Design Review #2 - Columbia University

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Table of ContentsShadow IncorporatedDesign Review #2Introduction................................................................................................................................................. 3Specifications.............................................................................................................................................. 4Risk Analysis .............................................................................................................................................. 5Parameter Analysis ..................................................................................................................................... 7Final Design................................................................................................................................................ 8Product Operation ................................................................................................................................... 8Components ............................................................................................................................................ 9Thrust Calculations ............................................................................................................................... 10Drawings & Calculations...................................................................................................................... 10Information Sources:................................................................................................................................. 11
Shadow IncorporatedDesign Review #2IntroductionShadow Incorporated has created a product concept to help open water swimmers around theworld. Within the span of one semester, this team will create a working prototype model that can beaccurately tested and used as a foundation for further design. The creation, an autonomous boat thatfollows a swimmer in open water, can later be modified and enhanced in several ways. In terms ofmarketability, this product is quite useful and highly desirable. Currently, open water swimmers musteither tie a buoy to their bodies while swimming under water, or hire a boatman to stay within a certainspecified range of the swimmer to notify boats of his or her presence under water.The main criterion of Shadow Inc.’s product is to be able to follow a swimmer wearing atracking device, while maintaining stability and holding up a regulation sized flag. Features that canlater be added once this model is working include a GPS system to mark the exact location of theswimmer, and a radio system to notify nearby boats via special signal. These ideas can be worked ontothe system following preliminary testing and operation.Rigorous patent searches have not found any products that mimic the design of this product, orany existing products for autonomously following a swimmer. Based on this search, Shadow Inc. ishighly confident that this product is marketable and desirable.Product Conception:Boat & Hull Design: The boat will be prototyped before any final design is settled on. The boat’ssize and shape are constrained primarily by the size and weight of the electrical components that it mustcarry, including the battery, microcomputer, dc motors, resistors, and op-amps, as well as byhydrodynamic criteria that it must meet. The boat must be capable of withstanding the weight and dragforces placed on it by the regulation flag that it will bear, as well as the drag of the water’s current, andbe able to maneuver with considerable accuracy. Thus, stability and maneuverability are the two mainfocuses when considering the hull design. Stability is the more vital of the two. A catamaran offersoptimum stability. The boat will be equipped with two propellers attached to two separate dc motors.Having the two propellers, as opposed to just one with a rudder, eliminates the need for a stepper motor,and simplifies the controls quite significantly. With two motors, both motors can simply be turned onwhen the target is directly in front of the boat, and then the speeds of each motor can be varied when theboat needs to be turned in any particular direction.Signal Processing: The swimmer, or target, will carry a transmitter that will send out anultrasonic pulse every x number of seconds. Those signals will, in turn be received by two sensors on
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Design Review #2 - Columbia University

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