Research On Optimization Of Assembly Scheme For The Hull Unit Of Amphibious Aircraft

Amphibious aircraft can take off and land on the water,it is mainly used for water rescue and forest fire fighting,and it is a very important equipment in the emergency rescue system.The hull parts of the lower part of the nose of amphibious aircraft have the characteristics of complex structure and strict requirement of watertight and anticorrosive performance.The prototype of X amphibious aircraft hull parts has problems,such as high assembly cost,long assembly cycle,and safety risk in overturning 180°operation.In this paper,the optimization of assembly technology scheme of the new configuration of X amphibious aircraft hull parts is taken as the main research purpose,and the following research works are carried out:(1)Analysis of hull parts characteristics and assembly scheme of amphibious aircraft prototype.Firstly,the characteristics of material selection,water tightness and structure of hull parts were analyzed in detail.Then,the problems such as high assembly cost,long assembly cycle and risk of turning 180° were analyzed,which laid a foundation for the optimization of assembly scheme of new hull parts and shortening assembly cycle.(2)Research on assembly unit optimization of new configuration of hull components based on multi-objective.Firstly,the objective function and constraint conditions of assembly unit quantity multi-objective optimization were constructed according to the structural characteristics of hull parts,the annual production demand of aircraft and the historical data of assembly production.The Pareto front and non-inferior solution set of multi-objective function were solved by multi-objective particle swarm optimization algorithm,and assembly units were divided according to the formal assembly mode of hull parts.Then,according to the division of assembly units,the assembly scheme implementation of the new configuration of hull components is carried out,including the study of assembly coordination scheme and the assembly method of each assembly unit.Finally,the number of tooling and the plant area occupied by tooling are reduced,and the assembly cost of hull parts is reduced.(3)Research on assembly cycle shortening of new configuration of hull components based on six Sigma management.According to the analysis of assembly units divided into new configurations of hull parts,the assembly cycle can not meet the requirements of delivery rate.In addition,the adoption of formal assembly will further prolong the assembly cycle.In order to meet the requirements of customer delivery rate,this paper further adopts the six Sigma management DMAIC process to shorten the assembly cycle of hull parts under the premise of not significantly increasing the cost,taking the assembly of hull parts as the main body.Firstly,the assembly process of the panel is sorted out and the improvement target is determined.Then analyze the factors leading to the long cycle of each process and determine the main factors.Finally,corresponding improvement strategies were formulated to ensure long-term improvement,and the improvement measures were incorporated into the batch assembly production of new hull parts to meet the delivery rate requirements.