The Structure’s Analysis And Experimental Study Of Airdrop Multi-functional Vehicles

The frequent occurrence of earthquakes, tsunamis and other natural disastersseverely damage roads, railways and other rescue passages, delaying thepost-disaster relief work, thus resulting in heavy casualties and economic losses; inorder to strengthen the strategic defense in wars and armed conflicts, improve thelogistical supplies under various terrain conditions,improve the speed of troopsmoving into the target areas, andsolve theproblem of manpower shortage inaffected areas or war zones, and greatly improve the rescue efficiency and meet theemergency in wars, enhance theconstruction support capability of rescue teams andtroops, it is particularly important to develop multi-functional airdroppedconstruction machines.According to the comparative analysis on the mature multi-functionalconstructionmachines, based on the development of new products on the basis ofmature technologies, the skid steer loaders are selected as the multi-functionalair-dropped machines and redesigned. The multifunctional construction machineswill be designed and developed by new design methods. The technical solution ofthe skid steer loader manufactured by a well-known machinery company in Chinais selected as the blueprint. The frame, drive system, hydraulic system, electricalsystem, covers, work implement, cab and auxiliary airdropping devices will beredesigned and the optimumattachments will be selected and refitted to meet therequirements of military airdrop multifunctional constructionmachines.Based on the analysis of the present skid steer loaders, this essay calculates theparameters of the multifunctional airdropped machines and mathematicallyanalyzes the airdrop process. The3D virtual prototype model of airdroppedachinessis established by PRO/E software based on that of thepresent skid steerloaders, and the airdrop process is analyzed by finite element method by using theFlexible Dynamic Analysis Module of the ANSYS Workbench. Meanwhile, itsequivalent airdrop test has been carried out. These lay the theoretical and experimental basis for the actual development of the multifunctional airdroppedconstruction machines.This essay includes five parts.Part1describes the demand for multifunctional airdropped machines, as wellas the development situation of airdropped construction machines at home andabroad, and confirms the advantage of the skid steer loaders as the multifunctionalairdropped machines,determinesthe general requirements for prototype,establishesthe design plan. And it gives the main contents of this essay.Part2describes the main structure of the multifunctional airdroppedmachines andcalculates the parameters. Then it introducesand theoretically analyzestheprinciples of energy absorption during the airdrop process andthe machine bufferprinciple.In Part3, the3D virtual prototype model of airdroppedconstruction machinesisestablished by using PRO/E software,based on the virtual prototype model of thepresent skid steer loaders. The model is simplified reasonably. And the simulationof the airdrop process is carried out byusing the Flexible Dynamic AnalysisModule of the ANSYS Workbench. The stress cloud chart of the entire machine isgenerated. The analysis shows that the overall strength of the model canmeet therequirements of airdrop designs. The stress of some structures is too high due to theunreasonable simulation settings.In Part4, the equivalent airdrop test is done to the prototype of present skidsteer loaders to verify the correctness of the theoretical analysis in Chapters2and3.The prototype is lifted to a height of3m and dropped. The stress changes at themoment of dropping on the ground are analyzed. The stresses at total20test pointson theentire machineare measured and compared. The results show that theimproved multifunctional airdropped machine can meet the requirements forairdropping and also verify the correctness of the theoretical analysis in previouschapters. These lay the practical foundation for the development of the virtualprototype of the multifunctional airdropped machines.Part5summarizes and concludes the essay. The airdrop process of the multifunctional airdropped machines is concluded and the design plan is affirmed.Andseveral shortcomings and subsequent work are suggested.