Lightweight helideck design method using topology optimization

摘要

The present invention relates to a method of designing a lightweight helideck utilizing a phase optimal design to reduce the design cost of the helideck. The optimal design method of an offshore plant structural member according to the present invention is a method of designing a structure supporting a landing pad of a helideck composed of a plurality of structural members by using at least one of constraint condition, A structural analysis step of calculating a structural member response to an external load through the finite element method in the initial design model using the following equation (1) Kz = F ... ... ... ... ... ... Formula ① A design sensitivity analysis step of numerically calculating the response sensitivity of the initial design model for each design variable after the structure analysis step using the following equation (2) ... ... ... ... ... ... Equation (2) A design change step of comparing the sensitivity of each structural member calculated by the design sensitivity analysis step with a set reference value to divide the major component and the removal target component to change the design; A design improvement confirmation step in which the design change step is redone from the structure analysis step when the design change is made; and a phase optimal design step of outputting an optimal design model when the structural member is unconfirmed through the design improvement confirmation step An initial member section determining step of determining a material of the optimum design model output through the phase optimal designing step and a size of an initial member cross section, A structural stress analysis step for analyzing the structural stress of the optimum design model and a structural stress analysis step Depending on the different analysis results is configured to include a step of changing cross-section member to reduce or enlarge a section of the member. According to the present invention, weight reduction of the helideck can be achieved while securing the structural stability by the effect of the weight reduction and the phase optimum design.