منابع مشابه
Piezoacoustic wave spectra using improved surface impedance matrix: application to high impedance-contrast layered plates.
Starting from the general modal solutions for a homogeneous layer of arbitrary material and crystalline symmetry, a matrix formalism is developed to establish the semianalytical expressions of the surface impedance matrices (SIM) for a single piezoelectric layer. By applying the electrical boundary conditions, the layer impedance matrix is reduced to a unified elastic form whether the material ...
متن کاملElectro-Mechanical Impedance Method for Crack Detection in Thin Plates
In recent years, the damage detection with E/M impedance method has gained increased attention. The method uses small-size piezoelectric active sensors intimately bonded to an existing structure, or embedded into a new composite construction. Experimental demonstrations have shown that the real part of the highfrequency impedance spectrum is directly affected by the presence of damage or defect...
متن کاملbuckling of viscoelastic composite plates using the finite strip method
در سال های اخیر، تقاضای استفاده از تئوری خطی ویسکوالاستیسیته بیشتر شده است. با افزایش استفاده از کامپوزیت های پیشرفته در صنایع هوایی و همچنین استفاده روزافزون از مواد پلیمری، اهمیت روش های دقیق طراحی و تحلیل چنین ساختارهایی بیشتر شده است. این مواد جدید از خودشان رفتارهای مکانیکی ارائه می دهند که با تئوری های الاستیسیته و ویسکوزیته، نمی توان آن ها را توصیف کرد. این مواد، خواص ویسکوالاستیک دارند....
Modal Filters For In-Duct Sound Based on the Cremer Impedance and Micro-Perforated Plates
The design of a new filter-type is presented that allows a sufficient reduction of in-duct aero-acoustic noise. The filter is a hybrid design containing a lined duct section based on the so called Cremer impedance and a section with combinations of micro-perforated plates. The Cremer impedance section strongly damps the zero-order or plane wave mode while the MPP section which breaks the circum...
متن کاملDamage Detection in Thin Plates and Aerospace Structures with the Electro-Mechanical Impedance Method
The use of the electro-mechanical (E/M) impedance method for health monitoring of thin plates and aerospace structures is described. As a nondestructive evaluation technology, the E/M impedance method allows us to identify the local dynamics of the structure directly through the E/M impedance signatures of piezoelectric wafer active sensors (PWAS) permanently mounted to the structure. An analyt...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1962
ISSN: 0001-4966
DOI: 10.1121/1.1937303