Integrated framework for jitter analysis combining disturbance, structure, vibration isolator and optical model

Lee, Dae-Oen; Yoon, Jae-San; Han, Jae‐Hung

doi:10.1117/12.915428

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…Let r xi , r yi , and r zi , represent cosα i , cosβ i , and cosγ i , respectively. From ( 16) and ( 17), the excitation load vector F can be expressed as (18).…”

Section: Vibration Transmissibilitymentioning

confidence: 99%

“…Vibration can be classified in two categories: translational vibration and rotational vibration [14,15]. Some optical systems such as astronomical telescopes, laser communication devices, and long focal length airborne cameras have very sensitive line-of-sight (LOS) and require very high pointing accuracies [16][17][18][19][20][21][22]. For example, the National…”

Section: Introductionmentioning

confidence: 99%

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Design Methodology of a Passive Vibration Isolation System for an Optical System With Sensitive Line-of-Sight

Dai

Wang

et al. 2021

Photonic Sens

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The performance of an optical system with sensitive line-of-sight (LOS) is influenced by rotational vibration. In view of this, a design methodology is proposed for a passive vibration isolation system in an optical system with sensitive LOS. Rotational vibration is attributed to two sources: transmitted from the mounting base and generated by modal coupling. Therefore, the elimination of the rotational vibration caused by coupling becomes an important part of the design of the isolation system. Additionally, the decoupling conditions of the system can be obtained. When the system is totally decoupled, the vibration on each degree of freedom (DOF) can be analyzed independently. Therefore, the stiffness and damping coefficient on each DOF could be obtained by limiting the vibration transmissibility, in accordance to actual requirements. The design of a vibration isolation system must be restricted by the size and shape of the payload and the installation space, and the layout constrains are thus also discussed.

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“…Let r xi , r yi , and r zi , represent cosα i , cosβ i , and cosγ i , respectively. From ( 16) and ( 17), the excitation load vector F can be expressed as (18).…”

Section: Vibration Transmissibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design Methodology of a Passive Vibration Isolation System for an Optical System With Sensitive Line-of-Sight

Dai

Wang

et al. 2021

Photonic Sens

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“…Typically, a simplifying assumption is made that the mass imbalances are coplanar, ie, ϕ = 0, and the vectors F 1 and T 1 are perpendicular. In addition to the mass imbalance disturbances, wheel can also generate other harmonics at integer or noninteger multiples of the fundamental frequency Ω and broadband noise . These additional perturbations are caused among other things by irregularities, lubrication and friction in the ball bearings, and motor drive operation.…”

Section: System Modelingmentioning

confidence: 99%

“…In addition to the mass imbalance disturbances, wheel can also generate other harmonics at integer or noninteger multiples of the fundamental frequency Ω and broadband noise. 28,[30][31][32] These additional perturbations are caused among other things by irregularities, lubrication and friction in the ball bearings, and motor drive operation. Experimental studies given in the works of Kim 28 and Addari et al 33 also show that some wheels can even generate axial forces F z along the z-axis.…”

Section: Reaction Wheel and Flexible Supportmentioning

confidence: 99%

Robust microvibration mitigation and pointing performance analysis for high stability spacecraft

Preda

Cieslak

Henry

et al. 2018

Intl J Robust & Nonlinear

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Summary This paper deals with the development of a mixed active‐passive microvibration mitigation solution capable of attenuating the transmitted vibrations generated by reaction wheels to a satellite structure. A dedicated simulation environment, provided by the European Space Agency and Airbus Defence and Space industries, serves as a support for testing the proposed solution at satellite level. This paper covers modeling, control system design, and worst‐case analysis for a typical satellite observation mission that requires high pointing stability. Combined with a novel disturbance model for the reaction wheel perturbations, the pointing performance and stability requirements are reformulated as bounds on the worst‐case L2 system gains. Subsequently, the active microvibration controller is tuned to manage the conflicting design goals and optimize different trade‐offs between robustness and performance. Finally, robust stability margins and worst‐case performance bounds with respect to various system uncertainties, time‐varying reaction wheel spin rates, actuator saturation, and time delays are obtained using the structured singular value, integral quadratic constraints, and time‐domain nonlinear simulations.

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“…[21] and others have developed a vibration isolation device, which has been used in optical loading satellite experiments. Lee [22] established a complete frame disturbance and vibration isolation optical system model, and studied the control technology of disturbance caused by reaction flywheel. In the error analysis of the National Ignition Facility (NIF), the dynamic error accounts for 92% of the total error, while the static error only accounts for 8%, and 60% of the dynamic error comes from structural vibration [23].…”

Section: Introductionmentioning

confidence: 99%

Optomechanical Coupling Active Control for Improving Beam Pointing Accuracy of the Spatial Filter in PW Laser Facility

et al. 2021

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To improve the beam pointing accuracy of PW laser facility and reduce the optical axis deviation caused by the deflection amplitude response deviation of the confocal lens of spatial filter for microvibration action, an Optomechanical coupling vibration active control theory is proposed to make the peak value of output optical angle response lower than the pointing threshold value by 0.2 µrad. To establish an Optomechanical coupling vibration active control system, the active control parameters are introduced into the beam transmission matrix of the Optomechanical coupling system. The active control parameters and the peak value of the output light angle response are linked point to point. The algorithm flow of the active control system is designed, the control rules are established, and the control effect is verified. The results show that the peak value of the output optical angle response of the spatial filter decreases by 98.13%, and the attenuation is nearly two orders of magnitude after the active control, which effectively improves the convergence accuracy of the beam pointing of the spatial filter of the PW laser facility, and realizes the beam pointing control under the broadband excitation, and the control result is consistent with the expectation.

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Integrated framework for jitter analysis combining disturbance, structure, vibration isolator and optical model

Cited by 8 publications

References 7 publications

Design Methodology of a Passive Vibration Isolation System for an Optical System With Sensitive Line-of-Sight

Design Methodology of a Passive Vibration Isolation System for an Optical System With Sensitive Line-of-Sight

Robust microvibration mitigation and pointing performance analysis for high stability spacecraft

Optomechanical Coupling Active Control for Improving Beam Pointing Accuracy of the Spatial Filter in PW Laser Facility

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