Numerical simulation of the acoustic radiation of a Stradivari violin

The violin is the musical instrument represented by the masterpieces of Antonio Stradivari (1644-1737), and numerous studies have been conducted on the physical properties of the violin. In recent years, the development of noncontact measurement techniques and the increasing use of numerical simulation have expanded the possibilities for research on violins. However, there are limited studies that have used finite element analysis to investigate acoustic effects reflecting string tension preload. Therefore, this study constructed an FE model of Titian Stradivari from Strad 3D computed tomography scan data, and numerical simulations were performed to reflect the string tension preload. The numerical simulation results reflecting the string tension preload were compared with the actual measured data from the laser doppler velocimeter and showed good agreement. Therefore, a 3D visualization of acoustic radiation was performed for each mode of the numerical simulation results. As a result, the acoustic directivity may become stronger as the frequency increases, and the string tension preload may affect the acoustic directivity.