The operative behaviour of a structure in a specific environment provides a valuable opportunity to gather significant data about the working conditions useful for further analysis and design optimization. The current study focuses on the analysis of the modal behaviour of a racing boat cockpit, made of 5000 series aluminium alloy frame. The racing boat is a green catamaran with an overall length of 5 m and a breadth of 3 m, equipped with a three-phase electrical motor with a nominal power of 15 kW, supplied by a 9.4 kWh lithium-ion traction battery with 811 NMC cells model N18650CP. The boat is equipped with a 48 V – 280 Wh telemetry battery to supply onboard sensors (vibrations, batteries temperatures, GPS position, boat velocity, voltage and current of batteries) and the data transmission system based on a MQTT communication protocol. Telemetry battery comprehends a buck DC/DC converter 48-12 V useful to supply the pilot display. The aluminium frame modal parameters (resonance frequencies and mode shapes) were predicted by means of a numerical Finite Element Model and then validated through an Experimental Modal Analysis performed in laboratory conditions. Torsional, flexural and transversal modes were identified. Moreover, an Operative Modal Analysis was carried out during sea trials in the Strait of Messina in order to verify the sea-induced vibrations in operative conditions. The study, based on both numerical, laboratory and operative tests, seeks to acquire useful information about the vibrational behaviour of the catamaran, useful to optimize the design to enhance race performances.
Modal Analysis of a Catamaran Cockpit: Numerical Models, Experimental Tests and Sea Trials
Briguglio G.;Crupi V.;Distefano F.;Freni F.;Montanini R.
2025-01-01
Abstract
The operative behaviour of a structure in a specific environment provides a valuable opportunity to gather significant data about the working conditions useful for further analysis and design optimization. The current study focuses on the analysis of the modal behaviour of a racing boat cockpit, made of 5000 series aluminium alloy frame. The racing boat is a green catamaran with an overall length of 5 m and a breadth of 3 m, equipped with a three-phase electrical motor with a nominal power of 15 kW, supplied by a 9.4 kWh lithium-ion traction battery with 811 NMC cells model N18650CP. The boat is equipped with a 48 V – 280 Wh telemetry battery to supply onboard sensors (vibrations, batteries temperatures, GPS position, boat velocity, voltage and current of batteries) and the data transmission system based on a MQTT communication protocol. Telemetry battery comprehends a buck DC/DC converter 48-12 V useful to supply the pilot display. The aluminium frame modal parameters (resonance frequencies and mode shapes) were predicted by means of a numerical Finite Element Model and then validated through an Experimental Modal Analysis performed in laboratory conditions. Torsional, flexural and transversal modes were identified. Moreover, an Operative Modal Analysis was carried out during sea trials in the Strait of Messina in order to verify the sea-induced vibrations in operative conditions. The study, based on both numerical, laboratory and operative tests, seeks to acquire useful information about the vibrational behaviour of the catamaran, useful to optimize the design to enhance race performances.Pubblicazioni consigliate
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