Study On Visual Dynamic Modeling Technique Of Hydraulic System And Its Realizing Method In Software

Hydraulic simulation technique plays an important role in the design, analysis, and improvement of hydraulic system. It has been widely recognized in the relevant engineering field. Accordingly a lot of excellent dynamic simulation software of hydraulic system have emerged. Especially with the successful application of Power Bond Graph modeling technique in the dynamic performance analysis of hydraulic system, the researches in this field have been advanced greatly. However, an obstacle has been met in the way of the popularization and application of hydraulic simulation software based on Power Bond Graph modeling technique. A remarkable reason is that this kind of software is not fit for ordinary technical people who don't have the basic knowledge of Bond Graph.In order to promote the application and popularization of hydraulic simulation technique and to bring into play the advantage of Bond Graph technique in modeling, this dissertation carries out the researches on the visual dynamic modeling of hydraulic systems and its key techniques. The aim of the research is to relax the contradiction between the requirement of dynamic simulation and the faultiness of support software. Moreover, a general purposed simulation software of hydraulic system based on Bond Graph technique which is more useful, easy to use and popularize would be developed. The dissertation includes the following contents: the research on the whole makeup technique of visual modeling environment of hydraulic system; the study on visual modeling technique of hydraulic principle figure; the study on graphics modeling technique of Bond Graph; the study on automatic modeling technique of Bond Graph with non-standard junction structures; the design and development of the general purposed simulation software of hydraulic system.From the view of the application of system simulation, using visual interactive modeling environment to reduce the time of modeling and improve the communication between person and computer has become one of the hot-point of simulation technique. Based on graph and object-oriented technique, the dissertation establishes a visual modeling environment. It remedies the shortcomings of hydraulic simulation software based on Power Bond Graph in the foreside model input and treatment by introducing the modeling style of hydraulic principle figure andgraphical power bond graph.The dissertation puts forward a visual modeling method based on Power Bond Graph technique for hydraulic principle figure oriented completely. This method integrates the computer graphics technique, oriented-object technique and modularization modeling technique. It regards a hydraulic component as the basic treatment object or the Bond Graph model partition unit. According to the common modularization characteristic between hydraulic system and Bond Graph, the hydraulic component entity class library and its corresponding model description library are established. In order to decrease the difficulty of graphic recognition and to ensure the transformation from graphics to model exactly, the following measures are used:? the intelligent interconnection among hydraulic components and the collection of topologic information are operated synchronously.? a lot of signs are set in the hydraulic component model description library. In order to strengthen the capability of visual modeling environment in settlingactual problems, the research on graphic modeling technique of Bond Graph has been carried out. Visual modeling mode of Bond Graph is more intuitionistic and convenient than text modeling mode. And users needn't master the grammar and the format of relevant descriptive language any more. Especially A kind of "intelligent" automatic graphical creation of Bond Graph method is presented by introducing graph theory and artificial intelligence technique. This method not only improves efficiency of model input and foundation but also breaks an mformation transform path from hydraulic principle figure, Bond Graph model to the descr...