HW 2_06 Fall - Acoustics I HW 2 Fall Qt. 2006 Due Date:...

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Acoustics I HW 2 Fall Qt. 2006 Due Date: 10/16 Problem1 : 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 f Z ± Find 1 x ² ± . Find 2 x ² ± Find the power dissipated at the foundation. ( ) Z 12 / f jNsm =− ± 100 100 jt f eN = ± 1000 / sN m = 1 x ± 2 x ±
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Problem 3 The equation of motion of the longitudinally vibrating rod (i.e., vibrating in the axial
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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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HW 2_06 Fall - Acoustics I HW 2 Fall Qt. 2006 Due Date:...

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