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 35 for “"wheel loads"”.
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The measurement of automotive wheel loads at the bearing cup
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Dynamic analysis of a modern urban bus for assessment of ride quality and dynamic wheel loads
… cause poor ride quality and excessive pavement loads. Such performance is partly due to the present status of urban roads and their rapid deterioration. On the other hand, variations in the dynamic tire forces of such vehicles are known to be a cause for acceleration of road damage and are …
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A theoretical analysis of the stress distribution, due to wheel loads in the subgrade under pavements of flexible type
Thesis: B.S., Massachusetts Institute of Technology, Department of Civil Engineering, 1935
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Condition monitoring of train wheels using a cost-effective smart rail pad
… focuses on the condition monitoring of train wheels utilizing an 3D printed rail pad that is embedded with widely available accelerometers and a strain gauge. This smart rail pad was used on a heavy haul railway line to monitor train wheels by identifying any wheel defects and measuring the …
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Permanent Deformation Behavior of Airport Flexible Pavement Base and Subbase Courses
… maximum ruts occurred at the NAPTF under both 6-wheel and 4-wheel gear loadings applied following a wander pattern. Realistic pavement stresses induced by moving wheel loads were examined in the unbound aggregate base and subbase layers and the important effects of rotation of principal stress …
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Statistical Characterization of Vehicle and Track Interaction Using Rail Vehicle Response and Track Geometry Measurements
… had a significant effect on the vertical wheel loads, the track crosslevel, and the track gauge. For an increase in the degree of curvature, the variation of the crosslevel increased. The dynamic response of the vertical and lateral wheel loads showed a significant dependence on the …
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Development and analysis of a vertical dynamic railcar model
… At high speeds, dynamic effects can cause high wheel loads and harsh ride for sensitive cargos. Computer simulation of these and other vertical dynamic effects cans assist in design selections of vehicle components and diagnosis of troublesome vehicle responses. Many dynamic models available …
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Optimal suspension damping and axle vibration absorber for reduction of dynamic tire loads
… resonant modes. An analogy between the dynamic wheel loads and the ride quality performance characteristics of heavy vehicles is established through analysis of a linear quarter-vehicle model to illustrate the potential benefits of optimal damping. A weighted optimization function comprising the …
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Three-dimensional finite element modeling as a tool for flexible pavement design and analysis
… of the complexity of the landing gears and heavy loads imposed by heavier and bigger aircraft, like the Boeing 747-400, Airbus A380 and Boeing 777.</p> <p>The development of the finite element model required a finite element mesh design study and two verification studies conducted to show that the …
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Generic dynamic modelling and model-based trajectory tracking control of wheeled mobile robots (WMRs)
… control schemes for trajectory tracking of Wheeled Mobile Robots (WMRs) for industrial applications. The research extends the theoretical and experimental work at the Centre for Industrial Control, Department of Mechanical Engineering, Concordia University on mobile robotics since 1982. The …
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Behavior of bolted connections in railroad diamond crossings
… join or cross. The repeated impact and dynamic loads that diamond crossings are subjected to result in alignment problems and more rapid deterioration of the special track work elements compared to open track. This research project aims to perform finite element analysis of a diamond crossing …
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Analyses and modeling of track transition site responses from instrumented bridge approaches
… the bridge"" are often associated with dynamic wheel loads and impact forces that are caused by stiffness variation and inevitable differential settlement accumulation between a railroad bridge and track. Although many studies have investigated this bridge approach problem, a permanent effective …
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Finite Element Analysis of Insulated Railroad Joints
… in the field has decreased due to increasing wheel loads. The goal of this research is to investigate possible changes in insulated rail joint design in order to improve the performance of the insulated joint. The finite element program ABAQUS is used to model the supported butt joint. In this …
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The Effects of Resistance Wheel Running on Skeletal Muscle Function and Adaptation in C57BL/10SnJ Mice
Background: Resistance wheel running (RWR) can promote resistance-like training adaptations in mouse skeletal muscle (SkM), but its endurance-training effects are lesser known. Methods: Voluntary RWR was modulated as an exercise model to increase mouse hind-limb plantar-flexor torque and to promote …
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Characterization of the loading environment for shared-use railway superstructure in North America
A sustained increase in heavy axle loads and cumulative freight tonnages, coupled with increased development of high speed passenger rail, is placing an increasing demand on railway infrastructure. Some of the most critical areas of the infrastructure in need of further research are track …
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Influence of road roughness and directional maneuvers on the dynamic performance of heavy vehicles
… to derive correlation between the right and left wheel excitations. A range of performance measures are formulated to study the influence of road roughness on the directional dynamics and the influence of steering maneuver on the pavement damage. The equations of motion of the vehicle are solved …
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Experimental Mechanics of Crack Width in Full-Scale Sections of Continuously Reinforced Concrete Pavements
… efficiency. The capacity to transfer vertical loads across a crack depends on a series of factors of which crack width is the most important, and the focus of this research. Five pavement sections were built and loaded under accelerated traffic conditions at the ATREL full-scale testing …
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The First Moving Load Simulator for Testing Bridges in Canada and its Application on a Full Scale Precast Box Girder
… under realistic highway scale 'rolling wheel loads', determined through code procedures as well as through finite element analysis of a real bridge. The MLS has two half-axles of a large tandem, each comprising a dual air-inflated tires spaced at either 1.2 or 2.4 m. Each half-axle can …
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Transverse and Longitudinal Bending of Segmental Concrete Box Girder Bridges
… owners are finding that ratings for standard loads and permit trucks are often controlled by the transverse behavior of the girders near concentrated wheel loads. The popular analysis methods used today range from two dimensional frame models to three dimensional finite element models of the …
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Methodology to Validate Traffic Speed Deflection Devices (TSDDs) Measurements Using Laser Doppler Vibrometers (LDV) Sensors
… pavement deflection velocity under moving wheel loads. By applying the same measurement principles as TSDs, this setup provided a way to assess pavement structural response without requiring embedded sensors. Results showed consistent LDV measurements, which supported the use of LDVs for …
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