Study On Virtual Fatigue Test Of Straddle-type Monorail Bogie Frame

Development of urban monorail transportation technology depends largely on theprogress of monorail bogie technology. Frame as the foundation of the bogie, which isone of the most important parts in monorail vehicle, its structure performance directlyaffects the operation quality and safety of the monorail vehicle. Wheel on the axle boxdevice, spring damping device, traction drive, foundation braking device and vehiclesuspension device are fit together by framework, which is the skeleton of bogie drivingrunning gear and the key bearing component of bogie. Therefore, the frame structuresafety is one of the important goals of monorail vehicle research.Fatigue design of bogie frame is one of the essential processes of frame structuresecurity and effective fatigue prediction becomes the key technical support for fatiguelife design. While fatigue test performed on physical test bench has become the mostreliable and convincing method of fatigue prediction, it’s quite expensive and would bedetected after the new products developed. Once the new product design has anydefects, it must be redesigned, reproduced and retested. So, the physical test-bed not only extends the research time but also greatly increases the development costs. Imitatingthe physical test bench, virtual test bench, a parametric and digital virtual prototype, isbuilt by using the three-dimensional modeling software, the finite elementsoftware andthe multi-body dynamics software. As physical test bench’s short comings made up,development time shorten and development costs decreased, virtual test bench canprovide reference for physical test bench, thus reducing unnecessary losses.Chongqing urban monorail vehicle bogie frame is taken as the research object inthis paper and virtual test bench is set up by using virtual prototype technology, thuspredicting the whole life for the high stress area of the framework. First of all,3dmodel and finite element model of virtual test-bed for bogie frame are built, verifyingthe structural strength of the test bench. Then, monorail bogie frame finite elementmodel is established, its C-B modal is calculated to get modal center file and thestructure strength of the fabric is verified by calculating its strength. Finally, the coupleof the test bench and the framework is realized. On the basis of relevant standards,virtual fatigue test simulation is carried out to get the loading course of the frame andthe fatigue properties of related materials. Fatigue life of the high stress area is calculated in Fatigue. Analysis shows that the frame’s fatigue life is greater than itsdesign service life and framework design in this paper meets the requirements.