Landing Gear
Landing Gear
(OP)
how to calculate the landing gear damping coefficient and stiffness for a non linear Spring type.
I have only the mass of helicopter = 5126 Kg
and initial velocity of 0.5m/s .
Can anybody help please
thanks
I have only the mass of helicopter = 5126 Kg
and initial velocity of 0.5m/s .
Can anybody help please
thanks





RE: Landing Gear
RE: Landing Gear
Mass of the helicopter = 5126 Kg
sink speed = 0.5m
k= F/x = 5126/0.3 = 167620.2 N/m
Need to find out damping ratio and Damping Coeficient at which the helicopter will have a deflection of 0.3 m
RE: Landing Gear
but damping controls how the systems responds to step changes over time ... does it bounce ?
which'll require other data
RE: Landing Gear
and it should bounce because its landing on a aircraft carrier. we have to assume the time
thanks
RE: Landing Gear
Do you mean it should NOT bounce?
RE: Landing Gear
but i wonder if that's the right force to apply (btw, there are two skids supporting the helicopter, so each supports 1/2 the weight)
maybe an energy equation, the initial kinetic and potential energy are converted into spring energy
1/2mv^2+mgh = 1/2kx^2 ... (h = x ??)
... but i don't think that's the right spring energy ... it's not like there's a spring mounted under the fuselage, being compressed; it's more like a leaf spring.
RE: Landing Gear
the landing gear system is a tricycle type.
RE: Landing Gear
still the reasonable assumption would be landing on the two main gear.
this is starting to sound suspiciously like a school problem ...
RE: Landing Gear
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Landing Gear
OK, is the load split between all three legs?
Secondly, what is the complete list of your design aims? I gather maximum deflection of 0.3m is one. Or are you saying the spring deflection at rest is 0.3m?
If you don't have any damping then the helicopter will land, compress the spring, and then bounce back into the air.
"k= F/x = 5126/0.3 = 167620.2 N/m"
wrong. Or at least, if it happens to be right it'll be because of coincidence not logic.
Cheers
Greg Locock
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