基于盲数理论的萤火虫神经网络失效征候结构可靠度预测

发布时间：2017-12-26 16:20

本文关键词：基于盲数理论的萤火虫神经网络失效征候结构可靠度预测　出处：《中国机械工程》2017年15期 　论文类型：期刊论文

【摘要】：在任意可行性工况下,针对大型臂架失效征候结构的载荷效应与抗力的多种不确定因素导致结构可靠度难以确定的问题,通过构建盲数失效征候结构可靠度模型(BNFSSRM)、串行式萤火虫神经网络预测模型——缺陷结构远场应力预测子模型(STFNN-DSSSPSM)与缺陷结构可靠度预测子模型(STFNN-DSRPSM)串联,提出了基于盲数理论的萤火虫神经网络失效征候结构可靠度预测方法。以应力-强度干涉模型为基础,萤火虫神经网络为预测方法,根据裂纹失稳扩展准则,将不确定性问题盲数化的思想引入裂纹强度因子与断裂韧性的干涉模型,通过试验仿真与STFNN-DSSSPSM,得到典型工况下裂纹缺陷结构的可靠度;再以此为扩展样本的目标输出、裂纹扩展尺寸为扩展样本的输入,通过BNFSSRM、STFNN-DSRPSM,实时预测不同工况下缺陷结构的可靠度,评估抵抗失效的能力以及不同工况退出可行性工况域的先后顺序。以QY130流动式起重机再制造臂架结构为例,验证了该方法的有效性,为结构再制造准入期实时判断以及再制造方案的选择提供了理论指导。
[Abstract]:In any feasibility conditions for a variety of load effect of large arm failure symptom structure and resistance factors in structural reliability is difficult to determine, by constructing the blind number model of structural reliability failure symptom (BNFSSRM), serial firefly neural network forecasting model based on the defect structure of the far field stress prediction model (STFNN-DSSSPSM) and defect structure reliability prediction model (STFNN-DSRPSM) series, proposed a reliability prediction method of structure failure symptom of firefly neural network based on blind number theory. Based on stress strength interference model based on neural network prediction method for the firefly, according to the instability of crack extension criterion, the interference model uncertainty problem of blind number theory into the crack and fracture toughness test, through simulation and STFNN-DSSSPSM, get the typical working conditions of the crack structure and reliability; as a target output, the sample size of the crack extension extension sample input, through the BNFSSRM, STFNN-DSRPSM, real-time prediction of defect structure under different conditions of reliability, evaluation of the ability of resistance to failure and order of different conditions from domain feasibility condition. Taking the remanufacturing boom structure of QY130 mobile crane as an example, the effectiveness of the method is verified, which provides a theoretical guidance for real-time judgement of structural remanufacturing access period and remanufacturing scheme selection.
【作者单位】：太原科技大学机械工程学院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2013AA040203) “十二五”国家科技支撑计划资助项目(2011BAK06B05-05)
【分类号】：TB114.3;TH21
【正文快照】： 0引言结构失效征候是指结构缺陷并未造成失效事故的发生,但使结构安全存在潜在隐患,即失效事故发生的征兆。宏观裂纹这一特定失效征候的存在对工程机械承载结构的安全使用造成严重威胁。据不完全统计,由裂纹缺陷引起的事故损失每年可达数千亿元。实际环境中,由于经费不足、维

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