Best method of entry.

02232016, 03:26 PM
Post: #1




Best method of entry.
What is the best way to enter the following integral into the Prime?
1/2pi * integral of i(wt) dwt from alpha to beta (this is formula for average current in 1/2wave, single phase rectifier with inductive load) Known from i(wt) formula: i(wt)=6.78*sin(wt0.646)2.67e^(wt/0.754) Given alpha=0.785 and setting wt=beta and i(wt)=0 in above equation I find beta=3.785. I want to make sure I'm inputting the integral correctly to confirm my answers. Thank you 

02242016, 12:23 AM
Post: #2




RE: Best method of entry.  
02242016, 04:03 PM
(This post was last modified: 02242016 04:04 PM by NewMC.)
Post: #3




RE: Best method of entry.
Thanks for the response roadrunner. Alpha was given and I have already solved for beta > pi by setting wt=beta (in i(wt)) and i(wt)=0. Now I'm just looking for the best way to input into the calculator the following in order for the calculator to solve it:
integral i(wt) dwt from 0.785 to 3.785 So: integral (6.78*sin(wt0.646)2.67e^(wt/0.754)) dwt from 0.785 to 3.785 Does this help to clear up what I'm looking for? It looks like this is close to what you've done but when I input the first line from your picture: ii:=(wt)>(xxx) in Function/CAS I get an unspecified error, when I choose OK it puts the cursor between the first w and t in the statement. Maybe there is something wrong with my key sequence for the input? Keystrokes: alpha, i, alpha, i, shift, Vars, :, enter, shift, ., (), alpha, w, alpha, t, right on directional pad, shift, 9, right arrow, (), then input expression. 

02242016, 07:51 PM
Post: #4




RE: Best method of entry.
Hi,
Is this what you mean? ∫(6.78*sin(wt0.646)2.67*e^(wt/0.754),wt,0.785,3.785) Returns around 12.797 with radians set Use the template on the "C" button to assist with inputting the integral Cheers, Terje 

02242016, 10:56 PM
Post: #5




RE: Best method of entry.
(02242016 04:03 PM)NewMC Wrote: when I input the first line from your picture: ii:=(wt)>(xxx) in Function/CAS I get an unspecified error, when I choose OK it puts the cursor between the first w and t in the statement Do you have the latest firmware version? Try it this way: ii(wt):=2.67*e^(1.32625994695*wt)+6.78*sin(wt0.646) Or just cut and paste the line above into the emulator. then type or cut and paste: ∫(ii(wt),wt,0.785,3.785) You should get the same answer as Terja road 

02252016, 05:24 PM
Post: #6




RE: Best method of entry.
Thanks guys, this works both ways now, not sure what I was/wasn't doing wrong the other day. I appreciate your time!


« Next Oldest  Next Newest »

User(s) browsing this thread: 1 Guest(s)