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首页> 外文期刊>Ocean Engineering >Three-mode pneumatic management of marine U-tank systems
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Three-mode pneumatic management of marine U-tank systems

机译：船用U型油箱系统的三模式气动管理

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摘要

This paper deals with a new pneumatic control strategy for the roll damping enhancement of marine U-tank stabilizers. The proposed technique consists in a three-mode operation, where the control is active only within a limited resonant range around the ship natural frequency, whereas the control valves are kept closed in the remaining frequency range. Moreover the connection valve between the two air chambers is either closed or partially opened for the low or high frequencies, respectively. The pressurized air for the active control is fed by a turbo-blower set aboard and operates accelerating the motion of the water mass in the U-duct. The theoretical analysis is conducted in the hypothesis of harmonic excitation and includes an equivalent linearization procedure for the turbulent air flow through the upper valve regulating the efflux from the one to the other tank. The application of the laws of thermodynamics to the open air system overhanging the water in each tank chamber reveals the negligibility of the heat transfer through the tank wall in comparison with the mass transfer effects. As a practical result, the mathematical model permits developing a suitable optimization process with the aim at the best damping operation, which however must be subjected to two fundamental constraints: the system stability and the pre-imposed limit power absorbable from the control equipment. Comparing with natural damped passive systems, a reduction of the order of 20-40% can be roughly attained for the resonant roll amplitude, depending on the supplied control power.
机译：本文提出了一种新的气动控制策略，用于增强船用U型油箱稳定器的侧倾阻尼。所提出的技术包括三模式操作，其中控制仅在船舶固有频率附近的有限共振范围内有效，而控制阀在其余频率范围内保持关闭状态。此外，两个气室之间的连接阀分别针对低频或高频关闭或部分打开。用于主动控制的压缩空气由船上安装的涡轮鼓风机供气，并用于加速U型管道中水团的运动。理论分析是在谐波激励的假设下进行的，包括等效的线性化程序，用于通过上阀调节从一个到另一个油箱的排气量的湍流气流。将热力学定律应用于每个水箱腔室中悬于水面上的露天系统，发现与传质效果相比，通过水箱壁的热传递可忽略不计。作为实际结果，该数学模型允许开发以最佳阻尼操作为目标的合适的优化过程，但是该过程必须受到两个基本约束：系统稳定性和可从控制设备吸收的预设极限功率。与自然阻尼无源系统相比，根据所提供的控制功率，谐振侧倾振幅可以大致降低20-40％左右。

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  • 来源
    《Ocean Engineering》 |2012年第12期|p.175-183|共9页
  • 作者

    Francesco Sorge; Stefano Beccari; Marco Cammalleri; Giuseppe Genchi; Emiliano Pipitone;

  • 作者单位

    Dipartimento di Ingegneria Chimica, Gestionale, Informatica, Meccanka, Universka di Palermo, 90128-Palermo, Italy;

    Dipartimento di Ingegneria Chimica, Gestionale, Informatica, Meccanka, Universka di Palermo, 90128-Palermo, Italy;

    Dipartimento di Ingegneria Chimica, Gestionale, Informatica, Meccanka, Universka di Palermo, 90128-Palermo, Italy;

    Dipartimento di Ingegneria Chimica, Gestionale, Informatica, Meccanka, Universka di Palermo, 90128-Palermo, Italy;

    Dipartimento di Ingegneria Chimica, Gestionale, Informatica, Meccanka, Universka di Palermo, 90128-Palermo, Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    U-tank stabilizer; active operation; stability control; optimization;

    机译：U型坦克稳定器;主动操作;稳定性控制;优化;

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