As virtual simulation has the characteristics of low cost, short cycle and high quality, it has been one of the main means for design, measurement and evaluation of infrared imaging guided weapon system in complex environment. Aimed at an armed helicopter and based on physical model of aero engine , the paper begins with the overall geometry modeling for helicopter, and calculates the fluid field and temperature distribution of skin,nozzle and plume. By converting the infrared radiance to gray value, the radiation luminance images in close depth and different directions can be generated, and the database is founded. Finally,the image in view point is built after database transfer and atmospheric attenuation with the current distance. The simulation result shows that the method proposed here can generate the armed helicopter's infrared images with high fidelity and excellent real- time property,and it has higher military value in infrared imaging guided missiles simulation and night aviation training simulation systems for armed helicopter.%虚拟仿真以其低成本、短周期、高质量的特点,逐渐成为复杂环境下红外成像制导武器设计分析、验证和评估的主要手段之一.以某武装直升机目标为对象,首先利用基于航空发动机物理模型的方法,通过全尺寸几何建模、计算蒙皮、尾喷和羽烟等主要红外辐射源的流场和温度场,利用灰度等级描述红外辐射信息,生成不同视向角下的近场红外辐射亮度显示,并存储形成数据库.然后根据具体使用时的条件从数据库中调用,按照距离进行大气衰减,最终形成视点处的红外辐射亮度显示.实验结果证明,算法生成的武装直升机红外图像真实感强,实时性好,可用于红外成像制导导弹仿真和夜航模拟训练系统的红外视景显示,具有一定的军事参考价值.
展开▼
