• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.227-231
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• 2014

Underwater radiated noise is one of the vital factors in underwater weapon systems like submarine. A passive elastic mount is an effective reduction method for the vibration from a ship-board machinery transmitted to the hull which is radiated as noise outside the hull. A passive elastic mount shows the limitation on the vibration reduction and needs multi stage mounting system including double stage one to meet the required underwater radiated noise criteria. It is necessary for the multi stage mounting system to consider the large displacement in the underwater shock explosion. So it is difficult to apply the multi stage mounting system in submarine because of space limitation. Also recent navy sonar system are trying to have the capability to detect the ship-borne acoustic signals in the low frequency range. An alternative to the passive mount is an active mount with moving-coil type electromagnetic actuator based on a conventional rubber mount in the low frequency range. In the previous paper, 4 active mounts with moving-coil type electromagnetic actuator based on the rubber mount were installed on the hard floor of the facility, which means no consideration on the elastic foundation effect for the control of the active mounts was taken into account. In this study, an experimental performance analysis on the active mount was carried out using 4 active mounts installed on the cylindrical structure to investigate the elastic foundation effect.

• 한국소음진동공학회논문집
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• 제23권10호
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• pp.885-894
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• 2013

이 연구에서는 함정탑재 장비의 진동으로부터 기인되는 고체음의 저감을 목표로 새로운 형태의 복합형 마운트를 개발하였다. 수동형 마운트와 비접촉식 전자기식 작동기 또는 관성력형 작동기로 구성된 복합형 마운트가 우수한 성능을 보유한다는 선행연구 결과를 바탕으로 이 연구에서 개발된 복합형 마운트는 기존의 검증된 수동형 고무마운트와 전자기식 작동기를 비접촉식으로 결합한 형태이며, 내충격 성능을 고려하여 설계하였다. 먼저 장비로부터 유발된 진동이 외부로 전달되는 성분의 차단에 대해 복합형 마운트의 효과적인 구성요소 배치형식을 제안하였으며, 여러 설계인자를 고려한 초기 설계안을 제시하고, 마운트 설치 시 문제원인이 될 수 있는 내충격 성능을 고려한 최종 설계를 수행하였다. 설계된 복합형 마운트를 제작하고, 실험을 통해 성능을 검토하였다.

• 대한기계학회논문집A
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• 제40권1호
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• pp.17-22
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• 2016

바코드 리더를 위한 전자기력을 이용한 소형 회전 무빙 코일 타입 보이스 코일 구동기를 개발하였다. 본 구동기는 1 개의 자석과 1 개의 코일 그리고 1 개의 복원핀으로 이루어진 간단한 구조이다. 구동기는 DC 모터의 선형으로 근사화한 이론적인 모델링으로 해석하고, 유한 요소 해석 프로그램으로 모터 상수와 복원력 상수를 계산하여 동적 성능을 예측하였다. 공진 주파수는 64 Hz 이며 바코드 리더를 위한 50 Hz 의 주파수에서 60 deg 의 반사각을 가짐으로 예측되었다. 시작품을 제작하여 실험을 통하여 3 V 의 입력 전압에서 50 Hz 의 주파수에서 61.8 deg 의 반사각을 가짐을 확인하였다. 제안된 구동기는 Op-amp 를 이용하여 간단한 개루프 제어 회로 구성이 가능하다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.1033-1036
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• 2007

The optical disc drive has used a high NA objective lens and a shorter wavelength laser diode for high recording density. But high NA and shorter wavelength cause several margins to become short. Focusing and tracking servo has to be more accurate and active tilt compensation mechanism is also needed for coma aberration compensation. In this paper, we proposed 3-axis moving magnet type actuator. For 3-DOF motion, moving coil actuator has to equip 6 wires for supplying 3 independent signals. However, moving magnet type actuator doesn't need to change the configuration of wires because coils are in stator. So, we added tilting mechanism to 2-axis moving magnet actuator which is designed in previous research. Addition of the tilting mechanism cuts down the focusing sensitivity. So, maximization the tilting sensitivity and securing the focusing sensitivity are objectivities of this research. DOE (design of experiments) procedures of electromagnetic circuit are performed for parameter study and the optimization is also performed to maximize the tilt sensitivity. And then the final design is suggested and its performance is verified by FE simulation.

• 정보저장시스템학회논문집
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• 제3권4호
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• pp.191-195
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• 2007

The optical disc drive has used a high NA objective lens and a shorter wavelength laser diode for high recording density. But high NA and shorter wavelength cause several margins to become short. Focusing and tracking servo has to be more accurate and active tilt compensation mechanism is also needed for coma aberration compensation. In this paper, we proposed 3-axis moving magnet type actuator. For 3-DOF motion, moving coil actuator has to be equipped with 6 wires for supplying 3 independent signals. However, moving magnet type actuator doesn't need to change the configuration of wires because coils are in stator. So, we added a tilt mechanism to the 2-axis moving magnet actuator which is designed in previous research. Addition of the tilt mechanism cuts down the focus sensitivity. So, maximization the tilting sensitivity and securing the focusing sensitivity are objectivities of this research. DOE (design of experiments) procedures of electromagnetic circuit are performed for parameter study and the optimization is also performed to maximize the tilt sensitivity. And then the final design is suggested and its performance is verified by FE simulation.

• 대한기계학회논문집A
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• 제25권8호
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• pp.1308-1316
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• 2001

A hybrid type master system is proposed to take the advantage of the link mechanism and magnetic levitation mechanism without using a force sensor. Two different types of electromagnetic actuators, moving coil type and moving magnet types are used to drive the master system which is capable of 4-DOF actuation. It is designed that the rotation motions about x-y axis are decoupled and the whole system is represented by simple dynamic equations. The force reflection is achieved by using the simple relation between the force and applied current and position. The simulation and experimental results are presented to show its performance.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계학술대회논문집
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• pp.750-755
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• 2005

This paper proposes a small VCM (Voice coil motor) type actuator using curved suspensions for auto-focusing and zoom motions for mobile information devices. 1'he proposed focusing actuator adopts a nontraditional type of suspension using curved beams in order to extend output displacement within small height restriction. The curved beam is similar to the leaf spring type which is usually used in optical disk drives. In addition, three different materials are considered for the curved suspension model, and Aluminum shows the best dynamic characteristics. The proposed zoom actuator does not use a suspension supporting bobbin but a moving rail and a sloper mechanism by generating rotational force at lens holder. The sensitivity of design parameters on output performance is studied using ANSYS (3D FEM tool). Experiments using a prototype of the proposed actuator model verified the analytical prediction and performance.

• 한국소음진동공학회논문집
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• 제15권3호
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• pp.334-340
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• 2005

A disk-type 3-DOF actuator which has new principle and very simple structure is proposed. Also it utilizes the relation of bias and control fluxes produced by permanent magnets and coils, respectively, like other conventional electromagnetic actuators, but its main feature is that both the coils and permanent magnets are fixed in the stator, which makes it easy to design the shape of moving part. Operating principle is that a moving disk is driven by reaction force of Lorentz force acting on the fixed equivalent coil. Simple analytic approach and FEM analysis are performed to determine the design parameters so as to increase the driving force and distance. And some experimental results show the feasibility of the proposed actuator.

• 대한기계학회논문집A
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• 제37권12호
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• pp.1529-1534
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• 2013

전자기력을 이용한 소형 회전 무빙 자석 타입 보이스 코일 구동기를 소형 이동 로봇을 위해 개발하였다. 1개의 자석과 1개의 코일 그리고 1개의 요크로 이루어진 간단한 구조이다. DC 모터와 같이 선형으로 근사화한 이론적인 모델링으로 성능을 예측하였고, 유한 요소 해석 프로그램으로 모터 상수와 복원력 상수를 계산하여 자석과 코일 사이의 공극에 따른 성능을 예측하였다. 시작품을 제작하여 실험을 통하여 60Hz 에서 공진 주파수를 가지고 주파수 대역폭이 80Hz를 가짐을 확인하여 모델링을 검증하였다. 그리고 정적으로 1.5V 입력 전압으로 약 20 deg의 회전을 확인하였다. 제안된 구동기는 개루프 제어가 가능하여 회로 구성을 간단히 할 수 있다.

• 한국소음진동공학회논문집
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• 제18권1호
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• pp.11-19
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• 2008

This paper proposes small VCM(voice coil motor) type, auto-focusing and zoom actuators for mobile information devices. In order to meet the large output displacement within small height restriction, the proposed auto-focusing actuator adopts curved suspensions, which are similar to a leaf-spring type suspension of optical disk drives. The sensitivity of design parameters on output displacement and dynamic performance is implemented using ANSYS (3D FEM tool) to determine the optimal geometry and stiffness of the curved suspensions. This paper also investigates a new zoom actuator without a suspension supporting a bobbin. The zoom actuator uses a moving rail and a stoper mechanism by generating rotational force at lens holder. Magnetic flux density of the zoom actuator are calculated by both the FEM and permeance method. Experiments using prototypes of the proposed focusing and zoom models show that both actuators meet the required displacement and performance.