Development And Research Of NX-based Automobile Vision Checking And Validating Tools

Along with the increasing depth of automobile in people's life, performance requirements of automobile have been constantly enhanced. Not only does it require automobile to have a beautiful shape, good power and economy, reliable operation stability, moreover to have a better field of vision performance. Vision performance of automobile is an important segment during the procedure of auto-body general layout. It directly influences automobile's travel security, comfort and operational convenience. So, it requires that the body designers fully apply the modern body design methods and ergonomics theory in the body structure and internal layout design, and enable the drivers to obtain the best field of vision under certain conditions by the most comfortable sitting posture. Therefore, the checking and validating of automobile vision plays an important role in automobile field of vision's design. In the conceptual design phase, it not only can judge the quality of driver's vision, but also can evaluate the reasonableness of initial design and layout, and change the design size in time, if necessary. So the development and research of professional automobile vision checking and validating tools has the theoretical and practical significance.After understanding the domestic and foreign relevant theories of vision design, this paper focus the research content in the vision of 360°assessment, the front lower view of automobile and the BC pillar obstructions, which are researched few at present. Combining the computer-aided design, which widely used in modern body design, this paper utilizes UG/Open API, UG/KF, UI Component and so on re-development technologies in UG/NX development platform. It completes the development of automobile overall vision checking and validating tools, and researches on the vision design of auto-body C pillar and hood.The Unified Development Unit of UG/NX is user's re-development platform offered by UGS. Using the open code that UG/NX provides, one can almost carry out all the functions existed in UG/NX. The design rule and experiences can be collected into the product model by using the KF language. Using UI Component, a good interface can be designed. In the development work of this paper, UG/Open API, KF and UI Component are used. The function and interface of modules can be achieved.This paper researches on automobile vision checking and validating in the conception design stage. The tool is used, to those which vision has been designed to meet basic standards body model, to check them the direct vision. The tool of the overall vision checking and validating is a rough check of 360°driver's vision. The vision is divided into four parts, including front, rear, side and pillar, in order to measure the different angles or distances. In front vision, front upper angle, front lower angle, hood invisible distance and road surface invisible distance are measured. In rear vision, rear upper angle, rear lower angle, T/LID visibility consideration and road surface invisible distance are measured. In side vision, Dr side upper angle, Dr side lower angle, Asst side upper angle and Asst side lower angle are measured. About pillars, there are Dr side A-PLR obstruction angle, Asst side A-PLR obstruction angle, Asst side B-PLR obstruction angle, Asst side C-PLR obstruction angle, FR view angle, C-PLR(D-PLR) view angle and RR view angle to be measured. The completed module can automatically calculate and generate eye points through importing H-point and vehicle parameters. Then different eye points are selected to measure values. Partial vision checking and validating is a particular check after overall vision check. About the vision check of C-pillar, perspective is used to create the visible view with Motorcycle at passenger side, in order to evaluate C-pillar structure and location design. About the vision check of hood, an arithmetic of section curves to obtain tangent point is used. Through the obtaining limit line, the quality of hood vision design is evaluated. The two methods of partial vision checking and validating can be used not only in C-pillar and hood, but also in other parts of auto-body, even can be used for other transport vision design. The application of the two methods is relatively extensive.Conception design is very important for an auto-body design. Auto-body structure and most parameters could be determined in this phase, while some parameters would impact the validity and cycle of following work. In the other hand, the cost of conception design nearly comes to 70% of the total development's. Changes in this phase are most easy to be carried out and lowest cost to be spent, while they would do best for save product's cost. Therefore, concurrent engineering and cooperation could be used in this phase to consider product's manufacturability, assembly and maintenance-ability. They would greatly help to reduce or avoid the following reduplicated work and shorten the development cycle.The re-development technique of auto-body based on NX is provided by UG/NX. It can simplify the repetition work in the body design, and help to realize cooperation in the design. This technique will improve the efficiency and quality of body design. Also it will shorten the development period and reduce the development cost. Finally, the test results confirm the module usability and fully manifest the advantages of this design method.Automatization and intelligentization of auto-body design are current pop topic. This paper mainly discusses the development and research of NX-based automobile vision checking and validating tools. It could be studied as a reference of auto-body design module development for conception design phase.