Download Spectral Element Method in Structural Dynamics by Usik Lee PDF

By Usik Lee

Spectral point strategy in Structural Dynamics is a concise and well timed advent to the spectral point process (SEM) as a method of fixing difficulties in structural dynamics, wave propagations, and different similar fields. The e-book comprises 3 key sections. within the first half, heritage wisdom is determined up for the readers by way of reviewing past paintings within the zone and by means of supplying the basics for the spectral research of indications. within the moment half, the idea of spectral aspect strategy is supplied, concentrating on tips on how to formulate spectral aspect types and the way to behavior spectral point research to acquire the dynamic responses in either frequency- and time-domains. within the final half, the purposes of SEM to varied structural dynamics difficulties are brought, together with beams, plates, pipelines, axially relocating buildings, rotor platforms, multi-layered constructions, shrewdpermanent buildings, composite laminated constructions, periodic lattice constructions, blood stream, structural barriers, joints, structural harm, and impression forces identifications, in addition to the SEM-FEM hybrid method.Presents all facets of SEM in a single quantity, either thought and applicationsHelps scholars and pros grasp linked theories, modeling procedures, and research methodsDemonstrates the place and the way to use SEM in practiceIntroduces real-world examples throughout quite a few structuresShows how types can be utilized to guage the accuracy of different answer methodsCross-checks opposed to strategies received through traditional FEM and different answer methodsComes with downloadable code examples for self reliant practiceSpectral aspect strategy in Structural Dynamics can be utilized by way of graduate scholars of aeronautical, civil, naval architectures, mechanical, structural and biomechanical engineering. Researchers in universities, technical institutes, and industries also will locate the booklet to be a priceless reference highlighting SEM functions to numerous engineering difficulties in components of structural dynamics, wave propagations, and different similar topics. The booklet is also utilized by scholars, professors, and researchers who are looking to examine extra effective and extra exact computational equipment helpful for his or her study themes from all parts of engineering, technological know-how and arithmetic, together with the parts of computational mechanics and numerical equipment.

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1 kg/s, k ¼ 36p2 N/m, f0 ¼ 20 N, and t1 ¼ 1 s. To compute the dynamic response by using the DFT processing, we conduct the following process. 33 Spectral Analysis of Signals Step 1: The unit impulse response of the dynamic system is given by hðtÞ ¼ 0:053eÀ0:05t sinð5:999ptÞ which is found to take more than 92 s to decay down by a factor of 1/100. Thus the recommended sampling time window should be larger than the values Th ¼ 92 s and Tf ¼ 1 s to make the aliasing error sufficiently small. 41, Ts should be larger than 92 s.

However, the major difference is that in general the spectral element formulation begins with transforming the governing partial differential equations of motion from the time domain into the frequency domain by using the DFT. For one-dimensional (1-D) problems, as a result of the DFT processing, the time variable disappears and the frequency becomes a parameter to transform the original timedomain partial differential equations into the frequency-domain ordinary differential equations. The frequency-domain ordinary differential equations are then solved exactly and the exact wave solutions are used to derive frequency-dependent dynamic shape functions.

6 Consider a signal given by x(t) ¼ eÀ2tÁsin6pt. , Ts ¼ 1 s) so that the number of original samples becomes N ¼ 16. 11 shows the effect of tripling the number of samples in the time domain. The FFT for the zero-padded data (white dots) contains the same information as the unpadded data (black dots), alongwith providing interpolation with two additional data between every three points. 6. The frequency spectrum for the unpadded case is zero padded to three times its original length. 12 shows the effect of zero padding in the frequency domain.

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