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 24 for “"Truss structure"”.
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Design optimization of a space truss structure
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Spatial spectral analysis of elastic waves in a three-dimensional truss structure
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Design and modeling of a force sensitive toothbrush by using a buckling truss structure
… pleasing or ergonomic. Some prior art buckling structures also often had thin hinge sections which are difficult to injection mold and act as failure points and the resulting broken structure can be dangerous. Prior art buckling toothbrush structures further had the problem of once they buckled, …
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Implementing Impedance - Based Health Monitoring
… health monitoring technique to complex structures. The work is presented in three parts. In the first part we consider effects of the following three factors on damage detection abilities: actuator excitation level, test wire length and ambient conditions (temperature, structural loading …
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Spider web geometry inspires long span roof trusses
… implement them into a practical long span roof truss structure. Specifically, utilizing data and properties of spider webs found in research from Su et al. (Su I. a., 2016). The research uses and implements spider's web design blueprints in present day structural systems. Initially, the size of …
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Semantic and Fiducial Aided Graph Simultaneous Localization and Mapping for Robotic In-Space Assembly and Servicing of Large Truss Structures
… for robotic assembly and servicing of large truss structures. SF-GraphSLAM contributes to the state of the art by creating a novel way to add associations between map landmarks, in this scenario fiducials, by pre-generating a semantic map of expected relations based on the truss module known …
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Damage detection in structures using frequency response function (FRF) data and finite element modelling
… stiffness matrix of the original undamaged structure and the frequency response curve of the currently damaged structure. In this thesis, the former is obtained from a finite element model of the virgin structure and the latter are obtained from an impact hammer test. The Damage Detection …
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Modular robots for making and climbing 3-D trusses
A truss climbing robot has been extensively investigated because of its wide range of promising applications such as construction and inspection of truss structures. It is designed to have degrees of freedom to move in three-dimensional truss structures. Although many degrees of freedom allow the …
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Multi-Objective optimization of arch bridges
Trussed arch bridges are commonly used to attain big spans. They are efficient structures that offer a wide range of geometries, materials, and topologies. This thesis studies the influence of the geometry and topology of arch bridges on both their structural performance relayed by the maximum …
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Micropolar Continuum Modeling of Large Space Structures with Flexible Joints and Thermal Effects: Theory and Experiment
… (homogenized) model for a large antenna space structure with flexible joints. An energy equivalence concept is employed to find the continuum model for the system. The kinetic and strain energy expressions of the fundamental elements are found based on the assumptions of the micropolar …
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Electro-dynamic analysis of stack actuators and active members integrated within truss structures
… and piezoelectric) integrated within complex structures is developed and experimentally verified. This research was motivated by a need to accurately predict transmission force, velocity output, and power consumption for a wide range of applications both terrestrial and space based. The …
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Nonlinear Cyclic Truss Model for Beam-Column Joints of Non-ductile RC Frames
… components that have a significant impact on the structure's behavior. Modern detailing provides sufficient strength within these joints to transfer the forces between the beams and the columns during a seismic event, but existing structures built with poor detailing are still quite prevalent. …
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A Comparison and Evaluation of Different Dynamic Characterization Approaches for Bridges
… approaches for full scale bridge structures to devise a rapid and reliable Structural Health Monitoring (SHM) program in the aftermath of a natural or manmade hazard. Present methods for structural condition evaluation of bridge structures rely heavily on on-site visual inspections …
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Modeling and Optimization of In-Space Manufacturing to Inform Technology Development
… thermoplastic pultrusion to produce an 11.6 kg truss structure supporting a 60 kW solar array wing. The approach presented in this thesis is intended for use by space system designers seeking to incorporate ISM into their mission plans, as well as for ISM technology developers looking to …
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Thermal properties of advanced aerogel insulation
… prototype of an insulation panel combining a 3-D truss structure, monolithic or granular silica aerogel, and reduced pressure will be constructed and tested.
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Performance assessment and enhancement of precision controlled structures during conceptual design
… the optical train of a lightweight, flexible structure subjected to various disturbances. It is advantageous to assess the performance of initial concepts of these precision systems early in the design stage to aid in the requirements flowdown and resource allocation process. A complete …
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Testing and Analysis of a Fiber-Reinforced Polymer (FRP) Bridge Deck
… used to rehabilitate a historical cast iron thru-truss structure (Hawthorne St. Bridge in Covington, Virginia). This research seeks to address following technical needs and questions to advance FRP deck application. The critical panel-to-panel connections were developed and evolved through a …
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Extraction of eigen-pairs from beam structures using an exact element based on a continuum formulation and the finite element method
Studies of numerical methods to decouple structure and fluid interaction have reported the need for more precise approximations of higher structure eigenvalues and eigenvectors than are currently available from standard finite elements. The purpose of this study is to investigate hybrid finite …
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Assessing Structural Integrity using Mechatronic Impedance Transducers with Applications in Extreme Environments
… identify structural damage on various complex structures. The basic principle behind this technique is to apply high frequency structural excitations (typically higher than 30 kHz) through the surface-bonded piezoelectric transducers, and measure the impedance of structures by monitoring the …
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Experimental comparison of probabilistic methods and fuzzy sets for designing under uncertainty
… obtained using each method. A cantilevered truss structure is used as a test case. The truss is equipped with passive viscoelastic tuned dampers for vibration control. The structure is optimized by selecting locations for tuning masses added to the truss. The design requirement is that the …
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