臺灣博碩士論文加值系統

在各種液壓泵中，軸向柱塞泵 (Axial Piston Pump)由於容積效率高、功率密度大、使用壽命長等獨特優點得到廣泛應用。在提升軸向柱塞泵性能同時，如何有效降低柱塞泵噪音成為重要研究課題。
本研究針對高效能軸向柱塞泵進行模擬分析，先對原始模型進行初步的模擬，透過文獻來驗證柱塞泵的初步流場模擬結果為正確的，再透過文獻搜索與資料瀏覽進行初步的幫浦設計，目的在降低其出口流量脈動、壓力脈動，進一步降低噪音值。
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，而流量脈動為與壓力脈動率為本研究的主軸，並以流量脈動率 (Flow Fluctuation Rate)及壓力脈動率 (Pressure Fluctuation Rate)作為指標，理想情況下，流量脈動率及壓力脈動率表現越低，對軸向柱塞泵的效益越佳，所以在柱塞泵結構中，本研究會利用緩衝槽 (Buffer Grooves)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與壓力脈動明顯改善許多，並將其設計做參數優化，期望計算後的流量脈動率與壓力脈動更能有效降低，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，與噪音分析軟體Virtual.lab來進行分析，從分析結果可以得知改善出口的流量脈動與壓力脈動，可以有效的降低因為流場不穩定所產生的噪音值。

This study consists of simulated high efficient axial piston pump operations. First of all, simulated the original pump. Secondly, search the literatures to design the original pump to reduce flow fluctuation rate, pressure fluctuation rate and acoustic power.
Valve plate was a key component of axial piston pump. Its structure, material and precision which are either reasonable or not will affect the reliability, volume efficiency and work life directly. The pressure impact and flow fluctuation were the main sources of noise in hydraulic system during the piston pump operating. This research focuses on the flow fluctuation rate and pressure fluctuation rate of the axial piston pump. It was found that the proper design of the valve plate in an axial piston pump will dramatically lower the flow fluctuation rate and pressure fluctuation rate in the pump especially with regard to designs involving buffer grooves 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 pressure fluctuation rate. In this research, Fluent CFD software was used to understand the flow characteristics of the piston pump’s outlet

目錄
摘要 I
Extended Abstract II
致謝 XIII
目錄 XV
表目錄 XVIII
圖目錄 XIX
符號說明 XXII
第一章、緒論 1
1-1研究背景與動機 1
1-2研究方法 2
1-3論文架構 2
第二章、液壓泵與文獻回顧 4
2-1液壓泵簡介 4
2-1-1 背景 4
2-1-2 液壓泵之特性 7
2-1-3 液壓泵種類與比較 8
2-1-4 液壓泵性能參數 15
2-2軸向柱塞泵介紹 17
2-2-1 軸向柱塞泵種類及工作原理 17
2-2-2 運動學分析 19
2-3文獻回顧 20
第三章、理論背景與模擬分析 27
3-1計算流體力學 27
3-1-1 有限體積法 27
3-1-2 統御方程式 29
3-1-3 紊流模型 30
3-1-4 壁面函數 32
3-1-5 CFD求解流程 33
3-2聲場分析理論 (Acoustic analysis) 33
3-2-1 邊界元素法(BEM)理論 34
3-2-2 LMS Virtual.Lab求解流程 38
3-3CFD模擬基本假設 39
3-4幾何模型 41
3-5網格處理 43
3-5-1 動態網格 44
3-6模擬參數 45
3-6-1 流場分析模擬參數 45
3-6-2 聲場分析模擬參數 47
3-7量化指標 48
第四章、模擬結果與討論 50
4-1原始軸向柱塞泵模擬結果 50
4-1-1 柱塞對泵體所產生之壓力脈動 50
4-1-2 柱塞缸體內之壓力變化 51
4-1-3 軸向柱塞出口流量變化 52
4-2軸向柱塞泵機構設計與優化分析 54
4-2-1 預壓室容積設計與分析 (V) 54
4-2-2 配流盤設計與分析 63
4-2-3 配流盤進階設計與分析 70
4-3綜合討論 72
第五章、結論與未來展望 74
5-1結論 74
5-2未來展望 75
參考文獻 76
索引 80

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