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 49 for “"Structural Vibration"”.
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Adaptive feedforward control of broadband structural vibration
Active control of noise and vibration has been previously demonstrated in finite and infinite systems undergoing single and multiple-frequency excitations. Control of broadband noise and vibration has also been reported, but it tends to be limited to infinite and semi-infinite systems. Here, four …
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Experimentally-Based Analytical Prediction of Structural Vibration
This study evaluates the vibration isolation effect of various mounting systems in a heavy freight locomotive cab, and provides an analytical method for the prediction of structural vibration. The cab is set up in a controlled laboratory environment in a manner similar to the installation on a …
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Remote optical excitation and sensing of structural vibration
… techniques for optical excitation of mechanical vibrations in structures and with the use of non-contact fibre optic interferometers for the measurement of parameters which characterise these mechanical vibrations. Taken together, the excitation and sensing systems provide a method for fully …
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Optimal variable stiffness feedback control for structural vibration suppression
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Structural vibration damping using lightweight, low-wave-speed media
… low-density granular media and foams for use as structural damping treatments and develop analytical and numerical techniques for prediction of the damping attained in structures that incorporate LWSM. Structural damping by incorporation of LWSM is attractive for hollow thin-walled structures. We …
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Attitude control via structural vibration : an application of compliant robotics
… dynamical effects, such as the normal modes of structural vibration for structures with finite stiffness. This is the central novel result of this thesis and has implications for the design of space structures where the attitude control hardware is integrated directly into the preexisting …
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Study on Bandgap Manipulation and Structural Vibration Control in Sandwich Metastructures
… exposed to problematic medium- and low-frequency vibrations induced by operational loads, environmental disturbances, and earthquakes. Although conventional vibration isolation and mitigation methods have been widely used, they still face limitations in broadband control of medium- and …
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Broadband control of structural vibration using simultaneous sensing and actuation with nonlinear piezoelectric currents
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Multi-Degree of Freedom Passive and Active Vibration Absorbers for the Control of Structural Vibration
… of freedom (MDOF) passive and active vibration absorbers for the control of structural vibration as an improvement to conventional single degree of freedom (SDOF) vibration absorbers. An analytical model is first used to compare passive two degree of freedom (2DOF) absorbers to SDOF …
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A Study of Neural and Conventional Control Paradigms in Active Digital Control
… to investigate/compare some practical issues in structural vibration control associated with conventional and neural approaches. For this purpose two fundamental structural control problems are chosen for investigation. The first problem is a base isolation system which is an example of rigid …
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Modal analysis of laser vibrated structures
… of metallic structures to excite mechanical vibrations within those structures. As found by other authors, single high-power laser pulses ablate the irradiated surface material and may impulsively excite structural vibration; however, the use of laser power densities above the ablation …
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Fiber optic modal domain sensing of structural vibrations
… fiber optic sensors to the detection of structural vibration. Several laboratory vibration systems which demonstrate a range of component frequencies and dynamic range are analyzed in an effort to characterize the sensor's behavior. We compare frequency spectra of the sensor output with …
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Structure Borne Noise Analysis Using Helmholtz Equation Least Squares Based Forced Vibro Acoustic Components
… sound is generated or transmitted through structural vibration; however, only a small portion of the vibration can effectively produce sound and radiate it to the far-field. Therefore, cost-effective noise reduction is reliant on identifying and suppressing the critical vibration components …
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A Physically Informed Data-Driven Approach to Analyze Human Induced Vibration in Civil Structures
… how occupants are interacting with buildings via structural vibration measurements. These vibration-based occupant inference algorithms (VBOI) have been developed to localize footsteps within a building, to classify occupants, and to monitor occupant health. This dissertation will present a …
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Thermally tunable band gaps in architected metamaterial structures
… behavior, however applications that require structural vibration mitigation such as spacecraft and automotive components have variable vibration mitigation requirements over a range of operation and external conditions. In this work, we propose a method to thermally tune the band gaps of …
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Energy harvesting from wind-induced vibration of suspension bridges
… has been focused on energy harvesting from structural vibration sources for wireless self-powered microsystem applications. One method of energy harvesting is using electromagnetic mechanism to transfer mechanical energy into electrical energy. This has been studied in depth at the …
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Damping of Vibration Using Periodically Voided Viscoelastic Metamaterials
… the damping effects of a metamaterial, on structural vibration, by inducing periodic voids in the base damping material as opposed to infusing the damping material with other material. Metamaterials have been used previously to improve the damping of vibrational waves and acoustic waves …
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Modeling of the cylinder boring process for prediction of cutting force, temperature and surface error
… coupling between the cutting process and the structural vibration of the machining system due to cutting forces, a procedure for computation of process dynamics, using finite element analysis, is developed which invokes this coupling. The predicted cutting forces are used along with an …
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Passive motion control of super tall buildings : tuned mass and viscous dampers in Taipei 101.
… wind and seismic excitations. One way to reduce structural vibration under dynamic excitations is by placing damping devices in the buildings. In this thesis, the design concept, design procedure and some current applications of tuned mass and viscous dampers are discussed. Taipei101 was used as …
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