Читать книгу Engineering Acoustics - Malcolm J. Crocker - Страница 3

1 Chapter 1Table 1.1 Preferred center frequencies for noise measurements according to IS...

2 Chapter 3Table 3.1 Models of idealized spherical sources: Monopole, Dipole, and Quadru...Table 3.2 Simple source near reflecting surfaces^a.Table 3.3 Frequencies (less than 100 Hz) for a 3.1 × 4.7 × 6.2 m³ rectangular...

3 Chapter 4Table 4.1 Octave band levels of factory noise and Stevens' loudness indices.Table 4.2 Combination of octave‐band sound pressure levels of factory noise t...Table 4.3 Male voice speech sound pressure levels +12 dB at 1 m from lips for...

4 Chapter 5Table 5.1 Effects of noise on health and wellbeing with sufficient evidence [...Table 5.2 Estimated excess risk of incurring material hearing impairment^a as ...Table 5.3 Time‐Weighted Average (TWA) noise level limits as a function of ...Table 5.4 Worker's A‐weighted noise level exposure record.Table 5.5 One‐octave‐band factory noise.Table 5.6 ACGIH recommended threshold limit values for hand‐transmitted vibra...

5 Chapter 6Table 6.1 Some acoustical and nonacoustical factors that contribute to annoya...Table 6.2 Sound level values for Example 6.1.Table 6.3 Data used in Example 6.8.Table 6.4 Recommended values of NCB curves for different uses of spaces in bu...Table 6.5 Guidelines from EPA [31], WHO [68], FICON [33], and various Europea...Table 6.6 Guidelines used in the United Kingdom for A‐weighted equivalent sou...Table 6.7 Vibration dose values (ms^−7/4) at which various degrees of ad...

6 Chapter 8Table 8.1 Sound power measurement by pressure vs. intensity techniques in var...Table 8.2 Comparison of overall sound power levels obtained by the sound inte...

7 Chapter 9Table 9.1 Passive noise control approaches that may be considered for source,...Table 9.2 Different formulas for the end correction factor.P is the open area...Table 9.3 Sound absorption coefficientα(f) and corresponding NRC of comm...Table 9.4 Change in noise reduction performance of enclosure as function of p...Table 9.5 Effectiveness of a partial enclosure.

8 Chapter 10Table 10.1 Basic elements and corresponding muffler components of two‐duct mo...Table 10.2 Basic elements and corresponding muffler components for three‐duct...Table 10.3 Symbols used by various authors in parallel‐baffle mufflers.Table 10.4 Calculated values of muffler attenuation from methods given in Sec...

9 Chapter 11Table 11.1 Effects of different gear design and manufacturing parameters on g...Table 11.2 Specific sound power levels, dB, in eight lowest one‐octave bands ...Table 11.3 Main sources of noise in electric motors [18].Table 11.4 One‐octave band level adjustments (dB) for small electric motors [...Table 11.5 One-octave band level adjustments (dB) for exterior noise levels r...Table 11.6 Prediction of the A‐weighted sound power level generated by differ...

10 Chapter 12Table 12.1 Representative transmission and impact isolation class data for wa...Table 12.2 Criteria for airborne sound insulation of wall partitions between ...Table 12.3 Criteria for airborne and impact sound insulation of floor/ceiling...Table 12.4 Criteria for airborne sound insulation within a dwelling unit.Table 12.5 Calculation of minimum partitionTL required to achieving NC‐40 in ...Table 12.6 Human acceleration acceptability criteria.

11 Chapter 13Table 13.1 Fan efficiency adjustment, i.e. the number of decibels by which th...Table 13.2 Estimated sound power level increases for different fan pressures ...Table 13.3 Fan sound power frequency spectrum corrections in dB [8].Table 13.4 Graham and Hoover calculation of the one‐octave band sound power o...Table 13.5 Fry calculation of the sound power levels, dB, of FC and BI fans.Table 13.6 Poor intake and discharge condition corrections [8].Table 13.7 Calculation of natural frequencyf_n and static deflection needed to...Table 13.8 Recommended minimum static deflections for vibration isolators use...Table 13.9 Comparison of material used for vibration isolators [27].Table 13.10 Predicted attenuation in Example 13.9.Table 13.11 In‐duct attenuation in unlined straight ducts [8].Table 13.12 In‐duct attenuation within externally lagged straight ducts [8].Table 13.13 Sound attenuation dB/m of unlined sheet metal ducts at one‐octave...Table 13.14 Predicted attenuation, dB, of a 610 mm × 610 mm unlined, 10 m lon...Table 13.15 Predicted attenuation in decibels of a 610 mm × 610 mm lined, 6 m...Table 13.16 Calculated attenuation values in decibels for 10 m long duct in E...Table 13.17 End reflections, dB, obtained from Figures 13.56 and 13.57.Table 13.18 Attenuation (dB) of unlined mitre bends. Attenuation is given for...Table 13.19 Attenuation in decibels of lined mitre bends [8].Table 13.20 Sound pressure level predictions for breakout noise in Example 13...Table 13.21 Sound pressure level, dB, predicted in Example 13.15.

12 Chapter 14Table 14.1 Comparison of rolling and power train A‐weighted sound pressure le...Table 14.2 A‐weighted sound pressure levels from pass‐by measurements of two ...Table 14.3 Automotive applications [39].

13 Chapter 15Table 15.1 Possible airport actions to abate noise [43].Table 15.2 Data for an aircraft noise event of five seconds.Table 15.3 A‐weighted aircraft noise level events in an airport.

14 Chapter 16Table 16.1 Penalties for aircraft noise applied by ANSI to original Schultz c...Table 16.2 Example of a community noise ordinance.Table 16.3 Data used in Example 16.2.