Abstract
In this paper, an innovative solution to minimize noise emission, acting on the flow ripple, in a prototype External Gear Pump (EGP) is presented. Firstly, a new tool capable to completely simulate this pump’s typologies, called EgeMATor, is presented; the hydraulic model, adopted for the simulation, is based on a lumped parameter method using a control volume approach. Starting from the pump drawing, thanks to different subroutines developed in different environments interconnected, it is possible to analyze an EGP. Results have been compared with the outputs of a three-dimensional CFD numerical model built up using a commercial code, already used with success by the authors. In the second section, an innovative solution to reduce the flow ripple is implemented. This technology is called Alternative Capacitive Volumes (ACV) and works by controlling and uniformizing the reverse flow, performing a consistent reduction of flow non-uniformity amplitude. In particular, a high reduction of the flow non-uniformity is notable in the frequency domain on the second fundamental frequency. The technology is easy to accommodate in a pump housing, especially for high-pressure components, and it helps with reducing the fluid-borne noise.
Highlights
Nowadays, the scientific community considers it intolerable that millions of people suffer from unacceptable noise level emissions
EgeMATor, furtherfurther analysis is presented in Figure where19, thewhere numerical flow flow ripple comparison has been reported, for both time and frequency domains, among ripple comparison has been reported, for both time and frequency domains, among the initial standard pump
Two different approaches to simulate the fluid-dynamic of an External Gear Pump (EGP) have
Summary
The scientific community considers it intolerable that millions of people suffer from unacceptable noise level emissions. Every country is doing its best to conform to the more stringent regulations and policies regarding environmental noise emissions. Fluid power technology aims to keep noise limitation as low as possible for industrial and mobile applications. External gear pumps (EGPs) are widely used in fluid power since these pumps have many advantages, like compactness and low costs, relatively high efficiency and remarkable reliability, structural simplicity, and a wide range of operating conditions. Even if the working principle of the EGPs is straightforward, there are many studies available in the literature focused on their performance improvement. An EGP consists of a driving gear, connected to the pump’s shaft and a driven gear (Figure 1) [1,2]
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