Xidian University

Baoyan Duan

Yiqun Zhang

Peng Li

Ning Han

Hui Qiao

Yu He

Dongxu Wang

Bi Cheng

Lizhi Zeng

Hong Bao

Guanheng Fan

Boyuan Ma

Kunpeng Liu

Xuechao Duan

Shufei Feng

Shibo Jiang

Shimin Cao

A design method of a multi-zone grouped and light-homogenized Fresnel lens for a concentrating system includes: step 1, designing, according to a basic principle of a Fresnel lens, a planar Fresnel lens; step 2, establishing, according to an optical path characteristic of the concentrating system, an optical path equation of the concentrating system; step 3, determining a differential form of uniform distribution of luminous energy density; and step 4, based on the step 3, calculating design parameters of the multi-zone grouped and light-homogenized Fresnel lens to obtain the multi-zone grouped and light homogenized Fresnel lens. The obtained Fresnel lens can realize low-power concentrating, solve the problem that luminous energy is too concentrated under a high-power light-concentrating ratio, achieve high-uniformity design under different light-concentrating ratios, and improve the light-homogenized performance of the concentrating system, thereby solving non-uniform luminous energy density distribution on a surface of a photovoltaic cell.

Method of multi-zone grouped and light-homogenized Fresnel lens for concentrating system

A mounting base for supporting and rotating an instrument about two perpendicular axes is disclosed. The mounting base includes a vertical column; a rotatable platform attached to the column by a revolute joint; a rail around the column; at least one rod, an end of the at least one rod connecting with the revolute joint; at least one sliding mechanism, connecting with the other end of the at least one rod, the sliding mechanism sliding on the rail. The mounting base is light and easily controlled with arbitrary azimuth.

Two-axis mounting base

An optimizing design method for a chassis structure of electronic equipment is disclosed, including: investigating from the point of view of mechanical, electric and thermal three-field coupling, determining the preliminary design size of the chassis, performing a mechanical analysis by using a mechanical analysis software such as ANSYS; converting the mesh model among the three-fields, obtaining the mesh model used for the electromagnetic and thermal analyses; setting the thermal analysis parameters, performing the thermal analysis by using an electromagnetic analysis software such as ICEPAK; determining a resonance frequency of the chassis and an electric parameter of the absorbing material, performing an electromagnetic analysis by using a thermal analysis software such as FEKO; correcting the analysis result by sample testing; determining whether the chassis satisfies the design requirement, if it satisfies the requirement, the optimizing design will be finished, otherwise, modifying the preliminary computer assisted design model, the electromagnetic analysis parameter and the thermal analysis parameter, repeating the above processes until the requirement is satisfied.

Optimization design method for the chassis structure of an electronic device based on mechanical, electrical and thermal three-field coupling

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Xi'an, China

Baoyan Duan