| In order to meet the increasing transportation needs of China Main Line and rapidly advance the related High Power AC Transmission Diesel Locomotive equipment, Ministry of Railway (MOR) decided to procure a batch of High Power AC Transmission Diesel Locomotives from overseas and importing their advanced and higher technology designing and manufacture methods.This kind of High Power AC Transmission Diesel Locomotive has double driver cabs and inner corridors. The whole carbody can be divided as:driver cabâ… , wash room, electrical cabinet, dynamic brake room, clean air cabinet, power room, cooling room and driver cabâ…¡. There are two 3-axle bogies at the lower part of the loco and fuel tanks are integrated in the carbody. It's with isolated individual driver cabs and truss load-bearing structure for damping design. The underframe, as a base bearing the whole carbody, not only supports the weight of the whole carbody and its inner components, but also transfers the tractive effort and brake force, as well as the complicated dynamical stress, so it should have enough strength and certain rigidity. Thus, carbody weight-lighten design is a very important purpose for us. Early diesel loco often is designed as lower power and running speed with stronger underframe strength, but as higher diesel power and running speed is needed, advanced weight-lighten requirements was raised up. This kind of design needs to utilize each of the primary components into weight supporting, such as side wall and proof cover, meanwhile, this made weight-lighten design much harder than other designs.During the High Power AC Transmission Diesel Locomotive development, an advanced design method CAE is adopted to carry out FEA calculation and analysis for the carbody and some main components. Ensure safeness for loco's operating and strength. Some static strength tests will be performed on the loco complying with TB/T2541-95 <Diesel and Electrical Locomotive Carbody Static Strength Test Procedures> and <Carbody Static Strength Test Schemas> after the carbody having been manufactured out. These tests are to examine the static stress and flexibility of the carbody steel structure under a related loading operating mode and estimate the tests results so as to finger out if the carbody structure has met the requirements specified by the procurement contract and to test the accuracy of the FEA calculations. |
