2pSA4. Spectrum analysis structure of echosignals from composite pipe lines in aircraft technique.

Session: Tuesday Afternoon, June 17

Author: V. Genis
Location: Biomed. Eng. and Sci. Inst., Drexel Univ., Philadelphia, PA 19104
Author: I. L. Oboznenko
Location: Kiev Polytech. Inst., Kiev, 252056, Ukraine
Author: T. Yu. Shkvarnitskaya
Location: Kiev Avia Inst., Kiev, 252057, Ukraine


An acoustical diagnostics model of composite shells for aircraft systems is proposed. The peculiarity of this model emerges from taking into account shell anisotropical properties. On this basis, the decision to use a method of structure breach in the pipe line is proposed. Peculiarities that are bound up with pipe-line constructions and determine natural resonances and antiresonances are noted. By excitation of surface waves it becomes possible to identify the presence of shell norms and destruction. Qualitative corroboration of sound-speed change effect in the composite shell is obtained. It allows one to prognosticate the state of pipe-line aircraft systems.

ASA 133rd meeting - Penn State, June 1997