The vibrations induced by surface irregularities in road pavements – a Matlab® approach

Agostinacchio, Michele; Ciampa, Donato; Olita, Saverio

doi:10.1007/s12544-013-0127-8

Cited by 205 publications

(95 citation statements)

References 10 publications

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“…Many studies are based on the use of these artificial road profiles in order to evaluate, for example, the dynamic load on road pavements due to roughness [3,4] or to calculate the transfer function needed to estimate road roughness using vehicle acceleration measurements [5]. Moreover, many studies on the design and analysis of vehicle suspensions are often based on the use of artificial profiles [6,7].…”

Section: Introductionmentioning

confidence: 99%

Use of generated artificial road profiles in road roughness evaluation

Loprencipe

Zoccali

2017

J. Mod. Transport.

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In the evaluation of road roughness and its effects on vehicles response in terms of ride quality, loads induced on pavement, drivers' comfort, etc., it is very common to generate road profiles based on the equation provided by ISO 8608 standard, according to which it is possible to group road surface profiles into eight different classes. However, real profiles are significantly different from the artificial ones because of the non-stationary feature of the first ones and the not full capability of the ISO 8608 equation to correctly describe the frequency content of real road profiles. In this paper, the international roughness index, the frequency-weighted vertical acceleration a wz according to ISO 2631, and the dynamic load index are applied both on artificial and real profiles, highlighting the different results obtained. The analysis carried out in this work has highlighted some limitation of the ISO 8608 approach in the description of performance and conditions of real pavement profiles. Furthermore, the different sensitivity of the various indices to the fitted power spectral density parameters is shown, which should be taken into account when performing analysis using artificial profiles.

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Section: Introductionmentioning

confidence: 99%

Use of generated artificial road profiles in road roughness evaluation

Loprencipe

Zoccali

2017

J. Mod. Transport.

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“…Another input parameter for the road profile formulation is the road roughness factor, varying from 1 to 8 with 1 being a high quality (smooth) road surface like an asphalt layer. On the other hand, a road roughness factor of 8 represents a very poor road quality, as in roadway layers consisting of cobblestones or similar material (Tyan et al (2009);Agostinacchio et al (2014)). …”

Section: Active Suspension Controlmentioning

confidence: 99%

Proportional-Integral State-Feedback Controller Optimization for a Full-Car Active Suspension Setup using a Genetic Algorithm

et al. 2018

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The use of active car suspensions to maximize driver comfort has been of growing interest in the last decades. Various active car suspension control technologies have been developed. In this work, an optimal control for a full-car electromechanical active suspension is presented. Therefore, a scaled-down lab setup model of this full-car active suspension is established, capable of emulating a car driving over a road surface with a much simpler approach in comparison with a classical full-car setup. A kinematic analysis is performed to assure system behaviour which matches typical full-car dynamics. A state-space model is deducted, in order to accurately simulate the behaviour of a car driving over an actual road profile, in agreement with the ISO 8608 norm. The active suspension control makes use of a Multiple-Input-MultipleOutput (MIMO) state-feedback controller with proportional and integral actions. The optimal controller tuning parameters are determined using a Genetic Algorithm, with respect to actuator constraints and without the need of any further manual fine-tuning.

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“…Increasing knowledge on terrain irregularity characteristics could improve the design of solutions for greater operator comfort. At the moment, while the ISO 8608:1995 standard [53] sets out the method to report the vertical accelerations arising from surface profiles, pointing to connections between profile roughness and mechanical failure as well as operator discomfort [53][54][55], it does not lay down any straightforward surface profile measurement methods or instruments, confirming the difficulties in making such measurements properly [56,57]. As a matter of fact, the methods to perform surface profile measurements can be direct or indirect:…”

Section: Effect Of Soil Profile On Tractor Dynamics: Theoretical Consmentioning

confidence: 99%

Whole-Body Vibration in Farming: Background Document for Creating a Simplified Procedure to Determine Agricultural Tractor Vibration Comfort

Cutini¹,

Brambilla²,

Bisaglia³

2017

Agriculture

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Operator exposure to high levels of whole-body vibration (WBV) presents risks to health and safety and it is reported to worsen or even cause back injuries. Work activities resulting in operator exposure to whole-body vibration have a common onset in off-road work such as farming. Despite the wide variability of agricultural surface profiles, studies have shown that with changing soil profile and tractor speed, the accelerations resulting from ground input present similar spectral trends. While on the one hand such studies confirmed that tractor WBV emission levels are very dependent upon the nature of the operation performed, on the other, irrespective of the wide range of conditions characterizing agricultural operations, they led researchers to set up a possible and realistic simplification and standardization of tractor driver comfort testing activities. The studies presented herewith indicate the usefulness, and the possibility, of developing simplified procedures to determine agricultural tractor vibration comfort. The results obtained could be used effectively to compare tractors of the same category or a given tractor when equipped with different seats, suspension, tyres, etc.

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The vibrations induced by surface irregularities in road pavements – a Matlab® approach

Cited by 205 publications

References 10 publications

Use of generated artificial road profiles in road roughness evaluation

Use of generated artificial road profiles in road roughness evaluation

Proportional-Integral State-Feedback Controller Optimization for a Full-Car Active Suspension Setup using a Genetic Algorithm

Whole-Body Vibration in Farming: Background Document for Creating a Simplified Procedure to Determine Agricultural Tractor Vibration Comfort

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