Hybrid Methodology for Structural Health Monitoring Based on Immune Algorithms and Symbolic Time Series Analysis

This hybrid methodology for structural health monitoring (SHM) is based on immune algorithms (IAs) and symbolic time series analysis (STSA). Real-valued negative selection (RNS) is used to detect damage detection and adaptive immune clonal selection algorithm (AICSA) is used to localize and quantify the damage. Data symbolization by using STSA alleviates the effects of harmful noise in raw acceleration data. This paper explains the mathematical basis of STSA and the procedure of the hybrid methodology. It also describes the results of an simulation experiment on a five-story shear frame structure that indicated the hybrid strategy can efficiently and precisely detect, localize and quantify damage to civil engineering structures in the presence of measurement noise.

基于人工免疫系统的电路小样本故障诊断方法

针对常规电路故障诊断方法存在的故障样本需求大的问题,基于免疫系统的阴性选择机理,提出了建立人工免疫系统实现电路小样本故障诊断的新方法。该方法仅需电路正常模式测试数据加一组故障模式测试数据为样本,生成随机检测器,再运用变异实值否定选择算法优化随机检测器,结合基于故障样本生成故障类型检测器构成人工免疫系统的故障检测器,并采用二次匹配方法完成电路的故障诊断。对ITC’97的CTSV滤波器电路的故障诊断表明,该方法可应用于小故障样本场合下的电路故障诊断,具有较高的实际应用前景。

一种基于GA的新型生物地理学优化算法研究

为了使生物地理学优化算法的优化能力得到进一步提高,提出了一种基于遗传算法的新型生物地理学优化算法。在迁移操作之前增加了选择操作,采用了"轮盘赌"的方法选择出迁移个体,以使适应度较高的个体可以优先得到迁移,并且变异操作结合了遗传高斯变异操作方法,从而更好地提升了算法的优化性能;在此基础上,从理论上详细推导了该方法的收敛性条件。使用了5种测试函数进行实验,结果证明了改进后的算法在优化结果和收敛速度方面要更优。