Vibrator unit and nonlinear acoustic metamaterial cellular structure based on vibrator unit
A nonlinear acoustic and metamaterial technology, applied in the field of vibration and noise control, mechanics, nonlinear acoustic metamaterial structure, mechanical engineering, to achieve the effect of breaking the limitation of low frequency broadband
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[0097] In the vibrator unit of Embodiment 1, the cladding layer 30 is clad on the outer surface of the spherical body 21 . The surface of the sphere 21 facing the base 40 is not provided with the cladding layer 30 . There is a small gap δ between the sphere 21 wrapped by the coating layer 30 and the inner wall of the cavity. 0 Satisfy δ 0 = r B -r Ac , where r B is the inner diameter of the cavity, r Ac is the radius of the sphere 21 after the cladding layer 30 is set.
[0098] see Figure 4 , the two oscillators are in the small gap δ 0 The contact collision generated during internal motion forms a strong nonlinear coupling, and the equivalent nonlinear stiffness coefficient k c for Among them, the positive odd integer n is the selected equivalent order, c F is the constant coefficient needed to approximate the function, δ 0 reduce k by an order of magnitude c Just increase by n orders of magnitude. During use, those skilled in the art can adjust the gap value b...
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