Analysis of Man-in-the-Loop Control Systems in the Presence of Nonlinearities
Abstract
The BRL and HEL are jointly investigating the effects of system nonlinearities on the accuracy of turret control systems with human operators in the loop. The system response at very low rates (one milliradian per second and less) is degraded because of the increased relative importance of nonlinear elements such as coulomb friction, backlash, and dead space. Good low rate response is necessary for accurate tracking of long range targets with laser designators and guided missile directors. This report describes the first phase of the BRL contribution to the joint project. This phase developed a simplified simulation of a turret control with a human transfer function. There is an adaptive algorithm to adjust the coefficients of the human transfer function to account for changes in the system characteristics. Backlash, coulomb friction, and dead space are introduced and their effects on system response and loop performance are documented. The next phase will adjust the simulation to agree with the system response of a concurrent turret measurement program. It will compare the loop performance to a concurrent experiment with a real man-in-the- loop. It will relate loop performance (tracking accuracy) to system response at low rates.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1981
- Accession Number
- ADA102574
Entities
People
- Irving L. Chidsey
- Robert T. Gschwind
Organizations
- Ballistic Research Laboratory