• Title/Summary/Keyword: Frequency response characteristics

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VPI Varnishing Technology Effects on Frequency Characteristics of an Air Core Inductor Used in LISN Circuit Application

  • Kanzi, Khalil;Kanzi, Majid;Nafissi, Hamidreza
    • Journal of international Conference on Electrical Machines and Systems
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    • v.2 no.1
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    • pp.57-64
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    • 2013
  • The functional characteristic of LISN circuit, which is used for measurements of conductive noise in mains power line, is basically related to frequency characteristics of passive elements like inductors used in the circuit as well as the frequency response of inductors is highly related to the resins used in the varnishing process. The significant problem in determination of an inductor's frequency characteristic is the intrinsic resistance, inductance and parasitic capacitance. In this triplet, the parasitic capacitance is the major limiting factor of inductor's frequency range. This capacitance depends on inductor design parameters and materials filling the spaces of coil like resin and its coherency after curing process. In this paper, two similar inductors were designed and built. The first inductor was not varnished while the second one was varnished with VPI technology. VPI, or Vacuum, Pressure, Impregnation technology is one of the most reliable methods performing good insulating conditions for electrical circuits and windings based on resins. The measured results show that implying varnishing technology does not significantly affect the frequency response. However, due to mechanical solidity aspects and improved environmental protection, it is better to varnish the inductors.

Approximate Equivalent-Circuit Modeling and Analysis of Type-II Resonant Immittance Converters

  • Borage, Mangesh;Nagesh, K.V.;Bhatia, M.S.;Tiwari, Sunil
    • Journal of Power Electronics
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    • v.12 no.2
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    • pp.317-325
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    • 2012
  • Resonant immittance converter (RIC) topologies can transform a current source into a voltage source (Type-I RICs) and vice versa (Type-II RICs), thereby making them suitable for many power electronics applications. RICs are operated at a fixed frequency where the resonant immittance network (RIN) exhibits immittance conversion characteristics. It is observed that the low-frequency response of Type-II RINs is relatively flat and that the state variables associated with Type-II RINs affect the response only at the high frequencies in the vicinity of the switching frequency. The overall response of a Type-II RIC is thus dominated by the filter response, which is particularly important for the controller design. Therefore, an approximate equivalent circuit model and a small-signal model of Type-II RICs are proposed in this paper, neglecting the high-frequency response of Type-II RINs. While the proposed models greatly simplify and speed-up the analysis, it adequately predicts the open-loop transient and small-signal ac behavior of Type-II RICs. The validity of the proposed models is confirmed by comparisons of their results with those obtained from a cycle-by-cycle simulation and with an experimental prototype.

Dynamic Pyroelectric Properties and Their Frequency Dependences of $Pb(Zr_xTi_{1-x})O_3$ Ceramics with Various Compositions (성분에 따른 $Pb(Zr_xTi_{1-x})O_3$세라믹스의 Dynamic 초전 특성과 그 주파수 의존성)

  • 민경진;윤영섭
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.609-612
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    • 1998
  • Pyroelectric properties of rhombohedral $Pb(ZrxTi_1-x)O_3ceramics$ with various Zr/Ti ratios of 84/16, 87/13, 90/10, and 93/7 are investigated using dynamic method. The response characteristics of PZT samples are examined by considering frequency dispersion. Since the reorientation of the grain does not the influence on the increase of frequency at low frequency (2~200Hz), the maximum pyroelectric response can be obtained with the change of spontaneous polarization. However, the pyroelectric response of PZT samples could be reduced as the spontaneous polarization decreases due to the restrain of the reorientation of the grain with the increasing of requency at high frequency (200~2000Hz). We have obtained the good pyroelectric response in the PZT sample having 84/16 Zr/Ti ratio, then the pyroelectric coefficient (${\gamma}$) and the figure of merit (FV) were $17.3nC/\textrm{cm}^2K$ and 2.28$\times$10-11Ccm/J, respectively. The noise equivalent power (NEP), the detectivity (D*) were 1.21$\times$10-7W/Hz$\frac{1}{2}$ and 8.26$\times$106cmHz$\frac{1}{2}$/W, respectively.

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The Acceleration Response Spectrum for Simulated Strong Motions Considering the Earthquake Characteristics of the Korean Peninsula (한반도 지진특성을 고려하여 모사된 강진동에 대한 가속도 응답스펙트럼)

  • Kim, Sung-Kyun
    • Journal of the Korean earth science society
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    • v.28 no.2
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    • pp.179-186
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    • 2007
  • The response spectrum is one of the important basic materials for the aseismic design. Numerous strong ground motions based on the seismic source characteristics for the earthquakes occurring in the Korean Peninsula were simulated to obtain the response spectra by using the computer program, SMSIM, developed by Boore (2005). Through the extensive review of other study outcomes, the input data for the simulation such as seismic source and attenuation characteristics were selected. The spectra obtained from the simulated ground motions were normalized to 1.0 g of zero period acceleration and compared with the standard response spectrum proposed by the U.S. Atomic Energy Commission (AEC, 1973). In this study, we found that the spectral values for the response spectra appeared to be larger than those of the standard spectrum in the frequency band above roughly 10 Hz. The variation of resulting response spectra was evaluated with the variable stress drops. It was shown that the spectral amplitude of the spectrum for the larger stress drop denotes higher value in the low frequency range.

The Measurement Algorithm for Microphone's Frequency Character Response Using OATSP (OATSP를 이용한 마이크로폰의 주파수 특성 응답 측정 알고리즘)

  • Park, Byoung-Uk;Kim, Hack-Yoon
    • The Journal of the Acoustical Society of Korea
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    • v.26 no.2
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    • pp.61-68
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    • 2007
  • The frequency response of a microphone, which indicates the frequency range that a microphone can output within the approved level, is one of the most significant standards used to measure the characteristics of a microphone. At present, conventional methods of measuring the frequency response are complicated and involve the use of expensive equipment. To complement the disadvantages, this paper suggests a new algorithm that can measure the frequency response of a microphone in a simple manner. The algorithm suggested in this paper generates the Optimized Aoshima's Time Stretched Pulse(OATSP) signal from a computer via a standard speaker and measures the impulse response of a microphone by convolution the inverse OATSP signal and the received by the microphone to be measured. Then, the frequency response of the microphone to be measured is calculated using the signals. The performance test for the algorithm suggested in the study was conducted through a comparative analysis of the frequency response data and the measures of frequency response of the microphone measured by the algorithm. It proved that the algorithm is suitable for measuring the frequency response of a microphone, and that despite a few errors they are all within the error tolerance.

Nonlinear Response Characteristics of the ISSC TLP in Time Domain (시간영역에서 ISSC TLP의 비선형 응답 특성)

  • Lee, Chang-Ho
    • Journal of Ocean Engineering and Technology
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    • v.20 no.5 s.72
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    • pp.30-35
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    • 2006
  • In tire presence of incident waves with different frequencies, there are second order sum and difference frequency wave exciting forces due to the nonlinearity of tire incident waves. Although the magnitude of these nonlinear wave forces are small, they act on TLPs at sum and difference frequencies away from those of the incident waves. So, the second order sum and difference frequency waveexciting forces occurring close to tire natural frequencies of TLPs often give greater contributions to high and law frequency resonant responses. Nonlinear motion responses and tension variations in the time domain are analyzed by solving the motion equations with nonlinear wave exciting forces using tire numerical analysismethod. The numerical results of time domain analysis for the nonlinear wave exciting forces on the ISSC TLP in regular waves are compared with the numerical and experimental ones of frequency domain analysis. The results of this comparison confirmed tire validity of the proposed approach.

Response Characteristics Of Steel Frame Structuresw With Added Elastic Dampers (탄성 댐퍼가 추가된 대형철골 구조물의 응답특성)

  • Bae, Chun-Hee;Cho, Cheul-Whan;Yang, Kyeong-Hyeon;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.593-598
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    • 2002
  • Coupling adjacent steel frame using elastic dampers for control of response to low and moderate dynamic event is investigated in this paper. The complex modal superposition method is first used to determine dynamic characteristic, mainly modal damping ratio and modal frequency, of damper linked linear adjacent steel frame for fractical use. Dynamic response of steel frame linked by hydraulic-excitation method. This combined method can efectively and accurately determine dynamic response of non-clasically damped systems in the frequency domain. Parametric studties are finally performed to identify optimal parameters of elastic dampers for achieving the maximum modal damping ratio or the maximum response reduction of steel frame. It is demonstrated that using discrete elasatic dampers of proper parameters to link steel frame can reduce dynamic response significantly.

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Analysis of Transient Response of an Engine to Throttle Tip-in/Tip-out (차량 감/가속시의 엔진의 동적 응답 해석)

  • 고강호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.4
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    • pp.122-128
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    • 2002
  • In this paper dynamic responses of an engine, which is supported by hydraulic mount, to throttle tip-in/Tip out are analyzed. Because the hydraulic mounts have non-linearity that the characteristics of stiffness and damping vary with frequencies, it is difficult to analyze the dynamic behavior of an engine using general integral algorithms. Convolution integral and relationship between unit impulse response functions and frequency response functions are therefore used to simulate the transient behaviors of an engine indirectly. In time domain, impulse response functions are calculated by two-side discrete inverse courier transform of frequency response function achieved by laplace transform of equations of motion. Considering the fact that the shapes of behavior of an engine simulated by the proposed method are in good agreement with test results, it is confirmed that the proposed method is very effective for the analysis of transient response to throttle tip-in/out of an engine with hydraulic mounts.

Dynamic Analysis of Engine Response to Throttle Tip-in/Tip-out (Tip-in/Tip-out 시의 엔진의 동적 거동 해석)

  • Ko, Kang-Ho;Kook, Hyung-Seok
    • Proceedings of the KSME Conference
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    • 2001.06b
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    • pp.540-545
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    • 2001
  • In this paper dynamic responses of an engine, which is supported by hydraulic mount, to throttle tip-in/tip out are analyzed. Because the hydraulic mounts have non-linearity which the characteristics of stiffness and damping vary with frequencies, it is difficult to analyze the dynamic behavior of an engine using general integral algorithms. Convolution integrals and relationships between unit impulse response functions and frequency response functions are therefore used to simulate the transient behavior of an engine indirectly. In time domain, impulse response functions are calculated by two-side discrete inverse Fourier transform of frequency response function achieved by Laplace transform of equations of motion. Considering the fact that the shapes of behavior of an engine simulated by the proposed method are in good agreement with test results, it is confirmed that the proposed method is very effective for the analysis of transient response to throttle tip-in/out of an engine with hydraulic mounts.

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Characteristics of transmission control of an AMT vehicle (AMT 차량의 변속제어 특성에 관한 연구)

  • Kong Jin-Young;Song Chang-Seop
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.3 s.180
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    • pp.86-93
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    • 2006
  • This study is concerned with the investigation of characteristics of an AMT (Automated Manual Transmission) which are composed of clutch part and transmission part. When a shilling signal is received from the controller, the clutch is disengaged first, and shifting action including selecting action is followed, and then the clutch is engaged last. The characteristics of transmission shifting response are affected by various parameters of clutch and transmission control elements. Analytical results are in fair agreement with experimental results. It is found that the operating pressure level is the most important for the response of AMT characteristics, and that the other parameters such as natural frequency and damping ratio of the control valve are less important.