Investigation of a Parallel Active Vibration Isolation Mount for Mitigating N/Rev Helicopter Vibrations

Fereidooni, Amin; Graham, Silas; Chen, Eric; Wickramasinghe, Viresh

doi:10.2514/6.2017-1441

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…This was mainly due to the fact that the piezostack actuators cannot provide sufficient stroke required for reduction of the 1/rev vibration. Further development of the technology using miniature electro-magnetic actuators achieved simultaneous WBV reduction at major N/rev peaks including the 1/rev on the shaker table [10][11][12]. These studies demonstrated that an active control solution is effective in the mitigation of WBV for helicopter aircrew.…”

Section: Introductionmentioning

confidence: 82%

“…The Active Seat Mount assemblies were designed for installation between the Bell-412 pilot seat frame and the helicopter floor rails, where each short horizontal support is attached to the upper frame of each seat mount assembly that functioned as a vibration stabilized platform. This arrangement was expected to minimize the impact on the crashworthiness certification of the Bell-412 pilot seat, and also facilitated integration with other existing helicopter seat designs [10,11]. One of the early prototype assemblies is shown in Figure 1a, along with the installation of a Bell-412 nonarmored pilot seat on the prototype active seat system is shown in Figure 1b.…”

Section: Prototype Active Seat Mount Design and Testsmentioning

confidence: 99%

“…Moreover, the performance was consistent across all three manikins, which demonstrated that the prototype multi-axis seat mount system was not only capable of reducing vibrations experienced by the pilot in single directions, but also capable of reducing vibrations in multiple directions. Therefore, the Active Seat Mount system has the potential to suppress the whole-body vibration exposure of the helicopter aircrew to enhance their ride experience and improve their health protection in helicopter flight conditions [10].…”

Section: Prototype Active Seat Mount Design and Testsmentioning

confidence: 99%

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Flight Demonstration of an Active Helicopter Seat System for Aircrew Whole Body Vibration Mitigation

Chen,

Fereidooni,

Laliberte

et al. 2023

10th ECCOMAS Thematic Conference on Smart Structures and Materials

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Helicopter aircrew are exposed to high levels of Whole-Body Vibration (WBV) in fight operations, which may degrade their ride comfort and performance in the short-term, and contribute to adverse health issues in the long-term. The Active Seat Mount technology, presented in this paper, was developed to reduce the whole-body vibration of the helicopter aircrew through active cancellation of the N/rev vibration peaks related to the helicopter main rotor speed. The latest development of the Active Seat Mount technology including structural redesign for integration into the helicopter rear cabin, extensive tests of human occupants on the shaker table and flight tests on the NRC Bell-412 helicopter are described in detail. The shaker and flight test results demonstrated that the redesigned Active Seat Mount achieved significant reduction of the occupant WBV levels at the bottom seat cushion interface per ISO2631-1 metrics and also reduced the occupant head vibrations simultaneously. The promising results show that the Active Seat Mount is capable of improving the ride quality of the Bell-412 helicopter in representative flight conditions and mitigating adverse long-term health issues of the helicopter pilots.

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Section: Introductionmentioning

confidence: 82%

Section: Prototype Active Seat Mount Design and Testsmentioning

confidence: 99%

Section: Prototype Active Seat Mount Design and Testsmentioning

confidence: 99%

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