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    • 8. 发明专利
    • Cavitation air bubble impact pressure detection device
    • CAVITATION AIR BUBBLE IMPACT PRESSURE DETECTION DEVICE
    • JP2007170981A
    • 2007-07-05
    • JP2005368988
    • 2005-12-22
    • Hitachi Plant Technologies Ltd株式会社日立プラントテクノロジー
    • FUKAYA SEIJIHARADA ICHIROONO SHIGEYOSHIUDO RYUJIRO
    • G01L23/08F04D29/66G01H17/00
    • F04D15/0088F04D29/669
    • PROBLEM TO BE SOLVED: To dispense with a database for correlating a measured value of a vibration acceleration with a cavitation air bubble impact pressure; to reduce an influence of a dispersion or an error of the vibration acceleration; and simultaneously to detect the cavitation air bubble impact pressure. SOLUTION: A plurality of vibration acceleration sensors are mounted on an apparatus wherein cavitation is generated in working fluid, and the cavitation air bubble impact pressure is extracted by performing least square approximation processing of a plurality of measured vibration acceleration values by using a prescribed resistance coefficient calculated in consideration of the attenuation rate or transmission rate through a different kind medium interface of a pressure wave propagating from a cavitation generation position to each vibration acceleration sensor position, the wall thickness and the density of a sensor installation part or the like. COPYRIGHT: (C)2007,JPO&INPIT
    • 要解决的问题:省略将振动加速度的测量值与空化气泡冲击压力相关联的数据库; 以减小振动加速度的分散或误差的影响; 同时检测气蚀气泡的冲击压力。 解决方案:多个振动加速度传感器安装在其中在工作流体中产生空化的装置上,并且通过使用多个测量的振动加速度值进行最小二乘逼近处理来提取空化气泡冲击压力 考虑到通过从空化产生位置传播到各振动加速度传感器位置的压力波的不同种类的介质界面的衰减率或传输速率计算的规定电阻系数,传感器安装部件等的壁厚和密度 。 版权所有(C)2007,JPO&INPIT