A Simple Linearized Hot-Wire Anemometer

1976 ◽  
Vol 98 (4) ◽  
pp. 749-752 ◽  
Author(s):  
James A. Miller
Keyword(s):  
Transfer Function ◽  
Frequency Response ◽  
High Stability ◽  
Hot Wire ◽  
Measured Frequency ◽  
Measured Frequency Response ◽  
Incompressible Media ◽  
Very High

The circuit and application of an inexpensive simple linearized hot wire anemometer especially suited to turbulence research in incompressible media is described. Special features of the design are very high stability, simple bridge adjustment, and a linearizer having an adjustable exponent and very high transfer function accuracy. Measured frequency response is in excess of 100 kilohertz for the bridge and 7.5 kilohertz for the linearizer.

The transfer function of a short-period vertical seismograph

1961 ◽  
Vol 51 (4) ◽  
pp. 503-513
Author(s):  
B. P. Bogert
Keyword(s):  
Transfer Function ◽  
Frequency Response ◽  
Least Squares ◽  
Damping Ratio ◽  
Weighted Least Squares ◽  
Measured Frequency ◽  
Least Squares Fit ◽  
Short Period ◽  
Measured Frequency Response ◽  
Poles And Zeros

Abstract We locate the poles and zeros of the transfer function of a seismograph which consists of the Geotech Model 1051 Benioff vertical seismometer and the Geotech Model 4500 galvanometer-phototube amplifier with a 5 cps galvanometer. A weighted least squares fit to the measured frequency response of the seismometer, assuming a damping ratio of 17 to 1, gives for the pole locations of the seismometer transfer function: - 10 . 539 ; - 5 . 787 + i 7 . 407 ; - 5 . 787 - i 7 . 407 There is a triple zero at the origin. The overall seismograph transfer function has additional poles at - 22 . 21 + i 22 . 21 ; - 22 . 21 - i 22 . 21 ; - 0 . 06283 ; - 29 . 62 + i 29 . 62 ; - 29 . 62 - i 29 . 62 ; an additional zero at the origin, and a quadruple zero at infinity. an additional zero at the origin, and a quadruple zero at infinity.

Calculation of Component Mode Synthesis Matrices From Measured Frequency Response Functions, Part 2: Application

1998 ◽  
Vol 120 (2) ◽  
pp. 509-516 ◽  
Author(s):  
J. A. Morgan ◽  
C. Pierre ◽  
G. M. Hulbert
Keyword(s):  
Frequency Response ◽  
Coupled System ◽  
Companion Paper ◽  
Component Mode Synthesis ◽  
Response Functions ◽  
Frequency Response Functions ◽  
Measured Frequency ◽  
Measured Frequency Response ◽  
Coupled Beams ◽  
The Individual

This paper demonstrates how to calculate Craig-Bampton component mode synthesis matrices from measured frequency response functions. The procedure is based on a modified residual flexibility method, from which the Craig-Bampton CMS matrices are recovered, as presented in the companion paper, Part I (Morgan et al., 1998). A system of two coupled beams is analyzed using the experimentally-based method. The individual beams’ CMS matrices are calculated from measured frequency response functions. Then, the two beams are analytically coupled together using the test-derived matrices. Good agreement is obtained between the coupled system and the measured results.

scholarly journals A Two Channel Analog Front end Design AFE Design with Continuous Time Σ-Δ Modulator for ECG Signal

2018 ◽  
Vol 8 (6) ◽  
pp. 5041 ◽  
Author(s):  
Mohammed Abdul Raheem ◽  
K Manjunathachari
Keyword(s):  
Frequency Response ◽  
Research Work ◽  
Cmos Process ◽  
Type I ◽  
Sigma Delta ◽  
Front End ◽  
Measured Frequency ◽  
Analog Front End ◽  
Measured Frequency Response ◽  
Power Application

In this context, the AFE with 2-channels is described, which has high impedance for low power application of bio-medical electrical activity. The challenge in obtaining accurate recordings of biomedical signals such as EEG/ECG to study the human body in research work. This paper is to propose Multi-Vt in AFE circuit design cascaded with CT modulator. The new architecture is anticipated with two dissimilar input signals filtered from 2-channel to one modulator. In this methodology, the amplifier is low powered multi-VT Analog Front-End which consumes less power by applying dual threshold voltage. Type -I category 2 channel signals of the first mode: 50 and 150 Hz amplified from AFE are given to 2nd CT sigma-delta ADC. Depict the SNR and SNDR as 63dB and 60dB respectively, consuming the power of 11mW. The design was simulated in a 0.18 um standard UMC CMOS process at 1.8V supply. The AFE measured frequency response from 50 Hz to 360 Hz, depict the SNR and SNDR as 63dB and 60dB respectively, consuming the power of 11mW. The design was simulated in 0.18 m standard UMC CMOS process at 1.8V supply. The AFE measured frequency response from 50 Hz to 360 Hz, programmable gains from 52.6 dB to 72 dB, input referred noise of 3.5 μV in the amplifier bandwidth, NEF of 3.

Detection of Local Damage of Flexural Member Using Measured Frequency Response Functions

2018 ◽  
Vol 23 (No 3, September 2018) ◽  
pp. 314-320
Author(s):  
Eun-Taik Lee ◽  
Hee-Chang Eun
Keyword(s):  
Damage Detection ◽  
Frequency Response ◽  
Damage Index ◽  
External Noise ◽  
Local Damage ◽  
Response Functions ◽  
Frequency Response Functions ◽  
Measured Frequency ◽  
Measured Frequency Response ◽  
Proper Orthogonal

Measurements by sensors provide inaccurate information, including external noises. This study considers a method to reduce the influence of the external noise, and it presents a method to detect local damage transforming the measured frequency response functions (FRFs) to reduce the influence of the external noise. This study is conducted by collecting the FRFs in the first resonance frequency range from the responses in the frequency domain, taking the mean values at two adjacent nodes, and transforming the results to the proper orthogonal decomposition (POD). A damage detection method is provided. The curvature of the proper orthogonal mode (POM) corresponding to the first proper orthogonal value (POV) is utilized as the damage index to indicate the damage region. A numerical experiment and a floor test of truss bridge illustrate the validity of the proposed method for damage detection.

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