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함영복(Young-Bog Ham),송종진(Jong-Jin Song),조원용(Won-Yong Cho),박중호(Jung-Ho Park),윤소남(So-Nam Yun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In precision machinery systems for electronic devices, due to the generation of heat, cooling system is essentially needed. Miniaturized pumps have been demanded for cooling water circulation and a low power consumption. To obtain sufficient performance for practical applications, in this paper, a piezoelectric pump composed of hinge-lever using multilayer PZT actuator to generate large displacement and two sheet type check valves to control flow direction are designed. First, hinge-lever mechanism consists of a pin hinge-lever and two multilayer PZT actuators. The metal bellows is used as a flexible pump chamber. The hinge-lever mechanism produces a 550㎛ displacement with free load. Second, a check valve with high response is applied and the basic characteristics are experimentally investigated with various shapes and thickness. As a result, the maximum flow rate of 1.3 l/min and maximum pumping pressure of 10 ㎪ are obtained with the driving frequency of 80 ㎐ at 100 V<SUB>p-p</SUB>.
함영복(Young-Bog Ham),윤동원(Dong-Won Youn),조원용(Won-Yong Cho),박중호(Jung-Ho Park),윤소남(So-Nam Yun),안국영(Kook-Young Ahn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Recently, piezoelectric actuator has been applied in the various fields of industry such as life science, automotive, IT and telecom. The PZT actuator is used by the reverse piezoelectric effect, which generated a mechanical displacement in the electric field. Because the displacement of this actuator is 1/1000 times of PZT element thickness or height with high voltage, this actuator has to combine with a displacement amplified mechanism. In this paper, the PZT actuator has 10 times amplified displacement using hinge-lever magnification mechanism. The free load displacement of multilayer PZT is 56㎛ at input voltage of 100Vdc, and the proposed mechanism has maximum amplified displacement of 684㎛ through the experiment. The frequency response of PZT actuator having hinge-lever mechanism is measured as resonance frequency. As a result, the resonance frequency of PZT actuator is 209.7㎐ in simulation and 204㎐ in experiment.
함영복(Young-Bog Ham),안병철(Byeung-Cheol An),Mojiz Abbas Trimzi,김종대(Jong-Dae Kim),이기태(Gi-Tae Lee),박중호(Jung-Ho park),윤소남(So-Nam Yun) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.10
마이크로 인젝션을 바이오분야에 적용하기 위해 고압생성을 통해 침투하는 방법을 채택하였다. 그러나 고압의 액체를 인젝션 할 경우 그 양을 미세하게 하기 어렵다. 이러한 문제를 해결하기 위해는 고속으로 동작하는 개폐밸브에 의한 방법이 있다. 본 연구에서는 수백 Hz로 동작가능한 압전 액추에이터로 구성된 개폐밸브를 적용하여 실험하였다. 압전밸브를 구동하는 파형을 다양하게 조절하고 노즐의 구조에 의한 영향을 알아보기 위해 5가지 서로 다른 치수의 노즐을 제작하였다. 다양한 노즐과 구동파형 변수를 조절하면서 무엇이 인젝션 볼륨과 인젝션 힘에 큰 영향을 미치는지 확인하였다. 이 실험을 통해, 인젝션 볼륨을 줄이고 인젝션 힘을 증가시키는 방법을 알아냈고 목표치가 있다면 그에 맞는 다양한 값을 결정할 수 있게 되었다. It is essential for micro jet injectors in the biomedical sector to operate under high pressure. High pressure injection, however, is accompanied by high volumes. On/Off valves that can be operated at high speeds have been used to address this problem. In this research, piezoelectric actuators which have a response frequency of the order of hundreds of kilohertz were used as the On/Off valve and experiments were applied. Researchers developed a controller to precisely manipulate the piezoelectric valve with various waveforms. They also fabricated five types of nozzles to consider the effect of nozzle type on injection. This allowed researchers to manipulate and confirm factors that can affect the injection volume and force. Results of this experiment have shown how to decrease the injection volume and increase the injection force. and it is predicted that the optimized injection volume and force value can be determined depending on the skin type.
함영복(Young-Bog Ham),유진산(Jin-San Yoo),윤소남(So-Nam Yun),최병오(Byung-Oh Choi) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Generally, flow-direction control servo valve can be used for speed and position control of hydraulic cylinder, and pressure control servo valve can be used for force control. In this paper, the simulation of dynamic force control characteristics of linear servo actuator which is consist of flow-direction control servo valve and low fiiction hydraulic cylinder was pcrformed. The simulation results indicate that the flow-direction control valve can be used to control the force of electro-hydraulic servo actuator for the test of automobile component and structure.