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JSBSim GroundReactions: Difference between revisions
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*FlightGear runs JSBSim at 120 Hertz. That's fine for the overall FDM, but incredibly slow for a high fidelity gear model. The problem is worse for a higher spring rate gear, use the softest spring rate you can live with. | *FlightGear runs JSBSim at 120 Hertz. That's fine for the overall FDM, but incredibly slow for a high fidelity gear model. The problem is worse for a higher spring rate gear, use the softest spring rate you can live with. | ||
*Spring rate (spring_coeff) is the weight on the gear divided by the gear deflection. You can specify Pounds per foot or Newtons per Meter. Look at photos of the aircraft you are modeling before and after it lands to get an idea about how far the gears compress. Multiplying gear/compression-ft by the spring rate will tell you how much weight is on the gear so you can tune it. | *Spring rate (spring_coeff) is the weight on the gear divided by the gear deflection. You can specify Pounds per foot or Newtons per Meter. Look at photos of the aircraft you are modeling before and after it lands to get an idea about how far the gears compress. Multiplying gear/compression-ft by the spring rate will tell you how much weight is on the gear so you can tune it. | ||
*Contacts of type BOGEY get out of control if they intersect the ground at a steep angles. Use STRUCTURE contacts around the BOGEY to limit the ground contact angle. | |||
*Aeromatic uses 20% of the spring rate for a damping rate on the main gear and tail gear and 30% of the nose spring rate. | *Aeromatic uses 20% of the spring rate for a damping rate on the main gear and tail gear and 30% of the nose spring rate. | ||
{{JSBSim}} | {{JSBSim}} | ||