Mr. Robert M. Shydo Profile

Robert M. Shydo

Vice President at Ithaca Mechanical Systems Inc

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Proceedings Article | 5 May 2005 Paper

A remotely activated SMA actuated naval tie-down system

Robert Shydo, Ephrahim Garcia, Jason Harris

Proceedings Volume 5762, (2005) https://doi.org/10.1117/12.607299

KEYWORDS: Actuators, Shape memory alloys, Prototyping, Content addressable memory, Packaging, Transmitters, Manufacturing, Finite element methods, Commercial off the shelf technology, Metals

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The goal of this effort was to design and prototype on advanced tie down system for the restraint of M1A1 tanks on Naval Hovercrafts. The ties were required to restrain 35,000 lbs of tensile load, interface with current craft hardware and electrical systems, as well as provide increased ease of operation as compared to current ties. The new ties were designed to accommodate the force and displacement constraints of shape memory alloy actuators, the strength of support materials, shape limitations of the assembled system, and the power limitations of energy storage and transmission devices. These tasks included the design of numerical simulations, FEA models, and plastic rapid prototypes. The functional prototype utilizes wire based SMA actuators with superelastic spring actuated power-off re-tensioning. The system was designed to utilize energy stored in batteries released remotely via RF signals provided by COT transmitters and receivers. Switching was accomplished utilizing specially designed MOSFET arrays with provisions for PWM power modulation under full SMA contraction. The system was also designed to use advanced synthetic fiber webbing as tension materials to reduce overall system weight and size.

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