Abstract:When conducting stability analysis to the longitudinal vibration of liquid rocket and establishing the vibration model of liquid inside of the tank, we need to consider the elastic characteristic of structure, as well as the damping character of liquid shaking. Due to the fact that the modal damping ratio is correlated to the work of damping force per vibration period, mean mechanical energy, and the modal nature frequency, we can first get the modal via analyzing the coupled vibrations of structure and liquid, and then calculate the work of the contact surface between liquid and structure, free surface and inner damping force, as well as mechanical energy, so as to achieve the modal damping ratio. The heat flux analogy method, which is adapted in the modal analyze of coupled vibration and the calculation of liquid inner fluid area, enables us to take full advantage of general program in calculation, which not only improves efficiency, but facilitates engineering application as well.
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