17-11-2012, 01:54 PM
Hydrogas Suspension System for AFV
Hydrogas Suspension System for AFV.pptx (Size: 4.13 MB / Downloads: 83)
Introduction-
AFV-Armored Fighting Vehicle
Tracked Vehicle
Hydro gas Suspension- Gas is used to act as a spring medium instead of material torsional spring.
HGS is combination of three basic sub systems viz. hydraulic, gaseous and mechanical kinematics
Hydrogas is the evolution of Hydroelastic
History
1917 Great War- fixed suspensions—with no movement whatsoever.
This was improved with leaf spring suspensions.
1930 the Christie suspension was developed, which allowed the use of coil springs.
1942 the Second World War the other common type was torsion-bar suspension.
1973 Hydrogas suspension system is Invented by famous British automotive engineer Alex Moulton.
OBJECTIVES OF AFV SUSPENSIONS
The tire force should be limited.
The suspension workspace is restricted to stop large deflection of suspension.
Axle vibrations are reduced.
The suspension should be adaptable to ensure uniform performance under varying load conditions.
WORKING OF HGS-
The track drags up the vehicle.
The suspension road wheels rotate.
When the vehicle comes in contact with an obstacle.
The road wheel along with the axle arm swings up.
The kinematic arrangement results in the displacement of the filled in hydraulic oil.
This fluid compresses the accumulator piston against
the entrapped nitrogen gas.
Raising the pressure of the gas to offer sufficient load.
After crossing the obstacle, the compressed gas expands and the pressure reduces so that the increased load is reduced to the static load.
Advantages-:
Non linear spring rate.
Provides more stable Gun platform.
Offer smoother ride quality.
Loss of weight due to replacement of conventional steel spring.
Replacement of a suspension sphere is much easier and safer than replacing a conventional spring.
Disadvantages-:
Service sometimes requires a specifically trained mechanic.
expensive to repair or replace
Failure will cause a drop in ride height and braking power will decrease.