Author: S. N. GittensPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Microprocessor-based Digital Flight Control System for an R.P.V.
Author: S. N. GittensMicroprocessor-based Digital Flight Control System Design for an R.P.V.
Author: Simon Nevis GittensDigital Flight Control Research Using Microprocessor Technology
Author: Robert F. StengelPublisher:
ISBN:
Category :
Languages : en
Pages : 152
Book Description
A digital flight control system based on microprocessor technology was designed, developed, and flight tested in Princeton's Variable-Response Research Aircraft (VRA). The microprocessor-based digital flight control system works in conjunction with the VRA's existing fly-by-wire control system, and is programmed to provide command and stability augmentation control laws formulated through modern control theory. The initial flight control computer program, CAS-1, provides direct, pitch rate, and normal acceleration command modes. The latter two closed-loop control laws are designed using sampled-data linear-quadratic regulator theory. The computer hardware and software are described and initial flight test results are presented. Flight test results are based on two longitudinal manual control tasks: tracking at altitude and approach and landing. They demonstrate the effects of varying sampling rate, computation delay, and control resolution on calibrated step response and on pilot opinion ratings. It is concluded that the pilot can provide effective control with lower sampling rates and control resolution than might have been anticipated. The limiting values are task dependent, generally lying in the range of 5 to 10 samples per sec and 4- to 8-bit resolution. Flight test results with pure time delay tend to confirm that there is rapid degradation of pilot opinion as the delay increases beyond 0.2 sec.
Microprocessor-Based Digital Autopilot Development for the XBQM-106 Mini-RPV.
Author: Olin D. KogerPublisher:
ISBN:
Category :
Languages : en
Pages : 278
Book Description
The development of a digital autopilot for the XBQM-106 Mini-Remotely Piloted Vehicle(RPV) is described. The design is based on the RCA CDP-1802 microprocessor with ultra-low component cost as a primary goal. The digital autopilot is developed through the breadboard stage, and performance testing is accomplished via hybrid simulation. First, aircraft transfer functions are derived from aerodynamic wind tunnel data. Then a complete control analysis is made of the existing analog autopilot, sensors, actuators, and aircraft dynamics. This is followed by synthesis of the digital algorithms(including a digital filter) by means of digitization. Hardware is selected based on system requirements, and hardware design details are included. Software to execute the digital algorithms is developed and described. The results of testing by hybrid simulation show that the performance of the digital autopilot is comparable to the existing analog autopilot. Finally, recommendations for the follow-on study are included. (Author).
NASA SP.
Author: Aeronautical Engineering
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 736
Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
A Remotely Augmented Vehicle Approach to Flight Testing RPV Control Systems
Author: A Flight Investigation of Digital Control Using Microprocessor Technology
Author: James C. SeatPublisher:
ISBN:
Category :
Languages : en
Pages : 164
Book Description
A microprocessor-based digital flight control system (Micro-DFCS) is implemented in Princeton's Variable-Response Research Aircraft (VRA), and evaluated through flight testing. The flight control computer program, CAS-1, provides three longitudinal control options; direct (unaugmented) command, pitch rate command, and normal acceleration command. The latter two options are Type 0 systems designed by linear-quadratic control theory. The flight tests are designed to investigate the characteristics of these control laws in flight, to provide experimental evidence for sampling rate requirements, and to demonstrate digital flight control of the VRA with the Micro-DFCS.
Digital Control Loading - A Microprocessor-Based Approach
Author: D. ParkinsonPublisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
This paper reports on a multi-year development effort to provide exact simulation of aircraft primary control systems under all conditions of aircraft control and operation for all regimes of flight and environment conditions. The development demonstrated the ability to develop realistic models and provide for their exact solution via digital computation while integrated with a highly responsive control force simulation system. Digital quantization effects are eliminated by very high rates of computation achieved by using dedicated microprocessors within the control loop, resulting in no degradatin of control feel, smoothness, or response. Further improvements in long-term stability, calibration, and measurement are also achieved. The paper discloses the results of various comparative analyses between digital and analog, for various force and position servo loops, leading to the development of a microprocessor-based digital control loading system. Trace comparisons are made between the final breadboard system versus actual aircraft control measurements for force/displacement and dynamic stick response tests to demonstrate the fidelity achieved by the system. (Author).
Proceedings of the IASTED International Symposium, Modelling, Identification, and Control
Author: International Association of Science and Technology for DevelopmentPublisher: Anaheim [Calif.] ; Calgary : Acta Press
ISBN:
Category : Computers
Languages : en
Pages : 470
Book Description