Dick,
Dick Rasmussen <rasmussend@mindspring.com> wrote:
> At 07:40 PM 4/15/02, Gary Browning wrote:
>
> >But the map was not what I expected. I had expected a pattern of an upside
> >down 'T' like the pattern I had moved the G-Cube through. What I got was a
> >line that started at the bottom and went vertically up. There were no left
>or
> >right, just vertical !! The L/R strip chart shows 0.2G left at one point,
> >but map shows no left movement. It does show vertical movement though.
>
> Gary,
>
> I'm not clear on what you actually did ...
It was pointed out to me that the lateral acceleration values are treated
differently than the forward/reverse acceleration values when generating the
map.
The test I did was not a real world one like I expected because the "car" had
lateral acceleration with no velocity (standing still). It is pretty hard for a
car to go sideways unless it has some forward/reverse velocity.
The lateral acceleration values are used with calculated velocity to
determine the radius of the curve. No velocity, no radius. Doh!
> ... but you might try this:
>
> Use your normal settings including autostart.
>
> Tip cube first on say the back side (simulates a start), then the left
> side, then the right side, then the front. (just like during calibration)
> Repeat a few times just to be sure you have started the recording and keep
> it going long enough to get a minimum run.
>
> When the cube is actually on a side, front, or back the G reading should be
> 1 (if I recall) in the relevant direction. The lateral g's would alternate
> between 1 g left, zero, and 1 g right. Accel would alternate between 1 g
> accel, zero, and 1 g braking. Basically lots of "steps" if you are smooth
> but relatively quick with the changes.
>
> It has "been awhile" so I don't guarantee that this is correct:-)
Regarding a better checkout procedure, something akin to what you have suggested
should work. I'll pass along what was suggested to me -- place the bottom
against
a wall and the rotate it to test each direction (front, right, back, left). The
lateral and for/aft strip charts should be checked and the total g's strip chart
will always be 1g. I'll have to give this a try.
-- Gary
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