On the pressure ripple measurement in variable displacement vane pumps
On the pressure ripple measurement in variable displacement vane pumps
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DOI：
10.1115/1.4024110
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发表时间：
2013-09
影响因子：
2
通讯作者：
E. Mucchi;G. Cremonini;S. Delvecchio;G. Dalpiaz
中科院分区：
文献类型：
--
作者：
E. Mucchi;G. Cremonini;S. Delvecchio;G. Dalpiaz
叶片泵在整个轴旋转过程中的压力演变趋势中表现出压力涟漪。压力涟漪可以决定系统内的振荡力，导致振动和噪声产生。在此背景下，本文的重点是通过使用两种不同的方法在叶片泵的压力演变的实验测量。测量结果显示，突出的优点和缺点，这两种方法。在第一种方法中，压力传感器直接面对两个叶片之间的体积，在第二种方法中，传感器位于外部腔室内，油通过转子轴中适当设计的管道传输。简单地说，第一种方法在压力演变方面给出了更好的结果，但在设置中涉及一些实际问题：测量结果显示压力偏移强烈依赖于用于传感器安装的紧固扭矩和低压区域中的负压值。第二种方法建立起来比较简单，但结果受载油测量管道动态特性的影响。为了避免这种管道的共振，振动声学有限元（FE）模型的油腔已经开发。通过有限元模型获得的数值频率响应函数已被用于优化测量管道的几何形状，减少油管道的共振的影响。结果表明，使用这种改进的方法，测量压力的动态分量不显着影响的测量管道的频率响应时，出口压力高于50巴，而对于较低的出口压力的测量管道的第一共振是接近主叶片谐波。
Vane pumps exhibit pressure ripple in the pressure evolution trend during a complete shaft rotation. Pressure ripple can determine oscillating forces within the system leading to vibration and noise generation. In this context, this paper is focused on the experimental measurement of the pressure evolution in vane pumps by using two different methodologies. Results of measurements are shown, highlighting advantages and disadvantages of both methodologies. In the first method a pressure transducer is directly facing the volume between two vanes, in the second method the sensor is located inside an external chamber where the oil is transferred via a duct suitably designed in the rotor shaft. Briefly, the first method gives better results in terms of pressure evolution but involves some practical problems in the setup: the measurements exhibit pressure offsets strongly dependent on the tightening torque used for sensor mounting and negative pressure values in the low pressure region. The second method is simpler to set up but the results are influenced by the dynamical behavior of the measurement duct carrying oil. In order to avoid resonances of this duct, a vibro-acoustical finite element (FE) model of the oil cavity has been developed. The numerical frequency response functions obtained by the FE model have been used in order to optimize the geometry of the measurement duct, reducing the effects of the resonances of the oil ducts. It is shown that, using this improved methodology, the dynamical components of the measured pressure are not significantly influenced by the frequency response of the measurement duct when the outlet pressures is higher than 50 bar, while for lower outlet pressure the first resonance of the measurement duct is close to the main vane harmonics.