气浮式测力传感器静特性的影响因素

Influence factors on static characteristics of flotation force transducers

采用理论、仿真及实验相结合的方法研究了气膜厚度、供气压力变化以及测压孔的设置对气浮测力传感器静特性的影响.叙述了喷嘴浮板机构的工作原理,建立了静特性方程.在不同气膜层厚度、不同供气压力和有无测压孔条件下,运用Fluent软件仿真出流场的气膜层速度和压力分布曲线,根据曲线分析了它们各自对气膜流场静特性的影响.最后,在气浮喷嘴实验平台上进行了实验验证.实验结果表明：气膜层厚度为5～ 100μm,供气压力分别为303、505、707kPa,软件仿真和实验所得到的线性度曲线、灵敏度曲线走向一致;有无测压孔对气膜层的承载力、速度没有太大影响.结果表明气膜厚度、供气压力的变化会影响气浮测力传感器静特性,而测压孔的设置对测力传感器的静特性无影响.

The effects of gas film thicknesses,gas pressures and pressure holes on the static characteristics of a floating force transducer were explored by combing theory,simulation and an experiment.The working principles of nozzle floating plate mechanism were introduced and a static characteristic quation was established.With a pressure hole or not,the Fluent software was used to simulate the gas blanket level speed and a pressure distribution curve under different gas film thicknesses and different air supply pressures.According to the curve,their influences on the static characteristics of gas membrane flow field were analyzed.Finally,an experiment was performed on a air nozzle experimental platform to verify the obtained results.It shows when the gas film thicknesses range 50μm to 100 μm and gas supply pressures are 303,505,707 kPa,the linearity curve and sensitivity curve obtained by software simulation are in agreement with that of experimental results.It has no much impact on the capacity and speeds of the gas film whether there is the pressure hole or not.It concludes that the gaps of gas film thickness and inlet pressures will effect on the flow field characteristics of nozzle floating plate mechanism seriouly,while setting the pressure hole has not affect on it.