Study On Impulse Resistant Performance Of Shipboard Photoelectric Tracking Equipment

Shipboard photoelectric tracking equipment is a integrated photoelectric system which combined many technologies such as precision optics, signal processing, image processing, control technology and other technology.The equipment is mainly used to acquisition,track and point target. Shipboard photoelectric tracking equipment plays an important role in shipboard optoelectronic countermeasure, carrier-based aircraft landing guidance, at-sea accurate measurement and so on.The environmental conditions that shipboard photoelectric tracking equipment face are very complex.Ship itself and the equipment may suffer from continuous impact load caused by wave, artillery, etc.Impact load could make large stress and deformation on the equipment,which decreases the use of performance and service life of equipment.So the research of the equipment’s impact resistance is of great significance.First of all,this paper introduced the overall structure of the shipboard photoelectric tracking equipment. According to the structure characteristics of shipboard photoelectric tracking equipment,the 3D modeling and finite element modeling technology were analyzed,mainly including geometric model simplification and the grid division.Based on the theory of modal analysis, the vibration modal analysis of the shipboard photoelectric tracking equipment was carried out,from which the natural frequencies and mode shapes were obtained.Secondly,because the original model of the shipboard photoelectric tracking equipment bracket was unreasonable,so the bracket was optimized using ANSYS Workbench Design Exploration module.The parametric design model was established by Pro/Engineer.The mass, first-order natural frequency and the maximum deformation were chosen as the objective functions.Through sensitivity and response surface analysis,the parameters that had larger influence on the three objective functions were selected as final design variables.Based on multi-objective driven optimization,the first optimization was carried out.Optimization result showed that the maximum deformation was oversize,so the stiffener was added in order to reduce the deformation and the stiffener was optimized in the same way.Then,briefly analyzed the theory of Dynamic Design Analysis Method(DDAM) and the determination method of design shock spectrum.Based on the modal frequency and modal mass,the shock resistance analysis of the shipboard photoelectric tracking equipment was carried out using DDAM.Finally, design shock spectrum of the time domain method and the method of converting spectrum to the time domain were introduced.The shock resistance analysis was carried out by time domain simulation method. A variety of conditions were set to analyze the regularity of dynamic response characteristic. The relationship between impact acceleration peak, impact acceleration pulse width and dynamic response was established.