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Study on Bandwidth Frequency of Servovalve based on Metering Cylinder
S. D. Kim(김성동),Wen-Long An(안문용),S. H. Jeon(전세형) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.3
In this study, a metering cylinder was constructed, and the velocity obtained from the linear velocity transducer (LVT) of the cylinder piston was used to evaluate the dynamic performance of an electro-hydraulic servovalve. Frequency response experiments involving the spool displacement and piston velocity (LVT signal) were conducted with different input signal amplitudes, hydraulic pipe diameters, and supply pressures. The spool displacement signal accurately reflected the performance of the servovalve. Meanwhile, the -3 dB bandwidth frequency of the LVT signal was similar to the spool displacement signal, except for a small-amplitude input signal, and the -90° phase lag bandwidth frequency showed some differences.
A Research on the Bandwidth Frequency of Servo Valves Based on the Dynamic Flow Rate
S. D. Kim(김성동),Wen-Long An(안문용),S. H. Jeon(전세형) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
In this paper flow rate signal and spool displacement signal were adopted to investigate the bandwidth frequency of servo valve. Spool displacement and flow rate dynamic response experiments on different input signal and hydraulic pipe diameter were implemented. The spool displacement dynamic response remains stable throughout, so it can be received accurately reflects the authentic performance of servo valve. Meanwhile the flow rate signal is easy disturbed by hydraulic environment and deviate from the spool displacement signal in small input signal and phase lag.