- Research Highlight
- Open Access
Coupling Modeling for Functional Surface of Electronic Equipment
© The Author(s) 2017
- Published: 11 April 2017
- Functional Surface
- Electronic Equipment
- Electromechanical Coupling
- Electrical Performance
- Mutual Coupling
High performance electromechanical equipment is widely used in various fields, such as national defense, industry and so on . In addition, the technical level of high performance electromechanical equipment is the embodiment of the national level of science and technology. There are two types of complex electromechanical equipment. One of them belongs to traditional machinery, in which the electronic information technology is used to enhance the mechanical performance by making the system more sophisticated, more efficient and more intelligent, such as numerical control machine. The other belongs to electronic equipment, in which the mechanics is used to enhance its electrical performance, such as microwave antenna, radome and so on.
At present, the electronic equipment as the representation of the second type of electromechanical equipment is utilized in various areas on land, in the sea, in the air and in outer space. There is a class of geometrical shape called functional surface in electronic equipment. It is a complex surface that realizes the specific physical properties. Different from the surface of traditional electromechanical equipment, such as turbine blades, aircraft shape, etc., functional surface is designed to achieve electricity, magnetic, light, heat and other functional characteristics of non-traditional mechanical disciplines.
After years of research, key laboratory of electronic equipment structure design of ministry of education has achieved some outstanding achievements on electromechanical coupling issue of functional surfaces, some of which have been applied in practical engineering. In the following, the electromechanical coupling issues and the correspond models for reflector antennas, active phased array antennas and radomes are introduced respectively.
Reflector antennas are widely used in radar, communication, remote sensing, radio astronomy and other fields. However, with the development of modern reflector antennas towards large aperture and high frequency, it is more difficult to ensure their surface accuracy. Therefore, lots of work has been done to ensure their electrical performances from the coupling relationship between structural error and electrical performance . But how to ensure the electrical performance of the antenna from the aspect of electromechanical coupling is the content that we want to present in the following.
The main factors related to the electrical properties of reflector antennas are panel deformation, feed position and attitude, etc. In practice, external loads such as gravity, wind and temperature will lead to the reflector panel’s deformation, feed position offset and attitude deflection, which affect the electrical performance.
The electromechanical coupling model has been applied to a 66 m antenna structural design, which achieves the optimal stiffness distribution of the back-up structure and the center body, improves the structural symmetry and reduces the system failure risk. Ultimately, the gain of antenna increases by 0.4 dB, the sidelobe level decreases by 1.2 dB, and the weight decreases by 8%.
The radome is a cover made of natural or manmade dielectric material, or a special shaped electromagnetic window made of a truss-supported dielectric housing. It provides a suitable interface for maintaining the structure, temperature and aerodynamic characteristics . In the manufacturing process, complex molding is needed to obtain a specific shape. This results in inconsistent material parameters of the shell and affect the electrical properties.
Equation (3) can be applied to analyze the effect of material properties errors of streamlined airborne radome on the electrical performance. Besides, the thickness profile of the radome can be designed with optimization models , which has reference value for practical engineering.
With the development of electronic equipment toward high accuracy, high density, high frequency and atrocious service environment, the electromechanical coupling issues of functional surface will be more prominent, such as the passive intermodulation and the heat transfer problem, etc. Therefore, it is necessary to study the electromechanical coupling issues of electronic equipment in depth.
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