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The development of the global marine industry led to a surge in demand for offshore platform crane, due to its complex working environment makes the research for offshore platform crane is less, So the strength calculation and modal analysis of the boom of the offshore platform crane are carried out by using ANSYS in this paper. Firstly, the load of the offshore platform crane is analyzed based on the API-2C specification; then the static analysis and modal analysis of the boom are carried out by using ANSYS and obtain the weak points, natural frequency and mode shapes of the components. The analytical results show that the material of boom meet the requirements of strength and stiffness; because the natural frequency of the winch drum and the fluctuating wind load and the boom is partially overlapped, we should pay attention to the speed of the winch drum or the structure reforming of the boom in order to avoid resonance in using.

Aiming at the problem of the optimization design on the hydraulic excavator boom, the research about the boom's comprehensive performances under the condition of bucket digging was put forward. A method of using the ISIGHT optimization platform to comprehensively integrate Pro/E and ANSYS was introduced to conduct a multi-objective collaborative optimization on boom. Adopted the hybrid optimization strategy of the combination between DOE and gradient optimization to intelligently explore the design issues, and continuously selected new initial values to conduct a automatically simulation and optimization. The results indicate that this method can use ISIGHT optimization software to automatically search the Pareto set to meet the boom's performance requirements, then gain the purpose of lightweight and vibration attenuation for boom, which provides some references for practical applications.