Study on the variation characteristics of vertical equivalent damping ratio of tire–soil system using semi-empirical model

Cường, Đỗ Minh; Zhu, Shengyang; Ngọc, Ninh Thị

doi:10.1016/j.jterra.2013.10.002

Cited by 16 publications

(13 citation statements)

References 17 publications

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“…e low-frequency vibration experienced by an agricultural tractor comes from the interaction between the tractor and the rough terrain [1][2][3][4]. It is severe when primary tractors only have the tires as the elastic component between the road and the tractor [5,6], for the reason that tires are unable to provide proper suspension characteristics required to absorb these vibrations.…”

Section: Introductionmentioning

confidence: 99%

“…Especially the onedimensional quarter-vehicle models with single or two DOF are commonly used to study the heave motion of the tractor body [24]. Cuong et al [4] modeled tire-soil system as an equivalent system by the mechanism of a linear parallel spring and damper in vertical the direction with one end connected to the tire axle and the other end connected to the hard layer. To calculate the structural parameters of the hydropneumatic spring, Yuan et al [25] established a vibration model of the front axle suspension tractor and the stiffness and damping nonlinear mathematical model of the hydropneumatic spring.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Howard and Seraji (2001) used a mobile robot with a vision system and used an Artificial Neural Network (ANN) for real time terrain characterization. Cuong et al (2014) designed a test rig and used it to measure the vertical damping ratio of tire-soil system using freevibration logarithmic decay method.…”

Section: Introductionmentioning

confidence: 99%

Terrain classification using intelligent tire

Khaleghian

Taheri

2017

Journal of Terramechanics

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A wheeled ground robot was designed and built for better understanding of the challenges involved in utilization of accelerometerbased intelligent tires for mobility improvements. Since robot traction forces depend on the surface type and the friction associated with the tire-road interaction, the measured acceleration signals were used for terrain classification and surface characterization. To accomplish this, the robot was instrumented with appropriate sensors (a tri-axial accelerometer attached to the tire innerliner, a single axis accelerometer attached to the robot chassis and wheel speed sensors) and a data acquisition system. Wheel slip was measured accurately using encoders attached to driven and non-driven wheels. A fuzzy logic algorithm was developed and used for terrain classification. This algorithm uses the power of the acceleration signal and wheel slip ratio as inputs and classifies all different surfaces into four main categories; asphalt, concrete, grass, and sand. The performance of the algorithm was evaluated using experimental data and good agreements were observed between the surface types and estimated ones.

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“…On agricultural tractors, low-frequency vibration is produced mainly by the interaction between the tractor and the terrain, depending upon the terrain type and the speed of travel [Cuong et al, 2013]. Also the tyre inflation pressure and the soil moisture content can affect sometime remarkably the RMS acceleration values at the driver's seat, because on tractor having no suspension system the tyre is the unique elastic element able to reduce tractor vibration [Cuong et al, 2014]. The demand for higher forward speeds in agricultural tasks and the increasing use of specialised transport-oriented vehicles have introduced new technical problems related to dynamic behaviour, such as general deterioration associated with high speeds.…”

Section: Introductionmentioning

confidence: 99%

Comfort efficiency of the front axle suspension in off-road operations of a medium-powered agricultural tractor

Giordano¹,

Facchinetti²,

Pessina³

2015

ces

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The whole-body vibration transmitted through the seat of a 4WD modern tractor of 81 kW max power, equipped with seat, cab and front axle suspension systems were measured and analysed according to the official relevant Standards. The test conditions involved the travelling speed (from 1.11 to 4.44 m s -1 ), the surface feature (field and rough track), the type of task (tractor alone and coupled with a towed slurry tank) and the front axle suspension condition (working or locked). After their statistical validation, the results highlight a good efficiency of the front axle suspension in reducing the vibration levels of the tractor alone, while when coupled with the slurry tank the benefit is less evident, especially in the back-front direction. The lower limit provided by the 2002/44 EC Directive ("action value", 0.5 m s -2 ) is generally exceeded in all the three axes, apart when travelling at the lowest speed. 1312 Davide M. Giordano et al.Vice versa, the vibration levels exceed the higher limit ("limit value", 1.0 m s -2 ) only if the overall RMS values are considered, in the field at 2.22 m s -1 and on the rough track at 4.44 m s -1 .

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Study on the variation characteristics of vertical equivalent damping ratio of tire–soil system using semi-empirical model

Cited by 16 publications

References 17 publications

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

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

Terrain classification using intelligent tire

Comfort efficiency of the front axle suspension in off-road operations of a medium-powered agricultural tractor

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