Design and analysis for the multi-point flexible support structure of large and precision lens

Zhang, Linmin; Wenpan, Wang; Wang, Jianli; Guo, Peng; Liang, H.

doi:10.1016/j.ijleo.2019.162966

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Yu et al designed a new type of three-leaf flexible structure based on the principle of spring, and optimized the size parameters of the flexible structure through the finite element analysis method [13]. In order to achieve accurate surface shape and optical axis stability of a large aperture lens in a ground-based telescope system that is subject to various load cases, Zhang et al proposed a novel lens support with a multi-point flexible support structure and optimized the support structure based on low-order modes and system accuracy [14]. The above scholars have conducted a lot of research on the support system of optical mirrors.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Disturbance and Error Analysis of Flexible Support System for Large Optical Mirror Processing

Jin

Gu³

2021

Applied Sciences

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To improve the accuracy of a flexible support system (FSS) used for optical mirror processing, the influence of air content in the working medium and ambient temperature change on the FSS is analyzed and studied. First, the disturbance model of the FSS and single support cylinder affected by different air contents in the working medium and ambient temperature is established, and the mapping relationship between the influencing factors and the affected factors is analyzed. Then, the effects of ambient temperature change on volume, support height, and support pressure for different air contents are simulated and analyzed separately. The results of the simulation obtained show that when the working medium is mixed with different volume fractions of air and the ambient temperature changes, upper and lower chamber volumes, support rigidity, and support height of the support cylinder are also changed. Finally, an experimental study of pressure changes in the upper and lower chambers, support height, and support rigidity changes at different ambient temperatures and air contents are carried out. By measuring the support height, support pressure, and support rigidity error, the effectiveness of the established mathematical disturbance model of FSS is further verified. It not only provides a theoretical basis for improving the support accuracy of the FSS but also provides a foundation for the application of the FSS in the processing stage of large optical mirrors.

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Section: Introductionmentioning

confidence: 99%

Dynamic Disturbance and Error Analysis of Flexible Support System for Large Optical Mirror Processing

Jin

Gu³

2021

Applied Sciences

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“…To achieve an accurate surface form and optical axis stability of a large aperture lens in a ground-based telescope system subject to various load cases, Zhang et al, proposed a novel lens support with a multi-point flexible support structure and based on low-order modes and system accuracy to optimize its supporting structure [24]. Wang et al designed a tangential flexible support structure and an axial flexible support structure to compensate for temperature and gravity load disturbances on a large-aperture optical mirror [25].…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Parameter Optimization of Flexible Support System of Optical Mirror

Jin

Pang

et al. 2021

Applied Sciences

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During the processing of an optical mirror, the performance parameters of the bottom support system would affect the surface forming accuracy of the mirror. The traditional bottom support system has a large unadjustable support stiffness, which increases the difficulty of unloading the impact force generated by the grinding disc. In response to this scenario, a flexible support system (FSS) consisting of 36 support cylinders with beryllium bronze reeds (BBRs) and rolling diaphragms (RDs) as key components is designed. It is necessary to analyze the key components of the support cylinder to reduce its axial movement resistance, ensure a consistent force output of each support point. First, the internal resistance model of a flexible support cylinder is established, and the main factors of internal resistance are then analyzed. Thereafter, the multi-objective structural parameters of the BBR and RD are simulated in ANSYS using the control variable method. The optimal structural parameters of BBR and RD are determined by simulation. Finally, experiments are performed on the RD ultimate pressure, internal resistance of the support cylinder, and consistency of the force output of the FSS. The experimental results show that the support cylinder with the optimized design has good force output consistency, which provides a theoretical basis for the application of FSS in optical mirror processing.

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“…Therefore, the imaging performance of the optical window is one of the key technologies restricting the application of a photoelectric load on hypersonic aerial remote sensors [ 5 , 6 ]. In order to meet the image quality requirements of aerial remote sensors under hypersonic flight conditions, it is necessary to rationally design the flexible supporting microstructure of the optical window to reduce the deformation of the window glass and to ensure the resolution and imaging quality of the remote sensor [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Integrated Analysis of a Flexible Support Microstructure with a Honeycomb Sandwich for the Optical Window of a Hypersonic Remote Sensor

Zhang

Ding

Sun

et al. 2021

Sensors

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In order to reduce the influence of the optical window on the image quality of a hypersonic visible light optical remote sensor, we propose a method of adding a double-layer semicircular honeycomb core microstructure with flexible support of a high temperature elastic alloy between a window glass and a frame to reduce the influence of complex thermal stress on the surface accuracy of the optical window. An equivalent model of a semicircular honeycomb structure was established, the elastic parameters of the semicircular honeycomb sandwich microstructure were derived by an analytical method, and a numerical verification and finite element simulation were carried out. The results show that the equivalent model is in good agreement with the detailed model. The optical-mechanical-thermal integrated simulation analysis of the optical window assembly with flexible supporting microstructure proves that the semicircular honeycomb sandwich flexible supporting structure has a positive effect on stress attenuation of the window glass and ensures the wave aberration accuracy of the transmitted optical path difference of the optical window (PV < 0.665 λ, RMS < 0.156 λ, λ = 632.8 nm). Combined with the actual optical system, the optical performance of the window assembly under the flexible support structure is verified. The simulation results show that the spatial frequency of the modulation transfer function (MTF) of the optical system after focusing is not less than 0.58 in the range of 0–63 cycle/mm and the relative decline of MTF is not more than 0.01, which meet the imaging requirements of a remote sensor. The study results show that the proposed metal-based double-layer semicircular honeycomb sandwich flexible support microstructure ensures the imaging quality of the optical window under ultra-high temperature conditions.

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Design and analysis for the multi-point flexible support structure of large and precision lens

Cited by 7 publications

References 2 publications

Dynamic Disturbance and Error Analysis of Flexible Support System for Large Optical Mirror Processing

Dynamic Disturbance and Error Analysis of Flexible Support System for Large Optical Mirror Processing

Multi-Objective Parameter Optimization of Flexible Support System of Optical Mirror

Design and Integrated Analysis of a Flexible Support Microstructure with a Honeycomb Sandwich for the Optical Window of a Hypersonic Remote Sensor

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