8 results about "Bistability" patented technology

The present disclosure relates to a mechanical metamaterial with a variable bistable state. The mechanical metamaterial comprises a plurality of metamaterial unit cells connected in sequence in a first direction. Each metamaterial unit cell comprises a connecting head, a variable part and a fixed part connected in sequence in the first direction. The variable part comprises a plurality of variable sheet groups, each variable sheet group comprising two variable sheets, each variable sheet having a top end connected to the connecting head and a bottom end connected to the fixed part, and the width of each variable sheet increasing from the top end to the bottom end. The two variable sheets of each variable sheet group are symmetric about the axis center of the connecting head. The fixed part has a cavity facing the connecting head, and when an axial load is applied to the top of the connecting head, the top end of the variable sheet is bent in the direction of the cavity under the action of the connecting head, and part of the variable sheet and part of the connecting head can be accommodated in the cavity at the top of the fixed part. The mechanical metamaterial of the present disclosure can maintain stable and large deformation and has good band gap regulation ability.

The invention discloses a motion adjustment method, device, system and equipment based on bistability, and the method comprises the steps: processing impact force acting on a collision part of a moving object through a plurality of bistable units, obtaining impact parameters, enabling the bistable units to be attached to the collision part, and enabling each bistable unit to comprise a disc-shaped wafer and a strain sensor; based on the impact parameter, determining a collision coping strategy for the collision part; and performing motion adjustment on the moving object based on the collision coping strategy so as to improve the motion scientificity of the collision part. The problem that a large amount of key motion information is easily missed in a traditional method, and consequently motion scientificity is poor is solved.

The application relates to a bistable SR system and a low signal-to-noise ratio multi-frequency sound signal detection device and method. By introducing an optical fiber device, the closed-loop regulation of the optical fiber grating is utilized to realize the random resonance phenomenon based on the bistability, and the low signal-to-noise ratio signal can be effectively extracted under the strong noise background. Secondly, by introducing a carrier signal, the difference frequency signal is obtained by mixing with the external signal, and the multi-frequency signal sensing is realized under the premise of fixing the detection range of the difference frequency signal. In addition, by introducing the array structure of the optical fiber hydrophone, the spatial gain is formed, and the high-sensitivity detection effect can be realized. Finally, the frequency distribution and the relative signal-to-noise ratio intensity size distribution of the obtained target sound signal can be used as the input of the neural network model, the intelligent identification of the low signal-to-noise ratio target sound target is realized, and the detection and early warning of the underwater target can be maximally realized.

The invention provides an optical frequency comb control method and system based on a step and bistable effect, and relates to the technical field of integrated photonics, and the method comprises the steps: generating a step and bistable region through adjusting the structure parameters and / or material types of a cavity optical mechanical-thermal system; laser detuning amount scanning is carried out in a stepped and bistable region, and the comb tooth state of the optical frequency comb is controlled by changing the scanning direction to adjust the laser detuning amount of the cavity resonant frequency in the cavity optical mechanical-thermal system. According to the invention, through cooperative work of steps and bistable states, two operations of rapid hopping and low power consumption locking can be completed in the same device, a complete control closed loop of rapid write-nonvolatile maintenance is formed, system delay and energy consumption are significantly reduced, and the control efficiency of the optical frequency comb is improved to a great extent.

The application provides a spirobifluorene derivative, a preparation method thereof and application thereof in an electrochromic device, and belongs to the technical field of organic polymer chemistry. The application successfully prepares electrochromic materials with different colors by exploring the difference between nitro and amino and combining fine regulation of the side chain electronic structure. The materials have the characteristics of high neutral state transmittance and bistability, and are expected to be applied in the fields of display, anti-counterfeiting and biological analysis. Specifically, the spirobifluorene derivative of the application not only endows the material with the electrochromic function, but also embeds the methoxy unit with high stability, so that the stability of the electrochromic small molecule device is significantly enhanced, and the material also has the characteristics of neutral state transparency and long-lasting bistability after coloring.

The invention discloses a wireless threshold temperature sensor of a paper folding structure. The temperature sensor comprises a substrate, a V-shaped beam, a paper folding structure, a movable metal tip structure and a fixed metal tip structure. The movable metal tip structure is grounded, and the fixed metal tip structure is connected with a high-voltage source. The paper folding structure is composed of two materials with different thermal expansion coefficients, the thermal expansion coefficient of the first paper folding unit material is smaller than that of the second paper folding unit material, and the first paper folding unit material has a bistable state. The wireless threshold temperature sensor has the advantages of simple structure, sensitive response, long transmission distance, ultra-low power consumption, reusability and the like.