变粘度条件下静压支承滑靴副的研究

本文对变粘度条件下的静压支承滑靴副进行了一定的理论研究和分析，通过计算机仿真，得出了滑靴副泄漏流量和支承反力不仅与中心油室压力有关，而且还与流体的粘温系数、粘压系数、密度和比热容等有关的结论，为高速高压轴向柱塞泵的设计提供了一定的理论依据。     

静压支承球铰副支承反力的求解

提出了一种基于静压支承原理的球铰副的设计方法,并对该摩擦副油膜支承反力进行了求解,为高速高压轴向柱塞泵的设计提供了一定的理论依据。     

静压支承球铰副动态仿真研究

建立了基于静压支承设计的球铰副和滑靴副油膜运动数学模型,运用计算机进行了动态仿真,并对仿真结果进行了较为深入的分析,为设计高速高压轴向柱塞泵奠定了一定的理论基础。     

海水淡化轴向柱塞泵滑靴副的结构设计

由于采用黏度比液压油低得多的海水进行润滑,海水淡化轴向柱塞泵滑靴副的结构设计方法需要在油压轴向柱塞泵的基础上进行修正.采用剩余压紧力法进行设计时剩余压紧系数的选取比油泵要小,采用完全平衡法进行设计时,通过分析得出可变阻尼区流动一般处于层流状态,而固定阻尼区的流动一般处于湍流状态,导致固定阻尼的压力一流量特性发生变化,可使得细长孔阻尼的长度大为减小,静压支承液膜刚度理论不再成立.     

水液压柱塞泵中静压支承设计方法的理论研究

静压支承结构在水液压柱塞泵中起着重要作用,滑靴摩擦副和配流盘摩擦副是柱塞泵中典型的静压支承结构。目前静压支承的流场计算主要有两种方法,选择方法的依据主要是看哪种方法更加准确。不可压缩粘性流体的动量平衡方程(Naver-Stokes方程)是推导流场计算方法的基础,以此为依据进行严密的数学推演,可以得到与物理意义相吻合的流场设计方法。     

柱塞泵平面配流副支承力特性试验研究

根据平面静压支承原理,推导柱塞泵平面配流副的支承力平衡方程,结合试验结果研究影响支承力大小的因素和改善支承特性的措施.结果表明,供油压力、转速等工况参数对支承力的影响很大.     

水压轴向柱塞泵流量脉动动态仿真

流量脉动是影响水压轴向柱塞泵性能的重要因素之一。文章运用CFD仿真技术对引起水压轴向柱塞泵流量脉动的配流过程进行了可视化分析，得到了不同转速和负载下的流量脉动率，为水压泵的研究开发提供了参考。     

变粘度条件下静压止推轴承温升的研究

对静压支承中的静压止推轴承、静压滑环等液压元件的简化模型--旋转对称环形密封缝隙进行了深入研究,探讨了这种缝隙中油液粘度在变粘度条件下的分布规律,在此基础上推导出了环形静压支承进口和出口油液的温升计算公式,得出了有意义的结论,为设计出结构合理、性能优良的液体静压支承提供了理论依据.     

关于柱塞泵中滑靴静压支承适应性问题的探讨

在以前的闭式轴向柱塞泵中的柱塞与滑靴大部分采用静压支承设计法,而静压支承中必须有一个定阻尼,一个变阻尼,方能达到支承的目的,由于定阻尼的存在,就给支承在滑靴处有一个频率适应性问题,本文着重讨论此问题。     

新型静压平衡滑靴副及其在水液压泵中的应用研究

滑靴与斜盘摩擦副是柱塞泵的一对重要摩擦副，尤其是在水液压泵中，它的设计难度更大，文章在分析传统滑靴结构的基础上，提出了一种新型螺旋槽静压平衡滑靴，克服了静压支承滑靴易堵塞，难加工的缺点，可以有效改善水液压柱塞泵的滑靴寿命和可靠性。     

水压轴向柱塞泵滑靴静压支承分析与计算

如果设计不合理，水的低粘度将使得水压泵滑靴静压支承的泄漏流量极其严重，导致滑靴几乎不能正常工作，于是对其设计计算提出了新的要求，利用滑靴支承面与柱塞头之间的短节流小孔来补偿细长阻尼孔的节流作用，对滑靴结构参数和性能参数进行了详细的分析与计算，为滑靴的设计提供了一定的参考依据，讨论了温度对支承性能的影响。     

考虑黏-温特性对柱塞泵空化射流的影响

黏度是液压油的基本属性之一,其值对温度变化非常敏感,而温度又是影响油液发生空化的直接因素之一,因此为研究油液的实时黏-温特性对轴向柱塞泵空化效应的影响,利用流体仿真分析软件PumpLinx建立了包括湍流模型、全空化模型等条件在内的轴向柱塞泵动态CFD模型;并在考虑配流副间隙、柱塞副间隙和滑靴副间隙基础上,通过分析对比黏度恒定和实时黏-温变化两种条件下柱塞泵温度场、速度场和气体体积分数等因素,分析了黏-温特性对轴向柱塞泵内空化效应的实时影响。结果表明:与黏度为定值相比,在实时黏-温条件下柱塞泵空化效应更加剧烈,研究过程中所建立的仿真模型为后续的优化设计提供了一定的指导。     

NOISE IDENTIFICATION FOR HYDRAULIC AXIAL PISTON PUMP BASED ON ARTIFICIAL NEURAL NETWORKS

The noise identification model of the neural networks is established for the 63SCY14-1B hydraulic axial piston pump. Taking four kinds of different port plates as instances, the noise identification is successfully carried out for hydraulic axial piston pump based on experiments with the MATLAB and the toolbox of neural networks. The operating pressure, the flow rate of hydraulic axial piston pump, the temperature of hydraulic oil, and bulk modulus of hydraulic oil are the main parameters having influences on the noise of hydraulic axial piston pump. These four parameters are used as inputs of neural networks, and experimental data of the noise are used as outputs of neural networks. Error of noise identification is less than 1% after the neural networks have been trained. The results show that the noise identification of hydraulic axial piston pump is feasible and reliable by using artificial neural networks. The method of noise identification with neural networks is also creative one of noise theoretical research for hydraulic axial piston pump.     

水压轴向柱塞泵的阶梯浅腔滑靴

为了改善水压轴向柱寒泵滑靴的静压支承性能，提出了一种利用动静压混合润滑的阶梯浅腔滑靴结构，并就其结构尺寸和支承性能与普通的滑靴结构型式进行了比较和相应的计算，发现其支承性能有所提高。     

Tribological study on hydrostatic slipper bearing with annular orifice damper for water hydraulic axial piston motor

Hydrostatic slipper bearing is an effective way to maintain a fluid film between slipper pad and swash plate that slide against each other, and thereby mitigate direct surface-to-surface contact in water hydraulic axial piston motor (WHAPM). The hydrostatic slipper bearing with an annular orifice damper is proposed, and the reaction force of the bearing in WHAPM is investigated. The effects from the friction within the cylinder bore, the dynamics of the piston, and the centrifugal force of the piston–slipper assembly are examined. The characteristic equation of the hydrostatic slipper bearing with an annular orifice damper is formulated, where the effects of various geometric parameters (e.g. damping length, supporting length, and clearance between the piston and the cylinder bore) are reflected. The relevant criterion for designing the hydrostatic slipper bearing can then be established. Results of the theoretical analyses indicate that (a) the friction coefficient, the swash plate angle, and the inertia and centrifugal loads (generated under a high motor rotating speed) would have significant influences on the reaction force; (b) an appropriate swash plate angle can help eliminate the fluctuation of the reaction force; (c) the load-carrying capacity of the hydrostatic slipper bearing is more sensitive to the damping length than to the supporting length of the piston; (d) a short damping length can help enhance the load-carrying capacity; (e) a small clearance between the piston and the cylinder bore would help improve the adaptive ability to the varying load for the hydrostatic slipper bearing, when clearance between the slipper pad and the swash plate ranges from 5 to 20 μm. Experimental studies of the slipper pads sliding against the swash plates are conducted at a custom-manufactured test apparatus, given different material combinations and design methods. The experimental results indicate that the hydrostatic slipper bearing with an annular orifice damper would decrease the possibility of the severe wear between the slipper pad and the swash plate in comparison with the hydrostatic clamping ratio bearing in the WHAPM, and the CRA laser cladding (compared to the ZrO₂·MgO-plasma-sprayed coating and the stainless steel 2Cr13) is a promising candidate as the tribo-material when sliding against composite materials in water lubrication system. The hydrostatic slipper bearing with an annular orifice damper has been successfully applied to a WHAPM developed at the Huazhong University Science and Technology. The result demonstrates that the developed bearing has a satisfactory tribolgical performance, and can be extended to the manufacture of water hydraulic axial piston pumps.     

油液黏度对柱塞泵流动特性影响规律的研究

为分析油液的黏度对柱塞泵流动特性的影响,运用Fluent流场仿真软件对轴向柱塞泵的运动特性进行模拟。对比分析了不考虑油液黏性、考虑黏温与考虑黏压模型下柱塞泵的流动特性,仿真结果表明:油液的黏温模型对柱塞泵的流动特性影响较大,黏温模型下泵的泄漏较黏压模型增大0.7倍,黏度模型对柱塞泵的压力冲击无影响。模型的准确性得到了实验验证,为建立较为准确的柱塞泵动力学模型,以及研究其效率的影响机理提供技术支持。     

轴向柱塞泵低气压运行特性建模与试验分析

空化是影响液压系统动态特性的重要因素,为此开展了轴向柱塞泵低压环境下的工况研究。考虑气液两相混合油液的密度、体积弹性模量和黏度的影响,限制入口油腔的最低压力,建立轴向柱塞泵的压力流量模型,计算获得轴向柱塞泵在不同工况下的流量特性,并通过试验验证。研究表明:负载增大导致更严重的空化以及泄漏,并使容积效率降低;轴向柱塞泵在达到临界流量之后,转速提升只会加剧空化,而不能提升流量;最大容积效率出现在临界流量产生之前。为轴向柱塞泵低气压性能预测提供了理论支撑。     

Simultaneous temperature measurements of bearing and seal parts of a swash plate type axial piston pump — effects of piston clearance and fluid property

Temperatures of three bearing and seal parts of a swash plate type axial piston pump were measured simultaneously using a slip ring with thermocouples’ amplifiers. The rotating cylinder block had five thermocouples, the swash-plate had four, and the valve-plate had four. Three sets of pistons with different diameters were prepared. Hydraulic mineral oil with VG22 and a water-glycol type hydraulic oil with VG32 were used as test fluids. The maximum discharge pressure was 20 MPa; the maximum rotational speed was 25 rps. The inlet oil temperature was 20–40°C. Temperatures and temperature differences between the bottom-dead-center and the top-dead-center increased concomitantly with the discharge pressure. For larger piston clearance ratios, the temperatures rose monotonically. The bearing and seal parts were markedly hotter than the discharge oil. Temperatures rose much less using the water-glycol type oil than when using the mineral oil.