ME5659_LecSuppl_FeedbackControlReview_1

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Figure 1.1 Simplified description of a control system
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a. Early elevators were controlled by hand ropes or an elevator operator. Here, a rope is cut to demonstrate the safety brake, an innovation in early elevators; b. Modern Duo-lift elevators make their way up the Grande Arche in Paris, driven by one motor, with each car counterbalancing the other. Today, elevators are fully automatic, using control systems to regulate position and velocity. Figure 1.2 Elevators Photos courtesy of United Technologies Otis Elevator.
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