The aspiration unit of a domestic cleaning appliance is one of the most noisy appliance used in homes. The complex combination of noises which have various origins requires a detailed acoustic characterization, aimed to finding the type of the issued components in order to suggest potential improvement solutions. The levels of sound power derived from the various operating velocities of the cleaning appliance were firstly evaluated by means of acoustic pressure measurements. The appliance was analysed in different configurations according to the measurement procedures foreseen by the UNI EN ISO 3744 standard. This kind of analysis was carried out in order to isolate the contribution given by the various elements. In order to further detail the acoustic characterization of the cleaning appliance and to verify if there are discreet noise tones at specific frequencies, a narrow band analysis was carried out. The analysis allowed to identify various typologies of source noise such as the aerodynamic contribution of the air flux inside the pipes and the generation of noise due to the rotation of the coupled blades on the rotor. Mechanical noise sources are also present, due to the friction of the brushes, the bearings and the unbalanced masses; finally periodical fluctuations of the magnetic field between the stator and the rotor causes the electromagnetic noise. The detailed study on the appliance and the research in Literature allowed to suggest potential improvement solutions for noise reduction.
Experimental acoustic characterization of a wet vacuum cleaner
BURATTI, Cinzia;MORETTI, ELISA;URBANI, MICHELE
2009
Abstract
The aspiration unit of a domestic cleaning appliance is one of the most noisy appliance used in homes. The complex combination of noises which have various origins requires a detailed acoustic characterization, aimed to finding the type of the issued components in order to suggest potential improvement solutions. The levels of sound power derived from the various operating velocities of the cleaning appliance were firstly evaluated by means of acoustic pressure measurements. The appliance was analysed in different configurations according to the measurement procedures foreseen by the UNI EN ISO 3744 standard. This kind of analysis was carried out in order to isolate the contribution given by the various elements. In order to further detail the acoustic characterization of the cleaning appliance and to verify if there are discreet noise tones at specific frequencies, a narrow band analysis was carried out. The analysis allowed to identify various typologies of source noise such as the aerodynamic contribution of the air flux inside the pipes and the generation of noise due to the rotation of the coupled blades on the rotor. Mechanical noise sources are also present, due to the friction of the brushes, the bearings and the unbalanced masses; finally periodical fluctuations of the magnetic field between the stator and the rotor causes the electromagnetic noise. The detailed study on the appliance and the research in Literature allowed to suggest potential improvement solutions for noise reduction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
