Yung-Tien Liu

Application of the nonlinear, double-dynamic taguchi method to the precision positioning device using combined piezo-vcm actuator

In this research, the nonlinear, double-dynamic Taguchi method was used as design and analysis methods for a high-precision positioning device using the combined piezo-voice-coil motor (VCM) actuator. An experimental investigation into the effects of two input signals and three control factors were carried out to determine the optimum parametric configuration of the positioning device. The double-dynamic Taguchi method, which permits optimization of several control factors concurrently, is particularly suitable for optimizing the performance of a positioning device with multiple actuators. In this study, matrix experiments were conducted with L9(34) orthogonal arrays (OAs). The two most critical processes for the optimization of positioning device are the identification of the nonlinear ideal function and the combination of the double-dynamic signal factors for the ideal functions response. The driving voltage of the VCM and the waveform amplitude of the PZT actuator are combined into a single quality characteristic to evaluate the positioning response. The application of the double-dynamic Taguchi method, with dynamic signal-to-noise ratio (SNR) and L9(34) OAs, reduced the number of necessary experiments. The analysis of variance (ANOVA) was applied to set the optimum parameters based on the high-precision positioning process

A novel precision positioning table utilizing impact force of spring-mounted piezoelectric actuator—part I: experimental design and results

This paper proposes a novel high-precision and large-stroke positioning table utilizing the spring-mounted piezoelectric actuator. An experimental setup with the actuation along one direction in the horizontal plane was configured to elucidate the characteristics of the positioning table. Several parameters, e.g. the waveform and the amplitude of applied voltage, the mass ratio, and the stiffness of spring, which affect the motion behavior of the table were examined and discussed. The experimental results show that the proposed actuator can actuate a heavy table by utilizing the impact force of a piezoelectric element while maintaining the comparatively long operational range of the initially compressed spring.

A novel precision positioning table utilizing impact force of spring-mounted piezoelectric actuator—part II: theoretical analysis

Abstract A simple mechanical vibration model was formulated to analyze the dynamic characteristics of the precision positioning table utilizing a spring-mounted piezoelectric actuator. The formulated model was validated by comparing the results of numerical simulations with the experimental data of Part I. The performance of the precision positioning table was predicted by changing the parameters of mass ratio and stiffness of spring. It is found that the analytic method described in this paper can provide an effective means in designing the precision positioning table utilizing a spring-mounted piezoelectric actuator.