Algorithm And Implementation Of Assembly Precision Adjusting System For Devices On Satellite

The precise position adjustment of devices on a satellite is considered as the most important step in an assembling progress of a satellite. Traditionally, position adjustment depends on experiments of engineers, and it's time-consuming and difficult. A position adjustment algorithm and a simulation of adjustment progress based on the algorithm are proposed as an approach to solve this problem, and a trial operation of the newly developed system indicates the effectiveness of our approach.Based on an analysis of a simulation system of the precision position adjustment, the function tree of the system and tree-tier architecture are built, and the work flow of the system is also design, so that the paper achieves a design of the system scheme.Most attention is paid to mathematics modeling for assembling precision adjustment of devices on a satellite in the paper. Based on a suggestion that all of the devices on a satellite are rigidity, a mathematics modeling for the precision adjustment and simulation of devices is proposed. The model can be used to calculate an angle between the ideal position plane and the actual position plane of a device with the azimuth angle and the pitching angle of the position plane normal of a device, and the azimuth and pitching angle can be measured by a theodolite. Then the values of shims of position supports and the placed position of position plane of a device can be calculated.The simulation of an adjustment progress is import for an adjustment system. This paper combines JAVA 3D and Virtual Reality Modeling Language (VRML) to achieve an adjustment scene, and uses Transfon3D class, Alpha class and Interpolator class to achieve dynamic movement of model nodes, so that the dynamic position adjustment progress of a device can be simulated.The system includes model management, precise adjustment calculation, adjustment simulation and adjustment report build. All of the models are tested with data from a satellite of China Academy of Space Technology; the trial operation of the system indicates the effectiveness and practicability of our approaches.