**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 :**

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

**MAIN FUNCTIONS OF SHOCK ABSORBERS**:

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

**DESIGN CALCULATION :**

- Diameter of the piston (dp)

Piston of diameter, dp = mm.

- Diameter of the rod (dr)

The diameter of the rod, dr = 0.4 * dp

- Outer diameter of shock absorber (D) (Dust cover)

Diameter (D) = mm.

- Determination of design compression force (Fc)

Compression force, Fc = [Ap – Ar]* Pc

= π/4[dp

^{2}– dr^{2}]*PcA

_{p}- Area of piston in m^{2}A

_{r}- Area of rod in m^{2}P

_{c- }Pressure transmitted through shock absorber during compression in N/m^{2}(0.05 to 0.25 MPa)- Determination of design rebound force (Fr)

rebound force, Fr = Ap* Pr

= π/4[dp^{2}]*Pr

P

_{r}- Pressure transmitted through shock absorber during rebound in N/m^{2 }(0.5 to 1 MPa)

Determination of damping coefficient:

Compression

Kc = N-s/m

µ- Flow co – efficient

υ- Density of fluid in (9000) N/m

^{3}**RESULT:**

**Thus the characteristic of a shock absorber has been studied.**

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