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提出一种有别于常规阀配流泵的"斜盘转动而缸体不动"而采用缸体和配流阀一起旋转的双斜盘阀配流轴向柱塞式液压电机泵。建立该泵配流机构的数学模型,研究各种结构参数和工作参数对配流特性的影响,尤其是配流阀芯所受离心力对配流特性的影响。以仿真模型和得出的单个柱塞腔的压力响应曲线和输出流量曲线为基础,研究该类型泵流量脉动和侧向力脉动的特点,得出随着泵的工作转速增加,流量脉动和侧向力脉动都增大,当柱塞数量足够多时,柱塞数量的奇偶性在影响流量脉动上没有明显的区别,偶数个柱塞比奇数个柱塞产生的侧向力脉动要大。提出一种新型的阀配流轴向柱塞泵的变量调节方式,并研究该变量方式的原理和调节特性。样机泵的试验结果表明该泵的工作原理可行,进而展望双斜盘阀配流轴向柱塞式液压电机泵的应用前景。 相似文献
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水液压柱塞泵是水液压系统的关键元件,由于水介质的理化特性差异导致其泄漏、摩擦磨损、腐蚀、气蚀等现象比油压柱塞泵严重,为解决传统斜盘式水液压柱塞泵流量脉动大的问题,提出了一种新型的直线电机驱动水液压柱塞泵结构。通过研究恒流量直线电机驱动柱塞泵的可行运动规划,选取了直线电机以三角波间隔T/4相位差的运动方案,以实现双直线电机双作用水压柱塞泵实际输出较小的流量脉动。应用AMESim软件,构建了两种不同配流方式的双直线电机双作用柱塞泵系统的仿真模型。仿真发现,柱塞配流电机柱塞泵相比阀配流,其压力和流量脉动很小,其压力脉动幅度小于2%,流量脉动率仅为0.008。 相似文献
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以CY14-1B型斜盘式轴向柱塞泵为研究对象,分析柱塞泵结构原理与柱塞运动规律,建立柱塞泵流量数学模型。利用MSC.EASY5软件搭建柱塞泵液压虚拟样机模型,进行流量仿真计算,与液压试验台测试结果对比,验证模型的准确性。在此基础上,仿真计算不同斜盘倾角、不同内泄量情况下柱塞泵流量特性曲线,仿真模拟结果与理论分析及实际情况基本一致。结果表明:应用EASY5软件可以准确有效的实现柱塞泵建模和仿真,为进一步研究柱塞泵故障诊断提供参考,对复杂液压元件虚拟样机建模具有借鉴意义。 相似文献
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《机械工程学报(英文版)》2015,(5)
The current research about the flow ripple of axial piston pump mainly focuses on the effect of the structure of parts on the flow ripple. Therein, the structure of parts are usually designed and optimized at rated working conditions. However, the pump usually has to work in large-scale and time-variant working conditions. Therefore, the flow ripple characteristics of pump and analysis for its test accuracy with respect to variant steady-state conditions and transient conditions in a wide range of operating parameters are focused in this paper. First, a simulation model has been constructed, which takes the kinematics of oil film within friction pairs into account for higher accuracy. Afterwards, a test bed which adopts Secondary Source Method is built to verify the model. The simulation and tests results show that the angular position of the piston, corresponding to the position where the peak flow ripple is produced, varies with the different pressure. The pulsating amplitude and pulsation rate of flow ripple increase with the rise of pressure and the variation rate of pressure. For the pump working at a constant speed, the flow pulsation rate decreases dramatically with the increasing speed when the speed is less than 27.78% of the maximum speed, subsequently presents a small decrease tendency with the speed further increasing. With the rise of the variation rate of speed, the pulsating amplitude and pulsation rate of flow ripple increase. As the swash plate angle augments, the pulsating amplitude of flow ripple increases, nevertheless the flow pulsation rate decreases. In contrast with the effect of the variation of pressure, the test accuracy of flow ripple is more sensitive to the variation of speed. It makes the test accuracy above 96.20% available for the pulsating amplitude of pressure deviating within a range of ?6% from the mean pressure. However, with a variation of speed deviating within a range of ?2% from the mean speed, the attainable test accuracy of flow ripple is above 93.07%. The model constructed in this research proposes a method to determine the flow ripple characteristics of pump and its attainable test accuracy under the large-scale and time-variant working conditions. Meanwhile, a discussion about the variation of flow ripple and its obtainable test accuracy with the conditions of the pump working in wide operating ranges is given as well. 相似文献
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分析了恒压式轴向柱塞泵的运动特性和流动特性,建立了运动特性和流动特性的数学模型,在Simulation X软件中建立了恒压式轴向柱塞泵的参数化虚拟样机模型,并进行仿真运算,通过分析仿真结果,实现了对柱塞泵压力脉动及其冲击的预测分析.以力士乐A10VSO45恒压泵为试验对象进行动态试验研究,测量泵在不同条件下的压力变化和压力脉动,得出试验结果曲线,验证了仿真结果的正确性. 相似文献
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针对传统往复泵结构复杂、流量波动较大、凸轮驱动往复泵寿命短等问题,提出了一种凸轮和齿扇齿条复合驱动的新型往复泵,凸轮机构和齿扇齿条机构的交替工作驱动该往复泵的活塞做往复运动,使活塞呈现匀加速—匀速—匀减速的运动规律。建立了活塞的运动方程,并以三缸往复泵为例分析了往复泵的流量特性和相位误差角对流量脉动的影响,建立了凸轮和齿扇齿条复合驱动的三缸往复泵的动力学仿真模型,讨论了液力端载荷作用下活塞的运动特性。研究结果表明:凸轮和齿扇齿条复合驱动的三缸往复泵的流量脉动率仅为1.68%,已经达到曲柄滑块机构往复泵有空气包作用时的效果;相位误差对流量脉动存在一定影响,其大小应控制在±30′以内。仿真结果验证了所提出的凸轮和齿扇齿条复合驱动的新型往复泵的合理性与可行性。 相似文献
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Flow Ripple of Axial Piston Pump with Computational Fluid Dynamic Simulation Using Compressible Hydraulic Oil 总被引:1,自引:1,他引:0
MA Ji'en XU Bing ZHANG Bin YANG Huayong 《机械工程学报(英文版)》2010,23(1):45-52
The flow ripple, which is the source of noise in an axial piston pump, is widely studied today with the computational fluid dynamic(CFD) technology development. In the traditional CFD modeling, the fluid compressibility, which strongly influences the accuracy of the flow ripple simulation results, is often neglected. So a compressible sub-model was added with user defined function(UDF) in the CFD model to predict the flow ripple. At the same time, a test rig of flow ripple was built to study the validity of simulation. The flow ripple of pump was tested with different working parameters, including the rotation speed and the working pressure. The comparisons with experimental results show that the validity of the CFD model with compressible hydraulic oil is acceptable in analyzing the flow ripple characteristics. In this paper, the improved CFD model increases the accuracy of flow ripple rate to about one-magnitude order. Therefore, the compressible model of hydraulic oil is necessary in the flow ripple investigation of CFD simulation. The compressibility of hydraulic oil has significant effect on flow ripple, and the compression ripple takes about 88% of the total flow ripple of pump. Leakage ripple has the lowest proportion of about 4%, and geometrical ripple leakage ripple takes the remnant 8%. Besides, the influence of working parameters was investigated through the CFD simulations and experimental measurements. Comparison results show that the amplitude of flow ripple grows with the increasing of rotation speed and working pressure, and the flow ripple rate is independent of the rotation speed. However, flow ripple rate of piston pump grows with the increasing of working pressure, because the leakage ripple will increase with the pressure growing. The investigation on flow ripple of an axial piston pump using compressible hydraulic oil provides a more validity simulation model for the CFD analyzing and is beneficial to further understanding of the flow ripple characteristics in an axial piston pump. 相似文献
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针对四配流窗口轴向柱塞马达实验成本高、研发周期长,提出了建立四配流窗口轴向柱塞马达虚拟样机仿真实验方法。首先利用RecurDyn和AMESim软件建立四配流窗口轴向柱塞马达的3D动力学模型和1D液压系统模型;利用ANSYS软件,对四配流窗口轴向柱塞马达部分几何模型进行模态求解,生成四配流窗口轴向柱塞马达模态柔性体(R-Flex)多柔体动力学模型;利用RecurDyn和AMESim软件间接口技术,实时传递与共享机械系统模型和液压系统模型间的关键参数信息,完成虚拟样机模型构建;最后通过动力学求解,得到四配流窗口轴向柱塞马达在不同工况下的动态应力应变,实现四配流窗口轴向柱塞马达虚拟样机仿真实验。为四配流窗口轴向柱塞马达的实验研究、特性分析、结构优化及疲劳可靠度预测等提供重要参考和依据。 相似文献
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基于虚拟样机的发动机曲轴系动力学仿真分析 总被引:1,自引:0,他引:1
基于多刚体和柔性多体系统动力学理论,在虚拟样机软件平台下,针对分析问题不同的侧重点,建立了某型号发动机曲轴系多刚体和柔性多体动力学模型.仿真计算得到曲柄销载荷、活塞缸侧推力以及曲轴的扭转振动谱线等动力学参数.从一个角度证实了基于虚拟样机技术的发动机曲轴系动力学仿真分析的方便性与可靠性,并为发动机曲轴系的设计提供了依据. 相似文献
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液压柱塞泵压力脉动函数的仿真分析 总被引:1,自引:0,他引:1
张天霄 《振动、测试与诊断》2016,36(5):841-844
流量脉动会引起压力脉动,从而影响液压系统的工作性能,引起结构振动和辐射噪声,会造成液压元件和系统的疲劳破坏,因此仿真分析流量脉动和压力脉动函数对于有效抑制液压柱塞泵的振动和正确设计液压柱塞泵具有重要价值。笔者针对液压泵系统进行定量的振动与噪声分析时所必须具备的激励函数,首先,详细分析了液压泵系统的运行特性,采用傅里叶(Fourier)级数模拟液压泵系统激励函数;然后,建立了压力脉动函数模型;最后,模拟了压力脉动的函数曲线,解决了液压泵系统振动与噪声分析所必需的激励问题。该文为进一步研究液压柱塞泵的定量振动与噪声的响应提供了脉动激励描述,具有理论意义和实际应用价值。 相似文献
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液压柱塞泵出口压力脉动信号近似于周期信号,有比较明确的物理含义,携带着丰富的泵的健康状态信息,是柱塞泵健康管理比较理想的信号源。利用柱塞泵出口压力上的脉动成分,提出一种基于随机卷积核的柱塞泵异常检测方法,只需柱塞泵在正常工况下的压力脉动数据即可具备检测异常压力脉动数据的能力。该方法包括波形划分、异常数据段检测2个阶段:采用基于动态时间规整(Dynamic Time Warping, DTW)数据划分算法对柱塞泵压力脉动原始数据进行分割,获取压力脉动数据段以构建数据集;基于大量一维随机卷积核提取特征,获取正常状态下压力脉动数据段特征;使用孤立森林算法对基于随机卷积核提取的特征进行异常检测。该方法在真实数据集上的表现,表明其对于异常波形的判断有优异的表现,且查准率较单一孤立森林算法提升了6.3%。 相似文献
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轴向柱塞泵流体噪声的研究现状 总被引:9,自引:1,他引:8
压力冲击和流量脉动是柱塞泵流体噪声研究的两个关键内容,通过对国内外学者在该领域的研究情况进行总结归纳,发现该领域的研究主要围绕着实现对柱塞腔压力特性的数学建模和优化以及柱塞腔压力冲击和泵出口流量脉动的试验测试方法展开,分析他们各自的研究方法以及研究中存在的优势和不足。对柱塞腔压力特性进行数学建模分析,对几条主要影响因素包括:油液可压缩性、节流效应、柱塞的运动特性、间隙泄漏、油液惯性以及含气量对弹性模量影响等进行理论分析,并提出动态模型的建模思路。此外,对流量脉动的测试原理进行数学分析;对现有的七种典型的流量脉动测试方法进行归纳整理,对相应的试验台结构特点如管道、传感器安装位置、传感器性能要求、加载装置、信号采集和分析系统等特点进行说明;对今后流体噪声的研究方向和发展趋势做出预测。 相似文献
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液压系统中存在的压力脉动影响系统工作性能。运用流体网络理论,分析压力阀支路、终端封闭串联分支管路的动态特性传输方程,采用传递矩阵法建立液压管网压力-流量传递函数模型。应用MATLAB软件,得到液压管网在模拟柱塞泵流量脉动输入信号激励下的压力脉动曲线,并与液压振动测试实验台实测结果进行对比。结果表明:仿真模型具有一定的准确性,频谱分析与实测结果一致,脉动幅值误差率为3.8%。 相似文献