叶片振动的灰色可靠性研究

在叶片的实际振动中存在着大量部分已知、部分未知或信息不完全的灰色信息。借助灰色理论所需建模数据量较少 ,研究解决小样本、贫信息不确定问题的优点 ,将灰色理论与方法引入叶片的振动可靠性评估 ,提出了叶片振动的灰色可靠性概念 ,建立了叶片振动的灰色可靠性模型 ,并将其应用于实际叶片的振动可靠性研究。研究结果表明该法是可行的 。

灰色可靠性分析及其应用的研究

本文从可靠性技术出发 ,结合灰色系统的概念 ,对结构工程强度和寿命最佳设计问题 ,提出了灰色可靠性分析 ,有其实用价值 ,可供参考。

灰色可靠性设计在机械产品优选中的应用

通过灰色可靠性设计方法来完成系统的灰色建模、灰色聚类、灰色关联分析、灰色生成等信息加工手段,寻求机械系统内在和外在的规律,实现机械产品的评估优选。

基于灰色系统理论的机构可靠性分析

灰色理论所需建模数据量较少,为解决小样本、贫信息的不确定性问题,将灰色系统理论引入机构的运动可靠性评估.首先提出了机构的灰色可靠性概念,并建立了机构的灰色可靠性模型.然后从机构运动条件和运动精度的极限状态方程出发,推导了灰色可靠度计算公式,并应用于实际机构的可靠性分析.算例分析表明:机构灰色可靠性模型可行有效,所得结果可信.

Lifetime prediction for tantalum capacitors with multiple degradation measures and particle swarm optimization based grey model

A lifetime prediction method for high-reliability tantalum （Ta） capacitors was proposed, based on multiple degradation measures and grey model （GM）. For analyzing performance degradation data, a two-parameter model based on GM was developed. In order to improve the prediction accuracy of the two-parameter model, parameter selection based on particle swarm optimization （PSO） was used. Then, the new PSO-GM（1, 2, co） optimization model was constructed, which was validated experimentally by conducting an accelerated testing on the Ta capacitors. The experiments were conducted at three different stress levels of 85, 120, and 145℃. The results of two experiments were used in estimating the parameters. And the reliability of the Ta capacitors was estimated at the same stress conditions of the third experiment. The results indicate that the proposed method is valid and accurate.