Verification of Compressor Data Accuracy by Uncertainty Analysis and Testing Methods

1988 ◽  
Vol 110 (2) ◽  
pp. 265-269 ◽  
Author(s):  
N. D. Poti ◽  
D. C. Rabe
Keyword(s):  
Uncertainty Analysis ◽  
Spatial Variation ◽  
Air Force ◽  
Test Results ◽  
General Electric Company ◽  
Transonic Compressor ◽  
Air Force Base ◽  
Experimental Values ◽  
The Individual

A transonic compressor designed and instrumented by the General Electric Company was recently evaluated during several test programs in the Compressor Research Facility at Wright-Patterson Air Force Base. An analytical uncertainty analysis was performed for the individual measurements, as well as the calculated performance parameters. During the tests, the experimental values of precision uncertainty were compared to the analytical predictions. The spatial variation of the individual discharge measurements was evaluated for its effect on the uncertainty of the measured parameters and calculated performance. Through the comparison of the analytical and measured uncertainty and the evaluation of spatial variation, a final uncertainty of the measured performance is presented, and the overall quality of the test results is assessed. Through these data reviews, a more accurate understanding of the performance of the test compressor is obtained.

scholarly journals The Aeromechanical Response of an Advanced Transonic Compressor to Inlet Distortion

1987 ◽  
Author(s):  
J. T. Datko ◽  
J. A. O’Hara
Keyword(s):  
Air Force ◽  
Total Pressure ◽  
Dynamic Measurements ◽  
General Electric Company ◽  
Transonic Compressor ◽  
Inlet Distortion ◽  
Bladed Disk ◽  
Electric Company ◽  
Baseline Testing ◽  
Air Force Base

An advanced transonic compressor was tested in the Compressor Research Facility at the Aero Propulsion Laboratory, Wright-Patterson Air Force Base, Ohio. This compressor was designed, built, and instrumented by the General Electric Company under Air Force contract. During this test, the compressor was operated with seven different total pressure distortion screens located at the inlet, along with baseline testing of two “clean” inlet configurations. Of particular interest was the forced vibratory response of the compressor first stage integrally bladed disk (blisk) to the various distortions. This paper presents a summary of the blisk vibratory responses to each of the distortion screens. Effects of instrumentation on the dynamic response of the blisk are illustrated. In addition, the measured steady total pressure inlet distortion profiles for each screen are shown with a summary of the instrumentation used to make the various steady and dynamic measurements.

Characterization of Shock Wave–Endwall Boundary Layer Interactions in a Transonic Compressor Rotor

1988 ◽  
Vol 110 (3) ◽  
pp. 386-392 ◽  
Author(s):  
D. C. Rabe ◽  
A. J. Wennerstrom ◽  
W. F. O’Brien
Keyword(s):  
Boundary Layer ◽  
Shock Wave ◽  
Air Force ◽  
Leading Edge ◽  
Transonic Compressor ◽  
Laser Measurements ◽  
Compressor Rotor ◽  
Boundary Layer Interaction ◽  
Air Force Base

The passage shock wave–endwall boundary layer interaction in a transonic compressor was investigated with a laser transit anemometer. The transonic compressor used in this investigation was developed by the General Electric Company under contract to the Air Force. The compressor testing was conducted in the Compressor Research Facility at Wright-Patterson Air Force Base, OH. Laser measurements were made in two blade passages at seven axial locations from 10 percent of the axial blade chord in front of the leading edge to 30 percent of the axial blade chord into the blade passage. At three of these axial locations, laser traverses were taken at different radial immersions. A total of 27 different locations were traversed circumferentially. The measurements reveal that the endwall boundary layer in this region is separated from the core flow by what appears to be a shear layer where the passage shock wave and all ordered flow seem to end abruptly.

The Calibration of Thermocouples by Freezing-Point Baths and Empirical Equations

1959 ◽  
Vol 81 (2) ◽  
pp. 177-188 ◽  
Author(s):  
R. P. Benedict
Keyword(s):  
Digital Computer ◽  
High Speed ◽  
Freezing Point ◽  
Individual Characteristics ◽  
Empirical Equations ◽  
Test Results ◽  
Calibration System ◽  
Temperature Range ◽  
Experimental Values ◽  
The Individual

A calibration system is described which is based on the use of a few precisely determined experimental values obtained from freezing-point baths. Characteristics of the individual thermocouples at intermediate points are obtained by passing empirical equations of prescribed form through the test values. A program is reviewed, by which a high-speed digital computer accomplishes the necessary conversions, curve fittings, comparisons of individual characteristics with arbitrary reference tables, and the printing out of a table of differences. Test results for a series of iron-constantan thermocouples, over the temperature range 32–1225 F, are presented to illustrate the use of the system and the uncertainties involved. Comparisons are drawn between these results and those obtained by other methods.

scholarly journals Vector interpretation of students’ residual knowledge assessment

2018 ◽  
Vol 7 (4) ◽  
pp. 335-339
Author(s):  
Sergey Ivanovich Makarov ◽  
Svetlana Aleksandrovna Sevastyanova
Keyword(s):  
Educational Process ◽  
Knowledge Assessment ◽  
Vector Model ◽  
Quality Of Education ◽  
Test Results ◽  
Education Management ◽  
Computer Testing ◽  
The Individual ◽  
Russian Education

Residual knowledge assessment is one of the procedures used in the Russian education system to monitor the quality of education at various levels. Typically, this procedure is considered to be a computer testing of the previously learned disciplines. The analysis of test results gives grounds for making necessary decisions. This determines the importance of reliable, accessible and informative presentation of monitoring results. The paper contains a method of visualization and interpretation of residual knowledge assessment results. The authors think that it is possible to use this method for analyzing the problems of training at the individual and group levels. For statistical information processing it is offered to use a vector form of data presentation. The paper contains examples of using a vector model for estimating the level of residual knowledge in three or more disciplines. The authors propose an approach that solves the problem of test results comparability carried out in various estimation systems. The main conclusions and results can be used directly in the educational process, in the field of education management, in psychological and pedagogical work.

The New Triaxial Shock and Vibration Test System at Hill Air Force Base

1998 ◽  
Vol 41 (2) ◽  
pp. 27-32 ◽  
Author(s):  
Min Chen ◽  
Delbert Wilson
Keyword(s):  
Air Force ◽  
High Speed ◽  
Vertical Axis ◽  
Test System ◽  
Test Results ◽  
Air Force Base ◽  
Six Degree Of Freedom ◽  
The Hill ◽  
Drive Signals ◽  
Hill Air Force Base

To achieve large-missile guidance qualification, modification, and reliability tests and analysis, the Hill Air Force Base Survivability & Vulnerability Integration Center (SVIC) has installed a six-degree-of-freedom shock and vibration system. Designed and developed by Wyle Laboratories Inc., this system in driven in the frequency range of 5 to 2000 Hz by eight electrodynamics shakers, two in each horizontal axis and four in the vertical axis. The major design concern is the coupling of the shakers through a rigid table due to kinetic and dynamic effects and the behavior of the structure. This has made the control task very challenging. A method was developed that coordinates the drive signals to compensate for cross-coupling effects. Based upon tests to date, the system is an effective, reliable, and capable test platform. In this paper, we discuss the design objectives, provide a brief description of the hardware, and elaborate on the high-speed, digital control system driving the eight electrodynamics shakers. A brief description of the test results is provided.

Semi-automated methods for 3-D reconstruction of macromolecular complexes

1995 ◽  
Vol 53 ◽  
pp. 42-43
Author(s):  
B. Carragher ◽  
M. Whittaker
Keyword(s):  
Three Dimensional ◽  
Time Saving ◽  
Macromolecular Complexes ◽  
Symmetry Properties ◽  
Dimensional Reconstruction ◽  
Experienced Operator ◽  
Projection Images ◽  
The Individual ◽  
Natural Symmetry

Techniques for three-dimensional reconstruction of macromolecular complexes from electron micrographs have been successfully used for many years. These include methods which take advantage of the natural symmetry properties of the structure (for example helical or icosahedral) as well as those that use single axis or other tilting geometries to reconstruct from a set of projection images. These techniques have traditionally relied on a very experienced operator to manually perform the often numerous and time consuming steps required to obtain the final reconstruction. While the guidance and oversight of an experienced and critical operator will always be an essential component of these techniques, recent advances in computer technology, microprocessor controlled microscopes and the availability of high quality CCD cameras have provided the means to automate many of the individual steps.During the acquisition of data automation provides benefits not only in terms of convenience and time saving but also in circumstances where manual procedures limit the quality of the final reconstruction.

Implementasi Voip Server Berbasis IPV6 Dengan Raspberry PI

2019 ◽  
Vol 9 (01) ◽  
pp. 47-54
Author(s):  
Rabbai San Arif ◽  
Yuli Fitrisia ◽  
Agus Urip Ari Wibowo
Keyword(s):  
Internet Protocol ◽  
Wireless Transmission ◽  
Raspberry Pi ◽  
Test Results ◽  
Average Delay ◽  
Ipv6 Network ◽  
Ip Network ◽  
Selection Of ◽  
Better Than

Voice over Internet Protocol (VoIP) is a telecommunications technology that is able to pass the communication service in Internet Protocol networks so as to allow communicating between users in an IP network. However VoIP technology still has weakness in the Quality of Service (QoS). VOPI weaknesses is affected by the selection of the physical servers used. In this research, VoIP is configured on Linux operating system with Asterisk as VoIP application server and integrated on a Raspberry Pi by using wired and wireless network as the transmission medium. Because of depletion of IPv4 capacity that can be used on the network, it needs to be applied to VoIP system using the IPv6 network protocol with supports devices. The test results by using a wired transmission medium that has obtained are the average delay is 117.851 ms, jitter is 5.796 ms, packet loss is 0.38%, throughput is 962.861 kbps, 8.33% of CPU usage and 59.33% of memory usage. The analysis shows that the wired transmission media is better than the wireless transmission media and wireless-wired.

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