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Active and Semi Active Suspension Systems

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Bhalaji Sadagopa Ramanujam

on 27 November 2013

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Transcript of Active and Semi Active Suspension Systems

Control System

Active and Semi-active Suspension Systems
Conclusion and future scope
Used on coaches
Control Pitch
Control roll: Stability while cornering
Adaptive to Road conditions
Different Driving modes
Leather Springs
Invented in 1665
Elliptical Springs
Patented by Obadiah
Elliot in 1804
Rubber tires - 1795
Hydraulic Shock
Invented in 1919
Balloon tires - Invented in 1925
Conventional spring
Control Programming Unit
Shock Absorber
Solenoid / Valve Actuated
Magneto Rheological Damper

1. Expensive

2. Future proof?
Other technologies
1. Bose Suspension
2. Michelin Active wheel
Design of Suspension Systems
Types of Semi-active Suspension Systems
Active Electromagnetic Suspension System
Active Hydraulic Suspension System
Active Suspension System
Passive and Active Suspension Comparison
Source: www.prelinger.com
Source: www.prelinger.com
Quarter Car Model
Source: www.johnlund.com
Source: www.prelinger.com
Source: www.prelinger.com
Source: S. Lajqi and S. Pehan. Designs and optimizations of active and semi-active non-linear suspension systems for a terrain vehicle.
History & Introduction
Semi-active Suspension Systen
source: home.comcast.net
source: strutpatent.com
Source: xdesktopwallpapers.com
Source: www.autohouston.net
Scource: www.automobilemag.com
Source: www.bmwblog.com
Source: www.popsci.com
Source: www.motorauthority.com
Orifice based Semi-active Suspension System
MR Fluid based Semi-active Suspension System
Job of suspension system:
1) Maximize friction
2) Steering stability
3) Comfort
Idea of springs
Invention of wheel
Approx. 5200 years ago
Passive Suspension
Active Suspension
Semi-active Suspension
Passive Suspension System
Source: Generalized PI Control of Active Vehicle Suspension Systems with MATLAB, By Esteban Chávez Conde, Francisco Beltrán Carbajal Antonio Valderrábano González and Ramón Chávez Bracamontes

Source: On the Control Aspects of Semiactive Suspensions for Automobile Applications, By Emmanuel D. Blanchard
Source: On the Control Aspects of Semiactive Suspensions for Automobile Applications, By Emmanuel D. Blanchard
Source: Passive, Semi-Active and Active Suspension System, by Dr. Hudha
Active suspension equation

Basic equation of sprung mass and unsprung mass

Acceleration of Sprung Mass for Passive and Active Suspensions
It consists of a mass connected by either springs or fluid.
The motion of the mass due to g-forces generates a signal

The Hydraulic active suspension has a reservoir, a pump, a spool valve and a piston
The spool valve is controlled by the actuator. It adjusts the damping of the Hydraulic fluid according to the requirement
The active counter force applied by the hydraulic fluid on the piston is
F=P pump*A
Where P pump =pump pressure and A= area
Hydraulic active suspension system
The electromagnetic active suspension consists of a permanent magnet shaft placed inside a stator with coil windings.
The coil windings are connected to a three phase power supply and vary the magnetic field according to the control signal
The principle of operation is similar to a PMS Motor and can be used for power regeneration
It can be used in conjunction with a damping fluid.
The force of attraction follows inverse square law where F=(B1*B2 *K)/r2

Electromagnetic Active Suspension

A Solenoid Valve Semi Active suspension utilizes solenoid activated valves to control flow of the fluid in dampers
The solenoid is a wound wiring which produces magnetic field when current is passed through it
The equation of flux inside the coil is given by
When more damping is required the valves are closed tightly and vice versa.

Solenoid Valve Semi Active Suspension

Are colloidal dispersions of single domain ferromagnetic particles .
The magnetic particles when exposed to a magnetic field couple and enclose some of the base fluids with them
As most magnetic particles are insoluble in liquids sometimes a compound is added which combines both the particles and the fluid by forming a sheath. Eg. Oleic acid first used by Papell
The ratio of sheath thickness to diameter is usually 0.2

Magneto Rheological Damper
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