. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography General Design Considerations The design of the measurement and control system involved consideration of certain factors above the purely technical problems related to task accomplishment. The primary factor was low cost. In addition, the system and its components were to be physically rugged, simple to operate and troubleshoot, and the elements were to be, as far as possible, off- the-shelf units available at the nearest elec- tronic supply house.
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography General Design Considerations The design of the measurement and control system involved consideration of certain factors above the purely technical problems related to task accomplishment. The primary factor was low cost. In addition, the system and its components were to be physically rugged, simple to operate and troubleshoot, and the elements were to be, as far as possible, off- the-shelf units available at the nearest elec- tronic supply house. The same philosophy controlled the mechanical design of the structure which carried the vane shear measuring apparatus to the bottom (Fig. 1); its height was sufficient to accommodate J Top Plate Torque Assembly Bose Plate. Drive Gear Assembly // Vone Footing Fig. 1 Simplified Drawing of Vane Shear Strength Equipment the 3 m vane rod when retracted and it was also short enough to permit handling by cranes aboard relatively small ships. In addition, the base was made as broad as average small - ship capabilities would permit to provide the maximum stability against overturning while on the bottom. The tower was mainly fabricated of 6061-T651 aluminum with minor amounts of stainless steel. All components of the tower, with the exception of three long threaded drive rods, could be fabricated or repaired in any normally equipped machine shop. The mechanical system was constructed in such a way that a shaft rotation would produce penetration of a vane and vane rod into the sea-bed upon which the tower rested. Reverse rotation of the same shaft would retract the vane. Similarly, rotation of the second shaft would produce rotation of the vane. The task of the electrical control and measurement system was to produce controlled motions of these shafts and to measure the torque developed by the resistance of the soil on the vane. Electrical System Design Selections The system requi
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