Diagnóstico numérico em embarcações de atendimento de atendimento médico-hospitalar visando à otimização vibro-acústica

Abstract

The use of vessels for hospital care has been one of the main means used by some prefectures belonging to the states of the Legal Amazon to take medical and dental care to communities located in distant locations. These vessels were named by the Ministry of Health of Basic Units of Fluvial Health (UBSF). The design of these units, however, is differentiated in many ways, since it provides for the installation of equipment not present in other conventional vessels. In addition, the service performed in these units requires satisfactory acoustic-vibro-conditions so that health professionals can perform the procedures correctly. This work aims to perform a numerical analysis through the Finite Element Method to evaluate the modal and acoustic properties of the medical service vessel. The work contemplated two analyzes: modal and acoustic. In the modal analysis, the axis, propeller and the structure of the UBSF were considered as objects of study, as these are the main sources of excitation. The acoustic analysis sought to ascertain the main sources of noise emission and its propagation within the UBSF. In this second analysis, it was possible to predict the overall sound pressure level and octave bands inside the vessel. The Ansys and Comsol softwares were used for the modal and acoustic analysis, respectively. After the analyzes, the data obtained with the main national and international standards related to the subject were compared. The results found in this study demonstrated that the reference model proposed by the Ministry of Health did not meet the criteria established by the norms. It is proposed, therefore, as solutions to attenuate the undesired effects from the acoustic-acoustic phenomena, the use of materials with absorptive properties and increase in the structural rigidity of the vessel. Such measures would allow users and crew members to improve the comfort and conditions of basic health care services.