DYNAMIC MATERIALS PROPERTIES, REFRIGERATOR COMPARTMENT
The dynamic properties of materials are important parameters for numerical vibro-acoustics analysis of a household refrigerator. The compartment of a household refrigerator is typically composed by three types of materials: hot rolled steel, polyurethane rigid foam (PUR) and high impact polystyrene (HIPS). In this work, the mechanical properties (dynamical Young‟s modulus and loss factor) of these materials were determinate in order to comprehend its frequency-dependent behavior to use them properly in vibro-acoustic numerical models of household refrigerators. Experimental procedures based in impulsive responses of beams were performed for each material. Moreover, numerical models were used to fit the polyurethane rigid foam properties to experimental data. Finally, a numerical model of “sandwich” beam was built using the obtained properties. The results were compared with experimental tests performed on “sandwich” beam specimen from a refrigerator compartment. Good agreement was found for frequencies between 0 Hz to 600Hz.