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液压集成块设计过程建模理论、方法及应用研究
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摘要
液压集成块是集成式液压系统中的关键部件,由于其外部布局与内部油路连通设计的复杂性,已成为集成式液压系统设计中的瓶颈环节。本文结合国家自然基金项目,以实现液压集成块快速高效设计、提高液压集成块设计过程和结果的可适应性为目标,系统地研究了液压集成块的可适应设计过程建模、快速设计原型软件系统等关键技术问题,取得如下创造性研究成果:
     1.引入广义装配和广义装配平台的新概念,提出了一种基于广义装配理论的液压集成块可适应设计过程建模方法。该方法将设计知识、设计中间结果等设计过程信息融入广义装配平台中,克服了传统设计过程模型、KBE技术与CAD系统难以实现有效集成的不足,实现了液压集成块设计过程模型与KBE技术在CAD平台上的融合,从而保证了设计过程的可回溯性,设计结果的易于修改、变更和可重用性。
     2.提出了一种面向设计的液压阀模型和开放式液压阀库的构建方法。该方法针对传统标准件库所包含的设计信息不完整、关联性差等问题,通过在液压阀模型和数据库中完整记录液压集成块设计所需的信息,并利用三维CAD软件的关联技术等,使得液压阀库可有效地应用于液压集成块的设计。此外,该方法采用CBR技术和RBR技术实现液压阀库的开放性,保证液压阀模型的正确性和信息完整性。
     3.采用矩阵描述基本油路中的油孔参数信息,并根据工艺孔起始面矢量和工作油孔起始面矢量之间的运算关系定义动态特征的各种拓扑结构形式,建立了液压集成块基本油路的动态特征数学模型,并推导出动态特征矩阵中的参数求解算法。该数学模型快速地实现油路连通方式的拓扑动态可变、以及油路参数的编辑调整,从而在油路概念设计中迅速实现设计人员的设计意图
     4.提出了一种基于特征映射技术的液压集成块油路详细几何特征的自动创建方法;该方法可使得液压集成块设计过程中的重复性工作由系统自动完成,极大减轻了设计人员的劳动强度。采用一种基于实体模型布尔运算的油路连通关系验证和最小壁厚校核的方法,保证了设计结果的正确性。
     5.在SolidWorks平台上,采用Visual Basic 6.0开发工具开发出液压集成块快速设计原型软件系统。该软件系统界面友好、人机交互方便,适用于板式阀、叠加阀、二通插装阀和螺纹插装阀四类结构形式液压阀混用的液压集成块设计。
     上述研究成果丰富了集成式液压系统和液压集成块的设计理论,所开发的液压集成块快速设计原型软件系统已在企业获得成功应用,有效地提高了企业的液压集成块设计能力,显著地缩短了其设计周期。
Hydraulic manifold blocks (HMB) are the key components of the integrated hydraulic system. Whose design is the bottleneck for design of the integrated hydraulic system because of complexities of external layout of hydraulic valves and internal connection of oil routes. Some key technology problems are researched, including design process modeling of HMB which is adaptable, and the prototype software system for HMB rapid design, in order to realize rapid and efficient design of HMB, and improve adaptability for design processes and design results. The main contents and innovation are as following:
     1. The new concepts of generalized assembly and generalized assembly platform are given, and a design process modeling method of HMB which is adaptable based on generalized assembly is provided. With this method, the design process information, such as design knowledge and middle design results, is included in the generealized assembly platform. Then the design process model and KBE (knowledge-based engineering) technologies are combined in the CAD platform, and the problem that traditional design process model, KBE technologies and CAD system are difficult to be integrated is resolved. Finally, the design process can be traced, and design results can be easily revised, changed and reused.
     2. A construction method of hydraulic valve models and the open hydraulic valve library for HMB design is introduced. With this method, the information for HMB design is completely recorded in hydraulic valve solid model or database, and association technologies of 3D CAD software are used, so that the hydraulic valve library can be effectively used to HMB design, and some problems are solved because of incomplete information, poor association in traditional standard part library. In addition, the new models with the correct models and complete information can be easily added to the hydraulic valve library, because of adopted CBR (case-based reasoning) and RBR (rule-based reasoning) technologies.
     3. The mathematical model of dynamic feature of basic oil route of HMB is constructed. The parameters of oil holes in a basic oil route are saved in a dynamic feature matrix. The topological structures of dynamic features are defined according to the computing relations between vectors of technical hole starting planes and vectors of functional oil hole starting planes. Then solving algorithms for the unknown parameters in the matrix are deduced. The connection topology of oil routes can be easily changed, and the parameters of oil route can be edited in time through dynamic features, so that the design intentions of designer will be clearly expressed and quickly realized.
     4. The detailed geometric features of oil routes of HMB are automatically generated through feature mapping technologies from oil route dynamic features. In this process, all repeated tasks are finished by systems, and work intensity of designer is greatly lessened. Finally the connections of oil routes are validated, and minimum of walls of HMB is assured, through Boolean computing among solid models, so that exactness of design results is guaranteed.
     5. On the CAD platform of SolidWorks, with Visual Basic 6.0 as development tools, the prototype software for HMB rapid design has been developed. This prototype software is of friendly interface, which can easily realize human-computer interfacing, and can be used to design of HMB with footprint valves, stacked valves, cartridge valves and screw valves.
     The above research results make it richer of design theories of integrated hydraulic system and HMB. The software for HMB rapid design has been successfully used in the enterprises, which illustrates that the design ability for HMB of the enterprises can be effectively improved, and design period for HMB can be largely shortened after adopting this software.
引文
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