• 소음진동
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• 제7권1호
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• pp.81-89
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• 1997

The structural stress and vibration analysis of the rotary screen are investigated. The mechanical properties of the rotary screen, this is, Young's modulus and density of nickel alloy are determined experimentally. The natural vibration characteristics of the rotary screen are evaluated and the displacement, the stress of the rotary screen under the various load conditions are also examined. The radial displacement of the rotary screen is obtained by experiment under various rotating speeds.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2013년도 춘계학술대회 논문집
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• pp.1337-1338
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• 2013

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1057-1062
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• 2007

The purpose of this study is to find out design parameters of vibrating screen, such as particles motion, specific gravity, shape, and kinetic friction. In order to approach this problem, four materials of construction wastes, wood, styrofoam, concrete, and sand are used for dynamic modeling. To present friction between the particles material and tilt plates material, these particles model is applied in order to verify effectively. Generally, the vibrating screen is composed of three assemblies such as screen, wastes guide, supported of screen. This model regards vibrator as system of screen fixed tilt plates. The model is analyzed to present what kind of particles motion while the system is vibrating. and this vibration system has been implemented in a ADAMS dynamaic program. This modeling is consist of dynamic model separation state on particle size. This study make good technique to verify in theory.

• 한국생산제조학회지
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• 제22권5호
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• pp.886-893
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• 2013

A vibrating screen with multiple decks is widely employed for the process separation of many valuable export commodities. In this study, the inclination angle of the deck of the vibrating screen and the direction angle of the screen's vibration under single particle kinematics were predicted. A finite element model of the vibrating screen was established by parameterization modeling. Through modal analysis and static analysis of the model, the natural frequency, natural vibration mode, and stress distribution of the structure were determined, based on which the dynamics and design optimization of the vibrating screen could be achieved. Future plans also reflect this by conducting detailed design of vibrating screens for the manufacturing plans of vibrating screen machine.

• 설비공학논문집
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• 제20권8호
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• pp.526-533
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• 2008

In this study, theoretical super screen vibration analysis has been carried out to predict the dynamic characteristics of interactive waste particles. In order to approach these problems, it is necessary to have a fundamental understanding the screening process and the process of both the remaining and the passed material on a screen with several interacting screen planes based on Soldinger(1999) was discussed. Here, the vibrating screen is composed of three assemblies such as screen, wastes guide, and supported screen as shown in Fig. 1. This model is regarded vibrator as the system of screen fixed tilt plates. Then materials(or particles) of different size is to be separated by using the eccentric vibrator and classifying tilt plates. As well moisturized construction wastes is more efficient to separate than moisture-less it. In processing separate mechanism, the more materials is light, the more staying time is long. Thus much lighter construction wastes(wood, Styrofoam, etc) and heavier materials are separated by staying time delay in a super screen. The design results, separation screen were able to know that small and larger particles are conspicuous difference each motion character according to trajectory particles, and small particles raise the probability in classifying tilt plates.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2005년도 춘계학술대회 논문집
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• pp.305-309
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• 2005

고액분리기란 고형물을 함유한 폐수로부터 고체와 액체를 분리하는 장치로서, 수산가공폐기물, 축산분뇨 등과 같은 폐수의 효가적인 처리를 위해서는 고형물을 걸러내는 전처리 공정이 반드시 필요하다. 현재 많이 활용하고 있는 고액분리장치로는 경사스크린식, 드럼스크린식 등이 있으며, 이러한 방식은 고액분리 효율이 낮고 빈번히 발생하는 스크린의 눈막힘 현상 때문에 분리도중에 역세청 등의 부가적인 과정이 필요하다. 본 논문에서는 기존의 진동 고액분리장치에서의 주된 문제점인 스크린의 눈막힘 현상을 해소하고, 최적의 고액분리효율을 얻기 위한 스크린구조, 가진구조와 방법, 진동주파수설정 등을 연구하고, 마이크로프로세서를 이용한 고액분리 자동화장치를 개발하고자 하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.865-868
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• 2005

A Helmholtz resonator is one of noise control elements widely used in many practical applications. The resonator has very high absorption at resonance frequency but the frequency bandwidth is very small. Therefore many kinds of additional resistive screens have been applied to the resonator's neck in order to increase the bandwidth. This paper discusses the absorptive characteristics of a Helmholtz resonator damped by a flexible porous screen in form of wire mesh. First, various experimental results are introduced and studied. Secondly, the effect of the resistive screen is theoretically predicted. It is shown that the distance between the screen and aperture affects on the resonance frequency as well as the absorption of the system.

• 한국항해항만학회지
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• 제33권1호
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• pp.57-63
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• 2009

수산폐기물을 방류기준에 맞추어 효과적으로 분리 처리하기 위하여, 고형물을 함유한 폐수로부터 고체와 액체를 분리해내는 전처리 공정이 필요하다. 또한, 전처리 공정효율이 극대화될수록 후속처리공정의 처리용량향상, 처리시설 규모축소, 경비절감 등의 효과도 커진다. 이를 위해 이 논문에서는 진동형 역경사식 스크린 기술을 제안하고, 최적의 고액분리를 위해 적정 진동주파수 및 기진각을 검출하였다. 진동발생기는 스크린 몸체에 대해 일정한 각도($0^{\circ}$,$30^{\circ}$,$45^{\circ}$,$90^{\circ}$)로 각각 두었으며, 진동주파수는 진동에 의한 스크린의 손상을 고려하여 35-60Hz 범위 내에서 5Hz 단위로 가변하면서 고액분리효율을 측정하였다. 스크린 경사각은 예비실험을 통해 $3^{\circ}{\sim}5^{\circ}$로 설정하고, 여과장치는 직사각형과 정사각형 2종류로 제작하였다. 실험결과 장치의 형태와 관계없이 대체적으로 $0^{\circ}$의 기진각과 60Hz의 진동주파수에서 우수한 여과효율이 나타났다. 그리고 여과 전후의 부유물질(SS)의 양을 비교하여 제안한 기술의 유효성을 검증하였다.

• Wind and Structures
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• 제36권2호
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• pp.91-103
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• 2023

Tuned liquid dampers (TLDs) are increasingly being used as efficient dynamic vibration absorbers to mitigate wind-induced vibration in super high-rise buildings. However, the damping characteristics of screens and the control effectiveness of actual structures must be investigated to improve the reliability of TLDs in engineering applications. In this study, a numerical TLD model is developed using computational fluid dynamics (CFD) and a simulation method for achieving the coupled vibration of the structure and TLD is proposed. The numerical results are verified using shaking table tests, and the effects of the solidity ratio and screen position on the TLD damping ratios are investigated. The TLD control effectiveness is obtained by simulating the wind-induced vibration response of a full-scale structure-TLD system to determine the optimal screen solidity ratio. The effects of the structural frequency, damping ratio, and wind load amplitude on the TLD performance are further analyzed. The TLD damping ratio increases nonlinearly with the solidity ratio, and it increases with the screens towards the tank center and then decreases slightly owing to the hydrodynamic interaction between screens. Full-scale coupled simulations demonstrated that the optimal TLD control effectiveness was achieved when the solidity ratio was 0.46. In addition, structural frequency shifts can significantly weaken the TLD performance. The control effectiveness decreases with an increase in the structural damping ratio, and is insensitive to the wind load amplitude within a certain range, implying that the TLD has a stable damping performance over a range of wind speed variations.

• 한국소음진동공학회논문집
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• 제22권7호
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• pp.599-604
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• 2012

In this study, the safety of the driving gear reducer of ESW(essential service water) traveling sea water screen was evaluated through seismic analysis. Mode analysis of gear reducer was performed for reliability of analysis. Seismic analysis was performed in operating basis earthquake(OBE) and safe shutdown earthquake(SSE), which were applied as design condition using floor response spectrum( FRS). The maximum strain of gear reducer under OBE and SSE were 20.4 ${\mu}$ and 33.6 ${\mu}$, respectively. The maximum stresses were 2.42 MPa under OBE condition and 4.36 MPa under SSE condition, which were smaller than the allowable strength of material.