Research On Rational Center Height Of Gravity For Car Loaded Of C62A Gondola Car

The center height of gravity for car loaded is a basic technique standard of our railway. It can guide car loading in locale and ensure train running safety. Now the center height of gravity for car loaded standard in our country is from "temporary regulation for railway cargo transportation" in 1950 and the height is 2000mm. Compared with other countries, the height is on the low side. The height limits the increase of axle-load and also restricts the raising of train speed. So the research of the height and ensuring reasonable limit standard is an efficient way for improving transportation efficiency in our railway. For the purpose of it, the paper simulates the center height of gravity for car loaded from the point of dynamics.At first, the developments of vehicle dynamics and the simulation of "three-piece" truck are introduced. The paper also explains simply the multiple bodies simulation software SIMPACK. Based on the study of SIMPACK and analyzing the structures of the vehicle and bogie, the simulation model of vehicle is set up. When building the model, we consider many nonlinear factors, and we use the track spectrum of USA which is similar with our track. Vehicle dynamics is mostly analyzed from three sides: vehicle lateral stability, riding, curve negotiating performance, and their evaluation ways and evaluation indexes are introduced in the paper. On the basis of original parameters, important parameters of the bogie have been optimized by using the simulation model. The paper puts emphasis on the influence of the center height of gravity for car loaded into vehicle dynamics performance. It calculates the reasonable height in different speed, different loading when vehicle run on beeline and curved track.Based on the single-vehicle model, the paper sets up a three-vehicle model and analyses the difference between the two models. It also analyses the difference among vehicles in three-vehicle model. The paper gets the conclusion that the dynamics performance of single vehicle is better than the three-vehicle model. And then it simulates three-vehicle model dynamics performance in different center height of gravity on beeline and curved track. It considers two different conditions that the center of gravity is in the center of car and the center of gravity is at the maximal permissible lateral offset. Finally, we get the rational height of three-vehicle model under different conditions by analyzing vehicle dynamics index.At last, by compared with experiment result in locale, we validate the reliability of dynamics model. Sequentially, it testifies the center height of gravity for car loaded we get is credible, and it has value for consulting to a certain extent.