| Vibratory roller is the key equipment of modern road construction，the cab rolloverprotection structure（ROPS，that is Roll Over Protective Structures） is one of the mostimportant components. Requirements of the construction site safety modernization is more andmore high, how to improve the ROPS to better protect the driver safety of life and propertyhas become one of the hot research both at home and abroad. In this paper, we use theapplication of nonlinear finite element and finite element method of system analysis toestablish the simulation model of ROPS structure, and we have analyzed the original and theimproved ROPS structure with lateral loading, vertical loading and longitudinal loading, at thesame time, we have conducted some corresponding experimental study.I have summarized the research on the structure of ROPS at home and abroad, andanalyzed the requirements of the ROPS structural properties in detail. Application of nonlinearfinite element and finite element of multi-body system method to establish the simulationmodel of ROPS structure, and use the test method from the perspective of lateral loadingminimum capacity, energy absorption requirement to study the effect of the performance ofshock absorber, the plastic hinge hole and shock absorber cabin connecting plate thickness.Study the original ROPS structure experiment and do a simulation research, the resultsshow that the main cause of shock absorber connecting plate tearing is that the original ROPSstructure stiffness is too large and the shock absorber too small, structure of ROPS plasticdeformation stage is the structure of energy absorption stage, and we have put forward themethod of opening the plastic hole in the main bearing element, in order to reduce the ROPSstructure stiffness, and maked sure the ROPS structure get into the plastic deformation stage.And we emphasize the ROPS lateral loading performance. we choose the absorber ofappropriate radial stiffness to replace the original one, in order to solve the problem ofabsorber tearing in the process of increasing load. Research also shows that, through openingthe plastic hinge hole in the back column, to guide the cab pro tection structure of plasticdeformation, it can absorb more energy, besides, increasing the plate thickness have solved thetwist deformation problem of connecting plate, and have a small effect to the maximum displacement of absorber bolt connectionsWe carry out simulation research and experiment research for the new ROPS structure,and we have validated the influence factors of ROPS structure lateral loading performance inthe fourth chapter, solved the problems about the absorber tearing and absorber cab connectingtwist deformation at the original ROPS structural test, and through the comparison of thesimulation results and the test results, we summarized the cases in the test,and analyzed theerror curves of displacement and load, for providing better reference to further modify thefinite element model and the design of ROPS structure. Research results can effectively applyto all types of ROPS structure and similar structure design and analysis, and have goodresearch value in the aspect of improving the quality of products, ensuring the safety of thestructure. |
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