Drei-Bode-Plots-Verfahren für Regelungstechnik

2020 ◽  
Author(s):  
Serge Zacher
Keyword(s):  
Bode Plots

scholarly journals Static and Motional Feedthrough Capacitance of Flexural Microresonator

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
Wen-Teng Chang
Keyword(s):  
Silicon Carbide ◽  
Atmospheric Pressure ◽  
Network Analyzer ◽  
Reduced Pressure ◽  
Flexural Mode ◽  
Microelectromechanical System ◽  
Order Of Magnitude ◽  
Bode Plots

The present paper evaluates the static and motional feedthrough capacitance of a silicon carbide-based flexural-mode microelectromechanical system resonator. The static feedthrough capacitance was measured by a network analyzer under atmospheric pressure. The motional feedthrough was obtained by introducing various values into the modeling circuit in order to fit the Bode plots measured under reduced pressure. The static feedthrough capacitance was 0.02 pF, whereas the motional feedthrough capacitance of an identical device was about 0.2 pF, which is one order of magnitude larger than the static feedthrough capacitance.

Student understanding of phase shifts, frequency and Bode plots

2016 ◽  
Vol 54 (3) ◽  
pp. 247-261 ◽  
Author(s):  
Pieter Coppens ◽  
Johan Van den Bossche ◽  
Mieke De Cock
Keyword(s):  
Phase Shift ◽  
Time Domain ◽  
Engineering Students ◽  
Phase Shifts ◽  
Student Understanding ◽  
Bode Plots ◽  
Second Year ◽  
The Time Domain

In a series of interviews with second year electronics engineering students, several of them showed problems with signal properties. In a questionnaire administered to over 150 students in Belgium, these problems were further explored to verify how widespread they are. The questions asked about different aspects of signals. Students showed that they understand the concept of a phase shift, although they have problems with the direction. However, they generally have no idea what a signal with two frequencies looks like in the time domain. Bode plots also proved to be a problem for students, who are not able to construct one from a set of (dummy) measurements. Most of these issues persist after lab instruction.

Quantifying the Ontogeny of Optokinetic and Vestibuloocular Behaviors in Zebrafish, Medaka, and Goldfish

2004 ◽  
Vol 92 (6) ◽  
pp. 3546-3561 ◽  
Author(s):  
James C. Beck ◽  
Edwin Gilland ◽  
David W. Tank ◽  
Robert Baker
Keyword(s):  
Visual Stimulation ◽  
Larval Fish ◽  
Low Frequency ◽  
Velocity Storage ◽  
Active Movement ◽  
Stimulus Velocity ◽  
Oculomotor Behavior ◽  
Bode Plots ◽  
And Function ◽  
Eye Velocity

We quantitatively studied the ontogeny of oculomotor behavior in larval fish as a foundation for studies linking oculomotor structure and function with genetics. Horizontal optokinetic and vestibuloocular reflexes (OKR and VOR, respectively) were measured in three different species (goldfish, zebrafish, and medaka) during the first month after hatching. For all sizes of medaka, and most zebrafish, Bode plots of OKR (0.065–3.0 Hz, ±10°/s) revealed that eye velocity closely followed stimulus velocity (gain > 0.8) at low frequency but dropped sharply above 1 Hz (gain < 0.3 at 3 Hz). Goldfish showed increased gain proportional to size across frequencies. Linearity testing with steps and sinusoids showed excellent visual performance (gain > 0.8) in medaka almost from hatching; but zebrafish and goldfish exhibited progressive improvement, with only the largest equaling medaka performance. Monocular visual stimulation in zebrafish and goldfish produced gains of 0.5 versus <0.1 for the eye viewing a moving versus stationary stimulus pattern but 0.25 versus <0.1 in medaka. Angular VOR appeared much later than OKR, initially at only high accelerations (>200°/s at 0.5 Hz), first in medaka followed by larger (8.11 mm) zebrafish; but it was virtually nonexistent in goldfish. Velocity storage was not observed except for an eye velocity build-up in the largest medaka. In summary, a robust OKR was achieved shortly after hatching in all three species. In contrast, larval fish seem to be unique among vertebrates tested in their lack of significant angular VOR at stages where active movement is required for feeding and survival.

Asymptotic magnitude Bode plots of fractional-order transfer functions

2019 ◽  
Vol 6 (4) ◽  
pp. 1019-1026 ◽  
Author(s):  
Ameya Anil Kesarkar ◽  
Selvaganesan Narayanasamy
Keyword(s):  
Fractional Order ◽  
Transfer Functions ◽  
Bode Plots

Dynamic Characteristics of a Hydrostatic Gas Bearing Driven by Oscillating Exhaust Pressure

1984 ◽  
Vol 106 (4) ◽  
pp. 477-483 ◽  
Author(s):  
C. B. Watkins ◽  
H. D. Branch ◽  
I. E. Eronini
Keyword(s):  
Reynolds Equation ◽  
Numerical Solutions ◽  
Equations Of Motion ◽  
Equation Of Motion ◽  
Source Model ◽  
Regular Perturbation ◽  
Response Characteristics ◽  
Finite Difference Approximations ◽  
Bode Plots ◽  
Gas Bearing

Vibration of a statically loaded, inherently compensated hydrostatic journal bearing due to oscillating exhaust pressure is investigated. Both angular and radial vibration modes are analyzed. The time-dependent Reynolds equation governing the pressure distribution between the oscillating journal and sleeve is solved together with the journal equation of motion to obtain the response characteristics of the bearing. The Reynolds equation and the equation of motion are simplified by applying regular perturbation theory for small displacements. The numerical solutions of the perturbation equations are obtained by discretizing the pressure field using finite-difference approximations with a discrete, nonuniform line-source model which excludes effects due to feeding hole volume. An iterative scheme is used to simultaneously satisfy the equations of motion for the journal. The results presented include Bode plots of bearing-oscillation gain and phase for a particular bearing configuration for various combinations of parameters over a range of frequencies, including the resonant frequency.

scholarly journals Corrosion Performance of AISI-309 Exposed to Molten Salts V2O5-Na2SO4at 700°C Applying EIS andRpElectrochemical Techniques

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
E. F. Diaz ◽  
C. Cuevas-Arteaga ◽  
N. Flores-García ◽  
S. Mejía Sintillo ◽  
O. Sotelo-Mazón
Keyword(s):  
Molten Salts ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Metallic Surface ◽  
Corrosion Performance ◽  
Potentiodynamic Polarization Curve ◽  
Linear Polarization Resistance ◽  
Second Stage ◽  
Tafel Slopes ◽  
Bode Plots

The corrosion performance of AISI-309 exposed 5 days to molten salts 50 mol% V2O5-50 mol% Na2SO4at 700°C is reported in this paper. Such evaluation was made using three electrochemical techniques: potentiodynamic polarization curve (PC), electrochemical impedance spectroscopy (EIS), and linear polarization resistance (Rp). FromPC, the Tafel slopes,Icorr, andEcorrwere obtained. From Nyquist and Bode plots, it was possible to determine two different stages; the first one showed just one loop, which indicated the initial formation of Cr2O3layer over the metallic surface; after that, the dissolution of Cr2O3formed a porous layer, which became part of the corrosion products; at the same time a NiO layer combined with sulfur was forming, which was suggested as the second stage, represented by two capacitive loops. EIS plots were in agreement with the physical characterization made from SEM and EDS analyses. Fitting of EIS experimental data allowed us to propose two electrical circuits, being in concordance with the corrosion stages. Parameters obtained from the simulation of EIS data are also reported. From the results, it was stated that AISI-309 suffered intergranular corrosion due to the presence of sulfur, which diffused to the metallic surface through a porous Cr2O3layer.

Frequency Analysis Tools for a First Control Course Using MATLAB

1993 ◽  
Author(s):  
Kourosh Rahnamai
Keyword(s):  
New England ◽  
Frequency Response ◽  
Frequency Analysis ◽  
Software Package ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Learning Methods ◽  
Matlab Software ◽  
Compensator Design ◽  
Bode Plots

Abstract A set of routines is developed using the MATLAB software package to aid students in learning methods of frequency response analysis. Routines are menu driven which would require minimum knowledge of MATLAB commands. A rapid sketch of asymptotic Bode plots is emphasized which is the basis for the lead, lag, and lead-lag compensator design techniques in the first control course taught at Western New England College.

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