Graduate Thesis Or Dissertation
 

Design and analysis of a high speed dynamic tow carriage

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nk322h171

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  • A need exists to develop a high speed dynamic tow carriage used to motivate hydrodynamic specimens through a fluid environment. It is desired to simulate high Reynolds number unsteady flow about the specimen by towing the specimen through the fluid. The fluid environment is to be provided by the existing uni-directional wave tank at O.H. Hinsdale Wave Research Laboratory at Oregon State University. This paper is both a feasibility study and a conceptual design of the dynamic tow carriage. The first part of this paper develops a first order theoretical model of the dynamic tow carriage. The model has four main components, 1) the carriage/specimen model, 2) the wire rope model, 3) the idler pulley model, and 4) the driver pulley model. The carriage/specimen is modeled as a large point mass with viscous damping. Power is input to the driver pulley which transfers the power to the wire rope. The wire rope is modeled as linear springs with discretized mass and structural damping. The wire rope then transfers power to the carriage/specimen to propel it along the length of the wave tank. The second half of this paper develops a conceptual design of the system. Theoretical results from the system model are interpreted and used for design parameters for each component of the real system. The carriage/specimen structure is a 5.5 m long 3.7 m wide light weight yet rigid space frame made of aluminum tubing. This component was designed using finite element techniques for both a static and vibrational analysis. The carriage is supported and guided by rigid linear motion bearings that nearly span the length of the wave tank. Power is supplied by a 400 kW hydrostatic drive to a 1.5 m diameter driver drum with enough stored cable to pull the carriage through 60 m oscillations. The analysis and design suggest that the 1000 Kg carriage/specimen structure can be driven to velocities exceeding 17 m/s and accelerations on the order of gravity. For cylindrical tow specimens having a length of 3.4 m and a diameter ranging from 2 to 600 mm a maximum Reynolds number equal to 4x10⁶ and Kuelegan Carpenter parameter equal to 8x10³ appear feasible.
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