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Оптимизация - Долгое время расчета - Messages
#1 Posted: 2/27/2021 5:04:03 PM
Добрый день.
Помогите (или подскажите) пожалуйста с оптимизацией. Довольно долгий расчет (около 30 сек). Если уменьшить параметр m, то время расчета уменьшается, но хотелось бы как то оптимизировать.Gidrodinamika.sm (105.86 KiB) downloaded 268 time(s).
Помогите (или подскажите) пожалуйста с оптимизацией. Довольно долгий расчет (около 30 сек). Если уменьшить параметр m, то время расчета уменьшается, но хотелось бы как то оптимизировать.Gidrodinamika.sm (105.86 KiB) downloaded 268 time(s).
#2 Posted: 2/27/2021 7:33:13 PM
If you shorten the code, then the calculation is performed
an order of magnitude faster
Gidrodinamika1.sm (111.05 KiB) downloaded 267 time(s).
an order of magnitude faster
Gidrodinamika1.sm (111.05 KiB) downloaded 267 time(s).
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Serg 2/28/2021 4:17:00 AM
#3 Posted: 2/28/2021 4:05:02 PM
Финальный расчет во вложении.
Большое спасибо Ber7 за помощь в оптимизации
Opredelenie gidrodinamicheskogo davlenija_v001.sm (128.74 KiB) downloaded 266 time(s).
Большое спасибо Ber7 за помощь в оптимизации

Opredelenie gidrodinamicheskogo davlenija_v001.sm (128.74 KiB) downloaded 266 time(s).
#4 Posted: 3/1/2021 5:18:30 AM
#5 Posted: 3/1/2021 7:16:06 AM
I don't understand this formula, but Try to substitute 2n -1 instead of n
2n-1.sm (134.68 KiB) downloaded 269 time(s).
2n-1.sm (134.68 KiB) downloaded 269 time(s).
1 users liked this post
Serg 3/1/2021 7:39:00 AM
#6 Posted: 3/1/2021 7:40:11 AM
WroteI don't understand this formula, but Try to substitute 2n -1 instead of n
2n-1.sm (134.68 KiB) downloaded 269 time(s).
Да это то, что нужно. Спасибо.
Opredelenie gidrodinamicheskogo davlenija_v001.sm (187.99 KiB) downloaded 264 time(s).
#7 Posted: 3/1/2021 11:37:12 AM
WroteI don't understand this formula
I don't understand much in there either.
We can get the shape of the upper right image.
2n-1.sm (142.77 KiB) downloaded 257 time(s).
#8 Posted: 3/1/2021 2:32:53 PM
#10 Posted: 3/1/2021 5:55:59 PM
WroteWhat's your comment on that ?
Визуально очень похоже... нужно потестировать по ряду значений ... есть графики в книге Бирбраера (рис. 9.9). Я его оцифровывал с помощью GetData Graph Digitizer (примерно конечно).Birbraer_ris.9.9.xlsx (103.48 KiB) downloaded 250 time(s).
Именно эта формула и графики одно и тоже.
В Smath у меня эта эпюра ломается внизу ... пока не разобрался почему.
#11 Posted: 3/1/2021 8:51:55 PM
WroteGetData Graph Digitizer
We can do it in Smath providing the image is cleaned manually
and the coordinates [Xmax, Xmin ...Ymax, Ymin] are given or
otherwise guesstimated. Freeware Tracer can do as well but
again cleaned image and coordinates.
Your approximation sounds OK ... many more can be envisaged.
My little Russian is dead for over 50 years .
Cheers ... Jean
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Serg 3/2/2021 10:33:00 AM
#12 Posted: 3/1/2021 10:57:15 PM
#13 Posted: 3/2/2021 2:38:47 AM
Wrote... smoothed data from Tracer.
... it can be improved a bit. But, what a dirty image to digitize !
Page15 Tracer.sm (71.66 KiB) downloaded 296 time(s).
#14 Posted: 3/2/2021 2:23:15 PM
This document resumes and compares your fitting model
vs the digitized image, from improved session.
You may attempt to adapt your model to the digitized data.
Maybe there is a Thiele fit to your blue/red data points.
I will try that soon ... Jean.
2n-1 [Jean].sm (188.23 KiB) downloaded 216 time(s).
vs the digitized image, from improved session.
You may attempt to adapt your model to the digitized data.
Maybe there is a Thiele fit to your blue/red data points.
I will try that soon ... Jean.
2n-1 [Jean].sm (188.23 KiB) downloaded 216 time(s).
1 users liked this post
Serg 3/2/2021 3:16:00 PM
#15 Posted: 3/2/2021 3:20:35 PM
В книге Бирбраера рис. 9.8 несет в себе только информацию касаемо куда какая нагрузка прикладывается и форма приведена условно, т.е. схема. Сам рис. 9.8 не претендует на оцифровку - это не график, а картинка.
А вот рис. 9.9 - это набор графиков уже и именно их я и оцифровывал еще когда не разобрался с формулой 9.51.
Т.е. именно этот набор графиков определяет форму эпюры гидродинамического давления.
А вот рис. 9.9 - это набор графиков уже и именно их я и оцифровывал еще когда не разобрался с формулой 9.51.
Т.е. именно этот набор графиков определяет форму эпюры гидродинамического давления.
#16 Posted: 3/2/2021 4:58:13 PM
In Birbraer's book, fig. 9.8 carries only information with regards to where what load is applied and the form is given conditionally, i.e. scheme. The rice itself. 9.8 does not pretend to be digitized - it is not a graph, but a picture.
And here is rice. 9.9 is a set of graphs already, and it was them that I digitized even when I had not figured out the formula 9.51.
Thus, it is this set of plots that determines the shape of the hydrodynamic pressure plot.
...................
So, my understanding is that the formula 9.51 is the one that determines,
the hydrodynamic pressure. It looks damned close parent to Eiffel Tower shape.
Then, it is not needed to be discretized, simply plot scalar.
However, I don't think you can plot opposite reverse, wish I'm wrong.
Very interesting project, thanks ... Jean
2n-1 [Jean].sm (243.28 KiB) downloaded 221 time(s).
And here is rice. 9.9 is a set of graphs already, and it was them that I digitized even when I had not figured out the formula 9.51.
Thus, it is this set of plots that determines the shape of the hydrodynamic pressure plot.
...................
So, my understanding is that the formula 9.51 is the one that determines,
the hydrodynamic pressure. It looks damned close parent to Eiffel Tower shape.
Then, it is not needed to be discretized, simply plot scalar.
However, I don't think you can plot opposite reverse, wish I'm wrong.
Very interesting project, thanks ... Jean
2n-1 [Jean].sm (243.28 KiB) downloaded 221 time(s).
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