Invention Application
- Patent Title: SYSTEM AND METHOD FOR AVOIDING INADVERTANT ENTRY INTO AN UNSAFE VERTICAL DESCENT SPEED REGION FOR ROTORCRAFT
- Patent Title (中): 避免进入不安全垂直下降速度区域的系统和方法
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Application No.: US14623382Application Date: 2015-02-16
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Publication No.: US20150232176A1Publication Date: 2015-08-20
- Inventor: Luke D. Gillett , Joseph M. Schaeffer , Christopher M. Bothwell , Robert Worsham , Jillian Alfred , Sung Kim
- Applicant: Bell Helicopter Textron Inc.
- Main IPC: B64C27/605
- IPC: B64C27/605 ; B64C27/16 ; B64C27/10

Abstract:
A flight control system having a control law, the control law operable to generate a modified pitch command, the modified pitch command representing a greater amount of collective pitch compared to an amount of collective pitch generated by a first pitch command, the modified pitch command being generated because a vertical descent speed of the rotorcraft at a given forward airspeed is greater than a threshold. A method of avoiding entry into an undesired vertical descent speed region during operation of a rotorcraft, including measuring a forward airspeed; evaluating a vertical descent of the rotorcraft; and generating a modified collective pitch command in respond to a first collective pitch command having a collective pitch value that would cause the rotorcraft to experience a vertical descent rate greater than a threshold value at the forward airspeed of the rotorcraft.
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