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 13 of 13 for “"Air-Inflated"”.
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An air inflated structure
Thesis (M.Arch)--Massachusetts Institute of Technology, Dept. of Architecture, 1960.
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Effect of membrane weight on vibrations of air-inflated dams
… membrane structures, pressurized with either air, water, or both, which have been used in recent years as a means of temporarily impounding water. A number of procedures have been developed to investigate the static behavior of the dams, but the dynamic behavior has been largely neglected. The …
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Field Study to Evaluate Driver Fatigue Performance in Air-Inflated Truck Seats
… - one a polyurethane foam cushion and one an air-inflated cushion. Objective measurements of pressure distribution were taken throughout each test session, while subjective measurements were collected using surveys taken at one-hour intervals. Based on these results, we find that the …
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A Comparative Analysis of Air-inflated and Foam Seat Cushions for Truck Seats
A comprehensive comparison between an air-inflated seat cushion designed for truck seats and a commonly used foam cushion is provided, using a single-axis test rig designed for dynamic seat testing. Different types of tests are conducted in order to evaluate various aspects of each type of cushion; …
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A Study of the Effect of Varying Air-Inflated Seat Cushion Parameters on Seating Comfort
… The objective of this thesis is to examine air-inflated seat cushions to determine how seating comfort (determined by pressure change rate) is affected by changing various parameters of the cushion. To this end, a mathematical model was built using MatLab and SimuLINK to accurately …
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Nonlinear vibration analysis of inflatable dams
… In this study, the equation of motion for an air-inflated dam is derived, then solved using the Galerkin approximation method. The solution is performed for a one-term approximation and a two-term approximation, where both solutions use a sine function to approximate the deflected shape of the …
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Free vibrations of inflatable dams
… the linear two-dimensional free vibrations of an inflated cylindrical membrane. An air-inflated membrane is considered first. Vibration frequencies and modes are determined for various cases. The lowest mode shape is anti-symmetric. In the rest of the work, the membrane is inflated with water. In …
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The development, optimisation and testing of an unmanned parafoil launch system
… of the system in free flight. Flexible ram-air inflated parafoils display high sensitivity to atmospheric disturbances which complicates the comparison of measured flight-dynamic data to theoretical models in an open air free flight test. In order to improve the quality of results in …
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Analysis of the vibrations of inflatable dams under overflow conditions
… the equilibrium state. The dam is inextensible, air-inflated, and has two anchored points. The base width, curved perimeter, and internal air pressure are given. The overflow is incompressible, inviscid, and irrotational, and the total head is specified. In the static analysis, the self-weight of …
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Experimental investigation on the dynamics of inflatable dams
… as dams are considered here. Single-anchored air-inflated membranes are predominantly studied. Load combinations are considered without any water, with impounding water, and with water overflow. The two major experimental variables are the dam's internal pressure and the stream's flow rate or …
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Vibration Analysis of Single - Anchor Inflatable Dams
… modeled as an elastic shell. It is assumed to be air-inflated and resting on a rigid foundation. The cross-sectional perimeter, material thickness, modulus of elasticity, and Poisson's ratio are given. The analysis is performed for different values of internal pressure and external water heads. …
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The First Moving Load Simulator for Testing Bridges in Canada and its Application on a Full Scale Precast Box Girder
… of a large tandem, each comprising a dual air-inflated tires spaced at either 1.2 or 2.4 m. Each half-axle can apply up to 125 kN, representing the heaviest half-axle load of the CL-625 design truck of CHBDC. The maximum travel range and speed are 14.9 m and 6 ms, respectively. A bridge …
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Analysis of tire-pavement interaction and pavement responses using a decoupled modeling approach
… using a decoupled modeling approach. First, an air-inflated three-dimensional (3-D) finite element (FE) tire model was built and the interaction between a tire and a non-deformable pavement surface was simulated. The tire is modeled as a composite structure including rubber and reinforcement. …