Publication Date |
1985 |
Personal Author |
D'Souza, A. F.; Aronov, V.; Kalpakjian, S.; Shareef, I.; Dweib, A. H. |
Page Count |
50 |
Abstract |
The interactions among friction, wear, and system dynamics have been investigated for dry sliding contact between a steel pin and a cast iron disk. The system was equipped with force and displacement transducers to measure the contact forces and the displacements in three directions. As the normal load increased, four different regimes were observed, the steady state friction regime, the nonlinear friction regime, transient friction regime, and the self-excited vibration regime. The last regime is characterized by periodic oscillations of the slider and high wear rate. The experimental setup was modified for further detailed study of this regime. The recorded wave forms showed that the oscillations consist of a fundamental harmonic with a frequency close to the system natural frequency in torsion and its second harmonic. A mathematical model was developed for the system including the coupling between the different degrees of freedom and a nonlinear contact stiffness, and the model was analyzed using triple input describing functions to include the constant, fundamental, and second harmonics. The model showed the existence of limit cycling at a frequency close to the torsional frequency of the system with amplitudes close to those observed experimentally. The results of this study enhance our understanding of friction induced vibrations and interactions which give rise to instability. (ERA citation 10:018844) |
Keywords |
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Source Agency |
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NTIS Subject Category |
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Corporate Authors |
Illinois Inst. of Tech., Chicago.; Department of Energy, Washington, DC. |
Document Type |
Technical Report |
NTIS Issue Number |
198513 |
Contract Number |
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