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Hysteresis and the nonlinear equivalent piezoelectric coefficient of MFCs for actuation

Chinese Journal of Aeronautics 2017年第1期30卷 88-98页

作者： Xue Zheng Li Lin M.N.Ichchou Li Chao School of Energy and Power Engineering Beihang University Beijing China Collaborative Innovation Center for Advanced Aero-Engine Beijing China Laboratoire de Tribologie et Dynamique des Systemes (LTDS) UMR 5513 Ecole Centrale de Lyon Ecully France

The hysteretic behavior and nonlinearity of the equivalent material coefficient of macro fiber composites（MFC） under staircase input conditions are investigated using the Preisach *** on a database of first order reversal curves, formulas are derived to predict the hysteresis of strain output and nonlinearity of the equivalent piezoelectric coefficient of MFCs. Formulae are verified by comparing the predicted strains with the measured strains of three MFC specimens,which are driven by a random sequence of staircase voltage inputs. The coefficients obtained by the formulae and experimentation coincide. Further results indicate that the equivalent piezoelectric strain coefficient depends greatly on the value of drive voltage across the entire input range, and the coefficient is asymmetric across the negative and positive input ranges. Deflection testing of an MFC composite cantilever demonstrates the importance of taking the nonlinearity of the equivalent piezoelectric coefficient into consideration in the application of actuation.

关键词： Hysteresis macro fiber composite Nonlinear piezoelectric coef-ficients Piezoelectric materials Preisach model

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Dynamic responses of a piezoelectric cantilever plate under high-low excitations

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Acta Mechanica Sinica 2020年第1期36卷 234-244页

作者： Xiangying Guo Shuaibo Wang Lin Sun Dongxing Cao College of Mechanical Engineering Beijing University of TechnologyBeijing100124China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Beijing100124China School of Mechanical Engineering Liaoning Shihua UniversityFushun113001China

In this paper,the nonlinear dynamic responses of a piezoelectric cantilever plate near the first-order and second-order natural frequencies under the action of electromechanical coupling are studied by experiments and finite element(FE)*** influence of different excitation frequencies on the dynamical characteristics of piezoelectric cantilever plates is analyzed with the fixed excitation ***,an experimental setup is built,including a carbon fiber cantilever plate attached to a macro fiber composite(MFC)***,the electromechanical coupling excitations are subjected to the plate with different frequencies,which are chosen near the first and second-order natural frequencies of the *** piezoelectric cantilever plate has periodical motions under a lower frequency excitation,and the motions of the plate become more complex after another high frequency excitation added in the physical *** experimental results show that the motion of the piezoelectric cantilever plate changes from stable to unstable with high-low coupled resonant *** last,the FE study is carried out to compare and verify the experimental results and the effects of isotropic and orthotropic materials on the accuracy of natural frequencies results are also compared.

关键词： macro fiber composite Piezoelectric cantilever plate Dynamics Electromechanical coupling

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Principle and Experimental Verification of Flexible Caudal Fin Based on Active Torsion Propulsion Mode

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第5期33卷 595-601页

作者： Guan Yuanlin Li Huafeng Yang Xixin Di Sisi School of Mechanical Engineering Qingdao University of Technology Qingdao 266100 P.R. China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 P.R. China School of Data Science and Software Engineering Qingdao University Qingdao 266100 P.R. China

The active torsion propulsion mode of a caudal fin,composed of macro fiber composites(MFC)and carbon fiber orthotropic composite material is *** caudal fin is excited by the piezoelectric structure to vibrate *** work principle is firstly analyzed by finite element method(FEM)and *** the caudal fin is optimized to increase the torque and improve the streamline,and the added mass effect from the water is discussed in terms of the frequency of the *** torsion resonance frequency is around 103 Hz in the air and decreased by 75%to 25 Hz in the ***,the mean thrust is discussed and measured to be 11 mN at900V(Peak to peak)driving voltage.A flexible micro robot is developed and *** locomotion velocity and flow velocity is 320mm/s and 268mm/s,*** results of the simulation and experiments indicate that the locomotion of the biomimetic aquatic robot has fast movement characteristics.

关键词： macro fiber composite torsion vibration mode local travelling wave micro robot

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