[논문]농용 트랙터용 접촉식 지상고 측정 센서 개발

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doi:10.5307/jbe.2008.33.1.007

농용 트랙터용 접촉식 지상고 측정 센서 개발
Development of a Contact Type Height Sensor to Measure Ground Clearance of an Agricultural Tractor 원문보기

The tillage depth control system is one of the most salient control system of tractor implements. A contact-type height sensor was developed to measure ground clearance for the tillage depth control. The height sensor was fabricated in this study, and its efficacy in a tillage depth control system was evaluated. Experiments were conducted in order to determine both static and dynamic detection characteristics of the height sensor using soil bin system on the sampled soil (sandy loam, sand, clay loam). The results of the static detection characteristics showed that in the case, sandy loam soil despite and clay loam soil at a wet basis moisture content of 30%, large measurement errors were observed a due to penetration of a plastic puck into the sampled soil. The results of the dynamic detection characteristics showed that the height sensor detected the distance from the ground of sandy loam soil despite the uneven nature of the ground surface and the changes in traveling speed $1km/h{\sim}5km/h$ at a wet basis moisture content of 10%.

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가설 설정

(1) The static detection characteristics of the height sensor were unaffected by vertical positioning and soil type. However, in the case of the soils B (SL) and D (CL), substantial measurement errors were observed, due to the penetration of the plastic puck into the sampled soil, under conditions in which the soils reached a state of saturation at a wet basis moisture content of 30%.

제안 방법

Both experiments were conducted at five traveling speeds, 1 km/h, 2 km/h, 3 km/h, 4 km/h, and 5 km/h. During these experiments, all output signals from the height sensor were recorded on an analog data recorder.
In this study, a contact-type height sensor for the agricultural tractor on soil was designed and fabricated, and indoor experiments were conducted under various conditions to assess the detection ability of the height sensor. The various characteristics tested and included: distance from the ground surfece, soil type, moisture content (wet basis), ground surface configuration, and carrier traveling speed.
2 depicts the experimental apparatus. It is comprised of a soil bin, a carrier, an AC motor (Model: 261PA, Mabuchi Co. Ltd., Japan) for moving the carrier, and a small soil bin for constructing the configuration of the ground surface. The soil bin is equipped with rails and pulleys, which are attached at both ends, and move the carrier.
8. It shows the experimental results for the sine wave configurations of the ground surfece at a carrier travel speeds; 1 km/h, 2 km/h, 3 km/h, 4 km/h, and 5 km/h. The vertical positioning was detected by the height sensor despite the uneven nature of the ground surfeces, as well as the changes in traveling speed.
Static experiments were conducted in order to determine the effects of factors including soil type, moisture content (wet basis), and distance, according to the detection characteristics of the height sensor.
The experiments were conducted at different vertical positions of the height sensor from the ground surface: 40 mm, 90 mm, 140 mm, and 190 mm, and different wet basis moisture contents: 0%, 10%, 20% and 30%, for soil samples A (SL), B (SL), C (S), and D (CL) of USDA Classification. The output voltage of the height sensor was measured under the above conditions.
In this study, a contact-type height sensor for the agricultural tractor on soil was designed and fabricated, and indoor experiments were conducted under various conditions to assess the detection ability of the height sensor. The various characteristics tested and included: distance from the ground surfece, soil type, moisture content (wet basis), ground surface configuration, and carrier traveling speed. The results can be summarized as follows;
(1996, 1998, 2000) conducted a study concerning the use of a tillage depth control system for rotary implements. They detected the lift arm angle, pitching, and ground clearance characteristics based on the readings of non-contact optical and ultrasonic sensors. Recently, investigators in Korea and Japan attempted to employ the swing angle of the leveling plate hinged on the cover of the rotary implements as a feedback signal for the developed tillage depth control system.
Soil sample B (wet basis moisture contents: 10%) was typically used for the experiments. Two types of configurations of the ground surface, step and sine waves, were constructed in the small soil bin, the dimensions of which were 3,000 mm in length, 300 mm in width, and 260 mm in height.

대상 데이터

3. For these experiments, the height sensor was moved 180 mm, 140 mm, 110 mm, and 60 mm from each step of the ground surface.
Four types of soil samples were employed in the experiments. The composition, classification and condition of the soils are shown in Table 1.
The height sensor is comprised of two primary units; a driving unit and a controller, as shown in Fig. 1. The dimensions are 350x100x100 mm (height x length x width).

성능/효과

(2) The results of the dynamic detection characteristics showed that the height sensor detected the distance from the ground of soil B (SL) despite the uneven nature of the ground surface and the changes in traveling speed 1 km/h 〜5 km/h at a wet basis moisture content of 10%.

후속연구

(3) The experimental results indicated the potential for the application of the height sensor as a ground clearance detector in a tillage depth control system. The problem detected in the loam-type soils under saturation conditions and the compensation method for static experiments according to the moisture contents should be considered in future investigations.

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연합인증

농용 트랙터용 접촉식 지상고 측정 센서 개발
Development of a Contact Type Height Sensor to Measure Ground Clearance of an Agricultural Tractor 원문보기

Abstract ▼ AI-Helper

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가설 설정

제안 방법

대상 데이터

성능/효과

후속연구

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연합인증

농용 트랙터용 접촉식 지상고 측정 센서 개발 Development of a Contact Type Height Sensor to Measure Ground Clearance of an Agricultural Tractor 원문보기

Abstract ▼ AI-Helper

주제어

AI 본문요약 엑셀 다운로드 AI-Helper

가설 설정

제안 방법

대상 데이터

성능/효과

후속연구

참고문헌 (5)

이 논문을 인용한 문헌

저자의 다른 논문 :

이충호 (18)

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선택된 텍스트

농용 트랙터용 접촉식 지상고 측정 센서 개발
Development of a Contact Type Height Sensor to Measure Ground Clearance of an Agricultural Tractor 원문보기

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