Study On The Optimization Design For Vibration Reduction System Of Containerization Transportation

Containerized traffic is one of the main modes of transportation for modernlogistics support. Sophisticated medical equipment and highly purified bloodcomponents are important logistics strategic materials for emergencies and disasterrelief. Due to transportation under special circumstances, high-strength shock andvibration often cause damage to the equipment and the failure of blood. Containerizedtraffic of precision instrument and equipment was taken as the research background tocarry out research work about optimization design for vibration reduction system ofthe containerized traffic, to reduce shock and vibration intensity of strategic materialsin containerized traffic process and to ensure efficient and safe transportation of vitalsupplies.First of all, the finite element model of container was established, and modalanalysis was performed, from which various modal parameters and modes within thefrequency range of100Hz were obtained. Results of modal analysis showed that themode shapes of containers were mainly manifested as bending of the plates, but theeight corners of structural framework were nodes of vibration mode and bendingmodes did not exist in the frequency range of20Hz in frame beams. According to thecalculation results of the modal, it is determined that the fixed points of dampingmechanism were the eight corners of structural framework and the support points offrame beams. Therefore, the elastic vibration of container would not be transmitted tothe damping box through damping system, thus reducing the vibration of dampingbox.Secondly, vertical vibration dynamical equations considering vulnerable partsand shock dynamical equations considering rotational coupling about the vibrationreduction system of containerized traffic were built, according to Newton’s second law.The dynamical performance of the system under natural vibration condition andaction of a half-sine pulse were discussed using Runge-Kutta method in order toinvestigate the effect of factors such as suspended angle, damping ratio on vibrationand shock. Under natural vibration condition, the results show that decreasingsuspended angle, increasing damping ratio and mass ratio at low frequency ratio canrestrain the acceleration response of vulnerable parts. Under action of a half-sinepulse, centroid position should be as close to the geometric center of system aspossible, the shock response of system reduced when choosing smaller suspendedangle and increasing damping ratio properly. Again, the influence of the main parameters of suspension vibration reductionsystem on vibration response was analyzed. Then the design of containerizedtransportation damping system was optimized. Take the sum of RMS in threedirections as a objective function, the displacement of damping box as constraints tooptimize spring stiffness, damping ratio and spring suspension angle of dampingsystem. The optimum design parameters of damping mechanism were obtained. Thecontainerized traffic system of reduced scale was designed, and the design methods ofcontainerization damping system and accuracy of the results were verified by the testresults.