基于动强度可靠性的输流管道动力优化设计
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摘要
建立以支撑(位置、刚度)和截面几何特性为设计变量,以结构重量极小化为目标,以动强度可靠性指标和固有频率为约束的管道动力优化模型。针对某类管道,对支撑位置、刚度和管径进行优化分析,得到了支撑、截面参数和管道动力特性之间的关系。计算结果表明此优化方式是合理有效的。经过优化,提高了首超可靠度,减轻了结构重量,降低了动应力,增强了管道的抗振能力。
Aim.The introduction of the full paper reviews a number of relevant papers in the open literature,points out what we believe to be their shortcomings,and then proposes the design mentioned in the title,which we believe is new and better than previous ones and which is presented in sections 1 through 3.Their core consists of: "A dynamic optimized model of pipeline under constraints on dynamic strength reliability and on natural frequency was established,where the support(location,stiffness) and cross-sectional dimensions were taken as design variables and the structural weight was considered as the objective function.The support's location,stiffness,external diameter and wall thickness of a certain type of pipeline were analyzed and optimized.And the relationship between the design variables and the dynamic characteristics of the pipeline was also presented." Simulation results,presented in Figs.4 through 6 and Tables 2 and 3,and their analysis show preliminarily that the optimized design based on dynamic strength reliability of the pipeline proposed in this paper is indeed better.And the optimized pipeline has higher reliability based on the first passage principle,smaller structure weight,less dynamic stress and better vibration suppression capability.
Aim.The introduction of the full paper reviews a number of relevant papers in the open literature,points out what we believe to be their shortcomings,and then proposes the design mentioned in the title,which we believe is new and better than previous ones and which is presented in sections 1 through 3.Their core consists of: "A dynamic optimized model of pipeline under constraints on dynamic strength reliability and on natural frequency was established,where the support(location,stiffness) and cross-sectional dimensions were taken as design variables and the structural weight was considered as the objective function.The support's location,stiffness,external diameter and wall thickness of a certain type of pipeline were analyzed and optimized.And the relationship between the design variables and the dynamic characteristics of the pipeline was also presented." Simulation results,presented in Figs.4 through 6 and Tables 2 and 3,and their analysis show preliminarily that the optimized design based on dynamic strength reliability of the pipeline proposed in this paper is indeed better.And the optimized pipeline has higher reliability based on the first passage principle,smaller structure weight,less dynamic stress and better vibration suppression capability.
引文
[1]Kang Z,Luo Y J.Non-Probabilistic Reliability-Based Topology Optimization of Geometrically Nonlinear Structures Using ConvexModels.Computer Methods in Applied Mechanics abd Engineering,2009,198:3228～3238
[2]Li Z J,Liao H T,Coit D W.A Two-Stage Approach for Multi-Objective Decision Making with Applications to System ReliabilityOptimization.Reliability Engineering and System Safety,2009,94:1585～1592
[3]Jensen H A,Valdebenito M A,Schuller G I.An Efficient Reliability-Based Optimization Scheme for Uncertain Linear SystemsSubject to General Gaussian Excitation.Computer Methods in Applied Mechanics and Engineering,2008,198:72～87
[4]Jensen H A,Valdebenito M A,Schuller G I,et al.Reliability-Based Optimization of Stochastic Systems Using Line Search.Computer Methods in Applied Mechanics and Engineering,2009,198:3915～3924
[5]Valdebenito M A,Schuller G I.Reliability-Based Optimization Considering Design Variables of Discrete Size.EngineeringStructures,2010,32:2919～2930
[6]Eamon C,Rais-Rohani M.Integrated Reliability and Sizing Optimization of a Large Composite Structure.Marine Structures,2009,22:315～334
[7]Mínguez R,Castillo E.Reliability-Based Optimization in Engineering Using Decomposition Techniques and FORMS.StructuralSafety,2009,31:214～223
[8]António C C,Hoffbauer L N.An Approach for Reliability-Based Robust Design Optimization of Angle-Ply Composites.Compos-ite Structures,2009,90:53～59
[9]Hiramoto K,Doki H.Simultaneous Optimal Design of Structural and Control Systems for Cantilevered Pipes Conveying Fluid.Journal of Sound and Vibration,2004,274:685～699
[10]Liu S P.Remaining Life Assessment and Optimal Design of Statically Indeterminate Pipe System with Circumferential Crack.In-ternational Communications in Heat and Mass Transfer,2010,37:266～273
[11]Lin Y H,Huang R C,Chu C L.Optimal Modal Vibration Suppression of a Fluid-Conveying Pipe with a Divergent Mode.Journalof Sound and Vibration,2004,271:577～597
[12]Zhai H B,Li B H,Jiang Z F,et al.Supports’Dynamical Optimized Design for the External Pipeline of Aircraft Engine.Ad-vanced Materials Research,2010,139-141:2456～2459
[13]李桂青,曹洪等.结构动力可靠性理论及其应用.北京:地震出版社,1993Li Guiqing,Cao Hong,et al.Structural Dynamic Reliability Theory and Application.Bejing:Earthquake Press,1993(in Chi-nese)
[2]Li Z J,Liao H T,Coit D W.A Two-Stage Approach for Multi-Objective Decision Making with Applications to System ReliabilityOptimization.Reliability Engineering and System Safety,2009,94:1585～1592
[3]Jensen H A,Valdebenito M A,Schuller G I.An Efficient Reliability-Based Optimization Scheme for Uncertain Linear SystemsSubject to General Gaussian Excitation.Computer Methods in Applied Mechanics and Engineering,2008,198:72～87
[4]Jensen H A,Valdebenito M A,Schuller G I,et al.Reliability-Based Optimization of Stochastic Systems Using Line Search.Computer Methods in Applied Mechanics and Engineering,2009,198:3915～3924
[5]Valdebenito M A,Schuller G I.Reliability-Based Optimization Considering Design Variables of Discrete Size.EngineeringStructures,2010,32:2919～2930
[6]Eamon C,Rais-Rohani M.Integrated Reliability and Sizing Optimization of a Large Composite Structure.Marine Structures,2009,22:315～334
[7]Mínguez R,Castillo E.Reliability-Based Optimization in Engineering Using Decomposition Techniques and FORMS.StructuralSafety,2009,31:214～223
[8]António C C,Hoffbauer L N.An Approach for Reliability-Based Robust Design Optimization of Angle-Ply Composites.Compos-ite Structures,2009,90:53～59
[9]Hiramoto K,Doki H.Simultaneous Optimal Design of Structural and Control Systems for Cantilevered Pipes Conveying Fluid.Journal of Sound and Vibration,2004,274:685～699
[10]Liu S P.Remaining Life Assessment and Optimal Design of Statically Indeterminate Pipe System with Circumferential Crack.In-ternational Communications in Heat and Mass Transfer,2010,37:266～273
[11]Lin Y H,Huang R C,Chu C L.Optimal Modal Vibration Suppression of a Fluid-Conveying Pipe with a Divergent Mode.Journalof Sound and Vibration,2004,271:577～597
[12]Zhai H B,Li B H,Jiang Z F,et al.Supports’Dynamical Optimized Design for the External Pipeline of Aircraft Engine.Ad-vanced Materials Research,2010,139-141:2456～2459
[13]李桂青,曹洪等.结构动力可靠性理论及其应用.北京:地震出版社,1993Li Guiqing,Cao Hong,et al.Structural Dynamic Reliability Theory and Application.Bejing:Earthquake Press,1993(in Chi-nese)
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