High precision massive shape control of magnetically levitated adaptive mirrors

Manetti, Mauro; Morandini, Marco; Mantegazza, Paolo

doi:10.1016/j.conengprac.2010.07.002

Cited by 20 publications

(51 citation statements)

References 24 publications

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“…2, comprises a thin, continuous reflective shell, standing some tens of µm from a rigid reference structure, controlled though Fig. 2 Mirror shell and reference structure section, reprinted from [11], Copyright (2010), with permission from Elsevier many hundreds of co-located sensors/actuators pairs. The thin air cushion entrapped between the mirror and the underlying reference body can exert an important elasto-damping action.…”

Section: System Modelmentioning

confidence: 99%

“…Even if a relatively small number of modes could be sufficient for an acceptable approximation of the mirror dynamics, the need to correctly and precisely represent complex deformations imposes to use a number of modes at least equal to the number of actuators, significantly higher eventually. The exact static response can be recovered through an appropriate static residualization of the high frequency modal shapes [11].…”

Section: Mechanical Modelmentioning

confidence: 99%

“…A detailed description of the proposed control law can be found in [11]. This section recalls its peculiarities, highlighting the improvements with respect to the solution implemented for already operative adaptive mirrors with the same technology.…”

Section: Control Strategymentioning

confidence: 99%

“…The controller proposed in [11] is here adopted and its effectiveness against existing control law is highlighted. The main advantages can be resumed in an improved tracking capability, robustness and rejection of external disturbances.…”

Section: Introductionmentioning

confidence: 99%

“…A detailed description of the mechanical system model, encompassing the elastic structure, the sensors, the actuators and the digital controller can be found in [11]. Such a model is here complemented by taking into account: the air affecting the mirror response through the fluid film interposed between the shell and its reference plane and the local turbulence disturbances directly impinging onto the mirror surface.…”

Section: Introductionmentioning

confidence: 99%

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Servo-fluid-elastic modeling of contactless levitated adaptive secondary mirrors

2011

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The paper develops a comprehensive approach for the servo-fluid-elastic modeling of electromagnetically levitated secondary adaptive mirrors. The system modeling includes the mirror structural dynamics model, its interaction with the fluid film interposed between the mirror and its reference backplate and disturbances due to local air turbulence. The accuracy of the proposed fluid dynamic model is assessed by comparing it with a significant sample of high fidelity 3D Navier-Stokes analyses. The simulation tool is then used to demonstrate the effectiveness and robustness of a recently proposed control, based on a system dynamics cancellation and an iterated steady state feedforward contribution. The simulations clearly highlights the improvements achievable implementing the new control scheme.

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Section: System Modelmentioning

confidence: 99%

Section: Mechanical Modelmentioning

confidence: 99%

Section: Control Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Servo-fluid-elastic modeling of contactless levitated adaptive secondary mirrors

2011

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Computational and Experimental Study on the Critical Unstable Shape of Cold‐Rolled Strip

Song

Shen

Jiang

et al. 2015

steel research int.

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In this paper, the effect of transverse thickness difference and width-to-thickness ratio on the critical unstable shape of cold-rolled strip is studied computationally and experimentally. Firstly, the influence model under actual working conditions is developed by referring to the basic relationship between transverse thickness difference and shape under ideal conditions. After that, the combined influence of transverse thickness difference and width-to-thickness ratio on the critical unstable shape is analyzed based on the elastic sheet stability model. Experimental validations demonstrate that during the production of ultrathin strip steel with different width-to-thickness ratios, the loading roller shapes should be fine adjusted according to the transverse thickness difference of input strips. Therefore, the variation of transverse thickness difference of output strips can meet the requirement of shape stability, so as to obtain fine shape.

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Intelligent Shape Regulation Cooperative Model of Cold Rolling Strip and Its Application

Yang

Wang

et al. 2017

steel research int.

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A new strip shape control model is established to achieve the synchronizing control of complex shape defects, which can not only takes advantage of the mechanism model's strong analysis ability, but also combines with the fast online calculation function of intelligent model to reduce the poor efficiency regulation. Firstly, the dynamic target strip shape is expressed with the Legendre polynomial contained various components to describe all kinds of online shape targets, so it is easier to compare the shape control effect. Secondly, with the dynamic influence matrix and the efficiency function, some different control methods can be tightly combined in one regulation cycle to carry out the synchronous parallel control and the serial relay regulation, respectively. At the same time, by the DE‐ELM method, the intelligent shape control model can play an important role to improve the regulation efficiency of the online strip shape. On the other hand, the collaboration regulation model can make full use of all the effectiveness of each control methods according to their respective characteristics, so that the high precision of the strip shape control is able to be obtained.

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High precision massive shape control of magnetically levitated adaptive mirrors

Cited by 20 publications

References 24 publications

Servo-fluid-elastic modeling of contactless levitated adaptive secondary mirrors

Servo-fluid-elastic modeling of contactless levitated adaptive secondary mirrors

Computational and Experimental Study on the Critical Unstable Shape of Cold‐Rolled Strip

Intelligent Shape Regulation Cooperative Model of Cold Rolling Strip and Its Application

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