# ELG 3155 Lecture Notes - Lecture 1: Hard Disk Drive, Cruise Control, Laserdisc

## Document Summary

Computer hard disk drive, showing disks and read/write head. Figure 1. 4: video laser disc player, objective lens reading pits on a laser disc, optical path for playback showing tracking mirror rotated by a control system to keep the laser beam positioned on the pits. Each control system consists of the following subsystems: Using both the open-loop control and the closed- loop control systems, analyze the cruise control system of an automobile. grade, w(t) desired speed r(t) throttle, u(t) controller car actual speed c(t) Open loop cruise control system grade, w(t) e(t) throttle, u(t) controller car desired speed r(t) actual speed c(t) For this problem, the mathematical model of our plant (the car) is given below. grade, w(t) Examples of u=6. 5 when w=0, c= 65 km when w=1, c=60 km. 10)w5. 0u(c example: simple cruise control system of an automobile (3) Analysis of open-loop control system (for the throttle) with u = r/10 where r is the desired speed.