Analysis of dynamic characteristics of pressure sensors using square pressure wave theory and system identification

摘要

Most analyses on pressure sensors focus mainly on their static characteristics, while their dynamic characteristics have rarely been explored. In the field of applied engineering, a pressure sensor with a quick response rate and high stability is required to reflect the dynamic behaviour of the hydraulic system. This study developed a square pressure wave generator to replace the traditional directional control valve. The developed generator can generate a square pressure wave of as high as 2 kHz and can achieve high-frequency switching by utilizing the differential principle through a series of mechanical rotations between the revolving spindle and revolving ring. The square pressure wave generated is input into the hydraulic system while the output voltage signals given by the pressure sensor can be analysed by spectrum analysis and system identification to obtain various dynamic characteristics of the pressure sensor, including transfer function, natural resonance frequency and damping ratio.