Flexible hinges are widely used in micro motion robotics. Its rigidity directly influences an organization＇s terminal localization. Its actual structure geometry size cannot satisfy the theoretical analysis completel...Flexible hinges are widely used in micro motion robotics. Its rigidity directly influences an organization＇s terminal localization. Its actual structure geometry size cannot satisfy the theoretical analysis completely in a theoretical supposition condition. In this paper, we analyzed the rotation rigidity of a corner-filleted straight beam flexible hinge in different parameters using finite element software ANSYS. The errors are discovered and compared with theoretical results. Through the graph of the flexible hinge parameters and its performance, an analysis of changes of parameters on the performance of a corner-filleted flexible hinge was carried out. The key manufacture parameters that affect the performance of a corner-filleted flexure hinge the most and rules of design are given, which can provide directions of design precision for the flexure hinge.展开更多
A new precision piezoelectric actuator is proposed to improve its drive capabilities. The actuator is based on the piezoelectric technology. It adopts the principle of bionics and works with a new method of stator ini...A new precision piezoelectric actuator is proposed to improve its drive capabilities. The actuator is based on the piezoelectric technology. It adopts the principle of bionics and works with a new method of stator initiative anchoring/loosen and a distortion structure of double-side thin flexible hinge. It solves the problem of anchoring/loosen, frequency, journey, resolution and velocity. The experiment shows that the new linear piezoelectric actuator works with high frequency （100 Hz）, high speed （502 μm/s）, large travel （〉10 mm）, high resolution （0.05 μm） and high load （100 N）. This kind of new piezoelectric actuator will be applied for large travel and high resolution driving device, optics engineering precision positioning and some micromanipulation field.展开更多
By the mathematic models of flexible hinge,the accurate relationship between the phase-shifting and pressure acting on the hinge is deduced and verified by experimental results.Through the optimization of the geometri...By the mathematic models of flexible hinge,the accurate relationship between the phase-shifting and pressure acting on the hinge is deduced and verified by experimental results.Through the optimization of the geometric parameter of flexible hinge,a phase-shifting generator is developed to determine the length of an object precisely by interferometry.The experiments show that the triple phase-shifting produced using this generator is up to 1 m.With this generator,an example for the application in length measurement is introduced.The result shows the length uncertainty is 0.5 nm when the temperature uncertainty is limited in 2 mK.This paper provides a novel technique to measure the dimension of an object,especially to the diameter of a silicon sphere for Avogadro constant project.展开更多
Recently Hari Shroff and his collaborators[Nano Letters 5(2005)]developed a nanoscopic force sensor,but the force which they measured in their single molecular experiment was much lower than the theoretical critical v...Recently Hari Shroff and his collaborators[Nano Letters 5(2005)]developed a nanoscopic force sensor,but the force which they measured in their single molecular experiment was much lower than the theoretical critical value.In order to fix this problem,we investigate the micromechanics of dsDNA based on the worm-like chain model and flexible hinge model by using Monte Carlo algorithm.The simulation results not only address Hari Shroff’s experiment difficulty reasonably,but also provide strong support for flexible hinge mechanism put forward recently by Yan and Marko[Phys.Rev.Lett.93(2004)].展开更多
A new precision rotary piezoelectric(PZT)actuator is proposed to improve its drive performance.Based on piezoelectric technology,the actuator adopts the principle of bionics,with a new method of stator inner anchor/lo...A new precision rotary piezoelectric(PZT)actuator is proposed to improve its drive performance.Based on piezoelectric technology,the actuator adopts the principle of bionics,with a new method of stator inner anchor/loosen/rotor outer drive and a distortion structure of a thin shelf flexible hinge.This structure improves the stability of the anchor/loosen and step rotary.Its characteristics are evaluated by finite element analysis.The experiment shows that the new rotary PZT actuator works with higher frequency(40 Hz),higher speed(325 mrad/s),wider movement(360u),high resolution(1 mrad/step)and high torque(30 N?cm).The novel actuator can be applied in wide movement and high resolution driving devices such as those for optics engineering,precision positioning and some other micro-manipulation fields.展开更多
文摘Flexible hinges are widely used in micro motion robotics. Its rigidity directly influences an organization＇s terminal localization. Its actual structure geometry size cannot satisfy the theoretical analysis completely in a theoretical supposition condition. In this paper, we analyzed the rotation rigidity of a corner-filleted straight beam flexible hinge in different parameters using finite element software ANSYS. The errors are discovered and compared with theoretical results. Through the graph of the flexible hinge parameters and its performance, an analysis of changes of parameters on the performance of a corner-filleted flexible hinge was carried out. The key manufacture parameters that affect the performance of a corner-filleted flexure hinge the most and rules of design are given, which can provide directions of design precision for the flexure hinge.
基金This project is supported by National Hi-tech Research and Development Program of China(863 Program, No.2002AA423150)
文摘A new precision piezoelectric actuator is proposed to improve its drive capabilities. The actuator is based on the piezoelectric technology. It adopts the principle of bionics and works with a new method of stator initiative anchoring/loosen and a distortion structure of double-side thin flexible hinge. It solves the problem of anchoring/loosen, frequency, journey, resolution and velocity. The experiment shows that the new linear piezoelectric actuator works with high frequency （100 Hz）, high speed （502 μm/s）, large travel （〉10 mm）, high resolution （0.05 μm） and high load （100 N）. This kind of new piezoelectric actuator will be applied for large travel and high resolution driving device, optics engineering precision positioning and some micromanipulation field.
基金supported by the National Key Technology R&D Program of China (Grant No. 2006BAF06B06)
文摘By the mathematic models of flexible hinge,the accurate relationship between the phase-shifting and pressure acting on the hinge is deduced and verified by experimental results.Through the optimization of the geometric parameter of flexible hinge,a phase-shifting generator is developed to determine the length of an object precisely by interferometry.The experiments show that the triple phase-shifting produced using this generator is up to 1 m.With this generator,an example for the application in length measurement is introduced.The result shows the length uncertainty is 0.5 nm when the temperature uncertainty is limited in 2 mK.This paper provides a novel technique to measure the dimension of an object,especially to the diameter of a silicon sphere for Avogadro constant project.
基金This research was supported by the Young Investigator Award received by Yan in 2006 and the Foundation for the Visiting PhD Candidate of the Chinese Academy of Science received by Liu in 2006Liu is also supported by the Innovation Foundation for Graduate Students of Guizhou University(2007022).
文摘Recently Hari Shroff and his collaborators[Nano Letters 5(2005)]developed a nanoscopic force sensor,but the force which they measured in their single molecular experiment was much lower than the theoretical critical value.In order to fix this problem,we investigate the micromechanics of dsDNA based on the worm-like chain model and flexible hinge model by using Monte Carlo algorithm.The simulation results not only address Hari Shroff’s experiment difficulty reasonably,but also provide strong support for flexible hinge mechanism put forward recently by Yan and Marko[Phys.Rev.Lett.93(2004)].
基金supported by the Hi-Tech Research and Development Program of China (No.2002AA423150)the National Natural Science Foundation of China (Grant No.50475010).
文摘A new precision rotary piezoelectric(PZT)actuator is proposed to improve its drive performance.Based on piezoelectric technology,the actuator adopts the principle of bionics,with a new method of stator inner anchor/loosen/rotor outer drive and a distortion structure of a thin shelf flexible hinge.This structure improves the stability of the anchor/loosen and step rotary.Its characteristics are evaluated by finite element analysis.The experiment shows that the new rotary PZT actuator works with higher frequency(40 Hz),higher speed(325 mrad/s),wider movement(360u),high resolution(1 mrad/step)and high torque(30 N?cm).The novel actuator can be applied in wide movement and high resolution driving devices such as those for optics engineering,precision positioning and some other micro-manipulation fields.
