充液椭球形Cassini贮箱刚-液耦合晃动特性试验研究

针对火箭发生刚-液耦合晃动现象时,箭体产生的横向偏移和姿态偏转难以在地面有效模拟的问题,设计并提出了一种基于六自由度平台的地面刚-液耦合晃动实验装置及方法,介绍了该装置的基本结构系统、刚-液耦合晃动实现方法及流程。在不同激励频率和多组充液高度下,对无挡板贮箱的刚-液耦合晃动位移进行了试验研究,发现激励频率与刚-液耦合晃动位移之间满足三次多项式函数关系。此外,从液体晃动的被动控制角度出发,在相同工况下对比探究了薄膜浮板与环形挡板对液体晃动的抑制效果,并对两种挡板结构下的晃动位移差异进行了解释分析。实验发现：薄膜浮板在不同充液高度下的“频率-位移”曲线趋势基本一致;而环形挡板与初始液位高度水平时,其对液面晃动的抑制效果最明显。

Experimental Study on Rigid-Liquid Coupled Sloshing Characteristics of Liquid-Filled Ellipsoidal Cassini Tank

Aiming at the problem that it is difficult to effectively simulate the lateral offset and attitude deflection of the rocket body on the ground when the rigid-liquid coupled sloshing phenomenon occurs in the rocket, a ground rigid-liquid coupled sloshing experimental device and method based on six degrees of freedom platform are designed and proposed, and the basic structure system of the device, the realization method and process of rigid-liquid coupled sloshing are introduced. Under different excitation frequencies and multiple groups of liquid-filling heights, the rigid-liquid coupled sloshing displacement of the tank without baffle is experimentally studied, and it is found that the relationship between the excitation frequency and the rigid-liquid coupled sloshing displacement satisfies a cubic polynomial function. In addition, from the perspective of passive control of liquid sloshing, the suppression effects of membrane floating plate and annular baffle on liquid sloshing are compared and explored under the same working conditions, and the difference of sloshing displacement between the two baffle structures was explained and analyzed. The experimental results show that the "frequency-displacement" curve trend of membrane floating plate are basically the same under different liquid filling heights; When the annular baffle is at the same level as the initial liquid level, its effect on liquid level sloshing is most obvious.