Apps

Electrical Oscillator

Apps.ElectricalOscillator History

Hide minor edits - Show changes to output

Deleted lines 23-27:

!!!! Predictions

* %list list-page% (:html:)<a href="/online/plot.php?d=oscillator&f=SV(2).xml">Signal</a>(:htmlend:)
* %list list-page% (:html:)<a href="/online/plot.php?d=oscillator&f=SV(3).xml">Signal Derivative</a>(:htmlend:)
May 26, 2010, at 06:06 AM by 158.35.225.240 -
Changed lines 27-28 from:
* %list list-page% (:html:)<a href="http://apmonitor.ath.cx/online/plot.php?d=oscillator&f=SV(2).xml">Signal</a>(:htmlend:)
* %list list-page% (:html:)<a href="http://apmonitor.ath.cx/online/plot.php?d=oscillator&f=SV(3).xml">Signal Derivative</a>(:htmlend:)
to:
* %list list-page% (:html:)<a href="/online/plot.php?d=oscillator&f=SV(2).xml">Signal</a>(:htmlend:)
* %list list-page% (:html:)<a href="/online/plot.php?d=oscillator&f=SV(3).xml">Signal Derivative</a>(:htmlend:)
March 06, 2010, at 02:44 AM by 206.180.155.75 -
Changed line 32 from:
(:html:)<font size=1><pre>
to:
(:html:)<font size=2><pre>
Changed lines 60-61 from:
(:htmlend:)
to:
(:htmlend:)
April 23, 2009, at 10:45 AM by 158.35.225.231 -
Added lines 29-61:

----

(:html:)<font size=1><pre>
! APMonitor Modeling Language
! http://www.apmonitor.com

Model osc
  Parameters
    mu = 1
    A = 1
    omega = 2
    b = 2
  End Parameters

  Variables
    t = 0
    x = b
    y = b/(mu*(1-b^2))
  End Variables

  Equations
    ! time integrator
    $t = 1

    ! oscillator
    $x = y
    $y + mu*(x^2-1)*$x + x = A * sin(omega*t)
  End Equations
End Model
</pre></font>
(:htmlend:)

November 03, 2008, at 09:29 AM by 158.35.225.228 -
Changed line 7 from:
The van der Pol oscillator was originally ''discovered'' by the Dutch electrical engineer and physicist Balthasar van der Pol. Van der Pol found stable oscillations, now known as limit cycles, in electrical circuits employing vacuum tubes. When these circuits are driven near the limit cycle they become entrained, i.e. the driving signal pulls the current along with it. Van der Pol and his colleague van der Mark reported in the September 1927 issue of Nature that at certain drive frequencies an irregular noise was heard. This irregular noise was always heard near the natural entrainment frequencies. This was one of the first discovered instances of deterministic chaos.
to:
The van der Pol oscillator was originally ''discovered'' by the Dutch electrical engineer and physicist Balthasar van der Pol. Van der Pol found stable oscillations, now known as limit cycles, in electrical circuits employing vacuum tubes. When these circuits are driven near the limit cycle they become entrained, i.e. the driving signal pulls the current along with it. Van der Pol and his colleague van der Mark reported in that at certain drive frequencies an irregular noise was heard. This irregular noise was always heard near the natural entrainment frequencies. This was one of the first discovered instances of deterministic chaos.
November 03, 2008, at 07:40 AM by 158.35.225.228 -
Changed line 28 from:
* %list list-page% (:html:)<a href="http://apmonitor.ath.cx/online/plot.php?d=cells&f=SV(3).xml">Signal Derivative</a>(:htmlend:)
to:
* %list list-page% (:html:)<a href="http://apmonitor.ath.cx/online/plot.php?d=oscillator&f=SV(3).xml">Signal Derivative</a>(:htmlend:)
November 03, 2008, at 07:39 AM by 158.35.225.228 -
Added lines 1-28:
!! Van der Pol oscillator

The Van der Pol oscillator (named for Dutch physicist Balthasar van der Pol) is a type of nonconservative oscillator with nonlinear damping. It evolves in time according to the second order differential equation:

Attach:oscillator.gif

The van der Pol oscillator was originally ''discovered'' by the Dutch electrical engineer and physicist Balthasar van der Pol. Van der Pol found stable oscillations, now known as limit cycles, in electrical circuits employing vacuum tubes. When these circuits are driven near the limit cycle they become entrained, i.e. the driving signal pulls the current along with it. Van der Pol and his colleague van der Mark reported in the September 1927 issue of Nature that at certain drive frequencies an irregular noise was heard. This irregular noise was always heard near the natural entrainment frequencies. This was one of the first discovered instances of deterministic chaos.

----

!!! Model

* %list list-page% [[Attach:oscillator.apm | oscillator.apm]]

----

!!! Sample Results

!!!! Input

The oscillator is driven with a sine wave forcing function at 60 Hz and amplitude 1.

Attach:oscillator_driven.gif

!!!! Predictions

* %list list-page% (:html:)<a href="http://apmonitor.ath.cx/online/plot.php?d=oscillator&f=SV(2).xml">Signal</a>(:htmlend:)
* %list list-page% (:html:)<a href="http://apmonitor.ath.cx/online/plot.php?d=cells&f=SV(3).xml">Signal Derivative</a>(:htmlend:)