Analysis Of Slab Track's Dynamic Performance And Study Of Parameter

With the rapid development of modern high-speed railway and city mass transit, slab track of which character is less maintenance or no maintenance was developed rapidly. This thesis focuses on the slab track on Qin-Shen passenger railway. A slab track and high-speed vehicle vertical coupling dynamic model is established. In the computation model, the track slab is simulated as elastic thin plane element instead of simplified beam element according to its geometrical feature and mechanical character.Toward the typical shortwave unevenness that possible appear on slab track, such as welded joint unevenness, track slab stepped unevenness, etc. a systemic analysis is carried through. Based on the analysis result comparison, the reasonable restrict of typical shortwave unevenness is indicated. That is on mid and high speed railway lines, sunken welded joint unevenness, δ1 +δ2< 0.3mm, especially to the shortwave one( δ< 0.1m ), δ2 < 0.1mm , while to the raised welded unevenness, δ< 0.5mm, and to the stepped track slab unevenness , h < 2mm.A study of parameter work is processed using the vehicle and track model. The key parameter is the rigidity of the fastening system and the height of the CA layer. The analysis results indicate that reducing the rigidity of the fastening system can improve slab track and vehicle's dynamic property, but too low rigidity can cause great resistance to prevent train moving ahead. The reasonable rigidity of slab track's fastening system is 30~60kN/mm. Through the dynamic analysis of the changing of the CA layer, we can conclude that CA layer's height isn't a key influence factor of slab track and high-speed vehicle coupling model. We can define the CA layer's height from the point of construction convenience and economical efficiency.