本研究針對高效能軸向柱塞泵進行模擬分析，並將柱塞泵內零組件進行機構設計，目的在降低其出口流量脈動，增加軸向柱塞泵的流動穩定性，以達到低噪音、高效率之液壓系需求。軸向柱塞泵包含一個關鍵零組件-配流盤 (Valve Plate)，它的結構形式、尺寸、材料及加工精度合理與否，將直接影響柱塞泵的容積效率及泵內液壓油流動特性。由於柱塞泵運作過程中產生的壓力衝擊 (Pressure Impact)與流量脈動 (Flow Fluctuation)是導致液壓系統噪音的主要原因之一，而流量脈動為本研究的主軸並以流量脈動率 (Flow Fluctuation Rate)及相對標準偏差 (Coefficient of Variation)作為指標，理想情況下，流量脈動率及相對標準偏差表現越低，對軸向柱塞泵的效益越佳，所以在配流盤結構中，本研究會利用緩衝槽 (Buffer Grooves)、阻尼孔 (Damping Holes)設計與其所配合之預壓室 (Pre-compression Reservoir)設計進行分析，藉由分析結果可得知，配流盤結構改變後，柱塞泵出口流動脈動明顯改善許多，並將其設計做參數優化，期望計算後的流量脈動率與相對標準偏差更能有效降低，使得柱塞泵穩定輸出液壓油。為模擬軸向柱塞泵的循環動態流場性質，本研究利用商業計算流體力學軟體Fluent，而Fluent也為目前使用最廣泛的CFD (Computational Fluid Dynamic)軟體之一。

This study consists of simulated high efficient axial piston pump operations and is an attempt to decrease the flow fluctuation rate of the axial piston pump’s outlet. The operations of an axial piston pump can cause loud noises because interactions between solid structures and fluid in the pump create a pressure impact and flow fluctuations. This research is focused on the simulation of fluid dynamics in a pump and is an attempt to modify the pump design to reduce the flow fluctuation rate of the axial piston pump’s outlet. Special attention is paid to the influence of the valve plate on the flow fluctuation rate and on the coefficient of variation in the axial piston pump under consideration. It was found that the proper design of the valve plate in an axial piston pump will dramatically lower the flow fluctuation rate in the pump especially with regard to designs involving buffer grooves, damping holes and a pre-compression reservoir. Optimizing the design parameters is intended to determine the best performance indices. As to the simulation results, the design of the valve plate in this research significantly improved the flow fluctuation rate and coefficient of variation. In this research, Fluent CFD software was used to understand the flow characteristics of the piston pump’s outlet.

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