PERFORMANCE TEST OF A SHOCK ABSORBER - Computer Programming

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## Wednesday, March 30, 2011

PERFORMANCE TEST OF A SHOCK ABSORBER

AIM :

To study the characteristics of a shock absorber.

APPARATUS REQUIRED :

Shock absorber test rig

OBJECTS OF THE SUSPENSION ARE :

1. To prevent road shocks from being transmitted to the vehicle components.
2. To safeguard the occupants from road shocks.
3. To preserve the stability of the vehicle in pitching or rolling in motion.

MAIN FUNCTIONS OF SHOCK ABSORBERS :

1. To control quick bouncing of wheels on road surface.
2. To control slow bouncing of the body on the suspension springs.

DESIGN CALCULATION :

1. Diameter of the piston (dp)
Piston of diameter, dp =                     mm.

1. Diameter of the rod (dr)
The diameter of the rod, dr   = 0.4 * dp

1. Outer diameter of shock absorber (D) (Dust cover)
Diameter (D) =                        mm.

1. Determination of design compression force (Fc)
Compression force, Fc = [Ap – Ar]* Pc
= π/4[dp2 – dr2]*Pc
Ap- Area of piston in m2
Ar- Area of rod in m2
Pc- Pressure transmitted through shock absorber during compression in N/m2 (0.05 to 0.25 MPa)
1. Determination of design rebound force (Fr)
rebound force, Fr = Ap* Pr
= π/4[dp2]*Pr
Pr - Pressure transmitted through shock absorber during rebound in N/m2 (0.5 to 1 MPa)

1. Determination of damping coefficient:

Compression
Kc   =                                        N-s/m

µ- Flow co – efficient
υ- Density of fluid in (9000) N/m3

RESULT:
Thus the characteristic of a shock absorber has been studied.