2 results about "Electromagnetic simulation" patented technology

The invention discloses a method for electromagnetic simulation of different error maps with a ray tracing algorithm, which mainly solves the problem of the undefined influence degree of different types of map error factors in geometric environmental information on an existing ray tracing model predicting result. The method is implemented by the following steps: (1) obtaining a required digital map corresponding to the outdoor micro-area environment; (2) respectively generating a plurality of building top offset error maps and wall translation error maps on the basis of the obtained map; (3) performing radio wave propagation simulation prediction on the original digital map and the error maps by adopting a ray tracing model, so as to obtain a mean value and a root-mean-square value of path losses of the top offset error maps and the wall translation error maps as well as the original digital map at each test point. According to the method, the influence degree of the different types of error factors in the geometric information on the precision of the ray tracing predicting result can be analyzed through the mean value and the root-mean-square value which are obtained through simulation, and reference is provided for radio wave propagation and channel prediction in an outdoor micro-area scene.

The invention belongs to the field of aircraft engine design, and relates to a design method for comprehensive suppression of infrared and electromagnetic signal features of an aero-engine. The method comprises the following steps: acquiring an infrared signal radiation intensity target value and an electromagnetic signal RCS target value; determining the average temperature T1, meeting the infrared signal radiation intensity target value, of the visible area of the rear cavity of the engine; determining the cooling flow W1 of the visible part of the rear cavity of the engine according to the average temperature T1; determining an engine cooling channel structure and an opening cooling form which meet the temperature reduction requirement; by electromagnetic simulation calculation, determining angle combinations of multiple groups of typical parts of the engine meeting the requirement that the electromagnetic signals are not higher than the RCS target value of the electromagnetic signals; and by iterative optimization, determining the angle combination of the typical parts of the engine with the minimum electromagnetic signal under the condition of engine thrust. According to the invention, the problem of comprehensive suppression of the infrared and electromagnetic signal characteristics of the engine is solved, so that the infrared signals of the engine are lower and the electromagnetic signal characteristics are smaller.