Composite Acoustic Properties

Composite Materials and Measurement of Their Acoustic Properties A composite material consists of two or more materials and its optimum acoustic properties can be designed by selecting its constituents. Unidirectional composite materials have a very low transverse Poisson's ratio of less than 0.1. By considering such composite material features, the applications of carbon fiber-epoxy and...

Investigating the acoustical properties of carbon fiber, glass ... - arXiv Wood is one of the main materials used for making musical instruments due to its outstanding acoustical properties. Despite such unique properties, its inferior mechanical properties, moisture sensitivity, and time- and cost-consuming procedure for making instruments in comparison with other materials (e.g., composites).

Mechanic and Acoustic Properties of the Sound-Absorbing Material ... Dec 31, 2014 ... Abstract. A sound-absorbing composite material made of wood fiber and polyester fiber was produced using polyester foam technology and wood-based composite technology. This study investigated the physical and mechanical properties and the effects of the airflow resistivity of the materials and the...

Acoustic Absorption of Natural Fiber Composites - Hindawi Apr 17, 2016 ... Due to their biodegradable, lightweight, cheaper, nontoxic, and nonabrasive qualities, natural fibers are receiving much attention in composites as a substitute for synthetic fibers for acoustic absorption purposes. The natural fibers with desirable physical and mechanical properties are exhibited as high...

Enhanced acoustic insulation properties of composite metamaterials ... Moreover, the use of composite layered materials in the transport industry is becoming more important due to the need for designing and manufacturing lightweight, energy efficient products. Despite their superior structural characteristics, composite structures exhibit inferior dynamic and acoustic performance levels...

Acoustic characteristics of composite materials as acoustic window ... This paper described a method for estimating the acoustic characteristics of composite materials at oblique incidence of sound waves. Composite materials are used as acoustic windows of SONAR to protect the internal sensors and electronic parts from water. In this study the composite material of glass reinforced plastic...

Acoustic properties of particle/polymer composites for ultrasonic ... IEEE Trans Ultrason Ferroelectr Freq Control. 1990;37(6):506-14. Acoustic properties of particle/polymer composites for ultrasonic transducer backing applications. Grewe MG(1), Gururaja TR, Shrout TR, Newnham RE. Author information: (1)Hewlett-Packard, Andover, MA. The acoustic impedance and attenuation in...

Sound transmission properties assisted by the ... - AIP Publishing II. SOUND TRANSMISSION PROPERTIES OF THE COMPOSITE GRATING. To investigate the sound transmission properties of an acoustic grating with a periodic unit of one triangular slit and one rectangular slit, we considered a...

Sound transmission properties assisted by the ... - AIP Publishing The triangular slit showed special properties in generating enhanced phase resonance and in restraining sound transmission. By adjusting the triangular slit's opening, we could regulate the frequency and sound transmission at phase resonance. These features of the composite grating can be used in designing acoustic...

Sound absorption properties of composite structure with activated ... Activated carbon fiber felts made from viscose fiber mats were prepared and later combined with perforated panels to form four different composite sound absorption structures. Based on the transfer function method, the impedance tube was used to test the sound absorption coefficients of composite structure in an acoustic...