Propellant storage tank shaking damping device adapted to great change of temperature difference and internal pressure

Abstract

A propellant storage tank shaking damping device adapted to great change of temperature difference and internal pressure is applied to the interior of a propellant storage tank, adapts to changes of the temperature difference and the internal pressure, reduces liquid shaking energy, guarantees attitude control of a rocket in the flying process, and belongs to the field of structures. The damping device comprises a right-angle welding angle piece, a longitudinal connecting stringer and an annular anti-shaking plate with a reinforcing groove. One end of the welding corner piece is arranged on the tank wall of the storage tank in a spot welding mode, the other end of the welding corner piece is fixedly connected with the annular anti-shaking plate, the two layers of anti-shaking plates are connected through two longitudinal connecting stringers, and the connecting stringers and the anti-shaking plates are riveted. The structure can prevent fuel shaking from generating coupling response with a control system, changes the natural vibration frequency of the storage tank, inhibits shaking energy, and ensures that the anti-shaking structure keeps stable under the effect of low temperatureand fuel internal pressure.

Description

technical field [0001] The invention relates to a sloshing damping device for a propellant storage tank adapted to large changes in temperature difference and internal pressure, which is applied inside the propellant storage tank, adapts to changes in temperature difference and internal pressure, reduces liquid sloshing energy, and ensures the attitude control of a rocket during flight. belongs to the field of structure. Background technique [0002] The anti-sloshing structure is installed inside the liquid storage tank, which is a mechanical device used to suppress the sloshing motion of the liquid and change the sloshing frequency, so as to prevent the coupling phenomenon between the liquid sloshing frequency and the control frequency. The new-generation launch vehicle uses low-temperature propellant, and the diameter of the storage tank spans from 3.5m to 5m. Compared with the traditional anti-sway plate structure, in addition to the sway load, it also has to withstand g...

AI Technical Summary

Problems solved by technology

[0007] The above structures have achieved remarkable results in anti-shake measures, but facing the new generation of launch vehicles using low-temperature propellants, the thermal environment in the tank will drop by more than 200°C during filling, and the box structure will shrink and deform, and the axial deformation of the box can reach 90mm, radial unilateral shrinkage reaches 15mm; after pressurization, due to the different rigidity of the box, the deformation distribution is uneven, and there will be deformation inconsistencies at the connection between the anti-shake structure and the storage tank and the overlapping part of the sway structure, which will cause Unstable wrinkles on the anti-sway panel, or failure of solder joints and connecting structures

If the anti-sway structure fails, not only will the liquid slosh be unable to be suppressed, but the fallen solder joints and bolts will form redundant objects in the box, resulting in flight failure

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