Design Of The Aircraft Virtual Human Of Distributed Virtual Maintenance System

In aircraft of virtually maintenance training,maintenance personnel simulate the real maintenance operation by controlling the aircraft maintenance virtual human to achieve the purpose of aircraft maintenance training,and improve their maintenance skills and theoretical level.But in the virtual maintenance process how naturally and realistically to simulate the operation behavior of maintenance personnel has always been a difficult problem in aircraft virtually maintenance simulation.Therefore,this paper studies the behavioral driving and generation of virtual humans in the maintenance operation process with the self-developed distributed virtual maintenance system as the platform.On the basis of analyzing the characteristics of a dynamic cycle of aircraft maintenance and the similarity and concurrency of maintenance personnel's behavior,a hybrid driving method of aircraft maintenance virtual human's behavior based on inverse kinematics and key frame interpolation is proposed.The maintenance activity space is divided to realize the expression and behavior control of the three-dimensional model of the aircraft maintenance virtual human on the platform.The specific contents are as follows:Firstly,the interaction and inclusion relationship between maintenance personnel,maintenance objects,maintenance tools and maintenance environment during maintenance operation are analyzed.The dynamic,orderly and cyclical characteristics of aircraft maintenance and the similar and concurrent characteristics of virtual human behavior are summarized.On this basis,the operation process of maintenance objects is decomposed into the maintenance operation preparation stage,the maintenance object implementation stage,and the maintenance operation end stage.Virtual human behavior layering method based on maintenance process decomposition is proposed,which divides virtual human behavior into maintenance behavior,upper limb behavior and transition behavior.Then,maintenance behavior,upper limb behavior and transitional behavior of virtual human are studied respectively.A virtual human maintenance behavior model based on parametric key frame interpolation is established to drive the hand joint kinematics chain to change the initial state to the target state.The hierarchical model of a virtual human upper limb motion chain is established according to the principle of minimum rotation of joints,and the solution idea of redundant degree of freedom of the elbow is given.A demonstration example is designed to verify the feasibility of the solution method.The transition behavior and operational logic of the virtual human are analyzed,and the virtual human transition behavior model based on the spatial division of maintenance activities is established to realize the automatic and orderly generation of the behavior of each layer of the virtual human.Finally,the hybrid driving method is validated in the distributed virtual maintenance training system,and the three-dimensional model of the aircraft maintenance virtual human is established by combining the surface model and the hierarchical model,which is imported into the virtual environment to realize the simulation of single virtual human completing the maintenance operation and multi-virtual human completing the maintenance operation in collaboration.The results show that the driving hybrid method of virtual human behavior can accurately control the virtual human to complete the virtual maintenance operation,and realize the real-time interaction between virtual human and virtual human,virtual human and maintenance object.