共查询到18条相似文献,搜索用时 356 毫秒
1.
2.
3.
4.
5.
水下滑翔机以其低功耗、低成本和低噪声等优势在海洋科研、环境监测、资源探测和军事侦察等领域具有广阔的应用前景,水下滑翔机主要用于海洋环境长时间、大范围的实时监测,因此要求其具有优良的水动力性能。文章利用Javafoil程序总结了水下滑翔机水平固定平板翼升阻比与翼型参数之间的特征关系,并基于该关系在综合考虑升阻比和俯仰力矩两方面因素后确定了水下滑翔机水平固定平板翼的参数。此外为改善水下滑翔机稳定性,分析和设计了柔性机翼,对水下滑翔机水平固定翼的设计具有一定指导和借鉴意义。 相似文献
6.
7.
水下滑翔机以其低功耗、低成本和低噪声等优势在海洋科研、环境监测、资源探测和军事侦察等领域具有广阔的应用前景,由于水下滑翔机长时间、大范围在水下作业,受海洋波浪影响严重,因此要求其具有优良的抗干扰能力.本文首先对水下滑翔机俯仰回路多阶水动力模型进行Pade'降阶,随后针对降阶后的模型设计了QFT鲁棒控制器,系统仿真结果表明在该控制器作用下,系统鲁棒性较强. 相似文献
8.
9.
10.
11.
Lucas Merckelbach 《Journal of Marine Science and Technology》2013,18(1):75-86
The demonstrated utility of underwater gliders as measurement platforms for the open ocean has sparked a growing interest in operating them in shallow coastal areas too. Underwater gliders face additional challenges in this environment, such as strong (tidal) currents and high shipping intensity. This work focuses on the probability of losing a glider through a collision with a ship. A ship density map is constructed for the German Bight from observed ship movements derived from automatic identification system data. A simple probability model is developed to convert ship densities into collision probabilities. More realistic—but also more computationally expensive—Monte Carlo simulations were carried out for verification. This model can be used to generate geographic maps showing the probability of glider loss due to collisions. Such maps are useful when planning glider missions. The method developed herein is also applicable to other types of AUVs. 相似文献
12.
S. Drücker D. Steglich L. Merckelbach A. Werner S. Bargmann 《Journal of Marine Science and Technology》2016,21(2):261-270
Underwater gliders, which are profiling autonomous underwater vehicles designed to make oceanographic measurements, are increasingly used in the coastal ocean. As they regularly surface for data transmission, gliders increasingly pose a risk for fast ships. In order to estimate the extent of damage due to collision, 3D finite element simulations of collisions between a glider and a high-speed craft with a glass-fiber reinforced plastic hull are performed. Different collision scenarios such as impact locations, angles of attack and speeds are examined. The results are compared to an analytical solution based on simplifying assumptions. Although both methods reveal consistent results, it is shown that finite element simulations are required to account for the 3D shape of the ship. The results indicate that at ship velocities exceeding 7.5 m/s (14.6 kt) the glider penetrates the ship’s hull causing severe damage to its structure. 相似文献
13.
Surasak Phoemsapthawee Marc Le Boulluec Jean-Marc Laurens Fran ois Deniset 《船舶与海洋工程学报》2013,12(1):112-121
Underwater gliders are recent innovative types of autonomous underwater vehicles (AUVs) used in ocean exploration and observation. They adjust their buoyancy to dive and to return to the ocean surface. During the change of altitude, they use the hydrodynamic forces developed by their wings to move forward. Their flights are controlled by changing the position of their centers of gravity and their buoyancy to adjust their trim and heel angles. For better flight control, the understanding of the hydrodynamic behavior and the flight mechanics of the underwater glider is necessary. A 6-DOF motion simulator is coupled with an unsteady potential flow model for this purpose. In some specific cases, the numerical study demonstrates that an inappropriate stabilizer dimension can cause counter-steering behavior. The simulator can be used to improve the automatic flight control. It can also be used for the hydrodynamic design optimization of the devices. 相似文献
14.
15.
自主式水下滑翔机是一类浮力驱动的无人装备,其控制系统对滑翔机的功能实现至关重要。考虑控制输入受限,以具有不稳定内部动态的水下滑翔机动力学系统为对象,构造前馈控制算法。这种前馈控制方法将有限时间间隔内的转换控制任务视为两点边界值问题,并将输入受限直接并入两点边界值问题中求解。仿真结果表明,在输入受限的情况下,所设计的控制系统能对水下滑翔机进行有效控制,为不稳定的内部动态求出有界的、因果的解。在控制输入无约束和控制输入受限的情况下,各状态变量的变化趋势相同,只是控制过程中各状态变量的幅度变化有所差异。 相似文献
16.
17.
相变材料作为温差能热机的工作流体,其热力学状态对周围海水温度非常敏感,且其融点对水下热滑翔机的运行范围影响很大.基于焓法模型,在不同大洋温度剖面下,对以3种相变材料为工作流体的温差能热机进行性能分析;并考虑到不同大洋温度剖面的特点,为温差能热机选择合适的相变材料,以拓宽水下热滑翔机的应用范围.结果表明:在给定的大洋温度剖面下,3种工作流体的相变过程时间不同;以正十五烷为温差能热机工作流体的水下热滑翔机具有更广的运行范围. 相似文献