Building very high reliability into the design and manufacture of relays

2006 ◽  
Author(s):  
S. Richards
Keyword(s):  
High Reliability ◽  
Design And Manufacture ◽  
Very High

Second Paper: Failure-Survival Automatic Flight Control Systems for Aircraft with Particular Reference to a High Reliability Electrohydraulic Actuator

1965 ◽  
Vol 180 (1) ◽  
pp. 246-259
Author(s):  
R. Ruggles
Keyword(s):  
Control System ◽  
Control Systems ◽  
Flight Control ◽  
High Reliability ◽  
Supply System ◽  
Design Criteria ◽  
Flight Control System ◽  
Advantages And Disadvantages ◽  
System Configurations ◽  
Very High

The author discusses some of the problems of failure-survival automatic flight control systems and suggests some basic ground rules as design criteria. The advantages and disadvantages of some of the main types of system are discussed: duplex, triplex, triple component, duplicate-monitored and quadruplex systems being covered. In particular, a quadruplex actuator is described which has been designed and developed mainly for automatic flight control system applications where a very high degrees of failure-survival capability is required. A detailed failure analysis of the various systems is carried out and the importance of the electrical and hydraulic supply system configurations and failure rates is brought out.

Development of a Letter Coding Desk

1969 ◽  
Vol 184 (8) ◽  
pp. 166-177
Author(s):  
S. C. Knowles
Keyword(s):  
High Reliability ◽  
Future Trends ◽  
Design Features ◽  
Operating Personnel ◽  
Large Numbers ◽  
Letter Code ◽  
Very High

The development of the letter code desk is described, particular reference being made to the necessity for the characteristics to be suited to the operating personnel. An explanation is given of the design features introduced as a result of this unit being required in relatively large numbers for this class of work. The development of the special printing unit for code application is described, with particular emphasis on the very high reliability required. An indication is given of probable future trends.

scholarly journals Karakteristik Hydrocyclone untuk Pemisahan Minyak dan Air

2020 ◽  
Vol 4 (2) ◽  
pp. 133
Author(s):  
Dian Ratna Suminar ◽  
Nurcahyo Nurcahyo
Keyword(s):  
High Water ◽  
Petroleum Exploration ◽  
Pipe Diameter ◽  
High Water Content ◽  
Optimum Flow Rate ◽  
Cylindrical Section ◽  
Overflow Pipe ◽  
Design And Manufacture ◽  
Very High ◽  
Optimum Flow

Eksplorasi minyak bumi dari sumur-sumur yang sudah tua menghasilkan minyak dengan kandungan air tinggi. Hydrocyclone suatu alat yang berfungsi untuk pemisahan cair-cair berdasarkan perbedaan berat jenis setiap komponen. Pemisahan ini terjadi dikarenanakan adanya gaya sentrifugal dan gaya gravitasi yang dihasilkan dari bentuk hydrocyclone yang seperti kerucut. Perancangan dan pembuatan hydrocyclone menghasilkan alat dengan spesifikasi sebagai berikut : diameter pipa masukan : 25,4 mm, diameter cylindrical section : 120 mm, tinggi cylindrical section : 120 mm, tinggi cone section : 600 mm, diameter pipa overflow : 25,4 mm, diameter pipa underflow : 25,4 mm. Laju alir optimum untuk pemisahan air-minyak tanah pada hydrocyclone adalah 91,8 liter/menit dengan kadar minyak tanah di overflow sebesar 11,4% dan kadar minyak tanah di underflow sebesar 3%.Petroleum exploration from old wells produces oil with a very high water content. Hydrocyclone is a device that functions for liquid-liquid separation based on differences in specific gravity of each component. This separation occurs due to the presence of centrifugal forces and gravitational forces resulting from cone-like forms of hydrocyclone. The design and manufacture of hydrocyclone produces tools with the following specifications: input pipe diameter: 25.4 mm, cylindrical section diameter: 120 mm, high cylindrical section: 120 mm, cone section height: 600 mm, overflow pipe diameter: 25.4 mm, underflow pipe diameter: 25.4 mm. The optimum flow rate for the separation of water-kerosene on hydrocyclone is 91.8 liters / minute with the level of kerosene in overflow of 11.4% and the level of kerosene in underflow of 3%.

scholarly journals The peril of adjusting for baseline when using change as a predictor

2019 ◽  
Author(s):  
Kimmo Sorjonen ◽  
Daniel Falkstedt ◽  
Bo Melin ◽  
Michael Ingre
Keyword(s):  
High Risk ◽  
Sample Size ◽  
Simulation Study ◽  
Strong Correlation ◽  
High Reliability ◽  
Large Sample Size ◽  
Present Simulation ◽  
Very High ◽  
Time Point

Some studies have analyzed the effect of a predictor measured at a later time point (X1), or of the X1-X0 difference, while adjusting for the predictor measured at baseline (X0), on some outcome Y of interest. The present simulation study shows that, if used to analyze the effect of change in X on Y, there is a high risk for this analysis to produce type 1-errors, especially with a strong correlation between true X and Y, when X0 and X1 are not measured with very high reliability, and with a large sample size. These problems are not encountered if analyzing the unadjusted effect of the X1-X0 difference on Y instead, and as this effect exhibits power on par with the adjusted effect it seems as the preferable method when using change between two measurement points as a predictor.

New Generation of Brake Callipers to Improve Competitiveness and Energy Savings in Very High Performance Cars

2014 ◽  
Vol 217-218 ◽  
pp. 471-480
Author(s):  
Ivano Gattelli ◽  
Gian Luigi Chiarmetta ◽  
Marcello Boschini ◽  
Renzo Moschini ◽  
Mario Rosso ◽  
...  
Keyword(s):  
High Pressure ◽  
High Performance ◽  
Energy Savings ◽  
High Reliability ◽  
A357 Alloy ◽  
Bench Tests ◽  
Heat Treated ◽  
New Generation ◽  
Non Destructive ◽  
Very High

This paper concerns with the optimisation of the innovative rheocasting process to produce a new generation of brake callipers, characterised by very high reliability and strength. The attained very promising properties favoured their use on a very high performance car and the presented technique can be further extended for other important challenging applications. The prototype components are produced using T6 heat treated A357 alloy. Results on the samples machined directly from the produced callipers are in detail described and analysed. Pieces exhibiting some small defects, individuated by non-destructive tests, as well as defectless pieces have been underlined to severe industrial tests, e.g. high pressure tight, as well as severe bench tests, and it has been observed that the proposed technological process assure the fulfilment of the requirements contained in standards.

scholarly journals Test UHCJ20m—Measurement Procedure Standardization and Metric Characteristics Determination

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3971
Author(s):  
Aleš Dolenec ◽  
Ivan Milinović ◽  
Vesna Babić ◽  
Dražan Dizdar
Keyword(s):  
Research Study ◽  
High Reliability ◽  
Intraclass Correlation ◽  
Measurement Procedure ◽  
Future Research ◽  
Maximum Speed ◽  
Sports Events ◽  
Jump Test ◽  
The Subject ◽  
Very High

The purpose of the research study was to standardize the measurement procedure and determine the reliability, homogeneity, and sensitivity of a 20 m unilateral horizontal cyclic jump test (UHCJ20m) whose intentional (assumed) measurement aim is the lower extremities’ explosive strength. The subject sample consisted of 31 students from Zagreb University (20.68 ± 1.96 years of age, height 185.16 ± 7.19 cm, body mass 79.48 ± 9.23 kg) actively involved in various sports events. The UHCJ20m test was performed three times using a dominant (take-off) leg with an active rest of 15 min between the repetitions. The results showed that the UHCJ20m test had satisfactory sensitivity and a very high reliability: Cronbach α = 0.95, intraclass correlation coefficient (ICC) = 0.94 and homogeneity average intertrial correlation (AVR) = 0.88. Future research studies should be aimed at determining the metric characteristics of the UHCJ20m test with a population of athletes in sports characterized by start acceleration and maximum speed running.

scholarly journals Instruments Development of Tri Kaya Parisudha-Based Countenance Model in Evaluating the Blended Learning

2019 ◽  
Vol 9 (5) ◽  
pp. 55
Author(s):  
Dewa Gede Hendra Divayana ◽  
Agus Adiarta ◽  
I Gede Sudirtha
Keyword(s):  
Blended Learning ◽  
High Reliability ◽  
Content Validation ◽  
Evaluation Tool ◽  
Validation Process ◽  
Study Approach ◽  
Analysis Technique ◽  
Teachers And Students ◽  
Very High ◽  
Test Process

This study intended to develop the Countenance model evaluation instruments that were integrated with the Tri Kaya Parisudha concept as a blended learning evaluation tool for Tourism Vocational Schools in Gianyar Regency. This study approach was the instrument development, by several development stages, including evaluation components determination, evaluation aspects determination, instrument items determination, instrument items trial, instrument items analysis, and final items determination. The instruments which were used in data collection were questionnaires and documentation. Subjects those were involved in instrument trial on the content validation process were two experts (experts in informatics engineering education and educational evaluation), while the reliability testing process were 48 respondents (teachers and students). The instruments analysis technique during the content validation process used the Gregory formula, while during the reliability test process using the Cronbach Alfa formula. This study produced 122 items with very high validity and very high reliability categories, as evidenced by the r-scores of 0.938 and 0.961, respectively.

Robust Gas Turbine Design

2002 ◽  
Author(s):  
Bernard Becker
Keyword(s):  
Gas Turbines ◽  
High Reliability ◽  
Operating Experience ◽  
Turbine Rotor ◽  
Operational Reliability ◽  
Design Features ◽  
Industry Standard ◽  
Industrial Gas Turbines ◽  
Turbine Design ◽  
Very High

Industrial gas turbines utilize numerous design features that cannot be implemented in jet aircraft turbines for weight reasons, but because of their straight-forward and robust nature trim costs and reduce both maintenance effort and operating risks. Regardless of manufacturer, the following design features, for example, have become the established industry standard: • single-shaft rotor; • 2 bearings at atmospheric pressure; • Journal bearing instead of ball bearings; • steel blading in the compressor. For the key components compressor, turbine, rotor, and combustion chamber of its 3A family (Fig. 1), Siemens has developed and tested additional features that reduce wear further and improve operational reliability. Operating experience gathered to date has shown that these features enable achievements of very high reliability and availability. Some of the measures described also contribute to enhanced output and efficiency.

Operational fault-tolerant microcomputer for very high reliability

1983 ◽  
Vol 130 (3) ◽  
pp. 90 ◽  
Author(s):  
Mashkuri Yaacob ◽  
M.G. Hartley ◽  
P.G. Depledge
Keyword(s):  
Fault Tolerant ◽  
High Reliability ◽  
Very High
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