[simpits-tech] May the Force Feedback be with you...

Wed, 05 Feb 2003 20:39:44 -0600

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Ken,

The servo operated valve modulates the air venting from one side of the 
cylinder to the other.  When the servo is sensing low airspeeds the 
valve permits relatively free flow (the stick can be moved with light 
force).  As the airspeed increases, the valves starts restricting the 
flow proportionally, requiring a higher force to move the stick 
(representing aero forces on the control surfaces).  Remember, I am 
building a WWII fighter, not a fly-by-wire jet.  The solenoid valve is 
just there to provide pressure "pulses" in response to force feedback 
signals.

Hope I made sense.

Keenan

Ken Schlote wrote:

> 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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Ken,<br>
<br>
The servo operated valve modulates the air venting from one side of the cylinder
to the other. &nbsp;When the servo is sensing low airspeeds the valve permits
relatively free flow (the stick can be moved with light force). &nbsp;As the airspeed
increases, the valves starts restricting the flow proportionally, requiring
a higher force to move the stick (representing aero forces on the control
surfaces). &nbsp;Remember, I am building a WWII fighter, not a fly-by-wire jet.
&nbsp;The solenoid valve is just there to provide pressure "pulses" in response
to force feedback signals.<br>
<br>
Hope I made sense.<br>
<br>
Keenan<br>
<br>
<br>
Ken Schlote wrote:<br>
<blockquote type="cite" cite="mid:20030205225520.16896.qmail@web13403.mail.yahoo.com">
  <p>Keenan, </p>
  <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>
  <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.&nbsp;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>
  <p>Hope this helps. Questions?  </p>
  <p>Ken  </p>
  <p>&nbsp;<b><i>"Akin, Keenan L" <a class="moz-txt-link-rfc2396E" href="mailto:keenan.l.akin@boeing.com">&lt;keenan.l.akin@boeing.com&gt;</a></i></b> wrote:
 </p>
  <blockquote style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(16,16,255); 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>
&lt;<FFACTUATOR .gif="">&gt; <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>
&gt; ATTACHMENT part 2 image/gif name=ffactuator.gif </FFACTUATOR></blockquote>
    <p><br>
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