of dissipative, film‐lined, and reac...Figure 13.56 Attenuation (dB) at duct termination due to end reflection loss...Figure 13.57 This shows the expected “end reflection” losses for rectangular...Figure 13.58 This shows the attenuation observed in mitre bends in ducts whe...Figure 13.59 Attenuation of rectangular elbows with and without turning vane...Figure 13.60 Attenuation of rectangular and radius elbows (lined and unlined...Figure 13.61 Velocity‐generated sound of duct mitre elbows [20]. Note: Compa...Figure 13.62 A‐weighted sound pressure levels measured 1.5 m (5 ft) from sur...Figure 13.63 (a) Proper and improper airflow condition to an outlet; (b) eff...Figure 13.64 Typical generated sound pressure levels vs. flow velocity for s...Figure 13.65 This figure can be used to estimate generated sound pressure le...Figure 13.66 The effect of installing a damper behind a grille; (a) Without ...Figure 13.67 The effect of partially closing a damper on a 50 cm × 50 cm (20...Figure 13.68 Velocity‐generated sound of 60 cm by 60 cm volume damper [20]. ...Figure 13.69 If possible, dampers should be placed well back behind outlet g...Figure 13.70 Duct breakout.Figure 13.71 Duct breakin.Figure 13.72 Typical radiated sound power levels for dual‐inlet mixing boxes...Figure 13.73 Effect on radiated sound power level of applying a layer of 1/6...Figure 13.74 HVAC systems for an office block. Dimensions are in mm.14 Chapter 14Figure 14.1 Location of sources of power plant, tire, and wind noise on an a...Figure 14.2 A‐weighted vehicle sound pressure level, SPL, at constant speeds...Figure 14.3 Exterior sound pressure level, SPL, of a Volvo F12 truck under d...Figure 14.4 Comparison of A‐weighted radiated sound power level for a stiff ...Figure 14.5 Definitions of muffler performance.Figure 14.6 View of finished CPX trailer built at Auburn University [20].Figure 14.7 A‐weighted one‐third octave band sound pressure level tire/road ...Figure 14.8 Some locations of sound sources on an automobile body. Type (a) ...Figure 14.9 Locations in a typical automobile where damping treatments are o...Figure 14.10 A‐weighted sound pressure levels obtained during stationary eng...Figure 14.11 Wind noise at driver's ear location and speed of 180 km/h in ve...Figure 14.12 Dashboard panel made of laminated vibration damped steel [40]....Figure 14.13 Typical locations in an automobile where “barrier” materials ar...Figure 14.14 Typical locations in an automobile where sound‐absorbing materi...Figure 14.15 Operator cabin of an agricultural harvester machine [72].Figure 14.16 Measured and predicted agricultural cabin sound insertion loss ...Figure 14.17 Noise and vibration sources in a railroad car [88].Figure 14.18 Interior sound pressure level as a function of train speed, V [...Figure 14.19 Comparison of floor vibration levels for solid wheel and low‐no...Figure 14.20 Comparison of interior noise levels for solid wheel and low‐noi...Figure 14.21 Source/path acoustical model [98].Figure 14.22 Percentage of passengers choosing various criteria needing impr...
15 Chapter 15Figure 15.1 Dominant turbofan engine noise sources [4].Figure 15.2 Noise levels and spectra of general aviation aircraft [7].Figure 15.3 Sound pressure level spectrum for typical cabin noise in a turbo...Figure 15.4 Main rotor head kinematics [11].Figure 15.5 Stacked constrained layer damper system [15].Figure 15.6 Interior of fuselage skin showing pockets between the stringers ...Figure 15.7 Use of constrained layer damping with an aircraft stringer [15]....Figure 15.8 Active control of aircraft interior noise: (a) active noise cont...Figure 15.9 Certification limits for aircraft [38].
16 Chapter 16Figure 16.1 Synthesis of all the clustering survey results. The mean of the ...Figure 16.2 Percentage highly annoyed persons (%HA) as a function of DNL. Tw...Figure 16.3 A‐weighted sound pressure levels of cars and light and heavy tru...Figure 16.4 Cruise‐by exterior A‐weighted sound pressure levels measured at ...Figure 16.5 Measurement positions used for cruise‐by or acceleration noise tests.Figure 16.6 Noise levels and spectra of wide‐body fanjet aircraft (e.g. the ...Figure 16.7 Measurement locations for certification testing of aircraft to F...Figure 16.8 Predicted values of the attenuation provided by a 1 m wide earth...Figure 16.9 Definition of four zones according to a city plan and the corres...Figure 16.10 Typical noise contours for an airport [44].
Guide
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2 Table of Contents
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