Real-time Diagnosis of Flow by Using Pressure Wave

利用压力波实时诊断流量

• 批准号: 01460112
• 负责人: MIYAKE Yutaka
• 金额: $ 4.29万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460112/
• 关键词: Pressure Wave; Electric Discharge in Water; Flow Diagnosis; Identification; Inverse Problem; Boundary Element Method; Wave Equation; 音波; 堺界要素法; 同定問題; 実時間診断; パルス波; 逆解析; キャビテ-ション同定; 異物同定

The puropose of the present research is to defvelop a flow diagnosis method on the basis of the numerical calculation on the computer. The flow diagnosis means detecting and identifying obstacles or cavities included in the flow field of pipes or fluid machines. At first, basic research wag performed for* a simple-shaped closed tank filled with water before general flow passage is treated. A small electric discharge with high energy was generated in two kinds of rectangular tanks, i. e., one made of acrylic resin and the etlier made of brass, and impulsive pressure wave was generated by sudden generation of a bubble due to the discliarge. Stable generation of the bubble, correct synchronization of a discharge circuit and a sensing circuit, receiving of signal having very high frequency, and high speed data access to the computer using A/D converter were achieved and highly accurate measurement of flow was possible. According to the results calculated from the data, it was shown that a one-dimensional method gives a satisfactory solution for an obstacle of simple shape (e. g., sphere). Although the actual shape of pressure wave front is unsteady and complex, the one-dimensional geometric - acoustics gives a solution with high accuracy if the wave fronts are considered of passing through, refracting on and diffracting around the obstacle body. However, in calculating the reflection wave from the wall boundar the one - dimensional solution was not adequate but, the reflection property due to acoustic impedance of the wall should be considered correctly., On the other hand, in the case of obstacle body of complex shape, three-dimensional inverse solution. to the wave equation must be calculated. In the present research, we proposed a three-dimensional boundary element method which gives high accuracy solution to the wave equation. The rail-time identification of three-dimensional obstacles is under development and we plan to report the results.

本研究的纯净是根据计算机上的数值计算来使流量诊断方法辩护。流量诊断是指检测和识别管道或流体机流场中包含的障碍物或空腔。最初，在处理一般流通道之前，为*简单形的闭合罐进行了基础研究摇摆。在两种矩形储罐中产生了高能量的少量电排放。例如，一种由丙烯酸树脂制成的，由黄铜制成的Etlier和脉冲压力波是由于披露引起的突然产生的气泡而产生的。可以使用A/D转换器稳定生成气泡，正确同步的放电电路和传感电路，接收具有很高频率的信号以及高速数据访问计算机，并且可以进行高度准确的流量测量。根据从数据计算得出的结果，结果表明，一维方法为简单形状的障碍物提供了令人满意的解决方案（例如，球体）。尽管压力波锋的实际形状是不稳定和复杂的，但如果考虑通过，绕障碍物绕过，折射和衍射，一维几何形状 - 声音具有很高精度的溶液。但是，在计算壁边界的反射波时，一个维溶液不够，但是，应正确考虑由于壁的声阻抗而引起的反射特性。另一方面，在复杂形状的障碍物体体的情况下，三维倒数溶液。必须计算到波方程。在本研究中，我们提出了一种三维边界元素方法，该方法为波方程提供了很高的精度解决方案。三维障碍的铁路时间识别正在发展，我们计划报告结果。

项目成果

Akasaki, T., Miyake, Y. and Bando, K.: ""Basic Research of Flow Diagnosis by Pressure Wave"" Proceedings of 66th Annual Meeting of JSME Kansai Branch. No. 914-2. 31-33 (1991)

Akasaki, T.、Miyake, Y. 和 Bando, K.：“压力波流量诊断的基础研究”JSME 关西分会第 66 届年会论文集。

三宅,板東,赤碕: "水中火花放電による圧力波の発生とその伝ぱ" 日本機械学会論文集(B編). 57巻541号. 3267-3272 (1991)

Miyake，Bando，Akasaki：“水下火花放电产生的压力波”，日本机械工程师学会会刊（B 版），第 541 卷，3267-3272（1991 年）。

三宅 裕,板東 潔,赤碕 琢也: "水中火花放電による圧力波の発生とその伝ぱ" 日本機械学会論文集. 57ー541. 3267-3272 (1991)

Yutaka Miyake、Kiyoshi Bando、Takuy​​a Akasaki：“水下火花放电产生的压力波及其传播”，日本机械工程师学会汇刊 57-541 (1991)。

Miyake, Y., Bando, K. and Akasaki, T.: ""Generation and Propagation of Pressure Wave by Spark Discharge in Water"" Trans. JSME (B). 57-541. 3267-3272 (1991)

Miyake, Y.、Bando, K. 和 Akasaki, T.：“水中火花放电产生和传播压力波”Trans。

Yutaka MIYAKE,Kiyoshi BANDO,Takuya AKASAKI: "Generation of lmpulsive Pressure Wave by Spark Discharge in Water and its Propagation" International Jounal of Experimental Heat Transfer,Thermodynamics,and Fluid Mechanics(Experimental Thermal and Fluid Scienc

Yutaka MIYAKE、Kiyoshi BANDO、Takuy​​a AKASAKI：“水中火花放电产生的脉冲压力波及其传播”International Journal of Experimental Heat Transfer,Thermodynamics,and Fluid Mechanics(实验热与流体科学)