基于SPH-FEM耦合法的射流冲击型动量定律实验装置误差特性分析

杨嵩,朱先勇,王辉,于萍

振动与冲击 ›› 2019, Vol. 38 ›› Issue (16) : 253-260.

PDF(1948 KB)
PDF(1948 KB)
振动与冲击 ›› 2019, Vol. 38 ›› Issue (16) : 253-260.
论文

 基于SPH-FEM耦合法的射流冲击型动量定律实验装置误差特性分析

  • 杨嵩,朱先勇,王辉,于萍
作者信息 +

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

  • YANG Song ,   ZHU Xianyong,  WANG Hui ,  YU Ping
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文章历史 +

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。

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.

关键词

动量定律 / 射流冲击 / SPH-FEM耦合算法 / 误差分析

Key words

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

引用本文

导出引用
杨嵩,朱先勇,王辉,于萍.  基于SPH-FEM耦合法的射流冲击型动量定律实验装置误差特性分析[J]. 振动与冲击, 2019, 38(16): 253-260
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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