By V. Shmyrov, et al.,
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Additional info for Airplane Power Plants Systems Designing (synopsis)
It occurs in turboprop engine mounts). 3. The case, that the frequency of forced oscillation is bigger than the frequency of natural one (the third zone), is desirable. As the amplitude of forced oscillations is less than the static values of movements. 4. Even at presence of drag (damping), the forced oscillations happen with a frequency of shaking force. 5. The amplitude of the forced oscillations does not depend on entry conditions and time. I. е. the forced oscillations are not damped. 6. At a resonance ( ω = p ) the amplitude of the forced oscillations q remains finite AF = .
When designing the engine mounts, it is necessary to provide access to units of the engine (and to the equipment installed on it) for maintenance. It is also required to provide a fast engine replacement. Requirements to engine mounts are the following. 1. Carry all loadings from engine with the units and the equipment installed on it under any allowable operation conditions. Thus casing of the engine must not include in airframe of aircraft. 2. Provide specified strength and stiffness at minimal mass.
Engine Mounts of Turbojet with Centrifugal Compressor inside Fuselage Fig. 12. Design of Attachment of Rods 4, 4’ (Fig. 11) Fig. 13. Design of Nodes A (Fig. 11) In Fig. 14 the engine mounts of turbojet with the axial-flow compressor is shown. Here the engine is attached at two supporting locations to load–carrying frames. The node A carries thrust and is loaded in addition by side loads. The rod 5 takes part in carrying side loads. The load–carrying element A represents a pin, Fig. 15. When mounting the engine, the lower part of this pin enters into the spherical bearing installed on the engine.
Airplane Power Plants Systems Designing (synopsis) by V. Shmyrov, et al.,