Active sonar discrimination of water‐column objects from bottom clutter using waveguide invariant modeling of distributed backscatter

2008 ◽  
Vol 123 (5) ◽  
pp. 3596-3596
Author(s):  
Jeffrey Krolik ◽  
Ryan Goldhahn ◽  
Granger Hickman
Keyword(s):  
Water Column ◽  
Active Sonar ◽  
Waveguide Invariant

Waveguide invariant minimum variance scatterer depth classification for active sonar.

2010 ◽  
Vol 127 (3) ◽  
pp. 2043-2043
Author(s):  
Ryan Goldhahn ◽  
Granger Hickman ◽  
Jeffrey Krolik
Keyword(s):  
Minimum Variance ◽  
Active Sonar ◽  
Waveguide Invariant ◽  
Depth Classification

Environmentally tolerant waveguide‐invariant target depth classification for active sonar.

2010 ◽  
Vol 128 (4) ◽  
pp. 2433-2433
Author(s):  
Ryan Goldhahn ◽  
Peter Nielson ◽  
Jeffrey Krolik
Keyword(s):  
Active Sonar ◽  
Waveguide Invariant ◽  
Depth Classification ◽  
Target Depth

Exploiting waveguide invariant reverberation striations for improved active sonar detection and classification

2007 ◽  
Vol 121 (5) ◽  
pp. 3172-3172
Author(s):  
Ryan Goldhahn ◽  
Jeff Rogers ◽  
Granger Hickman ◽  
Jeffrey Krolik
Keyword(s):  
Active Sonar ◽  
Waveguide Invariant

Comparison of the performance of oscillating water column devices based on arrangements of water columns

2020 ◽  
Vol 14 (3) ◽  
pp. 7082-7093
Author(s):  
Jahirwan Ut Jasron ◽  
Sudjito Soeparmani ◽  
Lilis Yuliati ◽  
Djarot B. Darmadi
Keyword(s):  
Wave Propagation ◽  
Water Column ◽  
Water Depth ◽  
Graphical Form ◽  
Wave Power ◽  
Oscillating Water Column ◽  
Power Absorption ◽  
Water Columns ◽  
Single Column ◽  
Parallel Arrangement

The hydrodynamic performance of oscillating water column (OWC) depends on the depth of the water, the size of the water column and its arrangement, which affects the oscillation of the water surface in the column. An experimental method was conducted by testing 4 water depths with wave periods of 1-3 s. All data recorded by the sensor is then processed and presented in graphical form. The research focused on analyzing the difference in wave power absorption capabilities of the three geometric types of OWC based on arrangements of water columns. The OWC devices designed as single water column, the double water column in a series arrangement which was perpendicular to the direction of wave propagation, and double water column in which the arrangement of columns was parallel to the direction of wave propagation. This paper discussed several factors affecting the amount of power absorbed by the device. The factors are the ratio of water depth in its relation to wavelength (kh) and the inlet openings ratio (c/h) of the devices. The test results show that if the water depth increases in the range of kh 0.7 to 0.9, then the performance of the double chamber oscillating water column (DCOWC) device is better than the single chamber oscillating water column (SCOWC) device with maximum efficiency for the parallel arrangement 22,4%, series arrangement 20.8% and single column 20.7%. However, when referring to c/h, the maximum energy absorption efficiency for a single column is 27.7%, double column series arrangement is 23.2%, and double column parallel arrangement is 29.5%. Based on the results of the analysis, DCOWC devices in parallel arrangement showed the ability to absorb better wave power in a broader range of wave frequencies. The best wave of power absorption in the three testing models occurred in the wave period T = 1.3 seconds.

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