Solution to HW 2_2006 Fall

# Solution to HW - Problem 3 The equation of motion of the longitudinally vibrating rod(i.e vibrating in the axial direction is give as where p and E

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Acoustics J HW2 Fall Qt. 2006 Due Date: 1011 6 Probleml: In a manufacturing plant, SPL is measured 90 dB when 20 identical machines that generate relatively steady-state. broad-band noise are operating. The background noise level is measured 70 dB when no machine is in operation. Find the noise level when only 5 of the machines are operating assuming with the same background noise. Problem 2: A massless spring attached to the foundation is excited by a harmonic force as shown in the figure. The impedance defined by impedance Z, - Find i,. Find i, Find the power dissipated at the foundation.

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Unformatted text preview: Problem 3 The equation of motion of the longitudinally vibrating rod (i.e., vibrating in the axial direction) is give as: where, p and E are density and Young's modulus of the material of the rod and ii is the &lacement at a point of the rod. The stress and displacement relation ship is: au E- - a ax Find the wave speed in the rod. A rod with fixed-free boundary conditions is shown below. Suppose we have a displacement wave traveling as shown. Sketch the shape of the wave that will be - reflected from the free end....
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## This note was uploaded on 10/19/2009 for the course MECH 666 taught by Professor Kim during the Fall '07 term at University of Cincinnati.

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Solution to HW - Problem 3 The equation of motion of the longitudinally vibrating rod(i.e vibrating in the axial direction is give as where p and E

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