트랙터 장착형 일관작업 둥근두둑 복합기의 슬립특성 분석
Slip Analysis of an Integrated Tractor Implement for Round Ridge Preparation
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초록
밭농업의 기계작업을 복합기로 일관화하기 위하여 관행의 개별적 기계를 모듈화하고 일체화시켜 둥근두둑 작물의 재배체계에 맞추어 구성하였다. 본 연구의 목적은 둥근두둑 복합작업기의 작업성능을 파악하는데 근거가 되는 슬립의 특성을 분석하여 집약농업의 작업효율을 극대화 할 수 있는복합작업기의 운용방안을 제시하고자 하였다. 도플러 레이더 속도계를 사용하여 무부하 기준속도를 콘크리트 지면에서 주행속도를 측정하고, 후륜동반경을 결정함으로써 이론 회전속도를 이용하여 제로슬립 속도를 계산하였다. 연구의 결과는 변수의 유의한 영향에도 불구하고 심하게 낮은슬립의 범위(3.9-8.9%)에 있음을 보였다. 이는 복합작업기의 무거운 중량에 대응한 정적 후방전도 안정성을 위하여 카테고리 2급 트랙터를 사용하였기 때문이다. 로타베이터를 기본으로 하는 집약농업의 경우 작업속도(2.0-4.0km/h)가 저속이므로‘gear up throttle down’원리가 적용되지 않으며연료의 소비량은 운용비용에 절대적이지 않을 것으로 판단된다. 따라서 복합기의 운용은 견인 및 연료효율에 맞춰져서는 큰 이득이 예상되지않으며, 파종상토와 멀칭작업의 품질, 즉 작업결과에 초점이 맞춰져야 한다.
Abstract
To sequence the conventional practice of upland farming, individual machines were modularized and combined into an integrated tractor implement which was fabricated along the cropping system for round ridge. The objectives of this study are to analyze slip characteristics, underlying field performance of an integrated implement for round ridge crops and then to suggest management of the implement to maximize operating efficiency in the intensive agriculture. A Doppler radar speedometer was used to measure no-load speed on concrete track and slip was calculated by determining the dynamic radius of rear wheels using the zero slip speed. The results of the study showed low slips (3.9-8.9%) despite the significant effects of the experimental variables because the weight of the integrated implement attached to a Category II tractor was excessively heavy to ensure static rearward stability. For the intensive farming which mainly uses rotavator, the principle of ‘gear up throttle down’ wouldn't be applied and neither saving of fuel consumption be influential to operating costs because of the low operating speed (2.0-4.0 km/h). Therefore, operation of the integrated implement wouldn't get predominant beneficial by draft and fuel efficiencies but should be focused on the quality of outcomes, such as seedling bed and mulching.
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