Sharp Arnold G.

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DSRV Alvin weight report : 1975

(Woods Hole Oceanographic Institution, 1975-10) Sharp, Arnold G.

Weight and stability information has been updated for the research submarine ALVIN for 1975. The report includes results of the computations programmed for the Institution's XDS Sigma-7 computer, observed values resulting from the tethered trim dive and inclining experiments, and miscellaneous stability calculations. principal results are the weight, displacement, and longitudinal and vertical components of the BG and GM distances, for the complete submersible, and for various major sub-assemblies.
DSRV Alvin weight report : 1976

(Woods Hole Oceanographic Institution, 1976-12) Sharp, Arnold G.

Weight and stability information is presented for the research submarine ALVIN for 1976, The report consists primarily of the results of the computations programmed for the Woods Hole Oceanographic Institution's XDS Sigma 7 computer. structural and weight changes to the vehicle have been minimal since the 1975 operating season. Therefore, no inclining experiments were preformed in 1976. Prinicpal results are the weight, displacements, and longitudinal and vertical components of the BG distance, for the complete submersible and for various major subassemblies.
DSRV Alvin weight report : 1972

(Woods Hole Oceanographic Institution, 1972-12) Sharp, Arnold G. ; Eliason, Andrew H.

Complete weight and stability computations are presented for the research submarine ALVIN for the year 1972. Longitudinal and vertical components of the BG distance are shown for the vehicle in its normal submerged condition, for the vehicle with the large rock drill attached and then released, and for a number of vehicle emergency conditions. Calculations for pounds per inch immersion and moment to trim one degree also are included. Results of the tethered trim dive are presented and discussed.
Design and manufacture of new emergency hull release for Alvin

(Woods Hole Oceanographic Institution, 1965-08) Mavor, James W. ; Sharp, Arnold G.

The emergency hull release of ALVIN was redesigned in an effort to reduce shaft bending stress and to eliminate galling of contacting surfaces. new design features quarter-turn cam on unthreaded shaft instead of eight-turn threaded shaft of original device. major components are made of Monel K-500 and phosphor bronze inserts used at points of high contact stress.
Design curves for oceanographic pressure-resistant housings

(Woods Hole Oceanographic Institution, 1981-08) Sharp, Arnold G.

Curves have been prepared to serve as a guide in designing externally pressurized cylindrical and spherical housings and flat end closures. The plots show wall thickness-to-diameter ratio as a function of collapse depth over the range 0-10,000 meters (0-32,800 feet). Curves are plotted for the commonly used stainless steels and aluminum and titanium alloys. Also, there are three dimensionless curves that can be used for any structural material. Included is a brief review of the equations used in plotting the curves.
Alvin titanium electrical penetrator design, manufacture, and testing : interim report

(Woods Hole Oceanographic Institution, 1976-05) Sharp, Arnold G. ; Walden, Barrie B. ; Hosom, David S.

Under the U.S. Navy's Project TITANES a new titanium alloy pressure hull has been designed, built, and installed for use in the deep-submersible ALVIN. The Woods Hole Oceanographic Institution was assigned the task of designing, procuring and testing the through-hull electrical penetrators for the new sphere. This interim report traces the progress of this Woods Hole program from the initial design stage, through the various phases of manufacture and electrical testing, to the installation of the units in the completed hull, and the numerous laboratory~ pressure tank, and at-sea tests conducted to verify the satisfactory performance of the new penetrators. The results of all laboratory and in-service testing done to date support the conclusion that the performance of the titanium penetrators meets all of the original specifications.
Weight and stability of DSRV Alvin : 1978

(Woods Hole Oceanographic Institution, 1978-10) Sharp, Arnold G.

The ALVIN weight and stability report for 1978 contains the usual programmed computations covering the normal submerged and normal surfaced vehicle configurations as well as a number of emergency conditions. Weight and stability figures also are reported for major vehicle subassemblies. Because of important structural modifications to ALVIN during the 1977-78 overhaul period the surface and submerged inclining experiments were conducted at the end of that period. The usual tethered trim dive also was preformed and the results of these experiments are reported.
DSRV ALVIN : a review of accomplishments

(Woods Hole Oceanographic Institution, 1977-01) Sharp, Arnold G. ; Shumaker, Lawrence A.

ALVIN, a deep-submergence oceanographic research submarine, is owned by the Office of Naval Research of the U.S. Navy and operated by the Woods Hole Oceanographic Institution (W.H.O.I). Completed in 1964, it began routine diving for scientific research in 1966. Since that time the submersible has made over 650 dives in many areas of the Atlantic Ocean including the Azores, Spain, the Bahamas, the Straits of Florida and the Gulf of Maine. Many of the dives have been for vehicle test and training purposes, and a significant number have been required by the U.S. navy for various engineering and salvage operations. These activities are summarized briefly and a short list of related Navy reports is given. Extensive engineering research and development in support of the ALVIN project has been provided by personnel from W.H.O.I., U.S. navy laboratories and private industry. Over 100 technical reports and papers have been produced as part of their effort and they are listed here. Nearly 300 dives have been competed for purely scientific purposes. These latter dives are described briefly in chronological order, and a list of 92 of the resulting scientific publications is presented.
Weight, buoyancy and stabiltiy of DSRV Alvin, 1967

(Woods Hole Oceanographic Institution, 1968-01) Sharp, Arnold G. ; Winget, Clifford L.

A complete weight and stability analysis for the research submarine ALVIN is presented. Weights, displacements, locations of center of gravity and center of buoyancy, and longitudinal and vertical components of the BG distance are given for the submarine in its normal condition, and in a number of emergency conditions. A computer program was set up for this purpose and results were obtained using the WHOI computer. The metacentric height GM was calculated using a semi-graphical method. Some of the results obtained in the ALVIN dockside trials are included. Experimentally determined values of BG and GM are compared with the computed values.
Experimental stress analysis of model of emergency forebody release device used in deep diving research submarines Alvin, Sea Cliff and Turtle

(Woods Hole Oceanographic Institution, 1969-08) Sharp, Arnold G. ; Sullivan, James R.

Tests were conducted on a full-scale model of the emergency forebody release used in the deep-diving submarines ALVIN, SEA CLIFF and TURTLE. The model was machined from metal to the same dimensional tolerances as the prototype. Resistance strain gages, attached to the model, permitted measurement of forces on component parts of the device. Of primary concern was the bending stress which might be set up in the release operating shaft when the submarine is submerged in an inclined position. Tests were arranged to simulate three possible conditions of loading of the release device at a 30 degree vehicle list angle: case (1) righting moment of inclined forebody resisted by release components only; case (2) righting moment resisted by release with assistance from lower guides; and (3) righting moment resisted by couple set up by release and rubber support ring. Test results show that shaft bending stresses (for ALVIN) are high (200,000 psi) for the case (1) condition, lower (400,000 - 90,000 psi) for case (2) and essentially zero for case (3). The conclusion is that the present forebody release design is adequate for all submarine attitudes encountered in normal operation, provided the vehicle has been assembled so that contact between sphere and rubber ring is assured at all times.
DSRV Alvin weight report : 1971

(Woods Hole Oceanographic Institution, 1971-08) Sharp, Arnold G. ; Winget, Clifford L. ; Eliason, Andrew H.

Complete weight and stability calculations are presented for the newly rebuilt research submarine ALVIN. Longitudinal and vertical components of the BG distance are given for the vehicle in its normal condition, and in a number of emergency conditions. Some of the post-refit certification trials also are described and test results are given. Experimentally determined values of BG are compared with the computed values.
Torque tests of a full size model of the Alvin/AUTEC emergency sphere release

(Woods Hole Oceanographic Institution, 1970-11) Sharp, Arnold G. ; Sullivan, James R.

Laboratory torque tests were perfoirmed using an actual emergency sphere release shaft of the type used in the research submarines ALVIN, SEA CLIFF and TURTLE. A test fixture was constructed which permitted laboratory simulation of the side (squeezing) forces applied to the release shaft came as a result of forebody buoyancy. Estimated full-scale side forces were applied to the cam by a laboratory compression testing machine, and the torque required to rotate the shaft was measured. Tests were run with contacting surfaces (a) clean and dry, (b) greased, and (c) immersed in sea water. From the test results, values of release torque were calculated for the submarines in question. Coefficient of friction values of the contrating materials (Monel K-500 on phosphor bronze) also are reported.
A pendulum inclinometer for use with small deep-submersibles

(Woods Hole Oceanographic Institution, 1976-09) Sharp, Arnold G. ; Sullivan, James R.

The authors developed a pendulum inclinometer suitable for use with small deepsubmersibles or surface craft. The instrument uses a relatively short heavy pendulum and a viscous damping system for minimizing the effects of unwanted oscilatory motion. The pendulum relative motion is transmitted to the dial pointer through a flexible cord. The mechanism is designed so that the inclinometer gives a direct reading of the tangent of the angle of inclination. Adjustments are provided for leveling the instrument and for setting the dial to zero. Upper and lower clamping devices protect the pendulum suspension from damage during transit. The inclinometer has been used successfully in recent inclining experiments for the small research submarine Alvin.
DSRV Alvin weight report : 1974

(Woods Hole Oceanographic Institution, 1974-12) Sharp, Arnold G.

Weight and stability computations are presented for the research submarine ALVIN for the year 1974. Longitudinal and vertical components of the BG distance are shown for the vehicle in its normal submerged condition, and for a number of vehicle emergency conditions. Calculations for pounds per inch immersion and moment to heel one degree also are included.
DSRV Alvin weight report, 1973

(Woods Hole Oceanographic Institution, 1973-12) Sharp, Arnold G. ; Doherty, Kenneth W.

Weight and stability computations are presented for the research submarine ALVIN following the installation, early in 1973, of the new titanium alloy pressure hull built by the U.S. navy under "Project Titanes." Longitudinal and vertical components of the BG distance are shown for the vehicle in its normal submerged condition, and for a number of emergency conditions. Calculations for pounds per inch immersion and moment to heel one degree also are included. results of the post-refit dockside trials are presented and discussed.
Tests of propellers for Alvin side propulsion units

(Woods Hole Oceanographic Institution, 1967-07) Sharp, Arnold G. ; Sullivan, James R.

Full scale dynamometer tests were run on a series of unshrouded propellers in the range of propeller diameters considered practical for use on the side propulsion units of the research submarine ALVIN. Measurements taken included static thrust, torque, and RPM for various values of hydraulic power input to the driving motor. In other tests, propellers having 14 inch diameter and 20 inch pitch (the present ALVIN configuration) were compared for static thrust as follows: conventional blade shape, unshrouded; conventional blade shape in ALVIN flow-accelerating nozzle unit; square-ended blades in ALVIN nozzle unit. Recommendations are given concerning the proposed new ALVIN side propulsion units.

Sharp Arnold G.

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