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JSBSim: Difference between revisions
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== Overview == | == Overview == | ||
JSBSim provides several different physics models which work together to calculate the overall vehicle dynamics. | JSBSim provides several different physics models which work together to calculate the overall vehicle dynamics. | ||
* Mass Balance - This model uses weight (mass) to provide a force due to gravity and moments of inertia to damp changes in rotational velocity. Empty mass and inertia are specified, and point masses (which can have a shape and size) and fuel load are added in. | * [[JSBSim Mass and balance|Mass Balance]] - This model uses weight (mass) to provide a force due to gravity and moments of inertia to damp changes in rotational velocity. Empty mass and inertia are specified, and point masses (which can have a shape and size) and fuel load are added in. | ||
* Ground Reactions - JSBSim has a fairly simple system for ground reactions. You can have structural contacts which are uni-directional or bogeys which act only in a given direction. Both are modeled as spring and damper systems. Each bogey or structural contact provides a force on the vehicle when in contact with the ground. If the contact is not at the CG it also provides a rotating moment. | * [[JSBSim GroundReactions|Ground Reactions]] - JSBSim has a fairly simple system for ground reactions. You can have structural contacts which are uni-directional or bogeys which act only in a given direction. Both are modeled as spring and damper systems. Each bogey or structural contact provides a force on the vehicle when in contact with the ground. If the contact is not at the CG it also provides a rotating moment. | ||
* Propulsion - JSBSim models a variety of engine types using different methods. All engines provide a force along their X axis, and create moments if this force in not applied at the CG. The propeller and rotor thrusters also create turning moments. | * [[JSBSim Engines|Propulsion]] - JSBSim models a variety of engine types using different methods. All engines provide a force along their X axis, and create moments if this force in not applied at the CG. The propeller and rotor thrusters also create turning moments. | ||
* Aerodynamics - JSBSim's aerodyamics are a blank slate. It is entirely up to the vehicle author to use valid formulas. The aerodynamic force is divided into Lift, Drag, and Side. You can also create Roll, Pitch and Yaw moments. In addition, if the aerodynamic force reference point is not coincident to the CoG the forces will create a hidden moment. | * [[JSBSim Aerodynamics|Aerodynamics]] - JSBSim's aerodyamics are a blank slate. It is entirely up to the vehicle author to use valid formulas. The aerodynamic force is divided into Lift, Drag, and Side. You can also create Roll, Pitch and Yaw moments. In addition, if the aerodynamic force reference point is not coincident to the CoG the forces will create a hidden moment. | ||
* Buoyant forces - Lighter than air craft, i.e., balloons, pressure airships (e.g. blimps) and rigid airships, can be simulated with this model. | * Buoyant forces - Lighter than air craft, i.e., balloons, pressure airships (e.g. blimps) and rigid airships, can be simulated with this model. | ||