Analysis Of Heat Effect Against Nonlinear Acoustics Wave Modulation Intensity- Experimental Approach

Rozimi, Harun (2011) Analysis Of Heat Effect Against Nonlinear Acoustics Wave Modulation Intensity- Experimental Approach. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this research is to define the relationship of heat dissipation with the intensity of nonlinear acoustic modulation. Therefore, nonlinear vibro-acoustic technique will be used to analyze this relationship. Nonlinear vibro-acoustic is a highly reliable and sensitive method that generally used to detect the defects on the structures. Many researchers have used this method to detect the various types of defects on various types of materials. This method is based on the propagation of high frequency acoustic wave in solid structure with low-frequency excitation. Interaction of the acoustic wave with material or geometry properties changes will cause wave distortion effects. From previous researches, it is accepted that nonlinear acoustic modulation is caused by the crack opening/closing actions. But, there might be other physical mechanisms that involved behind the modulation such as heat dissipation. So, an experiment setup will be designed in order to identify the relation of heat dissipation on solid structure with the intensity of nonlinear acoustic modulation. Finally, the contribution of the heat dissipation against the nonlinear acoustic effect for crack detection will become more explanable. The results from this experiment show that the heat dissapation does not affect the intensity of nonlinear acoustic modulation. It is because the is no distortion of wave when propagate through the heated plate such as generation of sidebands.

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