Experimental study of friction noise of dry contact under light load
نویسندگان
چکیده
This study is concerned with the measurement of friction noise radiated from the contact area of two sliding solids. The domain of interest is dry contact under light pressure where the roughness of surfaces is of a great importance. The modal properties of solids, explained by a numerical modal analysis, behave like a filter applied to the excitation signal. The friction mechanism is characterized by two effects. The contact stiffness coupling opposite pieces is determined by measuring the eigenfrequency shift. And the level of frictional forces is determined from measurement of power spectrum density of acceleration by deconvolution. RÉSUMÉ. Cette étude concerne la mesure du bruit de frottement émis par la zone de contact de deux solides en mouvement. Le domaine exploré est celui du contact sec sous faible pression où la rugosité joue un rôle essentiel. Les propriétés modales des solides, connues par une analyse modale numérique, se comportent comme un filtre appliqué au signal d’excitation. Le mécanisme de friction est caractérisé par deux effets. La raideur de contact entre les pièces opposées est déterminée par le décalage des fréquences propres. Et le niveau des forces de friction est déterminé par déconvolution à partir des mesures de densité spectrale de puissance d’accélération.
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