In aircraft engine the blade resonant vibration amplitude is reduced by increasing the structural damping by using, for example, tip shrouds. These devices dissipate the energy generated at the contact surfaces between the relative motion and the friction force. Contact parameters as friction coefficient and contact stiffness are required to characterize the dynamics of the shrouded blade systems. A test rig for contact parameters measurement of flat-on-flat contact surfaces has been developed. One of the specimens is attached to the rig frame, basically an inertial mass and four springs, excited by an electromagnetic shaker. The second specimen is allowed to approach the first specimen and to rotate in such a way the geometric contact between the two surfaces occurs on three points. In this way a real “flat-to-flat” contact has been obtained. The tangential contact force and the relative displacements between specimens are measured and the friction coefficient and contact stiffness are determined.
Macchina di prova ad accostamento libero ed alta temperatura per la microtribologia di superfici vibranti piane / Botto, Daniele; Lavella, Mario; Gola, Muzio. - ELETTRONICO. - (2011). (Intervento presentato al convegno AIAS – 40° Convegno Nazionale tenutosi a Palermo nel 7-10 Settembre 2011).
Macchina di prova ad accostamento libero ed alta temperatura per la microtribologia di superfici vibranti piane
BOTTO, DANIELE;LAVELLA, MARIO;GOLA, Muzio
2011
Abstract
In aircraft engine the blade resonant vibration amplitude is reduced by increasing the structural damping by using, for example, tip shrouds. These devices dissipate the energy generated at the contact surfaces between the relative motion and the friction force. Contact parameters as friction coefficient and contact stiffness are required to characterize the dynamics of the shrouded blade systems. A test rig for contact parameters measurement of flat-on-flat contact surfaces has been developed. One of the specimens is attached to the rig frame, basically an inertial mass and four springs, excited by an electromagnetic shaker. The second specimen is allowed to approach the first specimen and to rotate in such a way the geometric contact between the two surfaces occurs on three points. In this way a real “flat-to-flat” contact has been obtained. The tangential contact force and the relative displacements between specimens are measured and the friction coefficient and contact stiffness are determined.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2499007
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