38 results about "Mechanical metamaterial" patented technology

The present invention provides meta-materials with an actively controllable mechanical property. The meta-material includes a deformable structure and a set of activation elements. The activation elements are controllable between multiple states. The meta-material includes a first value for a mechanical property when one or more of the activation elements is in the first activation state and includes a second value for the mechanical property when the activation elements have been activated to the second activation state. In one aspect, the meta-material resembles a composite material where the connectivity between the component materials or shape and arrangement of the component materials is dynamically controllable so as to affect a mechanical property of the meta-material.

The invention relates to a mechanical energy absorption metamaterial based on a buckle structure and a production method of the mechanical energy absorption metamaterial, wherein the metamaterial comprises a plurality of single-layer mechanical metamaterials which are arranged in an array; every two adjacent single-layer mechanical metamaterials are arranged in a mirror image way and are fixedly connected by a hard partition plate, wherein each of the single-layer mechanical metamaterial comprises a matrix provided with a plurality of independent buckle grooves side by side along a length direction, and a flexible connecting beam is formed in a position, between every two adjacent buckle grooves, on the matrix; each of the buckle grooves comprises a buckle and a clamping groove which are matched with each other and are spaced for a fixed distance; each of the single-layer mechanical metamaterials is made of a flexible elastomer; each of the single-layer mechanical metamaterials comprises a first stable state that the buckle is separated from the clamping groove and a second stable state that the buckle is combined with the clamping groove; when a load applied by the outside reaches the maximum value of mechanical energy absorption, each of the single-layer mechanical metamaterials can be switched from the first stable state to the second stable state; and when a load with an opposite direction is applied, each of the single-layer mechanical metamaterials can be restored to the first stable state.

The invention discloses a passive wireless machine grabbing hand based on a mechanical metamaterial structure, which includes a graphene oxide layer of a mechanical metamaterial structure, a graphene layer of a mechanical metamaterial structure, an upper plate of a capacitor, a dielectric layer, and a lower capacitor. Plates, planar inductors, vias, substrates, anchor regions, the graphene layer of the mechanical metamaterial structure is located below the graphene oxide layer of the mechanical metamaterial structure, the double-layer mechanical metamaterial structure is located on the front of the substrate, and the center of the mechanical metamaterial structure The place is a pressure-sensitive capacitor composed of the upper plate of the capacitor, the dielectric layer and the lower plate of the capacitor. The lower plate of the capacitor is connected to the anchor area, and the anchor area is connected to the planar inductance on the back of the substrate through the through hole. The present invention is based on the LC resonant circuit The change of resonant frequency can realize the detection of the object on the grasping hand, and apply infrared light excitation to the grasping hand to realize the purpose of grasping the object. It has the advantages of high sensitivity, small measurement error, small size, low power consumption, and novel structure. .

The invention discloses an acceleration sensitive mechanism based on mechanical metamaterial and a composite sensitivity micromechanical accelerometer. The accelerometer comprises an acceleration sensitive mechanism, a displacement sensing mechanism, and a sensitivity switching actuator; the acceleration sensitive mechanism comprises a mass, a folded beam and a mechanical metamaterial periodic structure; one end of the folded beam and one end of the mechanical metamaterial periodic structure are respectively connected to the two ends of the mass; the folded beam is used to provide the positivestiffness to the acceleration sensitive mechanism; the mechanical metamaterial periodic structure is used to provide positive and negative stiffness which are changed with the displacement; the sensitivity switching actuator is used to control the mass to move to different stiffness regions. The acceleration sensitive mechanism based on mechanical metamaterial and the composite sensitivity micromechanical accelerometer adopts a serial connection manner of the mechanical metamaterial periodic structure and the folded beam to form a flexible structure having a plurality of stress-strain linearregions with different slopes; the flexible structure of the acceleration sensitive mechanism can have different stiffness at different positions, thus has multiple sensitivities.

The invention discloses a temperature sensor, which comprises a substrate, two heat-driven V-shaped beam structures, a frame-shaped mechanical metamaterial structure, and a strain-sensitive thin film. Two thermally actuated V-shaped beam structures are located on either side of the frame-shaped mechanical metamaterial structure. A strain-sensitive membrane sits at the center of the frame-shaped mechanical metamaterial structure. When the ambient temperature changes, the suspended heat drives the V-shaped beam to expand or contract under the influence of temperature, drives the rigid insulated connecting wire to drive the frame-shaped mechanical metamaterial structure to expand or contract in multiple directions, and the expansion or contraction of the mechanical metamaterial structure The shrinkage is transmitted to the strain-sensitive film through the rigid insulated connection wire, and the strain-sensitive film converts multi-directional strain into a change in resistance value, and the ambient temperature is measured by detecting the change in resistance, so the detection sensitivity of the device is greatly improved.

The invention belongs to the technical field of mechanical metamaterials, in particular to a high-strength chiral compression-torsion superstructure material. The chiral compression-twist superstructure material of the present invention is formed by repeatedly stacking several cells; each cell is a cube surrounded by six in-plane chiral structures with the same structure; the in-plane chiral structure consists of 8 beams and A ring is composed of coplanar; among the 8 beams, 4 long beams and 4 short beams are alternated, one end is tangent to the ring respectively, and is combined into a whole, and the other end is located at the four vertices of a square and the square of the square. At the midpoint of the four sides; in the cell, there are six in-plane chiral structures with the same structure, and the outer endpoints of the three adjacent beams of the two in-plane chiral structures are connected correspondingly to form a space cube. The superstructural material exhibits stable and significant torsional behavior under compression, and the maximum compression-torsional angle can be adjusted by the thickness of the beam, the number of cells and the number of layers.

The present invention provides a pressure sensor based on a mechanical metamaterial structure, comprising: a substrate, a pressure sensing unit, at least one thermal driving unit, a strain sensing unit, an anchor point group and a lead group arranged on the substrate, wherein the strain sensing unit includes a mechanical A metamaterial structure and a strain sensitive film, wherein the pressure sensing unit is electrically connected with at least one thermal driving unit through a lead group and an anchor point group to form a current path, and when the current in the current path changes, the thermal driving unit can generate a single directional strain, the mechanical metamaterial structure is connected with each thermally driven unit to convert single-directional strain into multi-directional strain, and the strain-sensitive film is electrically connected with the mechanical metamaterial structure to output resistance values ​​according to the multi-directional strain, through The resistance value is detected to realize the measurement of the pressure, thereby improving the sensitivity of the pressure sensor to the pressure.

The present application discloses a non-reciprocal bending mechanical metamaterial and a design method thereof. The non-reciprocal bending mechanical metamaterial comprises a plurality of unit cell structures periodically arranged and interconnected in a three-dimensional space; , the unit cell structure includes the first division, the second division and the third division, along the second direction, the unit cell structure also includes the fourth division and the fifth division arranged oppositely; along the third direction, the unit cell structure The cellular structure also includes the sixth division and the seventh division which are arranged oppositely; a kind of non-reciprocal bending mechanical metamaterial provided by the present invention realizes the natural material by breaking the space inversion symmetry of the three-dimensional structure and introducing nonlinearity The asymmetric positive and negative bending stiffness properties that do not have provide a new paradigm for mechanical functional metamaterials.

The present invention provides a passive wireless temperature sensor based on a mechanical metamaterial structure. The temperature sensor includes: a substrate, and at least one temperature sensing unit and a strain sensing unit arranged on the substrate. The strain sensing unit includes a mechanical metamaterial structure, an LC A resonant circuit and a plurality of insulating supports; wherein the mechanical metamaterial structure is connected to at least one temperature sensing unit to receive a single-directional strain generated by the temperature sensing unit due to temperature changes, and convert the single-directional strain into multi-directional Strain, the LC resonant circuit is connected to the mechanical metamaterial structure through multiple insulating supports to produce a change in the resonant frequency under multi-directional strain, and to measure the resonant frequency non-contact through mutual inductance coupling to achieve temperature measurement. The invention adopts a passive wireless measurement method, so that the temperature sensor has low power consumption and is easy to measure, and also has the advantages of simple structure, small measurement error, and process compatibility.

Disclosed is a method of manufacturing a stretchable substrate according to various embodiments of the present disclosure for realizing the above-described objectives. The method may include generating an auxetic including a plurality of unit structures and adhering one or more elastic sheets to one surface of the auxetic.