20.500.12556/RUL-126915 On the estimation of structural admittances from acoustic measurement using a dynamic substructuring approach A reconstructed displacement field using near-field acoustic holography (NAH) serves as an alternative to conventional measurement methods when it comes to obtaining the high-resolution vibration response of a structure. The method is highly applicable as it enables direct, non-contact measurement of the 3D structural response based on a single acoustic measurement. Although useful, the method's ill-posed nature limits its use in the field of structural dynamics. This problem can be effectively addressed by using regularization and/or field-separation techniques that can attenuate the noise and the presence of external acoustic sources. All these methods rely on the measurement of acoustic quantities; therefore, the reconstruction of structural admittances is based solely on the evaluation of the hologram(s). This article proposes an alternative approach to improving the accuracy of NAH-based structural admittances by integrating them with a few discrete response measurement on the structure itself. The formulation relies on the mixing of the high-resolution NAH measurement with accurate discrete measurements (e.g., accelerometer or laser vibrometer) using dynamic substructuring techniques. The proposed hybrid approach is a very powerful modeling methodology that can integrate high-resolution spatial measurements using NAH with the accuracy and consistency provided by precise translation discrete measurements. In order to mix two experimental response models System Equivalent Model Mixing (SEMM) method is proposed. An experimental case study on a T-shaped structure demonstrates the robustness and improved accuracy of the estimated structural admittances compared to the plain NAH formulation. acoustic measurement near-field acoustic holography dynamic substructuring system equivalent model mixing hybrid model akustična meritev akustična holografija v bližnjem polju dinamsko podstrukturiranje mešanje ekvivalentnih modelov hibridni model true false true Angleški jezik Slovenski jezik Članek v reviji 2021-05-10 13:17:20 2021-05-10 13:17:26 2025-03-14 10:36:44 0000-00-00 00:00:00 2021 0 0 Str. 1-10 art. 108115 Vol. 180 Sep. 2021 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 2021-02-18 2021-04-08 2021-09-01 2023-09-01 534.6(045) 0003-682X 10.1016/j.apacoust.2021.108115 62006531 RAZ_Ocepek_Domen_2021.pdf RAZ_Ocepek_Domen_2021.pdf 1 F50F0D6F3187865E77E911EF9F3104E4 e762375982abf142b9ddc7730c68634ac28a492594e793578b5fb487698ddbef 951de3ba-b185-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=143055 https://www.sciencedirect.com/science/article/pii/S0003682X21002085?via%3Dihub 1 4466aec8-b181-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=143054 Fakulteta za strojništvo 0 0 0