Research On Dynamic Simulation Of Aerospace Computer Structure And Design Of Environment Adaptability

A space computer is an embedded computer which is installed in various missiles, satellites, rockets, spacecrafts and space detectors. It has features of small volume, compact structure, high density of functionality and fine adaptability to environment. As a central intelligence for various spacecrafts and weapon equipment systems, it undertakes a multitude of tasks of data processing and transaction management. The space computer and its environmental adaptability technology have always been the key focus of developed countries' R&D effort. With the development of new-type aerospace projects and weapon equipments which include the second generation of navigation, space-based information network, the next generation of precise terminal guidance missiles, the next generation of launch vehicles, the next generation of strategic missiles, a higher request to the environmental adaptability of space computers has been put forward.Based on previous relative research works, this paper makes an in-depth and systematical research into design ideas, design methods and solutions of mechanical adaptability of space computers and corresponding structural reliability design. Combining of specific requirements of design of mechanical adaptability of space computers, general methods of dynamics simulation modeling, first order frequency simulation precision of PCB components, estimation of fatigue life of structural system under random vibration condition and two interior vibration damping methods are studied and relative experimental validations are carried out.According to theoretical research and practical needs, this doctoral dissertation centers on the design of mechanical adaptability of space computers and dynamic reliability problems and focuses on providing design methods and solutions on the pressing needs in the design problems of projects. The design of the mechanical adaptability is the main line of this dissertation which focuses on practical demand at the same time.This study includes the following contents:1. Discuss design methods for mechanical adaptability of space computers from three layers of whole machines, PCB assemblies and devices, of which whole machines focus on shock absorber application technology, PCB components focus on frequency optimization design and devices focus on dynamic response analysis and structural reliability calculation. 2. Investigate the modeling method and simplification principle in dynamic simulation analysis of space computers, research error causes between simulation results and physical experiments and determine the influence degree of error factors.3. Concerning design problem of mechanical adaptability of whole machines, Study the interval eigenvalue of multi-freedom vibration with uncertain parameters, derive approximate and quick calculation methods of dynamic response under PSD stimulation as well as eigenvalue based on Rayleigh quotient method and apply the calculation methods on the susceptibility analysis of the structure parameters of PCB assemblies.4. Concerning design problem of mechanical adaptability of PCB assemblies, highlight design method on optimization of PCB assemblies with interval parameters and frequency constraint, establish an optimized model with frequency constraint based on response surface method and bring forward the existing criterion on feasible solutions.5. Concerning design problem of mechanical adaptability of devices, concentrate on the problem of dynamic reliability of pins and solder joints of devices under stochastic vibration stimulation and put forward calculating methods of the structural life and degree of reliability of space computers in mechanical environment course.6. Concerning specific application needs of projects, study new design methods of interior vibration damping and test to verify their effectiveness.