Uniformity microsprinkler irrigation system using statistical quality control

Andrade, Maurício Guy de; Boas, Márcio Antônio Vilas; Siqueira, Jair Antônio Cruz; Sato, Mireille; Dieter, Jonathan; Hermes, Eliane; Mercante, Erivelto

doi:10.1590/0103-8478cr20160546

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…Silva et al (2015) by studying the process capability index in saline water self-compensating emitters and also obtained Cpk > Cp. The results also corroborate with Andrade et al (2017) who observed an increase in the process capacity index directly proportional to the mean values of UC and UD.…”

Section: Discussionsupporting

confidence: 90%

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Lopes¹,

Boas²,

Pazuch³

et al. 2019

JAS

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The topography directly influences the functioning of an irrigation system, being necessary the determination of the uniformity to verify its performance. Statistical quality control is a powerful tool for verifying the quality of a process. Thus, it was aimed to use the statistical control of quality in the evaluation of the uniformity of a drip irrigation system in different slopes. The Christiansen’s uniformity coefficient (UC) and Uniformity of Distribution (UD) were determined and analyzed by the control graphs of Shewhart, Zones and CUSUM and by the indices of process capacity (Cp, Cpl and Cpk), in different slopes (0%, 2% and -2%). The slope irrigation was more uniform (UC = 99.03% and UD = 98.45%), however, for all the graphs studied it was out of statistical control. Zone charts were more sensitive than the CUSUM and Shewhart charts.

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Section: Discussionsupporting

confidence: 90%

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Lopes¹,

Boas²,

Pazuch³

et al. 2019

JAS

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“…It was observed that the hydraulic head classified as regular in terms of uniformity (10 and 11 kPa), presented points outside the control limits, indicating points outside of the statistical control process, whereas the 12 and 15 kPa hydraulic heads, whose uniformity was classified as good, were under statistical control, with no trend or no point was outside the control limits. In the study by Andrade et al (2017b), although most processes were simple, they were classified as controlled by the Shewhart control chart and considered significant for the evaluation of irrigation. The 10 kPa hydraulic head presented an isolated point outside the control lines, which can be caused by factors such as low pressure (Saraiva et al, 2014), clogging of drippers, energy fluctuations, pressure variations, and climatic factors (Justi and Saizaki, 2016).…”

Section: Resultsmentioning

confidence: 99%

Control charts for monitoring drip irrigation with different hydraulic heads

Lopes¹,

Boas²,

Pazuch³

et al. 2020

Rev. ambiente água

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This study monitored a drip irrigation system with different hydraulic heads, using control charts. The study included 25 tests, and was conducted at the Experimental Nucleus of Agricultural Engineering of the State University of Western Paraná, located in the municipality of Cascavel, Paraná. The drip irrigation system was operated by gravity, and had four hydraulic heads (10, 11, 12 and 15 kPa). The uniformity of the system was determined based on uniformity distribution. Uniformity monitoring was performed using Shewhart and exponentially weighted moving-average (EWMA) control charts. An increase in the hydraulic head increased uniformity. The use of 12 and 15 kPa hydraulic heads yielded good performance, whereas 10 and 11 kPa yielded regular performance. The use of control charts proved to be efficient; the Shewhart control chart was more robust, whereas the EWMA control chart, which indicated trends and deviations not shown by Shewhart control charts, was more sensitive.

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“…A uniformidade é influenciada pelas diferenças de pressão, desgaste do sistema e entupimento, principalmente quando utilizados fertilizantes. Fatores como o espaçamento entre os emissores/aspersores e fatores externos, como o clima e a topografia, além das variações de fabricação também afetam a uniformidade (ANDRADE et al, 2017).…”

Section: Fundamentação Teóricaunclassified

Simulação Matemática Do Comportamento Hidráulico De Microaspersores Ao Longo Da Linha Lateral

Polycarpo¹,

Silva²,

Coutinho³

et al. 2019

Democratização Do Conhecimento E Valorização Profissional: Caminhos Para Desenvolvimento Tecnológico E Social.

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Resumo A água é um recurso natural imprescindível para a manutenção e desenvolvimento da humanidade. Atualmente há uma preocupação demasiada com a quantidade de água requerida para a irrigação, o qual pode ser justificada pelo decréscimo de sua disponibilidade tanto quantitativamente como qualitativamente, atenuando o interesse pela racionalização desse recurso. A prática da irrigação localizada comparada aos demais sistemas de irrigação, vem crescendo destacadamente no cenário mundial mostrando-se um mercado promissor, e tem particularmente na região semiárida uma maior aplicação devido ao seu uso proporcionar uniformidade e eficiência, além de minimizar os riscos de salinização. Objetivou-se com este estudo avaliar o comportamento hidráulico do gradiente de pressão e do comprimento ao longo da linha lateral de dois emissores tipo microaspersor, utilizando o modelo de Wu e Gitlin. O dimensionamento do projeto foi feito a partir de simulações matemáticas para dois microaspersores (bocal Rosa e Gelo). Para simulação do perfil de pressão ao longo da linha lateral, adotou o modelo de dimensionamento proposto por Wu e Gitlin, em que, foi calculada a descarga do emissor, a descarga total da linha lateral composta por 10 microaspersores, a viscosidade cinemática da água, a perda de carga, o fator de correção, a perda de carga no trecho e a perda de carga unitária. Sendo, então, obtido o diâmetro da linha lateral, o comprimento da linha lateral e a declividade. O microaspersor Rosa apresentou uma variação instável a laminar e do bocal Gelo um regime turbulento a totalmente turbulento. Conclui-se que o modelo aplicado foi eficaz no dimensionamento do gradiente de pressão ao longo da

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Uniformity microsprinkler irrigation system using statistical quality control

Cited by 8 publications

References 9 publications

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Control charts for monitoring drip irrigation with different hydraulic heads

Simulação Matemática Do Comportamento Hidráulico De Microaspersores Ao Longo Da Linha Lateral

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