Method of generating a hydraulic step wave with a short rise time

A hydraulic step wave calibrator (HSC) was newly developed herein to generate a hydraulic step wave with a short rise time that can be utilized to investigate dynamics of hydraulic components with a short response time. The design of the HSC was similar to a general spool valve comprising a spool and a steel housing. A quick-opening mechanism and a tiny sensing cavity were utilized in the HSC to reduce the rise time of the generated hydraulic wave. The experimental results indicate that the dynamic performance of the HSC at various conditions. With the short rise time between 21 and 54 μs, the HSC can be regarded as an extension of hydraulic sock tubes towards low frequencies. The hydraulic step wave generated by the HSC covered a range of dynamic calibration of hydraulic components that current hydraulic wave generators have not achieved yet.