Research On Radiation Imaging Simulation System Of Solid Rocket Motor

Film radiographic inspection is one of the most widely used methods for logistics inspection and maintenance of solid rocket motor.In the process of developing and optimizing the solid rocket motor radiation detection process,the process parameters such as radiation dose,transillumination angle and focal length need to be tested and tried a lot of experimental analysis.The whole process is costly and takes a long time.Especially in the detection of new products,the lack of prior knowledge will make these problems even more serious.And the research on the ray defect of the solid rocket motor is also based on the expensive actual transillumination experiment,which consumes a lot of manpower and financial resources,and also delays the progress of the research work.At present,advanced computer simulation technology can solve these problems,so this paper studies the radiation imaging simulation system for solid rocket motors.In this paper,the mathematical model of X-ray imaging simulation is established from the actual solid rocket motor radiography detection system.The continuous energy spectrum characteristics and the non-point source focus design are integrated into the simulation of the radiation source;The corresponding relationship between material attenuation coefficient and ray energy is established for the multi-material model of solid rocket motor;The imaging mechanism of the radiographic film was characterized using blackness characteristics.Then the ray imaging simulation algorithm based on STL model for non-point source and multi-energy spectrum projection is studied.The algorithm can achieve the imaging accuracy requirements of the actual film,the simulated image blackness and the actual film blackness curve trend and numerical range are consistent under the 10 GY dose condition,especially the maximum difference in blackness of the most concerned thermal insulation layer is only 0.23.In order to solve the problem of low efficiency of intersection between ray and STL model in imaging algorithm,this paper uses the method based on three-dimensional space projection constraint to improve the intersection efficiency by about 10 times.In addition,the GPU parallel technology is used to optimize the algorithm.The optimized algorithm can achieve an acceleration ratio of about 500-1000 times on different performance GPU devices while maintaining the imaging accuracy.Finally,the simulation software system was designed and developed to provide a good simulation experiment platform for the development and optimization of the actual solid rocket motor radiation detection process.