Abstract
Analysis of the structural vibration, under the sound excitation is an important part of the quality assurance during the design process of devices. One of the most commonly used method is Laser Doppler Vibrometry (LDV). However, under the rapid fluctuations of temperature, structural resonances are shifted into the other frequencies. In such situation LDV method may be inconvenient, due to the scanning time. In this paper the authors proposed Chladni figures to modal analysis of the double-panel structure, excited by the loudspeaker enclosed inside the casing with a rigid frame. Double-panel structure has been proven to be particularly useful for noise and vibration reduction applications. Vision images, obtained during the experiments are converted to binary patterns, using GLCM matrix, and compared with simulations performed in ANSYS.
Highlights
Noise exposure is a common issue, which may significantly annoy or even result in irreversible hearing loss of workers and people using noisy appliances in their everyday life [1]
The results show that Chladni figures method can be useful tool in modal analysis of the horizontally arranged, double-panel structures
There was no mechanical coupling between the structure and the excitation source, as in the classical approach, and different boundary conditions were assumed
Summary
Noise exposure is a common issue, which may significantly annoy or even result in irreversible hearing loss of workers and people using noisy appliances in their everyday life [1]. Both noise and vibration have an impact on humans. In the traditional passive noise reduction techniques, absorptive materials or vibration absorbers may be used [4]. These techniques are ineffective at low frequencies [5], which is wider explained in [6,7]. In semi-active methods, specific materials or elements are used to modify on demand properties of the structure in such a way that vibration or noise propagation is reduced
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