Abstract Balance measurements performed by testing sub-scaled ship models determine the global forces and moments acting on the ship, which allows knowing the power required for the ship's movement and provides insight to be applied in the design of the control systems used to steer the ship and to avoid instabilities while sailing. The ship superstructure may produce large separated regions and high air wake turbulence levels resulting in a set of fluctuations of the flow parameters usually determined by measuring velocity or pressure. This paper presents the balance measurement of the aerodynamic forces acting on the ship hull. Aerodynamic forces and moments produced on the ship can be interpreted as an integration of the flow parameters (velocity and pressure distributions) over the ship surface wetted by the air. Balance method provides averaged values and fluctuations of forces coefficients. Aerodynamic environment in the vicinity of a ship is influenced by a large number of factors (atmospheric wind, sea state, ship superstructure, masts, stacks, antennas …) affecting helicopter operations on board ships and their safety during the take-off and landing manoeuvres.

中文翻译：

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护卫舰型舰船模型的平衡测量

摘要 通过测试按比例缩小的船舶模型进行的平衡测量确定了作用在船舶上的整体力和力矩，从而了解船舶运动所需的功率，并提供可应用于用于操纵船舶的控制系统设计的洞察力并避免航行时的不稳定。船舶上层结构可能会产生大的分离区域和高的空气尾流湍流水平，从而导致通常通过测量速度或压力确定的一组流动参数波动。本文介绍了作用在船体上的气动力的平衡测量。船舶上产生的空气动力和力矩可以解释为被空气润湿的船舶表面上的流动参数（速度和压力分布）的积分。平衡法提供力系数的平均值和波动。船舶附近的空气动力环境受多种因素（大气风、海况、船舶上层建筑、桅杆、烟囱、天线……）的影响，这些因素会影响直升机在船上的操作及其在起降操作中的安全性.