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首页> 外文期刊>International Journal of Fluid Power >MEASURING AND MODELLING HYDRAULIC FLUID DYNAMICS AT HIGH PRESSURE - ACCURATE AND SIMPLE APPROACH
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MEASURING AND MODELLING HYDRAULIC FLUID DYNAMICS AT HIGH PRESSURE - ACCURATE AND SIMPLE APPROACH

机译：高压下液压流体动力学的测量和建模-精确而简单的方法

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Dynamic properties of hydraulic fluids have to be taken into account in ever increasing fluid power applications. The main reasons are increasing accuracy demands in control and modelling, as well as increasing operating pressure and temperature ranges. Moreover, the already wide spectrum of different hydraulic fluids is also expanding all the time. However, information on dynamic hydraulic fluid behavior is still very difficult to be obtained. On the other hand, existing fluid models tend to be either too inaccurate, or at least highly non-generic for most practical applications. This article introduces simple, yet accurate approaches for measuring and predicting the most important dynamic fluid parameters: bulk modulus, density and speed of sound in fluid. The methods are basically applicable to any standard hydraulic fluid, without any extra system-related constraints, at least at the presented conditions. The studied pressure range reaches 1500 bar, and the temperatures cover a normal operating range of industrial applications. Examples of both measured and predicted results for selected commercial hydraulic fluids are given. The results have also been found to be in excellent agreement with existing reference data.
机译：在不断增加的流体动力应用中，必须考虑液压流体的动态特性。主要原因是控制和建模对精度的要求提高，以及工作压力和温度范围的增大。此外，已经广泛存在的各种液压油也一直在扩展。但是，仍然很难获得有关动态液压流体行为的信息。另一方面，对于大多数实际应用，现有的流体模型往往过于不准确，或者至少是高度非通用的。本文介绍了用于测量和预测最重要的动态流体参数的简单而精确的方法：体积模量，密度和流体中的声速。该方法至少在当前条件下基本上适用于任何标准液压油，而没有任何与系统相关的额外约束。研究的压力范围达到1500 bar，并且温度涵盖了工业应用的正常运行范围。给出了选择的商用液压油的测量结果和预测结果的示例。还发现结果与现有参考数据非常吻合。

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