Choosing the Right Shock Absorber for your Application

Four parameters are required to precisely determine the dimensions of QDI shock absorber:

1. Mass to be decelerated m (kg)
2. Impact velocity v (m/s)
3. Propelling or driving force F (N)
4. Number of Impact cycles per hour C (/hr)

Some useful formulas for problem solving:

1. Kinetic energy: E_K = mv²/2
2. Drive energy: E_K = F*S
3. Free fall velocity: v = Ö (2g*h)
4. Pneumatic or hydraulic cylinder driving forces: F = 0.00785*Pd²
5. Maximum shock force (approx.): F_m = 1.2*E_T/S
6. Propelling force generated by electric motors: F= 3000kW/v
7. Total energy absorber per hour: E_TC = E_T*C

Example 1: Horizontal Impact Application Data:

m = 300 kg

v = 1.0 m/s

S = 0.04m

C = 300/hr

Formulas and calculations:

E_K = mv²/2 = (300*1.0²)/2 = 150 Nm

E_T = E_K = 150 Nm

E_TC = E_T*C = 150*300 = 45,000 Nm/hr

Me = 2 E_T/v² = (2*150)/1.0² = 300kg

Choose from sizing diagram: AD3650 is adequate

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