Papers by Author: Li Gang Qu

Abstract: The technologically system architecture of aircraft assembling process visualization is presented according to the development requirement of digital aircraft assembly. The key technologies is studied about the dynamic data associating form EBOM to PBOM, simulatiing and optimizing assembling process based on DELMIA, and lightening the 3D models, which are the technological foundation to implementation of building the assembly resource database, designing the assembly process planning, visualizing assembling process and informations. The visualization system for aircraft assembly simulation is developed and built based on C/S networked mode, which could be applied in aircraft assembly workshop. The system platform is industrially test taken the forward cargo door of one civil aircraft for example, it is proved that this visualization system could be applied in aircraft assembly field as guidance of assembling production, the accuracy and the efficiency of parts and components' assembly are improved distinctly.

Abstract: Flexible assembling fixture (FAF) is a new-style assembling equipment in assembly process of aircraft panel components, which is developed based on combination of digitization of assembling and automated modular fixture. The multi-actuator is designed to positioning and clamping the panel component. The dynamic behavior of the FAF is analyzed in process of 3D structure design. The motion and displacement of every actuator are analyzed based on kinematic and dynamic theory, by means of building the Knopoff model taking friction between the vice sport into account. ADAMS is employed to carry out the dynamic simulation. This technical approach is the effective solution for developing the new equipment; moreover, its result presents a great engineering significance in improving the equipment performance.

Abstract: The dynamic characteristic of flexible assembling fixture (FAF) for aircraft panel component is analysed by the method of finite element modal analysis. Consequently, the every order of natural frequencies and mode shapes of given different postures of the FAF are obtained. It structural weakness were pointed out through the analysis results of the modal vibration characteristics. The properties of mass and stiffness of the FAF's components are concurrently calculated, whose optimal matching and harmonizing with each other have great influence on the dynamic vibration characteristics of the FAF. As the results of these analysis, the design improving suggestion for the FAF is put forward.

Abstract: On the basis of analysing the quality of traditional working procedure in the production shop, this paper proposes the application of SPC into the quality management system of production shop with the combination of manufacturing conditions in current digital production shop. From the view of selecting the quality parameter of critical manufacturing procedure, this paper diagnoses, analyzes and monitors the quality of the data to promote the application of the quality management system in the digital production shop so as to reduce the manufacturing cost and the quality control cost in the manufacturing process.

Abstract: The reverse modeling solution and its key technologies about complex part with internal cavity are introduced in this paper, taken the casting valve body for an example. The melt silicon rubber is injected in the valve body to duplicate its internal cavity surface, which is transformed into the external surface of the concretionary silicon rubber entity. The technical hurdle of collecting internal cavity surface data is solved. The key modeling technologies are studied according to data of spot cloud collected by laser-scanning approach, data preprocessing of spot cloud based on synthetic method, respectively constructing contour curves of internal and external piping surfaces, building the sold models corresponding internal and external surfaces on basis of alignment of their coordinates. The final CAD model of valve body is created after Boolean calculation of two sold models. This technical process is be efficiently used to solve the bottleneck of the rapid design and lean development about part with internal cavity structure.

Abstract: The functional and structural models of networked collaborative design system based on project management are brought forward in this paper. Its typical workflow is defined according to the system architecture. In process of studying implementation mechanism of collaborative design system, the algorithm of Fuzzy Analytic Hierarchy Process (F-AHP) is employed in choosing partners as personnel management mechanism, the method of Design Structure Matrix (DSM) is applied in process of decomposing and assigning design tasks, and weight-coefficient recursively statistic algorithm is used in controlling task schedule. The archetypal system of networked collaborative design based on project management is developed and tested, realization supported “multi-user &multi-task” is drown the conclusion.

Abstract: The welded bracket is an important supporting component with the structural complexity and crucial functional roles in a large-scale agitator. Strength and modal analysis on it are carried out with the finite element analysis software COSMOS/DesignStar according to the equipment’s working behaviours in presence of rational FEA model of the welded bracket being created with 3D CAD software SolidWorks. The conclusion is made from analysis results that the strength criterion is satisfied with operating requirement of the equipment, and the risk area of the tensile stress is explored, moreover, the dangerous natural frequencies are 41Hz and 95Hz which are worked out respectively through modal analysis results. This analysis process is significant for the agitator design. The technique foundation and method are not only set up effectively, but also the utilized data is provided for the product design and successive manufacturing. The lead time of the agitator will be shortened, and the product quality will be improved.

Abstract: The system of customer-oriented product cooperative design(COPCD) provides a platform for customers, on which the customer designers can participate in the cooperative design activity. Through researching on the structure of cooperative design system platform based on internet/intranet, the function, which is expressed with STEP standard file and online display via network, modified as well , in the form of product model created in Pro/E, was achieved by making use of VC++6.0 programming language and OpenGL technology. Moreover, the communication tool NetMeeting was integrated in this platform interface for the communication in the process of cooperative design activities. This system platform conceptually implements the cooperation between customer and designer, the product design efficiency and its success rate would be improved.

Abstract: The side-gusset plate is connector of the combined-roller, which is the key component of the High-pressure Grinding Roller equipment that is applied in crushing raw iron ore, Fracture occurred at the bottom of the side-gusset plate while the roller’s operation. For exploring the reason of fracture, the stress distribution and corresponding critical location of the side-gusset plate were computed and analyzed according to two working situations based on finite element method. The analysis result illustrates that it is the failure of infant mortality because of overloading, not belongs to fatigue behavior, with the presence of the component operating time and the fracture cross-section’s granular feature as well. This result is a reliable foundation for succeeding redesign and manufacturing of side-gusset plate and other component, the feasible plan was brought forward to improve the component operation’s stability.

Abstract: It is necessary to slot a groove on the outside of the bearing’s raceway in order to embed micro-sensor for smart bearing. Reasonable choice of slotting parameters for different type of bearings is one of key problems to be solved in smart bearing design. In this paper three-dimensional solid model and corresponding mechanics model for a segment of ball bearing’s out ring are built according to some reasonable simplification and supposition of boundary condition and loading status. Further more the influence of slotting parameters on smart bearing’s mechanical characteristics is studied with FEA method. Choosing 220 type of ball bearing as an example, theoretical analysis results of influence of slotting parameters on the maximum stress and deformation of outer ring are shown. The FEA results showed that micro-sensors for smart bearings should be manufactured flatter or the groove depth for micro-sensor embedding should be smaller soon as possible in order to insure the smart bearing’s original mechanical rigidity and strength.