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Types of vibration

Any type of vibration can be defined by the pattern of displacement of the particle over time http://monet.physik.unibas.ch/~elmer/pendulum/spend.htm. Types of vibration. Based on time Periodic: Pattern of vibration repeats regularly over time

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Types of vibration

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  1. Any type of vibration can be defined by the pattern of displacement of the particle over timehttp://monet.physik.unibas.ch/~elmer/pendulum/spend.htm

  2. Types of vibration • Based on time • Periodic: Pattern of vibration repeats regularly over time http://monet.physik.unibas.ch/~elmer/pendulum/spend.htm • Non-periodic: No regular pattern of vibration

  3. Based on the number of components • Simple: Only one pattern of vibration • Complex: More than one pattern of vibration

  4. Sinusoids/Sine waves/Pure tones • Simple wave • A single pattern of vibration • Periodic in nature http://library.thinkquest.org/19537/?tqskip1=1

  5. Properties of a sine wave • Amplitude • Frequency • Starting phase

  6. Amplitude • Related to displacement of the particle http://monet.physik.unibas.ch/~elmer/pendulum/spend.htm • Can be described in several ways • Instantaneous amplitude • Peak amplitude • Peak-to-peak amplitude • RMS amplitude

  7. What is the instantaneous amplitude of this wave at a) 0 s, b) 0.015 s, c) 0.25 s, and d) 0.07 s?

  8. What is the peak amplitude? What is the peak-peak amplitude?

  9. Root Mean Square (RMS) amplitude • Instantaneous amplitudes • Square these values • Mean (average) of the squared values • Square root of this mean

  10. Use the instantaneous amplitudes at 0, 0.125, 0.25, 0.375, and 0.5 seconds to calculate the RMS amplitude of the following wave.

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