Pressure-storage frequency-varying device

Abstract

The invention discloses a pressure-storage frequency-varying device which is realized by virtue of the following technical scheme: the upper side of an annular base (10) is provided with a pneumatic cylinder (2) sealed by virtue of a chassis (4); the pneumatic cylinder is capable of pushing a valve shaft (15) fixedly connected with the center of an upper end cover out of a central hole of a flange plate of the pneumatic cylinder by virtue of the upper end cover (1) connected to the pneumatic cylinder; a corrugated pipe assembly (3) is capable of converting external pressure changes into telescopic motion of the upper end cover; the upper end cover compresses the corrugated pipe assembly under the effect of the external pressure changes, the corrugated pipe assembly stretches to push the upper end cover so as to open a valve; fixed frequency generated by volume of an inner cavity of the pneumatic cylinder and the vibration frequency of a transfusion pipeline of a propelling system are changed by virtue of external pressure, so that the generated longitudinal vibration frequency is isolated from the structure frequency, and generation of longitudinal vibration coupling of the propelling system is prevented. The pressure-storage frequency-varying device has the advantage that the strength, flexibility and use temperature range of the corrugated pipe assembly are improved.

Description

technical field [0001] The invention relates to a pressure accumulating frequency conversion device which reduces the vibration frequency of a propulsion delivery system of a rocket booster and can 'suck' the resonance of the liquid in the booster. Background technique [0002] With the continuous development of launch vehicle technology, the launch power of the rocket is also increasing, resulting in lower and lower longitudinal and local vibration frequencies and lateral frequencies of the rocket structure. Due to the interaction between the aircraft structure system and the propulsion system, the liquid rocket produces unstable longitudinal vibration-its shape is similar to "walking on stilts", so it is named POGO vibration. The stability of the propulsion system is related to the critical damping ratio. When the critical damping ratio is greater than the structural damping ratio, POGO vibration occurs. POGO vibration is an unstable self-excited vibration caused by the i...

AI Technical Summary

Problems solved by technology

Due to the small volume of the accumulator shell, the vaporization of the low-temperature medium in the shell is relatively large during the vibration test of the low-temperature accumulator, which makes it difficult to control the shell pressure

The valve shaft of the upper end cover of the pressure accumulator is easy to break during use

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