According to the principle of a piezoelectric scanner, a three degree-of-freedom (D.O.F) micromanipulator driven by piezoelectric tubes was developed to realize the integration of mechanism and actuator.Through the st...According to the principle of a piezoelectric scanner, a three degree-of-freedom (D.O.F) micromanipulator driven by piezoelectric tubes was developed to realize the integration of mechanism and actuator.Through the static analysis of the deflection of piezoelectric tube into four quadrants, a formula has been establish for the relationship between micro-displacement and driving voltage and accordingly, the angular error is analyzed. Experiments show that the micro-displacement calculated using the formula is in good agreement with the measurements. The relative error is less than 5%. Some performances of the micromanipulator show that it can be applied to some micromanipulations.展开更多
A recently emerging family of smart materials,photostrictive materials,exhibit large photostriction under uniform illumination of high-energy light.This photostriction mechanism arises from a superposition phenomenon ...A recently emerging family of smart materials,photostrictive materials,exhibit large photostriction under uniform illumination of high-energy light.This photostriction mechanism arises from a superposition phenomenon of photovoltaic and converse piezoelectric effects.A photostrictive type of opto-electromechanical actuator activated by high-energy lights can introduce actuation and control effects without hard-wired connections.The control light intensity applied to the actuator is proportional to the transverse velocity at a positioned point,which is measured by a laser vibrometer.In this paper,photostrictive films are numerically analyzed to evaluate their use as wireless actuators for future remote vibration control of flexible structures.A novel opto-electromechanical solid shell finite element formulation is developed for accurate analysis of the multiple physics effects of photovoltaic,pyroelectric and thermal expansion of photostrictive materials.Available experimental data and analytical solutions have been used to verify the present finite element results.The simulation in this study demonstrates that the present formulation is very reliable,accurate and also computationally efficient and that the use of photostrictive actuators can provide good controllability of structural vibration.展开更多
文摘According to the principle of a piezoelectric scanner, a three degree-of-freedom (D.O.F) micromanipulator driven by piezoelectric tubes was developed to realize the integration of mechanism and actuator.Through the static analysis of the deflection of piezoelectric tube into four quadrants, a formula has been establish for the relationship between micro-displacement and driving voltage and accordingly, the angular error is analyzed. Experiments show that the micro-displacement calculated using the formula is in good agreement with the measurements. The relative error is less than 5%. Some performances of the micromanipulator show that it can be applied to some micromanipulations.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10872090, 50830201)NUAA Research Funding (Grant No. NJ2010011)
文摘A recently emerging family of smart materials,photostrictive materials,exhibit large photostriction under uniform illumination of high-energy light.This photostriction mechanism arises from a superposition phenomenon of photovoltaic and converse piezoelectric effects.A photostrictive type of opto-electromechanical actuator activated by high-energy lights can introduce actuation and control effects without hard-wired connections.The control light intensity applied to the actuator is proportional to the transverse velocity at a positioned point,which is measured by a laser vibrometer.In this paper,photostrictive films are numerically analyzed to evaluate their use as wireless actuators for future remote vibration control of flexible structures.A novel opto-electromechanical solid shell finite element formulation is developed for accurate analysis of the multiple physics effects of photovoltaic,pyroelectric and thermal expansion of photostrictive materials.Available experimental data and analytical solutions have been used to verify the present finite element results.The simulation in this study demonstrates that the present formulation is very reliable,accurate and also computationally efficient and that the use of photostrictive actuators can provide good controllability of structural vibration.
