Experimental Correlation between the Road Roughness and the Comfort Perceived In Bus Cabins

Fichera, Gabriele; Scionti, Marco; Garescì, Francesca

doi:10.4271/2007-01-0352

Cited by 24 publications

(21 citation statements)

References 2 publications

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“…Specifically, it was decided to compare the ratio between IRI thresholds at two adjacent velocities (e.g., IRI (30)/IRI (20) or IRI(80)/IRI(70)), calculated using Equation (9), and obtained by employing both the threshold values suggested by Yu et al [35] and those suggested by Cantisani and Loprencipe [19] with regard to very good ride quality level. It can be supposed, in fact, that this ride quality level characterizes new or reconstructed roads.…”

Section: Resultsmentioning

confidence: 99%

“…In this way, it would be possible to reflect the comfort perceived by road users. Many authors have analyzed existing relations between IRI and vertical accelerations measured on driver and/or passenger seats, considering different types of vehicles and different velocities [17,[20][21][22]. Most of these studies found a linear regression with R 2 values within the range from 0.76 to 0.99.…”

Section: Introductionmentioning

confidence: 99%

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

Loprencipe

Zoccali

2017

Coatings

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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

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“…For such complicated multibody systems, even with high simulation accuracy, it is difficult for transport and pavement engineers to use them to evaluate road roughness condition in a large city network. In this case, the vehicle-infrastructure dynamics interaction can be simulated sufficiently based on the equations of motion of the vehicle [20], such as a 6-DOF half bus model [21] or a 3-DOF quarter bus model (Bus Ride Index) to correlate passenger ride comfort with road surface irregularities [22].…”

Section: Introductionmentioning

confidence: 99%

An experimental comparison of mathematical heavy-duty city bus models to evaluate passenger ride comfort induced by road roughness

Nguyen

Swolana

Lechner

et al. 2021

Mathematical and Computer Modelling of Dynamical Systems

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Mathematical models have been used widely to investigate the vehicle-passenger-infrastructure dynamical interaction; however, the responses of various heavy-duty city bus models to estimate ride comfort induced by road roughness are still unknown. In this study, the comparison of dynamical response of buses used in city transport is investigated based on multi-degrees-of-freedom (DOF) bus models developed in MATLAB/Simulink and correlated against passenger ride comfort criteria. The results showed that 9-DOF full bus model is the best option to estimate passenger ride comfort within an error of 2%, as compared to 5-DOF half and 3-DOF quarter bus models with 7% and 20% errors using one wheel-track, and 24% and 36% errors using two wheel-tracks, respectively. The error was calculated as the difference between simulated results from three bus models and the measured data. These mathematical bus models can be customized for estimating passenger ride comfort and surface roughness of dedicated bus/bus-rapid-transit lanes.

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“…Field measurements are still rare and have only been available in recent years ( 4–14 ). An overview of published relationships between WBV and IRI was provided in Múčka ( 15 ).…”

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confidence: 99%

“…An overview of published relationships between WBV and IRI was provided in Múčka ( 15 ). Measurements have been taken for: a passenger car using a dummy ( 9 ), a luxury sport utility vehicle (SUV) ( 11 ), a luxury sedan ( 16 ), a multifunctioning vehicle ( 12, 13 ), a van ( 10 ), a van and ambulance ( 4 ), a bus ( 6 ), and a truck with trailer ( 4, 7 ). Vehicle speeds ranged from 30 to 120 km/h.…”

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confidence: 99%

International Roughness Index Thresholds Based on Whole-Body Vibration in Passenger Cars

Múčka

2020

Transportation Research Record

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This study analyzed whole-body vibration (WBV) on a car seat (seat surface and feet) in passenger cars as a function of longitudinal road roughness. Measurements were provided on nine different cars in six categories and included a total travel distance of 1,860 km. The root mean square (RMS) of the frequency-weighted acceleration was used to quantify WBV. The relationship between seat acceleration response and comfort reactions according to the ISO 2631-1 and the International Roughness Index (IRI) was estimated. IRI thresholds were proposed as a function of vehicle speed and road category. Proposed IRI thresholds decreased with vehicle velocity and were similar with published IRI threshold proposals based on simulation. IRI thresholds as a function of speed limit should decrease with power by approximately –0.75. Substantially lower (by ~ 40%) IRI thresholds were calculated for the total vibration value (six signals) in comparison with vertical vibration on the seat surface.

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Experimental Correlation between the Road Roughness and the Comfort Perceived In Bus Cabins

Cited by 24 publications

References 2 publications

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

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

An experimental comparison of mathematical heavy-duty city bus models to evaluate passenger ride comfort induced by road roughness

International Roughness Index Thresholds Based on Whole-Body Vibration in Passenger Cars

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