"RRogers" <rerogers@plaidheron.com> schrieb im Newsbeitrag
news:b489cc63-2964-418f-9dcd-90fd9e4b3683@z3g2000prd.googlegroups.com...
> On Nov 15, 6:14 am, "JCH" <ja...@nospam.arcornews.de> wrote:
>> "RRogers" <rerog...@plaidheron.com> schrieb im
>> Newsbeitragnews:3d4e61d7-69d7-4431-a12a-88e31d5868f7@x5g2000prf.googlegroups.com...
>>
>>
>>
>> > clip..........
>> >> ...
>>
>> >> read more �
>>
>> > Okay I have uploaded the file that corresponds to step inputs. This
>> > one is fairly clean.
>> >http://www.plaidheron.com/ray/temp
>> > static-test.jpg
>> > static-test.xls
>> > Should get you there. If there is a permission problem let me know; I
>> > will resolve.
>>
>> > The .jpg is a graph to get the idea. T-11 is included to verify the
>> > environment didn't change much.
>> > The .xls is: sheet 1 graphs, sheet static-test is the long
>> > experimental run covering about 4 hours
>> > Cols: T-1,2,3 are the three direct thermistors used later for control
>> > Cols: M,N,O are the PWM drives, 0-100%, to the corresponding heaters;
>> > the trailing columns can be ignored
>> > The intermediate columns are various sensors distributed away from the
>> > actively controled points.
>>
>> > Let me know and I (or you ) can cross-verify your model against other
>> > experimental runs.
>>
>> > I have other experimental data sets that are less clear; some are
>> > basically random inputs to try to satisfy the sys-id programs.
>>
>> Basically refering to
>>
>> *http://home.arcor.de/janch/janch/_control/20081123-real-system-model/
>>
>> Can you approach the best possible ODE (process transfer function) in a
>> range of order <= 6?
>>
>> C6 y'''''' + C5 y''''' + C4 y'''' + C3 y''' + C2 y'' + C1 y' + y = K
>>
>> Decimal commas!
>>
>> Example data points: 30
>>
>> 0 0
>> 0,062 0
>> 0,124 0,002
>> 0,187 0,012
>> 0,249 0,04
>> 0,311 0,093
>> 0,373 0,17
>> 0,435 0,266
>> 0,498 0,373
>> 0,56 0,48
>> 0,622 0,581
>> 0,684 0,671
>> 0,746 0,748
>> 0,809 0,811
>> 0,871 0,861
>> 0,933 0,899
>> 0,995 0,929
>> 1,057 0,95
>> 1,12 0,966
>> 1,182 0,977
>> 1,244 0,984
>> 1,306 0,99
>> 1,368 0,993
>> 1,431 0,996
>> 1,493 0,998
>> 1,555 0,999
>> 1,617 1
>> 1,679 1
>> 1,741 1
>> 1,804 1,001
>>
>> --
>> Regards JCH
>>
>> My solution see down here:
>>
>> Decimal commas!
>> 1,048734E-06 y'''''' + 6,2427E-05 y''''' + 0,001548347 y'''' + 0,02048154
>> y''' + 0,1523982 y'' + 0,6047773 y' + y = 1,000953
>
> We seem to have a disconnect here.
> The system is MIMO which means that a finite model would have a set of
> simultaneous differential equations...
If you can't find one differential equation (process transfer function) as
part of a set you won't be able to solve anything.
See basics and decoupling of MIMO system:
* http://home.arcor.de/janch/janch/_control/20091117-mimo-system/
--
Regards JCH