CN-121993319-A - Method for reducing shake-shake coupling of universal core-level rocket core auxiliary storage tank

CN121993319ACN 121993319 ACN121993319 ACN 121993319ACN-121993319-A

Abstract

The invention provides a method for reducing shaking-shaking coupling of a general core-level rocket core auxiliary storage tank, which comprises the steps of establishing a liquid shaking damping characteristic calculation equation according to the structural characteristics of the rocket storage tank, calculating to obtain the change rule of the shaking damping of the rocket core-level and the auxiliary storage tank along with the change of the equivalent liquid height of the storage tank under the arrangement of a current rigid damping ring according to the liquid shaking damping characteristic calculation equation, and adjusting the position of the rigid damping ring of the auxiliary storage tank according to the obtained change rule of the shaking damping of the liquid of the core-level storage tank, thereby reducing the shaking-shaking coupling superposition strength between the core-level and the auxiliary storage tank. According to the invention, by changing the arrangement of the liquid rigid damping rings of different storage tanks, the shaking peak superposition caused by superposition of small damping areas among the damping rings is avoided, and the influence of liquid shaking coupling of the core-assisted storage tank on the rocket flight state can be greatly reduced, so that the subsequent gesture control system design and simulation are facilitated.

Inventors

MA GUORONG
ZHANG FEI
ZHAN KANGYI
YANG TENGYUE
HU CUNMING

Assignees

上海航天控制技术研究所

Dates

Publication Date: 20260508
Application Date: 20251222

Claims (10)

1. A method of reducing sloshing-sloshing coupling of a universal core stage rocket core auxiliary tank, comprising: According to the structural characteristics of the rocket storage tank, establishing a liquid shaking damping characteristic calculation equation; According to a liquid shaking damping characteristic calculation equation, calculating to obtain a change rule of the liquid shaking damping of the rocket core stage and the boosting stage storage tank along with the change of the equivalent liquid height of the storage tank under the current rigid damping ring arrangement; According to the obtained liquid shaking damping change rule of the core level storage tank, the position of a rigid damping ring of the liquid storage tank of the booster is adjusted, so that the shaking-shaking coupling superposition strength between the core level and the booster is reduced.
2. A method for reducing sloshing-sloshing coupling of a general core-stage rocket core auxiliary storage tank as set forth in claim 1, wherein the general core-stage rocket, the core-stage and the booster storage tank are both flat-bottom cylindrical storage tanks, and the structure is characterized in that the upper storage tank has no cylindrical pipe extending downwards from the center of the top of the storage tank to the bottom of the storage tank, concentric with the center of the top of the storage tank, the lower storage tank has concentric pipes, the storage tank body has no partition plate, the end has cross partition plates, and the side wall of the storage tank is provided with a plurality of layers of rigid sloshing-preventing damping rings as sloshing-preventing devices.
3. The method for reducing sloshing-sloshing coupling of the universal core-stage rocket core auxiliary tank of claim 1, wherein the liquid sloshing damping characteristic calculation equation is as follows: Wherein, the As a first and second class of bessel functions, Is a derivative thereof; An operation formula consisting of Bessel functions and derivatives thereof; The radius of the concentric pipeline in the storage tank is set; Is the radius of the storage tank; Is the height of the liquid in the storage tank; radius of concentric pipes in the tank Radius from the storage tank Ratio of; Determinant root composed of derivatives of two classes of Bessel functions; The circumferential separation parameter of the storage tank is set; numbering the storage tank separation areas; is the included angle between the first-order shaking vibration mode and the static liquid level Is the equivalent shaking mass transverse displacement; Is the width of the rigid damping ring; For the distance from the damping plate to the stationary liquid level, d is positive when the damping ring is under the liquid level; Is the liquid shaking amplitude; is a damping coefficient; damping the sloshing of the liquid in the storage tank.
4. A method of reducing tank sloshing-sloshing coupling for a generic-core rocket core auxiliary tank as defined in claim 3 wherein the tank circumferential separation parameter In particular when there is no separation When the "one" words are separated When "+" is separated And so on.
5. A method for reducing tank sloshing-sloshing coupling of a generic core rocket core auxiliary tank as defined in claim 3, wherein the two classes of the derivatives of Bessel functions form determinant roots The method specifically comprises the following steps: When (when) In the time-course of which the first and second contact surfaces, The method meets the following conditions: , When (when) I.e., without concentric tubing, The method meets the following conditions: 。
6. A method for reducing sloshing-sloshing coupling of a universal core-stage rocket core auxiliary tank as defined in claim 3, wherein the sloshing damping calculation formula is as follows Only at Is effective at time and When (when) When in use, vibration damping is obtained according to the above method Maximum value of (2) ; When (when) At the time, shake damping Calculating according to the smooth wall surface; When (when) At the time, shake damping At the position of Internal pressing Linear interpolation of the value range.
7. A method of reducing sloshing-sloshing coupling of a common core stage rocket core auxiliary tank as defined in claim 3 wherein the liquid sloshing amplitude An equivalent sloshing mass lateral displacement at n=1 can be used Instead of.
8. A method of reducing sloshing-sloshing coupling of a common core stage rocket core auxiliary tank as defined in claim 3 wherein the damping coefficient In connection with the selection of the damping means, when the damping means is a rigid damping ring, When the damping device is a damping bulkhead, 。
9. A method for reducing sloshing-sloshing coupling of a general core-stage rocket core auxiliary storage tank according to claim 3 is characterized in that the calculation of the change rule of the liquid sloshing damping of the rocket core and the auxiliary storage tank along with the change of the equivalent liquid height of the storage tank under the arrangement of the current sloshing damping rings comprises the steps of calculating the liquid sloshing damping of each storage tank of the rocket core from the take-off moment to the auxiliary separation moment according to the liquid sloshing damping characteristic calculation equation established above and the arrangement condition of the sloshing damping rings in the storage tanks of the core and the auxiliary storage tank, and further obtaining the liquid damping of the core-stage rocket core With the change of the liquid level h The distribution rule between them.
10. A method for reducing sloshing-sloshing coupling of a universal core rocket core auxiliary tank according to claim 3, wherein adjusting the arrangement of a rigid damping ring of the booster liquid tank according to the obtained liquid sloshing damping change rule of the core tank comprises the following steps: According to the obtained liquid shaking damping change rule of the core storage tank, the distribution of shaking-preventing partition plates of the rocket boosting storage tank is adjusted, and the rocket boosting storage tank is changed under the condition that the core storage tank is at the same liquid level height The value is changed, so that the liquid shaking damping distribution of the boosting-stage storage tank is changed, the liquid shaking damping dislocation distribution of the boosting-stage storage tank and the core-stage storage tank is realized, and when the liquid shaking damping of the core-stage storage tank is the calculated minimum value, the liquid shaking damping of the boosting-stage storage tank is the calculated maximum value When the same-frequency resonance of the arrow body core auxiliary storage box is realized, the core-level shaking small damping area is overlapped with the boosting-level shaking large damping area, so that the shaking-shaking coupling superposition strength of the arrow body core is reduced.

Description

Method for reducing shake-shake coupling of universal core-level rocket core auxiliary storage tank Technical Field The invention relates to a method for reducing shake-shake coupling of a storage assisting tank of a general core-level rocket core, belonging to the field of carrier rocket control. Background The rocket with the universal core stage binding configuration realizes the aims of increasing the rocket scale and improving the carrying capacity on the basis of not increasing the diameter of the rocket body by binding a plurality of basically same core stages in parallel. The design concepts of modularization, combination and serialization are fully utilized, so that the development cost is reduced, and the development progress is quickened. However, the core stage and the boosting stage are basically the same, so that the rocket core stage and the boosting stage liquid propellant can face the same-frequency shaking problem in the flying process. Under the same storage tank configuration, the shaking frequency characteristic of the liquid propellant in the rocket storage tank is mainly related to the liquid level, so that the shaking frequency of the rocket core auxiliary storage tank is similar under the condition of being close to the liquid level in the flying process, and the phenomenon of homodromous shaking-shaking coupling superposition can occur. Liquid shaking can be regarded as a second-order spring oscillator model, and the damping coefficient of the second-order spring oscillator modelThe amplitude of shaking under the same excitation is determined, and the smaller the damping coefficient is, the more intense the vibration is. To restrain liquid sloshing, a plurality of layers of anti-sloshing damping plates/rings are usually added in the storage tank, which can damp the liquid sloshing in the storage tankA periodic variation occurs with the liquid level. Therefore, the shaking-shaking coupling superposition strength of the core auxiliary storage tank can be reduced by adjusting the distribution of the damping coefficients of the liquid in the storage tanks of the boosting stage and the core stage. Disclosure of Invention The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a method for reducing the shake-shake coupling of a general core-level rocket core auxiliary storage tank. The technical scheme of the invention is that the method for reducing the shake-shake coupling of the universal core-level rocket core auxiliary storage tank comprises the following steps: According to the structural characteristics of the rocket storage tank, establishing a liquid shaking damping characteristic calculation equation; According to a liquid shaking damping characteristic calculation equation, calculating to obtain a change rule of the liquid shaking damping of the rocket core stage and the boosting stage storage tank along with the change of the equivalent liquid height of the storage tank under the current rigid damping ring arrangement; According to the obtained liquid shaking damping change rule of the core level storage tank, the position of a rigid damping ring of the liquid storage tank of the booster is adjusted, so that the shaking-shaking coupling superposition strength between the core level and the booster is reduced. The general core rocket is structurally characterized in that an upper-stage storage tank is not provided with a cylindrical pipeline which extends downwards from the center of the top of the storage tank to the bottom of the storage tank and is concentric with the center of the top of the storage tank, a lower-stage storage tank is provided with a concentric pipeline, a storage tank main body is not provided with a partition plate, the tail end of the storage tank is provided with a cross partition plate, and the side wall of the storage tank is provided with a plurality of layers of rigid anti-shaking damping rings serving as anti-shaking devices. The liquid shaking damping characteristic calculation equation is specifically as follows: Wherein, the As a first and second class of bessel functions,Is a derivative thereof; An operation formula consisting of Bessel functions and derivatives thereof; The radius of the concentric pipeline in the storage tank is set; Is the radius of the storage tank; Is the height of the liquid in the storage tank; radius of concentric pipes in the tank Radius from the storage tankRatio of; Determinant root composed of derivatives of two classes of Bessel functions; The circumferential separation parameter of the storage tank is set; numbering the storage tank separation areas; is the included angle between the first-order shaking vibration mode and the static liquid level Is the equivalent shaking mass transverse displacement; Is the width of the rigid damping ring; For the distance from the damping plate to the stationary liquid level, d is positive when the damping ring is under the li