[simpits-tech] May the Force Feedback be with you...
Ken Schlote
simpits-tech@simpits.org
Wed, 5 Feb 2003 14:55:20 -0800 (PST)
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Keenan,
I'm not quite sure why you are using air pressure to increase the force of a stick. If you are going to use a cylinder then just adjust the flow entering or leaving the cylinder. Example: By closing the rear port you either have to pull a vacuum or pressurize the cylinder which stops you from moving the shaft because the air can not escape or enter. Adjusting the flow leaving or entering allows the shaft to move but with more force.
A "V notch port" will do the job. (see attachment). As the V notch plug is pulled out of the port more air can escape or enter letting the shaft move with less force. As it moves in, the force increases because the size of the port decreases. This can all be done with one servo and cylinder per axis.
Hope this helps. Questions?
Ken
"Akin, Keenan L" <keenan.l.akin@boeing.com> wrote: Okay folks,
Here is my current concept of a pneumatic force feedback actuator for my pit. There would be two of these actuators attached to the stick (one pitch axis, one roll axis).
<>
The servo driven valve uses airspeed data to modulate the airflow from one side of the cylinder to the other (caused by moving the stick). For example, at higher airspeeds, the flow will be restricted, causing the stick to be harder to move.
The solenoid valve ports pressurized air to one side of the cylinder or to the other only when a force feedback signal directs it. Otherwise, it is closed.
Thoughts? Questions?
Keenan
> ATTACHMENT part 2 image/gif name=ffactuator.gif
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<P>Keenan,
<P>I'm not quite sure why you are using air pressure to increase the force of a stick. If you are going to use a cylinder then just adjust the flow entering or leaving the cylinder. Example: By closing the rear port you either have to pull a vacuum or pressurize the cylinder which stops you from moving the shaft because the air can not escape or enter. Adjusting the flow leaving or entering allows the shaft to move but with more force.
<P>A "V notch port" will do the job. (see attachment). As the V notch plug is pulled out of the port more air can escape or enter letting the shaft move with less force. As it moves in, the force increases because the size of the port decreases. This can all be done with one servo and cylinder per axis.
<P>Hope this helps. Questions?
<P>Ken
<P>
<P> <B><I>"Akin, Keenan L" <keenan.l.akin@boeing.com></I></B> wrote:
<BLOCKQUOTE style="BORDER-LEFT: #1010ff 2px solid; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">Okay folks,<BR><BR>Here is my current concept of a pneumatic force feedback actuator for my pit. There would be two of these actuators attached to the stick (one pitch axis, one roll axis). <BR><BR><<FFACTUATOR.GIF>> <BR>The servo driven valve uses airspeed data to modulate the airflow from one side of the cylinder to the other (caused by moving the stick). For example, at higher airspeeds, the flow will be restricted, causing the stick to be harder to move.<BR><BR>The solenoid valve ports pressurized air to one side of the cylinder or to the other only when a force feedback signal directs it. Otherwise, it is closed.<BR><BR>Thoughts? Questions?<BR><BR>Keenan<BR>> ATTACHMENT part 2 image/gif name=ffactuator.gif </BLOCKQUOTE><p><br><hr size=1>Do you Yahoo!?<br>
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