Randomized resonance metamaterial structure solves the technical problem of single sensor vibration traceability.
The research team of He Qingbo, a professor at the School of Mechanical and Power Engineering, Shanghai Jiaotong University, proposed a randomized resonance metamaterial structure, which broke through the technical difficulty of single sensor vibration traceability. The result paper was recently published in "Nature-Communication".
In nature, spiders can sensitively know and locate the vibration of insects that land on the web. Using a sensor like a spider to perceive and locate remote vibration excitation is the source of vibration trace, and it has important application value in the fields of medical health monitoring, machine fault diagnosis, smart devices and the Internet of Things. The traditional vibration source identification technology usually relies on multiple distributed sensors or sensor networks, and the test system is complicated and the power consumption is high.
In order to break through the bottleneck of the traditional vibration source identification technology limited by the number of sensors, He Qingbo et al. Proposed the design and regulation of vibration transmission characteristics using the principle of metamaterial structure. Metamaterial is an artificial composite material that does not exist in nature, and has extraordinary dynamic characteristics. The researchers proposed the dynamic theory of stochastic coupled oscillators, established a dynamic analysis method incorporating the equivalent negative mass characteristics, and used this to guide the design of a stochastic coupled local resonance metamaterial structure model, which contains multiple random Resonant frequency and disorderly coupled local oscillator.
The researchers found that the random distribution and coupling of the local mass equivalent mass of the metamaterial structure model produced highly uncorrelated spatial vibration transmission characteristics, which formed the physical mechanism of the vibration transmission characteristic coding design. The researchers further constructed the observation matrix of the compressed sensing algorithm by using the characteristics of vibration transfer coding. Using only one vibration sensor measurement signal, the high-precision identification of multi-source broadband vibration excitation was realized, and the method was proved to be robust to noise.
The metamaterial structure has flexible unit reconfigurability and can meet the needs of different applications. The researchers also created a new type of human-computer interaction based on single-sensor vibration tracing that can be used for command, communication, encryption, and touch sensing. (Reporter Huang Xin)
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