Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Biosystems Engineering
Journal Basic Information
Journal DOI :
Korean Society for Agricultural Machinery
Editor in Chief :
Volume & Issues
Volume 32, Issue 6 - Dec 2007
Volume 32, Issue 5 - Oct 2007
Volume 32, Issue 4 - Aug 2007
Volume 32, Issue 3 - Jun 2007
Volume 32, Issue 2 - Apr 2007
Volume 32, Issue 1 - Feb 2007
Selecting the target year
Reduction of Rattle Noise in a Direct-Engine PTO Driveline Using an Anti-backlash Gear
Shim, Sung-Bo ; Park, Young-Jun ; Kim, Kyeong-Uk ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 137~144
DOI : 10.5307/JBE.2007.32.3.137
An anti-backlash gear was developed to reduce the rattle noise generated from the gearbox of a direct-engine PTO driveline of agricultural tractors under idling. A pair of gears using the anti-backlash gear as driven part was modeled and verified. Using the verified model, a computer simulation was conducted to investigate the effects of design parameters of the anti-backlash gear on the reduction of rattle noise. The optimum values of the design parameters were also determined by the computer simulation. The optimized anti-backlash gear was then manufactured and installed on the experimental PTO driveline for the performance test. Measurement of rattle noise was made to evaluate its performance before and after the driven gear of the PTO gearbox was replaced by the optimized anti-backlash gear. Results of the study were as follows: The optimum values of the design parameters, spring constant and deformation, may be determined by a relationship:
The optimized anti-backlash gear reduced the rattle noise maximally by 16.9 dBA. This concluded that it would be most effective to use the optimized anti-backlash gear to eliminate the rattle noise in the PTO driveline.
Spray Deposit Distribution of a Small Orchard Sprayer
Koo, Young-Mo ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 145~152
DOI : 10.5307/JBE.2007.32.3.145
Uniformity of spray deposit is one of the important factors in spray performance affecting efficacy of pest management. Distributions of spray deposit on artificial targets were measured and analyzed to enhance the efficiency of spray application. The research was studied to understand the deposition characteristics of spray droplets and to determine the optimum conditions of chemical application. The deposit and its pattern by the lower fan speed was more uniform and higher than that by the higher fan speed. The upward blasting distance was limited within 3 m, but the limit to the ground level was expanded the distance more than 3.5 m because of the accumulated droplets. When the fan speed was higher at the distance of 2.5 m, deposit reached to maximum. When the distance increased, deposit was getting lower. At the both fan speeds, the deposit was concentrated below
because of the gravitation and the resistance of wind. This research can be useful in designing an orchard sprayer and its operation for various tree canopies. To achieve a uniform distribution of deposit using the air-blast type orchard sprayer, the application rate from the middle boom should be increased as the air velocity to the upward increased. The spray rate to the side boom should be limited in a minimal level.
Analysis and Reduction Method of Noise from Head of a Combine Harvester
Kim, Ho-Jung ; Park, Young-Joon ; Shim, Sung-Bo ; Kim, Kyeong-Uk ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 153~159
DOI : 10.5307/JBE.2007.32.3.153
This study was conducted to measure and analyze the noise from a combine head. The combine head, comprised of a cutting knife assembly, pick-up chains, horizontally conveying chains and vertically conveying chains, had an overall sound level of 101 dBA. The sound levels of each component were, respectively, 98.3 dBA for the cutting knife assembly, 88.9 dBA for the pick-up chains, 79.8 dBA for the horizontally conveying chains and 86.3 dBA for the vertically conveying chains, being equivalent to 54.4%, 18.4%, 6.5% and 13.7% of the overall head noise. The main cause of the head noise was considered the impacts that the joint of the cutting knife assembly made with frame when it oscillated. The impact sound was also generated when the chain lug collided with the chain case. To reduce these impact sound, anti-vibration rubbers were installed on the knife assembly joint and the chain cases. It reduced the head noise by 4 dBA but the overall noise level of the combine head was still high. In order to protect the combine operators more effectively from the noise, a safety cab needs to be installed on the combine.
Quantization and Calibration of Color Information From Machine Vision System for Beef Color Grading
Kim, Jung-Hee ; Choi, Sun ; Han, Na-Young ; Ko, Myung-Jin ; Cho, Sung-Ho ; Hwang, Heon ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 160~165
DOI : 10.5307/JBE.2007.32.3.160
This study was conducted to evaluate beef using a color machine vision system. The machine vision system has an advantage to measure larger area than a colorimeter and also could measure other quality factors like distribution of fats. However, the machine vision measurement is affected by system components. To measure the beef color with the machine vision system, the effect of color balancing control was tested and calibration model was developed. Neural network for color calibration which learned reference color patches showed a high correlation with colorimeter in L*a*b* coordinates and had an adaptability at various measurement environments. The trained network showed a very high correlation with the colorimeter when measuring beef color.
Determination of Egg Freshness and Internal Quality Measurement Using Image Analysis
Kim, Hyeon-T. ; Ko, Han-J. ; Kim, Ki-Y. ; Kato, K. ; Kita, Y. ; Nishizu, T. ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 166~172
DOI : 10.5307/JBE.2007.32.3.166
Egg quality indices are related with freshness, size of air chamber, loss of weight, and viscosity of the yolk and the protein. However, since the described quality parameters require measured in a destructive way, it is not suitable to inspect the egg quality with complete enumeration. Therefore, this study was performed to investigate the potential of image analysis method for evaluation of internal egg quality. Samples of 90 fresh eggs were collected immediately after laying and stored up to 24 days. Five eggs were randomly drawn from each storage condition (packing vs unpacking) at a regular interval and loss of weight, specific gravity and size of air chamber were measured. The image analysis for nondestructive measurement of size of air chamber was also studied. Results showed that the egg weight and gravity gradually decreased with increasing of storage days, while the size of air chamber linear increased caused by evaporation of water through the shell. A relationship a between conventional method and the image analysis method for measuring the size of air chamber was developed with the correlation coefficient of 0.928. The new finding implied that image analysis might provide a useful nondestructive tool to assess internal egg quality.
Development of Wireless Monitoring System for Layers Rearing in Multi-tier Layers Battery by Machine Vision
Lim, Song-Su ; Chang, Dong-Il ; Lee, Seung-Joo ; So, Jae-Kwang ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 173~178
DOI : 10.5307/JBE.2007.32.3.173
This research was conducted to develop and analyze a wireless monitoring system for judging if sick or dead layers (SDL) exist in multi-tier layers battery (MLB) by machine vision, and to evaluate the performance between a wired monitoring system and it. This study used the AP (Access Point), the RS-285 to RS-232 converter, RS-232 to Ethernet converter, PICBASIC board and upgraded lump image processing method to change wired monitoring system into wireless monitoring system. The system was tested at a pilot farm and farm layer house. Results showed that monitoring judgement success rate at a pilot farm on normal cage (without SDL) was 82.3% and that on abnormal cage (with SDL) was 87.5%, respectively. And communication performance test results showed at farm layer house was
kbps while equipments operated. There were dropped slightly than performance of wired monitoring system, however, the quantity was too small to make a significant difference of performance of the controling system developed for wireless communication.
Development of an Automatic Seeding System Using Machine Vision for Seed Line-up of Cucurbitaceous Vegetables
Kim, Dong-Eok ; Cho, Han-Keun ; Chang, Yu-Seob ; Kim, Jong-Goo ; Kim, Hyeon-Hwan ; Son, Jae-Ryoung ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 179~189
DOI : 10.5307/JBE.2007.32.3.179
Most of the seeds of cucurbitaceous rootstock species used for grafting were mainly sown by hand. This study was carried out to develop an on-line discriminating algorithm of seed direction using machine vision and an automatic seeding system. The seeding system was composed of a supplying device, feeding device, machine vision system, reversing device, seeding device and system control section. Machine vision was composed of a color CCD camera, frame grabber, image inspection chamber, lighting and personal computer. The seed image was segmented into a region of seed part and background part using thresholding technique in which H value of HSI color coordinate system. A seed direction was discriminated by comparing position between the center of circumscribed rectangle to a seed and the center of seed image. It took about 49ms to identify and redirect seed. Line-up status of seed was good the more than 95% of a sowed seed. Seeding capacity of this system was shown to be 10,140 grains per hour, which is three times faster than that of a typical worker.
Development of Measurement System of Cutter Conditions for Combine Diagnosis (I) - Analysis of Vibration and Load Signals -
Choi, Chang-Hyun ; Kim, Yong-Joo ; Kim, Jong-Hyuck ; Mun, Joung-Hwan ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 190~196
DOI : 10.5307/JBE.2007.32.3.190
The purpose of this study is to develop a measurement system of cutter conditions for combine header diagnosis during rice harvesting. A load cell was installed at the locker-arm to measure load fluctuation and an acceleration senor was used to monitor vibration signal of cutter bar. The data were collected from a paddy field during harvesting. The tests were conducted with a normal cutter, a loosened cutter, a broken cutter, and a worn-out connecter pin at the field. The vibration signals converted by FFT (Fast Fourier Transformation), filtered, and normalized. The load data and peak values of vibration signals in four different frequency ranges were used to determine the cutting operation and the cutter conditions of combine. The multiple comparison tests showed that the load data and peak values of vibration signals were important to monitor the cutting operation and cutter conditions of combine header.
Design and Implementation of the Gateway for Remote Monitoring a Combine
Moon, Y.K. ; Song, Y.H. ; Shin, K.Y. ; Lee, S.S. ; Choi, C.H. ; Mun, J.H. ;
Journal of Biosystems Engineering, volume 32, issue 3, 2007, Pages 197~205
DOI : 10.5307/JBE.2007.32.3.197
The objective of this study was to design and implement a gateway for remote monitoring a combine. Many researchers have designed and implemented trouble-shooting system of agricultural machine. but the system didn't have network system or used wired network system. But monitoring machine have been operated in the out of door. In such an environment, each machine have to be operated under on a guarantee of mobility and stability. Thus, we have developed a gateway with an embedded system including the XScale PXA255 processor and wireless network device. We have also built an embedded Linux kernel and several devices. We developed an embedded application for monitoring a combine and this application is also capable of receiving signals from other clients and sending them to a server via Wireless LAN. Finally, results of performance evaluation which measured CPU share and memory sizes have shown that it is possible to provide monitoring service stably.