SELECTION OF OBJECTIVE FUNCTIONS AND APPLICATION OF GENETIC ALGORITHMS IN DAMPING DESIGN OF PIPE SYSTEM

• 来源期刊: 固体力学学报(英文版)
• 学科: 工学
• 年，卷（期）: 2003,（2）
• 页码范围: 171-178
• 页数: 8页
• 分类号: TB535.1
• 语种: 中文

摘要

The vibration failure of pipe system of aeroengine seriously influences the safetyof aircraft.Its damping design is determined by the selection of the design target,method andtheir feasibility.Five objective functions for the vibration design of a pipeline or pipe system areintroduced,namely,the frequency,amplitude,transfer ratio,curvature and deformation energyas options for the optimization process.The genetic algorithms(GA)are adopted as the opti-mization method,in which the selection of the adaptive genetic operators and the method ofimplementation of the GA process are crucial.The optimization procedure for all the above ob-jective functions is carried out using GA on the basis of finite element software-MSC/NASTRAN.The optimal solutions of these functions and the stress distribution on the structure are calculatedand compared through an example,and their characteristics are analyzed.Finally we put forwardtwo new objective functions,curvature and deformation energy for pipe system optimization.Thecalculations show that using the curvature as the objective function can reflect the case of minimalstress,and the optimization results using the deformation energy represent lesser and more uni-form stress distribution.The calculation results and process showed that the genetic algorithmscan effectively implement damping design of engine pipelines and satisfy the efficient engineeringdesign requirement.