Sound radiation efficiency of lightweight building constructions—Study on the influence of panel fastening by numerical calculations and laser scanning vibrometry measurements

The aim of the presented work is to develop a calculation model for predicting vibration characteristics and consequent measures of the sound radiation efficiency of lightweight building structures including the influences of their connection means. An application of the currently normative covered processes for these structures is excluded in the relevant body of standards. Through the analysis of the velocity distribution on the surface by laser vibrometry and the simultaneously measurement of the introduced vibration energy, transfer functions could be identified. Within the scope of this work, different influencing parameters for the formation of the connecting joint between wall components are identified and their effects on the vibration characteristics are quantified. The measurement results offered not only the identification of parameters but can also be used in the development and validation of the simulation model based on the finite element method. A good correspondence between measurements and results of the introduced numerical model could be achieved. The presented simulation model offers the possibility of the consideration of the identified parameters in the formation of the connecting bodies such as the dimension of the screws, the distance between screws, the tightening torque, and the position of the screws on supporting structures.