• 한국산학기술학회논문지
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• 제20권8호
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• pp.642-648
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• 2019

본 논문은 스낵식품 가공 공정라인에서 사용하는 설비 중 하나로 이송물의 관성을 이용한 제조공정용 Fast Back 이송장치이다. 기존의 이송 장치는 벨트 컨베이어와 기계식 크랭크를 적용한 구동 장치로써 소음과 진동이 크고 환경 공해 발생하며 주기적인 유지보수가 필요하다. 이로 인해 본 논문에서는 제안하는 Fast Back 이송 장치는 크랭크식 구동장치 부분을 리니어 서보모터로 대체하고 가속에 따른 힘의 평형을 맞추기 위한 평형추 장치를 적용하여 안정된 동작을 확보하였다. 평형추 장치는 주기적으로 발생하는 충격형태의 가진력을 상쇄 시키는 것으로 진동해석을 통해 진동의 주요 원인을 파악하고 저감대책을 수립하였다. 시제품 제작을 통한 진동시험에서 약 10배 정도의 진동 저감에 대한 유효성을 검증하였다. 또한, PLC제어를 통한 전진과 후진에서의 속도, 가속도 조정을 가능하게 설계함으로써 직선형 구동력을 직접 발생시켜 별도의 기계적 변환장치가 필요하지 않아 에너지 손실이나 소음 및 진동을 발생시키지 않고 운전 속도에도 제한을 받지 않음을 증명하였다.

• 한국소음진동공학회논문집
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• 제21권3호
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• pp.258-263
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• 2011

The direction of the cutting tool plays a critical role in elliptical vibration cutting(EVC) where the cutting tool cuts workpiece in a trochoidal motion. In this study, EVC cutting device was developed using two parallel piezoelectric materials and it was observed that the rotation direction of the tool reverses as the EVC device undergoes resonance at which either flexural(cutting direction) or longitudinal( thrust direction) mode shapes occurs. To analytically explain reversal of the rotation direction, kinematic motion analysis of the tool was modified to incorporate amplification of the vibration amplitude and phase introduced by resonance. It successfully demonstrated, through Matlab simulation, reversal of the rotation direction of the cutting tool as the excitation frequency increases beyond resonance frequencies at which either flexural or longitudinal vibration occurs.

• 한국소음진동공학회논문집
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• 제21권11호
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• pp.991-996
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• 2011

This study was carried out vibration attenuation of vibration absorber attached to the cantilever beam structure. Modern tank guns are stabilized to allow fire on the move while traversing uneven terrain. However, as the length of the barrel is extended, to meet required muzzle exit velocities, the terrain induced vibrations lead to increased muzzle pointing errors. Thus, reducing these vibrations should lead to increased accuracy. The vibration absorber includes a compliant energy storage device, such as a spring, and a mass secured to the energy storage device. In this study, it accomplished a research in about gun barrel vibration attenuation using tuned mass damper. The barrel was hung from a bungee cord for free-free condition. It accomplished a vibration experiment for verified attenuation efficiency.

• 한국소음진동공학회논문집
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• 제15권5호
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• pp.578-585
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• 2005

In this paper, we present a schematic method estimating the tracking vibration quantity occurring in the track-following system of an optical recording device. A tracking loop gain adjustment algorithm is introduced to estimate accurately the tracking vibration quantity in spite of the uncertainties of the tracking actuator, Accordingly, the tracking vibration quantity can be estimated from the tracking error, the controller output, the nominal actuator model, and a compensated gain. An optimal tracking controller can be designed from a minimum tracking open-loop gain calculated by the estimated tracking vibration quantity The proposed vibration quantity estimation and controller design method are applied to the track-following system of an optical recording device and are evaluated through the experimental result.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.1038-1042
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• 2003

In order to evaluate dynamic impedance of a hand-arm system it is necessary to measure the hand-transmitted vibration and the reaction force at the same time while gripping the vibrating handle. In the study a device was developed to measure both the vibration and the force. The device consists of a measurement handle with four strain gauge and two accelerometers and a PC based control system with a program for the signal processing and evaluation of the hand-transmitted vibration and reaction force. The handle was installed on the vibration shaker so that it can move by the generated signal from the control system. As an application of the system dynamic reaction force and the frequency weighted acceleration at the handle attached to the shaker were measured at various grip force and feed force. This system will be very useful in the area of impedance measurement and the evaluation of performance of anti-vibration gloves.

• 한국전자통신학회논문지
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• 제12권2호
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• pp.361-366
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• 2017

산업체 전반의 주요 설비에서 이상 상태는 온도의 이상 상승, 진동과 소음의 변화를 수반하여 나타나게 된다. 본 연구에서는 BLE 를 탑재한 스마트 센싱 모듈를 개발하고, MEMS 기반의 가속도 센서를 인터페이스하여, 설비의 자체결함으로 인한 이상진동을 감지할 수 있는 스마트 센싱 디바이스를 개발하였다. 본 연구에서 개발한 스마트 센싱장치는 좁은 공간에 쉽게 설치하여, 설비의 진동상태를 실시간으로 모니터링 할 수 있으며, 어레이 LED 디스플레이로 정상상태와 문제 발생상태를 간편하게 사용자에게 알려줄 수 있다.

• 대한의용생체공학회:의공학회지
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• 제40권6호
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• pp.235-241
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• 2019

The purpose of this study was to investigate the effect of the body temperature peripheral circulation with vibration shoes in healthy 10 adults. The magnetic vibration device with non-electric power was mounted in the midsole of the vibration shoes. The experiment was divided into two groups: vibration shoes and no vibration shoes. Subjects were randomly selected and measured body surface temperature by digital infrared thermal imaging (DITI) and non-invasive capillaries change by nailfold microscope (NFM). After walking in a treadmill for 15 minutes at 4.0 km/h speed wearing normal shoes or vibration shoes, DITI and NFM were measured. The walking with vibration shoes showed the body surface temperature shift from the proximal to the distal. In addition, the diameter of the nailfold capillary in the vibration shoes group was thicker and clearer due to the increased blood flow than that of the no vibration shoes group. The vibration shoes are easy to apply to anyone who can walk because it can give vibration stimulation by walking without additional time, cost, and effort in daily life. Further studies are needed to explain the physiological effects of vibration frequency and intensity on the long-term perspective of target subjects resulting from vascular dysfunction.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1242-1247
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• 2011

This study investigates vertical vibration control method for railway structure by using vertical vibration control device. The device consists of high stiffness polyurethane spring and friction damper recognized by National Center for Earthquake Engineering Research of USA for durability. To confirm the capacity of vertical vibration control, at first, behavior equation is established by considering correlation among the components. Then, hysteresis curve is drawed from behavior equation. By considering both dynamic behaviors and material nonlinearities, more reasonable behavior of the device can be simulated. After that, the Validity of the vibration control trend is proved by FEM(Finite Element Method).

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.544-549
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• 2001

The effect of power supply voltage on the performance limits in a laboratory Magneto-rheological fluid based device was identified by experiments. It suggests that the frequency range of motion for control be limited by the voltage attenuation due to the coil inductance and the maximum power supply voltage set for practical use of MRF devices. In this work, the magnetic and electrical characteristics of MRF device are investigated and a design procedure is formulated to achieve the desired performance for a given power supply.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.142-147
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• 2003

This paper is concerned with the experiment of vibration isolation device whit can cope with heave, pitch and roll type vibrations. This new device consists of S-shaped piezoceramic actuators supporting each corner of the plate. Small piezoceramic sensors are located at the middle of each side. This paper also presents the development and the movement of the system. The active control technique was also developed to cope with base excitation. Experimental results show that vibrations can be reduced by the new device in the case of base excitation of harmonic type.