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This resource explores the concepts of simple and damped harmonic oscillators, focusing on the equations of motion, potential and kinetic energy, and mass-spring systems. It details the behavior of oscillators under different damping conditions including underdamped, critically damped, and overdamped regimes. Additionally, the implications of driven harmonic oscillators are discussed, emphasizing transient versus steady-state behavior under external forces. The content integrates mathematical modeling with practical examples, enhancing comprehension of complex oscillatory motions.
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Physics 321 Hour 11 Simple and Damped Harmonic Oscillators
Find U and T Equilibrium Equation of motion ω, T Energy plot Mass on a Massless Spring y
y Assume Find U and T Equation of motion ω, T x A Shallow Frictionless Bowl z
y Assume Find U and T Newton’s Equations x Another Bowl z
Lissajous.nb Example
The equation: A little rearranging: Damped Oscillator A trial solution:
Underdamped: • Critically damped: • Overdamped: Three Regimes
Solution: or Underdamped
Solution: Overdamped
Solution: Critically Damped
DampOsc5_4.nb Example
Physics 321 Hour 12 Driven Harmonic Oscillators
The equation: Let The oscillator wants to oscillate at but the driver forces it to oscillate at . This leads to transient vs steady state behavior! Driven Oscillator
Driven_Osc.nb Example
We assume a solution something like But So we employ a trick… The driving force is the real part of Driven Oscillator
We assume a solution of the form This gives: Driven Oscillator
Conclusion 1: Driven Oscillator
Real parts: Imaginary parts: Driven Oscillator
Conclusion 2: And finally the steady state solution is: Driven Oscillator