Abstract
Recently, an effective approach (namely, an ultrasonic full-waveform analysis method) has been proposed for the ultrasonic measurement of solid-propellant burning rate as a function of pressure in a single test. In this study, highfrequency ultrasonic transducers are adopted for the acquisition of ultrasonic full waveforms in order to increase the spatial resolution of the measurement. Unfortunately, however, these transducers are susceptible to random noise. This paper addresses an effective approach for reducing high-frequency random noise to the ultrasonic full waveforms using the wavelet-shrinkage method. Furthermore, this paper presents the results of the noise reduction at ultrasonic full waveforms captured from solid-propellant samples together with the improvement in the measurement accuracy of solid-propellant burning rates obtained by adopting the proposed approach.
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