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Origin of strain-induced resonances in flexible terahertz metamaterials
孙,秀云,郑,立人,李枭,宁,徐华,梁先庭,张,贤,鹏,鲁,越晖,宋伟,杰 IOP 2016 Chinese Physics B Vol.25 No.5
<P>Two types of flexible terahertz metamaterials were fabricated on polyethylene naphthalate (PEN) substrates. The unit cell of one type consists of two identical split-ring resonators (SRRs) that are arranged face-to-face (i.e., FlexMetaF); the unit cell of the other type has nothing different but is arranged back-to-back (i.e., FlexMetaB). FlexMetaF and FlexMetaB illustrate the similar transmission dips under zero strain because the excitation of fundamental inductive–capacitive (LC) resonance is mainly dependent on the geometric structure of individual SRR. However, if a gradually variant strain is applied to bend FlexMetaF and FlexMetaB, the new resonant peaks appear: in the case of FlexMetaF, the peaks are located at the lower frequencies; in the case of FlexMetaB, the peaks appear at the frequencies adjacent to the LC resonance. The origin and evolution of strain-induced resonances are studied. The origin is ascribed to the detuning effect and the different responses to strain from FlexMetaF and FlexMetaB are associated with the coupling effect. These findings may improve the understanding on flexible terahertz metamaterials and benefit their applications in flexible or curved devices.</P>
高調波를 利用한 三相籠型 誘導電動機의 低速制御에 관한 연구
金樹運 울산대학교 1981 연구논문집 Vol.12 No.1
본 논문은 3상농형유도전동기를 고조파와 불평형회전자계를 이용하여, 100~400rpm의 저속범위에서 원활하게 속도를 제어할 수 있음을 보여주고 있다. 고조파의 발생은 변압기의 철손과 전동기의 공극으로, 불평형회전자계는 SCR의 한방향만의 위상제어와 오실레이터의 on-off 제어주파수로써 만들어지고 있다. 이 방법은 문부하와 정격부하에서 잘 적용됨을 알 수 있었다. This paper presents the variable speed control of three phase inducation motor in the low region 100-400r.p.m. by using of the harmonics and unbalanced rotating magnetic field. The generation of harmonics is made from the iron loss of transformer and air gap space of motor, and the unbalanced rotating magnetic field from uni-direction phase chopping of SCR and on-off control of oscillator. The no load and full load condition is well satisfied by this techniques.
Stable Controller Design of MIMO Systems in Real Grassmann Space
김수운,김호찬,부창진,김신 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.2
A new design method of a stable dynamic output feedback (DOF) controller in linear MIMO systems is presented on the frame of real Grassmann spaces. For the analysis, the DOF systems are decomposed into augmented static output feedback (SOF) systems using signal flow graph analysis of all DOF loops. For synthesis and design, the characteristic polynomial of the augmented SOF system for the system’s stable poles and the sub-characteristic polynomial of the sub-SOF system for the controller’s stable poles are parametrized within their Grassmann invariants in real Grassmann spaces, whose coordinates are defined in the real coefficient function spaces of their augmented SOF variables. The numerical parametrization and computation algorithm for a stable controller design is illustrated over a MIMO plant of a practical aircraft carrier model.
相變換에 의한 三相誘導電動機의 1/3, 2/3 速度制御에 관한 연구
金樹運 울산대학교 1983 연구논문집 Vol.14 No.1
3상, 4극, 동기속도 1000rpm의 농형유도전동기가, 제3고조파 성분의 起磁力의 합성과 相變換에 의하여, 쉽게 1200, 600rpm의 동기속도로 변환될 수 있었다. 이 구동방법은 일반적인 3상농형유도전동기가 單相電源에 의해서 정격출력의 馬力수를 낼 수 있었다. 또한 권선형 유도전동기는 2차저항에 의하여 경부하에서 300~1,800rpm의 가변속도변화범위를 얻을 수 있었으며 극수변환법과 비교하여 여러 운전특성에 큰 장점을 갖고 있었다. The synchronous speed, 1800rpm, of the 3ø, 4pole, induction motor is easily converted to the 1200 and 600rpm by composition of the 3rd harmonic mmf(magnetomotive force)and phase conversion. This driving method makes it possible the 3ø, induction motor to be operated in the 1ø power source with the equivalent horse powers and rated phase currents. And the wound-rotor induction motor can be controlled to the variable wide speed ranges, 300~1,800rpm, by this operation, and have more advantages in some characteristics than conventional ople changing method.