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王野 , 陈慧岩 , 汪泰霖 , 等 . 矢量喷水推进两栖车航行姿态的数值及试验分析 [J ] . 兵工学报 , 2022 , 43 ( 12 ): 3172 - 3185 .

WANG Y , CHEN H Y , WANG T L , et al. Numerical and experimental analysis on the navigation attitude of vector waterjet propelled amphibian vehicles [J ] . Acta Armamentarii , 2022 , 43 ( 12 ): 3172 - 3185 . (in Chinese) DOI: 10.12382/bgxb.2021.0872 http://doi.org/10.12382/bgxb.2021.0872 To improve the navigational stability of high-speed amphibious vehicles and reduce the pitch of the amphibious vehicle when encountering waves, a single vector water jet thruster system that can keep heading and adjust attitude is designed and applied to a model amphibious vehicle, as opposed to a multi-thruster configuration. Based on the Moving Reference Frame method for rotational basins, the RNG k-ε model is used to calculate the output thrust of the vectored waterjet thruster. Combined with the thrust results from the CFD calculations, joint vortex simulations are used to calculate the sailing characteristics of the amphibious vehicle fitted with vector water jet thrusters. The free-running heading-keeping experiment and forced-running pitch-reduction experiment are carried out on the towing pool model vehicle to verify the functions of the thruster. The simulation and experiment results show that the thruster can, to a certain extent, reduce the amphibious vehicle's pitch amplitude when encountering longitudinal waves during navigation, and the standard deviation of the vehicle's pitch is reduced by 38% and 23%, respectively, in the two pitch-reduction experiments. The vector water jet thruster also allows the amphibious vehicle to maintain a stable heading during navigation, and the lateral displacement of the vehicle is less than 0.6 m in the heading-keeping experiment.

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ZHOU G L , OU Y P . Study on the numerical prediction method of calculating the sailing state and resistance for medium & high speed ship [J ] . Journal of Wuhan University of Technology(Transportation Science & Engineering) , 2016 , 40 ( 4 ): 637 - 640 ,645. (in Chinese)

陈泰然 , 耿昊 , 王典 , 等 . 水陆两栖车辆水上运动特性实时仿真系统研究 [J ] . 兵工学报 , 2024 , 45 ( 5 ): 1402 - 1415 . DOI: 10.12382/bgxb.2022.1237 http://doi.org/10.12382/bgxb.2022.1237 为解决水陆两栖车辆水动力性能参数获取难度大、运动姿态预测慢等问题,设计一种两栖车辆水上运动特性实时仿真系统,实现仿真模型的驱动、运动姿态预测以及数据的监测和输出,通过动态流体-物体相互作用数值计算方法对车体动力学系数进行修正,提升了实时仿真系统的精度。在此基础上研制试验样车,对不同工况下实时仿真系统的准确性进行验证。试验结果表明:所构建的两栖车辆水上运动特性实时仿真系统兼具计算精度和计算效率,可以快速准确地预测车辆的运动姿态,适用于多种复杂工况,具有姿态预测的泛用性。新系统在两栖车辆研制阶段、驾驶员培训、半实物仿真演练、复杂环境模拟等方面具有较强的应用价值和应用前景。

CHEN T R , GENG H , WANG D , et al. Research on the real-time simulation system for hydrodynamic characteristics of amphibious vehicle [J ] . Acta Armamentarii , 2024 , 45 ( 5 ): 1402 - 1415 . (in Chinese) DOI: 10.12382/bgxb.2022.1237 http://doi.org/10.12382/bgxb.2022.1237 A real-time simulation system for the hydrodynamic characteristics of amphibious vehicles is designed to solve the problems of dificultly acquiring the hydrodynamic parameters and slowly predicting the motion attitude of amphibious vehicles. It can realize the driving of simulation models, motion attitude prediction, data monitoring and output. The numerical calculation method(CFD) is used to correct the vehicle dynamics coefficients, which significantly improves the accuracy of real-time simulation system. In addition, a test amphibious vehicle is developed to verify the accuracy of real-time simulation system under different working conditions. The results show that the real-time simulation system can be used to accurately and efficiently simulate the hydrodynamic characteristics of amphibious vehicles, and predict the motion attitude of the vehicle quickly and accurately. It is also applicable to various complex working conditions and has universal applicability for attitude prediction. The system has strong application value and application prospect in the development stage of amphibious vehicles, driver training, semi-physical simulation exercises and complex environment simulation.

赵彬 , 张敏弟 , 剧冬梅 . 基于动网格的两栖车辆航行姿态数值模拟 [J ] . 兵工学报 , 2015 , 36 ( 3 ): 412 - 420 . DOI: 10.3969/j.issn.1000-1093.2015.03.005 http://doi.org/10.3969/j.issn.1000-1093.2015.03.005 针对两栖车水上航行姿态，构建描述两栖车水上运动的动力学模型，采用混合耦合算法和动网格技术研究静水直航状态下，两栖车航行姿态的变化规律，模拟结果与实验值吻合较好。研究结果表明：车体达到稳定航行姿态会经历大幅振荡调整阶段和平稳运动阶段，车体平衡后，升沉和纵倾仍会有小幅变化；两栖车由排水航行状态逐步增速到滑行状态的过程中，车体重心逐渐升高，动升力在支撑车重成分中所占的比例越来越大，静浮力则越来越小。

ZHAO B , ZHANG M D , JU D M . Numerical simulation of navigating pose for amphibious vehicle based on dynamic-mesh model [J ] . Acta Armamentarii , 2015 , 36 ( 3 ): 412 - 420 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2015.03.005 http://doi.org/10.3969/j.issn.1000-1093.2015.03.005 A dynamics model for the navigating pose of amphibious vehicle in water is established. The dynamic mesh technology and the hybrid coupled algorithm are used to study the change rule of navigating pose of amphibious vehicle in sailing, and the navigating pose of amphibious vehicles in still water are discussed. The numerical results are consistent with the experimental results. The result shows that the vehicle undergoes a sharp motion and a smooth motion during movement before achieving the ultimate navigating pose. After achieving the ultimate navigating pose, the center-of-gravity and the pitch angle slightly change. During the process of sailing from drainage state to coasting state, the body center of gravity gradually increases; the dynamic buoyancy to support the vehicle weight increases, and the static buoyancy decreases.

周利兰 , 张乐乐 . 两栖车辆航行阻力特性的数值研究 [J ] . 华南理工大学学报(自然科学版) , 2021 , 49 ( 12 ): 133 - 142 . DOI: 10.12141/j.issn.1000-565X.200719 http://doi.org/10.12141/j.issn.1000-565X.200719 针对高速两栖车水上航行阻力特性问题，采用基于雷诺平均方程的有限体积法对静水中高速两栖车的阻力及航态进行了数值模拟。通过不同网格密度的阻力比较，对网格收敛性进行了讨论；通过与模型试验结果的对比，对文中采用的数值计算方法进行了验证。另外，结合叠模计算结果对两栖车的各阻力成分进行了分析。在此基础上，计算分析了带开口的两栖车模型的阻力及航态变化。结果表明：处于过渡阶段的两栖车，其兴波阻力占总阻力的比例随航速增加而增加（最高可达到60%以上），黏压阻力占比30%~40%，摩擦阻力占比小于10%；增加开口后两栖车的阻力增加，在Fr▽=1.297时阻力增大约11%，车体下沉深度增大约5%；与无开口状态相比，有开口两栖车的各个阻力成分的占比发生变化，兴波阻力占比减少，而黏压阻力占比增加。

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DENG H , WANG E L , YI W B , et al. Numerical models for calculating ship hydrodynamic pressure field in restricted waters with significant blocking effect [J ] . Acta Armamentarii , 2022 , 43 ( 3 ): 605 - 616 . (in Chinese) DOI: 10.12382/bgxb.2021.0106 http://doi.org/10.12382/bgxb.2021.0106 Pressure mine works on the signal from ship hydrodynamic pressure field，which is more dangerous in shallow and offshore waters and so on. For obtaining the signals from ship hydrodynamic pressure fields in different restricted waters，a CFD numerical model is proposed based on the viscous theory，and the hydrodynamic characteristics, such as sinkage，trim，wave making and resistance, are calculated and validated. And a finite difference numerical model is established based on the potential flow theory，and the ship hydrodynamic pressure fields calculated by the two numerical models are compared. It is found that the two numerical models are different，but their calculated results are consistent，and they are both suitable for restricted waters with significant blocking effect or mixed flow.The results show that the more obvious the blocking effect is，the higher the grid division quality is，with giving small time step and setting denser grids near the water bottom and shore boundaries. If the blocking effect is more obvious，the restricted water has more significant effect on the hydrodynamic pressure field，and its negative pressure peak changes greatly，which may lead to the unreasonable design of mine fuze parameters，and miss the best detonation time.

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ZHANG F Y , LU H , CHEN T R , et al. Transient characteristics of start-up process of an axial flow water-jet propeller [J ] . Acta Armamentarii , 2021 , 42 ( 8 ): 1592 - 1603 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2021.08.003 http://doi.org/10.3969/j.issn.1000-1093.2021.08.003 The propulsion performance of an axial flow water-jet propeller during start-up process is improved to study its transient characteristics and self-priming performance. The SST k-ω turbulence model, Zwart cavitation model and Free Surface model are used to study the start-up process of the proposed axial flow water-jet propeller under the framework of Reynolds-averaged Navier-Stokes equation. The effects of start-up time and waterline height on the transient characteristics of water-jet propeller were analyzed. The steady-state numerical method was verified based on the experimental data of water-jet pump, which is in good agreement with the numerical results. The results indicate that the start-up process show significant transient characteristics. The flow rate and the head reach the stable state later than the rotation speed, and the lag becomes more severe as the start-up time decreases. Cavitation occurs on the suction surface around the leading edge of the blade when the rotation speed is 0.6 times higher than the designed rotation speed. The dimensionless cavity area increases with the increase in the rotation speed. At the same rotation speed, the dimensionless cavity aera is negatively correlated with the start-up time, while the working capacity of the blade is positively correlated with the start-up time. When the waterline height is greater than or equal to 0.15 times larger than the impeller diameter with the center line of the pump shaft as zero reference line, the gas inside the water-jet propeller can be completely discharged in a short time, and the lag of flow rate and head becomes more severe as the waterline height decreases.

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