The Vibration Isolation Design Of Emu Carbody And Traction Transformer Device

With EMU speed and the designing of lightweight carbody continuously improving,the suspension devices under the carobody such as traction transformer vibrate seriously.Many scholars,engineers and technicians come to realize that many adverse consequences cause by increased vibration of suspension devices under the carbody,which has launched a study on isolation design of vehicle suspension equipment under EMU.In this paper,for the design problem of rubber isolator stiffness between the carbody and the vehicle suspension traction transformer devices,static stiffness problems have conducted a more in-depth research and analysis.suspension stiffness of traction transformer has been designed based on the frequency matching and static deflection isolator design principles.lateral stiffness and vertical stiffness has been given.Related to computer simulation have been completed through SIMPACK soft lastly.Getted on the transformer power and torque equation based on a simplified force model of the transformer while designing stiffness.Designing isolator stiffness method under the given conditions of static deflection and calculating each isolator static deflection method under the given conditions of isolator stiffness have been obtained according to geometry compatibility equations of 3 points coplanar conditions.static stiffness of an EMU traction transformer has been designed as an examples.Isolator stiffness conditions are given.Based calculating each isolator static deflection method under the given conditions of isolator stiffness.each isolator static deflection has been obtained.Consider each isolator static deflection difference,each isolator static stiffness which static deflection difference within the range of 1mm are obtained.Consider the principle of each isolator static deflection in the range of 6?7mm,best static stiffness and static deflection corresponding each isolator are obtained.The range of lateral stiffness and vertical stiffness has been designed based on the frequency matching,static deflection isolator design principles and the ratio between lateral stiffness and vertical stiffness.These laid the foundation for further simulation.A three-dimensional rigid-flexible vibration coupling dynamics system model has been established,which the rubber isolator horizontal and vertical stiffness has been changed.Therelationships between transformer RMS,vibration intensity,carrbody floor vibration stability Sperling value,transformer-floor vibration transmissibility and isolator stiffness has been got.Conclusions were obtained which transformer vibration intensity and carbody floor vibration stability Sperling value are the optimal value while vertical stiffness in the range of kz=(1.8-3.8)×106N/m and lateral stiffness in the range of ky=(0.4?0.8)×106N/m.