digital_inclass - Introduction Modeling the Sampling...

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Unformatted text preview: Introduction Modeling the Sampling Process The z-Transform Inverse z-Transform Transfer Functions Stability Antenna Control System Unit 10: Digital Control Systems Engineering 5821: Control Systems I Faculty of Engineering & Applied Science Memorial University of Newfoundland April 9, 2009 ENGI 5821 Unit 10: Digital Control Systems Introduction Introduction Computers can be used both in a supervisory role, managing tasks related to control systems and within the feedback loop itself. Introduction Computers can be used both in a supervisory role, managing tasks related to control systems and within the feedback loop itself. Digital control systems have several advantages over purely analog systems: Introduction Computers can be used both in a supervisory role, managing tasks related to control systems and within the feedback loop itself. Digital control systems have several advantages over purely analog systems: 1 Reduced cost (one computer can control multiple systems) Introduction Computers can be used both in a supervisory role, managing tasks related to control systems and within the feedback loop itself. Digital control systems have several advantages over purely analog systems: 1 Reduced cost (one computer can control multiple systems) 2 Flexibility (e.g. software patch vs. hardware upgrade) Introduction Computers can be used both in a supervisory role, managing tasks related to control systems and within the feedback loop itself. Digital control systems have several advantages over purely analog systems: 1 Reduced cost (one computer can control multiple systems) 2 Flexibility (e.g. software patch vs. hardware upgrade) 3 Improved resistance to noise Often the computer will take the place of a cascade compensator. Often the computer will take the place of a cascade compensator. Often the computer will take the place of a cascade compensator. If the signals r and c are analog then analog-to-digital (A/D) and digital-to-analog (D/A) converters are required. D/A conversion is relatively simple and practially instantaneous. D/A conversion is relatively simple and practially instantaneous. A D/A converter requires a set of weighted voltages which must be summed to generate the analog output. D/A conversion is relatively simple and practially instantaneous. A D/A converter requires a set of weighted voltages which must be summed to generate the analog output. Each bit of the digital input controls a electronic switch which determines whether a particular voltage is included in the sum. D/A conversion is relatively simple and practially instantaneous. A D/A converter requires a set of weighted voltages which must be summed to generate the analog output. Each bit of the digital input controls a electronic switch which determines whether a particular voltage is included in the sum. A/D conversion is a two-step process and will incur some delay. A/D conversion is a two-step process and will incur some delay....
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digital_inclass - Introduction Modeling the Sampling...

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