Browsing by Author "Caraboni Burgos, Franco Paolo"

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    Diseño de un banco de ensayo para hélices de barco.
    (Universidad de Concepción, 2024) Caraboni Burgos, Franco Paolo; Tinapp Dautzenberg, Frank Joachim
    The course "Integration through CDIO", offered to Aerospace and Mechanical Engineering students, aims to apply engineering knowledge acquired to date in the construction of a cargo ship. This ship must be conceived, designed, implemented, and operated to fulfill a mission, focusing on optimizing the time required to complete it, the cargo capacity, and associated costs. Currently, the propulsion system to be used is not chosen based on any specific criterion. This need drives the design of a test bench to compare propulsion systems through thrust and electrical consumption measures of propeller-motor combinations. The test bench is developed follows the CDIO methodology. It is conceived that the test bench will measure thrust produced, voltage and current consumed, and RPM of the transmission shaft. Additionally, it must be submersible in water, so a watertight seal is designed for the transmission shaft exit. In the design phase, the measurement system and connections are planned, and CAD models of the test bench are created to later be machined using a CNC milling machine. The watertight seal is designed too. During the implementation phase, the test bench is manufactured, assembled, leveled horizontally, and installed in the test channel for operation. Sensor calibration is performed. A RPM control system and Arduino code is developed. Modifications are made to the bench and its systems to address limitations encountered during this phase. Through a stability analysis of floating bodies, it was verified that the test bench has stable flotation as its metacenter is above its center of gravity. Two propellers with 80 [mm] pitch and Ø55 y Ø52 [mm] are tested using a 100 [W] direct current motor to compare their performance. There is noise in the measurements, but a trend is observed that responds to variations of power delivered to the motor. Using comparison criteria, it is concluded that, although both propellers consume similar power during tests, the larger diameter propeller has greater capacity to produce thrust than the Ø52 [mm] one, under similar operating conditions. The precision of measurements depends on correct leveling. With the test bench implemented, operational and validated, the proposed work objectives are met, and the need to select a propeller – motor propulsion system based on its performance in the "Integration through CDIO" course, is fulfilled.
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