Development of stability indicators for dynamic Phase I overturn of conventional farm tractors with front axle pivot

Li, Zhen; Mitsuoka, Muneshi; Inoue, Eiji; Okayasu, Takashi; Hirai, Yasumaru

doi:10.1016/j.biosystemseng.2015.03.016

Cited by 34 publications

(15 citation statements)

References 29 publications

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“…Most of serious accidents in this sector occur while using self-propelled machines, and in particular tractors [8][9][10][11], because of:…”

Section: Introductionmentioning

confidence: 99%

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Prioritization of hazards by means of a QFD- based procedure

Lombardi¹,

Fargnoli²

2018

Int. J. SAFE

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Despite the evolution of regulations in the field of occupational health and safety promoted in EU countries, the number of accidents and victims has not significantly decreased in recent years, especially in constructions and agriculture sectors, as underlined by official reports of the Italian Workers' Compensation Authority. Main reasons of such a situation are due to the characteristics of working activities in these sectors. The variety of operations, the frequent exchange of tasks among workers within the same company, the continuous change of workplaces, the frequent exchange of workers for the same activity (e.g. seasonal workers), and the workers' stress caused by seasonal jobs. For these reasons both risk assessment and safety management activities result in being more difficult than in other working sectors. Thus, it is important to provide methodologies and tools that allow companies to carry out these tasks more effectively. In such a context, the study proposed by Esra Bas in 2014 certainly represents an attempt to provide a supporting methodology for engineers engaged in risk assessment activities. This approach consists in the use of the Quality Function Deployment (QFD) method, and it is aimed at evaluating how specific tasks can be in relationship with specific hazards, which in turn are related to specific events, and finally at defining what preventive/protective measures can be introduced against those events. Based on this, we tried to further investigate such an approach, with the goal of providing an easier-to-use tool, which can be used in risk assessment activities of critical contexts as the agriculture one. With this aim in mind, a case study concerning the risk assessment of an agricultural machinery was carried out. Keywords: agricultural equipment, house of quality, machinery safety, occupational safety, quality function deployment, risk assessment 1 INTRODUCTION In last decades, regulations concerning occupational health and safety, as well as machinery safety have become more and more severe. Despite this, in most of EU countries the number of accidents and victims has not significantly decreased [1,2]. Similarly, also in other developed countries such a phenomenon is perceived [3][4][5][6]. In particular, considering the Italian context, the occurrence of serious injuries and fatalities is very critical in the agriculture activities, where the compliance with new safety requirements results in being more difficult, due to the specific characteristics of the sector [7]. Actually, it has to be underlined that difficulties related with the implementation of safety measures are numerous, in particular for small and medium sized companies (SMEs), which can hardly afford additional costs for the compliance with safety requirements. SMEs represent more than the 80% of enterprises operating in the agricultural sector in Italy, and most of them are family-owned companies. Moreover, the number of part-time workers is also consistent.Most of serious accidents in this sector occur w...

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“…Most of serious accidents in this sector occur while using self-propelled machines, and in particular tractors [8][9][10][11], because of:…”

Section: Introductionmentioning

confidence: 99%

“…SMEs represent more than the 80% of enterprises operating in the agricultural sector in Italy, and most of them are family-owned companies. Moreover, the number of part-time workers is also consistent.Most of serious accidents in this sector occur while using self-propelled machines, and in particular tractors [8][9][10][11], because of: …”

mentioning

confidence: 99%

Prioritization of hazards by means of a QFD- based procedure

Lombardi¹,

Fargnoli²

2018

Int. J. SAFE

View full text Add to dashboard Cite

show abstract

“…For example, in a multibody model of a tractor, Melzi et al [32] used not only the spring-damper elements to represent the suspension system but also the rigid body to represent vehicle chassis, cabin, and the seat with different DOFs (yaw, pitch, and roll). Considering that the tractor consists of a rotatable front end (anterior part) and the main body (posterior part), Li et al [33] analysed the pitch motion of the front part of the tractor as well as the roll motion of the rear part of the tractor and predicted tractor behaviour when a tire is off the ground. In vehicle driving simulations, Sim et al [34] established three-dimensional vehicle dynamic models containing the seat, cabin, body, and tires with a 14-DOF model which describes the bounce, pitch, roll, longitudinal response, and lateral response of the tractor's seat, cabin, and tire.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Vibration Characteristics for Agricultural Wheeled Tractor with Implement and Front Axle Hydropneumatic Suspension

Zheng

Cui

Yang

et al. 2019

Shock and Vibration

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The dynamic model is significant for the analysis of the vibrational characteristics of the wheeled tractor system with implement and front axle hydropneumatic suspension. In this work, the nonlinear stiffness and damping equations are derived first. The dynamic coupling relationship among cabin, three-point hitch structure, and implement are figured out, and the dynamic model of the half agricultural wheeled tractor/implement system is presented considering the effects of three-point hitch structure, passive silent blocks of cabin, and front axle hydropneumatic suspension together. To validate the model, the power spectral densities (PSDs) of the driver seat, cabin, chassis, and implement acquired from numerical simulations are compared with those from experiments, respectively. Under different forward speeds, two groups of results match well. Based on the model, the influences of passive cabin suspension, implement, and front axle hydropneumatic suspension on the dynamical characteristics of the tractor system are investigated. Results indicate that the front axle hydropneumatic suspension will deteriorate the ride comfort of the driver but improve the handing stability. The passive cabin suspension reduces the operational stability while improving much more ride comfort than the front axle hydropneumatic suspension does. The driver’s comfortableness will be increased due to implement; meanwhile, handling stability will be compromised. Besides, the impacts of initial nitrogen volume, pressure of accumulators, and orifice diameter of throttle valves on the vibration characteristics of the tractor system are also inspected.

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“…In most relevant research works, obstacles with designated shapes are preferred for the convenience of modelling, simulation, and verification. To stimulate stability abnormity for the further observation of behaviors, half-sine-curve-shaped, triangular, rectangular, and cobblestone-shaped obstacles are commonly used as part of an uneven road for the target tractor to travel over [39][40][41][42] . Meanwhile, earlier measurements made from a realistic perspective show a remarkable diversity of farming ground conditions and high randomness in road profiles [29][30][31] .…”

Section: Introduction mentioning

confidence: 99%

Factorial significance on tractor stability under variation of terrain roughness employing the Taguchi method

Zhu

Qin

et al. 2018

International Journal of Agricultural and Biological Engineering

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Tractor rollover accidents remain an issue with the development of agricultural mechanization. Adopting the scale-model-based experimental approach, this study investigated the three most influential geometric factors of tractor in various agricultural ground conditions with improved configuration of force sensing system. The initiation of tractor rollover, associated with the tire-ground contact status, was investigated for various front tire types, ballast weights, and rear track widths. Employing the Taguchi method, the ground reaction forces applied to the tractor's uphill wheels were measured and evaluated using stability indicators. By taking this approach, the effects and statistical significance of the three factors and their interactions were examined under various agricultural ground conditions. Results showed that the ballast weight significantly affected the ground contact status of the uphill front tire. The significance of the front tire type gradually increased as the road roughness increased, but dramatically decreased for an extremely rough road surface. Furthermore, none of the factors or interactions, except the factor of the rear track width for relatively rough roads, was statistically significant. The study revealed that not all commonly discussed factors consistently affect tractor stability. The results of the present study are thus expected to provide a reference explaining how to explore the necessity and feasibility of parameter adjustment before reconfiguring a tractor for higher stability. Citation: Li Z, Zhu Z X, Qin J H, Mao E R, Mitsuoka M, Inoue E, et al. Factorial significance on tractor stability under variation of terrain roughness employing the Taguchi method. Int J Agric & Biol Eng, 2018; 11(5): 88-94.

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Development of stability indicators for dynamic Phase I overturn of conventional farm tractors with front axle pivot

Cited by 34 publications

References 29 publications

Prioritization of hazards by means of a QFD- based procedure

Prioritization of hazards by means of a QFD- based procedure

Simulation of the Vibration Characteristics for Agricultural Wheeled Tractor with Implement and Front Axle Hydropneumatic Suspension

Factorial significance on tractor stability under variation of terrain roughness employing the Taguchi method

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