Search Result of "Robogate"

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ผลงานตีพิมพ์ในวารสารวิชาการ

Development of a Canal Automation Model: A Laboratory Experiment

ผู้แต่ง:ImgDr.Varawoot Vudhivanich, Associate Professor, ImgWich Sriwongsa,

วารสาร:

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ผลงานตีพิมพ์ในวารสารวิชาการ

Field Performance of Kamphaengsaen Canal Automation System

ผู้แต่ง:ImgDr.Varawoot Vudhivanich, Associate Professor, ImgVich Sriwongsa,

วารสาร:

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Development of a Canal Automation Model: A Laboratory Experiment)

ผู้เขียน:Imgดร.วราวุธ วุฒิวณิชย์, รองศาสตราจารย์, ImgWich Sriwongsa

สื่อสิ่งพิมพ์:pdf

Abstract

The main objective of the project was to study and develop a canal automation model using local material and equipment. The canal automation model was developed at the Department of Irrigation Engineering, Faculty of Engineering, Kasetsart University, Kamphaengsaen campus. The model consisted of 4 gate controllers (Robogates) installed in the canal model for upstream water level control and 1 Robogate installed at the head tank to control the discharge into the canal model. Each Robogate controller is an embedded system designed to monitor the water level, gate positioning and to control the regulator. A Robogate is designed to work in 3 modes: Mode 0 (telemetering mode), Mode 1 (automatic mode) and Mode 2 (remote control). An upstream control algorithm was used for self-regulating the check gate in automatic mode. The performance of the canal automation model and the Robogates was tested in 6 runs. The farm turnout (FTO) gate was adjusted randomly to create disturbance to the flow in the canal model. The results showed that generally, the Robogate was very capable at controlling the water level in the model. The coefficient of variation of the water level upstream of the Robogate was very small, being less than 0.06 in all experiments. Two indicators–namely the maximum control error and the unsteady period, were selected for the analysis of the performance of the canal automation model under disturbed conditions. The percent maximum error of water level from the target was smaller for the most upstream Robogate compared to the downstream Robogates. The maximum error increased from upstream to downstream. The average maximum errors were 6.6, 9.4, 20.5 and 29.2% for Robogates 1, 2, 3 and 4, respectively. Although the maximum error was rather high, particularly for the downstream Robogates, this was only for a short time during the model testing. The average percentages of maximum error in controlling the water level between the 4 Robogates were significantly (P < 0.05) different. This result confirmed one of the disadvantages of the upstream control algorithm. The deviation from target, either in terms of water excess or water shortage, will usually be passed to the downstream reach of the canal or any flow disturbance will be passed to the downstream canal reach. The unsteady period ranged between 2 and 8 min and was 6 min on average. The analysis of variance of the unsteady time due to the adjustment of the FTO gate showed that the average time period for each Robogate to stabilize the water level back to the target level was not significantly (P > 0.05) different. This laboratory experiment showed that the Robogates could remove the effect of flow disturbances within a reasonable period of 2–8 min. This experiment helped in determining that the Robogates can be used for the effective and automatic control of the upstream water level.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 045, Issue 2, Mar 11 - Apr 11, Page 353 - 365 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Field Performance of Kamphaengsaen Canal Automation System)

ผู้เขียน:Imgดร.วราวุธ วุฒิวณิชย์, รองศาสตราจารย์, Imgวิชญ์ ศรีวงษา

สื่อสิ่งพิมพ์:pdf

Abstract

The Kamphaengsaen canal automation system (KPS CAS) was developed for real time monitoring and regulation of the flow in the canal irrigation system of Kasetsart University, Kamphaengsaen campus, Nakhon Pathom province. KPS CAS consists of five remote terminal units (RTUs) and a master station. Robogate, a low cost micro-controller embedded system was used to function as RTUs for flow monitoring and control in the irrigation canals of Kamphaengsaen campus. Two types of Robogate were used—namely, a water level control Robogate installed at a cross regulator and a discharge control Robogate installed at a head regulator. Upstream water level control and constant volume control were algorithms of KPS CAS that were used for the water level and discharge control, respectively. The master station installed at the Department of Irrigation Engineering located more than 1 km from the Kamphaengsaen canal irrigation system was designed to poll the data from the RTUs every half an hour via citizen band 245 MHz radio. The KPS CAS was tested for 600 d during the period from 10 October 2006 to 1 June 2008. The various field performances of the canal automation system were studied including the accuracy of the floating-type water level and gate positioning sensors, performance characteristics of the upstream water level control algorithm, reliability of data measurement and the overall control performance of the KPS CAS. The results showed that both sensors had a very small error of measurement. The characteristics of water level and gate adjustment of Robogate 9021 were observed at 5 sec intervals, producing more than 20,200 data records, in order to check the effectiveness of the upstream control algorithm. When the upstream water level deviated from the target water level, the gate was adjusted 4–12 times automatically, within a duration of 310–780 sec, until the upstream water level was maintained at the target level. During the test period of 600 d, 17.3% of data were missing due to unexpected disturbances and failures. The automatic mode operation was compared to the manual operation. The root mean square error of the target water level control in the automatic mode (0.009–0.013 m), was considerably smaller than that of the manual mode (0.118–0.178 m). With smaller water level fluctuations at the cross regulators, the head regulator could produce a more uniform discharge into the canal. Therefore it could be concluded that the KPS CAS is useful for flow control.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 045, Issue 5, Sep 11 - Oct 11, Page 943 - 959 |  PDF |  Page 

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Researcher

ดร. วราวุธ วุฒิวณิชย์, รองศาสตราจารย์

ที่ทำงาน:ภาควิชาวิศวกรรมชลประทาน คณะวิศวกรรมศาสตร์ กำแพงแสน

สาขาที่สนใจ:อุทกวิทยา, การจัดการน้ำ

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