共查询到17条相似文献,搜索用时 343 毫秒
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空化是影响轴向柱塞泵性能的主要因素之一, 将引起轴向柱塞泵的内部冲击和噪声, 甚至失效等问题。采用Pumplinx建立轴向柱塞泵内部流体域动态模型, 仿真分析了轴向柱塞泵配流盘吸油口卸荷槽和腰型槽内部流场速度、压力及空泡随时间的变化规律。研究结果表明, 空化不仅影响配流盘卸荷槽的高低压过渡区, 而且对配流盘吸油口侧的腰型槽内壁同样会产生严重影响。通过对比斜盘轴向柱塞泵在35 MPa全排量工况下, 耐久性试验过程中出现的配流盘吸油口腰型槽内壁表面金属剥蚀区域, 验证了仿真结果的准确性。 相似文献
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该文针对轴向柱塞泵的配流盘减振结构;分析、叙述了预升(卸)压区的压力特性与倒灌流量以及倒灌流量对泵流量脉动的影响因素,并提出了孔槽结合的新型减振结构,理论与试验表明可进一步降低泵的噪声。 相似文献
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轴向柱塞泵非止点配流窗口过渡区压力脉动特性分析 总被引:2,自引:1,他引:2
为能用单台泵直接闭式控制差动缸运动,把轴向柱塞泵的吸油配流窗口改为两个独立的窗口,一个连接差动液压缸的有杆腔,另一个连接低压油箱,用于平衡差动缸的面积比,但柱塞通过这两个配流窗口之间的过渡区时,因处于泵的非止点位置,柱塞腔容积变化较大,引起大的流量和压力变化,产生大的噪声,为了减小其影响,需要对柱塞通过此过渡区域的特性进行分析.为此,采用仿真软件SimulationX,建立柱塞通过配流窗口的仿真计算模型,对单个柱塞腔内部以及泵输出油口压力和流量动态过程进行仿真,综合运用减震三角槽、阻尼孔和等效预压缩角三种措施,减小泵的流量和压力脉动.通过仿真计算,确定出合理的配流盘结构参数.在此基础上,进一步制造出样机,对泵的压力脉动特性进行试验测试,验证仿真结果及设计参数的正确性.研究工作丰富了柱塞泵的类型. 相似文献
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为了节省功率电传系统的安装空间和重量,需要用泵直接闭环控制差动缸运动,将泵的吸油配流窗口改为2个窗口,以匹配差动缸的面积比。该结构变化导致其压力脉动增大,产生大的振动噪声,为了减小其影响,提出了一种阻尼槽-缓冲容腔-导油槽非对称配流盘结构,针对该结构开展了非对称配流流量特性的内部流场仿真分析,并通过了压力脉动特性试验验证。结果表明了非对称轴向柱塞泵的配流结构设计与仿真的合理性,实现了液压泵的新功能。 相似文献
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本文主要分析了斜盘型轴向柱塞泵产生噪声的机理,指出了降低噪声的设计着眼点,推导了低噪声型配流盘阻尼孔及三角槽计算公式,并通过计算机求解了柱塞腔内液体压力的变化曲线。最后通过试验证实了设计方法的正确性。 相似文献
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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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当斜盘轴向柱塞泵处于高压工况时,其配流盘会产生翘曲变形。基于弹性流体动力润滑理论,建立斜盘轴向柱塞泵配流副流固耦合模型,求解配流副润滑控制方程,分析了斜盘轴向柱塞泵缸体转速、缸体倾角、液压油黏度、配流副油膜厚度、配流副密封带宽度等工况与结构参数对其配流盘发生翘曲变形的影响。研究显示:斜盘轴向柱塞泵配流盘变形云图以腰形槽中心连线为轴线呈现一定的对称分布;配流盘高压侧外密封带区域变形最大,配流盘低压侧外密封带区域变形最小;在相同工况下,配流盘的材料与结构影响配流副油膜厚度与形状。 相似文献
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Pressure variation is one of the major sources on noise emission in the axial type oil piston pumps. Therefore, it is necessary
that the pressure variation characteristics of the oil hydraulic piston pumps be clarified to reduce the pump noise. Pressure
variations in a cylinder at the discharge region and the pump noise were simultaneously measured with discharge pressures
and rotational speeds during the pump working. To investigate the effects of the pre-compres-sion and the V-notch in the valve
plate, we used the three types of valve plates. In this research, it is clear that the pressure variation characteristics
of axial type oil piston pumps is deeply related to the pre-compression and to the V-notch design in valve plate. Therefore,
we could reduce the pump noise by using the appropriate pre-compression angle and the notch design that are between the suction
port and the discharge port in valve plate. 相似文献
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The objectives of this study were to analytically and experimentally investigate the motion of the floating valve plate in an axial piston pump under various operating conditions. To achieve the objectives of the analytical investigation, the equations of motion for the valve plate were coupled with a time-dependent lubrication model. The balance pistons that support the floating valve plate were represented by equivalent spring and dashpot systems. The system of equations was then solved using the Runge-Kutta and the control volume finite difference methods to determine the pressure, film thickness, and motion of the valve plate for various operating conditions. To achieve the experimental objectives, a previously developed axial piston pump test rig was instrumented with proximity probes to measure the motion of the valve plate. The stiffness and damping of the balance pistons supporting the floating valve plate were determined using the impact and frequency response methods. Using the experimentally determined stiffness and damping coefficients in the coupled dynamic lubrication model, the analytical and experimental results of the valve plate motions were compared. The model was then used to conduct a parametric study to determine the overall system stiffness and damping coefficients during pump operation. Using the stiffness and damping coefficients from the parametric study in the dynamic lubrication model, the pressure, film thickness, and motion of the valve plate were calculated for various operating conditions. The experimental and analytical displacements of the valve plate were then corroborated and found to be in good agreement. 相似文献