ME 392 Chapter 5 Spin Balancing February 21, 2012 week 7 part 2

ME 392Chapter 5

Spin Balancing

February 21, 2012week 7 part 2

Joseph Vignola

Approach to Lab MeasurementsIn the first lab basic approach I like to use for experiments

Approach to Lab MeasurementsIn the first lab basic approach I like to use for experiments

All measurements parameters defined as LabVIEW controls and passed into a data file along with the data.

Approach to Lab MeasurementsIn the first lab basic approach I like to use for experiments

All measurements parameters defined as LabVIEW controls and passed into a data file along with the data.

Approach to Lab MeasurementsIn the first lab basic approach I like to use for experiments

All measurements parameters defined as LabVIEW controls and passed into a data file along with the data.

Approach to Lab MeasurementsIn the first lab basic approach I like to use for experiments

All measurements parameters defined as LabVIEW controls and passed into a data file along with the data.

Literal file and variable names

“sampling_frequency”“accelerometer_data”“iteration_number”

“smith_lab1_filter.vi”“smith_lab1_filter.m”“smith_lab1_data.mat”

Approach to Lab MeasurementsIn the first lab basic approach I like to use for experiments

All measurements parameters defined as LabVIEW controls and passed into a data file along with the data.

Literal file and variable names

Fully automated Matlab script for processing, plotting and saving results in final form

Approach to Lab MeasurementsIn the first lab basic approach I like to use for experiments

All measurements parameters defined as LabVIEW controls and passed into a data file along with the data.

Literal file and variable names

Fully automated Matlab script for processing, plotting and saving results in final form

Save unprocessed data in LabVIEW

This WeekAssignment 4 is due Friday, February 24

This WeekAssignment 4 is due Friday, February 24

Lab 2 is due next Friday, March 2

This WeekAssignment 4 is due Friday, February 24

Lab 2 is due next Friday, March 2

In both case you will record accelerometer signals

This WeekAssignment 4 is due Friday, February 24

Lab 2 is due next Friday, March 2

In both case you will record accelerometer signals

The accelerometers have a sensitivity of something like

Assignment 4Your assignment 4 submission should have

1) MS Word file that explains what you did for each part of the assignment

2) One or more LabVIEW VIs that you used for the assignment

3) Several different m-files, one for each part of the problem

You can work with only one other person, list their name in the MS Word file as your lab partner

Each of you should collect and process different data

Lab 2In the second lab you will be asked you reduce imbalance induced vibrations in a spinning disk

Lab ReportsYou should follow the structure used for the first lab report for the next three lab reports

You can’t use any text from lab report 1 unless you wrote it

You must: write all your own textmake your own figurecollect your own data

Lab ReportsYou should follow the structure used for the first lab report for the next three lab reports

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

Time (s)

Vol

tage

(V)

Vibration For Mass at Zero Degrees, Time

100

101

102

103

104

105

0

0.01

0.02

0.03

0.04

0.05

Frequency (Hz)

Am

plitu

de (d

B)

Vibration For Mass at Zero Degrees, Frequency

Make sure your figures are readable

Lab ReportsYou should follow the structure used for the first lab report for the next three lab reports

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

Time (s)

Vol

tage

(V)

Vibration For Mass at Zero Degrees, Time

100

101

102

103

104

105

0

0.01

0.02

0.03

0.04

0.05

Frequency (Hz)

Am

plitu

de (d

B)

Vibration For Mass at Zero Degrees, Frequency

Label axes with physical units like displacement (m) or time (s) rather than voltage (V) Make sure your

figures are readable

Lab ReportsYou should follow the structure used for the first lab report for the next three lab reports

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

Time (s)

Vol

tage

(V)

Vibration For Mass at Zero Degrees, Time

100

101

102

103

104

105

0

0.01

0.02

0.03

0.04

0.05

Frequency (Hz)

Am

plitu

de (d

B)

Vibration For Mass at Zero Degrees, Frequency

Label axes with physical units like displacement (m) or time (s) rather than voltage (V) Make sure your

figures are readable

Lab ReportsYou should follow the structure used for the first lab report for the next three lab reports

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

Time (s)

Vol

tage

(V)

Vibration For Mass at Zero Degrees, Time

100

101

102

103

104

105

0

0.01

0.02

0.03

0.04

0.05

Frequency (Hz)

Am

plitu

de (d

B)

Vibration For Mass at Zero Degrees, Frequency

Label axes with physical units like displacement (m) or time (s) rather than voltage Make sure your

figures are readable

No titles above the plots

Lab ReportsYou should follow the structure used for the first lab report for the next three lab reports

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

Time (s)

Vol

tage

(V)

Vibration For Mass at Zero Degrees, Time

100

101

102

103

104

105

0

0.01

0.02

0.03

0.04

0.05

Frequency (Hz)

Am

plitu

de (d

B)

Vibration For Mass at Zero Degrees, Frequency

Label axes with physical units like displacement (m) or time (s) rather than voltage Make sure your

figures are readable

No titles above the plots

Figure 1. The displacement response of the …

Used numbers captions below the figure

Lab ReportsYou should follow the structure used for the first lab report for the next three lab reports

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

Time (s)

Vol

tage

(V)

Vibration For Mass at Zero Degrees, Time

100

101

102

103

104

105

0

0.01

0.02

0.03

0.04

0.05

Frequency (Hz)

Am

plitu

de (d

B)

Vibration For Mass at Zero Degrees, Frequency

Label axes with physical units like displacement (m) or time (s) rather than voltage Make sure your

figures are readable

No titles above the plots

Figure 1. The displacement response of the …

Used numbers captions below the figure

Lab 2In the second lab you will be asked you reduce imbalance induced vibrations in a spinning disk

Step 1) measure the vibration induced your spinning diskBy measuring the acceleration for the motor frame

AC couple the data and integrate double integrate the data to get displacement.

Calculate the RMS displacement, Ro

Lab 2In the second lab you will be asked you reduce imbalance induced vibrations in a spinning disk

Step 2) make three more measurements with a trial mass at 0°, 120° and 240°

And calculate the RMS displacements, R1, R2 and R3

Lab 2In the second lab you will be asked you reduce imbalance induced vibrations in a spinning disk

Step 3) calculate the imbalance parameters using

Note the separation angle is

Lab 2In the second lab you will be asked you reduce imbalance induced vibrations in a spinning disk

Step 4) using T, the weight of your trial mass and the equation below, calculate a correction mass and angular location

Note used atan2.m Whereru is the radial distance to the correction massrt is the radial distance to the trial masses

Lab 2In the second lab you will be asked you reduce imbalance induced vibrations in a spinning disk

Step 5) Determine the RMS displacement (presumably reduced) with the correction mass.

Note: all five measurements should be made at the same motor speed.

Lab 2In the second lab you will be asked you reduce imbalance induced vibrations in a spinning disk

Step 5) Determine the RMS displacement (presumably reduced) with the correction mass.

Note: all five measurements should be made at the same motor speed.

Punch line statement for the conclusions

How much did the imbalance induced vibration change from step 1 to step 5?