Gear mechanics metamaterial with elastic parameters continuously adjustable in large range

Abstract

The invention discloses a gear mechanics metamaterial with elastic parameters continuously adjustable in a large range. The gear mechanics metamaterial comprises a gear array, a frame and a connecting shaft. The gear array is formed by periodically extending mechanical metamaterial cells along an x direction and a y direction; each cell is formed by arranging a plurality of gears, and the adjacent gears are meshed with each other; the gear comprises a center hole and two centrosymmetric special-shaped holes, and the thickness of a cantilever between the special-shaped holes and the outer wall of the gear is evenly increased or decreased. The connecting shafts are arranged in center holes of the gears, and the gear array is connected with the frame through the connecting shafts. The equivalent Young modulus, shear modulus, damping, anisotropy and other elastic parameters of the mechanical metamaterial provided by the invention are closely related to the thicknesses of the cantilevers at the meshing points, and all gears in the metamaterial can be rotated by rotating any gear in the metamaterial, so that the thicknesses of the cantilevers at the meshing points are changed; and smooth and continuous regulation and control on the elastic parameters of the mechanical metamaterial are realized.

Description

technical field [0001] The invention relates to the field of mechanics and mechanical engineering, in particular to a gear mechanical metamaterial with adjustable elastic parameters in a large range. Background technique [0002] At present, the fourth industrial revolution has arrived, and the core of the fourth industrial revolution is intelligent structures and equipment, such as adaptive aircraft, adaptive control systems, intelligent connectors, intelligent vibration and noise control, etc. The intelligence of equipment requires intelligent adjustment of the units and materials of manufacturing equipment. Mechanical materials with adjustable elastic properties (including Young's modulus, shear modulus, and deformation mode) can provide basic support for the design and manufacture of smart devices. However, conventional piezoelectric materials and shape memory alloy materials are difficult to produce a large range of elastic tuning. There are many challenges in the des...

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Problems solved by technology

[0004] The present invention provides a gear mechanical metamaterial with continuously adjustable elastic parameters in a large range, which is used to overcome the shortcomings of the existing reconfigurable mechanical metamaterial design technology, such as narrow elastic parameter adjustment range, few stable states, and low control robustness.

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