Bode/Nyquist plot..... - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: Bode/Nyquist plot..... (/thread-3822.html) Pages: 1 2 |
RE: Bode/Nyquist/Nichols plot.....Fully functional - toshk - 05-14-2015 10:15 AM Frequency response plots corresponding to G = s + 1 --------------- s^2 + 0.2 s + 1 BODE(ƒ1,ƒ2,[numerator],[denominator]) enter Home Screen. (all functions are executed from Home screen) BODE(-2,2,[1 1],[1 .2 1]) enter Use VIEW key for Plot selection VIEW>>START to refresh Soft menu to Zoom.... App is based on Statistics_2Var_Copy. Code:
RE: Bode/Nyquist plot..... - alexzkter - 05-14-2015 10:17 AM Okay, I get it now. I tried BODE(-1,1,[1],[1 0.2 1]) and got {5} View-->start takes me to an empty home screen. View-->Nyquist, Magnitude and Phase don't do anything.... [attachment=1972] edit1: I was trying with Statistics 1Var, just tried with Statistics 2Var and same result. What am I missing? Edit: Can't get it to compile without Sintax error on physical Prime. And my Prime is just formated, in English. Copied the 2-Var Statistics, renamed it to Statistics_2Var_Copy and on HP Connectivity kit went to Program tab for the Statistics_2Var_Copy app, and replaced the code with the proper one. Did the same thing on Virtual Calculator and got no sintax error (No errors in program)............. RE: Bode/Nyquist plot..... - toshk - 05-14-2015 10:42 AM App is based on Statistics_2Var_Copy. recompile it on your calculator...check for bug (no bugs)and then exit. launch the App again, home screen enter your BODE(-1,1,[1],[1 0.2 1]) View and choose a plot and then hit PLOT to plot it. soft menu to zoom. to plot another graph back out to home and hit VIEW for options. View >> Start/Info will refresh it hit View>> (for options) works here..... RE: Bode/Nyquist plot..... - alexzkter - 05-14-2015 10:48 AM (05-14-2015 10:42 AM)toshk Wrote: App is based on Statistics_2Var_Copy. On just formated Virtual Prime, did just that, and when hitting PLOT button it shows "S1 - Error: Statistics data size not equal": [attachment=1973] :/ RE: Bode/Nyquist plot..... - toshk - 05-14-2015 10:52 AM View>>Start/info and try again...work here. or hit symb key and see whats the parameters? RE: Bode/Nyquist plot..... - alexzkter - 05-14-2015 11:17 AM (05-14-2015 10:52 AM)toshk Wrote: View>>Start/info View-->Start/Info, takes me to an empty white page. I hit View again, and the previous page shows up again (the one with the BODE[.....]) so I hit View once again, choose Niquist for instance, nothing happens, hit plot and this shows up: [attachment=1976] hit Escape and this shows up: [attachment=1978] and if I hit Symb this is what comes up: [attachment=1977] RE: Bode/Nyquist plot..... - toshk - 05-14-2015 11:32 AM (05-14-2015 11:17 AM)alexzkter Wrote:launch the App...you will see empty page(), press any key to go home. enter BODE with your arguments and enter. view>>choose a plot and then hit plot. soft menu for auto scale......(05-14-2015 10:52 AM)toshk Wrote: View>>Start/info if you happen to see error, manually change settings >>press the Symb key and also the plot setup and hit plot gain..., latest firmware? RE: Bode/Nyquist plot..... - alexzkter - 05-14-2015 10:57 PM Finally...the bode code wasn't correct, I was copy pasting it from the web, that's why I was getting {5} instead of something like this: [attachment=1991] So now I'm trying this transfer function: [attachment=1993] But this is what I get: [attachment=1992] What exactly are the f1 and f2 cells for on the bode code? RE: Bode/Nyquist plot.....Fixed - toshk - 05-16-2015 03:57 AM Using your Wolfram in question... BODE(.01,100, [1],[1 1]) .1 and 100 are the frequency range you want to analyze. all plots/bode() executions shd be entered from Home screen. Use VIEW>> {Start/Info, Magnitude, Phase, Nyquist, Nichols} HOME SCREEN VIEW>>Start/Info (refreshes Statistics_2Var_Copy parameters...hit any Key to get You to Home Screen again) Use VIEW>> {Start/Info, Magnitude, Phase, Nyquist, Nichols} again for the same BODE(). use soft Menu zoom (auto-scale)to zone in on plots. (just because i can't graphs to center on the screen) help needed on that!!! This App is based on Statistics_2Var_Copy. You need to recompile before your first use of this App. Code:
FOUND BUG COMPILING WITH DIGIT GROUPING - alexzkter - 05-16-2015 09:41 AM Hi again, I just found out why I was getting Sintax error when compiling in my physical Prime (7820 fw.) I realized that if you compile your program when the 123456,789 digit grouping is selected (the one we use in Spain), you get a Sintax error which doesn't happen if you have the default one (123,456.789). I have to say the digit grouping feature was a really bad idea, it only has given me a lot of trouble :/ By the way, thanks for your last post, will try all that as soon as posible! RE: Bode/Nyquist plot..... - alexzkter - 05-16-2015 10:53 AM Hi again, I didn't know f1 and f2 was the frequency range (rad/s). You typing [-1,1] and [-2,2] on some examples confused me since negative frequencies don't exist. I've been trying to plot this: [attachment=2025] and I got this: [attachment=2024] [attachment=2023] But, I don't understand why the 'x' takes negative values, since that's the frequency axis. How am I supposed to read the frequency values, mate? Thanks in advance RE: Bode/Nyquist plot..... - toshk - 05-16-2015 03:56 PM Use Trace to read values.....or Num key. (the numerical values are really spot on.) remember is a log10 scale: values on the X-axis: values Trace on the X-axis shd be 10^(X-value) .(for magnitude,phase plots) so your negative values on X-axis are pretty much fractions. so instead of -1, 1 just enter .1,10 all in rad/sec. BODE(.1,10 [1],[1 1]) is what you really have to enter. on the Info tab in Conkit just paste the below instructions and recompile the App, this will give you the info when u do start the App or press VIEW>>Start/Info: Frequency response plots corresponding to G = s + 1 ------------ s^2 + 0.2 s + 1 BODE(ƒ1,ƒ2,[numerator],[denominator]) enter BODE(0.01,100,[1 1],[1 .2 1]) enter Use VIEW key for Plot selection VIEW>>START to refresh RE: Bode/Nyquist plot..... - toshk - 05-16-2015 10:51 PM added Response time.....(Time delay....'t') Code:
RE: Bode/Nyquist plot..... - toshk - 05-17-2015 12:40 AM added Response time.....(Time delay....'t')! and adjusted the effect on the phase/Nichols plot Code:
RE: Bode/Nyquist plot..... - StephenG1CMZ - 10-10-2015 10:25 PM (05-16-2015 10:53 AM)alexzkter Wrote: Hi again, I didn't know f1 and f2 was the frequency range (rad/s). You typing [-1,1] and [-2,2] on some examples confused me since negative frequencies don't exist. I haven't studied the graph, but some physicists argue that negative frequencies exist, much like negative distances or displacements. Consider for example a clock, with a second hand rotating clockwise. Apply a negative rotational force - the frequency that the second hands sweeps clockwise will reduce and eventually reach 0. continue to apply the force. The second hand will begin to sweep anti-clockwise at a positive frequency - or clockwise at a negative frequency, if you like. Just like walking -5m North really. Though perhaps it could be called something else, like we distinguish 5m distant (positive) from 5m North (signed). RE: Bode/Nyquist plot..... - don7 - 11-04-2016 06:16 PM This is a nice app -- I'm hoping someone can help with my user errors & setup... I am unable to get the positive values on imaginary axis to display in the nyquist plots (basically anything > 0 on Y axis is not plotted). Positive / negative real values are okay. Is there a setting to change behavior? <corrected above and deleted other question because it was previously answered> Thanks! RE: Bode/Nyquist plot..... - toshk - 11-04-2016 07:36 PM (11-04-2016 06:16 PM)don7 Wrote: This is a nice app -- I'm hoping someone can help with my user errors & setup...symmetric graph..... type: C3:=-C2 hit Symb: check S2: assign C1 C3 Plot: Autoscale to see graph. http://www.hpmuseum.org/forum/thread-3891.html RE: Bode/Nyquist plot..... - don7 - 11-04-2016 10:05 PM Thanks, it's not working for me but I'll keep playing as I'm sure I'm doing something wrong ( calculator is brand new and I'm coming from a 48) Seems that the check box disappears as soon as I run nyquist plot and graph is the same. On home screen I enter: C3:=-C2 (it returns {} or contains data.I'm guessing depending on if I executed bode previously) In the symbol screen, I replace the C0 with C1 and C2 with C3 as well as check the box I then evaluate the bode expression and get the same results as before. If I check back in the symbol I see the check box has cleared but C1/C3 remain. I'll keep playing, thanks for help RE: Bode/Nyquist plot..... - toshk - 11-06-2016 08:34 PM (11-04-2016 10:05 PM)don7 Wrote: Thanks, it's not working for me but I'll keep playing as I'm sure I'm doing something wrong ( calculator is brand new and I'm coming from a 48) executed bode plot the nyquist type: C3:=-C2 hit Symb: check S2: assign C1 C3 Plot: Autoscale to see graph. (DO NOT execute Bode again) RE: Bode/Nyquist plot..... - hectometro00@gmail.com - 11-28-2016 11:10 PM Hi, how can I use delay time? |