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Hydraulic square pressure generator for dynamic calibration of pressure sensors at low frequencies

机译：液压方形压力发生器，用于低频动态校准压力传感器

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摘要

A hydraulic square pressure generator with a unique spool valve has been developed for use in a system to calibrate and evaluate the dynamic characteristics of pressure sensors. This hydraulic square pressure generator generates a hydraulic square pressure with a rapid transient response in the time domain and with abundant harmonics in the frequency domain at low fundamental frequencies, rather than square pressure with poor harmonics at high fundamental frequencies. Its rise time and fundamental frequency are around 32.0 us and 5 Hz, respectively, supporting a wide range of dynamic calibration of hydraulic square pressure generators. The sensing cavity in the hydraulic square pressure generator constrains the pressure transient produced by the fluid in the valve and maintains the generated hydraulic square pressure for both tested and reference pressure sensors. Three pressure sensors are calibrated using the hydraulic square pressure produced by the system with an auto-regressive exogenous model. Their transfer functions are obtained by applying the common pole-zero principle to describe their dynamic characteristics in the frequency domain.
机译：具有独特滑阀的液压方形压力发生器已被开发用于系统中，以校准和评估压力传感器的动态特性。该液压方压发生器产生的液压方压在时域中具有快速的瞬态响应，而在低基频下具有频域中的大量谐波，而不是在高基频下具有较弱谐波的方压。它的上升时间和基频分别约为32.0 us和5 Hz，从而支持液压方压发生器的广泛动态校准。液压平方压力发生器中的感应腔可限制阀中流体产生的压力瞬变，并为测试压力传感器和参考压力传感器保持所产生的液压平方压力。使用系统通过自动回归外生模型产生的液压平方压力来校准三个压力传感器。它们的传递函数是通过应用零极点原理来描述它们在频域中的动态特性而获得的。

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