Structural/Parametric Identification of Thermal Control Coating Degradation Process Based on Research of Their Optical Properties in Spacecraft Environmental Conditions: Method and Results

An experimental-and-analytical thermal control coatings (TCC) degradation process research methods based on flight test data has been discussed. The application of this method allows to set up a diagnostic experiment using spacecraft (SC) on-board systems, to identify radiation parameter values based on indirect information on transient temperature changes of the TCC test specimens, and to perform a long-term prediction of the TCC's integrated absorptance variations. An alternative approach to implement the strategies for increasing accuracy and information capacity of the test dates based of the inverse non-linear problem solution concept has proposed. Computation techniques and algorithms based on multidimensional random search and iterative reqularization methods have presented. Research results and their error estimation, as well as data on the applicability of various types of TCC (enamels, silicates, optical solar reflectors) for transient temperature changes of the TCC test specimens, and to perform a long-term prediction of the TCC's integrated absorptance variations. An alternative approach to implement the strategies for increasing accuracy and information capacity of the test dates based of the inverse non-linear problem solution concept has proposed. Computation techniques and algorithms based on multidimensional random search and iterative reqularization methods have presented. Research results and their error estimation, as well as data on the applicability of various types of TCC (enamels, silicates, optical solar reflectors) for SC's positioned on a 600-900 km high near-polar orbit for 1 to 20 year lifetime have been given.