THE LAYOUT OF ON-BOARD ELECTRONIC SYSTEMS WITHOUT RESONANT BLOCKS USING DOUBLE-LAYER PRINTED CIRCUIT BOARDS WITH A RIGID BASE

Abstract

Background. The aim of the work is to develop an engineering methodology for calculating printed circuit board assemblies with a rigid substrate. The analysis of methods and techniques for calculating resonance-free (in the operating frequency range) electronic units of on-board radio-electronic equipment (OREEq) and, in general, the design of resonance-free electronic units is carried out. The modeling of natural oscillation frequencies for various methods of fixing printed circuit board assemblies is carried out. Matherials and methods. The mathematical principles of the theory of mechanical oscillations are applied to obtain analytical expressions for the natural oscillation frequency of structures. The ANSYS software package was used for test comparison of the obtained results. Results. The modeling of natural oscillation frequencies for various methods of fixing printed circuit board assemblies is carried out. Numerical solutions are obtained for various variants of multilayer printed circuit boards differing in thickness and substrate materials. The accuracy of calculations of the natural oscillation frequency is assessed. A method for creating resonance-free electronic units of OREEq is proposed and recommendations are given for creating technological resonance-free designs of OREEq units based on the use of modern substrate materials for printed circuit boards. Conclusions. The results of the work in the form of recommendations for increasing the rigidity of the cylindrical structures of onboard electronic equipment will allow creating more reliable structures due to improved vibration resistance. Prompt, well-founded selection of printed circuit board mounting schemes at early design stages will reduce the work time.

Keywords

• printed circuit assemblies
• mathematical modeling
• natural frequencies
• electronic units
• resonance