Details
| Original language | English |
|---|---|
| Pages (from-to) | 292-297 |
| Number of pages | 6 |
| Journal | IFAC Proceedings Volumes (IFAC-PapersOnline) |
| Volume | 51 |
| Issue number | 32 |
| Early online date | 14 Dec 2018 |
| Publication status | Published - 2018 |
| Event | 17th IFAC Workshop on Control Applications of Optimization - Yekaterinburg, Russian Federation Duration: 15 Oct 2018 → 19 Oct 2018 Conference number: 17 |
Abstract
An optomechanical derotator is an optical system that can be used to extend various measurement methods so they can be applied to rotating measurement objects. The function principle is to manipulate the image of the rotating measurement object by means of rotating reflective components inside the derotator. Thus it appears stationary in the measurement data. For this it is inevitably that the angular position and velocity of the derotator are controlled in such way that they always amount to half that of the measurement object. It is therefore necessary to adjust the derotator with the help of an implemented controller. Since we want to acquire the reference input of the control with a high-speed camera and image processing algorithms the sampling time of the control must be adapted to the rather long computation time of the image processing. As a result, the use of analog control techniques is prohibited so that a digital controller has to be implemented. This paper proposes an approach where an image-based discrete-time linear-quadratic regulator is used to satisfy the requirements concerning the angular position and velocity of the derotator. To improve its performance, it is supplemented by integral action and a model-based feedforward control. Furthermore, the image processing algorithms by which the reference input of the control is determined are described. Finally, it is demonstrated that this controller concept produces the desired result by generating a standing image of a rotating object with a camera and the derotator.
Keywords
- discrete-time linear-quadratic regulator, discrete-time optimal feedback control, image-based control, model-based feedforward control, Optomechanical derotator
ASJC Scopus subject areas
- Engineering(all)
- Control and Systems Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: IFAC Proceedings Volumes (IFAC-PapersOnline), Vol. 51, No. 32, 2018, p. 292-297.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Image-based discrete-time optimal feedback control for an optomechanical derotator
AU - Altmann, Bettina
AU - Pape, Christian
AU - Reithmeier, Eduard
N1 - Conference code: 17
PY - 2018
Y1 - 2018
N2 - An optomechanical derotator is an optical system that can be used to extend various measurement methods so they can be applied to rotating measurement objects. The function principle is to manipulate the image of the rotating measurement object by means of rotating reflective components inside the derotator. Thus it appears stationary in the measurement data. For this it is inevitably that the angular position and velocity of the derotator are controlled in such way that they always amount to half that of the measurement object. It is therefore necessary to adjust the derotator with the help of an implemented controller. Since we want to acquire the reference input of the control with a high-speed camera and image processing algorithms the sampling time of the control must be adapted to the rather long computation time of the image processing. As a result, the use of analog control techniques is prohibited so that a digital controller has to be implemented. This paper proposes an approach where an image-based discrete-time linear-quadratic regulator is used to satisfy the requirements concerning the angular position and velocity of the derotator. To improve its performance, it is supplemented by integral action and a model-based feedforward control. Furthermore, the image processing algorithms by which the reference input of the control is determined are described. Finally, it is demonstrated that this controller concept produces the desired result by generating a standing image of a rotating object with a camera and the derotator.
AB - An optomechanical derotator is an optical system that can be used to extend various measurement methods so they can be applied to rotating measurement objects. The function principle is to manipulate the image of the rotating measurement object by means of rotating reflective components inside the derotator. Thus it appears stationary in the measurement data. For this it is inevitably that the angular position and velocity of the derotator are controlled in such way that they always amount to half that of the measurement object. It is therefore necessary to adjust the derotator with the help of an implemented controller. Since we want to acquire the reference input of the control with a high-speed camera and image processing algorithms the sampling time of the control must be adapted to the rather long computation time of the image processing. As a result, the use of analog control techniques is prohibited so that a digital controller has to be implemented. This paper proposes an approach where an image-based discrete-time linear-quadratic regulator is used to satisfy the requirements concerning the angular position and velocity of the derotator. To improve its performance, it is supplemented by integral action and a model-based feedforward control. Furthermore, the image processing algorithms by which the reference input of the control is determined are described. Finally, it is demonstrated that this controller concept produces the desired result by generating a standing image of a rotating object with a camera and the derotator.
KW - discrete-time linear-quadratic regulator
KW - discrete-time optimal feedback control
KW - image-based control
KW - model-based feedforward control
KW - Optomechanical derotator
UR - http://www.scopus.com/inward/record.url?scp=85058151214&partnerID=8YFLogxK
U2 - 10.1016/j.ifacol.2018.11.398
DO - 10.1016/j.ifacol.2018.11.398
M3 - Conference article
AN - SCOPUS:85058151214
VL - 51
SP - 292
EP - 297
JO - IFAC Proceedings Volumes (IFAC-PapersOnline)
JF - IFAC Proceedings Volumes (IFAC-PapersOnline)
SN - 1474-6670
IS - 32
T2 - 17th IFAC Workshop on Control Applications of Optimization
Y2 - 15 October 2018 through 19 October 2018
ER -