The Effects of Vertical Sprayer Boom Movements on the Uniformity of Spray Distribution

Langenakens, J.; Clijmans, Luc; Ramón, Herman; Baerdemaeker, Josse De

doi:10.1006/jaer.1999.0464

Cited by 30 publications

(24 citation statements)

References 4 publications

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“…Further, we shall assume the boom to be rigid. Incidentally, this latter assumption is confirmed as reasonable by the manufacturer of the machine (based on empirical observations) and by Parloo et al (2005), Clijmans et al (2000), Langenakens et al (1999) and Anthonis et al (2005) on the basis that the resonant frequency of vertical boom suspensions for long booms is generally of the order of 0.1 Hz and the first flexible vertical mode is usually located in the range between 0.6-1.5 Hz.…”

Section: The Design Problemmentioning

confidence: 56%

Improving machine dynamics via geometry optimization

Tudose

Stănescu

Sóbester

2011

Struct Multidisc Optim

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The central thesis of this paper is that the dynamic performance of machinery can be improved dramatically in certain cases through a systematic and meticulous evolutionary algorithm search through the space of all structural geometries permitted by manufacturing, cost and functional constraints. This is a cheap and elegant approach in scenarios where employing active control elements is impractical for reasons of cost and complexity. From an optimization perspective the challenge lies in the efficient, yet thorough global exploration of the multi-dimensional and multi-modal design spaces often yielded by such problems. Moreover, the designs are often defined by a mixture of continuous and discrete variables-a task that evolutionary algorithms appear to be ideally suited for. In this article we discuss the specific case of the optimization of crop spraying machinery for improved uniformity of spray deposition, subject to structural weight and manufacturing constraints. Using a mixed variable evolutionary algorithm allowed us to optimize both shape and topology. Through this process we have managed to reduce the maximum roll angle of the sprayer by an order of magnitude, whilst allowing only relatively inexpensive changes to the baseline design. Further (though less dramatic) improvements were shown to be possible when we relaxed the cost constraint. We applied the same approach to the inverse problem of reducing the mass while maintaining an acceptable roll angle-a 2% improvement proved possible in this case.

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Section: The Design Problemmentioning

confidence: 56%

Improving machine dynamics via geometry optimization

Tudose

Stănescu

Sóbester

2011

Struct Multidisc Optim

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“…However, when height control is applied, this CV value decreases to 5.17%, 4.98%, 4.09% respectively for driving speeds of 12, 8 and 4 km h -1 . The reason for the increase in CV value with the increase in speed can be explained as follows; The increase in the driving speed reduces the measurement accuracy of the ultrasonic sensor (Iida & Bursk 2002;Zaman et al 2007;Koc & Keskin 2011), causing the test platform vibration to increase (Langenakens et al 1999;Pontelli & Mucheroni 2012). WSP card samples obtained from field trials for three driving speed are shown in Table 5, where the number under each sample represents the percentage of the…”

Section: Field Tests Resultsmentioning

confidence: 99%

“…For wide-angle nozzles, a lower spray height is preferred. For example, for a nozzle spacing of 50 cm, a spray height of 50 cm is recommended at a 110° nozzle angle (Langenakens et al 1999;Wilson et al 2008). However, when the spray is being applied, the spray height is constantly changing due to fluctuations in the land structure, to hills, tyres and vertical vibrations.…”

Section: Introductionmentioning

confidence: 99%

Design of a Nozzle-Height Control System Using a Permanent Magnet Tubular Linear Synchronous Motor

Ilıca

Boz

2018

Tarım Bilimleri Dergisi

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In agricultural spraying, keeping the spray at the correct height reduces pesticide drift and provides uniformly distributed pesticide accumulation on the target plant. In this study, an agricultural nozzle-height control test system was developed using a permanent magnet tubular linear synchronous motor (PMTLSM) that can adjust the height between the spraying nozzle and the plant. The developed system was experimentally tested in the laboratory environment and under field conditions. According to the experimental results, the nozzle height coefficient of variation (CV) value decreased from 16.77% to 5.17%, while the uniformity of distribution in the forward direction increased from 56.57% to 86.11% at 12 km h-1 under field conditions. Under test conditions it was found that the developed system keeps the distance between differently sized plants and the nozzle at the set point with minimum error.

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“…The boom sprayers are widely used in crop protection on the fields against diseases, weeds, pathogens, and others [2,3] . The width of the mainstream boom sprayer in China is about 10-24 m, unwanted boom motions typically occur when sprayer tires go over uneven terrain field surfaces [4,5] . Spray boom motions, mainly vertically rolling has a dramatic effect on the spray distribution pattern [6,7] .…”

Section: Introductionmentioning

confidence: 99%

Design and experiment of electro hydraulic active suspension for controlling the rolling motion of spray boom

Cui¹,

Xue²,

Le³

et al. 2019

International Journal of Agricultural and Biological Engineering

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Boom sprayer is one of the most commonly used plant protection machinery for spraying pesticide. Studies have shown that the efficiency of chemicals is highly correlated with the uniformity of spray distribution patterns. As the boom is a large and flexible structure, boom rolling leads to overlapping and leakage of the pesticides. In order to improve spray uniformity, the boom attitude should be kept parallel to the ground slope or to the crop canopy beneath the boom. Passive suspension can attenuate frequencies above its resonance frequency, but nothing can be done to align the boom to the sloping ground. Therefore, an active suspension system is designed, which includes DSP-based controller, a servo valve, a hydraulic cylinder, two ultrasonic sensors, one inertial attitude sensor, and the developed control procedures. In order to prevent the wrong response of the control system caused by the high frequency component due to uneven crop canopy or rough ground. A special signal processing algorithm was proposed, including the limiting filter, smoothing algorithm and data fusion algorithm based on optimal weight. The transient and steady-state performances of the boom control system using velocity feedforward PID algorithm were tested on a six DOF motion simulator. It can be seen that the low-frequency tracking performance of the boom was greatly improved after the electro-hydraulic active suspension was added. At the resonance frequency, the peak angle of active suspension and passive suspensions are 0.72° and 1.29° respectively, and the resonance peak is greatly reduced. The controller was implemented on a self-propelled boom sprayer and validated under field conditions, the standard deviation of the roll angle of the boom with active suspension is 0.40°, compared with 1.04° of the sprayer chassis. Experimental results show that the active suspension control system can effectively reduce the effect of ground excitation disturbance on the application process, and has good tracking performance for low frequency terrain change.

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The Effects of Vertical Sprayer Boom Movements on the Uniformity of Spray Distribution

Cited by 30 publications

References 4 publications

Improving machine dynamics via geometry optimization

Improving machine dynamics via geometry optimization

Design of a Nozzle-Height Control System Using a Permanent Magnet Tubular Linear Synchronous Motor

Design and experiment of electro hydraulic active suspension for controlling the rolling motion of spray boom

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