Figure 5. Measurements and analysis of the response to vibrations generated by impact hammer; Figure 5. Measurements and analysis of the response to vibrations generated by impact hammer; ( a ) Visualization of the acoustic field by Soundcam, and ( b ) Sound pressure levels after 3 successive ( a ) Visualization of the acoustic field by Soundcam, and ( b ) Sound pressure levels after 3 successive impacts and frequency spectrum of the induced sound (turned vertically). impacts and frequency spectrum of the induced sound (turned vertically).