What is the principle of superposition?

The response produced by the simultaneous application of two different forcing functions is the sum of the two individual responses.

What is a transfer function?

The ratio of the Laplace transform of the output variable to the Laplace transform of the input variable.

What is the characteristic equation in control systems?

The denominator polynomial R(s), when equal to zero.

What is a block diagram?

A pictorial representation of the functions performed by each component of a system and the flow of signals.

What does a summing point represent in a block diagram?

It indicates a summing operation.

What is Mason's rule?

A method for finding transfer functions of linear time-invariant systems represented by their block diagrams.

What are the main elements of a signal flow graph?

1. Branch 2. Node 3. Path 4. Loop

What is the purpose of feedback in a closed-loop system?

To allow the output to be compared with the input to form the appropriate control action.

What is the difference between open-loop and closed-loop systems?

Open-loop systems do not use feedback, while closed-loop systems do.

What is the role of the controller in a control system?

To control the plant based on the error signal.

What is a disturbance or noise input?

An undesired stimulus or input signal affecting the value of the controlled output.

What is the significance of the takeoff point in a block diagram?

It allows the same signal or variable as input to more than one block or summing point.

What are the objectives of control systems analysis and design?

1. Producing 2. Minimizing 3. Achieving stability.

What is a linear system?

A system where input/output relationships may be represented by a linear differential equation.

What is a time-invariant system?

A system described by a differential equation with constant coefficients.

What is the purpose of a measurement element in a feedback system?

To produce a signal related to the variable condition of the process being controlled.

What is the significance of the summing point in a control system?

It compares the required value of the variable being controlled with the measured value.

What are the emerging application areas of control systems?

1. Material Processing 2. Noise and Vibration Control 3. Intelligent Vehicle Highway Systems 4. Smart Engine.

What is the main advantage of feedback in control systems?

Increased accuracy compared with open-loop systems.

What is the role of the actuator in a control system?

To produce a change in the process aiming to correct or change the controlled condition.

What is the definition of a path in a signal flow graph?

A succession of branches from a source node to a sink node with all arrowheads in the same direction.

What is the purpose of control systems?

To achieve desired responses by regulating inputs.

What is the definition of a physical system?

A system in which physical objects are connected to perform an objective.

What are the types of physical systems?

Mechanical, Electrical, Electronic, Thermal, Hydraulic, Chemical.

What is the purpose of mathematical modeling in control systems?

To determine performance through transfer functions.

What is the definition of a closed-loop transfer function ratio?

C/R – closed loop transfer function ratio.

What is the definition of an input transducer?

Converts the form of input to that used by the controller.

What is the definition of a loop in control systems?

A path that originates and terminates on the same node, with no other node encountered more than once.

What is the definition of path gain?

The product of the branch gains encountered in traversing a path.

What is the definition of a regulator in control systems?

A feedback control system where the reference input is constant for long periods.

What is the definition of a time-variant system?

A system if the parameters vary as a function of time.

What is the definition of a feedback path?

The transmission path from the controlled output back to the summing point.

What is the definition of a forward path?

The transmission path from the summing point to the controlled output.

What is the definition of a control law?

It determines what action to take when an error signal is received.

What is the definition of a correction element in a control system?

Often called the final control element, it produces a change in the process.

What is the definition of a disturbance in control systems?

An undesired stimulus or input signal affecting the controlled output.

What is the definition of a feedback element?

Establishes the fundamental relationship between the controlled output and the primary feedback signal.

What is the definition of a feedback path?

The transmission path from the controlled output back to the summing point.

What is the definition of a primary feedback signal?

A function of the controlled output summed with the reference input to establish the actuating or error signal.

What is the definition of a time response in control systems?

The output as a function of time following the application of a prescribed input.

What is the definition of a transducer?

A device that converts one energy form into another.

What is the definition of a path in control systems?

Any collection of a continuous succession of branches traversed in the same direction.

Control Systems Flashcards

Student preview

141 questions

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1.

FLASHCARD QUESTION

Front

What is a control system?

Back

A system of getting output by regulating, commanding, and directing the input.

2.

FLASHCARD QUESTION

Front

What are the basic components of feedback/closed-loop control systems?

Back

1. Plant 2. Feedback 3. Error detector 4. Controller

3.

FLASHCARD QUESTION

Front

What is the function of the error detector in a control system?

Back

To compare the reference input with the feedback signal.

4.

FLASHCARD QUESTION

Front

What is negative feedback?

Back

Implies that the summing point is a subtractor.

5.

FLASHCARD QUESTION

Front

What is positive feedback?

Back

Implies that the summing point is an adder.

6.

FLASHCARD QUESTION

Front

What are the advantages of closed-loop control systems?

Back

1. High Accuracy 2. Quick Response 3. Flexibility 4. Reduces the effect of distortion

7.

FLASHCARD QUESTION

Front

What is a servomechanism?

Back

A feedback control system used to control position, velocity, and acceleration.

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