Use of generated artificial road profiles in road roughness evaluation

Loprencipe, Giuseppe; Zoccali, Pablo

doi:10.1007/s40534-017-0122-1

Cited by 58 publications

(30 citation statements)

References 16 publications

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“…Given the longitudinal profiles, the whole-body vibrations (WBV) experienced by vehicle occupants were estimated by simulating the passage of the full car model on each surveyed RPC. An 8-degrees-of-freedom (dof) vehicle model full car simulated the passage at 4 speed values [38,43]: 20 km/h, 30 km/h, 40 km/h, and 50 km/h. The 8-dof vehicle model was developed by Cantisani and Loprencipe [38], and was calibrated in order to represent the behavior of a passenger car using the ISO 2631 approach [44], calculating the vertical frequency-weighted accelerations (a wz ) as described in the same standard.…”

Section: Methodsmentioning

confidence: 99%

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Loprencipe¹,

Moretti²,

Pantuso³

et al. 2019

Applied Sciences

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In urban areas traffic-calming strategies and pedestrian friendly measures are often adopted to reduce the adverse impacts of motor vehicles on vulnerable users. This study surveyed 24 raised pedestrian crossings (RPCs) to examine their geometrical and functional characteristics. Geometric characteristics, location, administrative and effective vehicle speed, and the whole-body vibration acceleration induced to vehicle occupants while they are passing over, were considered. In addition to the analysis of the field data, geometrical and functional criteria to design RPCs were carried out. Particularly, two design approaches have been considered. In the first one, RPC provides a designated route across a carriageway raised to the same level, or close to the same level, as the sidewalks that provide access to the pedestrian crossing. In such condition, an RPC is not a traffic-calming device and its design should satisfy geometrical and comfort criteria for designing roads. The results from the surveys demonstrated that less than 10% of RPCs guarantee ride comfort. According to the second design approach, an RPC acts both as a marked pedestrian feature and as a traffic-calming device (i.e., it is trapezoidal in shape with sharp edges). The analysis of the vertical accelerations on vehicle occupants reveal that more than 90% of the surveyed RPCs comply with geometrical and dynamic criteria for speed tables. Extreme variations concerning the observed geometrical characteristics of RPCs and the modelled dynamic performances have been observed: It results in noneffective treatments. Therefore, the results of this study would contribute to providing geometric best practices for overcoming the regulation gap in this subject, and designing RPCs according to international standards. pedestrian infrastructures is increasing [15,16]. Over the years, different systems have been adopted to reduce the risk of vehicle-pedestrian collisions, especially in urban areas. Speed control undulations (SCUs) are traffic-calming units that aim to increase pedestrian safety, as well as reduce noise and pollution from traffic in residential areas.Undulations are usually installed on residential, local, or collector roads; at any rate, these urban roads should not have buses, emergency traffic or, in general, heavy traffic, and should have an administrative speed limit of 20 or 30 km/h [5,17]. A warning sign with an adequate speed limit sign should be installed before an undulation [1,18]. When 15% of traffic exceeds the speed limit by 8-16 km/h the enforcement band is not effective [19], and the road manager could evaluate the installation of SCUs and/or other traffic-calming systems.Raised pedestrian crossings (RPCs) are used in urban areas to increase the walkability of neighborhoods [20] and to reduce the probability of pedestrian injuries and fatalities after a crash, either within specific traffic-calming programs, or more generally within Sustainable Urban Mobility Plans, with increased road safety being one of the main priorities in th...

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Section: Methodsmentioning

confidence: 99%

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Loprencipe¹,

Moretti²,

Pantuso³

et al. 2019

Applied Sciences

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“…5 and the road classification provided by ISO 8608 lies between letters "A" and "H". For this simulation, the PSD profile operates at levels "C" and "D", between an average and poorly paved road profile [22].…”

Section: Fig 4: Displacement Of Vehicle Center Of Gravity or Bounce Dmentioning

confidence: 99%

Influence of Model Parameters on Vehicle Suspension Control

.¹

2018

IJRET

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Numerical models are widely used to characterize the vehicle dynamics in order to control the active suspension process. However, little information is available on the evaluation of performance when the model parameters do not match real vehicle configurations. Obtaining estimates of the influence of these factors on the system control requires statistical analysis, which generates stochastic data on the issue under consideration. A sensitivity analysis of the test data is one the most successful approaches to this type of problem. A Monte Carlo simulation with uncertainty parameters for mass, front and rear stiffness and damping was used with design of experiments analysis to evaluate the performance of three methods of active suspension control (PID, MPC and LQR). In this study a sensitivity analysis was developed to determine the relevant factors and the crosscorrelation effects of their features. The methodology is applied to a model of a passenger car, which is excited by an asymmetric speed bump and uneven road profile. The changes in the behavior of the main parameters of each controller were observed and evaluated as improved for the PID and MPC controllers and worsened for the LQR controller when compared to the designed condition.

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“…In particular, to classify road surface profiles according to the aforementioned standard, the PSD of elevations was calculated using Fast Fourier Transform (FFT) and the Hanning window. Then, the smoothing and fitting processes described in Loprencipe and Zoccali [34] were performed. As reported in Table 3, the real road profiles considered in this study belong only to the following classes: A (very good), B (good), C (average) and D (poor); with a significant predominance of the second one (class B profiles).…”

Section: Data Set Of Road Profilesmentioning

confidence: 99%

Ride Quality Due to Road Surface Irregularities: Comparison of Different Methods Applied on a Set of Real Road Profiles

Loprencipe

Zoccali

2017

Coatings

Self Cite

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Road roughness evaluation can be carried out using different approaches. Among these, the assessment of ride quality level perceived by road users is one of the most-used. In this sense, different evaluation methods have been developed in order to link the level of irregularities present on road surface profiles with the induced detrimental effects in terms of discomfort. In particular, relationships between wavelength content of road profiles and consequent level of comfort perceived had been investigated by using, in general, a mean panel ratings approach. In this paper, four ride quality evaluation methods (Ride Number, Michigan Ride Quality Index (RQI), Minnesota Ride Quality Index and frequency-weighted vertical acceleration, a wz , according to ISO 2631 were applied to a set of real road profiles. The obtained results were analyzed, investigating a possible relation between the different indices, comparing them also with the most-used road roughness method worldwide: the International Roughness Index (IRI). The analyses carried out in this work have highlighted how the various rating scales may lead to a different ride quality assessment of the same road pavements. Furthermore, comparing the a wz with the values obtained for the other three methods, it was found that their rating scales are set for speeds within the range 80-100 km/h. For this reason, it is necessary to identify new thresholds to be applied for lower speeds, as in the case of urban roads. In this sense, the use of the ISO 2631 approach would seem to be a useful tool.

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Use of generated artificial road profiles in road roughness evaluation

Cited by 58 publications

References 16 publications

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Raised Pedestrian Crossings: Analysis of Their Characteristics on a Road Network and Geometric Sizing Proposal

Influence of Model Parameters on Vehicle Suspension Control

Ride Quality Due to Road Surface Irregularities: Comparison of Different Methods Applied on a Set of Real Road Profiles

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