Cylinder-driven hopper flap: which shock absorber?

100 kg flap driven by a 1 000 N cylinder. Watch the 40-second explainer, check the calculation, then open the same example in ImpactCal and change it to your own machine.

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Inputs (SI units)

Mass m	100 kg
Velocity v	1.0 m/s
Force F	1 000 N
Force radius r	0.5 m
Absorber radius R	0.8 m
Cycles C	200 /h

Calculation

Kinetic energyE1 = m·v²/6 = 100·1.0²/6	16.7 J
Drive energyE2 = F·(r / R)·s = 1 000·(0.5 / 0.8)·0.050	31.3 J
Energy per cycleE3 = E1 + E2	47.9 J
Energy per hourE4 = E3·C = 47.9·200	9 583 J/h
Effective massme = 2·E3 / v²	95.8 kg

s = stroke of the selected model · g = 9.81 m/s²

ImpactCal selection

AC-20-50

Smallest · best-centred

Stroke50 mm

Stopping force1.20 kN

Deceleration12.5 m/s²

Stopping time0.125 s

Open this example in ImpactCalSize my own application