Design and component test results of the LSST Camera L1-L2 lens assembly

2017 ◽  
Author(s):  
Allison A. Barto ◽  
Scott E. Winters ◽  
James H. Burge ◽  
Deborah Davies ◽  
John Richer ◽  
...  
Keyword(s):  
Test Results ◽  
Component Test ◽  
Lens Assembly

scholarly journals Prediction of fatigue limit of journal bearings considering a multi-axial stress state

2016 ◽  
Vol 68 (3) ◽  
pp. 430-438 ◽  
Author(s):  
Christopher Sous ◽  
Henrik Wünsch ◽  
Georg Jacobs ◽  
Christoph Broeckmann
Keyword(s):  
Stress State ◽  
Axial Stress ◽  
Design Guidelines ◽  
Journal Bearings ◽  
Operating Conditions ◽  
Test Results ◽  
Content Type ◽  
Operation Conditions ◽  
Component Test ◽  
Material Tests

Purpose The purpose of this paper is to investigate the applicability of the quadratic failure hypothesis (QFH) on journal bearings coated with a white metal sliding layer on the prediction of safe and unsafe operating conditions. The hypothesis covers operation conditions under static and dynamical loading. Design/methodology/approach Material tests and elastohydrodynamic, as well as structural, simulations were conducted to provide the required input data for the failure hypothesis. Component samples were tested to verify the results of the QFH. Findings The load bearing capacity of journal bearings was analysed for different operating conditions by the use of the QFH. Results allow for the identification of critical and non-critical loading conditions and are in accordance with component test results. Originality/value Today’s design guidelines for journal bearings do not consider a multi-axial stress state and actual stress distribution. The applied hypothesis enables consideration of multiaxiality inside the sliding surface layer, as well as determining the location of bearing fatigue due to material overload.

Component Mode Synthesis Using Component Test Results

2002 ◽  
Vol 2002.1 (0) ◽  
pp. 297-298
Author(s):  
Kenichi FUNAMOTO ◽  
Masayoshi MISAWA
Keyword(s):  
Component Mode Synthesis ◽  
Test Results ◽  
Component Test

Development of an Aeroderivative Gas Turbine Dry Low Emissions Combustion System

1994 ◽  
Vol 116 (3) ◽  
pp. 542-546 ◽  
Author(s):  
G. Leonard ◽  
J. Stegmaier
Keyword(s):  
Gas Turbine ◽  
Aircraft Engine ◽  
System Component ◽  
Test Results ◽  
Combustion System ◽  
Fuel Delivery ◽  
Component Test ◽  
Engine Combustion ◽  
Annular Combustor ◽  
New System

This paper gives the development status of GE’s new aeroderivative premixed combustion system. This system consists of a new fuel staged annular combustor, compressor rear frame, first-stage turbine nozzle, electronic staging controller, and fuel delivery system. Component test results along with a description of the combustion system are presented. This new system will reduce NOx emissions by 90 percent relative to the original aircraft engine combustion system while maintaining low emissions of CO and UHCs. Tests of a LM6000 gas turbine equipped with the new system are planned for early 1994.

scholarly journals LO26: The mean abnormal response rates of laboratory tests ordered in the emergency department: shooting percentage insights from a multicentre study

CJEM ◽  
2020 ◽  
Vol 22 (S1) ◽  
pp. S16-S16
Author(s):  
E. Enwere ◽  
D. Wang ◽  
M. Guo ◽  
C. Naugler ◽  
E. Lang
Keyword(s):  
Administrative Data ◽  
Laboratory Tests ◽  
Population Data ◽  
Primary Objective ◽  
High Yield ◽  
Test Results ◽  
Abnormal Result ◽  
Component Test ◽  
Abnormal Response ◽  
The Mean

Introduction: There is ongoing concern about the burden placed on healthcare systems by lab tests. Although these concerns are widespread, it is difficult to quantify the extent of the problem. One approach involves use of a metric known as the Mean Abnormal Response Rate (MARR), which is the proportion of tests ordered that return an abnormal result; a higher MARR value indicates higher yield. The primary objective of this study was to calculate MARRs for tests ordered between April 2014 and March 2019 at the four adult emergency departments (EDs) covering a metropolitan population of 1.3 million. Secondary objectives included identifying tests with highest and lowest MARRs; comparison of MARRs for nurse- and physician-initiated orders; correlation of the number of tests per order requisition to MARR; and correlation of physician experience to MARR. Methods: In total, 40 laboratory tests met inclusion criteria for this study. Administrative data on these tests as ordered at the four EDs were obtained and analyzed. Multi-component test results, such as from CBC, were consolidated such that an abnormal result for any component was coded as an abnormal result for the entire test. Repeat tests ordered within a single patient visit were excluded. Physician experience was quantified for 209 ED physicians as number of years since licensure. Analyses were descriptive where appropriate for whole-population data. Risk of bias was attenuated by the focus on administrative data. Results: The population dataset comprised 33,757,004 test results on 415,665 unique patients. Of these results, 30.3% were the outcomes of nurse-initiated orders. The 5-year MARRs for the four hospitals were 38.3%, 40.0%, 40.7% and 40.9%. The highest per-test MARRs were for BNP (80.5%) and CBC (62.6%), while the lowest were for glucose (7.9%) and sodium (11.6%). MARRs were higher for nurse-initiated orders than for physician-initiated orders (44.7% vs. 38.1%), likely due to the greater order frequency of high-yield CBC in nurse-initiated orders (38.6% vs. 18.1%). The number of tests per order requisition was inversely associated with MARR (r = -0.90, p < 0.001). Finally, the number of years since licensure was modestly but significantly associated with MARR (r = 0.28, p < 0.001). Conclusion: This is the first and largest study to apply the MARR in an ED setting. As a metric, MARR effectively identifies differences in test ordering practices on per-test and per-hospital bases, which could be useful for data-informed practice optimization.

System performance tests and start transient analysis of a liquid rocket engine turbopump

2012 ◽  
Vol 227 (3) ◽  
pp. 470-480
Author(s):  
Soon-Sam Hong ◽  
Dae-Jin Kim ◽  
Jin-Sun Kim ◽  
Jinhan Kim
Keyword(s):  
Rocket Engine ◽  
Hydrogen Gas ◽  
Liquid Oxygen ◽  
Test Results ◽  
Gas Generator ◽  
Fuel Pump ◽  
Performance Requirements ◽  
Component Test ◽  
Liquid Rocket ◽  
Model Fluids

This article describes a series of development tests of a turbopump, which can be applied to a gas generator cycle rocket engine with liquid oxygen and kerosene propellants. A turbine drives both an oxidizer pump and a fuel pump in the turbopump assembly. In the tests, liquid oxygen and kerosene are supplied to the oxidizer pump and the fuel pump, respectively, while either cold hydrogen gas or hot gas from the gas generator is supplied to the turbine. The turbopump is operated reliably at both on-design and off-design conditions, meeting all the performance requirements. The test results are compared with those of the turbopump component tests, where model fluids are used, that is, water for the oxidizer pump and the fuel pump, and cold air for the turbine. The turbopump tests results agree well with the turbopump component test results. The speed buildup of the turbopump at start period is calculated when pressurized gas is used to initially spin the turbine. A differential equation which represents the torque balance between the turbine and the pumps is solved. The calculation shows a good agreement with the test result. When the mechanical loss of the turbopump is considered, a better estimation is obtained.

The Assembly and Measurement of Corrector Lens of a Cassegrain Telescope

2014 ◽  
Vol 625 ◽  
pp. 339-345
Author(s):  
Po Han Huang ◽  
Ming Ying Hsu ◽  
Ting Ming Huang ◽  
Ren Jyue Guo ◽  
Jhih Yang Lin ◽  
...  
Keyword(s):  
Low Cost ◽  
Optical Component ◽  
Field Of View ◽  
Test Results ◽  
Design Data ◽  
Air Space ◽  
Key Issues ◽  
Lens Assembly ◽  
Cassegrain Telescope ◽  
Vibration Tests

Corrector lens assembly is used to expand the field of view of a Cassegrain Telescope. There are usually three to five lenses in it. For the assembly of such a kind of high precision optics, decenter and tilt of each optical component and air space between components are key issues to be qualified. In the present study, four lenses were designed. Individual control of centering of the component and air space were achieved by assembling the component into a precision machined subcell. The lens positions were defined by precision spacers according to the designed values. To compensate various thermal expansions of glass and metal, elastomer material was used. Considering the deviation of manufacturing from design data, manufactured data were put into optical software for re-optimization, and air spaces between lenses were obtained. This gives excellent accuracy at low cost. Base on present lens mounting design and lens manufacturing quality, centering error was eliminated by lateral adjustment, which leaded to a good alignment. In this paper, the method for aligning the optics with the barrel assembly is presented and centering error measured by a double autocollimator is listed. In addition, test results of thermal cycling and vibration tests on the corrector lens assembly are discussed.

scholarly journals Determination of Turbine Stage Performance for an Automotive Power Plant

1957 ◽  
Author(s):  
L. B. Mann ◽  
A. H. Bell ◽  
G. W. Thebert
Keyword(s):  
Experimental Investigation ◽  
Power Plant ◽  
Test Procedure ◽  
Test Facility ◽  
Test Results ◽  
Turbine Stage ◽  
Component Test ◽  
Stage Performance ◽  
Working Parameters

The experimental investigation of turbine-stage performance in a component test facility is presented. The test variables are combined into working parameters and these are used to develop a convenient test procedure. Fixture equipment, specialized instrumentation and the related methods are discussed. Test results from a typical automotive turbine stage are presented.

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