Yanwen Li,Kaiqiang Wang,Hanwen Yang,Yilin Sun,Hanli Zhang,Ke Xiao,Zhenkun Li,Decai Li,Jinjin Li
Micro-vibrations adversely affect critical equipment, devices, and systems, resulting in economic losses and safety risks. Hence, the imperative tasks of monitoring and mitigating micro-vibrations present formidable challenges in the field of vibration control. This study introduces a solid-liquid triboelectric nanogenerator (TENG) based self-sensing vibration suppression device (S-L SVD) designed with a vertically structured configuration. This device not only possesses the capability to detect but also effectively reduce vibrations. The S-L SVD consists of an upper self-sensing unit utilizing liquid-silica synergy and a lower damping unit employing magnetic fluid (MF)-permanent magnet synergy. The S-L SVD exhibits a remarkable vibration monitoring sensitivity of 1.9 V/mm, enabling the detection of micro-vibrations with amplitudes as small as 0.368 mm. The self-sensing unit effectively functions as a miniature liquid tuned damper, substantially enhancing the device's damping capability, resulting in a noteworthy 19.6% damping efficiency improvement. Leveraging solid-liquid TENG, the S-L SVD seamlessly integrates vibration monitoring and suppression, showcasing exceptional durability. This innovation not only provides valuable insights into vibration monitoring but also introduces novel approaches for improving damping performance. Furthermore, the device is well-suited for applications in energy-scarce and challenging maintenance environments.
Electrorheological elastomers (EREs) with tunable stiffness and damping properties have emerged as advanced smart soft materials. In this study, we propose a novel hybrid EREs, which incorporates TiO2 anchored on hollow carbon spheres (TiO2/HCs), aimed at enhancing tunable stiffness and exceptional durability. The precursor of the EREs exhibits a reduction in zero-field viscosity attributed to the inclusion of nano-TiO2, which presents considerable advantages in the manufacturing process of EREs. Furthermore, a comprehensive analysis reveals that the prepared EREs possess favorable electro-viscoelastic properties and remarkable energy dissipation capabilities. Experimental results from quasi-static compression experiments and stress relaxation tests indicate that the isotropic EREs exhibits a significant electro-induced modulus increase from 1.26 MPa to 1.51 MPa. We have designed an effective micro-vibration suppression prototype by integrating the TiO2/HCs ERE with theoretical analysis. This prototype demonstrates a substantial reduction in transmission amplitudes across a frequency range of 20 Hz to 54 Hz, achieving a maximum micro-vibration isolation efficiency of 37.2%.
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