THE SCIENCE AND APPLICATIONS OF ACOUSTICS - H. H. Arnold ...

406 14. Machinery Noise ControlHarris, Cyril M. (ed.). 1991. Handbook of Acoustical Measurements and Noise Control,3rd ed. New York: McGraw-Hill, Chapters 34–45.Hubbard, H. H. (ed.). 1995. Aerodynamics of Flight Vehicles: Theory and Practice, Vol. 1:Noise Sources, Vol. 2: Noise Control. Woodbury, NY: Acoustical Society of America.(A now classic compendium of theory and experimentation in the field of aeroacoustics,originally sponsored by the Aeroacoustics Technical Committee of the American Instituteof Aeronautics and Astronautics (AIAA) and reprinted by the American Instituteof Physics.)Jones, Dylan M. and Broadbent, Donald E. 1991. Human performance and noise. Handbookof Acoustical Measurements and Noise Control, 3rd ed. Harris, Cyril M. (ed.).New York: McGraw-Hill, Chapter 41.Lighthill, James M. 1952. On sound generated aerodynamically: I. General theory. Proceedingsof the Royal Society A 211:564–587. (A classic paper by the great master ofmodern aeroacoustics theory.)Lighthill, James M. 1978. Waves in Fluids. Cambridge: Cambridge University Press.(A veritable classic.)Magrab, E. B. 1975. Environmental Noise Control. New York: John Wiley and Sons.Nelson, P. A. and Elliott, S. J. 1992. Active Control of Sound. London: Academic Press.Nelson, P.A. and Elliott, S. J. 1997. Active Noise Control. In: Encyclopedia of Acoustics,Vol. 2. Crocker, Malcolm J. (ed.). New York: John Wiley & Sons, Chapter 84,pp. 1025–1037.Piraux, J. and Nayroles, B. 1980. A theoretical model for active noise attenuation in threedimensionalspace. Proceedings of Inter-Noise’80. Miami, FL: 703–708.Webb, J. D. (ed.). 1976. Noise Control in Industry. Sudbury, Suffolk, Great Britain: SoundResearch Laboratories Ltd.Problems for Chapter 141. A 6-blade fan rotates at 1150 rpm. Determine the frequencies of the noise thatwill emanate from the fan.2. Find the sound power of a fairly efficient electric motor rated at 85 hp at2400 rpm.3. Determine the frequency of the blade rate component of a diffuser-type compressorwith 24 blades in the rotor and 36 blades in the stator. The rotor rotatesat 9000 rpm.4. A 20-hp hydraulic screw-type pump operates at 1200 rpm with 4 chamberpressure cycles per revolution. Find its fundamental frequency and the soundpower output.5. A radial forward-curved fan has 36 blades and a rotor diameter of 120 cm. Itoperates at 950 rpm with an airflow rate of 24 m 3 /s under the effect of a totalpressure of 1.8 kPa. What is the total sound power at the inlet?6. Estimate the sound power of a “quiet” 100-hp electric motor operating at1200 rpm.7. A ball bearing has a stationary outer race. The inner and outer race diametersare 30 mm and 46 mm, respectively, measured at the point of ball contact. Theinner race rotates at 5200 rpm. There are 12 balls in the bearing. Determine