| The submarine micro drilling rig is a kind of high-efficiency drilling and sampling equipment suitable for deep-sea cobalt-rich crusts and polymetallic sulphides, and lightweight requirements are put forward for it in consideration of its operational form, submarine operating environment and the conditions of the equipment it carries. The chassis of the submarine micro drilling rig is both the key to carrying and the focus of light -weighting. To establish a drilling rig chassis model and carry out finite element static and dynamic characteristic analysis, based on the response surface method, the geometric dimensions of cross beams, longitudinal beams, and rightangle ribs are used as the design variables, and the sample data are constructed through the center-response composite experimental design to build up a fine response surface model of the chassis by combining with the Kriging interpolation. Optimized chassis mass, maximum deformation, and first-order intrinsic frequency are taken as objectives, and the yield limit of the material is not exceeded as a constraint, then the multi-objective genetic method is adopted to fulfill the multi-objective optimization solution. After optimization, the mass of the submarine micro drilling rig chassis has declined by 10.83% compared with the initial design, and the lightweight effect is obvious, which is of reference significance for the research of light-weighting of sea-related crawler chassis equipment. |
