Dr. Valeri P. Mikhailov Profile

Dr. Valeri P. Mikhailov

at Bauman Moscow State Tech

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Author

Publications (4)

Proceedings Article | 6 October 2000 Paper

Control of adaptive optic element displacement with the help of a magnetic rheology drive

Eugeny Deouline, Valeri Mikhailov, Victor Sytchev

Proceedings Volume 4231, (2000) https://doi.org/10.1117/12.402755

KEYWORDS: Magnetism, Mirrors, Liquids, Control systems, Adaptive optics, Control systems design, Astronomical telescopes, Adaptive control, Optical components, Radon

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The control system of adaptive optic of a large astronomical segmentated telescope was designed and tested. The dynamic model and the amplitude-frequency analysis of the new magnetic rheology (MR) drive are presented. The loop controlled drive consists of hydrostatic carrier, MR hydraulic loop controlling system, elastic thin wall seal, stainless seal which are united in a single three coordinate manipulator. This combination ensures short positioning error δφ⪅50 nm and small time of response. The main feature of a large astronomical telescope (diameter 25 m) is the large number (in our case 512) of primary mirror segments usage, which are united in one reflecting system. This design makes easier the problem of the primary mirror manufacturing but brings another problem to ensure precise movement of every mirror segment movement and to provides a perfect coincidence of the mirror segments constantly. Suggested parameters of the drive, based on magnetic rheology (MR) liquid are: precision δφ⪅50 nm, time of response T≤0.2 s. Error of positioning of loop-controlled MR drive may be expressed: δφ = δ_r + δ_db + δ_f + δ_i, where δ_r -- 'reproduction' error (depends on drive structure and controlling system, and in our case the drive ensures δ_r = 0); δ_db -- 'disturbance' error (δ_db = 5...10 nm); δ_f -- error, because of static friction forces action (δ_f equals k_t x F_st = 2 x I_s/k_i = 30 nm, where k_t -- transformation coefficient of the drive; F_st -- static force in the drive; I_s -- 'starting' current in the drive; k_i -- transformation coefficient of the measuring system); δ_i -- 'instrumental' error. In case of a laser interferometer usage δ_i = 10 nm and the summarized error is δφ≤50 nm. Time of response T of the drive depends mainly on the combination of time constants of the next elements: MR-valve T_m, elastic elements (pipes, thin-wall tubes, bellows) T_el, moved object (mirror segments) T_s. Experiments show what the MR drive ensures: T_m = 20 ms, T_cl = 20 ms, T_s = 100 ms. Analysis of the amplitude-frequency graphs shows, that the MR-drive ensures summarized time of response till T≤110 ms.

Proceedings Article | 20 July 2000 Paper

Parameters of loop-controlled magnetic rheology drive for segmented large mirror

Eugeny Deouline, Valeri Mikhailov, Oleg Eliseev, Victor Sytchev

Proceedings Volume 4003, (2000) https://doi.org/10.1117/12.391520

KEYWORDS: Magnetism, Mirrors, Liquids, Control systems, Control systems design, Signal processing, Astronomical telescopes, Laminated object manufacturing, Manufacturing, Optical design

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Proceedings Article | 4 November 1999 Paper

Precision of scanning magnetic and electric rheology X-Y-Z manipulators

Eugeny Deuline, Valeri Mikhailov, Oleg Eliseev, Victor Sytchev

Proceedings Volume 3898, (1999) https://doi.org/10.1117/12.368491

KEYWORDS: Magnetism, Scanning tunneling microscopy, Control systems, Liquids, Actuators, Interferometers, Thulium, Error analysis, Control systems design, Photonics systems

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Proceedings Article | 21 March 1997 Paper

New high-precision magnetic rheology drives for segmented primary mirror of adaptive telescope

Valeri Anisimov, Eugeny Deouline, Valeri Mikhailov, Valery Kaspersky, Victor Sytchev

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269031

KEYWORDS: Mirrors, Magnetism, Telescopes, Control systems, Actuators, Liquids, Control systems design, Reflector telescopes, Manufacturing, Analytical research

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