Research On The Theory And Key Technologies Of Hydraulic Manifold Blocks Intelligent Verification System

Hydraulic manifold block(HMB) is widely applied in hydraulic systems.It offers many advantages including compact structure,convenient installation and maintenance,less leakage and small vibration.It is also suitable for building typical integrated and standardized hydraulic systems.The key problem of HMB design is how to obtain an optimal integration outer spatial layout and inner connection scheme.However,due to the complexity of HMB, most works are devoted to the global searching of optimal layout and connection schemes. Works on the engineering verification of design results are still at the preliminary stage and have limits.In addition,thorough research on theory and key technologies in this field are needed.Verification is necessary to systematically check out the design results' practical function,performance and quality in order that they can meet not only the needs of machining and manufacturing,but also the actual demands of valves layout and dynamic characteristic in pipeline networks.The paper is supported by the National Natural Science Foundation of China.Combining with the practical engineering and taking the complete verification of HMB design results as the goal,further research on the theory and key technology of HMB verification has been made.A HMB intelligent verification system(HIVS) is developed.The system can verify and evaluate the design results.It also realizes the integrated process from design to application.The complexity of HMB design and various requirements of integrated hydraulic system in actual production are summarized.It is pointed out that the verification of geometric structure and performance constraints of HMB design results is one of the key links during the design process and needs to be well solved.The concept of generalized verification is introduced to solve the multi-semantics of constraint conditions in the optimum design process and the limitations of mathematical abstract on the product design knowledge. Generalized verification involves all the constraints during the whole life circle of product design.Based upon it,related theories and key technologies are researched deeply and HIVS is to be developed.According to the function requirements of HIVS,general planning is carried out based on functional driven system planning principle.The architecture and work flow of the system are determined.It clearly puts forward that the system should possess the functions of virtual reality design,performance verification of pipeline networks,virtual assembly design and results output and management.All parts are linked and harmonized by using reasonable and scientific methods.On this basis,the subsystems functions are designed in detail.The principal questions and key techniques are discussed,so that a foundation has been set up for the realization of the system.The following works aim at describing the dynamic characteristic of inner pipeline networks accurately.After expatiating on the verification target,the advantage and characteristics of Power Bond Graph(PBG) method and Computational Fluid Dynamic method(CFD) are discussed.CFD method can give accurate numerical depiction of the local typical structures in which the flows are always in turbulent state from the flow mechanism. This paper proposes the implementation strategy of combining PBG method with CFD method to study the modeling and simulation of HMB pipeline networks.An automatic modular modeling technology is used to automatically analyze the structure of pipeline networks,establish and solve the mathematical model.Accordingly,the dynamic response curves and related performance index can be attained.The research proves that this coupling method can obtain and analyze the dynamic performance of pipeline networks with fairly accuracy.The paper also explores the influence of typical structure improvements on the pipeline networks' dynamic characteristic.In this way,the complete design process is accomplished by blending together the HMB structure design and the flow field performance simulation of pipeline networks.On the basis of deep study on the engineering design experience and criteria of HMB,a technical route using virtual assembly to fulfill structure verification is established.An object-oriented feature based modeling method is used to provide complete model information for virtual assembly simulation.Moveover,an interactive assembly sequence planning method is presented based on disassembly method.Through the analysis of assembly path planning methods,spatial planning integrated with A~* search algorithm is used on HMB.The simulation of HMB assembly is realized by using the technology of axis driving under spatial constraint in virtual environment.At the same time,some analysis works such as collision and interference checking are carried during the course of assembly.Using the theory and method mentioned above,the geometric structures verification of HMB design results can be carried out accurately.Also,assembly process planning results which can meet engineering requirements can be attained.Based on analysis of the information flow in HMB design and verification,a rational information structure is devised.An information flow model of whole life circle is also established.To satisfy the demands of design information in the process of HMB design and production,the results should be expressed completely.This paper displays the optimization design results by combining the data information with engineering drawings.The data information includes components data and project data.The engineering drawings include 3D engineering drawings and 2D engineering drawings.All the information is coordinated and organized scientifically.In the paper,the engineering drawings implementation method is introduced briefly.Above research can show the HMB design results omnidirectionally and offer data support for the automatic HMB optimizing design as well as intelligent verification.Based on the design idea and methods mentioned above,a prototype software HIVS is developed using MDT as a platform,Visual C++6.0 as compile tool and ObjectARX as a development tool.The system can verify the HMB design results automatically and successfully.It includes virtual assembly subsystem,pipeline networks performance verification subsystem and design results information output subsystem.In the end,a typical integrated HMB design result is verified by the system to show the whole work flow and detailed functions.The satisfying results have testified the practicability and validity of this system.