Structural Modification Effects on the Dynamic Behavior of an Agricultural Tractor

Clijmans, Luc; Ramón, Herman; Baerdemaeker, Josse De

doi:10.13031/2013.17145

Cited by 24 publications

(10 citation statements)

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“…It was connected to a function generator and power amplifier to produce the sinusoidal wave excitations at 2.2 Hz and 4.4 Hz frequencies. The operating range of frequency between 0.5 Hz to 5 Hz was in-line with those used by other researchers (Clijmans et al., 1998; Pochi and Vannucci, 2001). The ranges of the frequency were however set to 2.2 Hz and 4.4 Hz, respectively due to the corresponding minimum and maximum forward tractor speeds (Bukta et al., 2002; Ohmiya, 1991).…”

Section: Experimental Set Upsupporting

confidence: 84%

Vibration suppression of sprayer boom structure using active torque control and iterative learning. Part II: Experimental implementation

Tahmasebi

Gohari

Mailah

et al. 2017

Journal of Vibration and Control

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The most common technique of protecting crops from diseases is by applying a chemical process whereby a mixture of chemicals and water are sprayed onto the crops via a sprayer. Nowadays, modern sprayers are generally implemented to suspension systems for reducing the unwanted vibration of the spray boom structure to improve the uniformity of spray distribution in the agricultural field environment. This paper serves to present a new alternative to address and resolve the vibration control problem of the moving sprayer structures. The application of an active torque control (ATC) method to cancel the undesired vibration of the sprayer boom is thus proposed. As a continuation from Part I that deals with the modeling and simulation aspect, Part II explains the practical facet of the study through the implementation of ATC and iterative learning (ATCAIL) control scheme to an experimental spray boom structure as a basis to validate the effectiveness and robustness of the scheme as simulated and described at length in Part I. A sprayer boom suspension system test rig was specifically designed and developed to verify this control scheme that was principally chosen due to its ease of implementation through the exploitation of simple proportional–integral–derivative (PID), ATC and iterative learning algorithms. The system performance was evaluated and compared to the PID and ATC–PID control schemes for benchmarking. The results demonstrate the capability of the practical ATCAIL scheme to improve the vibration suppression in both time and frequency domains, thereafter guaranteeing a more uniform spray distribution of chemicals on a bumpy terrain. The experimental outcomes are in good agreements with the simulation counterpart.

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Section: Experimental Set Upsupporting

confidence: 84%

Vibration suppression of sprayer boom structure using active torque control and iterative learning. Part II: Experimental implementation

Tahmasebi

Gohari

Mailah

et al. 2017

Journal of Vibration and Control

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“…e site map and the test rig are demonstrated in Figure 6. e test rig system includes support frame (1), acceleration sensor (2), weight plate (3), rings (4), tire (5), rope (6), beam (7), linear bearing beam (8), displacement sensor (9), holder of sensor (10), suction plate (11), suspension bracket of magnetic lifter (12), magnetic lifter (13), ground (14), tire connection plate (15), linear bearing (16), and guide rods (17).…”

Section: Derivation Procedures Of Model Parametersmentioning

confidence: 99%

“…One is the experimental approach, and the other is the computer simulation method. In the aspect of the experimental approach, Clijmans et al [14] used the experimental modal analysis technique to predict the structural behaviour of the machine under a set of excitation conditions. When studying the effects of vibration on drivers, Cutini et al [15] operated three agricultural tractors on six test tracks at different forward speeds to evaluate the whole body vibration of the agricultural tractor's operator.…”

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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“…Agricultural vehicles are generally designed without suspension systems; tires therefore represent the only suspension components working as both spring and damping elements (Clijmans et al 1998). Many researchers have extensively studied vibrations on tractors using analytical and experimental approaches (Balasubramanian 2006;Dworecki et al 2005;Clijmans et al 1998) and have also observed the effect of vibration on LIDAR sensors (Lee and Ehsani 2008;Doerr 2009;Doerr et al 2014). However, there remains a need to develop and evaluate appropriate stabilization systems that could reduce the effects of vibrations on LIDAR sensors.…”

Section: Introductionmentioning

confidence: 99%

Isolation of Vibrations Transmitted to a LIDAR Sensor Mounted on an Agricultural Vehicle to Improve Obstacle Detection.

McLaughlin¹

2013

Can. Biosyst. Eng.

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Isolation of Vibrations Transmitted to a LIDAR SensorMounted on an Agricultural Vehicle to Improve Obstacle Detection. Canadian Biosystems Engineering/Le génie des biosystèmes au Canada 55: 2.33-2.42. LIDAR (LIght Detection And Ranging) technology can be used on autonomous agricultural vehicles for guidance and obstacle detection purposes. However, the quality of LIDAR measurements can be affected by mechanical vibrations induced by the operation of these vehicles on uneven terrain. The objective of this study was to develop a stabilizing system and to evaluate its effectiveness at reducing the transmission of mechanical vibrations to a LIDAR sensor installed on an agricultural tractor for the purpose of reducing the positioning error of obstacles during field operation. Special support bars (S) and stabilization system (SS) were designed for a SICK LMS 291-S14 LIDAR sensor mounted on an agricultural tractor. The positioning error of the sensor was assessed in field experiments by determining the difference between the known location of obstacles and their corresponding estimated locations from the sensor measurements. Increasing tractor speed had a negative effect on the accuracy of the sensor with an increase in the positioning error of up to 27%. The addition of the S system positively affected the accuracy of the sensor and resulted in a 41% decrease of the average positioning error from 340 to 201 mm. Finally, the addition of the SS system decreased the average positioning error by 57% from 382 to 161 mm.

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Structural Modification Effects on the Dynamic Behavior of an Agricultural Tractor

Cited by 24 publications

References 0 publications

Vibration suppression of sprayer boom structure using active torque control and iterative learning. Part II: Experimental implementation

Vibration suppression of sprayer boom structure using active torque control and iterative learning. Part II: Experimental implementation

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

Isolation of Vibrations Transmitted to a LIDAR Sensor Mounted on an Agricultural Vehicle to Improve Obstacle Detection.

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