2 edition of Pressure balanced, low hysteresis, finger seal test results found in the catalog.
Pressure balanced, low hysteresis, finger seal test results
by National Aeronautics and Space Administration, Glenn Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va
Written in English
|Statement||Gul K. Arora ... [et al.].|
|Series||NASA/TM -- 1999-209191., NASA technical memorandum -- 209191.|
|Contributions||Arora, Gul K., NASA Glenn Research Center.|
|The Physical Object|
Test Results Four graphs are used to display test results: step response time series, step response with supply pressure, step response with drive, and dead band plus hysteresis X-Y plot. The step response graph displays travel set point and travel time series data. A typical time series plot of travel set point and travel is presented in figure 3. An international agreement on the presentation and comparison of test results is needed as a supplement to ISO/DIS Key words: cold provocation test, finger systolic blood pressure, Raynaud's phenomenon, standardization, vibration-induced white finger. References.
High pressure rotary lip seal test results ” (mm) KLS lip seals were tested at 1, psi ( MPa) with a surface speed of feet per minute ( m/s), using an . Highly uniform and low hysteresis pressure sensor to increase practical applicability by The Korea Advanced Institute of Science and Technology (KAIST) Figure 1.
Kelly Pneumatics, Inc. offers a Low Hysteresis Proportional Valve with high volume flow capabilities. This valve provides the second-highest flow performance and lowest hysteresis of our proportional valve product line, while still utilizing award winning, single armature design, ensuring virtually frictionless performance and longevity tested at over million cycles. This results in an increased loss of tensile hysteresis in the belt webbing. The ratio of H F to H in BE12CD12 webbing increased to %. It is evident that the hysteresis loss of the webbings in the stretch-recovery measurement within 30% strain is a result of the Lycra fiber itself, the friction among the yarns, and the webbing structures.
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The best design is a pressure balanced finger seal with higher stiffness fingers. The low hysteresis seal design has undergone extensive rig testing to assess its hysteresis, leakage performance. Pressure Balanced, Low Hysteresis Finger Seal Test Results Gul K. Arora Allied Signal Engines Margaret P.
Proctor and Bruce M. Steinetz NASA Glenn Research Center at Lewis Field Irebert R. Delgado Army Research Laboratory NASA Glenn Research Center at Lewis Field NASA/CP/VOL 1 Get this from a library. Pressure balanced, low hysteresis, finger seal test results. [Gul K Arora; NASA Glenn Research Center.;].
Pressure balanced, low hysteresis, finger seal test results. Preliminary Test Results of Non-Contacting Finger Seal on Herringbone-Grooved Rotor. Margaret Proctor and Irebert Delgado; 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit June Testing of pressure balanced compliant seal in air.
Request PDF | Pressure Balanced, Low Hysteresis Finger Seal Test Results | The purpose of this presentation is to demonstrate: low cost photoetching fabrication technique; pressure balanced finger. Pressure Balanced, Low Hysteresis Finger Seal Test Results. By Gul K.
Arora, Margaret Proctor, Bruce M. Steinetz and Irebert R. Delgado. Abstract. The purpose of this presentation is to demonstrate: low cost photoetching fabrication technique; pressure balanced finger seal design; and finger seal operation.
The tests and analyses includes. Preliminary Test Results of Non-Contacting Finger Seal on Herringbone-Grooved Rotor. Margaret Proctor and Irebert Delgado; 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit June Pressure balanced, low hysteresis, finger seal test results.
Arora, M.P. Proctor, B.M. Steinetz, I.R. Delgado, Pressure Balanced Low Hysteresis Finger Seal Test TM – () Google Scholar.
Arora G K, Margaret P P, Steinetz B M, et al. Pressure balanced low hysteresis finger seal test results. In: Proceedings of the 35th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, Los Angeles (CA), 1– The actual operating conditions of the device can however differ significantly from the test conditions.
Test procedures between manufacturers can also vary widely, which makes comparability of the data even more difficult. In general, it is recommended that the pressure transducer be calibrated at regular intervals and, if necessary, adjusted.
Fig. 3 shows the computational domain of the finger seal leakage flow, which is related to the clearances between finger boots and the rotor. As shown in Fig. 3, the coordinate axes x, y, z represent the circumferential, radial, and axial directions of the finger seal, respectively.
The boundary conditions are set as follows. The total pressure is prescribed at inlet 1 and the static pressure. Pressure Balanced, Low Hysteresis, Finger Seal Test Results,” AIAA.
Paper No. Proctor, M., and. Delgado, I.,“ Preliminary Test Results of a Non-Contacting Finger Seal on a Herringbone-Grooved Rotor,” AIAA. Paper No. Analysis of Radial Compressor Performance at Low Pressure Ratios and Compressor Choke.
According to the working condition of the finger seal, a geometric model applied to optimization of finger seal with arc curve (arc finger seal) is established based on mathematical relationship analysis of the finger seal structural parameters.
Two performances, the hysteresis and contact pressure between finger pad and rotors surface, are put forward as the objectives for the structure.
 Arora G. et al. Pressure Balanced, Low Hysteresis, Finger Seal Test Results. AIAA (). AIAA ().  Zhou Shengqiang, Xiang Jinwu. An alternative dynamic pressure-balanced (DPB) seal uses the flow and pressure drop associated with the fluid it is sealing to generate a force-balanced seal system with an operational clearance as tight as a few thousandths of an inch (hundredths of a millimeter) over the rotor surface.
A cross-section of the DPB seal is shown in Fig. Current pressure balanced finger seals are designed to be operated with the axial pressure difference across the seal acting in one direction.
This limits their application and prevents finger seals from being used in locations where the axial pressure differential may reverse.
A little bit of history behind the term - the word hysteresis is derived form an Ancient Greek word that means "lagging behind", and was introduced by a Scottish physicist Sir James Alfred Ewing in the late nineteenth century.
He applied the term to describe certain magnetic properties of metals, but later on this term began to be used to describe "lagging behind" of any system's response to. As stated, if you plan on conducting a hydrotest of the pump with the seal installed, you really need to make sure that the seal can handle the anticipated test pressure: times operating pressure should be sufficient for a test pressure of the pump casing with the seal installed; times max allowable work pressure of the pump casing is.
In the late s a low cost, pressure-balanced, low hysteresis finger seal was developed and successfully demonstrated at operating conditions of fps, 60 psid, and °F and fps, 80 psid, and °F.
Both the seal and rotor were in excellent condition after hours of endurance testing.4 The finger seal is a contacting. IEC states that accuracy must include Hysteresis, Non-Repeatability and Non-Linearity.
Non-Repeatability and Hysteresis are well defined. Hysteresis is the maximum difference in sensor output at a pressure when that pressure is first approached with pressure increasing and then approached with pressure decreasing during a full span. Corneal Hysteresis Measurement Current evidence for corneal hysteresis measurement focuses on the risk, diagnosis and progression of glaucoma however, these studies do not demonstrate how corneal hysteresis measurement influences clinical management or outcomes.
Additional clinical trials are necessary to determine its benefit in clinical practice.Hysteresis, while similar to repeatability, is a little more nuanced, yet equally and independently important in determining the quality of a Bourdon tube pressure gauge.
Hysteresis is a measure of how effectively a pressure gauge is in repeating the upscale reading on the down scale cycle if all conditions remain the same.the test medium into the environment under pressure. Even worse, failure to isolate a gauge, meter, or some other component that isn’t designed to endure the test pressure can cause it to shatter under pressure creating high-speed flying objects.
Review the pre-test .