A Technique for Accelerating Block Load Fatigue Programmes

1977 ◽  
Vol 19 (5) ◽  
pp. 193-201 ◽  
Author(s):  
E. M. Power
Keyword(s):  
Fatigue Damage ◽  
Analytical Method ◽  
Counting Methods ◽  
Valuable Method ◽  
Lower Load ◽  
Service Loading ◽  
Selection Of

Recent improvements in cycle counting methods have increased the value of the block load programme as a method of simulating the fatigue damage caused by random service loading. It has already been observed that some of the lower load levels in certain block programmes make insignificant contributions to the total fatigue damage, and that the elimination of such levels can provide a very valuable method of accelerating tests. This paper presents further evidence in support of this observation, and proposes an analytical method by which the damage significance of each block may be predicted, thus enabling a rapid selection of those levels which may be safely omitted.

Comparative study of four greenness assessment tools for selection of greenest analytical method for assay of hyoscine N-butyl bromide

2021 ◽  
Author(s):  
Mohammed Gamal ◽  
Ibrahim A. Naguib ◽  
Dibya Sundar Panda ◽  
Fatma F. Abdallah
Keyword(s):  
Comparative Study ◽  
Analytical Method ◽  
Assessment Tools ◽  
Butyl Bromide ◽  
Selection Of

The competencies of four greenness assessment tools were tested. AGREE is the best greenness tool while NEMI is the poorest one. AGREE, GAPI, and ESA are reliable greenness tools.

Determination of morphine and its metabolites in the biological samples: an updated review

Bioanalysis ◽  
2020 ◽  
Vol 12 (16) ◽  
pp. 1161-1194
Author(s):  
Roghayeh Amini ◽  
Elaheh Rahimpour ◽  
Abolghasem Jouyban
Keyword(s):  
Analytical Method ◽  
Biological Samples ◽  
Opioid Analgesic ◽  
Individual Variability ◽  
Active Metabolites ◽  
Analytical Research ◽  
Reliable Analytical Method ◽  
Selection Of

Morphine (MO) as an opioid analgesic is used for the treatment of moderate-to-severe pains, particularly cancer-related pains. Pharmacologic studies on MO are complicated due to drugs binding to the protein or metabolization to active metabolites, and even inter-individual variability. This necessitates the selection of a reliable analytical method for monitoring MO and the concentrations of its metabolites in the biological samples for the pharmacokinetic or pharmacodynamic investigations. Therefore, this study was conducted to review all the analytical research carried out on MO and its metabolites in the biological samples during 2007–2019 as an update to the study by Bosch et al. (2007).

scholarly journals Optimal observational planning of local GPS networks: assessing an analytical method

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
H. Mehrabi ◽  
B. Voosoghi
Keyword(s):  
Global Positioning System ◽  
Analytical Method ◽  
Cost Reduction ◽  
Operational Research ◽  
Field Work ◽  
Programming Algorithm ◽  
Positioning System ◽  
Global Positioning ◽  
Gps Networks ◽  
Selection Of

AbstractPrecision, reliability and cost are the major criteria applied in optimization and design of geodetic networks. The terrestrial networks are being replaced quickly by permanent and campaign Global Positioning System (GPS) networks. These networks must be optimized using the same three criteria. In this article the optimization of the observational plan of local GPS networks (Second Order Design (SOD)) is considered using the precision criterion. This study is limited to the selection of optimal numbers and the best distribution of the non-trivial baselines throughout the network. This objective is accomplished based on the SOD solution through the analytical method in operational research by the means of quadratic programming algorithm. This presented method is tested on a real GPS network and appears to be a useful technique in terms of cost reduction in the field work by the provided observational plan and optimal distribution of the baselines throughout the network. Results indicate that weights of almost 36% of the baselines are negligiblewhen compared to the weights of the rest of the baselines; therefore, they could be eliminated fromthe observational plan, resulting in a 36% saving in the fieldwork cost.

scholarly journals A universal, damage-criterion-independent cycle counting method for multiaxial and variable amplitude fatigue

2019 ◽  
Vol 300 ◽  
pp. 17004
Author(s):  
K.G. F. Janssens
Keyword(s):  
Fatigue Damage ◽  
Fatigue Loading ◽  
Multiaxial Fatigue ◽  
Mean Stress ◽  
Counting Method ◽  
Damage Criterion ◽  
Variable Amplitude ◽  
Counting Procedure ◽  
Counting Methods ◽  
Set Up

None of the procedures for cycle-counting defined in the ASTM document with designation E1049-85 (Reapproved 2017) [1] are generally applicable to non-proportional, multi-axial Fatigue. In addition, as the concepts of amplitude and mean stress are defined per cycle, their values are dependent (or co-define) the cycle counting method. This poses an obvious problem to the analysis of non-proportional, multi-axial fatigue damage, as lifetime is, not in all but in many cases, an amplitude and mean stress dependent material property. Most of the newer cycle counting methods developed till date are at least inspired by the works of Wang & Brown [2] and of Bannantine & Socie [3], both of which are themselves still frequently used. Being built inspired by counting methods developed for uniaxial cycling, all of the approaches to date known to this author are limited in a way that is very well phrased by Anes et al [4], whom, on page 79 of their article, write that (quote): The damage criterion is the base stone to set up random fatigue. The damage parameter must capture the fatigue damage behavior to allow set up a cycle counting method and an accumulation model. Challenging this statement, a new cycle counting procedure is presented that is completely independent of the damage criterion, and universally works from the simplest uniaxial experiment, to the most complex, variable amplitude and frequency, non-proportional multiaxial fatigue loading. The definition of this new cycle counting concept is surprisingly simple. Despite of its simplicity, the new cycle counting procedure has different advantages when compared to the procedures known to date. Its standalone definition, allows it to be combined with any damage criterion. It does not require periodicity of the loading cycle, and can therefore be straightforwardly used to analyze variable frequency and amplitude, multiaxial fatigue loading.

scholarly journals Quantitation of Phenolic Compounds Related to Antioxidant and Antiosteoporosis Activities in Ripe and Unripe Maesil (Prunus mume)

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Chong Woon Cho ◽  
Young Sik Park ◽  
Xi-Tao Yan ◽  
Hyun June Kim ◽  
Young Ho Kim ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Analytical Method ◽  
Northeast Asia ◽  
Herbal Medicines ◽  
Prunus Mume ◽  
Harvesting Time ◽  
Valuable Source ◽  
Ancient Times ◽  
Unripe Fruits ◽  
Selection Of

The fruits of Prunus mume, maesil (Rosaceae), have been widely used as a valuable source of foods and herbal medicines from ancient times in Northeast Asia. Specially, phenolic compounds of main compounds in maesil were reported to have various activities. This study aims to develop the simultaneous analytical method of nine phenolic compounds in maesil and to evaluate these compound contents in samples during the ripeness. Twenty-one species of samples and nine phenolic compounds were used for this study. In results, compounds 1–9 contents in unripe fruits were 0.16∼1.81 mg/g. However, these compounds in ripe samples were 0.09∼1.66 mg/g. Compounds 1–9 contents in ripe fruits were generally reduced rather than those in unripe fruits. Otherwise, the contents of compounds 2, 5, 8, and 9 in seed part were relatively higher than those in flesh part. In contrast, contents of compounds 1, 3, and 7 in flesh part were relatively higher than those in seed part. Generally, the contents of compounds 1–9 in unripe fruits were higher than those in ripe fruits. However, the contents of compounds 1–9 in each part (seed and fresh) of fruits were different according to species of compounds. It indicates that the selection of harvesting time and process part of fruits as the source of foods and medicines is important.

Analytical Method of Fatigue Damage Estimation for Compressor Stator Blades of Gas Turbines Experiencing Rotating Stall

2002 ◽  
Author(s):  
Yasushi Hayasaka ◽  
Shigeo Sakurai ◽  
Takeshi Kudo ◽  
Kunihiro Ichikawa
Keyword(s):  
Stress Analysis ◽  
Fatigue Damage ◽  
Analytical Method ◽  
Gas Turbines ◽  
Estimation Method ◽  
Rotating Stall ◽  
Environmental Data ◽  
Response Analysis ◽  
Damage Estimation ◽  
Stress Peak

To improve the reliability of compressor stator blades of gas turbines, an analytical method for estimating their fatigue damage has been developed. This method is based on blade-vibratory-stress analysis, stress-peak counting, and use of actual environmental data. The blade-vibratory-stress analysis takes the superposition of multi-peaks of the stress spectrum into account. The numerically simulated stress showed better agreement with measured stress than that from a conventional stress analysis, which is based on frequency-response analysis considering a single peak of the lowest single eigen-vibration-mode. A time-domain stress history was synthesized from the blade-vibratory-stress analysis results. Furthermore, the fatigue damage of the blade under rotating stall was estimated by the linear-damage-rule from the stress-peak counting of the stress and from material data. The estimated fatigue-damage agrees well with the measured results. This agreement means that our new fatigue-damage-estimation method is more accurate than the conventional one.

Analysis of Residual, Thermal, and Loading Stresses in a B33 Wheel and Their Relationship to Fatigue Damage

1967 ◽  
Vol 89 (2) ◽  
pp. 249-258 ◽  
Author(s):  
J. P. Bruner ◽  
G. N. Benjamin ◽  
D. M. Bench
Keyword(s):  
Fatigue Damage ◽  
Fatigue Tests ◽  
Loading Conditions ◽  
Test Results ◽  
Iron And Steel ◽  
Service Loading ◽  
Stress Patterns ◽  
Resultant Stress ◽  
Superposition Principles ◽  
Made In

The current General Electric computer study sponsored by The American Iron and Steel Institute, discussed at the ASME Railroad Division 1965 Winter Meeting, has the objective of determining the most favorable geometric configuration to minimize service stresses. This present investigation involves the corollary problem of service loading conditions that produce the highest stresses and the possibility of fatigue damage. Static loading, rim heating, residual stress measurements, and fatigue tests were made in the laboratory on representative B33 wheels. A series of simulated loading conditions was studied and the resulting stresses combined by simple superposition principles. The resultant stress patterns were compared with fatigue test results using the modified Goodman relationship. In this way the service loading conditions that produce fatigue damage may be predicted.

scholarly journals Pengembangan Sumber Belajar Berbasis Karakter Peserta Didik (Ikhtiar optimalisasi Proses Pembelajaran Pendidi-kan Agama Islam (PAI))

Nadwa ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 175
Author(s):  
M sahran Jailani
Keyword(s):  
Analytical Method ◽  
Learning Objectives ◽  
Islamic Education ◽  
Learning Material ◽  
Learning Resources ◽  
Individual Study ◽  
Context Of Learning ◽  
Selection Of ◽  
The Way

<p>This article aims to reveal the theoretical academic studies in the context of learning resources as epicentrum valuable information for each individual study. This paper uses descriptive analytical method. The results of this study indicate that the source of learning was instrumental in providing a range of information and knowledge required to develop skills and compe-tencies. The way to develop learning resources of Islamic education in order to optimally conducted by 1) analyzing the needs and characteristics of stu-dents' learning, 2) formulate learning objectives, 3) the development of learning material, 4) developing tools to measure the progress, 5) selection of learning resources and 6) hold evaluation.<br /> <br /><strong>Abstrak</strong><br />Artikel ini bertujuan mengungkap secara teoritis kajian akademik dalam konteks sumber belajar sebagai epicentrum informasi yang berharga bagi setiap manusia yang belajar. Penulisan ini menggunakan metode deskriptif analitis. Hasil kajian ini menunjukkan bahwa sumber belajar sangat berperan dalam menyediakan berbagai informasi dan pengetahuan yang diperlukan dalam mengembangkan berbagai kompetensi yang diinginkan. Adapun cara mengembangkan sumber belajar Pendidikan Agama Islam agar optimal dilakukan dengan 1) menganalisis kebutuhan dan karakteristik belajar siswa, 2) merumuskan tujuan pembelajaran, 3) pengembangan materi pembelajaran, 4) mengembangkan alat ukur keberhasilan, 5) pemilihan jenis sumber belajar dan 6) mengadakan evaluasi.</p>

scholarly journals Determination of the optimal curvature of the turnout diverging track for HSR using dynamic analysis

2017 ◽  
Vol 2017 (10) ◽  
pp. 1-11
Author(s):  
Władysław Koc ◽  
Katarzyna Palikowska
Keyword(s):  
Dynamic Analysis ◽  
Analytical Method ◽  
High Speed ◽  
Extreme Points ◽  
Point Of View ◽  
High Speed Railway ◽  
Zero Values ◽  
Linear And Nonlinear ◽  
Selection Of

The paper presents an analytical method of identifying the curvature of the turnout diverging track consisting of sections of varying curvature. Such turnout is mainly applied on High Speed Railway. Both linear and nonlinear (polynomial) curvatures of the turnout diverging track are considered in the paper. Obtained solutions enable to assume curvature values at the beginning and end point of the geometrical layout of the turnout.The paper focus on a fundamental and unexplained so far issue connected with selection of the most favourable curvature section from the operational requirements point of view. In order to determine the optimal curvature a dynamic analysis has been carried out on the several representative cases. It has been indicated that, used in railway practice, clothoid sections with nonzero curvatures at the beginning and end points of the turnout should be verified. It has been proved that the turnout with nonlinear curvature reaching zero values at the extreme points of the geometrical layout is the most favourable.

scholarly journals Theoretical and methodological approaches of visual sociology in the study of gender

2021 ◽  
Vol 7 (4) ◽  
pp. 392-401
Author(s):  
Elvira V. Bushkova-Shiklina ◽  
Ksenia I. Odegova
Keyword(s):  
Content Analysis ◽  
Gender Roles ◽  
Qualitative Analysis ◽  
Focus Groups ◽  
Video Surveillance ◽  
Analytical Method ◽  
Visual Analysis ◽  
Visual Sociology ◽  
Methodological Approaches ◽  
Selection Of

One way to comprehend social reality is to watch animation films and animation series that broadcast gender models. In connection with the changes taking place in modern ideas about gender, it will be relevant to study gender roles that function in modern animation cinema. The purpose of the article is to study the theoretical and methodological approaches of visual sociology, used in the study of gender, for further selection of the most optimal methods in the study of gender models broadcast in modern animation cinema. Based on the system-analytical method, an overview of the degree of development of the problems of visual analysis of gender is made; the definitions of the concept of "gender" are considered. The authors believe that the most relevant will be the understanding of gender as a system of sociocultural norms constructed by society, which represent a number of characteristics and can be fixed by the methods of visual sociology. The main approaches of visual sociology are systematized: psychoanalytic, socio-critical, deconstructionist, hermeneutic, semiotic, (post)structuralist and discursive. The most correct methods of visual analysis in the study of gender (video surveillance, photo and video interviews, content analysis) have been substantiated. The authors conclude that for a qualitative analysis of gender problems in animated cinema, it is necessary to use classical methods of visual sociology in combination with additional methods of sociology (hermeneutic analysis, semiotic interpretation, focus groups).

Sign in / Sign up

Export Citation Format

Share Document