Microprocessor Requirements for Implementing Modern Control Logic.
Abstract
Analytical procedures for establishing microprocessor requirements for multivariable feedback control of linear stochastic dynamic systems were developed and evaluated. Key issues in microprocessor implementation of modern estimation and control logic include (1) accuracy, (2) computational capability including arithmetic as well as interface speed, and (3) memory requirements. Compatibility of current microprocessor technology with the established implementation requirements was assessed. The analytical method to establish microprocessor accuracy requirements for closed-loop digital control of linear stochastic systems is based upon defining a quadratic performance index that provides a quantitative measure of performance degradation. This method is employed to determine closed-loop system time response sensitivity to (1) microprocessor word length and (2) system structure (standard, Jordan canonical or companion forms) within the control logic. The developed procedures were evaluated and illustrated by application to (1) a second-order system and (2) a linearized fifth-order F100 turbofan engine model. Results were verified using a digital simulation of a continuous system/microprocessor controller. Microprocessors considered were the Intel 8080 microprocessor (an 8 bit microprocessor) and the Digital Equipment Corporation (DEC) LSI 11/2 microprocessor (a 16 bit microprocessor).
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1979
- Accession Number
- ADA067551
Entities
People
- Florence A. Farrar
- Richard S. Eidens
Organizations
- United Technologies Corporation