Mr. Wenyi Chai Profile

Wenyi Chai

at Xi'an Institute of Optics

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Publications (3)

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Proceedings Article | 20 December 2019 Paper

Design of CPA reflective mirror in space laser communication via multi-objective optimization

Yang Song, Yongming Hu, Wenyi Chai, Jing Ye, Wei Xin, Bin Hu, Chenjie Wang

Proceedings Volume 11209, 112090D (2019) https://doi.org/10.1117/12.2542590

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The research on space laser communication has become a hotspot in recent years. The research trend of it is high speed transferring, networking and integration. Integration design means that the structure should be compact and reliable. CPA (Coarse Pointing Assembly) is an important component in space laser communication system. The paper makes design of CPA reflective mirror. On one hand, it is expected that the reflective mirror is as light as possible with small size. On the other hand, it is expected that the structure is reliable with high stiffness. These two aspects are contradict. And several factors make influence on these two aspects, such as the thickness of mirror, the size of bottom holes, the thickness of ribs and so on. The paper makes sensitivity analysis and chooses proper design variables for further optimization. And then, the paper makes a multi-objective optimal design based on factors mentioned above. In the process of optimization, a special objective function is deduced. At last the optimal design is obtained. The result shows that optimal design scheme has good characteristics.

Proceedings Article | 17 May 2019 Paper

Structural parameters optimization of lens hood based on a kind of surrogate model

Yang Song, Wenyi Chai, Wei Xin, Yang Xu, Yongming Hu

Proceedings Volume 11170, 1117002 (2019) https://doi.org/10.1117/12.2531069

KEYWORDS: Optimization (mathematics), Finite element methods, Laser systems engineering, Structural design, Laser development

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With the wide use of earth-based laser communication system, more and more engineers like to pursue the design of lightweight structure. Nowadays, engineers often firstly depend on the project experience to design the lens hood, then make analysis based on finite element method to verify its feasibility, but it costs too much time. The paper attempts to give a new optimization design method. Surrogate model are widely used in the fields of aerodynamics parameters optimization, but barely used in design of optical structure. The paper makes an optimal design about lens hood with wide aperture based on surrogate model. First of all, the paper generates some samples by finite element method; secondly, uses the samples to get the surrogate model by surface interpolation; then finds the optimal solution by surrogate model and constraint conditions. The aperture of the lens hood in this paper is 450 mm. One end of the lens hood is attached to main structure, and the other end is free. Middle part of the lens hood is supported by rods which are made of carbon fiber. The optimization variables in this paper is the thickness of the lens hood and the location of the supports robs. The purpose of the optimization is to find the case that the weight is light and displacement of the free end is small. It will not let the miscellaneous light make a negative effect on incident or outgoing path of light. In other words, it will ensure the quality of imagining or effect of detection. The appropriate solution is found by the method proposed in this paper.

Proceedings Article | 20 February 2018 Paper

Design of spatial oval plane mirror and its support structure

Wenyi Chai, Yongming Hu, Chenjie Wang, Su Chen, Song Feng

Proceedings Volume 10697, 1069752 (2018) https://doi.org/10.1117/12.2307063

KEYWORDS: Mirrors, Optical components, Photovoltaics, Structural design, Lightweight mirrors, Zerodur, Mirror structures, Thermodynamics, Satellites, Mirror stabilization

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For the diameter of 150mm elliptical flat mirror that used in the space, selected the zerodur material and a lightweight design is conducted in the way of selected back-open-architecture with symmetrical axisymmetric arrangement, and in order to evaluate the effect of thermal stress from -10°C to 45°C on the mirror, a reflection mirror is designed based on the multipoint flexible support. The mirror component's mechanic and thermodynamic characteristics is analyzed with the simulation software, the support structure parameters are optimized, that can be used to evaluate the effect of gravity, assembly stress, and thermal stress load on mirror, while ensuring the component's stiffness and strength. According to the design condition developed a product and carried out mechanic and thermodynamic environment, the product could meet the shape accuracy PV λ/3, RMS λ/30 in the condition of thermodynamic environment, and the shape accuracy PV λ/5, RMS λ/40 in the condition of ground gravity and assembly stress (λ=632.8nm), while the product can withstand with the mechanical oscillation environment sinusoidal oscillation 10g, RMS random oscillation acceleration 14.4g.

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