参数优化支持向量机的密封电子设备多余物定位方法研究

Research on localization method of loose particles inside sealed electronic equipment based on parameter-optimized support vector machine

在密封电子设备的生产制造过程中,对多余物进行检测和定位至关重要。针对设备体积大和多余物位置难以确定的问题,使用参数优化支持向量机对设备内部的多余物进行定位。通过设计信号调理电路与多通道信号同步采集电路,调理和采集微弱的多余物信号,设计两级双门限脉冲提取算法和多通道脉冲匹配算法对信号进行预处理,得到有效的信号数据。提取和选择性能优良的时频域特征构建定位数据集,比较不同分类算法在数据集上的性能表现,对更优的支持向量机进行参数优化设计,将优化后的支持向量机定位模型用于实物测试。测试结果表明,参数优化支持向量机的定位模型在航天电源内部的多余物定位测试的平均精度达82.58%,定位模型的泛化能力良好,达到航天系统工程的精度要求,该方法理论上可以推广应用于类似产生机理的碰撞信号定位。

In the manufacturing process of sealed electronic equipment,it is very important to detect and locate loose particles.Aiming at the problem of the large size of the equipment and the difficulty of determining the location of loose particles,parameter optimization Support Vector machines is used to locate the loose particle inside equipment.By designing a signal conditioning circuit and a multi-channel signal synchronization acquisition circuit,the weak loose particle signal is processed and collected.By designing a two-stage dual-threshold pulse extraction algorithm and a multi-channel pulse matching algorithm,the signals are preprocessed to obtain effective signal data.By extracting and selecting the time domain and frequency domain features with excellent performance,to construct a locating data set.Comparing the performance of different classification algorithms on the data set,optimizing the inherent parameters of better-performed support vector machine.And finally using the optimized support vector machine locating model for physical testing.The test results show that the optimized support vector machine locating model has an average accuracy of 82.58%in the loose particle locating test inside the aerospace power supply.The generalization ability of the locating model is good and meets the accuracy requirements of aerospace system engineering.Theoretically,this method can be extended to the research on the location of collision signals with similar generation mechanism.