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Free and Driven Oscillations of a Torsional Pendulum (Pohl's Wheel)

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check if the original torsional oscillator the by used for exciting the oscillations is held fixed and the free damped oscillation is shown Chu
now the bar is moved initially slowly then with a higher frequency
but but the amplitude of the oscillator is growing but
I think now a torsional
oscillator developed by Rudolf hills for optical projection will be used to
demonstrate some of the properties all driven
oscillations we begin with the free damped oscillation the
eddy-current break is increased in 2 steps the oscillations decrease more rapidly as the
damping is increased now the
periodic excitation with constant amplitude is turned on at a small frequency of the oscillator oscillates with a small amplitude oscillator and exciting force are in phase the oscillator with small
damping is now driven at its
resonance frequency the scale on the
left indicates the frequency the amplitude increases but only very slowly the oscillator and the exciting force on no longer in phase as the frequency is
increased the amplitude decreases again the long time needed to reach the steady state will be shown next to uh it takes almost 1 minute to reach this state the amplitude is again small and exciting false leads the motion of the oscillator by 180 degrees the frequency of excitation is
lowered again to the resonant frequency the amplitude grows again but it before reaching the steady state the damping is increased in
2 steps which reduces the time to reach the steady state and also decreases the amplitude here it shows that at the resonant frequency of the exciting false leads the oscillation by 90 degrees so if
Negativer Widerstand
Pendel
Organische Solarzelle
Lenkrad
Besprechung/Interview
Tonfrequenz
Computeranimation
Amplitude
Greiffinger
Optik
Torsionswaage
Computeranimation
Negativer Widerstand
Negativer Widerstand
Abwrackwerft
Angeregtes Atom
Umlaufzeit
Schwingungsphase
Tonfrequenz
Amplitude
Druckkraft
Massenresonanz
Maßstab <Messtechnik>
Besprechung/Interview
Angeregtes Atom
Schwingungsphase
Tonfrequenz
Proof <Graphische Technik>
Amplitude
Minute
Druckkraft
Massenresonanz
Proof <Graphische Technik>
Amplitude

Metadaten

Formale Metadaten

Titel Free and Driven Oscillations of a Torsional Pendulum (Pohl's Wheel)
Alternativer Titel Freie und erzwungene Schwingungen eines Drehpendels (Pohlsches Rad)
Serientitel The Physics Experiments of Robert Wichard Pohl (1884 - 1976)
Anzahl der Teile 62
Autor Lüders, Klaus
Pohl, Robert Otto
Beuermann, Gustav
Samwer, Konrad
Mitwirkende Stickan, Walter (Redaktion)
Lechner, Kuno (Kamera)
Gerstenberg, Thomas (Ton)
Yousefpour, Abbas (Schnitt)
Lizenz CC-Namensnennung - keine Bearbeitung 3.0 Deutschland:
Sie dürfen das Werk in unveränderter Form zu jedem legalen Zweck nutzen, vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen.
DOI 10.3203/IWF/C-14837eng
IWF-Signatur C 14837
Herausgeber IWF (Göttingen)
Erscheinungsjahr 2003
Sprache Englisch
Produzent IWF (Göttingen)
Produktionsjahr 2002

Technische Metadaten

IWF-Filmdaten Video-Clip ; F, 4 min 48 sec

Inhaltliche Metadaten

Fachgebiet Physik
Abstract Basic properties of harmonic oscillators on a torsional pendulum, specifically their free and driven oscillations. For the latter, the transient oscillations will be shown, before the steady state has been reached. The torsional pendulum consists of a circular copper ring with an eddy current brake, and a torsional spring. One end of the spring is attached to the copper ring, the other end to a motor via an eccentric-and-rod mechanism. For the experiment, another pendulum, also specifically designed for lecture demonstrations, will be used. It sits on an optical bench and is projected onto the front wall of the lecture hall, together with a meter indicating the exciting frequencies used for the driven oscillations. Two pointers, one attached to the pendulum, the other to the eccentric-and-rod mechanism used for moving the spring, allow observation of the phase difference between the exciting torque and the angular displacement of the pendulum.
Schlagwörter mechanics
harmonic oscillator
torsional pendulum
Pohl's wheel
damped oscillations
free and driven oscillations
resonance

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