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Investigation of Helicopter Seat Structural Dynamics for Aircrew Vibration Mitigation

机译：减轻机组人员振动的直升机座椅结构动力学研究

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This paper presents the investigation of helicopter seat structural dynamics to identify solutions to mitigate vibration levels transmitted to aircrew. Flight test was conducted on a Bell-412 helicopter to measure aircrew vibration levels to characterize the vibration transmission through seat structures. Modal analysis was conducted to characterize the seat/aircrew dynamics. The critical vibration modes that contributed to the aircrew vibrations have been identified. To mitigate aircrew vibrations, several cushion materials have been evaluated through flight tests. The combination of original Bell-412 seat cushion with an urethane pad demonstrated promising results, indicating the vibration isolation performance can be improved through optimization of cushion impedance properties. Active seat structural modification was also investigated. Two stacked piezoelectric actuators were retrofitted on a Bell-412 seat frame to function as active struts to reduce critical vibration modes experienced by a mannequin. Closed-loop experimental results demonstrated simultaneous suppression of critical mannequin vibration modes to achieve significant global reduction of the mannequin vibration levels. The experiment verified the effectiveness of adaptive helicopter seat mount concept for aircrew vibration mitigation applications.
机译：本文介绍了对直升机座椅结构动力学的研究，以确定减轻传递到机组人员的振动水平的解决方案。在Bell-412直升机上进行了飞行测试，以测量机组人员的振动水平，以表征通过座椅结构传递的振动。进行模态分析以表征座椅/机组人员的动力学。已经确定了导致机组人员振动的临界振动模式。为了减轻机组人员的振动，已经通过飞行测试评估了几种缓冲材料。原始的Bell-412座垫与氨基甲酸乙酯垫的组合显示出令人鼓舞的结果，表明可以通过优化垫的阻抗特性来提高隔振性能。还研究了主动座椅的结构修改。在Bell-412座椅框架上改装了两个堆叠式压电致动器，以用作主动支柱，以减少人体模型所经历的临界振动模式。闭环实验结果表明，可以同时抑制关键的人体模特振动模式，以实现人体模特振动水平的整体显着降低。实验证明了自适应直升机座椅安装概念在减轻机组人员振动方面的有效性。

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