Robust H.INF. DIA Control of Levitated Steel Plates

Namerikawa, Toru; Mizutani, Daisuke; Kuroki, Shintaro

doi:10.1541/ieejias.126.1319

Cited by 9 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, elastic vibration is induced because of the flexibility arising from the plate thickness and area; therefore, the stability at the time of levitation is significantly impaired. Prior research has indicated the size of the objective steel plate to be relatively small, and no successful report has been made on a stable noncontact conveyance system of a very thin steel plate, despite the increasing demand in the recent years [5,6]. In the past, our research group has constructed an electromagnetic levitation control system in which the relative distance between the electromagnet and a steel plate was maintained, aimed to prevent the steel plate from falling from the conveyor or contacting the electromagnet during electromagnetic levitation conveyance.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Levitation Control for Bending Flexible Steel Plate: Experimental Consideration on Disturbance Cancellation Control

et al. 2018

View full text Add to dashboard Cite

Abstract:When an ultrathin and flexible steel plate is to be levitated, levitation control becomes difficult because the ultrathin steel plate undergoes increased flexure. We herein propose a levitation method for an ultrathin steel plate that is bent to an extent that does not induce plastic deformation. In this study, to investigate the levitation stability of an ultrathin steel plate, we applied disturbance cancellation control in the bending levitation system. The object of electromagnetic levitation was a rectangular zinc-coated ultrathin steel plate (SS400) of length 800 mm, 600 mm, and thickness 0.19 mm. The vibrator was attached below the three frames, in which the electromagnet unit was installed so that the frames could be vibrated up and down. We conducted experiments on the levitation performance when the electromagnet was displaced by the frame vibration in the bending levitation system. The results showed that a stable levitation can be achieved even with an input of external disturbance when levitating at the optimum bending angle.

show abstract

Section: Introductionmentioning

confidence: 99%

Electromagnetic Levitation Control for Bending Flexible Steel Plate: Experimental Consideration on Disturbance Cancellation Control

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In particular, a method using an electromagnetic force has been considered and actively examined (Ohji et al, 2011) (Sato and Torii, 2008). Namerikawa et al (2006) demonstrated the stable non-contact support of a 0.3 mm thin steel plate by incorporating a control method that considers its rigid-body motion. Furthermore, Nakagawa et al (2000) successfully achieved noncontact transfer by determining the horizontal position using the sideslip caused by inclining a 1.6 mm steel plate.…”

Section: Introductionmentioning

confidence: 99%

Study on stability improvement by applying electromagnetic force to edge of non-contact-gripped thin steel plate

Narita

Kurihara

Kato

2016

Mechanical Engineering Journal

View full text Add to dashboard Cite

Nowadays, thin steel plates with high surface quality are required. However, the quality of steel plates is adversely affected by transport using the friction force generated by contact with rollers in the manufacturing process. As a solution to this problem, the non-contact transport of steel plates using an electromagnetic force has been proposed. When a steel plate has sufficient stiffness owing to its material or size, it can be levitated by a levitation system consisting of actuators installed in the vertical direction. On the other hand, it is difficult for very thin steel plates to levitate because of the deflection at locations where an attractive force is not applied. To improve the levitation performance of the conventional magnetic levitation system, we have proposed the addition of an electromagnet to control the horizontal displacement of the steel plate. However, there have been no detailed examinations of by how much the levitation stability of a steel plate is improved by the suppression of deflection. In this study, we obtained the shape of a levitated steel plate by electromagnetic field analysis and deformation analysis and evaluated the obtained shape of the steel plate. Furthermore, a levitation experiment was performed to verify the levitation stability of this system. The results show that the addition of an electromagnet in the horizontal direction is effective for achieving stable levitation.

show abstract

“…Namerikawa is with Division of Electrical Engineering and Computer Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192 JAPAN. toru@t.kanazawa-u.ac.jp evaluate its effectiveness via control experiments [8], [9]. The magnetically suspended steel plate is a four-input and fouroutput MIMO system and it is unstable and infinite dimensional system.…”

Section: Introductionmentioning

confidence: 99%

GIMC-based switching control of magnetically suspended steel plates

Maruyama

Namerikawa

2006

2006 IEEE Conference on Computer Aided Control System Design, 2006 IEEE International Conference on Control Applications, 2006

Self Cite

View full text Add to dashboard Cite

Abstract-This paper deals with robust control of magnetically suspended steel plates by using a switching control based on Generalized Internal Model Control (GIMC) structure. First, we derive a mathematical model for the magnetically suspended steel plate. The system is a multi-input and multioutput unstable mechatronic system. Then we design a robust controller which achieves both of high performance and high robustness for the magnetically suspended steel plates. GIMC structure is constructed with a general outer feedback loop and an inner loop. The outer-loop controller is a nominal high performance controller and it can be used for the nominal plant. On the other hand, the inner-loop controller is designed via the parameterization of a set of stabilizable controllers. Finally, several experimental results show that the GIMC structure based switching controller has both of high performance for the nominal plant and the high robustness for the perturbed plants compared with a μ controller.

show abstract

Robust H.INF. DIA Control of Levitated Steel Plates

Cited by 9 publications

References 3 publications

Electromagnetic Levitation Control for Bending Flexible Steel Plate: Experimental Consideration on Disturbance Cancellation Control

Electromagnetic Levitation Control for Bending Flexible Steel Plate: Experimental Consideration on Disturbance Cancellation Control

Study on stability improvement by applying electromagnetic force to edge of non-contact-gripped thin steel plate

GIMC-based switching control of magnetically suspended steel plates

Contact Info

Product

Resources

About