Error characteristic analysis of jet impact momentum law test apparatus based on a SPH-FEM coupling algorithm

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 253-260.

YANG Song , ZHU Xianyong, WANG Hui , YU Ping

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Abstract

A jet impact momentum law test apparatus is wildly used in fluid dynamics momentum law experimental teaching. The circular plate and sensor are the key structures in the test apparatus. The displacement response characteristics of plate-sensor and stress characteristics of sensor were calculated and analyzed by the SPH-FEM coupling algorithm under the condition of jet impact loads. Based on the results, displacement response ratio and the lateral effect theory of strain gauge were imported, the reasons and ranges of the apparatus measurement error were analyzed by those methods, the theory and method of error analysis were verified in combination with physical experiment. The deformation graph of the sensor structure was plotted with time. The results show that the irregular vibration of the circular plate and the sensor in the non-jet impact direction could lead apparatus measurement error. The measurement error estimated method based on displacement response ratio and the lateral effect theory is viable and effective. The relationship between measurement error caused by irregular vibration and displacement response ratio is linear.

Key words

momentum law / jet impact / SPH-FEM coupling algorithm / error analysis

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YANG Song,ZHU Xianyong, WANG Hui,YU Ping. Error characteristic analysis of jet impact momentum law test apparatus based on a SPH-FEM coupling algorithm[J]. Journal of Vibration and Shock, 2019, 38(16): 253-260

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