Mirror Space Antenna Reflector Made of Composite Materials Constructive Appearance Determination

High requirements are imposed on the mass and dimensional stability of reflectors of onboard mirror space antennas in promising communication satellites. To meet these requirements, new design and layout schemes for reflectors using composite materials are being developed. The use of flat reinforced carbon fabric composites in these designs is of particular interest. A technique is developed for the experimental determination of mechanical and thermophysical characteristics of the carbon fiber used in a thin-walled shell (0.6 mm) of the onboard space antenna reflector. Data are obtained on the elastic modulus of the carbon fiber based on Aspro-A80 carbon fabric and Huntsman Araldite LY8615 US/XB 5173 Hardener epoxy compound in two directions. The thermal conductivity of the material in the plane of reinforcement is determined.

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An Experimental Study to Determine Mechanical and Thermophysical Characteristics of Thin-Walled Carbon Plastic Antenna Reflectors

Novikov

Резник

Denisov

2020

PoHEI.MB

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The Selection of the Reinforcement Scheme for a Parabolic Antenna Made of Composite Materials with an Elliptical Aperture Line

Galinovsky

Denisov²,

Gavrilova³

et al. 2020

PoHEI.MB

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Being prepared foThe problems of designing and calculating reinforced shells of revolution made of composite materials as constituent elements of parabolic antennas with an elliptical aperture line having a focal parameter value of not more than 0.03 m are examined in this paper. The structural layout schemes of reflectors of the parabolic-type mirror spacecraft antennas are reviewed. A technique for designing a bearing frame for reinforcing the reflector shell using numerical analysis based on the finite element method is presented. The technique is based on the assessment of the stiffness parameters of the structural elements of the reflector located between the annular ribs. It utilizes optimization in order to achieve a constant gradient of changes in the stiffness parameters. The deformability of the reflector design that uses a modern high-modulus composite material is evaluated. A finished product is presented as the result of the application of the technique. An assessment of manufacturing and design errors is performed based on the experimental data. The proposed approach to the design of reflectors with an elliptical aperture line eliminates warping of the molded product and deformation during operation such as twisting in the form of a propeller. The results of the study can be used for designing reflectors of spacecraft mirror antennas with a narrow radiation pattern that meet strict requirements of the accuracy of the reflecting surface geometry as well as mass restrictions.

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Method of achievement the high accuracy of the shape of reflectors of mirror antennas of spacecraft

Taygin

Лопатин

2019

S&T

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Analysis of conditions, which are required for mirror antennas of spacecrafts destined for transmission of high-frequent radio signals, is done in this paper. These conditions are regarded to resistance and rigidity of the construction features of the material of an antenna’s reflector and its surface’s quality. It is mentioned that the requirements to the accuracy of the reflector’s shape grow together with the frequency of a radio signal. Altogether, the existing constructions of antennas and the producing technologies are not capable to obtain those requirements. The innovative method of controlling the shape of a reflector of a mirror antenna is presented in the paper. Its application gives an opportunity to produce constructions with a highly accurate surface. This method deals with the fact that the required accuracy of a reflector can be achieved via elastic deformation of its shell. Design of the regulating units for different types of reflectors is developed. We propose an algorithm of choosing the number of the regulating units and their locations. This algorithm uses the results of finite-element modal analysis of a reflector’s shell. Innovative design of axisymmetric and offset reflectors which shell’s shape can arise from controlled deformation is developed. We also suggest the design of the reflector’s shell with a timber with regulating units on it. Such design provides an opportunity to significantly decrease the number of the regulating units. Project of the reflector with a timber and console rods possessing low mass and high stiffness is developed. Method of achievement the high accuracy of a reflector, presented in the paper, can be applied to design of new space antennas operating in high-frequency interval.

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Mirror Space Antenna Reflector Made of Composite Materials Constructive Appearance Determination

Cited by 3 publications

References 4 publications

An Experimental Study to Determine Mechanical and Thermophysical Characteristics of Thin-Walled Carbon Plastic Antenna Reflectors

An Experimental Study to Determine Mechanical and Thermophysical Characteristics of Thin-Walled Carbon Plastic Antenna Reflectors

The Selection of the Reinforcement Scheme for a Parabolic Antenna Made of Composite Materials with an Elliptical Aperture Line

Method of achievement the high accuracy of the shape of reflectors of mirror antennas of spacecraft

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