摘要
射流冲击型动量定律实验装置是流体力学动量定律验证实验中广泛使用的一种设备。圆形平板和传感器是动量定律实验装置的核心结构。采用SPH-FEM耦合算法对射流冲击载荷作用下,平板-传感器结构的位移响应特性及传感器的应力特性进行了计算和分析;在此基础上,引入位移响应比和应变片横向效应理论,对实验装置测量误差的产生原因及误差范围进行了探讨分析;结合物理实验,对误差分析理论及方法进行了验证,并绘制了传感器结构随时间的变形图。结果表明,圆形平板和传感器在非射流冲击方向上的不规则振动能会导致测量误差,依据横向效应理论和位移响应比构建的测量误差预测方法可行、有效,不规则振动引发测量误差的大小与位移响应比呈线性关系。
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.
作者
杨嵩
朱先勇
王辉
于萍
YANG Song;ZHU Xianyong;WANG Hui;YU Ping(College of Mechanical Science and Engineering,Jilin University,Changchun 130025,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第16期253-260,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51201068)
