Inlet duct selector for tiltrotor barrier filter

    公开(公告)号:US10023296B2

    公开(公告)日:2018-07-17

    申请号:US15232465

    申请日:2016-08-09

    Abstract: The present invention includes an air flow bypass for a tiltrotor engine comprising: a ram air inlet comprising bypass door(s) capable of at least partially or fully blocking a ram air flow through the ram air inlet; a barrier filter inlet positioned in a side, a bottom, and/or a top of a tiltrotor engine nacelle; a filter plenum; a selector duct comprising one or more openings; and one or more selector duct doors or covers over the one or more openings; wherein the barrier filter inlet, the filter plenum, the one or more openings in the selector duct, the selector duct, and an engine are in fluid communication and the bypass door(s) in the ram inlet are closed and the barrier filter inlet provides filtered air flow to the engine when the aircraft is in hover operations.

    Rotor Assembly with High Lock-Number Blades
    406.
    发明申请

    公开(公告)号:US20180186447A1

    公开(公告)日:2018-07-05

    申请号:US15398919

    申请日:2017-01-05

    CPC classification number: B64C27/35 B64C27/33 B64C27/48 B64C27/51 B64C27/54

    Abstract: An aircraft rotor assembly has a central yoke and a plurality of rotor blades coupled to the yoke for rotation with the yoke about an axis, each blade having a Lock number of approximately 5 or greater. A lead-lag pivot for each blade is a radial distance from the axis and allows for in-plane lead-lag motion of the associated blade relative to the yoke, each pivot allowing for in-plane motion from a neutral position of at least 1 degree in each of the lead and lag directions. Lead and lag motion of each blade is opposed by a biasing force that biases the associated blade toward the neutral position, and the biasing force is selected to achieve a first in-plane frequency of greater than 1/rev for each blade.

    DIAGNOSTIC METHOD, SYSTEM AND DEVICE FOR A ROTORCRAFT DRIVE SYSTEM

    公开(公告)号:US20180165897A1

    公开(公告)日:2018-06-14

    申请号:US15677962

    申请日:2017-08-15

    Abstract: There is a method, system, and device for diagnosing an anomaly of a monitored component in a drive train, the method including obtaining original data based on samples of a vibration signal and a tachometer signal; generating a time synchronous average vibration signal; processing the time synchronous average vibration signal to produce a frequency-domain spectrum; determining the complex magnitudes of the frequency-domain spectrum; selecting a sub-synchronous band of the complex magnitudes of the frequency-domain spectrum to generate a sub-synchronous spectrum; and determining the mean of the sub-synchronous spectrum to generate a condition indicator.

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