Signal processing for determining water height in steam pipes with dynamic surface conditions

Development and Testing of a Multitransducer System for Measuring Height of Condensed Water in Steam Pipes With Steady-State and Turbulent Flow Conditions

Journal of Nondestructive Evaluation Diagnostics and Prognostics of Engineering Systems ◽

10.1115/1.4040112 ◽

2018 ◽

Vol 1 (3) ◽

Author(s):

Shyh-Shiuh Lih ◽

Hyeong Jae Lee ◽

Yoseph Bar-Cohen ◽

Mircea Badescu

Keyword(s):

Signal Processing ◽

Steady State ◽

Turbulent Flow ◽

In Situ Monitoring ◽

Flow Conditions ◽

Dynamic Surface ◽

Steam Pipes ◽

Turbulent Flow Conditions ◽

Water Height

A system consisting of a multiplexer and multiple ultrasonic probes was developed for in situ monitoring of the water condensation height in steam pipes under steady-state and turbulent flow conditions. The measurement method, the signal processing techniques, the experimental setup, and the test results are presented in this paper. The feasibility and efficiency of the developed multitransducers and signal processing algorithms were demonstrated. The measured water height and wave pattern in dynamic surface conditions inside the pipe were verified through the snapshot of the recorded video images. The developed methodology built the framework for the use of multiple transducers array ultrasonic system for practical application to in situ monitor the water height in steam pipes.

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Advanced signal processing for high temperatures health monitoring of condensed water height in steam pipes

10.1117/12.2021303 ◽

2013 ◽

Cited By ~ 1

Author(s):

Shyh-Shiuh Lih ◽

Yoseph Bar-Cohen ◽

Hyeong Jae Lee ◽

Nobuyuki Takano ◽

Xiaoqi Bao

Keyword(s):

Signal Processing ◽

High Temperatures ◽

Health Monitoring ◽

Condensed Water ◽

Steam Pipes ◽

Water Height

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Characterization of postural balance in children under static and dynamic surface conditions

Gait & Posture ◽

10.1016/j.gaitpost.2010.10.073 ◽

2011 ◽

Vol 33 ◽

pp. S60

Author(s):

J.L. Jackson ◽

M. Petrarca ◽

F. Patané ◽

P. Cappa

Keyword(s):

Postural Balance ◽

Dynamic Surface ◽

Surface Conditions

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The oxidation of Inconel alloy MA754 at low oxidation potential

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074884 ◽

1983 ◽

Vol 41 ◽

pp. 218-219

Author(s):

D. N. Braski ◽

P. D. Goodell ◽

J. V. Cathcart ◽

R. H. Kane

Keyword(s):

Surface Layer ◽

Oxidation Potential ◽

Metal Interface ◽

Elevated Temperature Strength ◽

Surface Conditions ◽

Inconel Alloy ◽

Inco Alloy ◽

Resistance To Oxidation ◽

Oxide Particles ◽

Cold Worked

It has been known for some time that the addition of small oxide particles to an 80 Ni—20 Cr alloy not only increases its elevated-temperature strength, but also markedly improves its resistance to oxidation. The mechanism by which the oxide dispersoid enhances the oxidation resistance is being studied collaboratively by ORNL and INCO Alloy Products Company.Initial experiments were performed using INCONEL alloy MA754, which is nominally: 78 Ni, 20 Cr, 0.05 C, 0.3 Al, 0.5 Ti, 1.0 Fe, and 0.6 Y2O3 (wt %).Small disks (3 mm diam × 0.38 mm thick) were cut from MA754 plate stock and prepared with two different surface conditions. The first was prepared by mechanically polishing one side of a disk through 0.5 μm diamond on a syntron polisher while the second used an additional sulfuric acid-methanol electropolishing treatment to remove the cold-worked surface layer. Disks having both surface treatments were oxidized in a radiantly heated furnace for 30 s at 1000°C. Three different environments were investigated: hydrogen with nominal dew points of 0°C, —25°C, and —55°C. The oxide particles and films were examined in TEM by using extraction replicas (carbon) and by backpolishing to the oxide/metal interface. The particles were analyzed by EDS and SAD.

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