scholarly journals Effect of Pressure Transmission Lines on the Frequency Response of Pressure Transducers

2000 ◽  
Author(s):  
G.J. Kirouac
Keyword(s):  
Frequency Response ◽  
Transmission Lines ◽  
Pressure Transducers ◽  
Effect Of Pressure ◽  
Pressure Transmission

Coupled microstrip filters on multilayered dielectric media

2002 ◽  
Vol 80 (6) ◽  
pp. 675-685
Author(s):  
Ar. Koufogiannidis ◽  
K Siakavara
Keyword(s):  
Frequency Response ◽  
Transmission Lines ◽  
Insertion Loss ◽  
Design Procedure ◽  
Multiconductor Transmission Lines ◽  
Microstrip Lines ◽  
Dielectric Media ◽  
Microstrip Filters ◽  
Loss Method ◽  
Good Agreement

The work presented in this paper is an attempt to design filters with coupled microstrip lines on multilayered dielectric media using methods employed in other applications. A procedure was formulated for designing filters with the desired frequency response and smaller size using insertion loss method combined with the theory of multiconductor transmission lines. The frequency response was verified by considering that the filters act as cascaded four-port networks. The results were in a very good agreement with those expected from the theoretically design procedure. PACS No.: 84.40D

The Generalized Response of Servovalve-Controlled, Single-Rod, Linear Actuators and the Influence of Transmission Line Dynamics

1984 ◽  
Vol 106 (2) ◽  
pp. 157-162 ◽  
Author(s):  
J. Watton
Keyword(s):  
Transmission Line ◽  
Frequency Response ◽  
System Design ◽  
Dynamic Behavior ◽  
Transmission Lines ◽  
Fatigue Testing ◽  
Open Loop ◽  
Linear Actuators ◽  
Probable Type

The open-loop response of servovalve-controlled single-rod linear actuators in investigated for both the extending and retracting cases. A linearized frequency response technique is used to establish the probable type of dynamic behavior. Nondimensional results are presented as an aid to system design, and a boundary is established such that a simplified approximation may be used. A particular class of system is then examined where interconnecting transmission lines would be important, and the techniques previously used are modified accordingly. The techniques are verified with a precision actuator developed for fatigue testing of vehicle and airframe systems.

Nuclear Blast Response of Airbreathing Propulsion Systems: Laboratory Measurements With an Operational J-85-5 Turbojet Engine

1982 ◽  
Vol 104 (3) ◽  
pp. 624-632 ◽  
Author(s):  
M. G. Dunn ◽  
J. M. Rafferty
Keyword(s):  
Frequency Response ◽  
Blast Wave ◽  
Test Section ◽  
Maximum Speed ◽  
Laboratory Measurements ◽  
Propulsion Systems ◽  
Pressure Transducers ◽  
Ludwieg Tube ◽  
Turbojet Engine ◽  
Blast Response

This paper describes an experimental technique that has been developed for the performance of controlled laboratory measurements of the nuclear blast response of airbreathing propulsion systems. The experiments utilize an available G.E. J-85-5 turbojet engine located in the test section of the Calspan Ludwieg-tube facility. Significant modifications, described herein, were made to this facility in order to adapt it to the desired configuration. The J-85 engine had previously been used at Calspan for other purposes and thus came equipped with eight pressure transducers at four axial locations along the compressor section. These transducers have a frequency response on the order of 40 KHz. Pressure histories obtained at several circumferential and axial locations along the compressor are presented for blast-wave equivalent overpressures up to 17.2 kPa (2.5 psi) at corrected engine speeds on the order of 94 percent of maximum speed.

Signal Shaping of Fluid Transmission Lines Using Parallel Branching

1986 ◽  
Vol 108 (4) ◽  
pp. 296-305 ◽  
Author(s):  
W. C. Yang ◽  
D. L. Margolis
Keyword(s):  
Frequency Response ◽  
Transmission Lines ◽  
Graph Model ◽  
Parallel Line ◽  
Line Length ◽  
Approximation Techniques ◽  
Frequency Domains ◽  
Line Characteristic ◽  
Fluid Transients ◽  
And Control

The dynamic characteristics of fluid transmission lines with a parallel branching line are analyzed in both time and frequency domains using modal approximation techniques which enable us to use linear system theory. For hydraulic blocked lines, root loci of dominant modes as functions of parallel line length ratio, branching location and line characteristic parameters are obtained, and also unit step and frequency responses are illustrated for various parallel line configurations. By properly adding a parallel branching line, shaping of frequency response and control of fluid transients can be accomplished in various advantageous ways, i.e., shifting the resonant frequencies, improving the resonant quality, suppressing the frequency response for particular bands of frequencies including the resonance regions, phase leading. The steady state conditions are derived in an exact manner and a modal bond graph model is presented.

An Experimental and Theoretical Investigation of Wave Propagation in Teflon and Nylon Tubing With Methods to Prevent Aliasing in Pressure Scanners

2013 ◽  
Author(s):  
Adam M. Hurst ◽  
Joe VanDeWeert
Keyword(s):  
Frequency Response ◽  
Dynamic Pressure ◽  
Sampling Rate ◽  
Aircraft Design ◽  
Experimental Results ◽  
Analytical Models ◽  
Pressure Measurements ◽  
Pressure Transmission ◽  
Dynamic Pressure Measurements ◽  
Nylon Tubing

Accurate static and dynamic pressure measurements provide the feedback needed to advance gas turbine efficiency and reliability as well as improve aircraft design and flight control. During turbine testing and aircraft flight testing, flush mounting pressure transducers at the desired pressure measurement location is not always feasible and recess mounting with connective tubing is often used as an alternative. Resonances in the connective tubing can result in aliasing within pressure scanners even within a narrow bandwidth and especially when higher frequency content DC to ∼125Hz is desired. We present experimental results that investigate tube resonances and attenuation in 1.35mm inner diameter (ID) (used on 0.063in tubulations) and 2.69mm ID (used on 0.125in tubulations) Teflon and Nylon tubing at various lengths. We utilize a novel dynamic pressure generator, capable of creating large changes in air pressure (<1psi to 10psi, <6.8kPa to 68.9kPa), to determine the frequency response of such tubing from ∼1Hz to 2,800Hz. We further compare these experimental results to established analytical models for propagation of pressure disturbances in narrow tubes. While significant theoretical and experimental work relating to the frequency response of connective tubing or transmission lines has been published, there is limited literature presenting experimental frequency response data with air as the media in elastic tubing. In addition, little progress has been made in addressing the issue of tubing-related aliasing within pressure scanners, as the low sampling rate in scanners often makes post-processing antialiasing filters ineffective. The experimental results and analytical models presented herein can be used as a guideline to prevent aliasing and signal distortion by guiding the proper design of pressure transmission systems, resulting in accurate static and dynamic pressure measurements with pressure scanners. The data presented here should serve as a reference to instrumentation engineers so that they can make higher frequency measurements (up to ∼125Hz, currently) and are able to quantify the expected pressure transmission line (tube) attenuation and know if aliasing will be a concern. This information will give engineers greater measurement capability when using pressure scanners to make static and dynamic pressure measurements.

scholarly journals Design of a Broadband Band-Pass Filter with Notch-Band Using New Models of Coupled Transmission Lines

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Navid Daryasafar ◽  
Somaye Baghbani ◽  
Mohammad Naser Moghaddasi ◽  
Ramezanali Sadeghzade
Keyword(s):  
Frequency Response ◽  
Transmission Lines ◽  
Band Pass Filter ◽  
Pass Filter ◽  
New Model ◽  
Notch Band ◽  
New Models ◽  
Basic Parameters ◽  
Band Pass ◽  
Coupled Transmission Lines

We intend to design a broadband band-pass filter with notch-band, which uses coupled transmission lines in the structure, using new models of coupled transmission lines. In order to realize and present the new model, first, previous models will be simulated in the ADS program. Then, according to the change of their equations and consequently change of basic parameters of these models, optimization and dependency among these parameters and also their frequency response are attended and results of these changes in order to design a new filter are converged.

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