World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Engineering Acoustics

By Wikibooks Contributors

Click here to view

Book Id: WPLBN0000662830
Format Type: PDF eBook
File Size: 3.17 MB.
Reproduction Date: 2005

Title: Engineering Acoustics  
Author: Wikibooks Contributors
Volume:
Language: English
Subject: Reference materials, Reference books, Reference & resource series
Collections: WikiBooks Collection
Historic
Publication Date:
Publisher: WikiBooks

Citation

APA MLA Chicago

Contributors, W. (n.d.). Engineering Acoustics. Retrieved from http://hawaiilibrary.net/


Description
Text Books

Excerpt
Excerpt: Forced Oscillations (Simple Spring-Mass System) Recap of Section 1.3 In the previous section, we discussed how adding a damping component (e. g. a dashpot) to an unforced, simple spring-mass system would affect the response of the system. In particular, we learned that adding the dashpot to the system changed the natural frequency of the system from to a new damped natural frequency , and how this change made the response of the system change from a constant sinusoidal response to an exponentially-decaying sinusoid in which the system either had an under-damped, over-damped, or critically-damped response.

Table of Contents
CONTRIBUTORS ........................................................................................................................................................6 PART 1: LUMPED ACOUSTICAL SYSTEMS ...............................................................................................................7 SIMPLE OSCILLATION ...............................................................................................................................................7 Solving for the Position Equation ........................................................................................................................7 Alternate Position Equation Forms ......................................................................................................................9 FORCED OSCILLATIONS(SIMPLE SPRING-MASS SYSTEM)........................................................................................10 MECHANICAL RESISTANCE.....................................................................................................................................19 Mechanical Resistance ......................................................................................................................................19 Dashpots............................................................................................................................................................19 Modeling the Damped Oscillator .......................................................................................................................20 Mechanical Impedance for Damped Oscillator..................................................................................................21 CHARACTERIZING DAMPED MECHANICAL SYSTEMS...............................................................................................22 Characterizing Damped Mechanical Systems ....................................................................................................22 Calculating the Mechanical Resistance..............................................................................................................22 Critical Damping...............................................................................................................................................22 Damping Ratio ..................................................................................................................................................22 Quality Factor ...................................................................................................................................................23 ELECTRO-MECHANICAL ANALOGIES......................................................................................................................24 Why analogs to circuits? ...................................................................................................................................24 Two possible analogies .....................................................................................................................................24 The equivalent spring........................................................................................................................................24 The equivalent Mass .........................................................................................................................................25 The equivalent resistance ..................................................................................................................................25 Review of Circuit Solving Methods...................................................................................................................25 ADDITIONAL RESOURCES FOR SOLVING LINEAR CIRCUITS:......................................................................................26 METHODS FOR CHECKING ELECTRO-MECHANICAL ANALOGIES..............................................................................27 1. Low-Frequency Limits:.................................................................................................................................27 2. Dot Method: (Valid only for planar network) ................................................................................................27 EXAMPLES OF ELECTRO-MECHANICAL ANALOGIES................................................................................................28 Example 1 .........................................................................................................................................................28 Example 1 Solution...........................................................................................................................................28 Example 2 .........................................................................................................................................................29 Example 2 Solution...........................................................................................................................................30 Example 3 .........................................................................................................................................................31 PRIMARY VARIABLES OF INTEREST ..........................................................................................................................34 Basic Assumptions ............................................................................................................................................34 Variables of interest ..........................................................................................................................................35 ELECTRO-ACOUSTIC ANALOGIES .............................................................................................................................37 Electro-acoustical Analogies.............................................................................................................................37 TRANSDUCERS - LOUDSPEAKER ..............................................................................................................................48 Acoustic Transducer..........................................................................................................................................48 Magnet Motor Drive System.............................................................................................................................48 Loudspeaker Cone System................................................................................................................................48 Loudspeaker Suspension...................................................................................................................................48 MOVING RESONATORS ...........................................................................................................................................48 Moving Resonators ...........................................................................................................................................48 Example ............................................................................................................................................................50 PART 2: ONE-DIMENSIONAL WAVE MOTION.......................................................................................................51 TRANSVERSE VIBRATIONS OF STRINGS ....................................................................................................................51 Introduction.......................................................................................................................................................51 What is a wave equation?..................................................................................................................................51 One dimensional Case.......................................................................................................................................51

 

Click To View

Additional Books


  • Moondyne; A Story of Convict Life in Aus... (by )
  • Injuries and Diseases of the Knee-Joint (by )
  • A History of Political Theories from Lut... (by )
  • History of Australia (by )
  • Reference Guides That Should Be Known an... (by )
  • Reference Guides That Should Be Known an... (by )
  • Reference Guides That Should Be Known an... Volume Part: 4 (by )
  • Reference Catalogue of the Reynolds Libr... (by )
  • The Practical Use of Books and Libraries... (by )
  • The Practical Use of Books and Libraries... (by )
  • The Practical Use of Books and Libraries... (by )
  • The Practical Use of Books and Libraries... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.