Piezoelectric drive hydraulic amplification flexible Braille contact device design and experiment

Abstract

The purpose of this paper is to use the principle of hydraulic amplification and design a piezoelectric drive-based hydraulically amplified flexible Braille contact device with good performance output. In this paper, the structure and working principle of the Braille contact device are described, and the theoretical analysis and parametric design of the hydraulic amplification unit are carried out. The influence relationship between the displacement amplification and diameter and height of the reservoir are obtained by using MATLAB simulation analysis, whereas the output displacement of the piezoelectric vibrator and the flexible film under different driving voltages is measured by using a laser micrometer. Subsequently, the experiments are consistent with the theoretical analysis, and the correctness of the theoretical analysis is verified. Finally, experimental tests of the system are implemented. The results suggest that the displacement amplification ratio is 4.16, and the contact displacement formed by the flexible film is 0.226 mm. Thus, the requirements of the touch sensitivity standard for the blind are satisfied when the reservoir diameter is 20 mm and the reservoir height is 3 mm. The filling water is 7.5 ml, and the resonance frequency is 317.5 Hz. This study proves that constructing a Braille bump device in this way is feasible as well as effective.