• Title/Summary/Keyword: Oil Contaminant

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Floor Slipperiness Effect on the Biomechanical Study of Slips and Falls

  • Myung, Ro-Hae;Smith, James L.;Lee, Soon-Yo
    • Journal of Korean Institute of Industrial Engineers
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    • v.22 no.3
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    • pp.337-349
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    • 1996
  • A study was conducted to find the possible relationship between slip distance and dynamic coefficient of friction (DCOF) through the biomechanical study of slips and falls using a broader variety of floors and levels of slipperiness than those used before. Four different floor surfaces covering the full range of floor slipperiness (with and without on oil contaminant) were prepared for ten subjects with each walking at a fixed velocity. The results showed that slip distance and heel velocity had a decreasing trend while stride length had a increasing trend as DCOF increased. The contaminant effect overpowered floor slipperiness effect because a higher DCOF surface with oil contaminant created longer slip distance than the lower DCOF with dry floor. Normal gait pattern and suggested heel velocity (10 to 20 cm/sec) were seen on dry floors but abnormally longer stride length and 5 to 10 times faster heel velocity were found an oily floors. In other words, faster heel velocity (greater than 10 to 20 cm/sec) is recommended to measure DCOF on oily floors because the assumption of normal gait was no longer valid.

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Preliminary Study on Disposal of Waste Wooden Sleeper by Thermal-Extraction (열추출기술을 이용한 폐목침목처리 기초연구)

  • Kwon, Tae-Soon;Lee, Jae-Young;Jung, Woo-Sung
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.2875-2878
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    • 2011
  • The wooden sleeper has been used at the railway track. Recently the concrete sleeper is pushing the wooden sleeper out, but huge amount of waste wooden sleepers are discharged every year. Due to the contaminant of waste wooden sleeper, its disposal is very difficult. Commonly a wood preservative such as creosote is used in the manufacturing process and it becomes major contaminant after use. And the wooden sleeper is contaminated by diesel from locomotives and lubricant oil from the maintenance of railway turnout. Currently the limitary disposal methods can be used because of high toxicity of waste wooden sleeper. Therefore the preliminary study on thermal-extraction of contaminants such as creosote, diesel and lubricant oil from waste wooden sleeper was conducted and the effects of factors were investigated.

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Investigation on the Effect of Stress Waves on Soil Flushing (토양세척에 있어서 탄성파의 효과에 관한 연구)

  • 김영욱;김지형;이인모
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2000.05a
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    • pp.37-40
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    • 2000
  • Acoustically enhanced soil flushing method is a newly developed in-situ remediation technique. However, there has not been an analytical method that can be used to evaluate the effectiveness of ultrasonic wave under different conditions. This study was undertaken to investigate the degree of enhancement in contaminant removal due to ultrasonic energy on the soil flushing method. The test conditions included different levels of ultrasonic power and hydraulic gradient. The test soils were Ottawa sand, a fine aggregate, and a natural soil, and the surrogate contaminant was a Crisco Vegetable Oil. The test results showed that sonication could increase contaminant removal significantly. Increasing sonication power increased pollutant removal. The faster the flow is, the smaller the degree of enhancement will be. The pollutants in dense soils are more difficult to be removed than in loose soils.

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Verification of Control Algorithm for Removing Oil Contaminant Factor from Proportional Pressure Control Valve (전자식 비례 압력제어밸브 내 오일 오염 입자 제거 제어 알고리즘 검증)

  • Cheon, Su Hwan;Park, Jin Kam;Jang, Kyoung Je;Sim, Sung Bo;Jang, Min Ho;Lee, Jin Woong
    • Journal of Drive and Control
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    • v.18 no.4
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    • pp.1-8
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    • 2021
  • An electro proportional pressure control valve is mainly used to control the clutch of an agricultural tractor's automatic transmission. During transmission, the operating, hydraulic oil is mix with many kinds of contaminants. The contaminants can be trapped between the valve body and spool of the proportional pressure control valve leading to abnormal operating conditions and finally critical damage to the transmission hydraulic system. The present study aimed to verify the valve control algorithm as a basic study of developing control logic that removes contaminants between the spool and the body of the proportional pressure control valve. To develop the algorithm, MATLAB/SIMULINK was used. PWM method was used to control the applied solenoid coil current. The effectiveness of the algorithm was verified by comparing the actual pressure of the normal valve with the actual pressure of the abnormal valve. Based on the present study findings, when the algorithm was applied, the response of the valve pressure according to the current became stable and oil contaminated particles were removed. In the future study, the control algorithm will be optimized for the stability of the proportional pressure reducing valve, and it will be verified in consideration with the driving of the clutch.

Analysis of the Correlation between Compaction Characteristics and Spectral Information of Reactive Materials for Absorption of Oil Contaminant (유류 오염물 흡수가 가능한 반응재료의 다짐 특성-분광정보 상관관계 분석)

  • Gigwon Hong
    • Journal of the Society of Disaster Information
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    • v.19 no.4
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    • pp.950-957
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    • 2023
  • Purpose: The response technology is needed to prevent the spill of highly toxic oil contaminants in advance. Therefore, this paper described the results of an experimental study to predict the engineering properties of the developed reactive material. Method: Compaction tests and spectral information acquisition experiments were conducted on the reactive materials, and the results were evaluated. In addition, the correlation between spectral information and maximum dry unit weight was analyzed to evaluate the possibility of predicting the engineering properties for reactive materials. Result: The compaction test results showed that the maximum dry unit weight was in the range of approximately 9kN/m3 to 10kN/m3. The spectral information confirmed that the maximum reflectance decreased as the polynorbornene decreased. Conclusion: It was confirmed that the maximum dry unit weight of the reactive material for absorbing oil contaminants can be predicted using the maximum reflectance according to the component ratio of the reactive material.

Development of Oil Flushing System with Microbubble Generator (마이크로 버블 발생장치와 결합된 오일 플러싱 장치 개발)

  • Hong, Sung-Ho;Lee, Kyung-Hee;Jeong, Nam-Wha
    • Tribology and Lubricants
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    • v.38 no.3
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    • pp.109-114
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    • 2022
  • This paper reports the development of an oil flushing system combined with a microbubble generator. Oil flushing plays a crucial role in regulating the lubricant's performance during the lubricant replacement process. Moreover, harmful contaminants, such as sludge, wear particles, and rust, from piping systems or lubrication system can be removed by oil flushing. Oil flushing aims to increase the system's efficiency using a dedicated flushing oil, increasing of the supply pressure and generating a vortex. In addition, it helps the mechanical system or equipment achieve peak performance and reduces the potential for premature failure. However, the contaminant-removal applications of existing oil flushing system are limited. In this research, we aim to improve the performance of oil flushing system by incorporating a microbubble generator, which uses the venture effect to generate microbubbles and mixes them with lubricant. The microbubbles in the blended lubricant remove contaminants from the lubrication system more effectively. Structural mechanics and fluid dynamics are analyzed through fluid-structure interaction (FSI) analysis, and the numerical analysis results are used for the designing the system. The magnitude of the maximum stress is investigated based on the pressure results obtained by the CFD analysis; through the CFD analysis, the mixing ratio of air (bubble) and lubricant is evaluated using the volume of fluid (VOF) model according to the working conditions.

Investigation of Ground Environment Around Underground Oil Storage Facilities Using the Envi-Cone Penetrometer System (환경콘에 의한 지하유류 저장시설주변 지반환경 조사)

  • 정하익;홍승서;김영진;홍성완;곽무영
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.273-280
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    • 2000
  • In recent years there has been a steady increase in geoenvironmental engineering projects where geotechnical engineering has been combined with environmental concerns. Many of these projects involve some investigation of contaminant in the ground. There are many techniques such as geophysical, drilling, sampling, md pushing techniques for investigation of contaminated ground. The most rapidly developing site characterization techniques for geoenvironmental purposes involve direct push technology, that is, penetration tests. The purpose of this study investigated underground oil storage tanks(USTs) using the envi-cone penetrometer system. The electrical resistivity sensor, pH sensor, ORP sensor, and thermometer are installed in envi-cone penetrometer system. This envi-cone penetrometer system provides a continuous profile of measurements, and it is rapid, repeatable, reliable and cost effective for investigation of contaminated ground surrounding the underground oil storage tanks.

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A Study on the Effects of Contaminant Types on the Wear Degradation Characteristics in Internal Gear Pumps (불순물 입자의 유형에 따른 내접기어 펌프에서의 마모열화 특성 연구)

  • Shin, Jung-Hun;Ji, Kyung-Ryeol;Kim, Hyoung-Eui
    • Tribology and Lubricants
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    • v.27 no.3
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    • pp.134-139
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    • 2011
  • The mechanical equipments which are exposed to impure environment undergo significant reductions in their own lifetimes. Several environmental test procedures have been developed to analyze these phenomena. Moreover in the industry to require shorter development duration, accelerated life testers artificially add test containments into machines. In this research JIS Z 8901 test powder was added into internal gear pumps which are used as oil pumps in vehicles and thus the effects of the addition on the degradation of the pumps were examined. Three kinds of contaminants were selected. Two of the contaminants are identical in particle size but different in the composition of the ingredients. The other pair have identical ingredients and composition but different particle size. The quantity of contaminants was also an interesting factor in this study. The results show that each JIS contaminant caused notable degradation in the discharge flow characteristic of pumps while friction torque degradation did not have any tendency. Finally leakage rates were deduced and equivalent wear volume ratios were calculated.

Removal of heavy metal and organic matter by electrokinetic ultrasonic remediation technology

  • Chung, Ha-Ik;Oh, In-Kyu
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2002.09a
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    • pp.210-214
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    • 2002
  • In this study, the coupled effect of electrokinetic and ultrasonic remediation technology was investigated for removing of heavy metal and organic matter at the same time. The laboratory tests were conducted using specially designed and fabricated electrokinetic and ultrasonic devices. The electrokinetic technique was applied to remove mainly the heavy metal and the ultrasonic technique was applied to remove mainly organic substance in contaminated soil. Diesel fuel and Cd were used as a surrogate contaminant for this test. A series of laboratory experiments involving electrokinetic and electrokinetic+ultrasonic flushing test were carried out. An increase in permeability and contaminant removal rate was observed in electrokinetic+ultrasonic flushing test.

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Compaction Characteristics of Reactive Material for Absorption of Underground Oil Contaminant (지중 유류 오염물 흡수를 위한 반응재료의 다짐 특성)

  • Hong, Gigwon;Lee, Jai-Young;Oh, Seung-Jin;Kim Su-Hee;Park, Jeong-Jun
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2023.11a
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    • pp.337-338
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    • 2023
  • 본 논문에서는 유류 오염물의 흡수 반응이 가능한 반응재료에 대하여 지중 구조 재료로서의 적용성 검토를 목적으로 배합조건에 따른 다짐시험을 실시하였다. 다짐시험 결과, 주요 반응물질이 최적함수비에 미치는 영향은 미미하였으나, 최대건조단위중량의 영향인자로 평가되었다.

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