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RISS 인기검색어
- 검색키워드
- 저자 : Nicholas Nnaemeka Okechukwu (검색결과 4 건)
- 무료
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Friction Assessment of Canola Oil on Contact Bearing Materials
Nicholas Nnaemeka Okechukwu,JaeYoung Byun,JongSoon Kim,JongMin Park,SoonGoo Kwon,SungWon Chung,SoonHong Kwon,WonSik Choi 한국트라이볼로지학회 2020 한국윤활학회지(윤활학회지) Vol.36 No.1
In manufacturing operations, oil plays a crucial role in reducing friction and wear among interacting surfaces at varying velocities, loads, and temperature. Hydrocarbon oil is considered the origin of lubrication oils. However, this base oil has been limited in its use as it is a principal cause of pollution. This research focuses on identifying a biodegradable base oil lubricant that possesses a stable coefficient of friction and viscosity with temperature. Friction analysis is conducted by employing a pin on a disk tribotester with a fixed load of 10 N at varying sliding speeds ranging from 0.06 m/s to 0.34 m/s. Oil viscosity analysis is perfomed at room temperature by using a rotary viscometer. Tests are performed using canola oil and paraffin oil as lubricants. The results indicate that the viscosity of canola oil is more efficient than paraffin oil. The non-dimensional characteristic number according to the Stribeck curve reveals an elastohydrodynamic lubrication regime with canola oil lubrication. A comparison of both lubricants reveals that, the friction efficiency of canola oil and paraffin oil does not differ considerably. However, the friction in canola oil is observed to decrease more than that in paraffin oil at an elevated sliding speed. The tests confirm that canola oil is potent in minimizing the friction coefficient of SCM440 bodies interacting with one another as well as acted upon by load.
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Friction Characteristics of Aluminized Polyester Fabric under Dry - and Water- Lubricated Conditions
JaeYoung Byun,Nicholas Nnaemeka Okechukwu,Eunsuk Lee,JinGyu Park,WonSik Choi 한국트라이볼로지학회 2019 한국윤활학회지(윤활학회지) Vol.35 No.6
Materials made from plastics are increasingly utilized in constructing greenhouses and setting up shield structures. Polyester fabrics have a wide range of use in horticulture and other fields of agriculture. They are utilized as a greenhouse cover and also help in combating intense climate variation in the field. Over time, these fabrics may experience friction against other surfaces. Owing to this, the surface framework of the material degenerates. This study examines the frictional characteristics of aluminized polyester fabric in both dry- and water-lubricated environments under changing applied loads and sliding speeds. Friction experiments are performed at room temperature by employing a pin on a disk. The experiments reveal that the friction coefficient decreases with increase in applied load in both dry sliding and water-lubricated environment. However, the friction coefficient decreases more under the water-lubricated setting than in the dry state. At the maximum applied load, the highest friction coefficient is discovered in the dry state with a range of 0.282 to 0.237, whereas a friction coefficient of 0.229 to 0.189 is observed in the water-lubricated state. Additionally, it is observed that the friction coefficient increases with an increase in sliding speed under both experimental environments. The examination of specimen surfaces reveals that the abrasion is minor in the water-lubricated setting compared with that in the dry state.
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Friction Characteristics of Aluminized Polyester Fabric under Dry - and Water- Lubricated Conditions
Byun, JaeYoung,Okechukwu, Nicholas Nnaemeka,Lee, Eunsuk,Park, JinGyu,Choi, WonSik Korean Tribology Society 2019 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.35 No.6
Materials made from plastics are increasingly utilized in constructing greenhouses and setting up shield structures. Polyester fabrics have a wide range of use in horticulture and other fields of agriculture. They are utilized as a greenhouse cover and also help in combating intense climate variation in the field. Over time, these fabrics may experience friction against other surfaces. Owing to this, the surface framework of the material degenerates. This study examines the frictional characteristics of aluminized polyester fabric in both dry- and water-lubricated environments under changing applied loads and sliding speeds. Friction experiments are performed at room temperature by employing a pin on a disk. The experiments reveal that the friction coefficient decreases with increase in applied load in both dry sliding and water-lubricated environment. However, the friction coefficient decreases more under the water-lubricated setting than in the dry state. At the maximum applied load, the highest friction coefficient is discovered in the dry state with a range of 0.282 to 0.237, whereas a friction coefficient of 0.229 to 0.189 is observed in the water-lubricated state. Additionally, it is observed that the friction coefficient increases with an increase in sliding speed under both experimental environments. The examination of specimen surfaces reveals that the abrasion is minor in the water-lubricated setting compared with that in the dry state.
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변재영 ( Jae Young Byun ),오케추쿠나에메카니콜라스 ( Okechukwu Nnaemeka Nicholas ),이은숙 ( Eun Suk Lee ),양지웅 ( Ji Ung Wang ),김국현 ( Kuk Hyeon Kim ),김근우 ( Geun Woo Kim ),박진규 ( Jin Gyu Park ),최원식 ( Won Sik Choi ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
기후가 급격히 변함에 따라 농작물의 생산환경이 급변하고 있으며, 폭설, 폭우, 혹서 등의 환경에 대해 독립된 환경을 조성하고자 스마트팜이 화두가 되고 있다. 더불어 인구고령화와 노동력 부족, 생산성 효율 등의 문제로 식물공장을 통한 무인재배 환경을 만들기 위해 다양한 시도가 이루어지고 있다. 국내에서는 비닐하우스와 유리온실이 주로 사용되고 있으며 무인 환경을 조성하기 위해서 비닐하우스는 겨울철 난방문제와 유리온실의 여름철 고온에 대한 냉방 문제를 해결해야 한다. 작물 및 지역 조건에 맞는 냉난방 온도를 효율적으로 제어할 수 있는 시스템 구축이 필요하다. 이에 본 논문에서는 온·습도 변화에 민감한 표고버섯을 이용하였으며, 품질안정화와 노동력 저감, 수확량 증가를 위해 수직형 체인 컨베이어 형식의 재배사와 생육 관수 및 습도, 조명, 이산화탄소를 무인으로 제어할 수 있는 스마트팜 환경제어 시스템을 제안한다. 재배사에 부착된 각종 센서를 통해 실시간으로 수분 공급 및 환기를 통해 버섯의 생육하는 데 최적화된 상태를 제공한다. 이를 통해 기존에 시행되고 있는 재래식 방식의 버섯재배사의 문제점인 상하의 상태차이로 인한 품질이 균일하지 못한 점을 해소하고 컨베이어 형식으로 사용자의 노동력 및 시간관리에 도움을 줄 수 있다. 또한 동일한 공간 활용 시 기존의 재배사 보다 높은 생산량을 확보 할 수 있다.
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