Nowadays, comfort is becoming the principal goal for designers. But what does onboard comfort really mean? It is possible to define it as a sense of physical or psychological ease, often characterized as a lack of hardship, and it is therefore a subjective sensation. In fact, the perception of a comfort condition is due to a complex mechanism in which the different senses are involved and interact with each other. When trying to improve the comfort onboard, it should be considered that the interaction between the surrounding environment and the people on board is realized through the perception of stimuli related to hearing (noise), smell, breathing and transpiration (air quality and temperature), the sight (aspect of the environment), physical contact (vibration) and the sensation of movement of the body in space (ship motions). Until now, the most important Classification Societies impose severe rules and regulations only for the evaluation of noise and vibration maximum levels for different zones of the ship. Many other aspects that influence the comfort on board are currently under study. The incentive to provide the market with more comfortable products gave rise to high awareness for the analysis of sound transmission and absorption of the main materials used in shipbuilding. There are two driving parameters to describe the behavior of sound absorber materials: Transmission Loss (TL) and Insertion Loss (IL). In case of metals, with particular reference to steel, it is well known that the internal damping is very low. In contrast, there are so-called viscoelastic materials, which show high dissipation of mechanical energy. In this paper, a measurement campaign in real scale, carried out to investigate the dynamic behavior of different materials used to absorb vibration and sound propagating through steel decks, is described. During the tests, a comparison of velocity level measured under the naked metal plate obtained from experimental data and from finite element analyses has been carried out. Furthermore, the TL and IL values of the four different floor configurations obtained from experimental data are compared to understand which type of floor shows the best damping behavior.
Experimental and numerical analysis of absorber materials for steel decks
Pais T.;Boote D.;Kaeding P.
2016-01-01
Abstract
Nowadays, comfort is becoming the principal goal for designers. But what does onboard comfort really mean? It is possible to define it as a sense of physical or psychological ease, often characterized as a lack of hardship, and it is therefore a subjective sensation. In fact, the perception of a comfort condition is due to a complex mechanism in which the different senses are involved and interact with each other. When trying to improve the comfort onboard, it should be considered that the interaction between the surrounding environment and the people on board is realized through the perception of stimuli related to hearing (noise), smell, breathing and transpiration (air quality and temperature), the sight (aspect of the environment), physical contact (vibration) and the sensation of movement of the body in space (ship motions). Until now, the most important Classification Societies impose severe rules and regulations only for the evaluation of noise and vibration maximum levels for different zones of the ship. Many other aspects that influence the comfort on board are currently under study. The incentive to provide the market with more comfortable products gave rise to high awareness for the analysis of sound transmission and absorption of the main materials used in shipbuilding. There are two driving parameters to describe the behavior of sound absorber materials: Transmission Loss (TL) and Insertion Loss (IL). In case of metals, with particular reference to steel, it is well known that the internal damping is very low. In contrast, there are so-called viscoelastic materials, which show high dissipation of mechanical energy. In this paper, a measurement campaign in real scale, carried out to investigate the dynamic behavior of different materials used to absorb vibration and sound propagating through steel decks, is described. During the tests, a comparison of velocity level measured under the naked metal plate obtained from experimental data and from finite element analyses has been carried out. Furthermore, the TL and IL values of the four different floor configurations obtained from experimental data are compared to understand which type of floor shows the best damping behavior.
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