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 51 for “"vibration response"”.
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Source and path recovery from vibration response monitoring
Thesis. (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
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Damage identification of unreinforced masonry structures based on vibration response
… artificially induced were also investigated. Vibration-based and model updating-based damage identification techniques were employed to detect the damage distribution in the specimens. Finally, a seismic assessment was conducted on a typical New Zealand URM building by applying time-history …
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Prediction of Floor Vibration Response Using the Finite Element Method
Several different aspects of floor vibrations were studied during this research. The focus of the research was on developing a computer modeling technique that will predict the fundamental frequency of vibration and the peak acceleration due to walking excitation as given in AISC Design Guide 11, …
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Free Vibration Response Comparison of Composite Beams with Fluid Structure Interaction
The analysis of the dynamic response of a vibrating structure in contact with a fluid medium can be interpreted as an added mass effect known as the Fluid Structure Interaction (FSI) problem. This effect is critical in the study of composites for marine applications since the densities of the …
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A study of vibration response characteristics of the human hand-arm system
Prolonged exposure to vibration transmitted to the operators of hand-held power tools has been related to symptoms of vibration white finger (VWF) disease, also known as "Raynaud's Phenomenon of Occupational Origin". Many subjective and objective epidemiological, and clinical studies have …
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Reduction of the flow induced vibration response of a marine cable by altering the cable boundary conditions
Thesis (Mech.E)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983.
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Non-stationary time-dependent ARMA random vibration modeling, analysis & SHM with wind turbine applications
… is the output-only identification of the vibration response of structures with time-dependent dynamics under uncertainty, and its application to the diagnosis of structural damage, referred to as vibration-based Structural Health Monitoring (SHM). This is of relevance to several classes of …
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Experimental characterization of the dynamic response of a mock-up CANDU fuel bundle
This thesis discusses the vibration response of a mock-up CANDU 37M fuel bundle. The experiments are performed using non-invasive methods of vibration measurement by means of high-speed cameras and laser displacement sensors. The contact dynamics between the fuel bundle and the pressure tube are …
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Dynamic analysis of rotating fan structures by the Finite Element Method
… fan and used for the prediction of its dynamic response and critical speeds. The research led to a study of the influence of riveted spider-to-blade connections on the vibration response of propeller fans; This thesis also presents a mathematical transformation analysis and an explanation of a …
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An investigation of the response of a 1/5-scale model of the Titan III launch vehicle to longitudinal excitation
… resonant frequencies and mode shapes from vibration tests with a 1/5-scale model of the Titan III-A launch vehicle are presented, Measurements of longitudinally excited vibration modes of the model structure supported in a suspension system offering negligible restraint to longitudinal …
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Efficient design of spacecraft electronics to satisfy launch vibration requirements
… equipment failing the pre-flight qualification vibration test, whilst also being quick and simple to implement. These relatively simple tools consist of: (1) a list of different component types ordered by their ability to withstand vibration, allowing a user to choose more robust packages over …
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The Effect of Sensor Mass, Sensor Location, and Delamination Location of Different Composite Structures Under Dynamic Loading
… of the use of accelerometers and dynamic response as a cost-effective and reliable method of structural health monitoring in composite structures. The composite structures in this research included carbon fiber plates, carbon fiber-foam sandwich panels, and carbon-fiber honeycomb sandwich …
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Dynamic modeling and vibration control of high-voltage overhead transmission lines
… it allows an optimal design and positioning of vibration dampers for the cables. Excessive sway and oscillation of power lines need to be avoided, as they can lead to damage of the lines and power interruptions. The relatively high flexibility of the cables, coupled with the large spans and …
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Stability behaviour and dynamic response of cooling towers subjected to wind loading
… with all diameter ratios. A linear eigenvalue vibration parametric analysis is presented for various cooling tower shell geometries to observe trends in the free vibration response (natural frequencies and mode shapes). The forced response of the cooling tower to various forcing frequencies of …
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Aeroelastic Analysis of a Flexible Membrane Wing
… research involves characterization of the forced vibration response of a wing appendage used to augment short field take off and landing (STOL) operations.</p> <p>Although flutter theory is now well understood, the LAS presents the complications of a highly deformable airfoil shape as well as …
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Development, modeling, testing and evaluation of vibration attenuating gloves
Gloves that attenuate vibration above approximately 25 Hz and that exceed the characteristics of standard viscous-elastic, neoprene based gloves have been developed using an air bladder system in the palm and fingers of a gLove Testing was performed on a variety of viscous-elastic gloves currently …
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Intelligent Transportation Systems and Virtual Reality as Technology Accelerators for Smart Infrastructure Monitoring
… This information is integrated with the bridge's vibration response and the finite element (FE) model to develop a digital twin of the bridge. The necessary models for the traffic tracking component are trained using Google Open Images and tested in a VR environment that simulates traffic on a …
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Tuning of the middle ear in túngara frogs ( Engystomops pustulosus)
… above. Using laser vibrometry, I evaluated the vibration response of the eardrum and body wall to airborne sound. The results revealed a clear mismatch between the tuning of both middle ear and lungs, and that of the brain, with the eardrums and lungs tuned to approximately 2500 Hz and the brain …
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Nonlinear vibration analysis of viscoelastic plates with fractional damping
… integrals. In the present study, the nonlinear vibration analysis of a rectangular composite plate with fractional viscoelastic properties has been analytically investigated. The plate is modeled based on the von Kármán plate theory, and the Caputo’s fractional derivative has been utilized to …
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Bragg grating sensor interrogation using in-line, dual-mode fiber demodulators
… is limited due to high costs and poor frequency response. In this thesis, recent reported demodulation schemes are compared and a novel interrogation system using dual-mode optical fiber as an intensity-based demodulator is proposed. The modal birefringence of the dual-mode fiber is wavelength …
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