Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Instrumentation And Control > Static Performance Characteristics > Flashcards

Static Performance Characteristics Flashcards

1
Q

Range or span

A

Minimum and maximum values of a quantity that the instrument is designed to measure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is instrumentation?

A

Application of instruments for monitoring,sensing and measurement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Static performance characteristics

A

Part of the data specification for a particular instrument

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Repeatability

A

Display the same reading on a number of occasions when input is applied at short intervals of time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Stability

A

Display the same reading on a number of occasions when input is applied over a long period of time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Accuracy and precision

A

Accuracy is stated in terms of errors introduced

Precision is a measure of how close together the results lie

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Resolution

A

Measure of the smallest detectable change in the instrument output

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Non linearity

A

Measure of the maximum deviation from a linear input/output relationship

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Tolerance

A

Measure of the maximum allowable error

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Threshold

A

Measure of the minimum level of input required to produce an observable change in the instrument output

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Zero drift

A

Where the zero reading is altered by a change in ambient conditions.
Normally removable be re-calibration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Sensitivity equation

A

Change in output/change in input

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Measuring system

A

Primary quantity – transducer -(transducer signal)-signal conditioner -(conditioned signal)-display or recorder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Transducer

A

Is an energy converter which receives the physical quantity being measured and converts it into some other physical variable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Signal conditioner

A

Rearranged the signal into a form which can be readily recorded or monitored

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Main features of an open loop system

A

1-no comparison between actual and set values

2-each input setting determines a fixed operation condition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Main features of a closed loop system

A

1-output is fed back so that comparisons can be made with the set point

2- closed loop systems have a self regulating property since any external disturbance will change the output , resulting in an error signal being generated by the comparison element

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Open loop system basic elements diagram

A 
Input
Control element
Actuator
Process or plant
Output
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Control element

A

Determines action to be taken with reference to input to the control system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Actuator

A

Responds to input from control element and initiates action to change the variable to the required value

21
Q

Process or Plant

A

Is the system of which a variable is being controlled

22
Q

Closed loop control system basic element

A 
Input
Control element 
Actuator
Process or plant
Measurement element
23
Q

Comparison element

A

Compares reference and actual output variable elements and produces error signal

24
Q

Control element

A

Decides on action when receives error signal

25
Q

Actuator

A

Produces change in process to remove error

26
Q

Process or plant

A

Is the system in which a variable is being controlled

27
Q

Basic forms of mechanical system building blocks

A

Spring - associated with stiffness of the system

Damper- exhibits force which opposes motion

Mass- offers inertia / resistance to acceleration.

28
Q

What are the specific tasks a mass,Spring and damper perform in a mechanical system

A

Spring - energy storage device
Mass- energy storage device
Damper - energy dissipation device

29
Q

What is a hydraulic and pneumatic fluid system

A

Hydraulic - liquid is deemed incompressible

Pneumatic - gas which is compressible and exhibited a change in density

30
Q

Hydraulic resistance

A

Due to resistance of flow through valves or change in pipe diameter

31
Q

Hydraulic capacitance

A

Associated with energy storage of a liquid in the form of PE

32
Q

Hydraulic inertia

A

Equivalent to a Spring in a mechanical system

33
Q

Transient response

A

Occurs as a result of change in the system input and dies away after a short interval of time

34
Q

Steady state response

A

Remains after all transient responses have died down completely

35
Q 
Draw the graph for the typical input signals to a control system 
Step 
Impulse 
Ramp input 
Sinusoidal
A

|

/

Sin wave

36
Q

Draw the graph for a first order system subject to a step input

A

Slow increase in cure which levels out

37
Q 
Draw the graphs for the response of second order systems to a step input 
Step input 
No damping 
Some damping 
High camping
A

Look at notes

38
Q

What is rise time (performance measures for second order systems )

A

The time taken for the response @0 to rise from 0 to the the steady state value and is a measure of how fast a system responds to an input.

39
Q

What is peak time (performance measures for second order systems )

A

Is the time taken for the response to rise from 0 to the first peak value

Time taken for the oscillatory response to complete a half cycle

40
Q

What is overshoot (performance measures for second order systems )

A

The maximum amount by which the response overshoot @ss

41
Q

What is Settling time (performance measures for second order systems )

A

A measure of time taken for the oscillations to die away

42
Q

Open loop (control strategies)

A

On-off switching or timed switching sequence or action

43
Q

Closed loop (control strategies)

A

Often a two step mode control, proportional control or proportional combined with other features

44
Q

Two step mode control

A

The error input signal to the control element results in on/off output which is used to switch the correct element on or off

45
Q

Proportional control

A

Output from the control element is a signal which is proportional to the error

46
Q

Derivative control

A

The output is proportional to the rate of change of the error signal

47
Q

Integral control

A

The output at time t is proportional to the integral of the error signal

48
Q

Three term controller

A

A proportional plus integral plus derivative

Instrumentation And Control (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions