http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박중호(Jung-Ho Park),서미영(Mi-Young Seo),함영복(Young-Bog Ham),윤소남(So-Nam Yun),이성휘(Sung-Hwi Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
For application in DMFC(Direct Methanol Fuel Cell), this study presents a design concept, fabrication and pumping characteristics of a novel piezoelectric pump using resonance and fluid inertia. The pump consists of a resonantly-driven pumping unit, an inlet check valve, and an outlet pipeline element with a small diameter. The resonance mechanism simply magnifies a displacement of the piezoelectric actuator like a mass-spring vibration system. The fluid inertia effect using narrow pipeline element instead of the outlet check valve results in a fast flow of the pipeline element. A prototype pump is fabricated with the size less than 2.0×2.0×2.2㎤, and then pumping characteristics such as displacement and flow rate on driving frequency are experimentally investigated and discussed.
박중호(Jung-Ho Park),요시다 카즈히로(Kazuhiro Yoshida),요코타 신이치(Shinichi Yokota),함영복(Young-Bog Ham),윤소남(Sonam Yun) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A novel piezoelectric micropump using active check valves in place of conventional passive check valves in inlet and outlet has<br/> been proposed and investigated. It actively controls open/close motion of check valves using piezoelectric actuator for<br/> expansion/contraction of pump chamber. In this paper, bi-directional flow characteristics and load characteristics are experimentally<br/> investigated using an adequate timing control for valve closing motion with a prototype micropump fabricated with the effective size<br/> of 17×8×11mm3. From the experimental results, it is ascertained that optimal values of phase shift against voltage to drive pump<br/> chamber for realization of a miniaturized but powerful micropump, are 15° in inlet check valve and 195° in outlet. Based on the<br/> obtained results, a sheet-type active shuttle valve that has a unified valve-body for inlet and outlet check valves is proposed. A<br/> micropump with the effective size of 10×10×10mm3 is fabricated and basic characteristics are experimentally investigated.
박중호(Jung-Ho Park),김진규(Jin-Gyu Kim),윤동원(Dong-Won Youn),함상용(Sang-Yong Ham),노종호(Jong-Ho Noh),유진산(Jin-San Yoo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
MR fluid is a suspension of micrometer-sized magnetizable particles in silicon oil and a functional fluid whose apparent viscosity can be controlled by the applied magnetic field strength. In this paper, a rotary brake using MR fluid called MR brake for tension control of precision machinery such as roll-to-roll printing machinery is presented. First, to obtain the higher performance than conventional powder brake, a MR brake with a modified rotor shape is newly designed and analyzed using FEM. Second, the prototype of MR brake is fabricated with the optimized structural parameters and an experimental apparatus is constructed. Then, basic characteristics of the MR brake are investigated with the different MR fluids. Finally, the validity of the developed MR brake is verified through the comparison with the conventional powder brake.
전단모드형 효과를 이용한 MR 피니언 샤프트의 디버링에 관한 연구
박중호(Jung-Ho Park),김홍욱(Hong-Uk Kim),허필우(Pil-Woo Heo),정은아(Eun-A Jeong),신경호(Kyung-Ho Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, we propose a new approach for MR(Magneti-rheological) Fluid. MR fluid is a type of smart material whose apparent viscosity and yield stress can be easily controlled by an external magnetic field without moving parts. A new deburring technology using MR effect under shear mode is proposed for pinion shaft employed in steering system. Unlike conventional pinion shafts, steering pinion shafts for automobiles equipped with new functions such as LKA(Lain Keeping Assist) and/or autonomous driving require machining due to their special shape, which results in burrs. The proposed mechanism removes burrs by using the MR effect that occurs between the rotating and vibrating shaft and the MR fluid filled in the container. Prototype apparatus using permanent magnets is fabricated, and basic tests on deburring are experimentally investigated and discussed.