Research On Some Load Technique Problems Of The Trailway Out-Of-Gauge Freights

Thanks to rapid social-economic development and scientific progress, railway transportation in China has made giant strides and greatly improves people's life level and travel quality. At the same time, fast development of the society and people's life level raises higher and higher requirements on railway transportation. Out-of-gauge transportation, as a special railway freight transportation method, plays an important role in social-economic development. However, out-of-gauge transportation is facing many new tasks and challenges because nowadays more and more goods are of irregular shape and unbalanced weight distribution. Due to inadequate safety monitoring system, loading decision-making system and low-level informanization system, current out-of-gauge transportation cannot meet the new requirements. That is to say, how to improve loading technology under the current speed limit or after speed increase is very important. Therefore, this paper is of great theoretical and practical values.Railway out-of-gauge freight transportation means transportation organization of freight car whose any part goes beyond the rolling stock gauge or loading gauge in special section (if the freight car is arriving at or passing the special section) when the freight car stays on a horizontal straightline and longitudinal centerline and centerline of the car are in the same vertical plane. Considering current railway freight technology and development trend of railway transportation, this payer analyzes the factors influencing out-of-gauge freight transportation in combination of system engineering method and loading & fixing theory. In addition, the paper also makes modeling analysis and verification of safety monitoring of freight loading and intelligent decision of loading plan. This paper mainly focuses on comparison and simulation research of relationship between speed limit and gravity center height limit, gravity center offset and gravity center height. Examples on how to realize reasonable gravity centre height, gravity center offset and speed limit are also given in this paper. Main research results are listed as follows:1 ) Firstly, We focus on the influence factors of overloaded cargo's transportation and its safety monitor. These factors including the vehicle for overloaded cargo, railway clearance, management factors, and so on. As for the safety monitor, we analyze the principles for overloaded cargo's safety control and the safety monitor system.2) Secondly, We study the practical height of center of gravity of cargo loading and the limits of center of gravity transverse deviation of cargo. On the other hand, the height of center of gravity of cargo has great effect on the speed of train is also investigated. In order to reduce the level of over-loading of cargo, to raise the speed of train as well as to insure the safety of the transportation, we should study the relationship of the high center of gravity of heavy-haul train and the speed limits, as well as the relationship of the restriction of the transverse deviation of cargo's center of gravity and the restriction of freight train's height of center of gravity. According to the force condition of trains, we investigate the unfavorable force condition of stability from capsizing and derailment stability of trains. With the most unfavorable conditions, we use the styles of D5, D20, D23, D30 cargoes as examples and make two kinds of overturn models and two kinds of derailment models (one considers the rolling angle of trains and the other do not consider it) .Furthermore, simulation calculation is made with matlab to examine the relationship of the overturning coefficient with the height of center of gravity of heavy-haul train and the speed of trains and center of gravity shift of cargoes, as well as the relationship of derailment coefficient with the height of center of gravity of heavy-haul train and the speed of trains and center of gravity shift of cargoes. On this basis, we also analyze the relationship among the limits of the center of gravity of trains, the center of gravity of heavy-haul train and the limit of the speed of trains, as well as the relationship of the restriction of transverse deviation of center of gravity of cargoes and the utilization of vehicle loading.3) Thirdly, We analyze the loading decisions for overloaded cargo. Since it is extremely complicated to make a decision for overloaded cargo's loading, we make a mathematical model as well as an actual example to get the decisions of overloaded cargo's loading issues.