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Description
Sound insulation of mechanically coupled multilayered constructions, such as lightweight floors and walls, depends on the resiliency of line connections (a.k.a. studs or bars) which are mechanically connecting the rigid layers (boards). Typical examples are vertical or horizontal wall studs and floor or ceiling joists. The transmission of mechanical vibration reduces when the dynamic stiffness, K’, of the studs reduces. There is no standardized method of measuring K’ of resilient studs. Our purpose is to present a method for that purpose. The measurement apparatus contains a vibration exciter, two planar load masses hanging from ceiling, force and vibration transducers, and a two-channel real-time analyzer. The stud samples are mounted between the load masses. Thirty geometrically different resilient studs were measured. The profile width of studs varied from 17 to 125 mm. The resulting database includes the K’ and loss factor values of many typical stud profiles available in the market. The measured range of K’ was 0.08–6.91 MN/m2, and range of loss factor was 0.01–0.03. The most significant properties that were different between individual studs were the profile geometry, thickness of the material, and the cut openings in the studs. The method is complete and it could also be considered in standardization committees. Full paper is available in Ref. [1].