VIBRATION ISOLATION USING PERMANENT MAGNETS

Guide: Mr. V.P.M Baskaralal

Project Members: Swishy P JohnSyed Abdul KhaderSyed Shahabuddin

ABSTRACT To absorb vibrations on the Top plate of

suspension system from Base excitation

Magnetic Levitation One DOF Two DOF

SUSPENSION SYSTEM - TYPESDepending upon the purpose, the suspension systems are classified as

Active suspension system Semi Active suspension system Passive suspension system

CAR MODELS (SUSPENSION) Full car model Half car model Quarter car model

MAGNETIC LEVITATION Magnetic levitation is a principle by

which an object is suspended with no support other than fields.

Magnetic materials and systems are able to attract or press each other apart or together with a force dependent on the magnetic field and the area of the magnets.

MAGNET USEDNEODYMIUM MAGNET Neodymium magnets are the powerful

magnets Grades range from N35 to N52

depending on their magnetic property. The magnetic flux of neodymium

magnet N35 is 3.3 tesla.

EXPERIMENTAL DETAILS

VIBRATION EXCITER Vibration Exciter is the machine used to

excite an object depending upon the Frequency inputted

PIEZO-ELECTRIC ACCELEROMETER Piezoelectric accelerometers convert

Acceleration into Electrical Signals and provide an electrical signal

Sensitivity of the accelerometer is the ratio of the sensor's electrical output to mechanical input

DEWESOFT SOFTWARE Operating Software Displacement

- Displacement vs Time Acceleration

- Acceleration vs Time

APPARATUS One DOF

- With Magnet- Without Magnet

Two DOF- With Magnet- Without Magnet

EXPERIMENTAL SETUP

- One Degree of Freedom- Two Degrees of Freedom

EXPERIMENTAL PROCEDURE

\ Setup diagram of Exciter with

the PC

OBSERVATIONS

DISPLACEMENT One DOF

- With Magnet- Without Magnet

Two DOF- With Magnet- Without Magnet

ACCELERATION One DOF

- With Magnet- Without Magnet

Two DOF- With Magnet- Without Magnet

MODAL ANALYSIS OF 1 DOF WITHOUT MAGNET

MODAL ANALYSIS OF 1 DOF WITH MAGNET

MODAL ANALYSIS OF 2 DOF WITHOUT MAGNET

MODAL ANALYSIS OF 2 DOF WITH MAGNET

CALCULATIONS

RESULT

DISPLACEMENT 1 DOF - without magnet

5 7 9 11 13 15 17 190

0.02

0.04

0.06

0.08

0.1

0.12

Bottom PlateTop Plate

5 7 9 11 13 15 17 19

Bottom Plate 0.0757 0.0288 0.0358 0.0325 0.0189 0.0345 0.1047 0.0387

Top Plate 0.037 0.0105 0.0097 0.0098 0.0134 0.0184 0.0198 0.0105

Frequency (Hz)

DISPLACEMENT 1 DOF - with magnet

5 7 9 11 13 15 17 190

0.01

0.02

0.03

0.04

0.05

0.06

Botttom PlateTop Plate

5 7 9 11 13 15 17 19

Botttom Plate 0.0538 0.0449 0.0369 0.0288 0.0289 0.0289 0.0196 0.0338

Top Plate 0.0088 0.0056 0.005 0.0057 0.0048 0.0047 0.0041 0.0066

Frequency (Hz)

DISPLACEMENT 2 DOF - without magnet

5 7 9 11 13 15 17 190

0.01

0.02

0.03

0.04

0.05

0.06

0.07

Bottom PlateTop Plate

5 7 9 11 13 15 17 19

Bottom Plate 0.0589 0.0454 0.0325 0.031 0.0248 0.0193 0.0311 0.033

Top Plate 0.0131 0.0095 0.0067 0.0065 0.0067 0.0068 0.0064 0.007

Frequency (Hz)

DISPLACEMENT 2 DOF - with magnet

5 7 9 11 13 15 17 190

0.02

0.04

0.06

0.08

0.1

0.12

Bottom PlateTop Plate

5 7 9 11 13 15 17 19

Bottom Plate 0.0372 0.109 0.0286 0.0412 0.0347 0.0306 0.0342 0.0356

Top Plate 0.0081 0.0041 0.0015 0.0024 0.0026 0.0028 0.0015 0.0014

Frequency (Hz)

ACCELERATION 1 DOF-WITHOUT MAGNET

5 7 9 11 13 15 17 190

2

4

6

8

10

12

14

16

Bottom PlateTop Plate

5 7 9 11 13 15 17 19

Bottom Plate 5.2993 4.4423 2.722 3.2805 1.7286 1.7994 13.784 1.3659

Top Plate 1.99 0.543 0.4169 1.2367 0.6433 0.8125 1.8882 0.5197

Frequency (Hz)

ACCELERATION 1 DOF-WITH MAGNET

5 7 9 11 13 15 17 19

Bottom Plate 3.0599 3.6276 2.9755 3.4351 2.5398 1.3418 3.0167 1.3336

Top Plate 0.4395 0.3119 0.2485 0.2425 0.2209 0.2556 0.2546 0.2802

5 7 9 11 13 15 17 190

0.5

1

1.5

2

2.5

3

3.5

4

Bottom PlateTop Plate

Frequency (Hz)

ACCELERATION 2 DOF-WITHOUT MAGNET

5 7 9 11 13 15 17 190

0.5

1

1.5

2

2.5

3

3.5

Bottom plateTop Plate

5 7 9 11 13 15 17 19

Bottom plate 2.0496 1.8134 2.9384 3.3318 1.3491 2.3186 1.5946 1.3523

Top Plate 0.5406 0.4179 0.2492 0.5016 0.4878 0.5926 0.5413 0.4172

Frequency (Hz)

ACCELERATION 2 DOF-WITH MAGNET

5 7 9 11 13 15 17 190

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

Bottom PlateTop Plate

5 7 9 11 13 15 17 19

Bottom Plate 2.195 4.6478 1.7427 3.1173 2.9407 2.8708 1.3102 1.4027

Top Plate 0.263 0.3067 0.1933 0.2346 0.2096 0.2082 0.1464 0.1921

Frequency (Hz)

5 7 9 11 13 15 17 190

0.005

0.01

0.015

0.02

0.025

0.03

0.035

0.04

Without MagnetWith Magnet

COMPARISON: DISPLACEMENT 1 DOF with and without magnet

5 7 9 11 13 15 17 19Without Magnet 0.037 0.0288 0.0097 0.0098 0.0134 0.0184 0.0198 0.0105With Magnet 0.0088 0.0056 0.005 0.0057 0.0048 0.0047 0.0041 0.0066

Result- Displacement 1 DOF with and without magnet

Frequency (Hz)

COMPARISON: DISPLACEMENT 2 DOF WITH AND WITHOUT MAGNET

5 7 9 11 13 15 17 190

0.002

0.004

0.006

0.008

0.01

0.012

0.014

Without MagnetWith Magnet

5 7 9 11 13 15 17 19Without Magnet 0.0131 0.0095 0.0067 0.0065 0.0067 0.0068 0.0064 0.007With Magnet 0.0081 0.0041 0.0015 0.0024 0.0026 0.0028 0.0015 0.0014

Result - Displacement 2 DOF with and without magnetFrequency (Hz)

COMPARISON: ACCELERATION 1 DOF WITH AND WITHOUT MAGNET

5 7 9 11 13 15 17 190

0.5

1

1.5

2

2.5

Without MagnetWith Magnet

5 7 9 11 13 15 17 19Without Magnet 1.99 0.543 0.4169 1.2367 0.6433 0.8125 1.8882 0.5197With Magnet 0.4395 0.3119 0.2485 0.2425 0.2209 0.2556 0.2546 0.2802

Result – Acceleration 1 DOF with and without magnet

Frequency (Hz)

COMPARISON: ACCELERATION 2 DOF WITH AND WITHOUT MAGNET

5 7 9 11 13 15 17 190

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Without MagnetWith Magnet

5 7 9 11 13 15 17 19Without Magnet 0.5406 0.4179 0.2492 0.5016 0.4878 0.5926 0.5413 0.4172With Magnet 0.263 0.3067 0.1933 0.2346 0.2096 0.2082 0.1464 0.1921

Result – Acceleration 2 DOF with and without magnet

Frequency (Hz)

CONCLUSION 

From the experiment it is observed that there is reduction in the displacement and acceleration values while performing experiment using magnets.

While comparing the values of experiment without magnet and the experiment with magnet, there is a difference in the values obtained.

Hence, Magnet acts as powerful shock absorber as it absorbs huge amount of shock and reduces vibrations getting transferred from bottom to the top plate.

ADVANTAGES Magnetic suspensions are cheap to construct. For commercial purpose this can be constructed at much

cheaper rates than conventional suspension systems used these days.

It is easy to construct as it does not involve any complex mechanism which could be very useful during repairs.

FURTHER DEVELOPMENTThis project can be further developed using different types of combinations such as using Multi Degrees of Freedom system, spring –Magnet- Damper combinations and using various powerful magnets which could absorb more vibration and act as powerful shock absorbing device to enable more comfort and safety to the passengers. Magnetic suspensions are still in developmental stage and can play important role in the future automobile suspension systems.