| Airborne helmets are one of the key equipment of the fighter plane,the key link to realize the human-computer interaction of the fighters,and the embodiment of the level of the information technology of the fighter.Among them,the optical display component in the airborne helmet is the key component,which not only makes the pilot observe the external environment clearly during the flight process,but also displays the information state of the fighter,such as the flight attitude information,radar navigation information,fire control information and target aiming of the fighter.In the process of airborne helmets’ production,optical display components should be produced separately,adjusted and tested as key components,and then assembled into the airborne helmets.If the display component has defects,it will directly affect the quality of the helmets,and even seriously threaten the flight safety.Based on this background,this paper designs a set of adjustment device for the display components of airborne helmets,which is used for the calibration and testing of the display components in the production process to ensure the quality of the components.Firstly,the paper discusses the theory and technology of the display module and its adjustment method,and clarifies the relevant technical links of the display components and the adjustment devices of the airborne helmets,then lays the foundation for the design of the adjustment device.Secondly,identify the function and performance of the calibration device by analyzing the requirements of the calibration device of the display module of the airborne helmet,including the three performance indexes:optical aiming cross coincidence,visual measurement and evaluation,and display character correctness inspection.Then,based on the above requirements,the adjustment device is designed and constructed.The optical cross is produced by the parallel optical tube,and the digital cross is generated by the special image signal generator.Through the accurate alignment of the two,the optical aiming cross of the display component is calibrated and adjusted;the visual adjustment of the display component is completed by using the standard optical tube and under the uniform illumination of the parallel light tube;the design scheme of fixing the display component to the five degree of freedom mobile platform is adopted to complete the full calibration.The display component can adjust movement in five degrees of freedom during foot adjustment.The paper demonstrates the design and selection of each hardware in detail,and calculates the key parameters;In addition,we design the corresponding hardware control system in order to make the adjustment device have a good integration and automation,and meet the production requirements,including five precision electronic control systems for freedom adjustment,special image signal generator,parallel light tube lighting power supply and so on.Moreover,we develop a set of special upper computer software by MFC.Finally,on the basis of the installation of the adjusting device,we carry out the comprehensive function test and performance parameter test,along with the error analysis of the test data.The practical application test of the adjustment of helmet display component has also been carried out many times.According to the application in actual production,the adjustment device which has high integration and automation can realize the functions of optical aiming cross coincidence calibration,visual measurement and evaluation,and display character correctness inspection of the helmet display component;the high precision five degree of freedom mobile platform of the calibration device can meet the requirements of production adjustment;Through upper computer software,it is more convenient to adjust the helmet display components.And with the adjustment device,the labor intensity of the production personnel is greatly reduced while the production efficiency is effectively improved,thus the product quality is guaranteed. |
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