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This paper presents the optimal design of a compliant guide mechanism (CGM) for high precision CNC turning manufacturing. Genetic algorithm (GA) and finite element analysis (FEA) are used during the optimization process of the mechanism. Before the implementation of GA, sensitivity analysis of design variables is performed by using the combination of FEA-based experiments, Taguchi method and variance...
This study examined university teachers' perceptions of the role of humor in English as a Foreign Language (EFL) teaching, teachers' practices of humor use, and teachers' preferences regarding humor types in the context of Vietnam. An ethnographic approach was employed in this study, combining observations, fieldnotes and interviews. The findings revealed that teachers acknowledged several beneficial...
This paper presents the design of a selective-actuation flexure parallel mechanism that can provide three independent translational motions. The mechanism can be used as an ultra precision positioning system. The modeling of the flexure parallel mechanism is then established based on a pseudo-rigid body model and the compensation of the flexure deformation. The factor of deformation allows...
Micro linear actuators are applied to many precision fields such as ultra-precise positioning, precision manufacturing, optics, etc. The design of a micro-linear actuator is presented in this paper. The micro linear actuator includes a stacked piezo and a novel flexure-based differential amplifier mechanism. Stiffness, one of the most important factor to the resolution, is considered in the design...
The concept of selective actuation (SA) is introduced in flexure parallel mechanism (FPM) design. A selectively actuation FPM has decoupled motion mechanical structure as well as a modularly mounted 1-DOF actuator for each motion axis of the FPM. The kinematic structure of SA-FPM is obtained based on the diagonal form of the manipulator Jacobian and screw-based synthesis approach. The flexure structure...
Stiffness plays an important role in the precise performance of flexure-based ultra-precision manipulation systems. The finite element method (FEM) is currently used to determine the stiffness of the flexure parallel mechanism (FPM) with specified dimensions and free shape. This paper presents the stiffness model based on the way the flexure members are connected together in serial or parallel combinations...
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