A unified stability analysis method for spontaneous oscillation condition s in thermoacoustic systems via measured frequency response data with application to standing- and traveling-wave engines

2019 ◽  
Vol 456 ◽  
pp. 86-103 ◽  
Author(s):  
Yasuhide Kobayashi ◽  
Shotaro Shinoda ◽  
Takumi Nakata ◽  
Noboru Yamada
Keyword(s):  
Stability Analysis ◽  
Frequency Response ◽  
Traveling Wave ◽  
Analysis Method ◽  
Response Data ◽  
Oscillation Condition ◽  
Measured Frequency ◽  
Spontaneous Oscillation ◽  
Measured Frequency Response

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.

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