HW 2_06 Fall

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

This preview shows pages 1–2. Sign up to view the full content.

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 ±

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Problem 3 The equation of motion of the longitudinally vibrating rod (i.e., vibrating in the axial
This is the end of the preview. Sign up to access the rest of the document.

## 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.

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online