复杂流体下微弯型科氏质量流量计驱动控制、信号处理和误差修正方法研究与实现

项目名称： 复杂流体下微弯型科氏质量流量计驱动控制、信号处理和误差修正方法研究与实现

项目编号： No.61573124

项目类型： 面上项目

立项/批准年度： 2016

项目学科： 自动化技术、计算机技术

项目作者： 徐科军

作者单位： 合肥工业大学

项目金额： 16万元

中文摘要： 针对目前没有较好解决科氏质量流量计测量复杂流体的问题，特别是没有研究相位差更小、固有频率较高的微弯型科氏质量流量计测量复杂流体的问题，本项目拟建立流量管的数学模型，提出正负阶跃交替激励启振方法，使流量管快速启振；提出变传感器信号设定值的驱动控制方法，及时跟踪流量管振幅的变化，保持流量管的稳定振动；将MDAC和DDS相结合，实现复杂流体下的数字驱动控制。建立突变信号模型，反映批料流下信号特征，评估信号处理方法的动态性能。将带通滤波预处理、基于拉格朗日插值的数字过零检测和平均后处理有机结合，处理复杂流体下流量信号，响应速度更快，测量精度更高。将数字过零检测算法和数字驱动方法相结合，研制基于DSP的实时控制和处理系统，实现批料流和气液两相流的测量。设计和研制科氏质量流量计测量复杂流体流量的实验方案和装置，采用BP神经网络建立微弯型科氏质量流量计测量气液两相流误差模型，在线修正，提高测量精度。

中文关键词： 科氏质量流量计；气液两相流测量；数字驱动控制；数字信号处理；测量误差修正

英文摘要： There is no better solution of Coriolis mass flowmeter measuring complex fluids currently, especially no research of micro bend type Coriolis mass flowmeter with smaller phase difference and higher inherent frequency measuring complex fluids. Aiming at this problem, the mathematical model of the flow tube will be built, and a startup method of alternating exciting using positive-negative step signal will be proposed to shorten the startup time. A variable sensor-setting-value control method will be put forward to track the flowtube vibration amplitude variation promptly and maintain stable vibration of the flowtube. MDAC will be combined with DDS to realize the digital drive control under complex fluids. A mutation signal model will be set up to reflect the signal feature of batch flow and evaluate the dynamic performance of signal processing method. Band pass filter preprocessing, Lagrange interpolation based digital zero crossing detection and average post-processing will be combined to process the complex fluid flow signals, which makes the instrument faster response speed and higher measurement accuracy. Both the digital zero crossing detection algorithm and digital drive method will be applied to developing a DSP based real time controlling and processing system for achieving batch flow and gas-liquid two-p

英文关键词： Coriolis mass flow meter；gas-liquid two-phase flow measurement；digital drive control；digital signal processing；measurement error correction