热室气动位置传感器反馈滞后补偿研究  

Research on Delayed-feedback Compensationof Pneumatic Position Sensor in Hot Cell

作　　者：周科源[1] 董建鹏 董碧波[1] 杨贺[1] 向柔潼 ZHOU Keyuan;DONG Jianpeng;DONG Bibo;YANG He;XIANG Routong(China Institute of Atomic Energy,Beijing 102413,China;Chongqing University,Chongqing 400044,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]重庆大学,重庆400044

出　　处：《原子能科学技术》2024年第6期1380-1392,共13页Atomic Energy Science and Technology

基　　金：国家自然科学基金(52305527);中国博士后科学基金面上项目(2023M740397)。

摘　　要：热室辐照环境中的各类型射线会严重影响电子元件的服役寿命,因此目前多采用气动位置传感器来替代,其将感知及信号处理部分分别置于辐照环境和热室绿区来提高传感器的可靠性。由于气体的可压缩性,气动位置传感器存在信号反馈滞后现象。为了改善上述问题,分析了气动位置传感器的流量特性,建立了管道内流场数值模型并采用特征线法进行求解,构建了传感器压力响应预测模型,推导得到滞后量,并基于此提出了补偿策略。最后搭建了气动位置传感器响应检测平台,验证了预测模型及滞后补偿策略的有效性,结果表明:补偿后的位置相对预期值最大差值在0.5 mm以内,能够满足工程应用要求。The various types of radiation in the hot cell(irradiation atmospheres)can seriously affect the service life of electronic components.Therefore,a pneumatic position sensor that can be applied in irradiation conditions based on the non-contact pneumatic position sensor is proposed in this paper.The sensor separates the signal processing part and the sensing part.During the working process,the sensing part perceives the position information of the workpiece and transmits the signal to the processing part through the gas circuit.If the pressure signal at the processing part shows an expected change,it can be determined that the workpiece(such as spent fuel assembly)has reached the designated position.Due to the compressibility of gas,there is a signal delayed-feedback phenomenon in pneumatic position sensors.To improve the above issues,the flow field inside the sensor was decomposed into pipes and valve switches for flow characteristic analysis.A model of the internal fluid domain of the valve switch was established.The relationship between the flow rate and pressure ratio of the valve switch under different opening degrees was obtained,and then the influence of valve openings on the critical pressure ratio and sonic conductance of gas flow was elucidated.Based on the assumption that the gas medium was ideal air and the flow inside pipes was single-phase,the internal flow field model of pipes was derived.The method of characteristics was used to numerically solve the above mentioned model,and the influence of pipe diameter and pipe length on the flow characteristics were analyzed.The results show that the sonic conductance and the critical pressure ratio of air flow are positively correlated with pipe diameter and negatively correlated with pipe length.The pressure response prediction model of the sensor was constructed and the hysteresis was calculated.The compensation strategy for signal delayed-feedback was proposed based on the hysteresis.Finally,a pneumatic position sensor response detection platform was built

关 键 词：反馈滞后 压力响应 特征线法 补偿 预测模型 

分 类 号：TL99[核科学技术—核技术及应用] TP202.2[自动化与计算机技术—检测技术与自动化装置]