By V. Shmyrov, et al.,
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Forced oscillations are performed under influence of the given shaking forces. The forced vibration frequency is equal to frequency of the shaking force (Fig. 1, b). a b Fig. 1. Free and Forced Oscillations The amplitude of oscillation sometimes reaches such value that it complicates a normal operation of instruments and gears and can cause breaking of structure elements. Vibrations reduce the service life and reliability of parts and equipment and frequently cause fatigue failures of a structure.
The moment MZ is jointly carried by forward (auxiliary) and rear fittings. The beam structure can be assembled or stamped. Beams 1 of assembled structure (Fig. 8, а) are made of aluminium alloys. They consist of caps 3, webs 2 and reinforcements 5. The reinforcements must be in places of trunnions 6. The stamped beams 1 (Fig. 8, b) can be made of a magnesium alloy. In truss-girder airframe (Fig. 8, b) in addition to the beam 1 there are rods 2. These rods should not prevent engine from thermal expansions.
Otherwise there will be a pressing-out of fuel through the vent system. It can cause a fire. It is also inadmissible because we lose fuel. 2. Saturated vapor pressure (steam tension) of fuel is the important characteristics of fuel. It determines their vaporability, impacts to the altitude performance of the fuel system. Pt — the greatest vapor pressure, being above fuel, which is reached at vaporation into a closed vessel at the specified temperature. Aviation fuels are multicomponent liquids.