| Massive-products refer to those huge products under either of the following conditions: height equal to or over 40 meters, width equal to or over 5 meters, or weight equal to or over 300 tons. Transportation of Massive-Products means transportation of those products with excessive length, width, height or weight. With the rapid development of China's economy, lots of power plants and big factories are being built in many places. Thus it became much more important to transport the large equipment which is related to the success of those projects. It should be ensured that these items are conveyed safe and credible, because they are usually key equipment of the important projects of the country and with long producing circle as well as high prices.The process of transportation of Massive-Products will encounter all kinds of problems due to the excessive height, width and weight of the specified vehicles. Whether the vehicle could safely pass the roads under all kinds of conditions is mainly dependent on the drivers'judge according to their experience. But once there's a misjudgment, destructive execution is usually done to let the vehicles pass because the vehicles for transportation of Massive-Products could only move forward rather than backward. As a result, it is necessary to do theoretical researches on whether or not those vehicles could pass the roads under all kinds of conditions. This paper is mainly about building mathematical model on the basis of analyzing factors affecting the Transportation of Massive-Product on roads by which a computing and simulation software has been made to test exterior passing ability of vehicles for Transportation of Massive-Products in Shenyang. This software, using Visual C++ 6.0 Modula, can help the working staff to find out whether or not the vehicles could smoothly pass the roads, toll gates, arch of bridge or roadblocks. It is used in the decision-making phrase of transportation and help to choose appropriate routes for the vehicles.Gaining support from Yuyang Massive-Products Transportation Co. Ltd, this paper has combined the author's researches during his study for Master's Degree with some related achievements in this field both at home and abroad. It includes a series of researches concentrating on exterior passing ability of the vehicles in Transportation of Massive-Products. Abstract of the contents are as follows:1. Introduction is about the following items: the researching background of this paper, the status quo of the development and research in Transportation of Massive-Products both at home and abroad, as well as the problems in the current situation of Transportation of Massive-Products.2. Model building of vehicles goods and roadblocks. At first this paper introduces the software being used in building these geometrical models, AutoCAD and OpenGL, as well as some related methods. Second it elaborates the process of building the vehicle model which falls into four parts: tractor, pitman, flat car, and overalls in terms of the geometrical shape of the vehicles. And details are also been given on the process of model-building of each part, especially on the process of model-building of pitman and plat car. Third it briefly introduces the goods condition in Transportation of Massive-Products. Different shape and size represent different parts of goods model: rectangle cylinder and sphere etc. whose model-building processes are also introduced briefly in this section. At last, it explains the model-building process of roadblocks. The vehicles usually encounter a diversity of roadblocks such as trees, telephone poles, cables, buildings etc. Different roadblock models are built respectively according to these items.3. Model-building of roads. When accurately simulating the running situation of vehicles for Massive-Products Transportation, the key part is to build precise road models. According to the Roads Technology Code, the road models built by the author of this paper are divided into roads surface, cross road, convex curve, toll gate, arch of bridge, tunnel and narrow bridge etc. With regard to the roads surface model-building, this paper elaborates three parts, i.e. linear model-building, circle curve model-building and transition curve model-building. And the importance lies on the last two parts. When running through city roads, vehicles for Massive-Product Transportation would frequently encounter crossroads. Models for crossroads can be divided into Cross Type, T Type, Y Type, and irregular types according to roads distribution. The model-buildings of convex curve, toll gate and narrow bridge are comparatively simple. The basis of model-building for convex curve is gradient, for toll gate is its height and width, and for narrow bridge is road width, tonnage limits etc. However there are many factors regarding the tunnel due to the diversity of the type of tunnel. Thus its model-building is comparatively complicated, and are emphasized in the paper.4. Research on the apparent Safety-applicability of Transportation of Massive-Products. In terms of the built models of vehicle and road, researches on the apparent safety-applicability of Transportation of Massive-Products have been made and the related vehicle models under various roads conditions have also been established. Firstly, the author gives a brief introduction about the safety-applicability when the vehicles are respectively going through the straight line, toll gate, and narrow bridge. The judgment on whether vehicles are applicable for transportation is based on the comparison between the size of the vehicles and the specific situation of the roads. Secondly, the author elaborates the safety-applicability of the vehicles when turning off the corner. When vehicles are in the process of turning off, and then the turning radius become smaller, thus, here comes such a difficulty in judging the safety-applicability by calculating the turning radius. Thirdly, the author introduces the safety-applicability when the vehicles pass through the arch of bridge, protruding curve. The author presents the corresponding formula in order to get more accurate judge of vehicle safety-applicability. Finally, the author briefly describes the safety-applicability of vehicles passing through roadblocks which resulted from the vehicles'features such as length, width and overweight. In this paper, the author expatiated upon the safety-applicability of the vehicles when turning off and passing through roadblocks.5. The Establishment and the Simulation of the Software of Transportation of Massive-Products. Firstly, the author introduces the development of establishing the Simulation Software, including the analysis of software, design of Function Module. The Function Module consists of Road Module, Vehicle Module, Roadblocks and cargo Module, Computation Module for Safety-applicability of Transportation of Massive-Products, Three Dimensional Simulation Module, and Data-base Module. Then, the author elaborates the development of establishing the data-base software and how to maintain. Afterward, great importance to the manufacturing process of Simulation Software is attached and detail explanation about its various levels is given. Finally, the author cites three real examples to test the safety-applicability of the vehicles when transit toll gate, narrow bridge, crossroad with three dimensional simulations, so as to prove the applicability of the software.6. The researches are concluded in this part and its main summing-ups are also given. At last the author pointed out some deficiency in this paper. |
PDF Full Text Request