Welcome Guest! To enable all features please Login. New Registrations are disabled.

Notification

Icon
Error

Login


Options
Go to last post Go to first unread
Offline phili-marx  
#1 Posted : 09 November 2018 18:33:40(UTC)
phili-marx

Rank: Newbie

Groups: Registered
Joined: 09/11/2018(UTC)
Posts: 2
Germany
Location: Dresden

Hello people,

I'm new to this kind of software. Normally i work with excel.

I'm doing internships with students where they measuring for example for different flow the losses in a system. In Excel i did that calculation in a table, but it was hard to display the formulars.

So now my problem is: When i put the values which were measured in a matrix, it is not possible to square it...
Addition is workig really well.
So should i put it in lists? But with lists its not possible to do addition...

You may have a look to my data...

i have the vector v1 and in the formula i need v1^2, but it doesnt calculate the right value...

Praktikum Venturi Blende.sm (35kb) downloaded 28 time(s).

Thanks for you reply

Wanna join the discussion?! Login to your SMath Studio Forum forum account. New Registrations are disabled.

Offline Razonar  
#2 Posted : 09 November 2018 19:22:20(UTC)
Razonar


Rank: Advanced Member

Groups: Registered
Joined: 28/08/2014(UTC)
Posts: 1,356
Uruguay

Was thanked: 815 time(s) in 516 post(s)
Originally Posted by: phili-marx Go to Quoted Post
Hello people,

i have the vector v1 and in the formula i need v1^2, but it doesnt calculate the right value...

Praktikum Venturi Blende.sm (35kb) downloaded 28 time(s).

Thanks for you reply


Hi. You can use v1[k for square it, or better, not using the k range, with the vectorize operator (the arrow in the matrix palette) when the expression is evaluated for some more complicated expression than sums or products by scalars. Please, see the attached.

Praktikum Venturi Blende.sm (31kb) downloaded 35 time(s).

SMath vectorization is something like dot operator in matlab.

Best regards.
Alvaro.
Offline Jean Giraud  
#3 Posted : 10 November 2018 02:14:12(UTC)
Jean Giraud

Rank: Guest

Groups: Registered
Joined: 04/07/2015(UTC)
Posts: 6,868
Canada

Was thanked: 980 time(s) in 808 post(s)
Originally Posted by: phili-marx Go to Quoted Post
I'm doing internships with students where they measuring for example for different flow the losses in a system.

... few more stuff for your Classroom Internships.

The orifice Plate [ISO-5167] is the standard I have use since Windows.
Previous to Windows, used Sharp pocket calculator iterative method.
Previous to calculating machinery: used the Foxboro booklet and log tables.
One way or another, Iso-5167 implements the 1970 Foxboro.
Orifice plate is an Engineering document.

Jean

Inst_Colebrook MOODY.sm (20kb) downloaded 27 time(s).
Inst_Orifice Plate.sm (388kb) downloaded 34 time(s).
Inst_Flow Profile.sm (674kb) downloaded 33 time(s).
Offline Jean Giraud  
#4 Posted : 10 November 2018 02:41:42(UTC)
Jean Giraud

Rank: Guest

Groups: Registered
Joined: 04/07/2015(UTC)
Posts: 6,868
Canada

Was thanked: 980 time(s) in 808 post(s)
... a much better demonstrative Vena Contracta.

VenaContracta.PNG
Offline phili-marx  
#5 Posted : 13 November 2018 15:00:58(UTC)
phili-marx

Rank: Newbie

Groups: Registered
Joined: 09/11/2018(UTC)
Posts: 2
Germany
Location: Dresden

Dear people,

thanks for all of your replys. I didnt think, that i would get a answer.
Helped a lot and I understood the problem.

Thanks also for all the feature documents relating to the orifice/venturi calculation.

Thanks. Air kiss
Offline Jean Giraud  
#6 Posted : 13 November 2018 16:53:09(UTC)
Jean Giraud

Rank: Guest

Groups: Registered
Joined: 04/07/2015(UTC)
Posts: 6,868
Canada

Was thanked: 980 time(s) in 808 post(s)
Originally Posted by: phili-marx Go to Quoted Post
Thanks also for all the feature documents relating to the orifice/venturi calculation.

1. [1975..77] I was involved with the Montreal sewage pumping station, at the time the world
biggest project of the kind, presented to an International Symposium [Yougoslavia].
17 pumps 100000 UGM each, of which two variable speed, 139 ft deep. At the top discharge, 17 Venturi
flow measuring devices, each 8 ft diameter [Brooks ~ 1000000 $ each] Pump engine 4500 HP each.

2. The best beta ratio [Orifice Plate] is around 0.62. Installed in machined meter run and lab tested
give the best accurate mass-flow rate. An industrial plant may have 100's measuring points. It won't
be be practical to have each flow meter associated with its own calibration. Instead we calculate/bore
each orifice plate with its own beta ratio, thus minimizing the burden of the Instrument Men !
No point to purchase expensive Orifice Plate software, Smath does it just perfect.

Cheers ... Jean

Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.