基于优化控制方法的水流量标准装置特性研究

Study on Characteristics of Water Flow Standard Device Based on Optimal Control Methods

水流量标准装置计量特性优化问题一直是流量领域研究的重点和难点。通过分析传统水流量标准装置结构及试验过程,指出存在的主要问题,利用新型单向换向、基于陷波器技术的脉冲相位补偿技术两种优化控制方法提升水流量标准装置的计量特性;同时对装置稳定性与流量稳定度的影响也进行了探讨。以静态质量法水流量标准装置为例,分别对传统装置、应用优化控制方法后的装置进行测量结果不确定度验证,证明应用优化控制方法后的装置扩展不确定度较传统装置降低了4‰(占原有扩展不确定度的1/5),方法效果显著,有良好的实用价值。

The optimization of metrological characteristics of water flow calibration facility has always been the focus and difficulty in the field of flow research.The main problems were pointed out through the analysis of the structure and test process of the traditional water flow calibration facility.Two kinds of optimal control method,such as new one-way commutation technology and pulse phase compensation technique based on notch filter technology were used to improve the metrological characteristics of water flow calibration facility;in addition,the influences of the device stability and the flow stability were also discussed.Then,taking the water flow calibration facility with static mass method as an example,the measurement uncertainty of traditional water flow facility and the device applying the optimal control method were verified respectively.The evaluation results show that the expanded uncertainty of the device applying the optimal control method is 4‰lower than that of the traditional facility(1/5 of the original expanded uncertainty).It proves that the method is very effective and has good practical value.