Dynamic Estimating measurement of Instantaneous Flow Rate Using Automatically Generated Fluid Line Model.

使用自动生成的流体管线模型动态估计测量瞬时流量。

• 批准号: 60550167
• 负责人: HAKOMORI Kyojiro
• 金额: $ 1.28万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550167/
• 关键词: Unsteady Flow Rate Measurement; Fluid Line Dynamical Model; Distributed-parameter System; Finite Element Method; Extended Kalman Filter; Flow Velocity Profile; Beam Scanning Laser Doppler Velocimeter; 助走区間内流れ

The aim of this study is to extend the application area of the measuring method of instantaneous flow rate in a pipe through model-based estimation of velocity profiles to more general cases, where the analytical model of fluid lines is unknown or hard to know, by establishing a method to generate the fluid line model automatically in effective combination with approaches by beam scanning LDV, which leads to realization of a precision instantaneous flowmeter.The summary of the results is as follows:1. Finite element method to derive lumped-parameter models of fluid lines was introduced.2. Two kinds of automatic generation method of fluid line models, each has features in derivation process of a linearized dynamical model including a set of unknown parameters, has been proposed. Simultaneous estimation of velocity profiles and value of the model parameters are executed using extended Kalman filering technique from flow velocity data at representative points in the cross-sectional area of the fluid line.Some problems, such as necessary number and optimum arrangement of the points and fitness of the model to flow boundary conditions, are also examined.3. Beam scanning LDV and flow signal generating system have been improved.4. A flow simulator, as numerical experiments, for the unsteady laminar pipe/duct flow by finite difference method has been developed.5. By applying the proposed method of item 2 to the measurement of unsteady laminar flow over the whole entrance region in a circular pipe, and comparing the estimated velocity profiles with the experimental results from items 3 and 4, the methods are proved to be effective.6. Extension of the method to rectangular duct flows was made and confirmed experimentally.7. Next step is to apply the method to turbulent or laminar-turbulent flows.

本研究的目的是通过建立一种自动生成流体管路模型的方法，并与激光束扫描LDV方法有效结合，将基于模型的速度剖面估计的管道瞬时流量测量方法的应用范围扩展到更一般的流体管路解析模型未知或难以获知的情况，实现了一种高精度瞬时流量计。介绍了流体管路集中参数模型的有限元推导方法.提出了两种流体管路模型的自动生成方法，每种方法都具有推导包含一组未知参数的线性化动态模型的特点。利用扩展卡尔曼滤波技术，从流体管道横截面上代表性点的流速数据同时估计速度分布和模型参数值，并对所需点的数目、最佳布置以及模型对流动边界条件的适应性等问题进行了研究.改进了束扫描LDV和流量信号发生系统.开发了一套管道非定常层流流动的有限差分数值模拟器，并进行了数值实验.将第2项所提出的方法应用于圆管整个入口区域的非定常层流流动的测量，并将估算的速度分布与第3项和第4项的实验结果进行了比较，证明了该方法的有效性.将该方法推广到矩形管流，并进行了实验验证.下一步是将该方法应用于湍流或层流湍流。

项目成果

F, Liu and two others: "Derivation of Fluid Line Dynamical Models Using Finite Element Method" Preprint of SICE Tohoku Branch 96th Research Meeting. 96-5. 1-10. (1985)

F、刘等两人：《利用有限元法推导流体线动力学模型》SICE东北分会第96次研究会预印本。

M. Uchiyama and two others: "A Linear Estimator of Unsteady Flow Velocity Profiles in the Inlet Region of a Circular Pipe," Proceedings of the 25th SICE Annual Conference. 621-622. (1986)

M. Uchiyama 和另外两人：“圆形管道入口区域非稳态流速剖面的线性估计器”，第 25 届 SICE 年会论文集。

F. Liu and two others: "Estimation of Transient Flow Velocity Profiles in the Entrance Region of a Circular Pipe" Proceedings of SICE 4th Symposium on Fluid Measurement. 89-92. (1987)

F. Liu 等两人：“圆管入口区域瞬态流速剖面的估计”SICE 第四届流体测量研讨会论文集。

劉凡ほか: 計測自動制御学会第4回流体計測シンポジウム資料. 89-92 (1987)

刘帆等人：仪器与控制工程师学会第四届流体测量研讨会的材料 89-92 (1987)。

F. Liu and two others: "Derivation of Fluid Line Dynamical Models Using Finite Element Method" Proceedings of the 28th Joint Automatic Control Conference. 29-30. (1985)

F. Liu等二人：《利用有限元法推导流体管路动力学模型》第28届自动控制联合会议论文集。