نتایج جستجو برای: road roughness
تعداد نتایج: 92646 فیلتر نتایج به سال:
In developing countries, large sums of money are spent annually to enhance and maintain road networks as allocated by authorities. The need users in most countries all over the world is have safe, economic, smooth roads despite pressure on authorities further reduce expenditure. Money allocation for infrastructure among many priorities competing government funds, thus causing pressure. objectiv...
The Indiana Department of Transportation (INDOT) is currently utilizing a profilograph and the profile index for measuring smoothness assurance for newly constructed pavements. However, there are benefits to implementing a new International Roughness Index (IRI)–based smoothness specification utilizing road profiles measured using inertial profilers. Technological advancements have improved the...
We propose a long-term parameterization scheme for two critical parameters, zero-plane displacement height (d) and aerodynamic roughness length (z0m), that we further use in the Surface Energy Balance System (SEBS). A sensitivity analysis of SEBS indicated that these two parameters largely impact the estimated sensible heat and latent heat fluxes. First, we calibrated regression relationships b...
An approximate analytical model was developed to estimate scalar ̄ux footprint in thermally strati®ed atmospheric surface layer ̄ows. The proposed model was based on a combination of Lagrangian stochastic dispersion model results and dimensional analysis. The main advantage of this model is its ability to analytically relate atmospheric stability, measurement height, and surface roughness length...
This paper describes the analysis and identification of road surfaces three dimensional distress characteristics by means of a three-line laser sensor. A laser-based vehicle-mounted imaging system simultaneously evaluates several conditions of road surface distress, such as ruts, cracks, and surface roughness. The three-dimensional feature extraction is done by a combination of two measuring te...
Taking road roughness, aerodynamics, and weather conditions, viz temperature humidity, into consideration, the force applied to wheel of a half-vehicle model traveling at constant speed has been calculated. A D-type rough horizontal according ISO 8606 evaluations was chosen for experiment surface profile which measured by means topographic camera Leica series acquire discrete data roughness. Th...
Road-surface microtexture (sub-millimeter scale) is essential for pavement skid-resistance. However, its measurement is only possible in laboratory on cores taken from trafficked roads, and is time consuming. For an efficient road monitoring, it is necessary to develop faster methods and usable on-site. Collaboration has been developed for two years between LCPC and the laboratory Signal, Image...
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