modelBasicRelativePosition
Extends from Modelica.Mechanics.MultiBody.Sensors.Internal.PartialRelativeBaseSensor (Base class for relative sensor models defined by equations (frame_resolve must be connected exactly once)).
Information
This basic sensor is aimed to be used within advanced sensors where the relative position vector between the origins of frame_a and frame_b should be determined. This vector is provided at the output signal connector r_rel.
Via parameter resolveInFrame it is defined in which frame the position vector is resolved:
| resolveInFrame = Types.ResolveInFrameAB. | Meaning |
|---|---|
| world | Resolve vector in world frame |
| frame_a | Resolve vector in frame_a |
| frame_b | Resolve vector in frame_b |
| frame_resolve | Resolve vector in frame_resolve |
In this basic sensor model, the connector frame_resolve is always enabled and must be connected. If resolveInFrame = Types.ResolveInFrameAB.frame_resolve, the vector r_rel is resolved in the frame to which frame_resolve is connected.
Example
If resolveInFrame = Types.ResolveInFrameAB.frame_a, the output vector is computed as:
r_rel = MultiBody.Frames.resolve2(frame_a.R, frame_b.r_0 - frame_a.r_0);
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Mechanics.MultiBody.Types.ResolveInFrameAB | resolveInFrame | Modelica.Mechanics.MultiBody.Types.ResolveInFrameAB.frame_a | Frame in which output vector r_rel is resolved (world, frame_a, frame_b, or frame_resolve) |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Mechanics.MultiBody.Interfaces.Frame_a | frame_a (from PartialRelativeBaseSensor) | Coordinate system a (measurement is between frame_a and frame_b) | |
| Modelica.Mechanics.MultiBody.Interfaces.Frame_b | frame_b (from PartialRelativeBaseSensor) | Coordinate system b (measurement is between frame_a and frame_b) | |
| Modelica.Mechanics.MultiBody.Interfaces.Frame_resolve | frame_resolve (from PartialRelativeBaseSensor) | Coordinate system in which vector is optionally resolved | |
| Modelica.Blocks.Interfaces.RealOutput[3] | r_rel | Relative position vector frame_b.r_0 - frame_a.r_0 resolved in frame defined by resolveInFrame |