Abstract Morphing wing structures are widely considered among the most promising technologies for the improvement of aerodynamic performances in large civil aircraft.The controlled adaptation of the wing shape to exte...Abstract Morphing wing structures are widely considered among the most promising technologies for the improvement of aerodynamic performances in large civil aircraft.The controlled adaptation of the wing shape to external operative conditions naturally enables the maximization of aircraft aerodynamic efficiency,with positive fallouts on the amount of fuel burned and pollutant emissions.The benefits brought by morphing wings at aircraft level are accompanied by the criticalities of the enabling technologies,mainly involving weight penalties,overconsumption of electrical power,and safety issues.The attempt to solve such criticalities passes through the development of novel design approaches,ensuring the consolidation of reliable structural solutions that are adequately mature for certification and in-flight operations.In this work,the development phases of a multimodal camber morphing wing flap,tailored for large civil aircraft applications,are outlined with specific reference to the activities addressed by the author in the framework of the Clean Sky program.The flap is morphed according to target shapes depending on aircraft flight conditions and defined to enhance high-lift performances during takeoff and landing,as well as wing aerodynamic efficiency during cruise.An innovative system based on finger-like robotic ribs driven by electromechanical actuators is proposed as morphing-enabling technology;the maturation process of the device is then traced from the proof of concept to the consolidation of a true-scale demonstrator for pre-flight ground validation tests.A step-by-step approach involving the design and testing of intermediate demonstrators is then carried out to show the compliance of the adaptive system with industrial standards and safety requirements.The technical issues encountered during the development of each intermediate demonstrator are critically analyzed,and justifications are provided for all the adopted engineering solutions.Finally,the layout of the true-scale demonstrator is presented,wit展开更多
为了实现电动舵机工作过程中多种故障的一体化诊断,提出了一种基于双阶段注意力的长短期记忆网络(DaLSTM)组合模型的故障诊断方法。首先,将电动舵机的多源传感器信号作为输入,采用基于输入注意力和时间注意力的长短期记忆网络(LSTM)自...为了实现电动舵机工作过程中多种故障的一体化诊断,提出了一种基于双阶段注意力的长短期记忆网络(DaLSTM)组合模型的故障诊断方法。首先,将电动舵机的多源传感器信号作为输入,采用基于输入注意力和时间注意力的长短期记忆网络(LSTM)自适应提取原始多源传感器数据中的相关特征,并通过DaLSTM组合模型实现多源传感器的时间序列预测。其次,在故障诊断时间窗口内,以不同工作状态下DaLSTM组合模型预测值与采样值的差值最小为决策函数诊断电动舵机的故障类型。最后,利用公开的美国国家航空航天局(National Aeronautics and Space Administration, NASA)数据集进行时间序列预测和故障诊断实验,对故障类别的平均识别率达到了98.76%,证明了该方法的有效性。展开更多
基金The researches described in this paper have been carried out in the framework of the Clean Sky Green Regional Aircraft ITD(Low Noise Configuration Domain)and Airgreen2 projectsThe activities have gratefully received funding respectively from the Cleans Sky and the Clean Sly 2 Joint Undertaking,under the European Union FP7 and H2020 research and innovation programs,Grant Agreements No.CSJU-GAM-GRA-2008-001 and No.807089—REG GAM 2018—H2020-IBA-CS2-GAMS-2017.
文摘Abstract Morphing wing structures are widely considered among the most promising technologies for the improvement of aerodynamic performances in large civil aircraft.The controlled adaptation of the wing shape to external operative conditions naturally enables the maximization of aircraft aerodynamic efficiency,with positive fallouts on the amount of fuel burned and pollutant emissions.The benefits brought by morphing wings at aircraft level are accompanied by the criticalities of the enabling technologies,mainly involving weight penalties,overconsumption of electrical power,and safety issues.The attempt to solve such criticalities passes through the development of novel design approaches,ensuring the consolidation of reliable structural solutions that are adequately mature for certification and in-flight operations.In this work,the development phases of a multimodal camber morphing wing flap,tailored for large civil aircraft applications,are outlined with specific reference to the activities addressed by the author in the framework of the Clean Sky program.The flap is morphed according to target shapes depending on aircraft flight conditions and defined to enhance high-lift performances during takeoff and landing,as well as wing aerodynamic efficiency during cruise.An innovative system based on finger-like robotic ribs driven by electromechanical actuators is proposed as morphing-enabling technology;the maturation process of the device is then traced from the proof of concept to the consolidation of a true-scale demonstrator for pre-flight ground validation tests.A step-by-step approach involving the design and testing of intermediate demonstrators is then carried out to show the compliance of the adaptive system with industrial standards and safety requirements.The technical issues encountered during the development of each intermediate demonstrator are critically analyzed,and justifications are provided for all the adopted engineering solutions.Finally,the layout of the true-scale demonstrator is presented,wit
文摘为了实现电动舵机工作过程中多种故障的一体化诊断,提出了一种基于双阶段注意力的长短期记忆网络(DaLSTM)组合模型的故障诊断方法。首先,将电动舵机的多源传感器信号作为输入,采用基于输入注意力和时间注意力的长短期记忆网络(LSTM)自适应提取原始多源传感器数据中的相关特征,并通过DaLSTM组合模型实现多源传感器的时间序列预测。其次,在故障诊断时间窗口内,以不同工作状态下DaLSTM组合模型预测值与采样值的差值最小为决策函数诊断电动舵机的故障类型。最后,利用公开的美国国家航空航天局(National Aeronautics and Space Administration, NASA)数据集进行时间序列预测和故障诊断实验,对故障类别的平均识别率达到了98.76%,证明了该方法的有效性。
