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 15 of 15 for “"Ground Vibration"”.
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The surface propagation of ground vibration
… model, which idealises the source of the ground vibration as a strip of pressure varying harmonically in time. The ground below the strip is modelled as homogeneous, isotropic and elastic, with hysteric internal damping characterised by a loss factor. For an infinite strip load, which …
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Ground vibration measurements with special reference to pile driving
… in recent years over the level and nature of the ground vibrations. The importance of such vibration has increased rapidly due to developments in construction in urban areas, where the effects of ground borne vibration on both humans and structures are considerable. Research has been undertaken to …
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Ground vibration from underground railways: how simplifying assumptions limit prediction accuracy
Noise and vibration from underground railways is a documented disturbance to individuals living or working near subways. Much work has been done to understand and simulate the dynamic interactions between the train, track, tunnel and soil resulting in numerical models which can predict ground-borne …
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Effect of Vibration of Unconsolidated Sand on the Performance of Interferometric Vibration Sensors
<p>Interferometric vibration sensors are widely used for ground vibration measurements where traditional contact sensors are not desired. Laser Doppler vibrometers (LDV) and digital speckle pattern interferometers are studied in this thesis. The working principle of laser Doppler vibrometry and …
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AI-POWERED DIGITAL TWIN MODELING USING LARGE HIGHWAY INFRASTRUCTURE DATASETS
… stability risk monitoring, moving train-induced ground vibration analysis, and pavement strength evaluation. By Leveraging machine learning (ML) and finite element modeling (FEM), the study develops innovative tools for geotechnical and structural condition monitoring and response analysis. Key …
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Model updating of modal parameters from experimental data and applications in aerospace
… and under realistic test conditions during the Ground Vibration Test on the European Space Agency's Polar Platform are described. Considerable improvements are achieved with respect to the phase purity of the identified mode shapes as compared to other methods or manual tuning strategies as well …
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Experimental and Computational Analysis of a 3D Printed Wing Structure
… static deformation tests as well as dynamic Ground Vibration Tests (GVT). The developed model is compared against the commercial software Nastran/Patran. Further plans include experimental aerodynamic test of 3D printed wing in the new Embry-Riddle Aeronautical University’s (ERAU) wind tunnel …
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A low cost, DC-coupled active vibration isolation system
… are two major functional requirements of vibration isolation systems. With conventional passive isolation systems, a tradeoff exists between improving force disturbance rejection maintaining ground vibration isolation. Commercial active isolators address such a tradeoff through the use of …
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Characterization of in-phase and out-of-phase vibration modes of secondary structures attached to a primary structure by experimentation and finite element analysis
Ground vibration testing (GVT), is one of the most critical testing procedures for airplane certification. With proper GVT, analysts can determine the stiffness distribution, natural frequencies, mode shapes, and structural damping of each component, all of which are needed to perform flutter and …
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Nondestructive detection of foundation pile embedment depths for high mast light towers
… designs and soil conditions; (ii) use of ground vibration waveforms captured by a seismic cone penetrometer (SCP); (iii) three-dimensional visco-elastodynamic finite element analysis (FEA) used as a tool to relate the sensory data to in situ pile length; (iv) use of machine learning (ML) …
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Stability enhancement of a transonic wing using a passive nonlinear energy sink
… wing, a series of experimental and computational ground vibration tests of the wing were performed. They showed that the NES has a profound effect on the second bending mode of the wing, even for small wingtip oscillations. This is a strong indication that the prototype NES will be effective in …
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Experimental and Computational Approaches to Enhance the Gravimetric Monitoring of Volcanic Areas
… . In Chapter 1 is described the technical background gravimetric monitoring of active volcanoes in terms of measurements techniques with spring relative and absolute gravimeters. It also discusses on the complexity of the gravity signal and on different gravity contributions that must be …
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Improving Health and Safety at Surface and Underground Mines by Implementing Emerging Technologies Coupled With Geotechnical and Climatic Modeling
… part of any mining operation - surface or underground. When deficiencies are identified, they usually lie with the factors that contribute to unsafe and unhealthy working conditions. The health and safety focus for modern underground mines involves improving the subsurface thermal climate …