外文翻譯---液壓密封完整性調(diào)查研究-液壓系統(tǒng)(已修改)
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【正文】 機(jī)電 工程學(xué)院 機(jī)械系機(jī)械設(shè)計制造及其自動化班 學(xué)生 毛祖慶 畢業(yè)設(shè)計 第 1頁 共 13頁 井岡山大學(xué)外文翻譯用紙 Mechanical Systems and Signal Processing, 2020, 21: 1115–1126 A study of hydraulic seal integrity P. Chena, . Chua, . Lim Abstract: The work described in this paper involved online 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 evaluated 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 rootmeansquare (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 energybased 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 Modern water hydraulics, using tap water as the hydraulic fluid, has gained much interest in the past decade due to its inherent advantages pared to oil hydraulics. These advantages include environment friendliness, good product patibility and no fire hazards [1, 2]. However, some problems with modern water hydraulics are still to be addressed. One of the most mon problems is the relatively large internal leakage in water hydraulic ponents. For example, a water hydraulic cylinder could suffer from internal leakage across the piston seals. This is due to the very low viscosity of water in parison with that of hydraulic oil [1, 3]. Therefore, it is important to monitor the internal leakage to achieve optimal performance and reliable and safe operations of water hydraulic systems. The work presented in this paper is part of a project that aims to develop a quantitative model to estimate the internal leakage flow rate in a water hydraulic cylinder by means of AE. It is focused on the internal leakage smaller than L/min. In order to model the AE signal generated by the internal leakage, suitable parameters 機(jī)電 工程學(xué)院 機(jī)械系機(jī)械設(shè)計制造及其自動化班 學(xué)生 毛祖慶 畢業(yè)設(shè)計 第 2頁 共 13頁 井岡山大學(xué)外文翻譯用紙 must first be selected to interpret the signal. Therefore, experiments were conducted to study the characteristics of various AE parameters in terms of their effectiveness in estimating the internal leakage rate, as described in this paper. 2. Acoustic emission AE is defined as the transient elastic waves that are generated by the rapid release of energy from localised sources. It has been found that AE signals can be generated by fluid leakage. Pollock and Hsu [10] studied the physical origin of these signals in detail and Goodman et al. [12] reported a variety of AE source mechanisms associated with leakage from vessels, tanks and pipelines. In the case of internal leakage in water hydraulic cylinders, the generation of AE signals is largely attributed to the turbulence induced by the internal leakage. AE signals can be categorised into two basic types. The bursttype AE refers to AE signals corresponding to individual AE events, while the continuoustype AE refers to an apparently sustained signal level from rapidly occurring AE events [16]. AE signals generated by interna
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