Industrial Noise and Vibration Solution for Session 2 Physical Acoustics

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Presentation transcript:

Industrial Noise and Vibration Solution for Session 2 Physical Acoustics

Answer (example (1)) If the displacement of the particles of the medium is described by : What is the amplitude, frequency,wavelength and wave number and what is the speed of the wave? Solution: From the above equation the amplitude is m

Answer (example (2)) The pressure fluctuations in air are described by: What is the amplitude, frequency, wavelength and the speed of the wave. Solution:

Answer (example (3)) The pressure, p, is described by: If the pressure amplitude is 0.01 pa and at t=0, x=0 the value of p is pa find A r and A i. Solution: The expression for the pressure is: