Iterative learning control of electro-hydraulic proportional feeding system in slotting machine for metal bar cropping

Zhao, Shengdun; Wang, Ji; Wang, Lihong; Hua, Chunrong; He, Yupeng

doi:10.1016/j.ijmachtools.2004.10.013

Cited by 23 publications

(10 citation statements)

References 12 publications

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“…[3], an improved adaptive control method was considered by updating controller gains to compensate for parameter fluctuations, but this requires a great deal of calculation. Both repetitive control [4] and iterative learning control [5] can be applied in electrohydraulic systems with periodic action trajectories. These two methods also need a large storage space and a fixed movement starting position.…”

Section: Introductionmentioning

confidence: 99%

State feedback integral control for a rotary direct drive servo valve using a Lyapunov function approach

Zhuang

2015

ISA Transactions

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Section: Introductionmentioning

confidence: 99%

State feedback integral control for a rotary direct drive servo valve using a Lyapunov function approach

Zhuang

2015

ISA Transactions

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“…Several accounts of ILC applied to hydraulic motion control problems have appeared in the literature, see for example (Lingjun et al, 2014), (Chen and Zeng, 2003), (Daley et al, 2004) and (Zhao et al, 2005), where the achieved reduction in the control error vary significantly from one application to another, even for similar or identical ILC algorithms. The reported convergence rates in these applications range from anywhere between 15 and 100 iterations, also for similar algorithms.…”

Section: Discussionmentioning

confidence: 99%

Iterative Learning Applied to Hydraulic Pressure Control

Gøytil¹,

Hansen²,

Hovland³

2018

MIC

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This paper addresses a performance limiting phenomenon that may occur in the pressure control of hydraulic actuators subjected to external velocity disturbances. It is demonstrated that under certain conditions a severe peaking of the control error may be observed that significantly degrades the performance of the system due to the presence of nonlinearities. The phenomenon is investigated numerically and experimentally using a system that requires pressure control of two hydraulic cylinders. It is demonstrated that the common solution of feed forwarding the velocity disturbance is not effective in reducing the peaking that occurs as a result of this phenomenon. To improve the system performance, a combination of feedback and iterative learning control (ILC) is proposed and evaluated. The operating conditions require that ILC be applied in combination with a feedback controller, however the experimental system inherently suffers from limit cycle oscillations under feedback due to the presence of valve hysteresis. For this reason the ILC is applied in combination with a feedback controller designed to eliminate limit cycle oscillations based on describing function analysis. Experimental results demonstrate the efficacy of the solution where the feedback controller successfully eliminates limit cycle oscillations and the ILC greatly reduces the peaking of the control error with reductions in the RMS and peak-to-peak amplitude of the error by factors of more than 30 and 19, respectively. Stability of the proposed solution is demonstrated analytically in the frequency domain and verified on the experimental system for long periods of continuous operation.

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“…All the components of the cropping machine were supplied with commercially available drawing oil as a lubricant. In the cropping process, V-shape notches were cut at specific length intervals in the metal bar with a slotting machine [6] to engender stress concentration at the bottom of these notches.…”

Section: Methodsmentioning

confidence: 99%

A novel type of precision cropping machinery using rotary striking action

Tang

Zhao

Wang

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this article, novel precision bar cropping machinery, with a modified rotary swaging machine, which has been extended by the addition of a stroke adjuster, was designed and built. By adjusting the strike frequency and the radial displacement, a crack can be made to propagate quickly and regularly, leading to a final regular separation of the bar. Precision cropping experiments on several metal bars were conducted, which can be directly used in the subsequent process, such as cold-extrusion and cold-forging and so on because of the high-quality cross-section, high geometric and weight precision using this cropping device.

show abstract

Iterative learning control of electro-hydraulic proportional feeding system in slotting machine for metal bar cropping

Cited by 23 publications

References 12 publications

State feedback integral control for a rotary direct drive servo valve using a Lyapunov function approach

State feedback integral control for a rotary direct drive servo valve using a Lyapunov function approach

Iterative Learning Applied to Hydraulic Pressure Control

A novel type of precision cropping machinery using rotary striking action

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