Research On Vibration Characteristics And Damping Technology Of A Special Vehicle

Due to the working condition,special vehicles suffer from long-time vibration which may have adverse impact on the operators and instruments on board.Therefore,it is required that the special vehicles should not only have good traffic ability,power performance and concealment,but also have strong anti-vibration performance.Taking a certain type of special vehicle as the research object,theoretical analysis,simulation analysis and experimental analysis were applied to optimize the anti-vibration performance by attenuating the response amplitude.Thus,the comfort of electronic cabin and the durability of precise instruments and equipment in the electric cabin could be enhanced.Firstly,simulation analysis and modal test method were used to analyze the vibration performance of the composite plate simple model,verify the feasibility of modeling method using a sandwich structure made up of shell elements and solid elements and common node processing the connection relationship,in order to obtain a reliable finite element modeling method of wall structure of special vehicle.Secondly,the vibration response tests of the power station cabin of the special vehicle were conducted to calibrate finite element model of the power station cabin.The error of vibration acceleration amplitude between simulation and test is within15%,which can ensure that the established finite element model of power station cabin is reliable in the simulation analysis.The vehicle finite element model is established based on this method,and the vehicle vibration characteristics were analyzed by using frequency response analysis.Then,the vehicle vibration control goal that the vibration acceleration of the floor and the walls of electronic cabin should be less than 0.35 m/s~2 was set,according to GB/T13442-92.The influences of the three methods of putting the aluminum frame structure into the walls of electronic cabin,a split platform and installation of vibration isolators at the bottom of the electronic cabin on the trend and extent of vehicle were obtained,taking accelerations under the fundamental vibrational frequency and the corresponding harmonic frequencies as the excitation of the frequency response analysis based on vibration control methods.Finally,accelerations under the 1/3 octave center frequency range between 0 Hz and 400 Hz were used to explore the specific selection of vibration isolators effect on vehicle vibration characteristics.After considering the reliability and durability of the vibration isolators,six rubber vibration isolators were chose.Compared to the original vehicle,the vibration response amplitude of final optimized scheme decreased more than 80%,and the vibration acceleration of the floor and the walls of electronic cabin were within 0.2 m/s~2,which satisfied the goal of vehicle vibration control.Comprehensively using the research methods of simulation analysis and the vibration test,this thesis presented some exploratory ideas and plans for improving vibration performance of the special vehicle,which shows good engineering practice value and theory reference significance.