NDLI: Controls design with crossfeeds for hovering rotorcraft using quantitative feedback theory

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Controls design with crossfeeds for hovering rotorcraft using quantitative feedback theory

Content Provider	NASA Technical Reports Server (NTRS)
Author	Biezad, Daniel J. Cheng, Rendy Tischler, Mark B.
Copyright Year	1996
Description	A multi-input, multi-output controls design with dynamic crossfeed pre-compensation is presented for rotorcraft in near-hovering flight using Quantitative Feedback Theory (QFT). The resulting closed-loop control system bandwidth allows the rotorcraft to be considered for use as an inflight simulator. The use of dynamic, robust crossfeeds prior to the QFT design reduces the magnitude of required feedback gain and results in performance that meets most handling qualities specifications relative to the decoupling of off-axis responses. Handling qualities are Level 1 for both low-gain tasks and high-gain tasks in the roll, pitch, and yaw axes except for the 10 deg/sec moderate-amplitude yaw command where the rotorcraft exhibits Level 2 handling qualities in the yaw axis caused by phase lag. The combined effect of the QFT feedback design following the implementation of low-order, dynamic crossfeed compensators successfully decouples ten of twelve off-axis channels. For the other two channels it was not possible to find a single, low-order crossfeed that was effective. This is an area to be investigated in future research.
File Size	622521
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960014822
Archival Resource Key	ark:/13960/t6vx5935w
Language	English
Publisher Date	1996-01-08
Access Restriction	Open
Subject Keyword	Aircraft Stability And Control Mean Square Values Degrees of Freedom Cross Coupling Control Systems Design Transfer Functions Computerized Simulation Feedback Control Yaw Hovering Compensators Aircraft Models Metrication Decoupling Flight Simulators Bandwidth Feedforward Control Controllability Rotary Wing Aircraft Roll Weighting Functions Quantitative Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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