Definition Suspension system a mechanical system of springs and shock absorbers that connect the wheels and axles to the chassis of a wheeled vehicle The Function of suspension system The job of a car ID: 713090
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Slide1
Passive, Semi-Active and Active Suspension SystemSlide2
Definition:
Suspension system: a mechanical system of springs and shock absorbers
that connect the wheels and axles to the chassis of a wheeled vehicleSlide3
The Function of suspension system:
The job of a car
suspension are: - to carry the static weight of the vehicle
- to
maximize the friction between the tires
and
the road surface,
- to
provide steering stability with good
handling (minimize body roll)
- to
ensure the comfort of the
passengers
(ability to smooth out a bumpy road).Slide4
The Function of Spring and Shock Absorber
The Function of Spring:
to absorb shock energy from road bump and convert it into potential energy of spring
The
Function of Shock Absorber:
to
dissipate
shock energy from road bump without causing undue oscillation in the vehicle.Slide5
Classification of Suspension System
Passive
Semi-Active - Orifice Based Damper
- MR fluid based Damper
Active
Slow Active
ActiveFully ActiveSlide6
Passive Suspension
The damping value (Cs) of a passive damper is determined by the total orifice area (the number of hole) in the piston head. Slide7
Orifice based Semi-Active SuspensionSlide8
MR fluid based
Semi-Active SuspensionSlide9
MR Fluid
Magnetorheological
fluid is composed of oil and varying percentages of ferrous particles (20-50
microns in diameter) that
have been coated with an anti-coagulant material
.
Varying the magnetic field strength has the effect of changing the viscosity of the
magnetorheological fluid.Slide10
Force – velocity relationshipSlide11
Active Suspension System
Active
suspension system uses hydraulic actuator to reduce the amount of external power necessary to achieve the desired performance
characteristics and is able to
exert
an independent force on the suspension to improve the riding characteristics.Slide12
Schematic Diagram and Basic
Configuration
of Hydraulically Actuated Active Suspension SystemSlide13Slide14
Pneumatically Actuated Active Suspension System Developed in
Autotronics
Lab - UTeMSlide15Slide16
Active VS Semi-Active
Semi-Active:
Lower implementation costLower power consumptionEasier to control
Simpler design
Easy to install
Disadvantage: damper constraint, the force range is limited, performance is not as good as active systemSlide17
Active VS Semi-Active
Active System:
Wider range of forceNo force-velocity constraintCan achieve better performance (vehicle dynamics)
Disadvantages: power consumption is high, higher weight to power ratio, expensive, major modification should be made before installing active system into the existing vehicle