Abstract
In the present study, the effect of vacuum annealing process on the damping properties of the softmag material which is used aerospace applications was observed. The softmag (mu-metal) material was used in aerospace applications due to its high permeability to shield sensitive electronic equipment against electromagnetic radiations. The equipment that are used in aerospace applications should withstand heavy vibrations which are generally experienced during the flight. Random vibrations are experienced due to the thrust forces from fuel combustion and the turbines impart sinusoidal vibrations. The vibration response of the softmag metal box was studied by imparting both sinusoidal and random vibration sweeps of frequency range 20–2000 Hz at three differentaccelerations for each type of vibration. The vibration response was also studied after vacuum annealing the box at the same vibration conditions. The vibration amplitudes and forces of vacuum annealed box were reduced compared to that of softmag box without vacuum annealing. The damping of the box was increased by around 6%. This improvement in damping will have a significant effect on the life of the electronic equipment mounting structures.
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