Table of Contents
Host Force Feedback Constant Force
Produces a condition force effect on a game controller on the host.
Library
MATLAB Command Line
Click to copy the following command line to the clipboard. Then paste it in the MATLAB Command Window:
qc_open_library('quarc_library/Devices/Peripherals/Host/Force Feedback Game Controllers/Constant Force Effects')Description
The Host Force Feedback Constant Force block produces a steady force on the host game controller. The Fx, Fy and Fz inputs define a force vector whose magnitude and direction determines the magnitude and direction of the force applied by the game controller. The magnitude and direction of this force are updated every sampling instant according to the inputs to the block. A Host Force Feedback Game Controller block must be present in the model to configure the game controller.
Limitations
Unused axes
Unused axes should be left unconnected or connected to the
MATLAB Command Line
Click to copy the following command line to the clipboard. Then paste it in the MATLAB Command Window:
doc('Ground')Level of support
Not all force feedback game controllers will support the constant force effect. If constant force effects are supported, a game controller may not support all the axes or features of this block.
Conditionally-executed subsystems
Force effects are downloaded to the device and implemented by the device itself. Hence, placing this blocking in a conditionally-executed subsystem does not disable the effect when the subsystem is not being executed. Instead of using a conditionally-executed subsystem, set the magnitude of the force to zero or use a Host Force Feedback Externally-Triggered Constant Force block for this purpose.
MATLAB/Simulink R2010a Support
Note that the Host Force Feedback Constant Force block available in this build of QUARC 2.1 does not currently support MATLAB/Simulink R2010a. Quanser is currently working on a solution to not only have this block work with MATLAB/Simulink R2010a but also greatly improve its overall performance and capabilities.
Input Ports
Fx
The normalized force to apply in the X direction (-1.0=-maximum, 0.0=no force, 1.0=+maximum). The positive X direction is from left to right. If this axis is unused, connect it to a
MATLAB Command Line
Click to copy the following command line to the clipboard. Then paste it in the MATLAB Command Window:
doc('Ground')Fy
The normalized force to apply in the Y direction (-1.0=-maximum, 0.0=no force, 1.0=+maximum). The positive Y direction is from back to front. If this axis is unused, connect it to a
MATLAB Command Line
Click to copy the following command line to the clipboard. Then paste it in the MATLAB Command Window:
doc('Ground')Fz
The normalized force to apply in the Z direction (-1.0=-maximum, 0.0=no force, 1.0=+maximum). The positive Z direction is from up to down. If this axis is unused, connect it to a
MATLAB Command Line
Click to copy the following command line to the clipboard. Then paste it in the MATLAB Command Window:
doc('Ground')Output Ports
This block has no output ports.
Parameters and Dialog Box
Controller name
The identity of the associated Host Force Feedback Game Controller block. The Host Force Feedback Constant Force block must be associated with a Host Force Feedback Game Controller block.
Effect gain (tunable online)
A normalized gain to apply to the effect. The forces are scaled by this gain before being applied to the device. The gain must be a fraction between 0 and 1 inclusive. This parameter is useful for scaling effects for a different game controller.
Effect sampling period (tunable online)
The sampling period of the effect in seconds. This parameter determines the sampling period of the effect on the device itself. It is not related to the sample time of this block. If this value is zero, the default sampling period is used.
Sample time
The sample time of the block. A sample time of 0 indicates that the block will be treated as a continuous time block. A positive sample time indicates that the block is a discrete time block with the given sample time.
A sample time of -1 indicates that the block inherits its sample time from its inputs.
To use the fundamental sampling time of the model, set the sample time to qc_get_step_size, which is a QUARC function that returns the fundamental sampling time of the model.
The default sample time is set to -1
because this block typically inherits its sample time from its inputs.
Targets
Target Name |
Compatible* |
Model Referencing |
Comments |
---|---|---|---|
Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
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Yes |
Yes |
||
Yes |
Yes |
||
Yes |
Yes |
||
Yes |
Yes |
||
Yes |
Yes |
||
Yes |
Yes |
||
Yes |
Yes |
||
Yes |
Yes |
||
Yes |
Yes |
Last fully supported in QUARC 2018. |
|
Rapid Simulation (RSIM) Target |
Yes |
Yes |
|
S-Function Target |
No |
N/A |
Old technology. Use model referencing instead. |
Normal simulation |
Yes |
Yes |
See Also
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