Research On Safety Performance And Structure Optimization Of FOPS / ROPS Device In Engineering Cab

The safety protection structures of the engineering vehicle cab mainly include FOPS (falling-object protective structure) and ROPS (Roll-over protective structure). FOPS mainly contain two parts:top guard and front guard.In this paper, the research is supported by Torch Pragram (2012GH530716) and Yangzhou science and technology plan project-The key technology research and development of medium-sized excavators cab FOPS/ROPS security design and structure optimization. Based on a type of engineering vehicle cab FOPS/ROPS manufactured by Jiangsu benyu, this paper set a research on the safety performance study of FOPS/ROPS and the performance of FOPS is optimized. Including:Firstly, this paper reviews the research status of the engineering vehicle cab FOPS/ROPS. The main research methods, the type and main research problems of the safety protection structures are discussed.Secondly, according to the characteristics of the engineering vehicle cab FOPS/ROPS, the simulation that top guard is impacted by the falling hammer is made with the help of the finite element non-linear analysis software-HyperWorks and LS-DYNA, complying with GB/T19932-2005. The displacement curve of loading center is obtained and the breakage phenomenon is also researched. The stiffness of the top guard is so weak that the hammer’s displacement is too large, which leads to the impact resistance of top guard can’t meet the request of GB/T19932-2005. Based on this, the cause of the stiffness insufficient is researched. By orthogonal experimental design for the dominant factors, it makes the simulation performance of the top guard meet the requirements of the standard. On this basis, the simulation mechanical bearing capacity of the front guard is done by LS-DYNA and the displacement curve of front guard loading center is obtained. The deformation and stress distribution are researched. The performance of the front guard meets the request of GB/T19932-2005.Then, the safety performance of ROPS is researched by HyperWorks and LS-DYNA, complying with GB/T17922-1999. The loading sequence is lateral, vertical and longitudinal in turn. The displacement curve of loading center is obtained for each working condition. The deformation pattern and stress distribution are researched under each working condition. The performance of ROPS meets the request of GB/T17922-1999.At last, optimized FOPS is assembled with ROPS and the experimental study is accomplished at the engineering equipment test center of Jilin University. By contrasting the result of simulation and experiment, it turns that simulative result coincides with the experimental well. The correctnesses of the finite element model and the simulation results are verified. The certain error between simulation and experiment is discussed too.This paper makes a systematic study on mechanical properties simulation, top guard optimization and laboratory experimental study for the engineering vehicle cab FOPS/ROPS. Through the study, it provides certain theory reference and basis for safety performance design and optimization for FOPS/ROPS.