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الموضوع: Practical Control System

  1. #1
    Junior Engineer الصورة الرمزية Mohamed.Diaa
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    May 2010
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    2 Ahmed Onsy St. Helwan
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    Practical Control System

    السلام عليكم الاخوة الافاضل
    اعرفكم بنفسى محمد ضياء مهندس ميكاترونيك 2007 و حاليا ادرس الى جانب العمل ماجستير نظم التحكم الآلى بهندسة القاهرة و انشاء الله سأشارك بكل ما املك من علم لأفيد اخوتى، و اتمنى ان يوفقنى الله.
    سأبدأ بما يعرفه البعض عن الكنترول و لكن قبلها اود ان انوٌه ان الشرح بالانجليزية للتوافق مع المناهج المدرٌسة
    Process
    It is the subject of the control, usually concerning about one input that can manipulate the process (dominant input) and one output that is manipulated by the input, processes are usually classified by Order (Class), Speed, Natural time delay.
    Controller
    It is the device used to control a process usually consists of input signal conditional, control unit (Brain) and output signal limiter.
    Sensor
    It serves as an indication of the process output and it is the input for the controller
    Actuator
    It is the device that “acts” which means it is the muscle of the system which makes a real change in the manipulating input to affect the manipulated output
    Automatic Control System
    It’s the combination of the Controller, sensors, and actuators
    هذه البداية و اود ان اعلم ما هى الانطباع للاخوة و للعلم هذا الشرح ليس من كتاب معين او منقول

  2. #2
    مشرف قسم المحركات و دوائر الـ PLC
    تاريخ التسجيل
    Oct 2006
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    jerusalem
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    2,254

    رد: Practical Control System

    السلام عليكم ورحمة الله وبركاته

    انشاء الله تعالى جيد , ونود ان تكمل الموضوع , ومع الاستمرارية سنثبت الموضوع , مشكور على المبادرة .

  3. #3
    Junior Engineer الصورة الرمزية Mohamed.Diaa
    تاريخ التسجيل
    May 2010
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    2 Ahmed Onsy St. Helwan
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    رد: Practical Control System

    و عليكم السلام ورحمة الله وبركاته ربنا يوفقنا ان شاء الله و شكرا للتقدير

  4. #4
    Junior Engineer الصورة الرمزية Mohamed.Diaa
    تاريخ التسجيل
    May 2010
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    2 Ahmed Onsy St. Helwan
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    رد: Practical Control System









    #2
    The Process in depth: Example Water Level System
    Characteristics of the process
    Process Input
    The process input is the input water flow rate Qin
    Process Output
    The process output is the output water flow rate Qout
    Synthesis problem - Scope
    To keep the water level in the tank almost constant by changing the process input water flow rate
    Process lag
    It’s the time delay between applying new setpoint or disturbance and a valuable output change of the process exsists
    Process Load
    The set of values for the process parameters that results in an identified setpoint (nominal setpoint), excluding the process input



  5. #5
    Junior Engineer الصورة الرمزية انس رستم
    تاريخ التسجيل
    Jun 2010
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    syria
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    رد: Practical Control System

    جزاك الله خيرا

  6. #6
    Junior Engineer الصورة الرمزية Mohamed.Diaa
    تاريخ التسجيل
    May 2010
    الدولة
    2 Ahmed Onsy St. Helwan
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    31

    رد: Practical Control System

    جازانا الله جميعا خيرا و شكرا للتثبيت لأدارة المنتدى

  7. #7
    Junior Engineer الصورة الرمزية usama shewy
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    Sep 2007
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    egypt
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    رد: Practical Control System

    go ahead

  8. #8
    Junior Engineer الصورة الرمزية Mohamed.Diaa
    تاريخ التسجيل
    May 2010
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    2 Ahmed Onsy St. Helwan
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    رد: Practical Control System

    The Controller in depth
    The Controller is the brain of the system, its main functions is
    Track a setpoint correctly
    Reject the disturbance on the system

    Dead time
    It’s the time delay between applying new setpoint or disturbance and a first output change of the process exists, this lag is function of the controller AND the process
    Controller Modes
    a) Discontinuous control Mode
    The control action is binary (Full on – Full off), example, the light switch


    b) Multiple point Mode
    The control action takes several values more than two, example the fan switch, it contains more than two speeds

    c) Continuous control Mode
    The controller output is changing with respect to the input signal and changing with time

    [IMG]http://www.bmb.leeds.ac.uk/illingworth/****bol/control.gif[/IMG]

  9. #9
    Junior Engineer الصورة الرمزية Mohamed.Diaa
    تاريخ التسجيل
    May 2010
    الدولة
    2 Ahmed Onsy St. Helwan
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    31

    رد: Practical Control System

    Scope: Digital Systems
    Types of Controllers
    a) Analog Controller
    Most famous and the oldest control theory, its control analysis is usually done in the Laplace Domain, the process is analog process too

    b) Discrete Controller
    The opposite of the analog controller completely, where the process is digital and the controller is digital also, example, the digital signal control and processing

    c) Direct Digital Controller - DDC
    It’s the microprocessor based controller, its control analysis is done in Z-domain or in discrete time, the process is analog and the controller is digital

    d) Networked Controller - NC
    The most modern type of controllers, it’s consisted of number of DDCs which deal directly with the process, and computer controller which changes the setpoints of the DDCs to meet a required specification, the controllers are connected by using a communication network, which has a separate design and control specifications, and one of the most recently researched field

    Control Techniques
    a) Feedforward Control Technique
    This technique is used to achieve the first goal of the controller which is Tracking a setpoint or a reference signal

    b) Feedback Control Technique
    This technique is used to achieve the second goal, which is Rejecting the disturbance and eliminate the residual error in the system

  10. #10
    Junior Engineer الصورة الرمزية Mohamed.Diaa
    تاريخ التسجيل
    May 2010
    الدولة
    2 Ahmed Onsy St. Helwan
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    31

    رد: Practical Control System



    #5
    Automatic Control System

    a) Setpoint b)

    It’s an indication to a desired input value by the operator


    b) Process Output Indication c)

    It’s the feedback from the sensor which is an indication of the real process output value


    c) Error indication b-c)

    It’s the Controller input, which is the difference between the current Setpoint and the Feedback


    d) Controller Output u)
    It’s the control action taken by the controller, which is based on the computation and control techniques used in the controller


    e) Actuator

    It’s the device that converts the control action taken to corresponding input to the plant, usually standard (4-20 mA) is used as indication to the controller output to the actuator


    f) Sensor

    It’s the device that converts the process output to corresponding input to the feedback loop, usually standard (4-20 mA) is used as indication to the process output


    g) Differential gap

    Time delay is used when dealing with slow process (e.g. Thermal process, where the process lag can be minutes), the differential gap is that a change in the process output that doesn’t affect the controller output at the same time, but takes a predefined time to change the controller output

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