Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"vibration testing"”.
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Space Launch Environment and Vibration Testing
The pedigree of spacecraft dynamic load testing is through the one-axis-at-a-time; however, the launch vibration environment used to be a simultaneous six-axis, including three translational and three rotational. Literature suggests that the multi-axis environment induces different acceleration and …
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Ambient vibration testing of concrete dams
… (CVA)) have been applied to data from ambient vibration testing of two concrete dams namely; Roode Elsberg and Kouga dams.
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Design and vibration testing of a flexible seal whisker model
… that dramatically reduces vortex induced vibrations as they move through the water. Concurrently with rigid whisker experiments, this project focuses on the design and testing of a flexible model. The rubber model was cast with integrated Kevlar strings, for tensioning purposes, and …
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Forced Vibration Testing and Analysis of Pre- and Post- Retrofit Buildings
<p>ABSTRACT</p> <p>Forced Vibration Testing and Analysis of Pre- and Post- Retrofit Buildings</p> <p>Erica Dawn Jacobsen</p> <p> The primary goal of the thesis was to detect the retrofit through vibration testing of both buildings. The secondary goal focused on correctly identifying the behavior of …
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Estimation of Cable Forces at the Ashton Bridge through Ambient Vibration Testing
… of the structure. Superstructure and cable vibration data was collected on site after the final stage of cable tensioning. Finite element models of each cable were created using the software, Sofistik. Thereafter, the force in the cable models was iterated until the theoretical natural …
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Calibration of an arch dam model by the finite element method using ambient vibration testing
… were extracted from the structure using ambient vibration testing techniques. Besides the geometry and general material properties of the dam wall concrete and foundation rock, the measured frequencies and mode shapes depend on the conditions at the dam site namely water level, temperature and …
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Development of CubeSat Vibration Testing Capabilities for the Naval Postgraduate School and Cal Poly San Luis Obispo
… such as NPS-SCAT, requires environmental testing to ensure not only the success of the mission, but also the safety of other CubeSats housed in the same deployer. This thesis will address the development of CubeSat vibration testing methodology at NPS, including subsystem testing, …
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A Comparison and Evaluation of Different Dynamic Characterization Approaches for Bridges
… of the structures, while keeping testing efforts at a minimum. The three dynamic field test included Operational Modal Analysis, or ambient vibration testing, and controlled input vibration testing using an instrumented impact hammer and an electro-dynamic mass shaker. The two …
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The Effect of Load Stabilizer Selection on Load Shift Within Unit Loads
… were tested. Twenty unit loads for both vibration and impact testing were used, with 5 replications per load stabilizer. Container displacement and pallet-container displacement were measured, and the number of tares in the load stabilizer film, on the corners of the test units, after …
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Dynamic Analysis and Seismic Retrofit of the Point Sur Lighthouse
… was assessed using two main methods: forced vibration testing and finite element computer modeling. Forced vibration testing is a nondestructive testing method that can be used to directly characterize dynamic behavior of a structure, and finite element computer modeling is useful for the …
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Identification of Physical Changes to a Steel Frame
The thesis utilized physical testing and computer modeling to determine the feasibility of identifying a change to the mass or stiffness of a steel frame. Physical testing was performed using an accelerometer, linear shaker, and arbitrary function generator. Two methods of laboratory testing were …
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Dynamic Testing of an Elevated Water Tank
… components consisted of characterizing the vibration of the elevated water tank in its current environment through ambient vibration testing. </p>
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Nanosatellite Launch Data-Logger (Sync)
… survive the required absolute-worst-case launch vibration testing needed for flight certification. To help address this problem, and to better match testing conditions to real-world launch environments, this thesis introduces Sync, a compact 1/4U CubeSat payload designed to collect data on the …
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Preliminary investigation of the vibration characteristics of a slip table
… piece of equipment which might be subjected to vibration testing. The fundamental frequencies of the system and the ratio of the force acting on the weight to the input force for various weight ratios are determined analytically and experimentally. This ratio is called the transmissibility. …
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Monitoring the structural integrity of packaging materials subjected to sustained random loads
… to a variety of environmental hazards, such as vibrations, which, if excessively severe, may cause damage to or even destroy the product. The ability of packaging systems to withstand these dynamic loads is an important factor, since their function is not only to protect the product but also to …
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Dynamic Testing and Modeling of a Superelevated Skewed Highway Bridge
… is needed to define the procedures for testing each bridge. The NDE techniques involve dynamic testing, and the protocol for this testing has yet to be finalized. To evaluate the dynamic testing guidelines, a 103 ft single-span, simply supported highway bridge was dynamically tested. The …
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Methodology for innovative health monitoring of aerospace structures using dynamic response measurements and advanced signal processing techniques
… and experimentally verified by means of vibration testing. The analysis of operational dynamic responses will be employed to identify both the damage and its position.
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Design, Development, and Testing of Research Payloads on Various Suborbital Flight-Test Platforms
… by detailing the design, development, and testing techniques followed in the successful launch and recovery of payload experiments in currently active and upcoming suborbital launch vehicles. The research methodology involves collecting payload requirements, CAD design, computational …
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Determination of the Modal Parameters of a Five Story Reinforced Concrete Structure Using Ultra-Low Level Excitation and Computational Analysis
… and mode shapes) using ultra-low level forced vibration testing and analytical modeling were critically compared. The structure utilized for this experiment is the Robert E. Kennedy Library on the campus of California Polytechnic State University San Luis Obispo, a five-story reinforced …
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