scholarly journals Probability justification for a minimum margin of safety when calculating ship machine parts and endurance mechanisms

2020 ◽  
pp. 110-115
Author(s):  
В.К. Румб
Keyword(s):  
Safety Factor ◽  
Modern Technology ◽  
Fundamental Difference ◽  
Large Share ◽  
Strength Factor ◽  
Endurance Strength ◽  
Margin Of Strength ◽  
Margin Of Safety ◽  
Machine Parts ◽  
Minimum Margin

Расчеты прочности при проектировании и создании современной техники являются одним из главных критериев качества и конкурентоспособности изделий машиностроения. Неотъемлемой частью расчета прочности на выносливость является оценка минимально допустимого запаса прочности. Существующая оценка этого запаса на основе данных по отказам деталей несет в себе большую долю субъективизма. Предлагается методика определения минимально допустимого коэффициента запаса прочности. Ее принципиальное отличие от существующих заключается в том, что здесь этот коэффициент запаса прочности подсчитывается с учетом рассеяния характеристик прочности детали и действующих в ней напряжений при заданной вероятности отсутствия усталостного разрушения. Это позволяет исключить многие условности при прогнозировании прочностной надежности деталей и создает предпосылки для получения проектных решений, оптимальных по прочности и массе. Strength calculations in the design and creation of modern technology are one of the main criteria for the quality and competitiveness of engineering products. An integral part of the endurance strength calculation is the assessment of the minimum allowable margin of strength. The existing assessment of this stock, based on data on the failure of parts, carries a large share of subjectivism. It is proposed a method of determining the minimum allowable safety factor. Its fundamental difference from the existing one is that here this strength factor is calculated taking into account the scattering of the characteristics of the strength of the part and the stresses in it at a given probability of absence of fatigue destruction. This eliminates many conventions when predicting the strength of the reliability of parts and creates the prerequisites for obtaining design solutions that are optimal in strength and mass.

Tire Design Methodology Based on Safety Factor to Satisfy Tire Life (Simulation Approach to Truck and Bus Tire Design)

2005 ◽  
Vol 33 (4) ◽  
pp. 195-209 ◽  
Author(s):  
K. Kabe ◽  
K. Rachi ◽  
N. Takahashi ◽  
Y. Kaga
Keyword(s):  
Safety Factor ◽  
Strain Field ◽  
Design Methodology ◽  
Experimental Fact ◽  
Fiber Reinforced ◽  
Breaking Strain ◽  
Rubber Part ◽  
Low Modulus ◽  
Margin Of Safety ◽  
Different Strains

Abstract A tire is not only simply made of rubber, but also twisted cord, which we can call FRR (Fiber Reinforced Rubber). The rubber in FRR is made of many materials, including rubber compound, carbon black, silica, and other materials. FRR is a double composite material, which means a particle reinforced material in a microscopic view and also a fiber reinforced one in a macroscopic view. Therefore, it is very difficult to apply fracture mechanics to the evaluation of tire durability on a practical tire design level. This paper gives a proposal for a new design methodology considering the actual tire condition which gives tire profile growth and rubber aging due to heat build-up under operation. These two issues are especially important for truck and bus tire design. Tire profile growth is a very important one because the change of tire profile induces different strains in the rubber at the same location in the tire during its life. We apply the FEM (Finite Element Modeling) based Double Inflation Pressure (DIP) method to simulate the experimental fact of the change of tire profile. In order to use the relationship between the change of the tire profile and change of rubber properties, like breaking strain in the tire as service time passes, the concept of safety factor is introduced. The low modulus rubber parts in the tire dominate the strain field and allow the large deformations of the tire. Safety factors derived from the strain field are called “Margin of Safety.” On the other hand, the durability of FRR, like the belt layer and carcass layer with the cord part, is evaluated by stress because the FRR part reacts to the stress of the internal pressure and load of the tire. But, the Margin of Safety of the rubber part is more important because the cord part has enough safety factor in comparison with the rubber part. Tire life is predicted with the Margin of Safety described above.

scholarly journals Use of the Safety Factor and Margin of Safety in Motorcyclist Accident Risk Management

2018 ◽  
Vol 9 (4) ◽  
pp. 737
Author(s):  
Don Gaspar Noesaku da Costa ◽  
Siti Malkhamah ◽  
Latif Budi Suparma
Keyword(s):  
Risk Management ◽  
Safety Factor ◽  
Accident Risk ◽  
Margin Of Safety

Study and Design of Lawn Brush Cutter

2014 ◽  
Vol 971-973 ◽  
pp. 736-739
Author(s):  
Qiu Lei Du ◽  
Xiao Wei Jiang ◽  
Li Ai Pan
Keyword(s):  
Safety Factor ◽  
Environmentally Friendly ◽  
Low Noise ◽  
Bevel Gear ◽  
Spiral Bevel Gear ◽  
Gear Cutting ◽  
Cutting Machine ◽  
Reliable Performance ◽  
Machine Parts ◽  
Design Mechanism

Based on the survey of existing brush cutter and the analysis of the known conditions, this paper mainly studied design mechanism and principle of brush cutter, and carried on calculation and calibration of spiral bevel gear cutting machine parts, so as to ensure that the design of brush cutter is safe, efficient, simple, comfortable and environmentally friendly. Product after research is of reliable performance, convenient operation, low noise and zero smoke and higher safety factor, making it get more extensive application in the industry.

scholarly journals Pediatric Safety of Polysorbates in Drug Formulations

Children ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Christina Kriegel ◽  
Matthias Festag ◽  
Ravuri S.K. Kishore ◽  
Dieter Roethlisberger ◽  
Georg Schmitt
Keyword(s):  
Clinical Trials ◽  
Adverse Events ◽  
Safety Factor ◽  
Safety Assessment ◽  
Pediatric Patients ◽  
Safety Data ◽  
Young Patients ◽  
Drug Formulations ◽  
Margin Of Safety ◽  
Neonates And Infants

Polysorbates 20 and 80 are the most frequently used excipients in biotherapeutics, the safety data for which have been well documented in adults. The polysorbate content in therapeutic formulations that are administered to children, however, has been less clearly regulated or defined with regard to safety. In pediatric patients, excessive amounts of polysorbate in biotherapeutics have been linked to hypersensitivity and other toxicity-related effects. To determine safe levels of polysorbates for young patients, we have developed the progressive pediatric safety factor (PPSF), an age- and weight-based tool that estimates the amount of parenterally administered polysorbates 20 and 80 in formulations that will avoid excipient-related adverse events. Compared with existing modalities for calculating maximum acceptable doses of excipients for initial clinical trials in pediatrics, the PPSF is far more conservative, thus constituting an added margin of safety for excipient exposure in the most sensitive subpopulations—i.e., neonates and infants. Further, the PPSF may be applied to any relevant excipient, aiding pharmaceutical developers and regulatory authorities in conservatively estimating the safety assessment of a biotherapeutic’s formulation, based on excipient levels.

Exporting Perilous Pauline

2013 ◽  
Keyword(s):  
United States ◽  
The United States ◽  
Modern Technology ◽  
Fan Culture ◽  
Endurance Strength ◽  
Production Strategies ◽  
Narrative Patterns ◽  
Serial Films ◽  
Transitional Phase ◽  
India And China

Exceptionally popular during their time, the spectacular American action film serials of the 1910s featured exciting stunts, film tricks, and effects set against the background of modern technology, often starring resourceful female heroines who displayed traditionally male qualities such as endurance, strength, and authority. The most renowned of these “serial queens” was Pearl White, whose career as the adventurous character Pauline developed during a transitional phase in the medium's evolving production strategies, distribution and advertising patterns, and fan culture. This book explores how American serial films starring Pearl White and other female stars affected the emerging cinemas in the United States and abroad. The book investigates the serial genre and its narrative patterns, marketing, cultural reception, and historiographic importance, with chapters on Pearl White's life on and off the screen as well as the “serial queen” genre in Western and Eastern Europe, India, and China.

THE INFLUENCE OF SURFACE LAYER QUALITY ON THE PERFORMANCE CHARACTERISTICS OF MACHINE PARTS UNDER MACHINING

Tribologia ◽  
2018 ◽  
Vol 271 (1) ◽  
pp. 23-29
Author(s):  
Vyacheslav F. BEZYAZYCHNY ◽  
Marian SZCZEREK
Keyword(s):  
Surface Layer ◽  
Quality Parameters ◽  
Operating Conditions ◽  
Performance Characteristics ◽  
Endurance Strength ◽  
Machine Parts ◽  
Surface Layer Quality ◽  
The Impact

The paper highlights the classification of the quality parameters of the surface layer and their influence on the performance characteristics of machine parts, such as wear resistance, long-term and endurance strength, as well as the influence of quality parameters of the surface layer on the performance characteristics subject to the operating conditions (various temperatures and loads). The paper expounds the impact of machining conditions on the formation of surface layer quality indices and provides calculated dependences for the determination of surface layer quality parameters.

Socio-demographic influences on language structure and change: Not all learners are the same

2016 ◽  
Vol 39 ◽  
Author(s):  
Till Bergmann ◽  
Rick Dale ◽  
Gary Lupyan
Keyword(s):  
Adult Learners ◽  
Large Share ◽  
Demographic Differences ◽  
Language Structure

AbstractThe Now-or-Never bottleneck has important consequence for understanding why languages have the structures they do. However, not addressed by C&C is that the bottleneck may interact with who is doing the learning: While some languages are mostly learned by infants, others have a large share of adult learners. We argue that such socio-demographic differences extend and qualify C&C's thesis.

Organotin Compounds in Modern Technology

1985 ◽  
Vol 4 (9) ◽  
pp. 1696-1696
Author(s):  
Harry Meinema
Keyword(s):  
Modern Technology ◽  
Organotin Compounds

Integrative therapy in patients with intermittent claudication

VASA ◽  
2015 ◽  
Vol 44 (2) ◽  
pp. 85-91
Author(s):  
Erich Minar
Keyword(s):  
Intermittent Claudication ◽  
Modern Technology ◽  
Walking Distance ◽  
Interventional Treatment ◽  
Therapeutic Concept ◽  
Integrative Therapy ◽  
Risk Factor Modification ◽  
Supervised Exercise ◽  
Main Challenge ◽  
Exercise Programmes

The generally accepted first-line treatment in patients with intermittent claudication is risk factor modification, medical treatment and exercise training. In an era of reduced resources, the benefit of any further invasive intervention must be weighted against best conservative therapy for patients with claudication. According to some recent trials an integrative therapeutic concept combining best conservative treatment - including (supervised) exercise therapy - with endovascular therapy gives the best midterm results concerning walking distance and health-related quality of life. The improved mid- and long-term patency rate with use of modern technology further supports this concept. The conservative and interventional treatment strategy are more complimentary than competitive. The current main challenge is to overcome the economic barriers concerning the availability of exercise programmes.

Sign in / Sign up

Export Citation Format

Share Document