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Littérature scientifique sur le sujet « Calibration of sprayers »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Calibration of sprayers"

Kasner, Edward J., Richard A. Fenske, Gwen A. Hoheisel, Kit Galvin, Magali N. Blanco, Edmund Y. W. Seto et Michael G. Yost. « Spray Drift from Three Airblast Sprayer Technologies in a Modern Orchard Work Environment ». Annals of Work Exposures and Health 64, n^o 1 (1 décembre 2019) : 25–37. http://dx.doi.org/10.1093/annweh/wxz080.

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Abstract Pesticide spray drift represents an important exposure pathway that may cause illness among orchard workers. To strike a balance between improving spray coverage and reducing drift, new sprayer technologies are being marketed for use in modern tree canopies to replace conventional axial fan airblast (AFA) sprayers that have been used widely since the 1950s. We designed a series of spray trials that used mixed-effects modeling to compare tracer-based drift volume levels for old and new sprayer technologies in an orchard work environment. Building on a smaller study of 6 trials (168 tree rows) that collected polyester line drift samples (n = 270 measurements) suspended on 15 vertical masts downwind of an AFA sprayer application, this study included 9 additional comparison trials (252 tree rows; n = 405 measurements) for 2 airblast tower sprayers: the directed air tower (DAT) and the multi-headed fan tower (MFT). Field-based measurements at mid (26 m) and far (52 m) distances showed that the DAT and MFT sprayers had 4–15 and 35–37% less drift than the AFA. After controlling for downwind distance, sampling height, and wind speed, model results indicated that the MFT [−35%; 95% confidence interval (CI): −22 and −49%; P < 0.001] significantly reduced drift levels compared to the AFA, but the DAT did not (−7%; 95% CI: −19 and 6%; P = 0.29). Tower sprayers appear to be a promising means by which to decrease drift levels through shorter nozzle-to-tree canopy distances and more horizontally directed aerosols that escape the tree canopy to a lesser extent. Substitution of these new technologies for AFA sprayers is likely to reduce the frequency and magnitude of pesticide drift exposures and associated illnesses. These findings, especially for the MFT, may fit United States Environmental Protection Agency’s Drift Reduction Technology (DRT) one-star rating of 25–50% reduction. An ‘AFA buyback’ incentive program could be developed to stimulate wider adoption of new drift-reducing spray technologies. However, improved sprayer technologies alone do not eliminate drift. Applicator training, including proper sprayer calibration and maintenance, and application exclusion zones (AEZs) can also contribute to minimizing the risks of drift exposure. With regard to testing DRTs and establishing AEZs, our study findings demonstrate the need to define the impact of airblast sprayer type, orchard architecture, sampling height, and wind speed.

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Drincha, V. M., Yu A. Sergeyev et A. O. Sharibura. « Calibration of field sprayers and modern devices for its realization ». Traktory i sel hozmashiny 79, n^o 5 (15 mai 2012) : 8–11. http://dx.doi.org/10.17816/0321-4443-69339.

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Peñaloza, Elmer A. G., Paulo E. Cruvinel, Vilma A. Oliveira et Augusto G. F. Costa. « A Model Approach to Infer the Quality in Agricultural Sprayers Supported by Knowledge Bases and Experimental Measurements ». International Journal of Semantic Computing 11, n^o 03 (septembre 2017) : 279–92. http://dx.doi.org/10.1142/s1793351x17400104.

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This paper presents a method to infer the quality of sprayers based on data collection of the drop spectra and their physical descriptors, which are used to generate a knowledge base to support decision-making in agriculture. The knowledge base is formed by collected experimental data, obtained in a controlled environment under specific operating conditions, and the semantics used in the spraying process to infer the quality in the application. The electro-hydraulic operating conditions of the sprayer system, which include speed and flow measurements, are used to define experimental tests, perform calibration of the spray booms and select the nozzle types. Using the Grubbs test and the quartile-quartile plot an exploratory analysis of the collected data was made in order to determine the data consistency, the deviation of atypical values, the independence between the data of each test, the repeatability and the normal representation of them. Therefore, integrating measurements to a knowledge base it was possible to improve the decision-making in relation to the quality of the spraying process defined in terms of a distribution function. Results shown that the use of advanced models and semantic interpretation improved the decision-making processes related to the quality of the agricultural sprayers.

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Mion, Renildo L., Beatriz M. de Sousa, Igor M. Cordeiro, Weberte A. Sombra, José M. de L. Duarte et Fidel C. B. Lucas. « Calibration of angles of nozzles and deposition of an axial-flow sprayer on dwarf cashew ». Engenharia Agrícola 32, n^o 4 (août 2012) : 802–9. http://dx.doi.org/10.1590/s0100-69162012000400020.

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The study aimed to determine an optimum angle for the nozzles axial-flow sprayers a deposition for better vertical distribution focused on cashew. In laboratory tests were conducted adjusting the angle of the nozzle axial-flow sprayers. The experimental design was randomized blocks in a 2x3 factorial with four replications. The treatment for this test were two settings (with and without the adjustment of the angles of the nozzles ) and tree application volumes 273, 699 and 954 L ha-¹.The study was conducted in an orchard of dwarf cashew, with eight years of age. It was concluded that the volumetric distribution profile showed better vertical distribution uniformity when the angles of the nozzles were regulated for the canopy, the adjustment of the angles of the nozzles for the canopy provided greater deposition of droplets, the increased volume of application resulted in higher depositions in the leaves of the crop.

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Mosetti, Davide, Paolo Sivilotti et Giovanni Bigot. « The calibration of the sprayers and the factors involved in coverage uniformity in the vineyard ». BIO Web of Conferences 13 (2019) : 02001. http://dx.doi.org/10.1051/bioconf/20191302001.

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The phytopathological condition of the vineyard and the reduction in the use of crop protection products are closely linked to the efficiency of the use of sprayers. The objective of the work was to identify the best operative conditions to improve the canopy coverage of the spraying. From 2012 to 2017 173 field trials were carried out in 40 farms, on 24 varieties, testing 72 different sprayers in North Eastern Italy. Water-sensitive papers of 2.5 × 2.5 cm were positioned in eight points in the vine canopy according to a standardized method, and they were examined after spraying for spray deposition. In general, results showed that coverage of the lower leaf surface was very poor. On the contrary, the upper section of leaves in the outer canopy layers have received excessive spraying, over 70% coverage in 25% of cases. The coverage uniformity was improved by using driving speeds lower than 6 km / h and using upward air flow direction.

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Bahlol, Haitham Y., Abhilash K. Chandel, Gwen-Alyn Hoheisel et Lav R. Khot. « Smart Spray Analytical System for Orchard Sprayer Calibration : A-Proof-of-Concept and Preliminary Results ». Transactions of the ASABE 63, n^o 1 (2020) : 29–35. http://dx.doi.org/10.13031/trans.13196.

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Abstract. Efficient chemical spray applications are vital to reduce off-target drift, economic losses to tree fruit growers, and negative environmental impacts. It is thus important to adequately calibrate and adjust orchard sprayers for intended applications. This technical note describes the design, prototyping, and field evaluation of a sensor-based smart spray analytical system (SSAS). The SSAS is equipped with units for spray capturing and volumetric quantification, air-assist velocity measurement, system actuation and control, and data acquisition and wireless transmission. The spray liquid and air-assist velocity quantification units are assembled on a custom-made mobile frame for vertical stop-and-go movement to provide measurements at eight distinct sampling heights above ground level. The data acquisition and transmission units autonomously log the data on-board and transmit wirelessly to a receiving computer with time and height stamps for real-time graphical visualization. All these autonomous processes are guided by a custom programmable single-board computer. The SSAS was preliminarily evaluated for spray liquid and air-assist velocity pattern assessment of an air-assisted orchard sprayer in four sets of spray trials. An average spray liquid recovery of 14.03% and pertinent coefficient of variation (CV) of 10.73% were observed. An average CV of 11.93% was observed in the air-assist velocity patterns. Overall, the SSAS provided measurements within acceptable ranges of variation. This system can thus minimize the experimental errors, time, and efforts involved in conventional assessments of sprayer attributes, thereby providing a reliable solution for orchard sprayer calibration and adjustment. Keywords: Air-assist velocity pattern, Airblast sprayer calibration, Data storage and transmission, Graphical visualization, Smart spray analytical system, Spray liquid pattern.

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Rathnayake, Anura P., Ramesh K. Sahni, Lav R. Khot, Gwen A. Hoheisel et Heping Zhu. « Intelligent Sprayer Spray Rates Optimization to Efficiently Apply Chemicals in Modern Apple Orchards ». Journal of the ASABE 65, n^o 6 (2022) : 1411–20. http://dx.doi.org/10.13031/ja.14654.

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Highlights Intelligent sprayers require crop canopy-specific base spray rate (SR) adjustments. SRs can be estimated by Tree Row Volume (TRV) and Unit Canopy Row (UCR) methods. This study formulated TRV and UCR based SRs for modern apple orchard canopies. Field trials evaluated spray deposition and coverage variations for these rates. TRV and UCR based treatments had comparable spray performance to the grower-adapted application rate. Abstract. The efficiency of air-assisted sprayer-based chemical applications in horticultural crops is dependent on several factors, including that of the application rate as the amount of liquid per ground area (L ha-1 or gal acre-1 [GPA]). In contrast to the conventional GPA-based application rates, recently developed intelligent and precision sprayers use the input spray rate (SR) as the amount of liquid volume (L) required to spray one cubic meter of crop canopy (L m-3 or ounces per cubic foot). This input rate ranges between 0.06 and 0.13 L m-3 depending on the architecture and canopy size. However, the exact value of input SR is decided based on grower experience and manufacturer recommendation and can often be a broad estimation. Therefore, this study was conducted to explore methods that could be used to have a precise estimate of the input SR related to the canopy being sprayed for optimal spray applications. Tree row volume (TRV) and unit canopy row (UCR) methods were used to estimate input SRs and the sprayer field efficiency was evaluated in a vertical fruiting wall-trained commercial apple orchard, typical in the State of Washington, USA. Field spray trials were conducted in the full canopy growth stage, spraying a mix of fluorescent tracer dye of 2 g L-1 concentration at a calibration speed of 1.50 m s-1. Spray deposition and coverage were evaluated in replicated field trials using deposit samplers (mylar cards and screen) and water-sensitive papers, respectively. Test results demonstrated that both TRV (SR: 0.09 L m-3) and UCR (SR: 0.10 L m-3) were effective methods to calculate the spray rates since their spray deposition and coverage were comparable to that of the grower-adapted application rate (935 L ha-1). While the spray rates calculated by both methods provided better application efficiency, an SR of 0.09 L m-3 calculated by the TRV method would be preferable in spray applications of fully foliated fruiting wall-trained apple trees as it sprayed less liquid. Although the TRV method could potentially be applicable for estimating SR with an adjustment factor to compensate for the pruning level, crop-specific further evaluations are suggested for different canopy training systems. Keywords: Intelligent sprayer, Modern orchard systems, Spray rate, Tree row volume, Unit canopy row.

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Maličević, Z., J. Turan, B. Railić et D. Mitrović. « Effect of calibration on modern concepts of air assisted sprayers on application quality abstarct ». Savremena poljoprivredna tehnika 40, n^o 4 (2014) : 19–26. http://dx.doi.org/10.5937/savpoljteh1401019m.

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Lewis, Margaret T., et Kelly A. Hamby. « Optimizing Caneberry Spray Coverage for Drosophila suzukii (Diptera : Drosophilidae) Management on Diversified Fruit Farms ». Journal of Economic Entomology 113, n^o 6 (31 octobre 2020) : 2820–31. http://dx.doi.org/10.1093/jee/toaa237.

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Abstract Spray coverage may influence the efficacy of insecticides targeting the invasive vinegar fly Drosophila suzukii (Matsumura), a primary pest of raspberries and blackberries. In commercially managed caneberries, spray coverage is typically lowest in the inner and lower plant canopy, regions that overlap with higher levels of adult D. suzukii activity. To understand how spray coverage of fruit impacts efficacy against D. suzukii, laboratory bioassays were conducted using raspberries. In laboratory bioassays, higher spray coverage did not impact larval infestation rates but did increase adult mortality, indicating that flies can avoid a lethal dose of insecticide when applications do not achieve adequate coverage. We also evaluated how carrier water volume impacts spray coverage patterns throughout the canopy of raspberry and blackberry plants using both airblast and CO2 backpack sprayers. Increasing carrier water volume generally improved spray coverage in the lower plant canopy. However, effects in the upper plant canopy were inconsistent and varied between sprayer types. In addition to carrier water volume, other approaches, including adjusting the pesticide sprayer equipment used and/or sprayer calibration, should also be explored to improve coverage. Growers should evaluate spray coverage in their caneberries to identify and troubleshoot coverage issues. Results from this study indicate that taking the time to optimize this aspect of pesticide application may improve chemical management of D. suzukii and will likely also improve control of other important caneberry pests.

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Pergher, G. « Field evaluation of a calibration method for air-assisted sprayers involving the use of a vertical patternator ». Crop Protection 23, n^o 5 (mai 2004) : 437–46. http://dx.doi.org/10.1016/j.cropro.2003.09.015.

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Thèses sur le sujet "Calibration of sprayers"

Siqueira, José Luiz de 1964. « Inspeção periódica de pulverizadores : análise dos erros de calibração e impacto econômico / ». Botucatu : [s.n.], 2009. http://hdl.handle.net/11449/101944.

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Orientador: Ulisses Rocha Antuniassi
Banca: Paulo Roberto Arbex Silva
Banca: Kléber Pereira Lanças
Banca: Marco Antonio Gandolfo
Banca: Otavio Jorge Grigoli Abi Saab
Resumo: Os objetivos deste trabalho foram analisar os erros dos métodos usuais de calibração dos pulverizadores e quantificar o impacto econômico de problemas detectados na inspeção periódica de pulverizadores nas principais regiões produtoras de grãos no Brasil. A base do trabalho envolveu uma coleta de dados nos moldes do projeto IPP (Inspeção Periódica de Pulverizadores), englobando estudos dos equipamentos de pulverização de propriedades rurais nos Estados do Paraná (PR), Rio Grande do Sul (RS), Mato Grosso do Sul (MS) e Mato Grosso (MT). De posse da base de dados foram desenvolvidos modelos de simulação para avaliação dos métodos de calibração, estimativa de erros e dos prejuízos causados pelos mesmos. Os resultados mostraram que todas as máquinas apresentaram falhas de manutenção e calibração, com destaques para problemas no estado e conservação das pontas de pulverização. No MT 82,4% das pontas de pulverização encontravam-se inadequadas para o uso, seguido de PR com 72,5%, MS com 62,5% e RS 59,3%. Os erros na taxa de aplicação foram significativos, com valores de 70,6% para o PR, 60,2% para o RS, 37,5% para o MS e 61,8% para o MT. No que se refere ao método de calibração, o módulo dos erros médios de leitura do copo calibrador variaram de 1,8% (RS) a 2,7% (PR), enquanto o módulo dos erros médios de calibração do sensor de fluxo dos computadores variou de 5,3% (RS) a 8,8% (MT). A maior freqüência de prejuízos devido a erros de calibração da taxa de aplicação ficou na faixa de R$ 4.000,00 por ano por pulverizador. Entretanto, os fatores ligados a calibração geraram perdas maiores que R$ 10.000,00 por pulverizador por ano em alguns casos. Os problemas de manutenção também causam prejuízos, com grande freqüência de valores até R$ 4.000,00 por ano por pulverizador. De acordo com os resultados obtidos nas coletas de dados e nas simulações... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The aim of this study was to analyze errors on the sprayer calibration process and to quantify the economic impact of problems detected on periodic inspection of crop sprayers on the main soybean production regions in Brazil. This work was based on the IPP Project (Periodic Inspection of Sprayers) with focus on sprayers used on the States of Paraná (PR), Rio Grande do Sul (RS), Mato Grosso do Sul (MS) e Mato Grosso (MT). After the data collection process, some models were developed in order to analyze the calibration methods and the economic losses related to it. The results showed that all the sprayers presented failures, with emphasis on nozzle problems (82.4% on MT, 72.5% on PR, 62.5% on MS and 59.3% on RS). The frequency of errors on spray volume calibration were 70.6% on PR, 60.2% on RS, 37.5% on MS and 61,8% on MT. On the calibration process, the absolute mean errors on using the measuring cylinder range were 1.8% (RS) to 2.7% (PR), while the absolute mean errors for the calibration of the flow sensor range were 5.3% (RS) to 8,8% (MT). The higher frequency of economic losses related to the calibration process was within R$ 4,000.00 per year per sprayer. However, this value was found higher that R$ 10,000.00 per year per sprayer in some cases. Problems related to maintenance caused losses frequently up to R$ 4,000.00 per year per sprayer. Based on the data collected and the simulation using the models it was concluded that the calibration process based on the measuring cylinder present errors both related to the visual use of it the and the variability of nozzle flow along the boom. The calibration of the sprayers with electronic control showed errors above to those found on the measuring cylinder calibration process and this may be due to a chain of errors that should be further studied. As a general view the calibration process based on the measuring cylinder shower errors that... (Complete abstract click electronic access below)
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Siqueira, José Luiz de [UNESP]. « Inspeção periódica de pulverizadores : análise dos erros de calibração e impacto econômico ». Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/101944.

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Made available in DSpace on 2014-06-11T19:31:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-08-14Bitstream added on 2014-06-13T19:42:04Z : No. of bitstreams: 1 siqueira_jl_dr_botfca.pdf: 1502700 bytes, checksum: 1d3a462ce07320745538f36861327089 (MD5)
Os objetivos deste trabalho foram analisar os erros dos métodos usuais de calibração dos pulverizadores e quantificar o impacto econômico de problemas detectados na inspeção periódica de pulverizadores nas principais regiões produtoras de grãos no Brasil. A base do trabalho envolveu uma coleta de dados nos moldes do projeto IPP (Inspeção Periódica de Pulverizadores), englobando estudos dos equipamentos de pulverização de propriedades rurais nos Estados do Paraná (PR), Rio Grande do Sul (RS), Mato Grosso do Sul (MS) e Mato Grosso (MT). De posse da base de dados foram desenvolvidos modelos de simulação para avaliação dos métodos de calibração, estimativa de erros e dos prejuízos causados pelos mesmos. Os resultados mostraram que todas as máquinas apresentaram falhas de manutenção e calibração, com destaques para problemas no estado e conservação das pontas de pulverização. No MT 82,4% das pontas de pulverização encontravam-se inadequadas para o uso, seguido de PR com 72,5%, MS com 62,5% e RS 59,3%. Os erros na taxa de aplicação foram significativos, com valores de 70,6% para o PR, 60,2% para o RS, 37,5% para o MS e 61,8% para o MT. No que se refere ao método de calibração, o módulo dos erros médios de leitura do copo calibrador variaram de 1,8% (RS) a 2,7% (PR), enquanto o módulo dos erros médios de calibração do sensor de fluxo dos computadores variou de 5,3% (RS) a 8,8% (MT). A maior freqüência de prejuízos devido a erros de calibração da taxa de aplicação ficou na faixa de R$ 4.000,00 por ano por pulverizador. Entretanto, os fatores ligados a calibração geraram perdas maiores que R$ 10.000,00 por pulverizador por ano em alguns casos. Os problemas de manutenção também causam prejuízos, com grande freqüência de valores até R$ 4.000,00 por ano por pulverizador. De acordo com os resultados obtidos nas coletas de dados e nas simulações...
The aim of this study was to analyze errors on the sprayer calibration process and to quantify the economic impact of problems detected on periodic inspection of crop sprayers on the main soybean production regions in Brazil. This work was based on the IPP Project (Periodic Inspection of Sprayers) with focus on sprayers used on the States of Paraná (PR), Rio Grande do Sul (RS), Mato Grosso do Sul (MS) e Mato Grosso (MT). After the data collection process, some models were developed in order to analyze the calibration methods and the economic losses related to it. The results showed that all the sprayers presented failures, with emphasis on nozzle problems (82.4% on MT, 72.5% on PR, 62.5% on MS and 59.3% on RS). The frequency of errors on spray volume calibration were 70.6% on PR, 60.2% on RS, 37.5% on MS and 61,8% on MT. On the calibration process, the absolute mean errors on using the measuring cylinder range were 1.8% (RS) to 2.7% (PR), while the absolute mean errors for the calibration of the flow sensor range were 5.3% (RS) to 8,8% (MT). The higher frequency of economic losses related to the calibration process was within R$ 4,000.00 per year per sprayer. However, this value was found higher that R$ 10,000.00 per year per sprayer in some cases. Problems related to maintenance caused losses frequently up to R$ 4,000.00 per year per sprayer. Based on the data collected and the simulation using the models it was concluded that the calibration process based on the measuring cylinder present errors both related to the visual use of it the and the variability of nozzle flow along the boom. The calibration of the sprayers with electronic control showed errors above to those found on the measuring cylinder calibration process and this may be due to a chain of errors that should be further studied. As a general view the calibration process based on the measuring cylinder shower errors that... (Complete abstract click electronic access below)

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ANSELMI, ANDREA. « Un sistema di monitoraggio e di supporto alle decisioni per la gestione sostenibile dell'oliveto ». Doctoral thesis, Università Cattolica del Sacro Cuore, 2023. http://hdl.handle.net/10280/135601.

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L'obiettivo della mia ricerca è stato quello di sviluppare modelli previsionali delle principali parassiti dell’olivo. Sempre nel settore della difesa antiparassitaria di questa coltura, sono emerse inoltre pesanti criticità legate alla pratica applicazione dei trattamenti fitosanitari, oltre che per le grandi dimensioni delle piante e la difficile accessibilità che caratterizzano moltissimi oliveti, anche per la carente regolazione funzionale delle irroratrici e per il poco diffuso loro controllo strumentale. Pertanto è stato sviluppato anche un sistema di supporto alla taratura degli atomizzatori.
The objective of my research was to develop forecasting models of the main olive tree pests. Also in the area of pest control for this crop, serious criticalities emerged in connection with the practical application of phytosanitary treatments, not only due to the large size of the trees and the difficulties of accessibility that characterize many olive groves but also due to the poor functional regulation of sprayers and their little widespread instrumental control. Therefore, a system to support the calibration of sprayers was also developed.

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Lassauce, Aurélia. « Visualisation, granulométrie et évaporation de gouttes et de sprays - Etude dans une atmosphère close et pressurisée ». Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00667898.

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L'objectif de cette thèse consiste à déterminer l'influence d'une pression ambiante comprise entre 100 à 600 KPa sur l'évaporation d'une goutte, puis sur l'évaporation d'un spray soumis aux mêmes conditions. La première étape consiste à étudier l'influence de la pression ambiante sur l'évolution de la forme, du diamètre, de la vitesse et du débit d'évaporation d'une goutte de liquide en chute libre. Pour cela, une technique de mesure optique a été utilisée et une méthodologie a été développée pour calibrer cette technique de mesure et ainsi minimiser les erreurs de mesures sur la taille des particules. En parallèle, un modèle analytique d'évaporation de gouttes en chute libre a été développé : une attention particulière a été portée sur la détermination d'une corrélation adaptée au calcul du coefficient de traînée afin de tenir compte de l'évolution de la forme des gouttes au cours de leur chute. Ce modèle d'évaporation de gouttes est comparé à un modèle d'évaporation de spray (prenant en compte l'entrainement d'air, la concentration de vapeur au loin de la goutte et l'influence de la pression ambiante) pour montrer les limites du modèle d'évaporation de gouttes lors de son application à l'évaporation d'un spray. La deuxième étape de l'étude a consisté à appliquer les techniques de mesure et d'analyse mises au point précédemment à l'étude de la granulométrie d'un spray pour caractériser l'influence de trois paramètres : la pression ambiante, la pression d'injection du liquide et la nature du liquide. L'analyse des résultats a permis de développer un modèle statistique pour déterminer la granulométrie de ces sprays.

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Livres sur le sujet "Calibration of sprayers"

Division, Montana Environmental Management. Equipment pesticide training manual. Helena, Mont : State of Montana, Dept. of Agriculture, Environmental Management Division, 1986.

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Ontario. Ministry of Agriculture and Food. Field sprayer calibration. S.l : s.n, 1988.

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Landgren, Chal G. Calibrating and using backpack sprayers. [Corvallis, Or.] : Oregon State University Extension Service, 1996.

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Landgren, Chal G. Calibrating and using a backpack sprayer. [Pullman, Wash.] : Washington State University Extension Service, 1987.

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J, Smith Timothy. Orchard air-blast sprayer calibration, adjustment and operation. [Pullman] : Washington State University, Cooperative Extension, 1990.

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Chapitres de livres sur le sujet "Calibration of sprayers"

Fredericks, Steven A. « Diameter-Resolved Velocity Correction for Laser Diffraction Calibration and Wind Tunnel Measurement of Sprays ». Dans Pesticide Formulation and Delivery Systems : 40th Volume, Formulation, Application and Adjuvant Innovation, 46–61. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 2020. http://dx.doi.org/10.1520/stp162720190118.

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Catron, Philip. « Simple Hand Sprayer Calibration ». Dans HANDBOOK of Integrated Pest Management for Turf and Ornamentals, 163–64. CRC Press, 2020. http://dx.doi.org/10.1201/9780138752798-17.

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Actes de conférences sur le sujet "Calibration of sprayers"

Morishita, Don W., Stanley R. Gortsema, Jerry D. Neufled et Dale L. Bake. « Two year in-field sprayer calibration survey of sugar beet growers ». Dans American Society of Sugar Beet Technologist. ASSBT, 2007. http://dx.doi.org/10.5274/assbt.2007.10.

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Turunen, E., T. Varis, K. Ruusuvuori, T. E. Gustafsson, S. P. Hannula, M. Gasik et E. Antila. « Functionally Graded HVOF Sprayed NiCr-Al2O3 Coatings Coatings for Demanding Applications ». Dans ITSC2003, sous la direction de Basil R. Marple et Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1531.

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Abstract Functionally graded (FG) coatings were manufactured by High Velocity Oxy-Fuel (HVOF) thermal spraying and tested aiming for the high temperature applications. Single layers were manufactured and their elastic modulus measured by using Impulse Excitation Technique (IET). Obtained data was used for modeling of optimal gradient structure. Dual feeding hose for HVOF gun was developed. Calibration procedure for the concurrent use of two powder feeders was performed. NiCr-Al2O3 coatings with coating thickness of 600 µm and 1000 µm were manufactured and tested. Promising results were obtained from high temperature corrosion tests.

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Hollis, Kendall J., Deborah A. Summa, Velma M. Lopez et George J. Havrilla. « Spatial Mapping of Plasma Sprayed Coating Thickness Using X-Ray Fluorescence ». Dans ITSC2015, sous la direction de A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen et C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0654.

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Abstract The measurement of the spatial distribution of coating thickness of thin coatings applied by thermal spraying can be challenging. For non-magnetic metallic substrates and coatings, X-Ray Fluorescence (XRF) was employed for measuring coating thicknesses in the range of 15 to 60 μm. XRF is used to measure the ratio of atomic fluorescence peaks for an element in the substrate to an element in the coating. With appropriate calibration, the ratio of peak intensities gives the coating thickness for the spot sampled. Mass gain and cross sectional metallography are compared to XRF to determine accuracies and sensitivities of the techniques for plasma sprayed coatings.

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Pascuzzi, Simone, et Fabrizio Mazzetto. « Feasibility study of using laser technology for calibrating orchard sprayer machinery. First results ». Dans 2021 IEEE International Workshop on Metrology for Agriculture and Forestry (MetroAgriFor). IEEE, 2021. http://dx.doi.org/10.1109/metroagrifor52389.2021.9628610.

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Escribano, M., R. Gadow et M. Buchmann. « Residual Stress Analysis in Thermally Sprayed Layer Composites, Using the Microhole Milling and Drilling Method ». Dans ITSC2003, sous la direction de Basil R. Marple et Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1297.

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Abstract Mechanical and tribological properties of layer composites like hardness, bonding strength, friction and wear coefficients as well as operation performance, component reliability and finally the system lifetime are mainly influenced by residual stresses after the thermal spraying and machining process. The residual stress situation in thermally spray coated composites is superimposed by different stress mechanisms occurring during the manufacturing process based on heat and mass transfer during the coating deposition. Using the microhole milling and drilling method, residual stress fields can be measured in a quasi non destructive way over the drilling depth with appropriate resolution. In several drilling and micromilling operations a circular, cylindrically shaped microhole is brought step by step into the component surface. The residual stresses are locally relieved due to material removal, deform the surface around the drilled microhole and are measured by high resolution measurement tools, e.g. strain gauges (DMS), for every drilling step in form of relaxed surface strains. Using calibration curves and material data (E, μ) the measured surface strains are converted into nominal strains at the bottom of the drilled hole for every drilling step. Out of the differentiated strains, in-plane stress fields can be incrementally determined by Hooke's law. This study describes residual stress measurement features, the FEM-calculation and idealization of calibration curves as well as results of exemplary stress measurements.

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Viens, M., D. Drolet, A. Blouin, J. P. Monchalin et C. Moreau. « Nondestructive Characterization of Plasma Sprayed Coatings by Laser Ultrasonics ». Dans ITSC 1996, sous la direction de C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0947.

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Abstract Nondestructive methods previously developed for the detection of flaws, such as delaminations, or for the evaluation of the elastic properties of materials, could be judiciously adapted in order to get a better assessment of plasma-sprayed coatings. Laser ultrasonics is a nondestructive evaluation method which relies on both optics and ultrasonics. A short-pulse laser generates an ultrasonic wave into the material to be inspected, and a long-pulse laser, coupled to an interferometer, detects the resulting ultrasonic displacement. Laser ultrasonics is a remote sensing method and therefore could be used for the monitoring of hot plasma-sprayed coatings during the deposition process. In this work, experiments were performed on samples composed of ZrO2 sprayed under different conditions onto thick copper substrates. The samples were first probed by conventional ultrasonic transducers and then by a non contact laser-ultrasonic scanning system. The two series of measurements agreed well. These experiments showed that, after calibration, the coating thickness could be measured during the deposition process, with a relatively good accuracy, by laser ultrasonics. The laser-ultrasonic scanning system also revealed non uniformity of more than 10% in the coating thickness of the tested samples. This thickness variation is possibly caused by a temperature gradient induced in the coatings during spraying.

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Friis, M., et P. Nylén. « A Numerical Study of the Sources of Variation in In-Flight Particle Characteristics in Atmospheric Plasma Spraying ». Dans ITSC2003, sous la direction de Basil R. Marple et Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1149.

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Abstract The resulting thermal and mechanical properties of atmospheric plasma sprayed coatings, are strongly dependent on the particle in-flight characteristics, which in turn depend on the spray gun variables. In industrial production the spray gun variables are set to constant values and closed loop controlled. However, calibrations of the variable levels are regularly performed and variations within specified tolerance limits allowed, which cause variations in the particle in-flight characteristics. The objective of this work was to investigate how these calibration variations affect the particle in-flight characteristics and the final coating properties. The investigation was performed using three-dimensional computational fluid dynamics simulations. The process model correspond to the SM-F-100 Connex gun, spraying ZrO2 for thermal barrier coating applications. Particle in-flight characteristics were calculated using a stochastic discrete particle model. Validation of the model was performed using the optical DPV2000 system, and fair agreement was found. Voltage, arc current, primary, secondary and carrier gas flow rates were systematically varied one factor at a time and their separate effects on the particle in-flight characteristics evaluated. The most important variables influencing the particle characteristics were current and voltage. Final simulations considering extreme cases enabled determination of the particle characteristics limiting conditions due to tolerance variations. Coating microstructure evaluations of two of these extreme cases revealed that the total porosity could vary up to 4% due to tolerance variations.

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Fimml, Wolfgang, Christian Fuchs, Thomas Jauk et Andreas Wimmer. « Optical Analysis and Simulation of Diesel Sprays in a High Pressure and High Temperature Spray Box ». Dans ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1376.

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The characterization of diesel sprays for the simulation-based optimization of injection strategies and combustion chamber geometries is of particular importance to reach future targets concerning performance, fuel consumption and emissions. The prediction quality of this simulation process depends largely upon the adequate calibration of the spray models used. This paper aims to present the experimental setup of a spray box, the applied optical visualization techniques and the results. Furthermore, it will show the adjustment and the validation of the simulation models based on the experimental analysis.

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Kumar, R., P. Cheang, K. A. Khor et T. White. « XRD and Rietveld Quantitative Phase Analysis of Radio Frequency Suspension Plasma Sprayed Nano-hydroxyapatite Powders ». Dans ITSC2001, sous la direction de Christopher C. Berndt, Khiam A. Khor et Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0093.

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Abstract Ultra-fine hydroxyapatite powders were successfully synthesized using radio frequency (RF) suspension plasma spraying (SPS). This novel technique utilises the inherent characteristics of the RF plasma to axially feed and spheroidise a liquid suspension to produce spherical ultra-fine HA powders. This offers an alternative approach over conventional D.C. and flame spheroidising techniques which are better suited for solid feed stocks. Rietveld analysis was subsequently applied using Rietquan Quantitative Analysis software package to determine the amount of decomposed phases and amorphous content of the as-sprayed powder. This was also compared against quantitative XRD analysis employing internal and external standards. However, pure phases needed for calibration is scarce and amorphous calcium phosphate (ACP) is virtually impossible to isolate. In addition, the long and laborious task of obtaining calibration curves makes this technique unpopular. Nevertheless, conventional quantitative phase analysis (QPA) was carried out, using relative peak height ratios of HA and the phase involved, but the calculated decomposition only shows relative trends for a particular parameter variation. Determining the actual phase content is critical because of possible variations in biological responses when used as coatings and inserts in restorative orthopaedic implants. Varying tissue responses can arise from decomposed phases such as α and β-tricalcium phosphate (TCP) and tetra-calcium phosphate (TTCP) as well as ACP which generally have higher solubility as compared to crystalline. QPA via the Rietveld method provides a powerful tool that offers the user simultaneous quantitative phase determination of multiphase systems containing amorphous content. Unlike XRD QPA, the amorphous content could be indirectly calculated using crystalline alumina standard. XRD QPA results showed that decomposition generally rose with plate power without considering the amorphous content. With Rietveld QPA, the results showed an initial rise in decomposition before decreasing at higher plate powers. The amorphous phase content was calculated at different plate powers and concentration of suspension with the aid of alumina as an external standard. Results showed that the amorphous content increased substantially at higher powers. This study demonstrates the ability of Rietveld analysis to completely quantify all associated amorphous and crystalline phases within a multiphase system for any thermally treated material.

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Sauer, J. P. « The Use of Metallographic Standards in Calibration of the Polishing Process ». Dans ITSC 1997, sous la direction de C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0955.

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Abstract The metallographic process for evaluating thermally sprayed coatings is sometimes viewed as a variable process in the scope of coating evaluation. There is always a question as to whether the failure of a coating is polishing related or an actual change in the spray production process. The use of metallographic standards similar to hardness calibration can be implemented to provide assurance of a repeatable metallographic polishing. Development and use of the standards will be discussed and examples given of the standards principle.

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