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RISS 인기검색어
- 검색키워드
- 저자 : Yeou-Feng Lue (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Performance evaluation on vacuum pumps using nanolubricants
Yeou-Feng Lue,Yu-Chun Hsu,Tun-Ping Teng 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.9
This study produced alumina (Al 2 O 3 ) nanovacuum-pump lubricants (NVALs) by involving the dispersion of Al 2 O 3 nanoparticles in a vacuum-pump lubricant (VAL) with oleic as a dispersant. Experiments were conducted to evaluate the suspension performance, thermal conductivity, viscosity, specific heat, tribological performance and vacuum-pump performance of the NVALs. The experimental results obtained from the vacuum-pump performance tests show that the NVALs with Al 2 O 3 concentration of 0.2 wt.% and oleic concentration of 0.025 wt.% yielded the lowest electricity consumption, conserving 2.39% of electricity compared with the VAL. No marked difference was observed between the temperatures of the vacuum pump using VAL and NVAL. Furthermore, evacuation (i.e., the minimal pressure of -99.5 kPa) was reached faster by the vacuum pump with the NVALs, and the evacuation time could be reduced by 4.91% under optimal conditions. In addition, the vacuum pump with the NVALs exhibited superior overall effectiveness under relatively lower ambient temperatures.
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Lue Yeou-Feng,Hsiao Wei-Liang,Chen Yi-Shun 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.2
Lubricants, such as any types of greases and oils, are usually used to reduce the effect of friction. However, they also have multifunctions that increase the overall performance and application life. To clarify how lubricants decrease friction and reduce friction-related issues, this study evaluated the performance of specific fuel consumption and exhaust emissions (such as hydrocarbon, carbon monoxide, and particulate matter) of motorcycle with nanosilica (nano-SiO2) added to the original lubricant. Lubricants with 0.5, 1.5, 2.5, 3.5, and 4.5 wt.% nano-SiO2 were evaluated after testing their basic properties and conducting tribology tests. The lubricant with 3.5 wt.% nano-SiO2 was the best candidate for the four-stroke engine motorcycle experiments. The results of the tribology experiment with nano-SiO2 lubricant showed that the abrasion loss corresponding to the 3.5 wt.% nano-SiO2 lubricant decreased by an average of 42.43 %. Overall, the 3.5 wt.% nano-SiO2 lubricant improved the effect of lubrication. The primary focus of the current study was the development of nano-SiO2 lubricant technology for applications in industry environments.
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Controlling chaos for automotive disc brake squeal suppression
Bao-Chau Lin,Shun-Chang Chang,Jui-Feng Hu,Yeou-Feng Lue 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
Disc brake squeal is a manifestation of friction-induced, self-excited instability in disc brake systems. This paper investigates the nonsmoothbifurcations and chaotic dynamics associated with braking systems. In most situations, decreasing squealing is a means to suppresschaotic disturbances, which would otherwise compromise the comfort of passengers. The proposed method begins with an estimationof the largest Lyapunov exponent using synchronization to differentiate between periodic and chaotic motions. We then observecomplex nonlinear behaviors associated with a range of parameters and plot them in a bifurcation diagram. Rich dynamics of disc brakesystems are examined using the bifurcation diagram, phase portraits, Poincaré maps, frequency spectra, and Lyapunov exponents. Finally,state feedback control is used to overcome chaotic behaviors and prevent squealing from occurring during braking. Finally, the effectivenessof the proposed control method is examined through numerical simulations.
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