Effects of Variation in Quarter-Car Simulation Speed on International Roughness Index Algorithm

2004 ◽  
Vol 1889 (1) ◽  
pp. 144-151 ◽  
Author(s):  
Rohan Perera ◽  
Starr Kohn
Keyword(s):  
International Roughness Index ◽  
Simulation Speed ◽  
Roughness Index ◽  
Quarter Car

Relationship between International Roughness Index and Power Spectral Density of Asphalt Pavements in China

2013 ◽  
Vol 742 ◽  
pp. 104-108
Author(s):  
Shao Wen Liu ◽  
Xiao Zhang
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Response Function ◽  
Asphalt Pavements ◽  
International Roughness Index ◽  
Quarter Car Model ◽  
Pavement Roughness ◽  
Power Spectral ◽  
Roughness Index ◽  
Quarter Car

In this paper, pavement roughness is assumed as random stationary variable and used as the exciting force of theoretical analyses of the quarter car model of International Roughness Index (IRI). From the frequency response function of the quarter car, the response function of the displacement difference between sprung and unsprung mass is obtained based on random process theory. Then the relationship between IRI and power spectral density (PSD) is established from statement characteristic of the response function. Finally, the longitudinal road profiles of typical asphalt roads in China are used to validate the proposed model.

scholarly journals The Comparison of Measured and Simulated Dynamic Responses of Vehicles Indicated by Road Pavement Unevenness

2015 ◽  
Vol 11 (1) ◽  
pp. 10-20
Author(s):  
Martin Decký ◽  
Matúš Kováč ◽  
Peter Kotek
Keyword(s):  
Dynamic Systems ◽  
Design Method ◽  
Dynamic Responses ◽  
Asphalt Pavements ◽  
Heavy Vehicle ◽  
Dynamic Effects ◽  
International Roughness Index ◽  
Road Pavement ◽  
Roughness Index ◽  
Quarter Car

Abstract The article presents the comparison of measured and simulated dynamic responses of heavy vehicle which are indicated by road pavement unevenness. This unevenness was represented by speed control bumps, potholes and stochastic pavement unevenness. The objective simulations were realized through the medium Quarter- Car Simulation by means of application of simulated theory of dynamic systems. The reliability of used model was verificated with comparison of measured and simulated values of sprung mass T815 vehicle accelerations. In the article, there are presented courses of total vertical forces of Quarter-Car Simulation for the first, the second and the fourth classification degree of unevenness, which was considered through the world's respected parameter IRI (International Roughness Index). Obtained simulated dynamic effects of the vehicle on the pavement were used for modification of a relevant Slovak design method of asphalt pavements.

Using the International Roughness Index for Profilograph Trace Reduction

1996 ◽  
Vol 1536 (1) ◽  
pp. 90-93
Author(s):  
Steven L. Cumbaa
Keyword(s):  
United States ◽  
Flexible Pavements ◽  
The United States ◽  
Evaluation Procedure ◽  
Iri Model ◽  
International Roughness Index ◽  
Rigid Pavements ◽  
Roughness Index ◽  
Finished Surface ◽  
Quarter Car

Current Louisiana acceptance specifications for 100 percent payment require Profile Indexes (PIs) completed pavement surface to as low as 3.0 in./mi for flexible pavements and 6.0 in./mi for rigid pavements. These acceptance specifications are currently among the most stringent in the United States. Requiring an acceptance PI value of less than 7.0 in./mi when using the California-style profilograph and the 0.2 in. blanking band is unacceptable unless the blanking band is eliminated from the procedure. Louisiana's efforts to replace the blanking-band evaluation procedure with a procedure that inputs the profile trace into the quarter-car-based International Roughness Index (IRI) model are presented. The key step in this process is the scanning and digitization of the profilo-gram before determining the IRI based on the filtered profile trace. A much better correlation exists between the rideability of the finished surface and the profilograph IRI than that of the profilograph PI. New profilograph IRI specifications are recommended to replace the existing PI specifications.

Effects of international roughness index on vehicle emissions

2021 ◽  
Vol 15 (1) ◽  
pp. 41
Author(s):  
Ernesto Ferreira Nobre Junior ◽  
Arielle Elias Arantes ◽  
Priscilla Oliveira Azevedo
Keyword(s):  
Vehicle Emissions ◽  
International Roughness Index ◽  
Roughness Index

scholarly journals Avaliação de perfil longitudinal de pavimento de concreto de cimento Portland com perfilômetro inercial a laser

TRANSPORTES ◽  
2017 ◽  
Vol 25 (1) ◽  
pp. 82
Author(s):  
Fernando Silva Albuquerque ◽  
Rodrigo Fábio Silva de Oliveira
Keyword(s):  
International Roughness Index ◽  
Roughness Index

A avaliação do perfil longitudinal em pavimentos de Concreto de Cimento Portland é de suma importância, tanto para a o controle da qualidade de serviços executados durante períodos de obra, quanto para monitorar a evolução da irregularidade ao longo de sua vida de serviço. O Perfilômetro Inercial a Laser apresenta grande potencial de uso para este fim, pois proporciona elevada produtividade e resolução menor que 5 mm (a depender da velocidade de uso). Nesta pesquisa foram tomados como caso de estudo 09 segmentos da rodovia BR-101/SE, com níveis diferentes de qualidade de perfil. Os perfilogramas e resultados de IP (índices de perfis) e IRI (international roughness index) obtidos com o Perfilômetro Inercial a Laser e Perfilógrafo Califórnia (Equipamento de referência) foram comparados para todos os segmentos estudados. Para o pavimento em estudo, concluiu-se que os perfilogramas obtidos representaram de forma graficamente análoga os defeitos que interferem na irregularidade longitudinal. Na comparação para os índices IP e IRI resultantes dos dois equipamentos, os resultados apresentaram-se estatisticamente semelhantes. Portanto, observa-se que o equipamento Perfilômetro Inercial a Laser representa bem as características dos defeitos que influenciam na irregularidade longitudinal dos pavimentos de Concreto de Cimento Portland. Ele pode ser utilizado para medições do Perfil Longitudinal e obtenção dos índices de irregularidade para aceitação de obras e monitoramento da irregularidade longitudinal nas rodovias em operação.

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