol. 25, No. 3

art. no. 2024301

The scientific issues that are the subject of this article are related to the assessment of the vibration damping efficiency of an aircraft engine installed on a test stand for the type of vibration isolator used. For this purpose, appropriate empirical tests were carried out on an aircraft internal combustion piston engine of the Rotax 912 type, under conditions of variable engine speed, for selected mounting locations of vibration transducers on the engine and its frame. The effectiveness of vibration isolation of vibrations generated by inertia forces was assessed, based on the proposed mathematical equations and the determination of the values of discrete impulse and energy measures describing them for accelerations, velocities and vibration displacements in various directions. Thanks to this, it became possible to perform a diagnostic assessment of the generation and propagation of vibrations and their isolation from the perspective of operational vibration loads on the object and its supporting structure, as well as in the context of the research reliability of the signal for a given type of damping of forces and moments of inertia.