Multi-cylinder electrohydraulic digital loading technology for reproduction of large load

Lin, Yaolin; Li, Danyang; Gu, YuanTong; Liu, Hongwei; Feng, Xiangheng; Ding, Jinglong

doi:10.1016/j.mechatronics.2021.102559

Cited by 7 publications

(2 citation statements)

References 34 publications

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“…The error average was reduced by 28%. Besides, compared with the results under the same 0.1 Hz sinusoidal loading condition without SMC [31], which was 9.182 kN error range and 1.445 kN error average, the loading accuracy was raised by 25.2% and 49.6%. The improvement demonstrated that the SMC is more effective than the previous full closed-loop PID controller.…”

Section: Resultsmentioning

confidence: 95%

“…The basic loading principle of the MEDSL technology is concluded, and the fourcylinder case has been investigated in the section. A traditionally used single cylinder loading is replaced by the novel electrohydraulic digital-servo cylinders group at each basic loading point [31]. In each loading point within the cylinders group, there are N hydraulic cylinders present.…”

Section: Loading Principlementioning

confidence: 99%

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Multi-Degree-of-Freedom Load Reproduction by Electrohydraulic Digital-Servo Loading for Wind Turbine Drivetrain

Liu

et al. 2023

Energies

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Many drivetrain testing facilities have been built to reproduce multi-degree-of-freedom loads, thus simulating real wind conditions for evaluations of the reliability and durability of turbine subsystems. In this paper, the electrohydraulic schemes for the non-torque loading of a wind turbine’s drivetrain test benches are first analyzed. To deal with the control inaccuracy caused by the drastically increasing loading force, along with the rapid development of large-scale wind turbines, a multi-cylinder electrohydraulic digital-servo loading (MEDSL) technology is proposed. A novel electrohydraulic digital-servo cylinders group is designed. The proposed MEDSL can provide continuous and accurate load recurrence under wider wind conditions by varying the operational area of the cylinders group. Moreover, a sliding mode controller (SMC) is designed to realize the large dynamic loading of the MEDSL system. By comparing the SMC to a traditional PID controller in a servo-valve controlled cylinder, both simulation and experiment results proved the advantage of the proposed SMC. Accordingly, extensive experiments with a 4-cylinder case were carried out on a real full-loading bench using the SMC-based MEDSL device. The excellent tracking performance under complicated signals that represent the real wind loads demonstrated the feasibility and effectiveness of the proposed MEDSL technology and the SMC method.

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Section: Resultsmentioning

confidence: 95%

Section: Loading Principlementioning

confidence: 99%