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Vibration and Noise in Fan Systems
4 other sections not shown
aerofoil air density air flow air velocity amplitude angle of attack atmospheric pressure attenuation axial flow fan backplate beam Bernoulli's equation blade angle calculated centrifugal fan coefficient components considered constant cross-sectional area curved fans deflection diagram direct stress discharge duct dynamic modulus efficiency equation fan and system fan characteristic fan impeller fan laws fan power fan pressure fan static pressure fan total pressure fan velocity pressure flow of air fluid forward curved gives homologous series impeller diameter inlet length lift force loss factor mass modulus motor natural vibration neutral axis number of blades octave band operation parallel plane pressure loss radial radius ratio residual characteristic resistance result rev/s shaft shear stress shown in Fig sound energy sound intensity level sound power level sound pressure level surface tangential temperature torque unit velocity triangles volume flow vortex whilst