大型砂尘风洞中砂尘浓度测量与控制方法的研究

Studies on Concentration Measurement and Control Methods of Large Wind Tunnel with Sand/Dust

摘要:

砂尘浓度指标严重影响砂尘风洞试验效果;在大型砂尘风洞中准确的测量及有效的控制砂尘浓度是砂尘风洞设备研制中的两个关键问题;针对动态试验工况环境中浓度传感器标定的问题,分析了浓度测量时标定参数与风速和浓度的关系,使用模型树算法建立了三者之间的关系模型,以此模型来预测各种动态情况下的标定参数;针对复杂环境下浓度动态控制问题,采用专家PID算法,提出了多回路控制系统结构和专家规则;工程实践表明该测量和控制方法满足了动态试验环境的需求,取得了良好效果;模型树算法和专家PID系统能有效的解决动态工况下砂尘浓度的测量与控制问题。

Abstract:

Sand/dust concentration can severely affect the test effect of sand/dust wind tunnel. Accuracy measure and effective control sand/dust concentration in large wind tunnel with sand/dust are pivotal matters in equipment development for wind tunnel with sand/dust. Aimed at the calibration problem of concentration sensor in dynamic operating condition, analysis the relations between calibration parameter, wind speed and concentration, model the relations with model tree, then use the model to forecast the calibration parameter under various dynamic conditions. A multiloop control system and expert regulation have been built with expert PID for solving concentration dynamic control problem in complex environment. Engineering practice show that the way of calculate calibration parameter and control method meet the requirement of dynamic test environment and perform well. Mode tree and expert PID can effectively solve the problem of concentration measurement and control in dynamic operating condition.