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新型飞机着陆动载特性研究 被引量:4
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作者 崔云化 岑国平 梁磊 《计算机仿真》 北大核心 2020年第4期15-21,共7页
为了研究道面板在高胎压、大质量、短距离起降的作用下的荷载响应规律,根据新型飞机的受力特性和运动规律,分析起落架-机轮-道面耦合作用,并考虑飞机气动力变化,建立起5自由度的飞机地面动力学模型。通过四阶Runge-Kutta法求解微分方程... 为了研究道面板在高胎压、大质量、短距离起降的作用下的荷载响应规律,根据新型飞机的受力特性和运动规律,分析起落架-机轮-道面耦合作用,并考虑飞机气动力变化,建立起5自由度的飞机地面动力学模型。通过四阶Runge-Kutta法求解微分方程组,研究道面荷载随时间和空间的变化问题。研究结果表明,新型飞机主起落架产生的道面动载系数能达到1.4,飞机下沉速度是影响着陆荷载的主要因素,其次为飞机质量与俯仰角,飞机胎压对着陆荷载影响较小,但对道面板影响较大。 展开更多
关键词 着陆荷载 动载系数 缓冲器 飞机地面动力学模型 数值仿真
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Impact of Passive Heave Compensator on Offshore Lifting 被引量:2
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作者 Arvind Keprate 《Journal of Shipping and Ocean Engineering》 2015年第4期166-180,共15页
Splash zone crossing of the structures with large horizontal surface (e.g. manifolds) and the structures having large weight variation in water and air (e.g. suction anchors) is a critical marine operation. This i... Splash zone crossing of the structures with large horizontal surface (e.g. manifolds) and the structures having large weight variation in water and air (e.g. suction anchors) is a critical marine operation. This is due to the large slamming forces and added mass of the structure, which results in high dynamic loads on the crane. The solution to this could be attaching a PHC (Passive Heave Compensator) between the crane hook and the payload. This paper analyzes the deployment of a subsea manifold with and without PHC unit in North Sea at a water depth of approximately 370 m. A detailed dynamic analysis is done for a seastate of 3 m significant wave height (Hs) over a range of zero up-crossing period (Tz) varying from 3s to 13 s. For better understanding of the result analysis has been done in two stages. The first stage covers the lowering of manifold through the splash zone while second stage covers the seabed landing of the manifold. Based on the results of the analyses it is concluded that PHC tends to reduce the dynamic peak load on the crane. Besides this, it also mitigates the risk of slack wire situations during splash zone crossing of the payload. Furthermore, reduction in both landing velocity and crane tip velocity is also achieved by using a well-designed PHC unit. 展开更多
关键词 PHC dynamic analysis Orcaflex.
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