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 “"support conditions"”.
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Load-support conditions and computerized test apparatus for wood pallets
… of simulating the actions of a uniform load. In support of research directed at developing design procedures for pallets, a uniform load test machine was developed. This device loads through an air bag and records load-deflection measurements automatically in a micro computer. Test results using …
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Analysis of the performance and failure of railroad concrete crossties with various track support conditions
… of the track. Currently, the behavior of poorly supported or degraded concrete crossties and their fastening system components is not fully understood, but it is widely accepted that these conditions may have a significant influence on the demands placed on concrete crossties. To quantitatively …
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Measurement of Wood Pallet Performance Subjected to Uniform Loading in Racked, Fork Tine, and Floor Stacked Support Conditions
… pallets are exposed to a variety of loads and support conditions. This research investigates the effect of different pallet designs and support conditions on pallet stiffness. Uniform loads were applied to pallet designs containing thick or thin components and three, four, or five non-notched …
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Investigation into load bridging effect for block class pallets as a function of package size and pallet stiffness
… box size, and base design across multiple support conditions using block class wooden pallets. Headspace and base design had no effect on pallet deflection for the experimental weights used throughout testing. The effect of box size was significant on pallet deflection across multiple …
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Buckling and postbuckling analysis of delaminated beams under compressive loads
… enforce the kinematic constraints and boundary conditions, enabling a variety of support conditions to be studied.
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Investigation of the Effect of Corrugated Boxes on the Distribution of Compression Stresses on the Top Surface of Wooden Pallets
… of pallet stiffness across multiple pallet support conditions. Data analysis identified that box size had a significant effect on the deflection of the pallet. This effect was only significant for warehouse racking across the width and length support conditions. As much as a 53% reduction in …
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Investigation and Analysis of the Effect of Industrial Drums and Plastic Pails on Wooden Pallets throughout the Supply Chain
… investigation was conducted using four different support conditions commonly found in warehouses: racking across the width and length, single stacking, and double stacking. The results of the investigation indicated that for most support conditions, loading the pallet with plastic pails or drums …
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Three-Dimensional Finite Element Analysis of Stiffened Tee-Hangers.
… connection geometry combines with the support conditions to produce a highly nonlinear and statically indeterminate stress analysis problem. The applied loads are transmitted through the welds, bolts or rivets resulting in regions of high localized stresses. Because of these practical …
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Experimental analysis of the bending of circular plates using reflected light
… in analyzing plates which because of their shape support conditions, or method of loading are not easily analyzed using purely analytical methods.
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Effect of boundary conditions on the damping characteristics of a randomly excited cast nickel-aluminum bronze specimen at low stress levels.
This research examines how various specimen support arrangements affect a material's damping characteristics. The 74 lb. sample studied is cast nickel-aluminum bronze and measures 19.8 x 13.65 x 1 inches. Using previously documented Naval Postgraduate School research, desired random vibration …
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The Rate of Decay of Concentration Functions on Locally Compact Groups
… a locally compact group, there are a variety of support conditions which cause the concentration functions to go to zero. This work discusses the rate of this decay under many such conditions. This work focuses primarily on concentration functions for discrete groups, though some results are also …
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Field investigation of subgrade non-uniformity effects on concrete pavement
… heterogeneous behavior as non-uniform subgrade support, theoretically analyze its effect on slab responses, or its effect on concrete pavement performance. This research has collected geotechnical data from two roadway sections in Michigan, MI I-94 and MI I-96, to characterize the effects of the …
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Evaluation of Unit Load Stability Under Dynamic Forklift Handling Conditions
… different transportation modes and storage conditions, many of which are well researched. While industrial forklifts are paramount to material handling systems, the physical effect they have on load systems is not well understood. The weight of the unit load causes the pallets to deflect, …
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Multistable Shell Structures
… their shape to changing loading or environmental conditions and can further improve multi-purpose ultra-lightweight designs. Whilst multiple methods to create bistable shells have been proposed, most studies focussed on free-standing ones. Considering the strong influence of support conditions on …
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Fine-tuning a domain-specific language model for truss structural analysis
… geometric augmentation, load randomization, and support variations. Llama 3.2 Vision Instruct was fine-tuned using the parameter-efficient fine-tuning to produce truss description from images, and T5-large was fine-tuned to convert these text description into JSON format for analysis using the …
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Track model for predicting dynamic responses of railroad bridge approaches
… hanging ties, impact loads and various lack of support conditions, select mitigation methods for existing deficiencies, and as a result, formulate improved bridge approach designs. The first task in this PhD study involved identification of problematic track bridge approach locations that …
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Resposta dinâmica e estabilidade de tubos com escoamento interno
… of motion exists when the pipes have fixed supports. Expressions for the hamiltonian, the lagrangian and the Hamilton's principle are then derived. A generalized Rayleigh quotient is used to study the influence of flow velocity on the eigenvalues behaviour, and theoretical estimates for the …
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Under ballast mats for railway infrastructure–a North American approach to component characterization
… Loading magnitudes, loading procedures, support conditions and testing setups were varied during multiple experiments. Additionally, an assessment of the capability of UBMs to increase the allowed track structure deflection under loading (i.e. reduce track stiffness) was also conducted. …
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Patterns of Optimal Structural Layouts
… of beam layouts for a variety of boundary and support conditions are compared for optimality, including square domains with both clamped and simple corner supports, and other regular polygonal domains (triangular, hexagonal) with clamped point supports. A method for constructing optimal beam …
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Dynamic response of highway bridges under a moving truck and development of a rational serviceability requirement
… of bridge dynamic parameters and vehicle moving conditions are investigated, which includes bridge frequency, damping ratio, span length, girders distance, bracing, support conditions, truck speed, load sequence, axle's weight, and number of spans. Bridge and vehicle k-parameters, which represent …
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