液压密封完整性调查研究---外文翻译.doc

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液压密封完整性调查研究---外文翻译,abstract: the work described in this paper involved on-line detection of seal defects in a water hydraulic cylinder. an obvious effect of seal defect is interna...
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Abstract: The work described in this paper involved on-line detection of seal defects in a water hydraulic cylinder. An obvious effect of seal defect is internal leakage. Therefore, the approach used was to detect the internal leakage using suitable technique. The technique used involved detecting the acoustic emission (AE) due to the internal leakage. This paper eva luated various parameters of AE signals in terms of their capability in estimating the internal leakage rate in a water hydraulic cylinder. Experiments were carried out to study the characteristics of AE parameters at different internal leakage rates, the parameters including the root-mean-square (rms) value, the count rate, the peak magnitude of power spectral density and the energy. The correlations between these parameters and the internal leakage rate were analysed carefully. The results show that energy-based AE parameters, especially the rms value, are more suitable to interpret AE signals generated by internal leakage.
Keywords: Acoustic emission; Water hydraulic cylinder; Internal leakage; AE count rate; Root mean square; Power spectral density; AE energy
1. Introduction
摘要:本文中所涉及在液压缸的上线检测密封缺陷. 一个明显的影响密封的缺陷是内部泄漏。因此,所采用的办法是使用合适的技术探测内部泄漏. 所采用的技术涉及由于检测声发射( AE )内部泄漏.本文评估了AE信号的各种各样的参量,根据他们估计液压缸内部漏出率。 实验分析了AE参量不同的内部漏出率,参量包括根均方(rms)值,计数率、繁忙程度功率谱密度和能量的特征。分析了这些参量和内部漏出率之间的交互关系。 结果表示,基于能量的AE参量,特别是均方根值,是更加适当解释内部漏出引起的AE信号。
关键词:声发射;液压缸;内部泄漏;声发射计数率;均方根功率谱密度;AE能量

1 引言
现代水利使用自来水作为液压油,在过去几十年中,由于液压油其固有的优势相比。这些优势包括环境,友善,良好的产品兼容性,并没有发生火警的危险。但是,一些问题,与现代水力仍有待解决。其中最常见的问题是比较大的内部渗漏水液压元件。举例来说,一个水上液压缸可能遭受横跨活塞封印的内部漏出。这归结于非常低粘度的水力液压油。因此,重要的是要监测内部漏出以达到最佳性能和水液压机构的可靠和安全。
本文提出的是打算开发一个定量模型通过AE估计在水液压缸的内部漏出流速项目的一部分。它集中于内部漏出小于1.0 L /min。为了塑造AE发信号引起由内部漏出,适当的参量必须首先选择解释信号。所以,试验根据他们的在估计内部漏出率的有效率做了各种各样的AE参量的特征,正如本文所描述。