Safety Performance And Optimization Research Of Mining Dump Truck Cab ROPS&FOPS

Large mining dump truck has the advantages of low transportation cost and high production efficiency,which plays a vital role in efficient energy mining.However,the work site of large mining dump truck is complex and its load is large.It is easy to have rollover accidents or be affected by falling objects in the working process,which may cause injury to the driver.Therefore,it is necessary to analyze and optimize the safety performance of the cab protection structure of mining dump truck.This paper takes the cab of a 200 t class mining dump truck as the research object,and carries out simulation analysis and optimization design on the safety performance of its ROPS&FOPS.The main contents are as follows:(1)The research background is described,the functions and types of ROPS&FOPS are introduced,and the importance of ROPS&FOPS for driver safety is revealed.On the basis of reviewing a large number of literatures,the research status of ROPS&FOPS at home and abroad is summarized,which provides ideas for the safety performance analysis and optimization design of the subsequent protection structure.(2)Combined with the type of ROPS&FOPS studied in this paper,according to the current national standards,the safety performance requirements and verification methods of ROPS&FOPS are introduced and interpreted.Considering the deformation characteristics and stress state of the structure during the safety performance verification process of ROPS&FOPS,the related theories of finite element are introduced.(3)The finite element analysis model of the cab of mining dump truck was established,and the safety performance of ROPS and FOPS was simulated by referring to the standard and combined with the research and development method of the performance verification of large mining dump truck in China,so as to obtain the mechanical properties of the safety protection structure under various working conditions.The lateral energy absorption process was determined as the dangerous working conditions through analysis.It is pointed out that there is some optimization space of ROPS in the process of lateral loading,which determines the idea for the optimization design of the following cab.(4)The optimal design theory is briefly introduced,the cab skeleton is grouped according to the symmetry and manufacturing requirements,the stress state of each group skeleton is analyzed when the original structure meets the lateral energy absorption requirements,and the design variables are preliminarily selected.In order to identify the skeleton that has a great impact on ROPS performance during lateral loading and further reduce the number of design variables,correlation analysis was carried out in the optimization design module of ANSYS Workbench.The adaptive single objective method is used to optimize the thickness of cab frame,and the optimal results are obtained,which meet the performance requirements,reduce the lateral load coefficient and reduce the frame mass obviously.The safety performance of the optimized cab ROPS&FOPS was verified by finite element analysis,and the load energy curve and load displacement curve of the lateral loading process before and after optimization were compared and analyzed,and the reliability of the optimized structure was verified.