Physical Limitations for the Bandwidth Frequency of a Pressure Controlled, Axial-Piston Pump
Physical Limitations for the Bandwidth Frequency of a Pressure Controlled, Axial-Piston Pump
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DOI：
10.1115/1.4004056
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发表时间：
2011-11
影响因子：
1.7
通讯作者：
N. Manring;Viral Mehta
中科院分区：
文献类型：
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作者：
N. Manring;Viral Mehta
本文的目的是确定的设计参数，有最大的压力控制，轴向柱塞泵的带宽频率的影响。这项研究的动机是，在实践中已经观察到这些机器的物理限制，因为很难将带宽频率提高到25 Hz以上。虽然在过去的三十年里已经做了大量的研究来了解这些机器的动态行为，决定泵的带宽频率的基本设计特性仍然难以捉摸。在某种程度上，这是由于这样的事实，即机器是复杂的，并且当与液压控制阀耦合时，该液压控制阀被稳态和瞬态流体动量效应干扰，这种动态特性变得难以评估。为了实现本研究的目标，本文提出了最全面的泵和阀模型的压力控制，轴向活塞机在文献中的日期。泵模型包括作用在斜盘上的离散泵送元件的效果，而阀模型包括稳态和瞬态流体动量力。为了识别模型的主要特征，采用无量纲分析，并通过消除可忽略的项来降低模型的复杂性。此外，一个封闭形式的表达式的带宽频率和扰动分析用于识别的主要参数，影响的泵的带宽频率。总之，它表明，到目前为止，带宽频率的最大影响可以通过减少控制致动器的扫掠体积和通过增加控制阀的流量来实现。
The objectives of this paper are to identify the design parameters that have the greatest impact on the bandwidth frequency of a pressure controlled, axial-piston pump. This study is motivated by the fact that a physical limitation for these machines has been observed in practice, as it has been difficult to increase the bandwidth frequency much beyond 25 Hz. Though much research has been done over the past thirty years to understand the dynamical behavior of these machines, the essential design-characteristics that determine the bandwidth frequency of the pump remain elusive. In part, this is due to the fact that the machine is complex and when coupled with a hydraulic control valve that is disturbed by steady and transient fluid-momentum effects this dynamical property becomes difficult to assess. In order to achieve the objectives of this research, this paper presents the most comprehensive pump-and-valve model of a pressure controlled, axial-piston machine available in the literature to date. The pump model includes the effects of the discrete pumping-elements acting on the swash plate, while the valve model includes both steady and transient fluid-momentum forces. To identify the dominate features of the model, nondimensional analysis is employed and the complexity of the model is subsequently reduced by eliminating negligible terms. Furthermore, a closed-form expression for the bandwidth frequency is employed and perturbation analysis is used to identify the dominant set of parameters that impact the bandwidth frequency of the pump. In conclusion, it is shown that, by far, the greatest impact on the bandwidth frequency may be achieved by reducing the swept volume of the control actuator and by increasing the flow capacity of the control valve.