Characterization and modeling of the acoustic field generated by a curved ultrasound transducer for non-contact structural excitation

摘要: Abstract Conventional excitation techniques typically use an impact hammer, piezoelectric actuator, or mechanical shaker for experimental modal testing. However, the of these devices may be challenging if accurate high-frequency dynamic measurements on small lightweight structural parts have to performed. To overcome problems, radiation force generated by focused ultrasonic transducers (FUTs) can used. This approach has shown potential used as a non-contact method small-sized flexible structures such MEMS devices, turbine blades, integral blade rotors (IBR), and biological structures. sound in air resulting imparted onto structure is not well understood critically crucial performing analysis system identification. In this research, technical development ultrasound pressure mapping simulation presented. Starting from calibrated fields spherically FUT, driven amplitude modulated signals, modeled estimated. The acoustic field FUT operating measured validating accuracy new numerical boundary element (BEM) model predicting direct range (i.e., 300–400 kHz). results show that excellent agreement found regarding both profile amplitude. Pressure up 1200 Pa transducer at 400 kHz. Experiments also prove capable creating focal spot size nearly 3 mm diameter. finish, FUT's quantified could quantify force-response relationship purposes.