Definition of the Layout for a New Facility to Test the Static and Dynamic Stability of Agricultural Vehicles Operating on Sloping Grounds

Bietresato, Marco; Mazzetto, Fabrizio

doi:10.3390/app9194135

Cited by 14 publications

(8 citation statements)

References 61 publications

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“…is very similar to that experimented by a vehicle on a harsh surface or in an exit manoeuvre from an inter-row of a terraced slope [26] (Fig. 9): the elasticity of the tires and the possible presence of an unlocked pivot joint connecting the front axle to the chassis could or could not warrant the involvement of all the four supports (wheels) on the vehicle stability (Fig.…”

Section: Technical Features Of the Test Installationsupporting

confidence: 66%

“…Hence, starting from these prototypes, a novel installation, completely different from existing ones, unique in its design-concept and features [26], [27], was proposed to be installed in the 'Laboratory for Agroforestry Innovations' [28] of the Free University of Bolzano (Unibz), in Italy. Although very promising in its former theoretical testing capabilities (it would have been able to test even moving vehicles on it), for reasons of space, cost and safety, the initial design of the installation was then reduced to the most interesting and promising of its own subsystems, i.e.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Facility For Statically Testing The Stability Of Vehicles: Technical Features And Possibilities

Bietresato¹,

Mazzetto²

2022

Int. J. TDI

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The stability of a vehicle (especially if operating off-road, such as a farm tractor, possibly with an implement attached) can be statically investigated by means of a test installation such as the one described here. It consists of a platform (dimensions: 6.42 × 4.46 m) having two degrees of freedom (inclination, rotation) and on which the vehicle is positioned motionless. By acting on these degrees of freedom, it is possible to precisely and simultaneously control all the characteristic angles of a vehicle (roll, pitch, yaw), thus discovering, in complete safety, its operational limits (i.e. its incipient rollover conditions). Furthermore, the ability to misalign up to two of the four quadrants composing the platform allows the testing of further critical situations for the vehicle, in which the front-axle pivot joint and the tyres elasticity are involved, potentially up to a scenario in which the vehicle rests on only three of its four supports and its support polygon degenerates into a triangle. The basic test scenarios that can be investigated with this installation allow the study of many aspects of a vehicle, pertaining both to the general chassis performance of the vehicle (therefore related to its balance) and to the load state of some specific components (internal or interfacing the vehicle with the outside, e.g. the wheels). The obtained data, referred to reference test scenarios, allow the experimenters to: (1) interpret sensors readings in real operating situations, thus including also the contribution of the tyres vertical flattening and lateral deflection, (2) complete the safety documentation at the users' disposal with some specific graphs, the vehicle 'equilibrium maps' (or 'stability charts'), possibly referred also to the vehicle with some accessories/implements connected to it. By demonstrating the undeniable usefulness of such an installation, the authors hope to propose new testing paradigms with the ultimate aim of increasing the overall safety of vehicles and, particularly, of agricultural and work machinery.

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Section: Technical Features Of the Test Installationsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

A Novel Facility For Statically Testing The Stability Of Vehicles: Technical Features And Possibilities

Bietresato¹,

Mazzetto²

2022

Int. J. TDI

Self Cite

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“…Such machines must also be assessed in terms of stability due to their work in a terrain with longitudinal and transverse slopes. For this purpose, both static and dynamic models as well as the results of empirical research are used [29,30]. As regards articulated mining machines, a number of works related to drilling rigs and bucket loaders can be indicated.…”

Section: Literature Reviewmentioning

confidence: 99%

Assessment of the Stability of Bev Lhd Loader

Bołoz

Kozłowski

Horak

2022

Management Systems in Production Engineering

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The article concerns the computational model for analysing the stability of the BEV LHD loader. Works were carried out to develop an innovative, light battery-powered loader, which was the subject of an R&D project implemented in cooperation with Bumech S. A. Compared to the existing solutions of loaders with similar load capacity, this one is distinguished by the use of an individual electric drive in each wheel and a replaceable battery. A physical and mathematical model was developed taking into account the specificity of the BEV LHD loader. In the model, the masses of the battery, individual drives, the platform and excavated material are taken into account separately. The developed model allows determining the loader wheel pressure on the floor, depending on the location of its components’ centres of gravity, the turning angle of the machine, the amount of excavated material in the bucket and the position of the bucket. The input parameters also include the longitudinal and transverse excavation slope angles. In addition, the model enables determining the inner and outer turning radius of the loader. To verify the theoretical model, dynamic simulation tests were carried out. The results of simulation analyses confirmed the correctness of the developed theoretical model. The model was used to prepare a calculation sheet for analysing the stability on the basis of the adopted parameters. In the article, selected results of the conducted stability analyses have been presented, along with the proposed parameters ensuring the loader’s stability. The developed theoretical model enables a quick assessment of the loader’s stability, which, due to a number of innovative solutions, differs from existing designs. The structure of the loader at the design stage is subject to numerous modifications, which affect the distribution of the centres of gravity of individual components. The developed model of the loader is a useful, parameterized tool that allows assessing the stability and the values of the turning radii of the machine.

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“…This geometrical condition could happen when there is a modification of the direction of the above-cited resultant (e.g., in the case of irrigation systems, when there is a strong wind impacting on the frame) or when the support plane changes locally its inclination (e.g., in the case of self-propelled irrigation systems, due to the harshness of the ground experienced by the system wheels) [15]. In the agricultural engineering field, this phenomenon has been investigated especially with reference to farm tractors [16][17][18][19][20] but also to robots [21]. Indeed, the side-overturning of agricultural machines is a very important problem because it is the principal cause of deaths recorded every year [22][23][24][25][26][27].…”

Section: The Risk Of Rollover Of Irrigation Systemsmentioning

confidence: 99%

Morphometry as a Key to Investigate the Stability to a Wind-Induced Rollover of Agricultural Equipment for Irrigation

Bietresato¹,

Mazzetto²

2020

IJSSE

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A problem that is common in agriculture but not very publicized, thanks to the absence of victims, is the rollover of Centre Pivot and Lateral Move irrigation systems. These accidents are due to particularly-strong winds acting on the spans, and they are potentially very destructive for the installations. Also, the restoration phase of the installations requires always an intervention of lifting of the machinery on the field, with a potential further damage to crops (setting) and land (compaction). Given the basic inevitability of the phenomenon, due to atmospheric events, these rollovers could be however limited e.g. by proposing a system design granting a higher stability. Therefore, we have firstly modelled the rollover dynamics of these systems, considering the geometry, the masses, the forces acting on them (wind, gravity), the position of the centre of gravity. Then, thanks to morphometry, we have investigated booms' stability as a consequence of a proportional or not-proportional alteration of the system sizes, in particular: the upscaling of supports, done by some manufacturers, and the lengthening of spans, often required by customers. Morphometry is a method born in biology, typically used to describe and analyse statistically the shape variations within and among samples of organisms as a result of growth, experimental treatments or evolution. As the idea of evolutionary adaptation is intrinsic in the technical evolution of human-made systems (models, variants) operated by manufacturers, also artificial systems can be studied or improved via the morphometry, as operated here. The output of this study is a physical model of rollover and a sensitivity analysis of a reference configuration for an irrigation boom. Thanks to these analyses, we were able to demonstrate, for example, how a scaling-up of boom supports, respectful of geometric ratios, can increase the system stability despite the elevation of the pressure point of the wind on the frame.

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Definition of the Layout for a New Facility to Test the Static and Dynamic Stability of Agricultural Vehicles Operating on Sloping Grounds

Cited by 14 publications

References 61 publications

A Novel Facility For Statically Testing The Stability Of Vehicles: Technical Features And Possibilities

A Novel Facility For Statically Testing The Stability Of Vehicles: Technical Features And Possibilities

Assessment of the Stability of Bev Lhd Loader

Morphometry as a Key to Investigate the Stability to a Wind-Induced Rollover of Agricultural Equipment for Irrigation

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