| As the key component of integrated hydraulic system,hydraulic manifold block(HMB) is widely used.With the more and more complicated hydraulic systems,the design of HMB becomes more and more difficult.Therefore,introducing new methods and technologies into the field of HMB design becomes a trend in the future.Recently,researchers from home and abroad focus on applying different kinds of intelligent optimization methods to fulfill completely automatic HMB design.However,designers can't intervene or control the design process in this automatic method.So it often results in long design period and sometimes the design results need modification to meet the actual engineering requirements.In addition,the HMB design environments are usually 2D or simple 3D nowadays.In these environments, designers can only browse the HMB from outside and can't step into it to observe the inner holes intersection clearly,to locate the exact inference position,or to find out the possible movable space.These environments are relatively poor at interaction and visualization.Also, these half-close design environments restrict designers' creative ideation.HMB design is a process of interaction between human's creativity and environments and is a kind of intelligent action.Current HMB design does not offer convenient tools to permit designers join the design process.The HMB design is still a difficult,non-intuitionistic,and time-consuming process.In this dissertation,facing complex layout problems and aiming at effective HMB design, a new human-computer cooperative intelligent virtual design method(HCCIVD) is proposed based on thorough study on virtual design technology,computational intelligent algorithms, human-computer cooperation and artificial intelligence.Moreover,the implement strategy of the method is discussed and an open intelligent virtual design pattern and environment is developed.In this system,the whole design process of HMB can be fulfilled with high efficiency.The main research contents and results are as follows:On the basis of summarizing the features and design process of HMB,it is put forward that the core of HMB design is a problem of optimization of outer spatial layout scheme and inner holes connection scheme.It can be boiled down to a complex 3D spatial layout problem. Through analysis on different kinds of currently hot research strategies in layout problems,a HCCIVD method combining virtual design technology,computational intelligent algorithms, human-computer cooperation and artificial intelligence technology is proposed.Taking the virtual design environment as shell,the intelligent algorithm as core,the artificial intelligence as guidance,the engineering database as support,the method take full advantage of human's high-level decision-making ability and computer's rapid response and calculation power to realize the perfect harmonious unification of intelligence among designers,experts and computers.The method's feasibility,syncretizing mechanism,design process and implement key technologies are discussed in detail and the frame structure is given.HCCIVD method offers not only a brand new approach to HMB design problem,but also a reference to complex special layout problems.Virtual design environment is the platform of HCCIVD method while virtual modeling is the basis and key in building a virtual design system.For HMB design problem,a new intelligent multi-resolution featured parameterized virtual modeling method is brought forward.Taking featured parameterized modeling as kernel,using boundary representation 3D solid model,introducing agent-based intelligent behavior modeling,encapsulating leveled design lifecycle features,a virtual modeling method suitable for HMB design is developed.The creating of virtual design scene is the basis of a virtual design system while natural intuitionistic human-computer interaction manner is one of the features of a virtual design system.Based on the modeling method discussed above,a virtual design pattern and environment composing scheme is provided.Real-time dynamic display of 3D virtual design scene as well as bump detection and virtual walk are accomplished in this leveled open HMB virtual design environment.In this immersive HMB environment,designers can interact with the design objects in a natural way.Therefore,the design scene can not only display the design results,but also become an organic component in the HMB design process.An optimization mathematical model for HMB design is established.Then,the supporting relations and implementation of six design modules in optimization of HMB are discussed.After introduction of three design modes,automatic design based on niche genetic annealing algorithm(NGSA),virtual design based on human's intelligence and intelligent design based on function blocks,a HMB human-computer cooperative intelligent optimization method in virtual environment is given.In HMB virtual design environment, using the databases as the bottom foundation,centering on human-computer cooperative NGSA,guiding with layout and connection agents,taking advantage of former design results and experts' knowledge and experience with virtual layered function blocks,this method realizes the combination of three design patterns(automatic,semiautomatic and manual) and three kinds of intelligences(computer intelligence,experts intelligence and designers intelligence).The method is an operative multi-level integration of human and computer's intelligence.A HMB design example verifies the validity of the method. Based on the researches mentioned above,an intelligent virtual design software package is developed using Visual C++ and OpenGL toolkit.The system frame structure design,data structure design,interface design and database design are discussed in detail.In the end,a typical integrated hydraulic system is designed by using this software and the satisfying results have testified the practicability of this software as well as the feasibility and effectiveness of the method proposed in this dissertation.
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