Semi-Active Vibration Control of a Quarter Car Model Using MR Damperishan kossambe
This presentation analytically evaluates the dynamic response of a quarter car using semi active control system. Semi active control system are becoming popular because they provide with good reliability like passive system and consume less power to give better performance than the active system. Magnetorheological (MR) fluid can produce good controllable damping force under the application of magnetic field and hence can be used as effective element in semiactive vibration control.
Out of the various semi active control strategies, the Bouc-Wen model control strategy is used in this work. Response of the quarter car is measured using MR damper and compared with normal passive damper.
Vibration Controller | Electrodynamic Vibration Systemsdyn India
Sdyn’s Vibration Controllers are tailored in 4/8/16 channel configuration to bring users the most advanced and complete range of vibration testing solutions. Our Vibration Controllers are compatible with any make of amplifier and shaker combination available worldwide.
http://sdyn.in/
Active vibration control of composite structure by PZT and PVDF concludes that, in the first mode i.e., 21Hz at 160V, for 0.133N force, % of reduction in vibration by PZT is 18%. For the second mode i.e., 106.8Hz at 196V, for 0.035N, %of reduction in vibration by PZT is 48%. As the voltage increases, there will be more control in vibration.
In the first mode i.e., 23.5Hz at 150V, for 0.1N, %of reduction in vibration by PVDF is 3% and for the second mode i.e., 106.5Hz at 370V, for 0.033N, % of reduction in vibration by PVDF is 7%. As the voltage increases there is a reduction in vibration.
PVDF which is light weight in nature, its stiffness is less compared to PZT. In this case voltage is varied. In future work, multiple PVDF’s can utilize for the vibration control by increasing the voltage as well as force.
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This sharing will focus on the general introduction of IMU components, signal characteristics and application concepts, with an attempt to guide those who is interested in the IMU-based system integration and algorithm development.
Semi-Active Vibration Control of a Quarter Car Model Using MR Damperishan kossambe
This presentation analytically evaluates the dynamic response of a quarter car using semi active control system. Semi active control system are becoming popular because they provide with good reliability like passive system and consume less power to give better performance than the active system. Magnetorheological (MR) fluid can produce good controllable damping force under the application of magnetic field and hence can be used as effective element in semiactive vibration control.
Out of the various semi active control strategies, the Bouc-Wen model control strategy is used in this work. Response of the quarter car is measured using MR damper and compared with normal passive damper.
Vibration Controller | Electrodynamic Vibration Systemsdyn India
Sdyn’s Vibration Controllers are tailored in 4/8/16 channel configuration to bring users the most advanced and complete range of vibration testing solutions. Our Vibration Controllers are compatible with any make of amplifier and shaker combination available worldwide.
http://sdyn.in/
Active vibration control of composite structure by PZT and PVDF concludes that, in the first mode i.e., 21Hz at 160V, for 0.133N force, % of reduction in vibration by PZT is 18%. For the second mode i.e., 106.8Hz at 196V, for 0.035N, %of reduction in vibration by PZT is 48%. As the voltage increases, there will be more control in vibration.
In the first mode i.e., 23.5Hz at 150V, for 0.1N, %of reduction in vibration by PVDF is 3% and for the second mode i.e., 106.5Hz at 370V, for 0.033N, % of reduction in vibration by PVDF is 7%. As the voltage increases there is a reduction in vibration.
PVDF which is light weight in nature, its stiffness is less compared to PZT. In this case voltage is varied. In future work, multiple PVDF’s can utilize for the vibration control by increasing the voltage as well as force.
IMU (inertial measurement unit) has already played significant roles in the control system of aerospace and other vehicle platforms. Due to the maturity and low cost of MEMS technology, IMU starts to penetrate consumer products such as smartphone, wearables and VR/AR devices.
This sharing will focus on the general introduction of IMU components, signal characteristics and application concepts, with an attempt to guide those who is interested in the IMU-based system integration and algorithm development.
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Modelling and simulation of SAS system with MR damper Dimuthu Dharshana
1. Mathematical Modeling and
Simulation of SAS System With
Magnetorheological (MR) Damper
MA417
Mathematics
for
Mechatronics
University of Agder-Spring 2013
Oreste Niyonsaba
Dimuthu Dharshana Arachchige
Subodha Tharangi Ireshika
Slide 1
3. Vibration Isolation
• In most mechanical systems the excess
energy that is created becomes vibration
• Vibration leads to
•
•
•
•
•
•
excessive wear of bearings
formation of cracks
loosening of fasteners
structural and mechanical failures
frequent and costly maintenance of machines
discomfort to humans
• A vibration isolation system is needed to
reduce vibrations
Slide 3
4. Isolation systems
Passive:
• No need of
external power
source
• Simple,
inexpensive and
reliable isolation
• Inherent
performance
limitations
Semi-active:
• Excellent
compromise
between passive
and active
systems
• Require low
power for signal
processing
• Improved
vibration
isolation
Active:
• Control forces
change with
excitation and
response
characteristics
• Need of external
energy source
• Can supply and
dissipate energy
Slide 4
5. Magneto-Rheological (MR Dampers)
MR Fluid
MR fluid is composed of oil and varying percentages of iron particles that
have been coated with an anti-coagulant material
Without Magnetic field
With Magnetic field
Slide 5
6. Modes of operation of MR fluid
a.Valve mode
b.Shear mode
c.Squeeze mode
Slide 6
7. MR Rotary damper and SAS test rig.
active MR fluid area
output axis
magnetic circuit(rotor)
magnetic circuit(stator)
coil
magnetic flux line
Viscosity is changed due to the generated magnetic field of
the coil, affecting to control the torque of the output axis
Semi Active Suspension (SAS)
system with MR rotary brake
Slide 7
8. Mathematical modeling of the
SAS system
Analysis of the upper beam
Analysis of the lower beam
Slide 8
10. MR Damper models
a. The Bouc-Wen model
x
Torque (T) generated by the MR damper,
θ
γ=1, β=737,δ=843, n=1.9,
C1=0.0015, C2=17, α1=1,α2=17 [9]
Slide 10
16. Dhal model
T
z
K x (i) K y (i) z
(
Kx
K a Kb i
Ky
K1 K 2 i
z)
T : exerted torque of the MR brake
θ : angle
i : control current
z : dynamic hysteresis coefficient
Kx ,Ky, α: parameters which controls the
shape of the hysteric.
K1 5, K 2 1.5, K a 0.001, K b 0.001,
Slide 16
5
20. Effect of MR damper parameters on the
vibration response
Vibration Response Vs Time for different K1 values (i=1)
50
K1=0
K1=5
K1=7
Vibration Response (Degrees))
45
40
35
30
25
20
Ka=0.001
Ka=0
Ka=10
15
Time (s)
20
25
30
Alpha=0
Alpha=5
Alpha=7
45
Vibration Response (Degrees))
Vibration Response (Degrees))
10
50
40
35
30
40
35
30
25
25
20
5
Vibration Response Vs Time for different Alpha values (i=1)
Vibration Response Vs Time for different Ka values(i=1)
50
45
0
20
0
5
10
15
Time (s)
20
25
30
0
5
10
15
Time (s)
20
25
30
Slide 20
21. Experimental task for hysteresis
measurement
Torque from the MR damper,
M MR
d 1
dt
d 2
dt
d2 2
J2
dt 2
M MR
d 1
dt
d 2
dt
d2 2
J2
dt 2
d 2
k2
dt
M spring
r2 k s los
RG2 cos
k2
d 2
dt
(r2 sin
2
RG2 cos
2
r1 sin
1
2
)2
r1 cos
1
r2 cos
2
Slide 21
23. Comparison: experiment and computer
simulations
b. Dhal
Displacement Vs Time(i=0.25)
Displacement Vs Time(i=1)
50
50
Theoritical
Experiment
45
40
Displacement (Degrees)
Displacement (Degrees)
45
35
30
25
20
15
Theoritical
Experiment
40
35
30
25
20
0
5
10
15
Time (s)
20
25
15
0
5
10
15
20
Time (s)
Slide 23
25
24. Conclusion
• Easy to analyze MR damper with SAS test rig which
supports Matlab Simulink environment.
• Both theoretical and experimental models, magnitude of
torque in hysteresis behavior lies in a common range.
• If model parameters are diligently tuned, a similar vibration
response can be obtained for both theoretical and
experimental models.
• Bouc-Wen model stands taller as far as the more realistic,
accurate results are concerned.
• Semi-active dampers provide remarkable improvements
over passive suspensions.
Slide 24