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Showing 1 to 20 of 117 for “"cushion"”.
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Cushion comfort constraint : choreographing infrastructures of mobility
Surface in the city is scarce. As a typical day in the city progresses, the inhabitants' surface demands transform. A children's playground goes unused at night, the valuable surface should be re-adapted for an alternative use, say a parking space for the neighborhoods drivers. This project seeks …
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Numerical Modeling of Air Cushion Vehicle Flexible Seals
Air cushion vehicle flexible seals operate in a complex and chaotic environment dominated by fluid-structure interaction. An efficient means to explore interdependencies between various governing parameters that affect performance is through high fidelity numerical simulation. As previous numerical …
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The design and performance of a low-cost inflatable wheelchair seat cushion
For wheelchair users, the use of wheelchair seat cushions is vital to preventing life-threatening pressure sores, but high quality air cushions are often too expensive and inaccessible for many people. Given the prevalence of pressure sores, there is a need for a more accessible alternative to …
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Numerical Simulation of Surface Effect Ship Air Cushion and Free Surface Interaction
… with rigid approximations and the air cushion fans are modeled using constant momentum sources. Drag data, cushion pressure data, and free surface elevation contours are presented for the calm seas cases while drag, pressure, heave, and roll data are presented for the head seas cases. …
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A Study of the Effect of Varying Air-Inflated Seat Cushion Parameters on Seating Comfort
For many years seat cushions have been investigated for their ability to reduce seating discomfort. 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. …
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Innovative decision-making methods for the preliminary design and operations of air-cushion and other marine vehicles
… techniques. This research focuses on Air Cushion Vehicles since they are the newest type of advanced marine vehicles and their study is considered both tedious and challenging. However, the research also expands to other types of marine vehicles. Both design and operational aspects are …
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MathCAD model for the estimation of cost and main characteristics of air-cushion vehicles in the preliminary design stage
… architecture terminology, the term ACV (Air Cushion Vehicle) refers to this category of vehicles, in which a significant portion of the weight (or all the weight) is supported by forces arising from air pressures developed around the craft, as a result of which they hover in close proximity …
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Enhanced comfort of seating systems through variable shape and compliance
A new type of seat cushion has been developed. The present use of the cushion is in wheelchair seating, but it may ultimately have application to general seating, particularly in situations where comfort is a significant consideration. The cushion is intended to optimally distribute the interface …
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A Comparative Analysis of Air-inflated and Foam Seat Cushions for Truck Seats
… 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; in …
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Field Study to Evaluate Driver Fatigue Performance in Air-Inflated Truck Seats
… Each driver completed a test session on two seat cushions - 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 …
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Numerical Simulation of Surface Effect Ship Characteristics and Dynamics
… effect ship which is a specific type of air cushion vehicle. The simulation work presented here attempts to replicate the model tests involving a generic surface effect ship and demonstrate the value of numerical simulations in understanding air cushion vehicles. The model tests consist of a …
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A method of characterisation of the nonlinear vibration transmissibility of cushioning materials
… of stresses. The response behaviour of cushioning or protective packaging materials under vibration excitation is central to the effective design of product packaging. The response characteristics of the cushioning material guide the design parameters of the product-transport cushion …
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The design and performance of non-linear vibration isolating materials.
… on the performance of systems employing cushion foams has not previously been reported on.In this work the influence of non-linear material behaviour on the vibration isolation characteristics of the material is examined. Previous theoretical and experimental studies have been confined to …
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Evaluation of Tissue Health and Interventions for the Prevention of Pressure Ulcers in Persons with Spinal Cord Injury
… cross-sectional area (CSA).Weight redistributing cushions are prescribed to address the increased risk of developing PUs around the bony prominences. The Tissue Health Evaluation Toolbox (THEToolbox) was used to determine the impact on tissue health of independent pressure relief (IPR) on a …
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Implementation of finite element analysis into the athletic shoe design process
… shoe the most critical component, the heel cushion, is affected only slightly. Since a person's heel is in the shape of a ball, the variation of external forces caused by human factors is not significant. Thus, finite element analysis can be used to design and test the cushion of athletic …
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The Chemokine Receptor CXCR7 Functions in Endocardial-Derived Cells to Regulate Cardiac Valve Remodeling
… body. Cardiac neural crest cells and endocardial cushions contribute significantly to these remodeling processes. Cardiac valves are fibrous tissues that separate atria from ventricles and ventricles from great vessels, and allow unidirectional blood flow through the heart. They are derived from …
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