Increased demand for smaller electronics is driving the electronic packaging industry to develop smaller, more efficient component level packages. Surface mounted components, such as flip chips, ball grid arrays (BGAs), and chip-scale packages (CSPs), are being developed for use in high-volume production. All of these technologies use solder bumps to attach the active silicon to the substrate, and traditional nondestructive methods such as machine vision, acoustic microscopy or x-ray inspection cannot easily find solder bump defects. Therefore, a system, consisting of an Nd:YAG laser that delivers pulses of infrared energy to the surface of the chip, a laser interferometer to record surface vibrations, and a high-speed data acquisition system to record the signals, was developed. The pulsed laser generates ultrasound on the chips surface, exciting the whole chip into a vibration motion, and the interferometer measures the vibration displacement of the chips surface at several points. Changes in the quality of the device or its attachment to the board produce changes in the free vibration response. Characterization of the differences between good devices and devices with defects, both in time domain and frequency domain, is performed using signal analysis. The system has inspected flip chips and chip scale packages for missing and misaligned solder balls, but to characterize the resolution of the system for open solder joints, a study of the vibration modes excited by the laser source in a flip chip was performed on specimens with intentionally created defects. Experimental measurements of excited modes were compared with a modal analysis model created in ANSYS, and defects were detected as small changes in the mode shape on the surface of the chips. Current inspection methods have also been inadequate for inspecting multi-layer ceramic capacitors (MLCCs). Flex cracks, caused by manufacturing processes, often cause the capacitors to fail in-service. Samples that have been cracked intentionally were compared with reference samples to determine the feasibility of using this technique to monitor the condition of MLCCs on an assembly line. Currently, there is no on-line inspection method for controlling this problem, but this technique was able to differentiate between good and damaged capacitors.

Abstract Maritime transportation is important to national development because of Taiwan is in surrounding seas region. Therefore it is necessary that this research aimed to safety of the crane transportation system. This research investigated davit structure with a telescopic arm of a ship by means of the static analysis and modal analysis. To achieve the purpose, the researcher used the computer-aided design software Solidworks to set up this structure model. After that, he used finite element analysis software ANSYS to analyze the data. This research simulated in three situations. In static analysis, the researcher found the maximum displacement, the maximum von Mises stress and factors for safety of the structure in 16 dimensional sets in 53¢X of inclination at the davit with the telescopic arm being the shortest. After that, he discussed its tendency situation. In addition, he also checked the original structure in 53¢X of inclination at the davit with the telescopic arm being the longest and horizontal at the davit with the telescopic arm being the longest, respectively. In modal analysis, the researcher found natural frequencies and vibration shapes of the original structure. The structure had good vibration-proof ability and the resonance effect possibility not to be high. Generally, the researcher hoped that this study could provide helpful references for the relevant davit structure designers in the future.

No description available.

Thesis (M.S. in Astronautical Engineering)--Naval Postgraduate School, September 1990. / Thesis Advisor(s): Agrawal, Brij N. Second Reader: Titus, Harold. "September 1990." Description based on title screen as viewed on December 17, 2009. DTIC Identifier(s): Attitude Control Systems, Flexible Structures, Spacecraft, Structural Response, Resonant Frequency, Experimental Design, Model Tests, Active Control, Gifts Computer Program, Dynamic Response, Computerized Simulation, Control Theory, Modal Analysis, Laboratory Tests, Theses. Author(s) subject terms: Attitude Control, Flexible Structures. Includes bibliographical references (p. 52). Also available in print.

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Thesis (M.S.)--Rochester Institute of Technology, 1993. / Includes bibliographical references (leaves 80-87).

Dissertation (Ph. D.)--University of Akron, Dept. of Civil Engineering, 2009. / "August, 2009." Title from electronic dissertation title page (viewed 9/16/2009) Advisor, Craig C. Menzemer; Committee members, Wieslaw Binienda, Robert Liang, D. Dane Quinn, Kevin L. Kreider; Department Chair, Wieslaw Binienda; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

Thesis (M.S.)--Rochester Institute of Technology, 1993. / Typescript. Includes bibliographical references (leaves 100-102).

Made available in DSpace on 2016-05-17T16:51:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-11-24. Added 1 bitstream(s) on 2016-05-17T16:55:46Z : No. of bitstreams: 1 000864137.pdf: 1322861 bytes, checksum: d161e962603f1c90597c57338efb1e2d (MD5) / Este trabalho apresenta um modelo de linha de transmissão desenvolvido diretamente no domínio das fases a partir da representação por meio de quadripolos para linhas polifásicas. Deste modo, esse modelo de linha foi estruturado em função dos parâmetros longitudinais e transversais variáveis na frequência e por meio da matriz ABCD. Esta abordagem foi possível a partir da utilização implícita de uma matriz de transformação, variável em função da frequência utilizada nas transformações entre os domínios das fases e dos modos. A matriz de transformação é descrita explicitamente em função dos parâmetros longitudinais e transversais de uma linha trifásica. As grandezas modais da linha foram convertidas para o domínio das fases e resultando assim, em um modelo analítico desenvolvido diretamente no domínio das fases. O modelo proposto foi aplicado para simular uma linha trifásica em um plano de simetria vertical e também situações assimétricas envolvendo condições desequilibradas de carga, por exemplo: faltas fase-fase ou fase-terra e cargas desequilibradas. As simulações considerando condições assimétricas ou desequilibradas não são possíveis em muitos modelos no domínio do tempo e da frequência utilizando uma matriz real e constante. No entanto, a partir da utilização implícita de uma matriz de transformação variável na frequência, o modelo proposto tornou-se capaz de simular transitórios eletromagnéticos em condições assimétricas e desequilibradas. Um dos grandes atributos do modelo proposto consiste na inclusão e simulação de condições não-lineares de forma simplificada por meio de condições de contorno aplicadas aos sinais de entrada e saída das matrizes ABCD. Simulações no domínio do tempo e da frequência foram efetuadas durante o desenvolvimento deste trabalho, possibilitando a ampla análise das possíveis aplicações do modelo de linhas de transmissão proposto / This work presents a transmission line model developed directly in the domain of phases from representation through quadripolos for polyphase lines. Thus, the line model was structured as function of longitudinal and transverse parameters variable frequency and by means of ABCD matrix. This approach was possible from the implicit use of a transformation matrix, variable a function of frequency used in transformations between domains of the phases and modes. The transformation matrix is explicitly described as a function of the longitudinal and transverse parameters of a three-phase line. Modal line magnitudes were converted into the domain of the phases, resulting in an analytical model developed directly in the domain phase. The proposed model was applied to simulate a three-phase line without a vertical symmetry plane and also situations involving asymmetric unbalanced load conditions, for example: phase-to-phase or phase-ground and unbalanced loads. The simulations considering asymmetrical or unbalanced conditions are not possible in many models in the time domain and frequency using a real and constant matrix. However, from the implicit use of variable frequency transformation matrix, the model was able to simulate electromagnetic transients in asymmetrical manner and unbalanced. One of the major attributes of the model consists of the inclusion and non-linear simulation conditions in a simplified manner by means of boundary conditions applied to the input and output signals of ABCD matrices. The simulations in the time domain and frequency domain were made during the development of this work, enabling the comprehensive analysis of possible applications the lines proposed transmission model