Dynamic System Modelling and Control Unit code: ENEM14015

Term 3, 2017

Laboratory Workbook-3

Whirling of shaft

Student Name: HIMANSHU

Student ID: 12061957

Week

of Submission: Week-8

Date

of Submission: 13/1/2018

School

of Engineering and Technology

Central

Queensland University

Executive summary: This lab report

is based on the whirling of shaft to observe the resonance condition. This

experiment will manifest the first, second and third whirling vibrations modes.

The first whirl speed is placed at the mid-span and can be determined by the

whirl speed equations.

Results

:

Table

1 : Results

Shaft

Whirl mode

Measured Speed

(rpm),

Theory

Calculations(rpm)

3mm x 800mm

(baring seperation)

1

912

575

2

2955

2290

3

5237

5142.5

6mm x 800mm

(baring seperation)

1

1433

1163

2

4490

4575

3mm x 450mm

(baring seperation)

(use 600mm long

shaft)

1

2115

2273.2

6mm x 450mm

(baring seperation)

(use 600mm long

shaft)

1(no mass)

3320

3670

1(additional 1kg

Mass at midpoint)

885

800

All

formulas used in this experiment

For first whirl mode

(Hz) (rpm)

For second whirl mode

(Hz) (rpm)

For third whirl mode

(Hz) (rpm)

E = young’s

modulus

weight per unit length (N/m)

Mass = Density *Volume

=

* (given)

=

Then weight multiply by

centre of gravity(g)

Now

weight per unit length

Calculations

For diameter = 3mm, L = 800mm (bearing suspension)

=

N1 = 570 rpm

N2 = 2280 rpm

N3 = 5145.5

rpm

For diameter = 3mm, L = 450mm

N1 = 1785 rpm

For diameter = 6mm, L = 800mm

N1 = 1140 rpm

N2 = 4575 rpm

For diameter = 6mm, L = 450mm as per the formula we get

N1 = 3610 rpm

Discussion:

In this experiment we used whirling shaft test

unit GUNT TM625 and other various accessories is used. In the above

calculations we measured speed and theory calculations for all the whirl modes

with various lengths and diameters. It found that there is not much difference

in the both the measured and theoretical calculations. The speed of the

whirling shows increases and decreases with different length and diameters.

Conclusion: This lab report

gives the experimental results for the laboratory with different three types of

whirl modes.

Dynamic System Modelling and Control Unit code: ENEM14015

Term 3, 2017

Laboratory Workbook-3

Whirling of shaft

Student Name: HIMANSHU

Student ID: 12061957

Week

of Submission: Week-8

Date

of Submission: 13/1/2018

School

of Engineering and Technology

Central

Queensland University

Executive summary: This lab report

is based on the whirling of shaft to observe the resonance condition. This

experiment will manifest the first, second and third whirling vibrations modes.

The first whirl speed is placed at the mid-span and can be determined by the

whirl speed equations.

Results

:

Table

1 : Results

Shaft

Whirl mode

Measured Speed

(rpm),

Theory

Calculations(rpm)

3mm x 800mm

(baring seperation)

1

912

575

2

2955

2290

3

5237

5142.5

6mm x 800mm

(baring seperation)

1

1433

1163

2

4490

4575

3mm x 450mm

(baring seperation)

(use 600mm long

shaft)

1

2115

2273.2

6mm x 450mm

(baring seperation)

(use 600mm long

shaft)

1(no mass)

3320

3670

1(additional 1kg

Mass at midpoint)

885

800

All

formulas used in this experiment

For first whirl mode

(Hz) (rpm)

For second whirl mode

(Hz) (rpm)

For third whirl mode

(Hz) (rpm)

E = young’s

modulus

weight per unit length (N/m)

Mass = Density *Volume

=

* (given)

=

Then weight multiply by

centre of gravity(g)

Now

weight per unit length

Calculations

For diameter = 3mm, L = 800mm (bearing suspension)

=

N1 = 570 rpm

N2 = 2280 rpm

N3 = 5145.5

rpm

For diameter = 3mm, L = 450mm

N1 = 1785 rpm

For diameter = 6mm, L = 800mm

N1 = 1140 rpm

N2 = 4575 rpm

For diameter = 6mm, L = 450mm as per the formula we get

N1 = 3610 rpm

Discussion:

In this experiment we used whirling shaft test

unit GUNT TM625 and other various accessories is used. In the above

calculations we measured speed and theory calculations for all the whirl modes

with various lengths and diameters. It found that there is not much difference

in the both the measured and theoretical calculations. The speed of the

whirling shows increases and decreases with different length and diameters.

Conclusion: This lab report

gives the experimental results for the laboratory with different three types of

whirl modes.