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  本文選題：壓電陶瓷 + 薄膜節(jié)流器��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：非圓曲面因具有改善潤滑,均布載荷,減小集中應(yīng)力,提高使用壽命等優(yōu)點,被廣泛應(yīng)用于高品質(zhì)零部件。然而,對非圓曲面的精密加工一直是現(xiàn)代制造技術(shù)中的關(guān)鍵難題,特別是對非圓內(nèi)孔的精密加工更具有挑戰(zhàn)性。本文設(shè)計了一種新型單面薄膜節(jié)流閥,用于靜壓主軸軸心軌跡的主動控制,為實現(xiàn)非圓內(nèi)曲面的精密加工提供新的加工方法。開展了徑向靜壓軸承的理論研究,推導(dǎo)了四油腔靜壓軸承的雷諾方程、流量連續(xù)方程等基礎(chǔ)方程,并給出了其計算方法。對比了有周向回油槽四油腔靜壓軸承與無周向回油槽四油腔靜壓軸承的結(jié)構(gòu)特點和壓力分布。使用簡化算法計算了有回油槽靜壓軸承的靜態(tài)特性,并通過算例驗證了其實用性。設(shè)計了一種壓電陶瓷致動器驅(qū)動的新型單面薄膜節(jié)流閥,分析了其工作原理和結(jié)構(gòu)優(yōu)勢,并建立了新型單面薄膜節(jié)流閥的理論模型。研究了其壓力和流量特性,給出了薄膜剛度的計算公式,進行了薄膜的受力分析。將新型單面薄膜節(jié)流閥結(jié)構(gòu)參數(shù)優(yōu)化設(shè)計問題從復(fù)雜的多目標(biāo)優(yōu)化簡化為單目標(biāo)非線性優(yōu)化問題,并使用matlab軟件的優(yōu)化工具箱中fmincon函數(shù)優(yōu)化設(shè)計了新型單面薄膜節(jié)流閥的結(jié)構(gòu)參數(shù)。介紹了兩種靜壓主軸主動控制液壓系統(tǒng)的設(shè)計方案,分別仿真了期望軸心軌跡與壓電陶瓷致動器輸出位移、推力之間的關(guān)系,并對兩種系統(tǒng)設(shè)計方案進行了對比分析。推導(dǎo)了靜壓軸承的剛度和阻尼求解方法,分析了主軸偏心率、供油壓力對靜壓軸承油膜剛度系數(shù)和油膜阻尼系數(shù)的影響。構(gòu)建了新型單面薄膜節(jié)流閥獨立控制的靜壓主軸系統(tǒng)的動力學(xué)模型,給出了系統(tǒng)傳遞函數(shù),并仿真了系統(tǒng)的階躍響應(yīng)。搭建了新型單面薄膜節(jié)流閥的實驗系統(tǒng)。實驗得出了壓電陶瓷致動器的靜態(tài)特性和遲滯特性,使用基于LM算法的BP神經(jīng)網(wǎng)絡(luò)模型預(yù)測了壓電陶瓷致動器的輸出位移。實驗得出了新型單面薄膜節(jié)流閥的動態(tài)響應(yīng)特性和流量特性,并擬合出了節(jié)流閥的流量公式。
[Abstract]:Non-circular surface is widely used in high quality parts because of its advantages of improving lubrication, distributing load, reducing concentration stress and increasing service life. However, the precision machining of non-circular surfaces has always been a key problem in modern manufacturing technology, especially for the precise machining of non-circular inner holes. In this paper, a new type of single-sided thin-film throttle valve is designed, which is used for the active control of the axial trajectory of the hydrostatic spindle, and provides a new machining method for the precision machining of the non-circular inner surface. The theoretical study of the radial hydrostatic bearing is carried out. The Reynolds equation and flow continuity equation of the four oil cavity hydrostatic bearing are derived and the calculation method is given. The structure characteristics and pressure distribution of the hydrostatic bearing with circumferential return tank and four oil chamber with no circumferential oil return groove are compared. The static characteristics of hydrostatic bearing with return tank are calculated by simplified algorithm, and its practicability is verified by an example. A new type of single-sided thin film throttle driven by piezoelectric ceramic actuator is designed, its working principle and structural advantages are analyzed, and the theoretical model of the new single-sided thin-film throttle valve is established. The pressure and flow characteristics of the film are studied, the calculation formula of the film stiffness is given, and the stress analysis of the film is carried out. In this paper, the problem of structural parameter optimization for a new type of single-sided thin-film throttle valve is simplified from complex multi-objective optimization to single-objective nonlinear optimization problem. Using the fmincon function in the optimization toolbox of matlab software, the structural parameters of a new type of one-sided thin-film throttle valve are optimized. This paper introduces two design schemes of hydrostatic spindle active control hydraulic system, simulates the relationship between the expected axis trajectory and the output displacement and thrust of the piezoelectric actuator, and makes a comparative analysis of the two design schemes. The stiffness and damping methods of hydrostatic bearing are derived, and the effects of spindle eccentricity and oil supply pressure on the film stiffness and damping coefficient of hydrostatic bearing are analyzed. The dynamic model of a new type of hydrostatic spindle system controlled independently by a single side thin film throttle valve is constructed. The system transfer function is given and the step response of the system is simulated. A new experimental system of single-sided film throttle valve is set up. The static and hysteresis characteristics of piezoelectric actuator are obtained experimentally. The output displacement of piezoelectric actuator is predicted by BP neural network model based on LM algorithm. The dynamic response characteristics and flow characteristics of a new type of single-sided thin-film throttle valve are obtained experimentally, and the flow formula of the throttle valve is fitted.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH137.522

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本文編號：2006405