• Journal of Biosystems Engineering
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• 제20권4호
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• pp.313-322
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• 1995

This study was conducted to find the design factors of spraying device of the boom sprayer for low volume application. Specific objectives of this study were 1) to select proper nozzles for broadcast spraying and row crop spraying by the nozzle spray characterisic experiment, and 2) to investigate the coverage characteristic of rice plant at the row crop spraying. The results of this study are summarized as follows. (1) From the tested results on the droplet diameter spectrum and spray pattern the standard flat-fan nozzle and drift guard nozzle were judged as appropriate for the broadcasting. Even flat-fan nozzle showed similar span values to standard flat-fan nozzles and drift guard nozzle : however, the nozzles were found to be inappropriate for broadcasting because of their spray pattern. Hollow cone nozzle showed relatively small span values and uniform spray pattern. (2) For the upper and lower sides of the rice plants, coverage rates of even flat-fan nozzles and hollow cone nozzles were maximum at the second row, but decreased rapidly after the third row. For the middle side of the rice plants, coverage rates of them were maximum at the first row, but decreased rapidly. When one nozzle was tested, C.V. values were in the range of 90~160% and 60~160% on entire heights of rice plant for even flat-fan nozzles and hollow cone nozzles respectively. C.V. values at other parts were poor. Spray coverage rate at the middle part was improved by overlapping the nozzles whereas there was little difference on the upper and lower part of rice plants. (3) For spraying lower part of rice plant between rows, even flat-fan nozzles and hollow cone nozzle were judged as appropriate, but in order to ensure the uniform coverage, distance between nozzles, recommended to be less than 90cm.

• Journal of Biosystems Engineering
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• 제20권3호
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• pp.217-225
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• 1995

This study was conducted to find design factors of spraying device of the boom sprayer for low volume application. Four types of nozzles(standard flat nozzle, drift guard nozzle, even flat nozzle, and hollow cone nozzle) were used for the spray characteristic experiment. Spray patterns of the nozzles were distinguished by the nozzle type, spray distance, and spray direction. The flow rate was proportional to the square root of spray pressure in all nozzles. Increased nozzle height improved spray distribution at reduced pressures and/or increased spacing. Distribution tended to improve as pressure increased within the range of pressures used for fan nozzles.

• 한국산학기술학회논문지
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• 제17권1호
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• pp.597-604
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• 2016

본 논문에서는 항공 방제 시 균일 방제를 통하여 병해충에 의한 농산물 생산량 저하 및 농약이 과도 살포된 농작물 생산을 방지하고자 하였다. 항공 방제가 실시되는 비행 고도 3m와 속도 15km/h를 유지하는 것은 사용자의 조종 습관 및 방법, 바람의 변화 같은 환경적 요인이 작용하여 대단히 어렵다. 따라서 무인 헬리콥터로부터 비행 데이터를 전송받아 비행속도 및 고도의 변화에 따라 붐의 각도와 DC 펌프의 제어가 가능하도록 살포 장치 및 제어기를 설계 및 제작하였고 무성항공사의 무인 헬리콥터 Rmax에 탑재하여 살포 성능을 검증했다. 실험은 가로 10m, 세로 50m의 농지에서 감수지를 한 열에 1.25m 간격으로 9장씩 5열을 5m의 위치에서부터 10m 간격으로 배치하고, 방제 실험 시 제작된 항공 살포 시스템을 이용하여 살포하였다. 무인 헬리콥터는 최저속도 7.2km/h부터 최고속도 17.6km/h, 최저높이 2.32m부터 최고 3.47m까지 최고 10.4km/h의 속도 변화와 1.15m 고도 변화를 보이며 비행하였고, 각 열이 평균 46423개의 입자개수의 분포로 7.5m의 유효 살포 영역을 형성함을 보여 제안된 항공 살포시스템이 균일 방제에 효과가 있음을 증명한다.