Railway Hub Line Cad Key Technologies

The route design of railway hub is involved with numerous routes, the relations of which are extremely complicated, along with many restrictions. Railway design institutes are faced with increasingly heavy mission of route hub design, for traditional design methods can not meet the need of practical production for the massive and intricate calculation, while internal research on CAD technique of railway hub route design remain quite lacking yet.Therefore, aiming such problems in hub route selection as massive lines, complcated relation and coexisting restrictions, on basic of existing design software systems of newly-built and rebuilt railway, a CAD system on railway hub route design is provided in this paper by deeply analysis on design methods of different routes of railway hubs. The main work are as follows:The characters and relations of different routes of railway hubs are deeply studied. Longitudinally, framewok of cluster-type-group-line is established for swift index and classification, as well as respectly chat for memory and administration of routes relations latitudinally, by which efficient organization and administration on hub routes and their extremely complex relations are realized.By application of instantiation techtique comprehensively, routes cases of resident memory are created on demand for calling anytime. Acording to the calling frequence and time, the cases with a lower reference probability are to be unloaded dynamicly so as to induce the time occupied and to control the memory cost within a reasonable range.Longitudinal slope selfdefinition object with horizontal and vertical alignment is defined on basic of ObjectARX selfdefinition technique. Followed by research on automatic contact solution of route longitudinal plane with restriction of turnout or turnin, and realtime solution of routes reciprocal bond, which has brought realtime dynamic couple definiton of routes into reality.Coordinate calculation methods on intersection among line elements are widely studied, prejudge strategy on second class line elements intersection based on longitude and latitude coordinate interval prejudge and line elements prejudge is purposed, by which time on calculation of routes intersection coordinates is greatly induced, and realtime dynamic solution of routes intersections coordinates come true.A railyway hub route design CAD system is programmed with tools such as VC++.net2002 and ObjectARX2006, and engineering cases are conducted to testify the precision and practicability of the process.