• Title/Summary/Keyword: Vibration Control

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Establishment on Management Plan of Environmental Noise with Noise Map (소음지도를 활용한 환경소음 관리계획 수립)

  • Sun, Hyosung
    • Journal of Environmental Impact Assessment
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    • v.20 no.2
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    • pp.123-131
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    • 2011
  • The objective of this study is to prepare the effective management plan of environmental noise with a noise map, and the guideline on the management plan of environmental noise was suggested through the review of existing application examples. The management plan of environmental noise with a noise map includes the practical contents in the stages of subdivision of management areas, establishment of reduction measures, opinion collection, post investigation, and reformulation of management plan. First, the classification of management regions is performed considering the excess degree of noise standard and the facility type in the phase of subdivision of management areas. Second, the optimal management plan is established through the investigation of regional characteristics and various noise reduction measures in the phase of establishment of reduction measures, which includes the examination of noise reduction effects with a noise map and the budget planning with the costing of noise reduction measures. Third, the opinion survey with a local resident and a expert is carried out in order to prove the validity of the management plan in the phase of opinion collection, and the management plan is modified with gathered opinions. Fourth, the post examination plan with noise measurement is performed in order to verify the real effect of noise reduction measures according to the management plan in the phase of post investigation. Finally, the amendment of the management plan as well as the improvement of a noise map is carried out at a regular cycle in the phase of reformulation of management plan.

Seismic Design of Long Span Structures Based on Hysteric Energy Absorption Mechanism(1) (이력에너지흡수 원리를 이용한 대경간 구조물의 내진설계(1) -이선형 탄소성 이력거동에 의안 에너지 소산원리를 이용하는 방법-)

  • Cheong, Myung-Chae;Won, Sung-Dae
    • Journal of Korean Association for Spatial Structures
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    • v.10 no.1
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    • pp.85-93
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    • 2010
  • This paper suggests a vibration control method long span structures with trussed roof. Basic concept of this method is based on the energy absorption through hysteresis loop of an elasto-plastic element. This element is attached on the top of the column supporting the roof. Two different types of roofs and three of earthquake waves are used in the investigation. It shows that this is very efficient method to reduce the seismic energy of roof member transferred from the column.

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Defect Analysis of the SBR Wastewater Treatment Plant for Unmanned Automation Based on Time-series Data Mining (시계열 데이터 마이닝을 이용한 하수처리 연속 회분식 반응기 장비 진단)

  • Bae, Hyeon;Choi, Dae-Won;Cheon, Seong-Pyo;Kim, Sung-Shin;Kim, Ye-Jin
    • Journal of the Korean Institute of Intelligent Systems
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    • v.15 no.4
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    • pp.431-436
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    • 2005
  • This paper describes how to diagnose SBR plant equipment using time-series data mining. It shows the equipment diagnostics based upon vibration signals that are acquired front each device lot process control. Data transform techniques including two data preprocessing skills and data mining methods were employed in the data analysis. The proposed method is not only suitable for SBR equipment, but is also suitable for other Industrial devices. The experimental results performed on a lab-scale SBR plant show a good equip-ment-management performance.

Study on the Key Technologies for Performance and Operation of the High-Speed EMU (동력분산형 고속철도 차량성능 및 운용 기반기술 연구)

  • Song, Dahl-H.;Min, Kyung-H.
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1227-1232
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    • 2008
  • High-speed train of push-pull type called as G7 train has been developed and chosen as the model of KTX-II which will be operated on Honam Line nexr year. However, the EMU-type high-speed train appeared to be the recent trend that foreign markets have shown. Also, in the near future, a great number of new train sets are needed to accommodate the increased passengers in our country. Thus, development of the high-speed EMU was decided, planned, and started. In the development, included were almost all fundamental key technologies such as noise and vibration reduction in a passenger cabin, running characteristics, aerodynamic analysis, crashworthiness evaluation, EMI/EMC analysis, design of the cooling system for the propulsion control system, enhanced performance of transformer and switching converters, synchronous traction motor with permanent magnets, new design of front nose and ergonomic interiors, application of advanced information technology(IT) and smart sensors and the cost reduction of construction of railway bridges, etc. Each key technologies are carried out as sub-project independently but under the supervision of a project. The project will develop the high advanced level of technologies and provide necessary know-why's and support the team in charge of the development of the high-speed EMU, Hyundai Rotem Co. Ltd. The high-speed EMU will be successfully developed with the support of the project.

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Measurement of Nonlinear Time-variant Source Characteristics of Intake and Exhaust Systems in Fluid Machines

  • Jang Seung-Ho;Ih Jeong-Guon
    • The Journal of the Acoustical Society of Korea
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    • v.24 no.3E
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    • pp.87-89
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    • 2005
  • The acoustical sources of intake and exhaust systems in fluid machines are often characterized by the source impedance and strength using linear frequency-domain modeling. In the case of the sources which are nonlinear and time-variant, however, the source parameters were sometimes incorrectly obtained. In this paper, the source model and direct measurement technique are modified in order to evaluate the effect due to nonlinear and periodically time-varying source character as well as the linear property of the reflectivity of in-duct fluid machine source. With a priori known kinematical information of the source, the types of nonlinear time-variant terms can be presumed by a simple physical model, in which there is practically no restriction on the form of the model. The concept of source impedance can be extendable by introducing the linear frequency response function for each nonlinear or time-variant input. Extending the conventional method and adapting the reverse MISO technique, it is possible to develop a direct method that can deal with the nonlinear time-variant source parameters. The proposed direct method has a novel feature that there is no restriction on the probability or spectral natures of the excited sound pressure data. The present method is verified by the simulated measurements for simplified fluid machines. It is thought that the proposed method would be useful in predicting the insertion loss or the radiated sound level from intake or exhaust systems.

Design Alterations of a Grinder of Semiconductor Wafer for the Improved Stability (반도체 Wafer용 Grinder의 안정화 설계)

  • Kil, Sa Geun;Ro, Seung Hoon;Shin, Yun Ho;Kim, Young Jo;Kim, Geon Hyeong
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.1
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    • pp.91-96
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    • 2017
  • One of the most critical aspects of the modern semiconductor industry is the quality of wafer surface, the roughness of which is mostly caused by the ingot slicing. And the grinding is supposed to be the main process to reduce the surface roughness. The vibrations of the disc surface grinder are the major problem to effectively achieve the required surface quality. In this study, the structure of a disc surface grinder was analyzed through the experiment and the computer simulation to investigate the dynamic characteristics of the machine, and further to alter the design for the improved stability. The result of the study shows that simple design alterations without alternating main body can effectively suppress the vibrations of the machine.

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A Study on Design of Small Type Screw Decanter using Commercial Analysis Tool (상용해석 툴을 이용한 소형 스크류 디캔터의 설계에 관한 연구)

  • Kim, Y.S.;Kim, J.T.;Yang, S.Y.
    • Journal of Drive and Control
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    • v.11 no.4
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    • pp.46-52
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    • 2014
  • This study suggests a small-sized screw decanter specialized for dredging sites. Generally, conventional screw decanters are composed of a cylinder and a cone. However, the suggested screw decanter simply has a cone based on a cone-type bowl structure. In this research, a commercial analysis tool is used to establish an optimal design for the bowl and the screw conveyor. Moreover, the base frame, where the main bearings that support the spindle of the bowl and the screw conveyor are installed, is optimally designed considering the weight of the rotating body and the deflection caused by the high centrifugal force. Furthermore, the natural frequency range of the spinning body, the bowl and the screw conveyor, is applied to this base frame; it is designed not to correspond to the resonance frequency range and achieves stability as a result. This study suggests an optimal design for the rotating body and the base frame of a screw decanter considering its vibration characteristics. Such a design will prevent overuse of materials and help to reduce the weight and volume-and the price-of a screw decanter.

A simulation program practical use for an engineering improvement of the work-place (작업장의 공학적 개선을 위한 시뮬레이션 프로그램 활용)

  • Yang Hong Seok;Lee Kang bok;Youn Eui Sik;Kang Kyung Sik
    • Proceedings of the Safety Management and Science Conference
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    • 2005.05a
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    • pp.273-278
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    • 2005
  • Prescribed according to the occupational safety and health low noise measurement method was changed to personal sampling in the method to measure an area noise. Such method had the limit which did not evaluated characteristic of sound of occurrence and the place of origin. This study was performed to establish an engineering remedy of the work-place noise. The subject was a vibration control process of the place of business in Pusan. A simulation program applied for an engineering improvement of the work-place noise. The results were as follows: 1. An noise occurrence level of the work-place before improvement was $88^{\sim}97dB(A)$, We applied an improvement method to be established and were expected to $80^{\sim}119dB(A)$. 2. The level of the noise-distribution to appear in the place of origin of the work-place before improvement was $90^{\sim}93dB(A)$ but, We executed the simulation after applied an engineering remedy and predicted $80^{\sim}85dB(A)$. A result of the simulation blue part was changed mostly into the dark blue color. The results suggest that simulation program establishes an engineering remedy and is useful to the case to apply.

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Implementation of Low-Cost Baby Monitor for deaf and Visually Impaired Person (시각·청각장애인을 위한 저비용 베이비 모니터 구현)

  • Oh, Pa-Do;Kim, Hyeon-Hui;Lee, Boo-Hyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.159-162
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    • 2015
  • In this paper, implement a baby monitor using the arduino for deaf and Visually Impaired. The proposed baby monitors are divided into measuring part & transmit part and linked with the application. The measuring part consists of a sound volume sensor, a transmit part consists of a bluetooth module. The measuring part and transmit part are controlled by the Arduino board. Measure the value of the sound by the sound sensor and delivers value to the arduino board. The measured value is sent to the application by the bluetooth module of transmit part. The application determines the received value and control the smart phone, and outputs the light from the sound and vibration for the value. It showed that the proposed baby monitor and an application is correctly operating in accordance with the value.

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Study on the performance improvement of a Main Oxidizer shut-off Valve Using Computer Aided Structural Analysis (전산 구조해석을 이용한 산화제 개폐밸브 성능향상에 관한 연구)

  • Kim, Do-Hyung;Bae, Young-Woo;Hong, Moon-Geun;Yoo, Jae-Han;Kim, Eun-Soo;Jang, Ki-Won
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.111-114
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    • 2010
  • MOV(Main Oxidizer shut-off Valves) control the combustion of launch vehicle systems by the supply and the isolation of liquid oxygen to a main combustion chamber in launch vehicle systems. Moreover, the MOV should secure a constant flow rate of liquid oxygen for combustion instability in the steady operational state. To modify the middle flange and rip of inlet valve design by Computer Aided Structural Analysis for improvement of EM core functions. In result, it has been verified to improve performance of EM by tests.

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