The numerical simulation of the heterostructures behaviour from dielectric materials and superhard at launch in space

摘要

During the space missions, the resistance structure of the launch vehicle as well as the transported space objects, dynamic loads are produced which have as their source the operation of the thrusters, the shocks generated by the switching moments of the regime and the vibrations. The intensity of dynamic stresses is appreciated through the magnitude of the accelerations. The accelerations of the structural elements occur in the launch phase of the space object. Mechanical shocks are short-term actions with rapid installation, accompanied by high-frequency vibrations and high amplitudes. In the paper, the heterostructure subjected to the analysis has the rectangular plate shape on which conductive layers and protective layers are deposited. On the modelled heterostructure with finite elements were analysed the behaviour in the shock regime, the spectral response and the dynamic response to the harmonic excitation in the base with acceleration intensity of 20 g. The objective of the numerical simulations followed the conditions of strength and rigidity and the optimization of the fastening mode of the heterostructure dynamically loaded. The guarantee of the accuracy of the numerically simulated solutions is supported in the paper with a convergence test. The results obtained during the work are very useful in the conceiving and design phase of the antennas with low PIM from dielectric and super hard materials under the conditions of the mechanical loading regime during launching in space.