90 research outputs found
Bio-inspired laminate design exhibiting pseudo-ductile (graceful) failure during flexural loading
Cyclic fatigue testing of surface mooring hardware for the Arabian Sea mixed layer dynamics experiment
The Arabian Sea is strongly forced by monsoon winds. Surface moorings deployed in the Arabian Sea are
exposed to high winds and large waves. The waves, generated by strong wind events, impose a dynamic load
on all mooring components. The dynamic cycling of mooring components can be so severe that ultimate
strength considerations are superseded by the fatigue properties of the standard hardware components.
Concerns about all in-line mooring components and their fatigue endurance dictated the need for an
independent series of cyclic fatigue tests. The components tested included shackles of various sizes and
configurations, wire rope, instrument cages, chain, and a variety of interconnecting links such as weldless
sling links and end links. The information gained from these tests was used in the design of the surface
moorings deployed in the Arabian Sea by the Upper Ocean Processes group of the Woods Hole Oceanographic
Institution.
The results of the cyclic fatigue tests conducted in support of the Arabian Sea surface mooring design effort
are presented in this report. Recommendations are made with regard to all in-line components for surface
moorings where dynamic conditions might be encountered for extended periods. The fatigue test results from
shackles, and sling links were compiled to generate an SIN diagram where the cyclic stress amplitude is
plotted versus the number of cycles to failure. In addition, the wire rope test results were compiled with
historical wire rope data from US steel to generate a SIN diagram for torque balanced 3x19 wire rope. These
results can be used in conjunction with
future design efforts.Funding was provided by the Office of Naval Research through
Grant No. N00014-94-1-0161
The Subduction experiment : cruise report R/V Oceanus : cruise number 240 leg 3 : subduction 1 mooring deployment cruise, 17 June-5 July 1991
Subduction is the mechanism by which water masses formed in the mixed layer and near the surface of the ocean find their way
into the upper thermocline. The subduction process and its underlying mechanisms were studied through a combination of Eulerian and
Langrangian measurements of velocity, measurements of tracer distributions and hydrographic properties and modeling.
An array of five surface moorings carrying meteorological and oceanographic instrumentation were deployed for a period of
two years beginning in June 1991 as part of an Office of Naval Research (ONR) funded Subduction experiment. Three eight month deployments were planned. The initial deployment of five surface moorings took place during the third leg of R/V Oceanus cruise number
240. The moorings were deployed at 18°N 34°W, 18°N 22°W, 25.5°N 29°W, 33°N 22°W and 33°N 34°W.
A Vector Averaging Wind Recorder (VAWR) and an Improved Meteorological Recorder (IMET) collected wind speed and
wind direction, sea surface temperature, air temperature, short wave radiation, long wave radiation, barometric pressure and relative
humidity. The IMET also measured precipitation. The moorings were heavily instrumented below the surface with Vector Measuring
Current Meters (VMCM) and single point temperature recorders.
Expendable bathythermograph (XBT) data were collected and meteorological observations were made while transitting
between moonng locations.
This report describes the work that took place during R/V Oceanus cruise 240 leg 3. It includes a description of the
instrumentation that was deployed,information about the XBT data collected and plots of the data as well as a chronology of the cruise
events.Funding was provided by the Office of Naval Research under contract N00014-90-J-1490
Mechanical and operational details of a Neil Brown Instrument Systems internally recording conductivity, temperature, depth (CTD) profiler
The purpose of this report is to discuss the use of a Neil Brown
Instrument Systems internal recording CTD. The components of the
instrument are described along with the advantages and disadvantages of
the internal recording system. Calibration of the pressure and
temperature sensors in the laboratory and the method used for in situ
calibration of the conductivity sensor is described. A step by step
description of the use of the CTD/IR at sea is also included.Prepared for the Office of Naval Research under Contract
N00014-76-C-0197; NR 083-400
Arabian Sea mixed layer dynamics experiment : mooring deployment cruise report R/V Thomas Thompson cruise number 46, 14 April-29 April 1995
This report describes in a general manner the work that took place during the R/V Thomas Thompson
cruise number 46 which was the mooring turnaround cruise for the moored array program. A detailed
description of the WHOI surface mooring and its instrumentation is provided. Information about the XBT and
CTD data and near-surface temperature data collected during the cruise is also included.Funding was provided by the Office of Naval Research through
Grant No. NOOOl4-94-1-0161
FASINEX (Frontal Air-Sea Interaction Experiment) moored instrumentation
In 1986, FASINEX, a Frontal Air-Sea Interaction Experiment,
a multi-investigator cooperative experiment, was conducted
to study the role of horizontal variability in air-sea
interaction in the persistent front formed in the
subtropical convergence zone south of Bermuda. Aimed at
investigating all aspects of the atmospheric and oceanic
variables related to the formation and maintenance of the
front, an array of meteorological and current meter moorings
was deployed by the Woods Hole Oceanographic Institution
Buoy Group in 5400 meters of water . Two subsurface current
meter moorings were deployed in October, 1984; five surface
meteorological and current meter moorings and four Profiling
Current Meter (PCM) moorings were set in January 1986 . All
except one PCM mooring, which was lost, were recovered in
June 1986. This report discusses the extensive preparations
of, and modifications to, the Woods Hole Oceanographic
Institution Buoy Group instruments placed on the five
surface moorings. The equipment included 30 vector
measuring current meters, ten vector averaging current
meters and five vector averaging wind recorders .Funding was provided by the Office of Naval Research
under contract Number N00014-84-C-0134
The Subduction experiment : cruise report R/V Oceanus cruise number 250 legs 1 and 2 subduction 2 mooring deployment and recovery cruise, 25 January-26 February 1992
Subduction is the mechanism by which water masses formed in the mixed layer and near the surface of the ocean find their way
into the upper thermocline. The subduction process and its underlying mechanisms were studied through a combination of Eulerian and
Langrangian measurements of velocity, measurements of tracer distrbutions and hydrographic propertes and modeling.
An array of five surface moorings carrying meteorological and oceanographic instrumentation were deployed for a period of
two years beginning in June 1991 as part of an Office of Naval Research (ONR) funded Subduction experiment. Three eight month
deployments were planned. The initial deployment of five surface moorings took place during the third leg of R/V Oceanus cruise number
240. The moorings were deployed at 18°N 34°W, 18°N 22°W, 25.5°N 29°W, 33°N 22°W and 33°N 34°W.
A Vector Averaging Wind Recorder (VAWR) and an Improved Meteorological Recorder (IMET) collected wind speed and
wind direction, sea surface temperature, air temperature, short wave radiation, barometric pressure and relative humidity. The IMET also
measured precipitation. The moorings were heavily instrumented below the surface with Vector Measuring Current Meters (VMCM)
and single point temperature recorders.
Expendable bathythermograph (XBT) data were collected and meteorological observations were made while transitting
between mooring locations.
This report describes the work that took place during R/V Oceanus cruise 250 which was the second scheduled Subduction
mooring cruise. During this cruise the first setting of the moorings were recovered and redeployed for a second eight month period. This
report includes a description of the instrumentation that was deployed and recovered, has information about the underway measurements
(XBT and meteorological observations) that were made including plots of the data and presents a chronology of the cruise events.Funding was provided by the Office of Naval Research under contract N00014-90-J-1490
The Subduction experiment : mooring field program and data summary ; Sub 1 June 1991-February 1992 ; Sub 2 February 1992-October 1992 ; Sub 3 October 1992-June 1993
An array of five surface moorings carrying meteorological and oceanographic instrumentation was deployed for a period of
two years beginning in June 1991 as part of an Office of Naval Research (ONR) funded Subduction experiment. Three eight month
deployments were carried out. The five mooring locations were 18°N 34°W, 18°N 22°W, 25.5°N 29°W, 33°N 22°W and 33°N 34°W.
Two Woods Hole Oceanographic Institution (WHOI) and three Scripps Institution of Oceanography (SIO) moorings
collected oceanographic and meteorological data, using a 3-meter discus or 2-meter toroid buoy and multiple Vector Measuring
Current Meters (VMCMs), an Acoustic Doppler Current Profiler (ADCP) and Brancker temperature recorders (tpods). The surface
buoys carried a Vector Averaging Wind Recorder (VAWR) and, on four of the five moorings, an Improved Meteorological Recorder
(IMET) which measured wind speed and wind direction, sea surface temperature, air temperature, short wave radiation,
barometric pressure and relative humidity. The IMET also measured precipitation. The VMCMs, ADCP and tpods, placed at depths
1 m to 3500 m, measured oceanic velocities and temperatures.
This report presents meteorological and oceanographic data from the WHOI Upper Ocean Processes Group (UOP) and the
SIO Instrument and Development Group (lDG) instruments and contains summaries of the instruments used, their depths, mooring
positions, mooring deployment and recovery times, and data return. Appendices contain information on supplementary Subduction
data sets.Funding provided by the Office of Naval Research under
Contract No. N00014-90-J-1490
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