Science and Education Publishing Biomedical Science and Engineering 2373-1265 3 2 2015 09 08 Preliminary Calculation of Bubble Dynamics in Cracking Sound Generation 30 34 EN Tetsuya Kanagawa Department of Engineering Mechanics and Energy, University of Tsukuba, Tsukuba, Japan Hisao Taira BSE2015321 10.12691/bse-3-2-1 2015 08 11 2015 08 28 2015 09 08 Bending a human joint generates a sound. This paper theoretically tackles the cracking sound generated by the manipulation of human joint such as finger. The Rayleigh-Plesset equation in the classical bubble dynamics is applied to determine the nonlinear oscillations of bubble that generates sound. Comparing the numerical solutions of the Rayleigh-Plesset equation for two types of modeling, i.e., forced- and free-oscillator assumptions for inhomogeneous terms, gives clear difference.