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One of the characteristic features of piston engines are vibrations caused by the pistons
moving in the cylinders. During the engine design process, it is necessary to determine the level
of vibration that can occur in the engine. This is especially important for aircraft engines. Due to
the minimization of the weight of the aircraft, it is necessary to limit the factors that may cause
damage to the structure. One of these factors is engine vibration, which can cause resonance and,
consequently, a dangerous stress concentration. Long-term action of variable loads may also lead
to the formation of fatigue cracks. The article presents the results of a multibody analysis of an
opposed-piston diesel engine. It is a two-stroke three-cylinder aircraft engine. The engine has
two crankshafts and six pistons that run opposite each other, but the rotation of the shafts is
shifted in phase 14°. Engine vibration will also be caused by crankshafts which, to reduce weight,
are not equipped with counterweights. The calculation results are presented in the form of time
courses of forces and displacements on the engine supports and FFT analysis of the vibration
velocity. The results show that the maximum vibration velocity is 7 mm/s and occurs at a
frequency of 140 Hz, which corresponds to twice the rotational speed of the crankshafts. The
results obtained from the tests allow for the selection of the flexible elements used in the real
prototype engine supports.
