Analysis of Inherent Errors in Asynchronous Redundant Digital Flight Control Systems.
Final rept. 9 Jun-31 Oct 75,
AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The concept of skewed sampling is developed and a single-rate, closed-loop state variable model for realistic aircraft control loops is developed. Using this model, a covariance analysis of the channel differences is given. This statistical treatment is based on filtered white noise external inputs, but it is shown how such inputs can be used to generate signals which approximate the true system external inputs. The model and the analysis are general and applicable to a variety of systems. A user-oriented software package, using FORTRAN, is developed to facilitate the required computations and to allow parametric studies of the effect on inherent errors of control system gains, time constants, sample time and other parameters. The analysis is applied to several examples, including time and other parameters. The analysis is applied to several examples, including a study of inherent errors in an asynchronous dual-redundant digital version of the A-7D pitch-axis control augmentation system.
- Flight Control and Instrumentation