Inter-noise: ProceedingsAustralian Acoustical Society, 1988 - Noise control |
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Page 206
... mode given by sin ( mπл2 / L ) . Еach n value corresponds to the circumferential mode number , given by cos ( no ) . This frequency is between two modes , ( 2,4 ) mode , ( the first index is m , the second n ) , at 1504 Hz and the ...
... mode given by sin ( mπл2 / L ) . Еach n value corresponds to the circumferential mode number , given by cos ( no ) . This frequency is between two modes , ( 2,4 ) mode , ( the first index is m , the second n ) , at 1504 Hz and the ...
Page 1005
... mode is the dominant acoustic mode due to the filtering effect of the coupling mechanism2 . However , the presence of a significant n = 4 mode response in the shell is responsible for the higher order variations in the radial acoustic ...
... mode is the dominant acoustic mode due to the filtering effect of the coupling mechanism2 . However , the presence of a significant n = 4 mode response in the shell is responsible for the higher order variations in the radial acoustic ...
Page 1006
... mode , significantly lowering the input impedance of the cavity to this mode , which reduces the energy that may be loaded into it from the shell vibration . The cavity impedance for the residual n = 4 mode is not significantly ...
... mode , significantly lowering the input impedance of the cavity to this mode , which reduces the energy that may be loaded into it from the shell vibration . The cavity impedance for the residual n = 4 mode is not significantly ...
Contents
DISTINGUISHED LECTURES | 1 |
Speed related noise in land transport | 21 |
ANALYSIS 70 | 31 |
Copyright | |
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A-weighted accelerometer acoustic intensity active intensity amplitude analysis applied axial blade calculated centrifugal fans coefficient coherence components compressor coupling cylinder damping dB(A density determined duct dynamic effect energy Engineering equation estimated excitation experimental filter finite element method fluid force Frequency Hz frequency range function gear holography impact impedance input intensity measurements inter-noise 88 machine matrix mechanical method microphone modal mode motor nearfield noise control noise level noise reduction noise sources obtained octave octave band output panel parameters particle phase plane power flow predicted problem propagation pump radiation efficiency reception plate resonance reverberation rotating shell shown in Figure shows signal sound field sound intensity sound level sound level meter sound power level sound pressure level sound source spectra spectrum speed Statistical Energy Analysis structure structure-borne surface technique transducers turbulent values vector velocity vibration wave wavenumber