• Title/Summary/Keyword: 트랙터 안전캡

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A Case Study on Inside Noise Reduction of Agricultural Tractor Cab(I) -Analysis of Sound and Sound Intensity Levels- (농용 트랙터의 안전캡 내부 소음 감소에 관한 연구( I ) -소음과 음향 강도 수준 분석-)

  • 유동호;김경욱;김재열
    • Journal of Biosystems Engineering
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    • v.20 no.2
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    • pp.117-126
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    • 1995
  • High level of tractor noise may reduce operator's work performance and cause a hearing problem. This study was carried out to investigate the cab noise of a selected agricultural tractor. The noise was measured and analyzed in terms of sound and sound intensity levels. Form the results it was known that a structure-born noise was induced from the feet-rest and rear floor panel of the cab. The air-borne noise caused mainly by the engine was transmitted into the operator's position through the small openings of cab structures in the operator's lower front area.

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A Case Study on Inside Noise Reduction of Agricultural Tractor Cab(II) -Noise Reduction- (농용 트랙터의 안전캡 내부 소음 감소에 관한 연구(II) -소음 감소 효과-)

  • 유동호;김경욱;최창현
    • Journal of Biosystems Engineering
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    • v.20 no.2
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    • pp.127-132
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    • 1995
  • In the first part of this paper, an analysis of the cab noise of a selected agricultural tractor was presented. In this study, using the results of the previous analysis, two passive noise control measures of the sound insulation and absorption were conducted to reduce the noise level inside the cab. These measures of noise control reduced the total noise level by 6.2㏈(A) at the operator position inside the cab. In order to further reduce the cab noise, particularly, of lower frequencies than 630Hz, stiffness and damping of the floor panel should be enforced. It was also suggested that a proper suspension for the cab mounting is necessary to reduce the level of structure-born noises.

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Optimum Design of Cab Suspension for Agricultural Tractors (농용 트랙터 안전캡 현가 장치의 최적 설계)

  • 최현준;김경욱;김종언
    • Journal of Biosystems Engineering
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    • v.23 no.4
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    • pp.327-334
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    • 1998
  • This work was intended to determine the optimum values of the cab suspension parameters by a simulation method in order to minimize the seat accelerations of agricultural tractors in the frequencies lower than 50Hz. A dynamic model of cab motions was developed and verified using a tractor excited over half-sine bumps on a concrete test road. A simulation program based on the model was also developed. A method was proposed to determine the optimum values of the suspension parameters. It was found that the natural frequencies of the cab and seat suspensions must be apart as far as possible until the sum of seat and cab accelerations is minimized, which also reduces the seat accelerations maximally.

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Evaluation of Environmental Comfort of Tractor Cabs (트랙터 안전캡의 환경 쾌적성 평가)

  • Hwang, Ki-Young;Kim, Kyeong-Uk
    • Journal of Biosystems Engineering
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    • v.34 no.1
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    • pp.1-7
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    • 2009
  • In order to evaluate environmental comfort of tractor cabs, temperature, relative humidity and noise within the cab were taken from 31 tractors during plowing and rotovating operations. The temperature and humidity were evaluated with regard to the comfort zone of KS B ISO 14269-2 and PMV of ISO 7730. The noise was evaluated with regard to the permissible sound level of OSHA for daily exposure of 8 hours. The collected data indicated that thermal environment of the cabs was out of the comfort zone, which meant tractor operators worked under uncomfortable thermal conditions. Difference in the thermal comfort by tractor power and maker, and type of works was not found. However, 25% of the studied tractors showed PMV in a range of -0.5 to +0.5, which indicated their operators worked under the comfort criteria. PMV was improved when the cab was air-conditioned. Levels of measured cab noise were lower than the permissible criteria, and 76.7% of the studied tractors had cab noise ranged from 75 to 85 dBA. There was a tendency that high powered tractors, rotovating operations and locally-made tractors had greater cab noise levels. However, their differences were insignificant.