考虑温度影响的表面波压力测量模型研究

薄壁压力容器是一种常见的工业设备,为了保证生产过程的顺利进行,经常需要检测它们的压力。表面波在材料表面的传播速度与表面应力有关,因此以表面应力为中间变量,建立了被测容器压力与由此引起的表面波传播时间变化之间的关系模型。考虑温度、温度应力对表面波传播速度的影响,以及温度变化引起的热变形对传播距离的影响,推导了表面波压力检测的修正模型,并对修正模型各参数进行了分析,得到简化模型。实验证明了模型的正确性。使用该方法时,压力测量最大误差为0.11 MPa,平均误差为0.045 MPa。

Research on pressure measurement model using surface wave considering temperature effect

Thin-walled pressure vessel is a kind of equipment used widely in modern industry.In order to ensure that the manufacturing process works properly and safely,it is necessary to measure the pressure in the vessel.It has been proved that the velocity of ultrasonic propagation in the medium may be affected by the stress applied to this medium.Therefore,using the stress as a middle variable,the relationship between the transit time difference and the pressure can be established.Taking into account of the effect...