scholarly journals Reliability Analysis of Critical Kinematic Pair of the RD-33 Engine

2019 ◽  
Vol 49 (3) ◽  
pp. 547-574
Author(s):  
Karol Bogucki
Keyword(s):  
Reliability Analysis ◽  
Critical Pair ◽  
Power Balance ◽  
Technological Problem ◽  
Original Material ◽  
Kinematic Pair ◽  
Strength Criteria ◽  
Turbine Engine ◽  
In The Beginning

Abstract The article addressed the technological problem occurring in the RD-33 turbine engine on the kinematic pair between the accessory gearbox (AGB) and fuel regulator pump HP-59A (Polish: NR-59A). In the beginning, examples of operational problems were described. Then, the power balance for the accessory gearbox and strength calculations of gear and splines of a critical pair were presented. It was demonstrated that gear made from an original material complies with strength criteria and the observed operational problems with splines are created by other factors.

Paper 21: Planning for Failures

1969 ◽  
Vol 184 (2) ◽  
pp. 156-160
Author(s):  
R. H. W. Brook
Keyword(s):  
Reliability Analysis ◽  
Gas Turbine ◽  
Gas Turbine Engine ◽  
Failure Pattern ◽  
Management Decisions ◽  
Turbine Engine ◽  
The Cost ◽  
Service Data ◽  
Component Failures ◽  
Realistic Prediction

When a serious failure situation has developed, an expensive crash programme is usually required. If in-service data are analysed as a routine, then impending trouble may be foreseen and management decisions made to minimize the cost. A reliability analysis can help to establish a failure pattern compatible with intuitive engineering assessment so that, from a realistic prediction, alternative courses of action can be considered. A recent gas-turbine engine problem which has caused six component failures is analysed, and alternative replacement strategies are considered. It is suggested that to adopt the intuitive compromise strategy could be the most expensive in this case.

High Temperature Salt-Fog Corrosion Behavior of a Ni-Based Super Alloy

2011 ◽  
Vol 311-313 ◽  
pp. 662-665
Author(s):  
Ji Jie Wang ◽  
Jian Lan ◽  
Duy Gu Turan ◽  
Tong Cui ◽  
Da Jiang ◽  
...  
Keyword(s):  
High Temperature ◽  
Aging Time ◽  
Salt Solution ◽  
Turbine Engine ◽  
Long Time ◽  
Layer Increase ◽  
In The Beginning ◽  
Salt Fog Corrosion ◽  
Salt Fog ◽  
Super Alloy

Long time corrosion is carried out on a kind of new Ni-based super alloy used as a component of gas turbine engine, under salt-fog atmosphere at 700°C850°C for 200h. The salt solution component is 75% sodium sulfate plus 25% sodium chloride. The surface of the alloy was coated with salt solution at 150°C and aged at 700°C,750°C,800°C and 850°C for 10h, 50h, 100h and 200h, respectively. It is found that with the increase of temperature and aging time, the weight and thickness of the corrosion layer increase, and the corrosion becomes severer on the alloy surfaces. In the beginning of high-temperature corrosion, the corrosion speed increases quickly, and as prolong of corrosion aging time, corrosion speed turns to be invariable, and it is correlated to the formation of an oxidized layer by which the increasing of corrosion speed is restricted.

Drug Induced Changes in Cell Organelles

1968 ◽  
Vol 26 ◽  
pp. 110-111
Author(s):  
Sarah A. Luse
Keyword(s):  
Clinical Medicine ◽  
Cell Organelles ◽  
Riboflavin Deficiency ◽  
Drug Induced ◽  
New Era ◽  
Health And Disease ◽  
In The Beginning ◽  
Cellular Pathology ◽  
Induced Changes ◽  
The Impact

In the mid-nineteenth century Virchow revolutionized pathology by introduction of the concept of “cellular pathology”. Today, a century later, this term has increasing significance in health and disease. We now are in the beginning of a new era in pathology, one which might well be termed “organelle pathology” or “subcellular pathology”. The impact of lysosomal diseases on clinical medicine exemplifies this role of pathology of organelles in elucidation of disease today.Another aspect of cell organelles of prime importance is their pathologic alteration by drugs, toxins, hormones and malnutrition. The sensitivity of cell organelles to minute alterations in their environment offers an accurate evaluation of the site of action of drugs in the study of both function and toxicity. Examples of mitochondrial lesions include the effect of DDD on the adrenal cortex, riboflavin deficiency on liver cells, elevated blood ammonia on the neuron and some 8-aminoquinolines on myocardium.

A View of the Lexical–Grammatical Link in Young Latinos With Specific Language Impairment Using Language-Specific and Conceptual Measures

2019 ◽  
Vol 62 (6) ◽  
pp. 1775-1786 ◽  
Author(s):  
Lucía I. Méndez ◽  
Gabriela Simon-Cereijido
Keyword(s):  
Low Income ◽  
Language Impairment ◽  
Specific Language Impairment ◽  
L2 Acquisition ◽  
Cross Sectional ◽  
Specific Language ◽  
Vocabulary Skills ◽  
In The Beginning ◽  
Study Participants ◽  
L1 And L2

Purpose This study investigated the nature of the association of lexical–grammatical abilities within and across languages in Latino dual language learners (DLLs) with specific language impairment (SLI) using language-specific and bilingual measures. Method Seventy-four Spanish/English–speaking preschoolers with SLI from preschools serving low-income households participated in the study. Participants had stronger skills in Spanish (first language [L1]) and were in the initial stages of learning English (second language [L2]). The children's lexical, semantic, and grammar abilities were assessed using normative and researcher-developed tools in English and Spanish. Hierarchical linear regressions of cross-sectional data were conducted using measures of sentence repetition tasks, language-specific vocabulary, and conceptual bilingual lexical and semantic abilities in Spanish and English. Results Results indicate that language-specific vocabulary abilities support the development of grammar in L1 and L2 in this population. L1 vocabulary also contributes to L2 grammar above and beyond the contribution of L2 vocabulary skills. However, the cross-linguistic association between vocabulary in L2 and grammar skills in the stronger or more proficient language (L1) is not observed. In addition, conceptual vocabulary significantly supported grammar in L2, whereas bilingual semantic skills supported L1 grammar. Conclusions Our findings reveal that the same language-specific vocabulary abilities drive grammar development in L1 and L2 in DLLs with SLI. In the early stages of L2 acquisition, vocabulary skills in L1 also seem to contribute to grammar skills in L2 in this population. Thus, it is critical to support vocabulary development in both L1 and L2 in DLLs with SLI, particularly in the beginning stages of L2 acquisition. Clinical and educational implications are discussed.

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