• Title/Summary/Keyword: Response

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Prediction of the Exciting Force of Machine and the Vibration Response of Floor Using Transfer Function Method (전달함수법을 이용한 장비가진력과 바닥진동응답의 예측)

  • 김석홍;김준호;이홍기
    • Journal of KSNVE
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    • v.2 no.4
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    • pp.273-280
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    • 1992
  • The prediction of vibration response of floor is necessary in order to check whether the floor vibration level will satisfy the allowable vibration standard of precise machinery such as electronic microscopes in semiconductor manufacturing plant before the installation of various neighboring equipment facility. In conventional vibration isolation, we were mainly interested in minimization of vibration transmissibility and stabilization of vibration isolation system. But in order to predict vibration response of floor, it is necessary to know exciting force of equipment installed on the floor and the mobility of the floor. We measured the exciting force of the dropped mass assumed as equipment and the mobility of some practical building floor using large impact hammer. And from this we predicted the vibration response of floor on which the mass dropped. This predicted vibration response of floor is compared with measured vibration response. Through upper procedure, we examined the possibility of predicting vibration response of floor from the information of exciting force of equipment and the mobility of floor.

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Noise Criteria for the Calculation of Response Spectra (응답스펙트럼 계산을 위한 잡음기준)

  • 노명현;최강룡;윤철호
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2003.03a
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    • pp.238-246
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    • 2003
  • By using simulated ground motions, which is sum of earthquake signals and noise, we measured the distortion of response spectra due to noise. We found that the distortion is more closely related to the signal-to-noise (S/N) ratio of root-mean-square (RMS) measurement than that of conventional peak measurement. Given a S/M ratio, the distortion of absolute acceleration response spectra is independent on the earthquake magnitude, while that of relative displacement response spectra has a strong dependence on the earthquake magnitude. This means that, when we calculate response spectra from time histories, we can efficiently predict the distortion of acceleration response spectra simply by measuring the RMS SJN ratios, or the distortion of displacement response spectra by combining the RMS S/N ratios and the earthquake magnitudes.

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Study on Mathematical Modeling and Response Characteristics of High-speed Solenoid Valve for Aero-engine

  • Zhang, Xiaodong;Yang, Yutao
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.03a
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    • pp.80-83
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    • 2008
  • Because of its advantages of simple structure, fast response speed, strong anti-pollution ability and good stability, high-speed solenoid valve has been widely used in aeroengine control systems, and some performances of the aeroengine control systems were affected directly by the response speed of high-speed solenoid valve. For some two-position two-way highspeed solenoid cone-valve, the paper discusses the establishment of its mathematical model and analyses its response characteristics by simulation model which is run in simulink of Matlab. Further more, a backstepping and segmentation method is used in the research of response characteristics, and the method is proved to be an accurate, fast and new method to get the influences of parameters on the valve s response characteristics.

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Study on disaster response competencies of 119 EMTs (구급대원의 재난대응역량에 관한 연구)

  • Lee, Jeong-Hyeok;Lee, Kyoung-Youl
    • The Korean Journal of Emergency Medical Services
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    • v.22 no.3
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    • pp.55-66
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    • 2018
  • Purpose: This study was conducted to investigate the disaster response competencies of 119 emergency medical technicians (EMTs). Methods: The subjects of this study were 226 119 EMT's at the fire station located in G province. The questionnaire consisted of 5 sub-factors and 29 items for measuring disaster response competencies and the collected data were analyzed using SPSS program. Results: Disaster response competency comprising immediate response, patient triage, patient treatment, patient transport, and collaboration support were 3.48, 3.64, 3.52, 3.64, and 3.16, respectively. Advanced EMTs scored significantly higher in patient triage (p<.001), treatment (p<.001), and transport (p=.022) competency than basic EMTs. Conclusion: In order to improve disaster response competency, it is necessary not only to enhance individual ability but also to continue disaster management training with related organizations.

Analysis of Response Spectra using Microearthquakes of Southeastern Korean Peninsula (한반도 남동부 미소지진을 이용한 응답스펙트럼 분석)

  • 김연중
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2000.10a
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    • pp.27-32
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    • 2000
  • Microearthquake records with magnitude 2.6~3.1 recorded in the southeastern part of the Korean peninsula during 1994~1998 are analyzed. Total of 42 records consisted of 12 events instrumented at 7 stations. The response spectra with the above data shows that the frequency range of the dominant response is about 10~25Hz and are compared with the standard response spectrum. The result implies that the characteristics of the microearthquake ground motion differ from those of standard response spectrum presented in US NRC Reg. Guide 1.60 especially at higher frequencies.

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Nonlinear Response of Classical Dynamical Systems to Short Pulses

  • Dellago, Christoph;Mukamel, Shaul
    • Bulletin of the Korean Chemical Society
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    • v.24 no.8
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    • pp.1107-1110
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    • 2003
  • Valuable insight into the nonlinear dynamics of a system can be gleaned from its response to a single intense short pulse. We derive expressions for the corresponding nonlinear response functions and show that the fluctuation-dissipation theorem may be extended beyond the linear response limit to an arbitrary pulse intensity. As an illustrative example, we calculate response functions up to 11th order for the regular Lorentz gas in two dimensions.

Optimal Design for Locally Weighted Quasi-Likelihood Response Curve Estimator

  • Park, Dongryeon
    • Communications for Statistical Applications and Methods
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    • v.9 no.3
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    • pp.743-752
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    • 2002
  • The estimation of the response curve is the important problem in the quantal bioassay. When we estimate the response curve, we determine the design points in advance of the experiment. Then naturally we have a question of which design would be optimal. As a response curve estimator, locally weighted quasi-likelihood estimator has several more appealing features than the traditional nonparametric estimators. The optimal design density for the locally weighted quasi-likelihood estimator is derived and its ability both in theoretical and in empirical point of view are investigated.

A Study on Analysis of Frequency Response with Hydraulic Circuit Analysis Module (유압 회로 해석 모듈을 이용한 주파수 응답 해석에 관한 연구)

  • 전봉근;송창섭;이용주
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.581-584
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    • 1995
  • The frequency response of a electro-hydraulic servo(EHS) system is studied. The frequensy response characteristics of the EHS system obtained by linerization method, nonlinerar simulation method, and experimentation are compared ane another. It is found that the frequency response of the EHS is consistent when input signal applied is very small, but that is deviated as input signal becomes large.

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