共查询到20条相似文献,搜索用时 62 毫秒
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Current researches mainly focus on the investigations of the valve plate utilizing pressure relief grooves. However,air?release and cavitation can occur near the grooves. The valve plate utilizing damping holes show excellent perfor?mance in avoiding air?release and cavitation. This study aims to reduce the noise emitted from an axial piston pump using a novel valve plate utilizing damping holes. A dynamic pump model is developed,in which the fluid properties are carefully modeled to capture the phenomena of air release and cavitation. The causes of di erent noise sources are investigated using the model. A comprehensive parametric analysis is conducted to enhance the understanding of the e ects of the valve plate parameters on the noise sources. A multi?objective genetic algorithm optimization method is proposed to optimize the parameters of valve plate. The amplitudes of the swash plate moment and flow rates in the inlet and outlet ports are defined as the objective functions. The pressure overshoot and undershoot in the piston chamber are limited by properly constraining the highest and lowest pressure values. A comparison of the various noise sources between the original and optimized designs over a wide range of pressure levels shows that the noise sources are reduced at high pressures. The results of the sound pressure level measurements show that the optimized valve plate reduces the noise level by 1.6 d B(A) at the rated working condition. The proposed method is e ective in reducing the noise of axial piston pumps and contributes to the development of quieter axial piston machines. 相似文献
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恒压斜轴式变量泵排量大,压力高,广泛应用于工程机械、冶金机械、矿山机械和船舶等的液压系统中。其基本原理是通过设定先导比例溢流阀压力,缸体摆角自动调节,使泵出口压力与先导溢流阀设定值相同。在理论分析的基础上,采用SmulationX软件,构建了变量泵液压与机械的联合仿真模型,对比例变量恒压柱塞泵静态及动态输出压力流量特性进行分析,研究变量弹簧对动态特性的影响。仿真结果表明:恒压变量泵压力和流量特性稳定,变量弹簧刚度越大,恒压泵响应越快。该研究可为高性能液压泵元件的设计提供指导。 相似文献
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Sang-Yeol Kim Yun-Joo Nam Myeong-Kwan Park 《Journal of Mechanical Science and Technology》2006,20(10):1626-1637
The pressure pulsation due to the gear geometry of the gerotor (generalized rotor) pump mainly occurs in an instant that the
chamber of the gerotor enters the delivery port and leaves the suction one. Such a pressure pulsation may result in undesirable
vibration and noise of pump components as well as cavitation in hydraulic system. Therefore, it is very important to examine
the pressure characteristic of the gerotor pump at its design and analysis stages. In this paper, in order to reduce the pressure
pulsation in the gerotor pump, the port plate with the relief grooves is designed by referring to as notch of vane pump and
relief groove of piston pump. A series of the theoretical analyses on the pressure pulsation is performed in consideration
of various design parameters of the port plate, including the installation positions of the port inlet/ outlet and the groove
width, and the operating conditions such as rotational velocity and delivery pressure. 相似文献
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Design and experimental verification of a port plate in a gerotor pump to reduce pressure pulsation 总被引:1,自引:0,他引:1
Hee-Jee Sung Hyung-Ki Min Yun-Joo Nam Myung-Kwan Park 《Journal of Mechanical Science and Technology》2018,32(2):671-678
In a gerotor pump, pressure pulsation occurs in a chamber through contact with the internal and external rotors. This causes an overhung load on the pump shaft bearing and cavitation, which affect the durability and noise of the pump. In this study, relief grooves on the port plate were designed to reduce pressure pulsation and verified experimentally. The opening areas between the port plate and chamber with and without relief grooves were obtained. The relation between the pressure pulsation and relief grooves was examined through a simulation and verified experimentally. The results indicated that the relief grooves were very effective at reducing and stabilizing the pressure pulsation of the pump outlet and in the chamber. Thus, installing relief grooves on the port plate can improve the durability of the pump and allow the size of the motor coupled with the pump to be reduced. 相似文献
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轴向柱塞泵配流盘三角形节流槽主要是减小柱塞腔及泵出口压力的波动。由于节流槽过流面积小,且槽两端压差大,流体高速流过节流槽的同时压力急剧减小,从而产生空化。为减小配流盘三角形节流槽的空化,提出对配流盘三角形节流槽抗空化的结构改进方案:预卸压阶段,在不改变节流槽通流面积的条件下,减小三角形节流槽倾角可提高其空化抑制性;预升压阶段,在保证三角形节流槽进口过流面积不变时,增大出口的过流面积可有效抑制三角形节流槽的空化。通过仿真分析发现三角形节流槽结构改进后轴向柱塞泵的抗空化性能提高,泵空化程度降低。 相似文献
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为减小“困油”所引起的压力冲击与流量脉动,基于双斜型卸荷槽、根据齿轮的啮合特点以及啮合过程中困油腔容积的变化规律,对原耳形卸荷槽进行优化,设计了一种具有更大卸荷面积、结构更加紧凑且易加工的梯形卸荷槽。在数值模拟过程中,分别监测耳形、梯形卸荷槽所在的齿轮泵流场困油区压力与出油口流量变化情况。结果表明:当转速在1000~4000 r/min内变化时,梯形卸荷槽能使困油容积区域压力峰值比耳形卸荷槽分别降低36.3%~47.5%,10.7%~22.5%;能使出油口流量脉动系数降低20%~86.1%。证明了梯形卸荷槽降低困油压力缓解困油现象的高效性与降低泵出油口流量脉动的有效性,为渐开线外啮合齿轮泵卸荷槽的创新设计提供了一种新的途径。 相似文献
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Wu Xiaofeng Chen Chihkeng Hong Chihwei He Yafeng 《Journal of Mechanical Science and Technology》2017,31(9):4245-4254
Journal of Mechanical Science and Technology - The ripple in the outlet flow from a high-pressure piston pump is caused by pressure pulses in the piston cavity when it rotates through the... 相似文献
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高压子母叶片泵流量均匀性 总被引:2,自引:0,他引:2
针对液压用油的可压缩性,研究高压子母叶片泵流量均匀性及其改善的办法。对液压传动领域中传统的忽略油液可压缩性的理论瞬时流量公式进行修正,建立考虑油液可压缩性时的理论瞬时流量数学模型,绘出理论瞬时流量波形图,计算出流量不均匀系数。通过研究泵的工况参数变化与流量不均匀系数的关系,确定影响高压子母叶片泵流量均匀性的主要因素是油液的体积弹性模量、泵的工作压力、转速和阻尼的结构型式及参数,而不是排油腔几何容积变化率的不均匀性。研究结果表明,选择合适的阻尼结构型式及参数,使工作腔在预升压过程中,由机械闭死压缩、阻尼倒灌及吸油区叶片伸出耗油而产生的瞬时损失流量在时域上叠加,并将叠加后的幅值近似为常值,可有效地改善泵的瞬时流量均匀性。 相似文献
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现有的柱塞泵一般采用1个缸体同时集成多个柱塞,多个柱塞通过缸体耦合在一起,不能独立控制,多个柱塞只能按某特定规律运动,共同完成吸油和排油。在工作中,存在高效区域无法随负载动态调整和单液压泵不能同时输出多级压力匹配不同负载需求的缺点,为此提出一种矩阵式多单柱塞泵重组液压驱动系统。针对所提出新型液压驱动系统的前期探索研究,分析单柱塞泵流量压力输出特性,在详细阐述单柱塞泵结构特点的基础上,研究了单柱塞泵的工作原理。通过AMESim建立单柱塞泵的流量压力仿真模型,分析单柱塞泵的机电液的耦合特性和流量压力输出特性,讨论蓄能器和单柱塞泵的液压耦合特性,最后通过实验研究对单柱塞泵的特性进行验证。 相似文献
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为了能用单台泵独立控制两条液压回路,在现有轴向柱塞泵的基础上,把泵的排油配流窗口分成两个串联配流窗口,与之对应的两个出油口分别连接两条油路。为了验证设计方案的可行性,在多学科仿真软件Simula-tionX中建立新型双排油轴向柱塞泵的仿真模型,对柱塞腔流量和压力在两个串联配流窗口之间过渡区域的特性做了仿真研究,确定了配流盘的结构,进一步制造了样机并进行试验测试。试验结果验证了仿真结果的正确性,研究工作为进一步推广运用新型双排油轴向柱塞泵奠定了理论基础。 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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