Reliability analysis of direct drive electrohydraulic servo valves based on a wear degradation process and individual differences
Reliability analysis of direct drive electrohydraulic servo valves based on a wear degradation process and individual differences
复制标题
基于磨损退化过程和个体差异的直驱电液伺服阀可靠性分析
DOI：
10.1177/1748006x14541256
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发表时间：
2014-07
期刊：
影响因子：
--
通讯作者：
Hong-Zhong Huang
中科院分区：
文献类型：
--
作者：
Weiwen Peng;Debiao Meng;Shun-Peng Zhu;Hong-Zhong Huang
电液伺服阀在现代伺服控制系统中起着至关重要的作用，要求高可靠性和高安全性。对一种直驱式电液伺服阀进行了可靠性分析。首先，通过分析直驱式电液伺服阀的结构和工作原理，研究了直驱式电液伺服阀的失效机理。结果表明，卡滞、内泄漏和弹簧疲劳是直驱式电液伺服阀的主要失效形式。磨损引起的结构退化增大了间隙，导致零泄漏量增加。然后，在失效机理分析的基础上，采用伽马过程来描述内部结构退化。通过在伽马过程退化模型中引入单元特性随机效应，研究和处理了直驱式电液伺服阀不同样本间的不均匀性。此外，在这篇文章中，贝叶斯方法被用来促进退化分析和可靠性估计。建立了密封、弹簧和滑阀的可靠性模型。最后，通过对直驱式电液伺服阀的试验研究和可靠性分析实例，说明了直驱式电液伺服阀的失效机理分析和可靠性分析方法。
Electrohydraulic servo valves play critical roles in modern servo control systems, which require high reliability and high safety. The reliability analysis of a direct drive electrohydraulic servo valve is conducted in this article. First, the failure mechanism of the direct drive electrohydraulic servo valve is investigated by analyzing the structure and the working principle of the direct drive electrohydraulic servo valve. It shows that clamping stagnation, internal leakages and spring fatigue are the main failure modes of direct drive electrohydraulic servo valve. The structure degradation caused by wear enlarges the clearance and results in the increase in null leakages. Then, a gamma process is adopted to describe the internal structure degradation based on the failure mechanism analysis. Heterogeneity among different samples of direct drive electrohydraulic servo valves is studied and handled by introducing unit-specific random effects into the gamma process degradation model. Additionally, in this article, a Bayesian method is used to facilitate the degradation analysis and reliability estimation. The reliability models of sealing, springs and spool valves are presented. Finally, a brief introduction of the experiment of the direct drive electrohydraulic servo valves and an illustrative example of reliability analysis are presented to demonstrate the introduced failure mechanism analysis and the proposed reliability analysis method for direct drive electrohydraulic servo valves.
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通讯作者：
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影响因子：
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DOI：
--
发表时间：
2009
期刊：
Machine Tool & Hydraulics
影响因子：
--
作者：
M. Ai-hong
通讯作者：
M. Ai-hong