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9781402007651

Iutam Symposium on Designing for Quietness

by ;
  • ISBN13:

    9781402007651

  • ISBN10:

    1402007655

  • Format: Hardcover
  • Copyright: 2002-08-01
  • Publisher: Kluwer Academic Pub

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Supplemental Materials

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Summary

It is well known that noise control at the source is the most cost-effective. Designing for quietness is therefore the most important concept in Engineering Acoustics or Technical Acoustics. The IUTAM Symposium on Designing for Quietness held at the Indian Institute of Science Bangalore in December 2000, was probably the first on this topic anywhere in the world. Papers were invited from reputed researchers and professionals spread over several countries. 18 of the 21 papers presented in the Symposium are included in these proceedings after rigorous review, revision and editing. This volume covers a large number of applications, such as silencers, lined ducts, acoustic materials, source characterization, acoustical design of vehicle cabs, ships, space antennas, MEMS pressure transducer etc., active control of structure-borne noise and cavities, SEA for engine noise and structural acoustic modelling with application to design of quieter panels.A list of references at the end of every paper will provide sources for further reading.

Table of Contents

Preface xiii
Contributing Authors xv
Analysis and Design of an Annular Airgap Lined Duct for Hot Exhaust Systems
1(20)
M. L. Munjal
B. Venkatesham
Introduction
1(2)
The Governing Equations
3(3)
Solution of the Governing Equations
6(2)
Derivation of the Transfer Matrix
8(1)
Validation
9(3)
Parametric Studies
12(4)
Concluding Remarks
16(5)
References
19(2)
Acoustical Materials for Automotive NVH Reduction
21(12)
A. R. Mohanty
Introduction
21(1)
Sound Absorption Co-efficient
22(1)
Transmission Loss
23(2)
Results
25(3)
Conclusions
28(5)
References
31(2)
Acoustic Characterization of One-Port Sources and Its Aplication to Duct Noise Control System Design
33(14)
M. G. Prasad
Introduction
33(1)
System Model
33(3)
Source Characteristics
36(1)
Direct Methods
36(2)
Indirect Methods
38(2)
System Performance
40(4)
Concluding Remarks
44(3)
References
45(2)
Theoretical and Experimental Studies of the Acoustical Design of Vehicle Cabs--A Review of Truck Noise Sources and Cab Design Using Statistical Energy Analysis
47(20)
M. J. Crocker
A. R. Patil
J. P. Arenas
Introduction
47(2)
Noise and vibration sources in heavy vehicles
49(4)
SEA and its use in automotive heavy vehicle cab design
53(7)
SEA model
55(2)
Resonant and non-resonant transmission
57(2)
Effect of system parameters
59(1)
Total attenuation of an enclosure
60(1)
Optimization of enclosure attenuation
60(3)
Conclusions
63(4)
References
65(2)
Disturbance Damping of an Unfolded Space Mirror
67(12)
V. I. Bujakas
Deployable petal-type space antennas
67(2)
Kinematic scheme of the unfolded design
69(2)
Mathematical model of petal-type structure dynamics
71(1)
Disturbed motion of the frame
72(1)
The damping of frame disturbances
73(2)
Dynamics of the reflecting surface
75(1)
Conclusion
75(4)
References
77(2)
In Pursuit of Quieter Ship Design
79(20)
V. Bhujanga Rao
Introduction
79(2)
Acoustical Design Considerations
81(13)
Noise limiting curves
81(1)
Noise level prediction models
81(3)
Acoustic quieting techniques
84(1)
Model experiments
84(1)
Involvement of shipbuilding yards
85(1)
Full scale noise measurements
85(1)
Structural design to overcome transmission paths
86(1)
Vibration Isolation
87(1)
Double Stage Mounting System with Acoustic Enclosure
87(1)
Propeller noise
87(2)
Radiation from hull structure
89(1)
Structureborne sound due to acoustic excitation and transmission to adjacent compartments
90(1)
Noise transmitted between compartments
91(1)
Ventilation Noise
91(1)
Acoustic Enclosures
92(1)
Flow Noise
93(1)
Acoustical design scheme of a ship
93(1)
Concluding Remarks
94(5)
References
97(2)
Active Control of Structure-Borne Noise in Helicopter Cabin Transmitted Through Gearbox Support Strut
99(30)
S. Gopalakrishnan
D. Roy Mahapatra
Introduction
100(4)
Active Local Control for Structural Wave Guides
103(1)
Modeling the Mechanics of Finite-Length Cylindrical Strut
104(6)
Active Strut with Magnetostrictive Actuators
105(1)
Kinematics and Equations of Motion for the Cylindrical Strut Segment
106(4)
Spectral Analysis and Characteristic Wave motion
110(2)
Active Spectral Element Model (ASEM)
112(4)
Spectral Element for Finite-Length Strut
113(1)
Sensor Element and Actuator Input
114(1)
Actuator Element
115(1)
Case Studies
116(9)
Control of Axial Wave Transmission
116(5)
Control of Axial-Flexural Coupled Wave Transmission
121(4)
Concluding Remarks
125(4)
References
127(2)
Active Noise Control In Acoustic Cavities With Flexible Walls
129(18)
S. Narayanan
C. Padmanabhan
Introduction
129(2)
Analytical Formulation for Rectangular Enclosure
131(2)
Finite Element Formulation for Cylindrical Cavity
133(4)
Shell Structure Model
133(2)
Acoustic Model
135(1)
Structural-Acoustic Coupling
136(1)
Results
137(3)
Conclusions
140(7)
References
145(2)
Sea for Diesel Engine Transfer Path
147(20)
Dhanesh N. Manik
Parag H. Mathuria
Literature Survey
149(1)
Theory
150(1)
Application of SEA
151(3)
System Model
151(1)
Subsystem parameters
152(1)
SEA Model
153(1)
Experimental Setup
154(2)
Modal density
154(1)
Damping loss factor
154(2)
Coupling loss factor
156(1)
Results and Discussion
156(4)
Conclusions
160(7)
Appendix
162(3)
References
165(2)
An Environmental Impact Assessment of a Projected Airport Noise
167(14)
K. Konishi
Z. Maekawa
Introduction
167(1)
Outline of Measurement of Noise Propagation
168(3)
Measurement Site And The Measuring Measuring System
168(1)
Measured Results For Noise Reduction
169(2)
Excess Attenuation Measured In 1/3 Octave Band Noise
171(1)
Estimated Excess Attenuation For Aircraft Noise
172(2)
Estimation of Aircraft Noise
172(1)
Time Distribution of Excess Attenuation For Estimated Aircraft Noise
173(1)
Percentage Distribution of Estimated Excess Attenuation For craft noise
173(1)
Discussions
174(7)
Long Range Noise Propagation and Meteorological Conditions
174(2)
Computation Of The Long Range Noise Propagation
176(1)
Concluding Remarks
176(1)
Appendix
176(3)
References
179(2)
Dynamics of Hearing - Sensitivity to Noise
181(20)
Albrecht Eiber
Werner Schiehlen
Sound Perception and Hearing Process
182(1)
Mechanical Model of the Middle Ear
183(4)
Risks, Evaluation, Assessment
187(3)
Applications
190(5)
Transient sound
190(3)
Harmonic sound
193(1)
Reconstructed ears
194(1)
Conclusions
195(6)
References
199(2)
Design of a Mems Pressure Sensor for Acoustic Applications
201(14)
Rudra Pratap
Yash K. Dungerpuria
Introduction
201(1)
Sensor Design
202(2)
Damping in the design
204(2)
Structural damping
205(1)
Squeeze film damping
205(1)
Results and Discussion
206(4)
Conclusions
210(5)
References
213(2)
Reducing Radiated Sound Power By Minimizing the Dynamic Compliance
215(22)
C. S. Jog
Introduction
215(3)
The Dynamic Compliance
218(4)
Numerical Examples
222(11)
Conclusions
233(4)
References
235(2)
Compressor Related Noise Control in Air-Conditioners and Refrigerators
237(10)
S. Manivasagam
J. Senthilnathan
Introduction
237(1)
Noise Mechanism in Hermetic Compressors
238(1)
Compressor Noise Control Techniques
238(5)
Balance of Rotating and Reciprocating Masses
238(1)
Attenuation of Gas Pulsating by Using Efficient Mufflers
238(3)
Isolation/Suspension
241(1)
Noise Control by Shell Redesign
242(1)
Appliance Noise Control
243(1)
Conclusion
244(1)
Acknowledgements
245(2)
References
246(1)
An Experimental Verification of Structural-Acoustic Modeling and Design Optimization
247(32)
H.-J. Beer
J. Gier
H.-J. Hardtke
S. Marburg
F. Perret
R. Rennert
The Problem
248(2)
Model Description
250(6)
Physical Model
250(3)
Simulation Model
253(3)
Experimental and Simulated Modal Analysis
256(2)
Structural and Noise Transfer Functions
258(7)
Structural Transfer Function
258(3)
Noise Transfer Function
261(4)
Verification of the Simulation Model
265(2)
Optimization of the structure
267(7)
Feasible Modifications
267(1)
Design Parameters and Objective Function
268(2)
Optimized Design and its Mode Shapes
270(2)
Noise Transfer and Objective Functions of Optimized Design
272(2)
Final Remarks
274(5)
References
277(2)
An Optimization Technique in Structural-Acoustic Design of Sedan Body Panels
279(20)
Steffen Marburg
Hans-Jurgen Hardtke
The problem
279(4)
Noise transfer function
283(5)
General considerations
283(1)
Structural analysis
284(1)
Acoustic analysis
285(2)
Coupling of structure and fluid model
287(1)
Design parameters
288(2)
Objective function
290(1)
Sensitivity analysis
290(1)
Applications
291(8)
References
295(4)
How Noise Control Improves Health
299(14)
Deepak Prasher
Scale of the Problem of Noise
299(1)
Noise and Hearing
300(1)
Occupational Noise Exposure: Legal Thresholds
301(1)
Susceptibility to noise induced hearing loss
302(2)
Environmental Noise and Effects
304(1)
Noise and Annoyance
304(1)
Noise and Sleep
305(1)
Noise and Performance
306(1)
Noise Stress and Hormones
306(1)
Noise and Cardiovascular Effects
307(1)
Noise and Mental Health
307(1)
Noise and Fatigue
308(1)
Noise Effects in Children
308(1)
Noise Control and Health
308(5)
References
311(2)
Transmission and Absorption - Predictions and Performance
313(12)
R. J. Hooker
Introduction
313(1)
Transmission
313(3)
Prediction
314(1)
Performance
314(2)
Absorption
316(5)
Prediction
316(2)
Performance
318(3)
Conclusion
321(4)
References
323(2)
Index 325

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