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1. 发明申请

WO0140051A3 AIRCRAFT TAILSTRIKE AVOIDANCE SYSTEM 审中-公开
标题翻译：飞机尾迹避让系统
公开(公告)号：WO0140051A3
公开(公告)日：2001-10-25
申请号：PCT/US0032862
申请日：2000-11-30
申请人： BOEING CO
发明人： DEWITT WENDI M , EGGOLD DAVID P , EVANS MONTE R , SANKRITHI MITHRA M K V , WELLS STEPHEN L
IPC分类号： G05D1/06 , G05D1/08
CPC分类号： G05D1/0808 , B64C13/503 , B64D45/04 , G05D1/0653
摘要： An improvement to an aircraft flight control system is provided for reducing the likelihood of an aircraft tailstrike. The flight control system includes a pitch command provided to a pitch control device for altering the aircraft's pitch attitute. The improvement is a system of altering the pitch command to avoid an aircraft tailstrike. The improvement includes determining a current tailskid closure rate and a current tail height; comparing the current tailskid closure rate with a threshold closure rate to determine an excess closure rate amount; and adding an incremental nose-down pitch command with the pitch command to avoid a potential aircraft tailstrike. The threshold closure rate is dependent upon the current tailskid height. The incremental nose-down pitch command is calculated as a function of the excess closure rate amount. An alternative embodiment is provided in which the current height is compared with a threshold height (that is a function of the current tailskid closure rate) to determine an excess height amount. The excess height is then used to form an incremental nose-down pitch command. Another embodiment is described using both height and rate thresholds to calculate the incremental nose-down pitch command. Alternative arrangements may be used in which other non-derivative and derivative values are used, e.g., pitch angle margin and pitch rate.
摘要翻译：提供了对飞机飞行控制系统的改进以减少飞机尾随打击的可能性。飞行控制系统包括提供给俯仰控制装置的俯仰指令，用于改变飞机的俯仰姿态。改进是改变俯仰指令以避免飞机尾随打击的系统。改进包括确定当前尾部封闭率和当前尾部高度; 将当前尾部封闭率与阈值封闭率进行比较以确定过度封闭率金额; 并用俯仰指令增加一个增加的俯仰俯仰指令以避免潜在的飞机尾随打击。阈值闭合率取决于当前的尾巴高度。增量下降俯仰指令是根据超额关闭率数量计算的。提供了一个替代实施例，其中将当前高度与阈值高度（其是当前尾部闭合速率的函数）进行比较以确定超额高度量。多余的高度然后用于形成增量降低俯仰角度命令。使用高度和速率阈值二者来描述另一个实施例来计算增量式鼻下俯仰命令。可以使用其他非衍生值和派生值的替代布置，例如，俯仰角边缘和俯仰角速度。

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