On Sun, Jul 27, 2008 at 6:42 AM, Darren Conway wrote:
> For my job, I need to understand how adjustments are made to (what I'm
>> calling) velocity–ramp-up/-down–time, and constant-velocity–coast–time in
>> order to ensure that these are integer multiples of the time step. If you
>> can explain the code to me (cradek, perhaps), or the algorithm, or even know
>> a good reference for this, please let me know (on- or off-list, as seems
>> appropriate).
>>
> Before you tackle this problem, are you sure you have one. If the sample
> rate is sufficiently higher than the time constants, then
> corrections/adjustments probably aren't going to make much difference. Any
> benefits may be lost in noise.
>
> Are the adjustments already in the code, or is this something that has been
> identified as a worthwhile enhancement?
>
The adjustments are not in the code, and problems with the cut have been
observed that seem to indicate this problem. Not so noticeable in
straight-line cuts, but very problematic in circles; but I need to
understand the one before I tamper with the other.
The idea I've been working with was to find a simple relationship between
ramp & coast time & distance *t*r, *t*c, *d*r, & *d*c that is independent of
ramp acceleration *a*r, coast velocity *v*c, or (if possible) line length |*
l*|. Then, the times can both be increased to an integer multiple of the
time-step *T*, a simple equation solved for *d*r, & *d*c, and *v*c &
*a*rsolved for almost trivially.
I think I'll write this all up when I'm done and see if I can get my
Master's thesis out of it…
--Joel
--
It reverses the normal flow of conversation.
> What's wrong with top-posting?
>
>> Top-posting.
>>
>>> What's the biggest scourge on plain text email discussions?
>>>
>>
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