文献类型：期刊文献

英文题名：The dissipative dynamic performances of dielectric elastomer actuator with viscoelastic effects

作者：Li, Jin[1];Zhang, Yao[1];Nguyen, TuanDung[1];Sun, Lijie[1];Tran, DanhQuang[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：9

期号：7

外文期刊名：MATERIALS RESEARCH EXPRESS

收录：;EI(收录号：20223012401003);WOS:【SCI-EXPANDED(收录号:WOS:000824312100001)】；

基金：This work was supported in part by the National Nature Science Foundation of China (Grant No. 52075172), and the Natural Science Foundation of Shanghai (19ZR1413300).

语种：英文

外文关键词：dielectric elastomer actuator; dissipative process; viscoelastic creep; viscoelastic hysteresis

摘要：With large deformability and high energy density, Dielectric elastomers (DEs) deserve interest in soft robotics. Many challenges remain in the real-world applications, for the dynamic performance of dielectric elastomer actuator and their energy efficiency are affected by the dissipation mechanisms in the actuators. Concerning the viscoelasticity of DEs, we present a modeling approach to describe the dissipation mechanism to predict how the dissipative process affects the dynamic behavior. The validity and generalization of the model have been extensively verified under various excitation voltages (different peak voltages, frequencies, pre-stretching, and signal waveforms). For harmonic voltages at different frequencies (0.05, 0.1, 0.2, 0.5, 1 Hz), the root mean square error is less than 5.99%. The phase difference was adopted to quantify the viscoelastic hysteresis dissipative behavior of DEs. The results show that the viscoelastic hysteresis is sensitive to frequency and waveform. In addition, we found that the viscoelastic hysteresis of the DEs under harmonic excitation can be improved by inserting a small amount of saw-tooth excitation loads. This finding is particularly useful for the actuation of soft actuators and soft robots, which use alternating loads as the dominant excitation signal. For future applications, this model presents a method to describe the dissipative behaviors in dynamic actuation quantitatively and paves the way to high-performance actuation control and manipulations for soft robots.