TY - GEN
T1 - Sound radiation from vibrating cooling ribs
AU - Verho, Martti
AU - Klinge, Paul
PY - 2001
Y1 - 2001
N2 - The role of the cooling ribs seems to be important for
the noise created at the cover of an electric motor.
Relatively high peak velocities at the top of the ribs,
induced by simple mechanical amplification, can make the
ribs quite effective sound radiators. Based on a
simplified 2D-model, a cover with ribs radiates as
effectively as a flexible plate without ribs, if the peak
velocity at the top of the ribs is three times the
velocity of the plate. If the ribs are considered
non-flexible, the velocity magnification depends on the
height of the ribs. In the studied case, the
magnification factor was 3.7. If the dynamic effects of
flexible ribs are taken into account, the magnification
factor could be even higher. Measurements made on a
running motor seem to indicate that this level of
magnification is quite realistic.
AB - The role of the cooling ribs seems to be important for
the noise created at the cover of an electric motor.
Relatively high peak velocities at the top of the ribs,
induced by simple mechanical amplification, can make the
ribs quite effective sound radiators. Based on a
simplified 2D-model, a cover with ribs radiates as
effectively as a flexible plate without ribs, if the peak
velocity at the top of the ribs is three times the
velocity of the plate. If the ribs are considered
non-flexible, the velocity magnification depends on the
height of the ribs. In the studied case, the
magnification factor was 3.7. If the dynamic effects of
flexible ribs are taken into account, the magnification
factor could be even higher. Measurements made on a
running motor seem to indicate that this level of
magnification is quite realistic.
M3 - Conference article in proceedings
SN - 951-38-5712-3
T3 - VTT Symposium
SP - 45
EP - 54
BT - Modelling and simulation of multitechnological machine systems
PB - VTT Technical Research Centre of Finland
CY - Espoo
T2 - Modelling and simulation of multitechnological machine systems
Y2 - 30 November 2000 through 30 November 2000
ER -