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基于悬臂梁阀的微型压电泵的实验研究 总被引:3,自引:0,他引:3
利用压电晶片致动式压电泵的工作原理,提出一种整机采用迭片式结构,单向阀采用悬臂梁式薄片阀的新结构微型压电泵,设计、制作了实验样机,并对该泵的工作性能进行了较为系统的实验测试和研究,并提出了利用多腔体串联结构提高压电泵性能的优化设计方案。通过实验测试:该泵工作性能稳定,整机具有较高的体积功能比(样机尺寸:15 mm×1.8 mm;50 V正弦信号输入,80 Hz条件下,最大输出压力22 kPa,流量达到3.6 m l/m in)。该泵的设计方法及所用制作工艺对研发适于大量生产的实用微型泵是一个有益的尝试。 相似文献
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微型压电泵系统的设计研究 总被引:12,自引:7,他引:5
提出了一种整机采用迭片式结构,单向阀采用悬臂梁式薄片阀的新结构微型压电泵,设计、制作了实验用样机泵,设计了正弦信号发生器电路,将产生的正弦信号经过电压放大和功率放大后,作为该泵的电源驱动,通过对该泵的工作性能进行较为系统的实验测试和研究,提出了利用多腔体串联结构提高压电泵性能的优化设计方案。实验测试表明,该泵工作性能稳定(样机尺寸:Φ15 mm×1.8 mm;50 V正弦信号输入,80 Hz条件下,最大输出压力22 kPa,流量达到3.6 ml/min)。该泵的设计方法及所用制作工艺可用于研发大量生产的实用微型泵。 相似文献
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为提高无阀压电泵的流量特性和解决泵加工工艺性差的问题,研制出了锥形流管坡面腔底无阀泵。首先,提出并设计了锥形流管坡面腔底无阀泵,分析了该泵的工作原理;然后,利用ansys软件对泵腔内流场做了模拟分析,分析结果表明该泵具有传输流体的能力;最后,利用3D打印技术制作了锥形流管坡面腔底无阀泵,并对泵的频率-流量特性进行了试验,驱动频率为8Hz时,锥形流管坡面腔底无阀泵的流量达到最大值26.8ml/min,比相同尺寸坡面腔底无阀压电泵在相同驱动电压条件下输出的最大流量增加了18.6%。试验结果表明,锥形流管坡面腔底无阀泵的流量特性优于坡面腔底无阀压电泵,且采用3D打印技术制作压电泵,提高了泵加工的工艺性,缩短了加工周期,降低了加工成本。 相似文献
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"Y"形流管无阀压电泵模拟与试验 总被引:1,自引:1,他引:0
对"Y"形流管无阀压电泵内部流场及泵流量特性进行了模拟及试验研究.采用CFX软件对"Y"形流管无阀压电泵泵腔内的流场特性进行了模拟分析.结果表明:"Y"形流管无阀压电泵工作时泵腔内的压强变化很小,涡旋对流体传输活体细胞及长链大分子基本无影响.实际制作了"Y"形流管无阀压电泵,并通过改变"Y"形流管的几何尺寸,研究了压电泵进出口端压差的变化规律.试验结果表明,压差随支管夹角增大而减小,并且当两支管宽的和接近主管宽时,压差值达到最小,当支管夹角为5°,宽为1.2 mm时,压差达到最大725 Pa. 相似文献
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以三棱柱阻流体为无移动部件阀,结合3D打印技术的快速一体成型特点,设计并制作了以压电振子为动力源的三棱柱阻流体无阀压电泵。分析了该无阀压电泵的工作原理、理论流量和振子振动特性,推导出了它的的流量表达式。利用有限元法对三棱柱阻流体的流阻特性进行了仿真模拟,由其内部压强分布及进出口流速情况,定性分析了三棱柱阻流体的正反向流阻大小。最后,使用3D打印机制作了该无阀泵的试验样机,并进行了流阻和流量测量试验。试验结果表明:三棱柱阻流体具有正反向绕流流阻不等的特性,当驱动电压为550V,驱动频率为8 Hz时,该压电泵的输出流量达到最大,为29.8mL/min。结果证明了该三棱柱阻流体无阀压电泵具有良好的输送流体的能力。 相似文献
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针对高速轴向柱塞泵不同空化故障等级诊断依赖人工特征提取、识别准确率低的问题,提出了一种融合振动信号频谱分析和卷积神经网络的诊断方法。采集不同空化等级情况下柱塞泵壳体振动信号,对连续的振动数据进行切片并作频谱分析,获得频谱图作为数据集;利用二维卷积神经网络对不同空化等级的信号频谱图进行分类。为提高所提方法的鲁棒性,采用带通滤波的方法抑制频谱图中的噪声频率。试验结果表明:对于不同信噪比的振动信号输入,均能准确地识别出柱塞泵的空化故障等级。 相似文献
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Yi Li Guangwei Feng Xiaojun Li Qiaorui Si Zuchao Zhu 《Journal of Mechanical Science and Technology》2018,32(10):4711-4720
Cavitation is a challenging flow abnormality that leads to undesirable effects on the energy performance of the centrifugal pump and the reliable operation of the pump system. The onset and mechanism of a phenomenon that results in unsteady cavitation must be realised to ensure a reliable operation of pumps under the cavitation state. This study focuses on cavitation instability at normal flow rate, at which point the unsteady cavitation occurs as the available net positive suction head (NPSHa) falls below 5.61 m for the researched pump. An ameliorative algorithm–united algorithm for cavitation vibration analysis is proposed on the basis of short time Fourier transform (STFT) and Wigner–Ville distribution (WVD). The STFT–WVD method is then tested using vibration data measured from the centrifugal pump. The relationship between vibration and suction performance indicates that the inception and development of cavitation can be effectively detected by the distribution and intensity of the united algorithm at the testing points. Intermediate frequency components at approximately 6 kHz fluctuate initially with the development of cavitation. A time–frequency characteristic is found to be conducive to monitoring the cavitation performance of centrifugal pumps. 相似文献
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通过设计梳状滤波器和构造二维灰度图,保留振动信号的时域特征,解决了传统信号时域平均方法的滤波性能受信号周期估计误差和采样截断误差影响的问题,为提取振动信号的时域特征提供新的方法.推导了梳状滤波器的数学模型,给出了二维灰度图的构造方法,并通过仿真试验和应用实例验证了该方法的正确性. 相似文献
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针对高速轴向柱塞泵在不同空化程度下故障特征不明显导致识别准确率低的问题,提出了一种变分模态分解和极限梯度提升树融合的识别方法。在不同空化等级下进行高速轴向柱塞泵空化试验,采集壳体的振动加速度信号,对信号采用变分模态分解方法并从中提取故障特征以构造特征数据集,最后利用极限梯度提升树进行空化等级的识别。为证明所提方法的抗噪性能,在测试集中加入了随机高斯白噪声。结果表明,加入不同信噪比的噪声后,该识别模型仍能准确地识别出高速轴向柱塞泵的空化等级。 相似文献
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DISCOVERY AND ANALYSIS ON CAVI TATION IN PIEZOELECTRIC PUMPS 总被引:4,自引:0,他引:4
Zhang JianhuiCollege of Mechanical Engineering andApplied Electronic Technology Beijing University of Technology Beijing ChinaXia QixiaoCollege of Electromechanics Beijing Union University Beijing ChinaLai DehuaCollege of Mechanical Engineering andApplied Electronic Technology Beijing University of Technology Beijing ChinaOnuki Akiyoshi Hong ZhenDepartment of Engineering Yamagata University Yamagata Japan 《机械工程学报(英文版)》2004,17(4):591-594
The contributing factors for the cavitation in piezoelectric pumps are analyzed,theoretically, and the device fitting for observing and recording is set up. With it the experiments are carried out to observe the emergence and the flowing of the cavitations in the piezoelectric pumps. According to the statistic and the analysis to the data of the experiments, the peculiar features are discovered. These features are composed of balls-amassing, center-more, and flow-out. 相似文献
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Jan ?erneti? 《Measurement》2011,44(7):1293-1299
Measurement of noise and vibration signal in audible frequency range to detect cavitation in centrifugal pumps is rather unknown technique. There were already some studies performed on this technique and they showed quite good results. Due to many factors that influence the quality of the measurement, an uncertainty analysis should be performed. This paper deals with estimation of a measurement uncertainty for different kinds of measurement ways to detect the cavitation in a centrifugal pump with noise and vibration signal in audible frequency range from 20 Hz to 20 kHz. Especially the measurement uncertainties for cavitation detection in broad frequency range and at a discrete frequency were analyzed. Results showed that this technique is reliable despite many possible influences on uncertainty. 相似文献
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采样定理的拓展--一种新的非均匀采样规则 总被引:1,自引:0,他引:1
由于采样定量用来指导采样时段内信号的均匀采样(或重采样),但在实际中需要进行磋均匀采样,因此提出了一种新的非均匀采样规则,即让短时采样频率大于等于2倍的信号短时最大频率,以指导非均匀采样(或重采样)。经用两个仿真信号验证说明,非均匀采样的数据用样条插值恢复只有很小的数值误差,说明该规则是可行的,并将它与传统的非均匀采样定理做了比较,指出了它面向时变信号采样的特点。 相似文献
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Yue Wu Yong Liu Jianfang Liu Long Wang Xiaoyang Jiao Zhigang Yang 《Journal of Mechanical Science and Technology》2013,27(3):793-798
Piezoelectric pumps have the potential to be used in a variety of applications, such as in air circulation and compression. However, piezoelectric membrane pumps do not have enough driving capacity, and the heat induced during the direct contact between the driving part and the gas medium cannot be dissipated smoothly. When the gas is blocked, the piezoelectric vibrator generates heat quickly, which may eventually lead to damage. Resonantly driven piezoelectric stack pumps have high performance but no price advantage. In this situation, a novel, resonantly driven piezoelectric gas pump with annular bimorph as the driver is presented. In the study, the working principle of the novel pump was analyzed, the vibration mechanics model was determined, and the displacement amplified theory was studied. The outcome indicates that the displacement amplification factor is related with the original displacement provided by the piezoelectric bimorph. In addition, the displacement amplification effect is related to the stiffness of the spring lamination, adjustment spring, and piezoelectric vibrator, as well as to the systematic damping factor and the driving frequency. The experimental prototypes of the proposed pump were designed, and the displacement amplification effect and gas output performance were measured. At 70 V of sinusoidal AC driving voltage, the improved pump amplified the piezoelectric vibrator displacement by 4.2 times, the maximum gas output flow rate reached 1685 ml/min, and the temperature of the bimorph remained normal after 2000 hours of operation when the gas medium was blocked. 相似文献
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针对压电驱动器的高精度控制问题,提出一种自抗扰重复控制设计方法。首先,给出压电驱动系统的动力学模型;然后,在线性自抗扰控制(LADRC)中引入输出反馈积分控制器和一类插入式重复控制器,提出一种具有阶跃、斜坡和周期信号跟踪/抑制能力的自抗扰重复控制策略。进一步,结合小增益定理,分析闭环系统的稳定性及控制系统的设计方法。最后,将所提方法应用于一类压电驱动系统,实验结果表明该方法与LADRC相比,能显著提升控制效果,且高精度跟踪/抑制多种外部信号。 相似文献