Semi Active Vibration Control of Quarter Car

Model Using Magnetorheological Fluid

Damper

Introduction

• Types of suspension system

1. Passive System

2. Active System

3. Semi-Active System

What is MR Fluid?

• Fluid suspended with ferrous particles

• Damping force is proportional to the applied magnetic

field

• Same efficiency as that of active system consuming less

power

Methodology

• Quarter car modeling

• Where m1= 250 kg, m2 = 1300 kg, K = 650000 N/m, C =

800 Ns/m, k = 110000 N/m

• To calculate Frh:

1. Conventional Damper

Where c = 6000 Ns/m

2. MR damper

For calculating the damping force exerted by MR damper

we have used Bouc Wen Model

c0 =5300 Ns/m,

c1 = 93000 Ns/m,

k0 = 1400 N/m,

k1 = 540 N/m,

α = 96300 N/m, β = 2000000 m-2,

γ = 2000000 m-2,

n = 2,

δ = 207,

x0 = 0

Conventional System Simulink Model

MR Damper Simulink Model

Results of Simulation

Sprung Mass Displacement

Conventional MR Damper

Sprung Mass Velocity

Conventional MR Damper

Unsprung Mass Displacement

Conventional MR Damper

Unsprung Mass Velocity

Conventional MR Damper

Conclusion

• This paper presents a new approach of controlling the

response of a quarter car vehicle model traversing a

rough road with semi-active MR damper suspensions.

• The MR damper performance is sought to be better as

compared to the conventional passive damper system.

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