Sound radiation from vibrating cooling ribs

Martti Verho, Paul Klinge

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

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.
Original languageEnglish
Title of host publicationModelling and simulation of multitechnological machine systems
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages45-54
ISBN (Electronic)951-38-5713-1
ISBN (Print)951-38-5712-3
Publication statusPublished - 2001
MoE publication typeA4 Article in a conference publication
EventModelling and simulation of multitechnological machine systems - Espoo , Finland
Duration: 30 Nov 200030 Nov 2000

Publication series

NameVTT Symposium
PublisherVTT
Number209
ISSN (Print)0357-9387
ISSN (Electronic)1455-0873

Seminar

SeminarModelling and simulation of multitechnological machine systems
CountryFinland
CityEspoo
Period30/11/0030/11/00

Fingerprint

magnification
cooling
acoustics
radiation
electric motors
radiators

Cite this

Verho, M., & Klinge, P. (2001). Sound radiation from vibrating cooling ribs. In Modelling and simulation of multitechnological machine systems (pp. 45-54). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 209
Verho, Martti ; Klinge, Paul. / Sound radiation from vibrating cooling ribs. Modelling and simulation of multitechnological machine systems. Espoo : VTT Technical Research Centre of Finland, 2001. pp. 45-54 (VTT Symposium; No. 209).
@inproceedings{cbf4f38e91254840833288e00e0b4110,
title = "Sound radiation from vibrating cooling ribs",
abstract = "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.",
author = "Martti Verho and Paul Klinge",
year = "2001",
language = "English",
isbn = "951-38-5712-3",
series = "VTT Symposium",
publisher = "VTT Technical Research Centre of Finland",
number = "209",
pages = "45--54",
booktitle = "Modelling and simulation of multitechnological machine systems",
address = "Finland",

}

Verho, M & Klinge, P 2001, Sound radiation from vibrating cooling ribs. in Modelling and simulation of multitechnological machine systems. VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 209, pp. 45-54, Modelling and simulation of multitechnological machine systems, Espoo , Finland, 30/11/00.

Sound radiation from vibrating cooling ribs. / Verho, Martti; Klinge, Paul.

Modelling and simulation of multitechnological machine systems. Espoo : VTT Technical Research Centre of Finland, 2001. p. 45-54 (VTT Symposium; No. 209).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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

ER -

Verho M, Klinge P. Sound radiation from vibrating cooling ribs. In Modelling and simulation of multitechnological machine systems. Espoo: VTT Technical Research Centre of Finland. 2001. p. 45-54. (VTT Symposium; No. 209).