The ability to predict behavior of some type of wood as part of a musical instrument is of a great importance. One of the important characteristics of a material, from the standpoint of musical acoustics, is Young's modulus of elasticity, which can be determined by observing the wooden beam test sample response to an excitation. In this process visualization of modes helps pairing frequencies from response spectra with vibration modes of sample, which allows us to numerically calculate Young’s modulus for different frequencies. In this paper, visualization of vibration modes are achieved using the microphone Very Near Field scanning of excited samples.
This paper presents the method for prediction of some basic mechanical parameters of a wood specimen by using simple instrumentation. The standard acoustic method for assessment of modulus of elasticity using the impulse excitation is extended by using a recording in the very near field. In this way, visualization of vibration patterns of the analyzed sample was accomplished for all modes below 5 kHz. This enables detection of signals with a good signal-to-noise ratio over a wide frequency range which is then used for loss factor assessment.
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