### FRICTION AND CONTACT DAMPING

#### Tamamlanmış Proje

### PEOPLE

### SUMMERY

Friction that develops in most mechanical systems such gas turbines and large space structures exhibits influence of both the surface properties and system dynamics. As a result, both the modeling and measurement of friction become difficult. In an otherwise stable dynamic system, friction plays a significant role in the resulting vibration response. Thus, better modeling of vibration response of systems, or their control, requires accurate and reliable expressions that describe friction. This research program concerns the development of an experimental method to accurately infer friction force in a dynamic system and identify its damping and tangential stiffness components.

Because friction force is not directly measured but inferred from response of the system to effects of friction, discerning the direct cause-and-effect between friction and its influence becomes a challenge. The method developed in our laboratory uses an experimental configuration that minimizes the influence of forces other than friction. Another challenge arises from continual change of interface where friction develops. These changes, largely classified as environmental and material changes, are usually difficult to control and require simultaneous monitoring to correlate with the measurements. The technique developed here uses methods to estimate such contributions.

### RELATED PUBLICATIONS

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*Physical Review E*, v.93 p.032142 - Roveri, N., Carcaterra, A., Akay, A. (2014). "Frequency intermittency and energy pumping by linear attachments",
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*Tribology International*, v.44 p.1100 - Pierce, A., Akay, A. (2009). "Intrinsic damping models and their role in predicting structural response",
*Journal of the Acoustical Society of America*, v.125 p.2602 - Carcaterra, A., Akay, A. (2009). "Vibration absorption based on cluster of beams",
*J. Sound and Vibration* - Akay, A., Giannini, O., Massi, F., Sestieri, A. (2009). "Disc brake squeal characterization through simplified test rigs",
*Mechanical Systems and Signal Processing*, v.23 p.2590-2607 - N. Roveri,, A. Carcaterra,, Akay, A. (2009). "Vibration absorption using non-dissipative complex attachments with impacts and parametric stiffness",
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*Journal of the Acoustical Society of America*, v.126 p.122-128 - Tangpong, X., Wickert, J., Akay, A. (2008). "Finite Element Model for Hysteretic Friction Damping of Traveling Wave Vibration in Axisymmetric Structures",
*ASME Journal of Vibration and Acoustics*, v.130 - Tangpong, X., Wickert, J., Akay, A. (2008). "Distributed friction damping of traveling wave vibration in rods",
*Philosophical Transactions of the Royal Society: Part A*, v.366 p.811-827 - Akay, A. (2008). "A Renaissance in Engineering PhD Education",
*European Journal of Engineering Education*, v.33 p.403-413 - Akay, A., Carcaterra, A., Lenti, F. (2007). "Pseudo-Damping in Undamped Plates and Shells",
*J. Acoust. Soc. Amer*, v.122 p.804-813 - Carcaterra, A., Akay, A. (2007). "Theoretical Foundations of Apparent-Damping Phenomena and Nearly Irreversible Energy Exchange in Linear Conservative Systems",
*Journal of the Acoustical Society of America*, v.121 p.1971-1982 - Ding, J., Tsaur, F., Lips, A., Akay, A. (2007). "Acoustical observation of bubble oscillations induced by bubble popping",
*Physical Review E*, v.75 - Carcaterra, A., Akay, A., Koc, I.M. (2006). "Near-irreversibility in a conservative linear structure with singularity points in its modal density",
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*J. Sound Vibration*, v.292 p.1-20 - Koh, K., Griffin, J.H., Filippi, S., Akay, A. (2005). "Characterization of turbine blade friction dampers",
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*Journal of the Acoustical Society of America*, v.118 p.3043-3049 - Koc, I., Carcaterra, A., Xu, Z., Akay, A. (2005). "Energy Sinks for Vibration Reduction: Optimum Frequency Distribution",
*Journal of the Acoustical Society of America*, v.118 p.3031-3042 - Carcaterra, A., Akay, A. (2004). "Transient Energy Exchange Between a Primary Structure and a Set of Oscillators: Return Time and Apparent Damping",
*Journal of the Acoustical Society of America*, v.115 p.683-696 - Filippi, S., Akay, A., Gola, M. (2004). "Measurement of Tangential Contact Hysteresis During Microslip",
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*J. Acoust. Soc. Amer.*, v.87 p.1449-1454 - Ingrad, K.U., Akay, A. (1987). "Acoustic radiation from bending waves of a plate",
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*J. Vibration, Acoustics, Stress and Reliability in Design*, v.109 p.178-184 - Bengisu, M.T., Hidayetoglu, T., Akay, A. (1986). "A theoretical and experimental investigation of contact loss in the clearances of a four-bar mechanism",
*J. Mechanism, Transmission, and Automation in Design*, v.108 p.237-244 - Latcha, M., Akay, A. (1986). "Application of the Helmholtz integral in acoustics",
*J. Vibration, Acoustics, Stress and Reliability in Design*, v.108 p.447-453 - Akay, A., Tokunage, M., Latcha, M. (1984). "A theoretical analysis of transient sound radiation from a clamped circular plate",
*J. Applied Mechanics*, v.51 p.41-47 - Akay, A., Bengisu, M.T., Latcha, M. (1983). "Transient acoustic radiation from impacted beam-like structures",
*J. Sound and Vibration*, v.91 p.135-145 - Akay, A., Latcha, M. (1983). "Sound radiation from an impact-excited clamped circular plate in an infinite baffle",
*J. Acoust. Soc. Amer*, v.74 p.640-648 - Akay, A. (1982). "Mathematical modeling of transient vibration and acoustic radiation from impacted systems",
*J. Mathematical Modeling*, v.3 p.535-541 - Cook, R., Hamm, C.W., Akay, A. (1981). "Shock measurement with noncontacting fiber optic levers",
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*J. Acoust. Soc. Amer.*, v.69 p.1746-1752 - Akay, A., T. H. Hodgson (1978). "Sound radiation from a accelerated or decelerated sphere",
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*Applied Acoustics*, v.11 p.285-304 - Akay, A., E. Saibel (1978). "Fracture time of composites under tensile loading",
*J. Composite Materials*, v.12 p.262-274 - Akay, A. (1978). "A review of impact noise",
*J. Acoust. Soc. Amer*, v.64 p.977-987 - Akay, A., E. Saibel (1976). "Fracture of polymeric materials under tensile loads",
*Wear*, v.37 p.377-381 - A. Akay and A. Carcaterra ''Damping Mechanisms'' (2014). "Active and Passive Vibration Control of Structures, (P. Hagedorn and G. Spelsberg-Korspeter, Eds., CISM International Centre for Mechanical Sciences)",
*Springer*p.259-299