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RISS 인기검색어
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- 발행기관 : IOS PRESS B.V (검색결과 3 건)
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Design and control of multi-step SMA actuator
Lee, Yun-Jung,Son, Hyung-min,Gu, Jun-bum,Nam, Tae-hyun IOS PRESS B.V 2006 INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS Vol.23 No.1-2
<P>To balance the control complexity and number of controlled positions, a novel multi-step SMA actuator is proposed that has multiple controlled positions and can be actuated by sensor-less and open-loop control. The proposed multi-step SMA actuator is constructed so that several electrical taps are connected to one SMA wire and the sections between the taps are all the same length. The controlled positions then vary stepwise according to the number of actuated sections. To control the multi-step SMA actuator, a PWM(pulse width modulated) voltage with an appropriate duty ratio is applied to designated sections while considering the resistance value of the sections, as well as the recommended current for the given SMA wire. To verify the effectiveness of the proposed multi-step SMA actuator, experiments were performed using a single nitinol wire actuator with a bias spring mechanism and electronic control system.</P>
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Fabrication of Ti-Ni alloys for proportional control
Nam, Tae-hyun,Yu, Cheo-am,Lee, Yun Jung,Liu, Yinong IOS PRESS B.V 2006 INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS Vol.23 No.1-2
<P>Phase transformation and deformation behavior of temperature-gradient annealed (TGA) equiatomic Ti-Ni alloy wires were investigated by means of differential scanning calorimetry (DSC), thermal cycling under constant load and tensile testing. TGA treatment in a temperature range of 658∼823 K caused variations of 10 K in <TEX>$T_{R}$</TEX>* and 14 K in <TEX>$M_{s}$</TEX> along the length of the specimen. Temperature dependence of specimen elongation (dϵ/dT) of TGA treated Ti-Ni alloy wires was in the range of 0.12∼0.43%/K depending on annealing temperatures. The lowest dϵ/dT was obtained in the sample annealed in the temperature range of 658∼713 K. The stress for martensite reorientation remained nearly constant for the specimen annealed in the temperature range of 740∼823 K, whereas that for the specimen annealed in the temperature range of 658∼740 K increased continuously with increasing strain. </P>
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Norina, Svetlana B.,Kim, Jungdae,Soh, Kwang-Sup IOS PRESS B.V 2007 INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS Vol.25 No.1-4
<P>A magnetic capture of chromatin particles, ferritin, bacterial cells and shrimps was effectively used to measure the magnetic susceptibility, Fourier-spectra, and real-time graphs. In the high gradient magnetic separation (HGMS) using the low-frequency photo-detection the new dynamical bio-particle parameters were obtained. The concentration phase transitions and the diamagnetic alignment were revealed for colloid suspensions of the chromatin particles and the nuclei of chicken red blood cells in the HGMS. A biosensor detecting dynamical changes in the refractive index using a spectroscopy of intensity fluctuations was combined with the HGMS to detect a diamagnetic and paramagnetic capture, liquid-crystalline phase transitions in DNA containing particles, a dynamical autofluorescence and frequency spectra. Chicken red blood cell nuclei formed liquid-crystalline very bright (cholesteric) tubular-hexagonal structures and networks under their diamagnetic alignment in high gradient magnetic fields.</P>
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