• Title/Summary/Keyword: agricultural machine

Search Result 657, Processing Time 0.023 seconds

Study on Traveling Characteristics of Straight Automatic Steering Devices for Drivable Agricultural Machinery (승용형 농기계용 직진 자동조향장치 주행특성 연구)

  • Won, Jin-ho;Jeon, Jintack;Hong, Youngki;Yang, Changju;Kim, Kyoung-chul;Kwon, Kyung-do;Kim, Gookhwan
    • Journal of Drive and Control
    • /
    • v.19 no.4
    • /
    • pp.19-28
    • /
    • 2022

  • This paper introduces an automatic steering system for straight traveling capable of being mounted on drivable agricultural machinery which user can handle it such as a tractor, a transplant, etc. The modular automatic steering device proposed in the paper is composed of RTK GNSS, IMU, HMI, hydraulic valve, and wheel sensor. The path generation method of the automatic steering system is obtained from two location information(latitude and longitude on each point) measured by GNSS in advance. From HMI, a straight path(AB line) can be created by connecting latitude and longitude on each point and the device makes the machine able to follow the path. During traveling along the reference path, it acquires the real time position data every sample time(0.1s), compares the reference with them and calculates the lateral deviation. The values of deviation are used to control the steering angle of the machine using hydraulic valve mounted on the axle of front wheel. In this paper, Pure Pursuit algorithm is applied used in autonomous vehicles frequently. For the analysis of traveling characteristics, field tests were executed about these conditions: velocity of 2, 3, 4km/h which is applied to general agricultural work and ground surface of solid(asphalt) and weak condition(soil) such as farmland. In the case of weak ground state, two experiments were executed about no-load(without work) and load(with work such as plowing). The maximum average deviations were presented 2.44cm, 7.32cm, and 11.34cm during traveling on three ground conditions : asphalt, soil without load and with load(plowing).

  • https://doi.org/10.7839/ksfc.2022.19.4.019 인용 PDF KSCI

Measurement of Physical Properties of Korean Garlic for Grade Standard

  • Hong, J.H.;Koh, H.K.
    • Agricultural and Biosystems Engineering
    • /
    • v.3 no.1
    • /
    • pp.1-9
    • /
    • 2002

  • Garlic is one of the major seasoning vegetables in Korea and consumed mostly in a form of peeled cloves. Conventional Korean standards for garlic grading consist of four classes according to the size of bulb and its shape. Sorting and grading of garlic are manually done but could be in the process of automated mechanization using machine vision system in the near future. The proportion of mass of cloves in a garlic bulb to the volume of the bulb (g/ml) was determined to find out the best way of representing both the quantity and quality of cloves in each bulb. Garlic bulb was assumed as an ellipsoid and its major and minor axis and its height were measured to calculate its volume. The mass proportions and density of a garlic bulb and cloves were measured for four domestic varieties of garlic to propose it as a standard for Korean garlic grading machine.

  • PDF

Studies on the Development of a Tea Harvesting Machine

  • Okada, Yoshiichi;Gejima, Yshiinori
    • Proceedings of the Korean Society for Agricultural Machinery Conference
    • /
    • 1996.06c
    • /
    • pp.478-487
    • /
    • 1996

  • A " plucking rolls device" was developed in this study to improve the quality of harvested tea leaves. In this report, the outline of the system and the results of performance experiments in our laboratory are discussed. Tow kinds of performance experiments were carried out. The first experiment checked harvesting accuracy by using a plucking unit that was developed for harvesting machine installation. The second experiment was a harvesting experiment which utilized a fron bar in order to prevent cutting of the tea buds which had been a problem in precious experiments . As a results of the first experiments , it was confirmed that selective harvesting obtained high quality tea leaves. but a cutting problem that, when the harvesting seed was faster than the working speed, which was non-selective harvesting , was also seen. In the second experiment, the cutting rate decreased to a maximum of 50% level, when tea buds most bent ahead by the front bar. The effect was seen that cutt ng problem was alleviated from this.

  • PDF

Forecasting Demand of Agricultural Tractor, Riding Type Rice Transplanter and Combine Harvester by using an ARIMA Model

  • Kim, Byounggap;Shin, Seung-Yeoub;Kim, Yu Yong;Yum, Sunghyun;Kim, Jinoh
    • Journal of Biosystems Engineering
    • /
    • v.38 no.1
    • /
    • pp.9-17
    • /
    • 2013

  • Purpose: The goal of this study was to develop a methodology for the demand forecast of tractor, riding type rice transplanter and combine harvester using an ARIMA (autoregressive integrated moving average) model, one of time series analysis methods, and to forecast their demands from 2012 to 2021 in South Korea. Methods: To forecast the demands of three kinds of machines, ARIMA models were constructed by following three stages; identification, estimation and diagnose. Time series used were supply and stock of each machine and the analysis tool was SAS 9.2 for Windows XP. Results: Six final models, supply based ones and stock based ones for each machine, were constructed from 32 tentative models identified by examining the ACF (autocorrelation function) plots and the PACF (partial autocorrelation function) plots. All demand series forecasted by the final models showed increasing trends and fluctuations with two-year period. Conclusions: Some forecast results of this study are not applicable immediately due to periodic fluctuation and large variation. However, it can be advanced by incorporating treatment of outliers or combining with another forecast methods.

  • https://doi.org/10.5307/JBE.2013.38.1.009 인용 PDF KSCI