Airworthiness Analysis And Numerical Simulation And Structural Optimization Of Stratospheric Airship

As a new kind of adjacent spacecraft,stratospheric airship has the advantages of long standing in space,wide detection range and strong ability of stealth,which has good application prospect in civil field With the development of stratospheric airship,the airship accidents caused by safety factors can not be neglected.The research of related airworthiness technology of the stratospheric airship is significant and has important application value.Firstly,in this paper,the airworthiness of the airship have been reviewed and the development and current situation of the airworthiness requirements of the airship are analyzed at domestic and internat ional.This paper analyzes the relevant requirements of performance,structure and power requirements of airworthiness requirements in FAA airship type certification advice,obtains constrains which is derived from airworthiness requirements of the airship capsule structural analysis.Secondly,the structural characteristics of the stratospheric airship's capsule and the non-linear numerical analysis method applicable to the airship structural have been analyzed.This paper establishes the numerical values of the capsule structure under the different working conditions which conclude the capsule structure model of homogeneous bladder compr ession loading,the capsule structure model of uniform loading capsule,the structure model of non-uniform capsule pressure capsule.And then analyzing the force situation of capsule structure in different condition,verifying the feasibility of the structure analysis method,and providing the analytical method for airworthiness verification of the airship capsule.Finally,a mult i-objective optim ization of stratosphere airship is proposed by combining mult i-objective optim ization and mult i-attribute decision making.NSGA-II method is used for mult i-objective optimization.The multi-attribute decision matrix is constructed based on the Pareto optimal solut ions set solved from multi-objective method NSGA-II.The modified technique for order preference by similar ity to ideal solut ion(M-TOPSIS)is employed to rank the Pareto optimal solutions and identify the best Pareto solution.The study demonstrates that the application of the NSGA-II method and M-TOPSIS decision method are effective in stratosphere design optimization.