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Characterization of road surface by means of laser scanner technologies
Published in Maurizio Crispino, Pavement and Asset Management, 2019
M.R. De Blasiis, A. Di Benedetto, M. Fiani, M. Garozzo
There are two main categories of measuring instruments. The first one includes the low-speed devices that, although are time consuming methods, are characterized by high precision, e.g.: Rod and Level, that measures the elevation profile of the road with high accuracy; The profilograph, that is a rolling device that measures the elevation profile through a wheel located at the midpoint; The Inclinometer, that measures the difference in height between two supports usually spaced between 250 and 300 mm (W. Sayers 1998). All these devices require traffic restriction.
Pavement Surface Characteristics
Published in Rajib B. Mallick, Tahar El-Korchi, Pavement Engineering, 2017
Profilographs: It consist of a mounted sensing wheel to provide free vertical movement at the center of the frame (as shown in Figure 19.5). A pavement profile is derived from the recorded deviation against a reference plane established from the profilograph frame.
Calibration of smartphone sensors to evaluate the ride quality of paved and unpaved roads
Published in International Journal of Pavement Engineering, 2022
Xinyi Yang, Liuqing Hu, Hafiz Usman Ahmed, Raj Bridgelall, Ying Huang
Agencies use different devices to measure the road roughness, such as the level pavement profiler, profilograph, high-speed inertial profilers, lightweight inertial profilers, and vehicles equipped with smartphones sensors (Smith and Ram 2016). An associated pavement management system (PMS) (Golabi and Way 1982, Chan et al. 2010) stores a roughness index such as the international roughness index (IRI) (Paterson 1986, Park et al. 2007, Múčka 2017, Pawar et al. 2018) and the profilograph index (PrI) (Leverett 2008, Múčka 2015). These roughness indices provide important indicators of road surface performance in terms of their ride-quality (Brown et al. 2010). However, deriving those indices requires particular equipment driving at a fixed speed and trained staff, resulting in high cost and long labour time.
An economic approach to road condition assessment using road user feedback: A new model and its application
Published in International Journal of Pavement Engineering, 2022
With advancements in technologies, agencies were more interested in understanding user satisfaction as a pavement performance measure. The ride quality index (RQI) is a measure of cumulative effects on user comfort and satisfaction with the pavement condition. There are measures by which ride quality can be expressed, such as Profilograph index (PrI), Full-car roughness index, Half-car roughness index (HRI), and the most commonly used international roughness index (IRI). The indices that have been discussed so far are related to the pavement surface condition. In 1993, AASHTO, in their ‘Guide for Design Pavement Structures,’ introduced a methodology to determine the remaining service life of a pavement based on the deflection and load measurements collected by a falling weight deflectometer (FWD). Pavement's structural capacity can be calculated through this method and is commonly expressed as a structural number or SN. In simplified words, SN is an index or value that represents pavement structural requirements to withstand the designed traffic intensity (Elbagalati et al., 2016).
Application of detonation coatings to design a new metal cutting tool
Published in Transactions of the IMF, 2018
A. A. Gallyamov, M. V. Nenashev, I. D. Ibatullin, A. Yu. Murzin
Lathe working for the above-mentioned material was carried out at another set of conditions to evaluate the quality of the final processing for different plates: rotation frequency of the spindle was 1000 min−1; cutting depth was 0.1 mm; longitudinal feed was 0.01 mm rev−1. After the processing, the surface roughness parameters were evaluated with a profilograph-profilometer (ABRIS-PM7). The results of the experiments are summarised in Table 1.