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职明洋, 燕国军, 孙龙泉, 王鹏霄. 带气囊结构航行体入水回收动力学特性研究. 力学学报, 2024, 56(4): 1-17. DOI: 10.6052/0459-1879-23-451
引用本文: 职明洋, 燕国军, 孙龙泉, 王鹏霄. 带气囊结构航行体入水回收动力学特性研究. 力学学报, 2024, 56(4): 1-17. DOI: 10.6052/0459-1879-23-451
Zhi Mingyang, Yan Guojun, Sun Longquan, Wang Pengxiao. Investigation of dynamic characteristics about vehicle with airbags structure during water-entry and recovery. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(4): 1-17. DOI: 10.6052/0459-1879-23-451
Citation: Zhi Mingyang, Yan Guojun, Sun Longquan, Wang Pengxiao. Investigation of dynamic characteristics about vehicle with airbags structure during water-entry and recovery. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(4): 1-17. DOI: 10.6052/0459-1879-23-451

带气囊结构航行体入水回收动力学特性研究

INVESTIGATION OF DYNAMIC CHARACTERISTICS ABOUT VEHICLE WITH AIRBAGS STRUCTURE DURING WATER-ENTRY AND RECOVERY

  • 摘要: 针对大尺度模型入水航行体的回收问题, 为避免结构入水下落产生的过大入水深度对发射平台的安全造成威胁, 并提升模型航行体的回收效率. 文章设计了一种带气囊的航行体结构, 认为气囊自空中释放并与航行体同步入水, 经上浮后确保结构回收, 并给出了模型具体的设计参数. 同时基于耦合欧拉-拉格朗日(CEL)算法建立了带气囊结构入水回收的数值计算模型, 结合相关球体入水以及AUV头段入水试验结果, 验证了数值方法的有效性并选取了本模型的无关性网格尺度. 在此基础上, 开展了不同气囊体积下航行体垂直入水回收的计算, 选取了该结构对应的最佳气囊体积. 随后, 针对不同入水参数(入水速度、攻角以及气囊固定位置)进行了带气囊结构航行体入水回收过程的对比分析. 研究结果表明, 气囊体积对回收效率的提升具有正相关作用, 且在体积的选取中应兼顾回收效率与气囊内压响应; 入水速度的增加诱导系统运动规模同步增加, 不利于回收的进行; 入水攻角以及气囊固定位置的不同造成不同阶段航行体偏转运动的差异, 气囊固定在航行体中部且较大的入水攻角有利于航行体模型的入水回收.

     

    Abstract: Aiming at the problem in the recovery of large-scale model vehicle that the excessive depth during the water-entry process may affect the safety of the launch platform, the vehicle with airbag structure is designed in this paper to improve the recovery efficiency of the whole process, which is considered to be released from the air before water-entry and float synchronously with the vehicle to ensure the recovery of the structure. And the specific design parameters of the model are also shown in this paper. At the same time, the numerical calculation model of the airbag structure during water-entry and recovery process is established based on the CEL algorithm. Combined with the experimental results of the sphere and the AUV head section during water-entry, the validity of the numerical method was verified and the irrelevant mesh scale was also selected. On this basis, the calculation of vehicle recovery during vertical water entry with different airbag volumes was carried out to select the optimum volume. Subsequently, a series comparative analysis of the recovery process over the structure was carried out for different water-entry parameters (the entry velocity, angle of attack and the fixed position of the airbags). The results show that the volume of the airbag has a positive correlation with the recovery efficiency, and that the volume should be selected taking into account the recovery efficiency and the pressure response. The increase in water-entry velocity causes a simultaneous increase in the magnitude of system motion, which is detrimental to recovery. The different angles of attack or airbag fixed position during the water-entry cause the difference in the deflection motion (attitude evolution) between different stages of the vehicle recovery process, and the water-entry with larger angle of attack and fixed position at the middle is beneficial to the recovery of the model.

     

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