نتایج جستجو برای: failure prediction

تعداد نتایج: 616686  

2017
Xinnian Li Fengqi Li Shuyong Chen Yanan Li Qiang Zou Ziping Wu Shaobo Lin

Commutation failure is a common fault for line-commutated converters in the inverter. To reduce the possibility of commutation failure, many prediction algorithms based on alternating current (AC) voltage detection have already been implemented in high voltage direct current (HVDC) control and protection systems. Nevertheless, there are currently no effective methods to prevent commutation fail...

Journal: :تحقیقات مهندسی کشاورزی 0
علی ماشاءاله کرمانی استادیار پژوهش بخش تحقیقات فنی و مهندسی مرکز تحقیقات کشاورزی و منابع طبیعی قزوین تیمور توکلی هشتجین استاد دانشگاه تربیت مدرس سعید مینایی دانشیار دانشگاه تربیت مدرس

an understanding of the strength of rice grains as affected by moisture content and temperature is important for analysis and prediction of cracking and/or breakage behavior during handling and processing. further, the magnitude of these properties at various moisture contents and temperatures is needed for the accurate design of milling machinery so that grain damage is minimized. to determine...

Journal: :مدیریت زنجیره تأمین 0
سعید رمضانی علیرضا معینی

development of monitoring systems to fault detection, in offensive and defensive systems, uav, aircraft and other complex systems technically make it possible and favorable, predictive diagnosis of faults. health management model and predict equipment failures (phm) were created in recent years by formation a strong bond of science in engineering, computer and reliability. for this reason, more...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی برق 1386

یکی از دلایل اضافه ولتاژ، برخورد صاعقه به خط انتقال می باشد. صاعقه در صورت برخورد به سیم گارد و برخورد به فاز می تواند ایجاد خطر نماید. با برخورد صاعقه به سیم گارد، اضافه ولتاژ کمتری شاهد خواهیم بود. ازاینرو استفاده از سیم گارد در خطوط انتقال الزامی می باشد. اگر برخورد به سیم گارد باعث ایجاد back flashover شود، سیستم را دچار تنش خواهد کرد. در حالتی دیگر نیز اگر صاعقه به فاز برخورد نماید (sheild...

Journal: :journal of reproduction and infertility 0

failure to respond adequately to standard protocols and to recruit adequate follicles is called ‘poor response’. this results in decreased oocyte production, cycle cancellation and, overall, is associated with a significantly diminished probability of pregnancy. it has been shown that ovarian reserve tests, such as basal fsh, antimullarian hormone (amh), inhibin b, basal estradiol, antral folli...

Journal: :International Journal of Pressure Vessels and Piping 2021

The goal of this work is to predict ductile failure pipe-ring notched AISI 316L specimens, where notches mimic the geometry corrosion defects. Uncoupled damage models are used that end. Johnson-Cook and Lou-Huh criteria calibrated. uncoupled calibrated using experimental results from testing specimens. Calibration was achieved a hybrid experimental-numerical approach. Six notch shapes studied. ...

2007
Zhifeng Yu Chenjia Wang Weisong Shi

The goal of workflow application scheduling is to achieve minimal makespan for each workflow. Scheduling workflow applications in high performance computing environments, e.g., clusters, is an NP-Complete problem, and becomes more complicated when potential resource failures are considered. While more research on failure prediction has been witnessed in recent years to improve system availabili...

Journal: :Information & Software Technology 2013
Sandeep Krishnan Chris Strasburg Robyn R. Lutz Katerina Goseva-Popstojanova Karin S. Dorman

Context: Previous work by researchers on 3 years of early data for an Eclipse product has identified some predictors of failure-prone files that work well. Eclipse has also been used previously by researchers to study characteristics of product line software. Objective: The work reported here investigates whether classification-based prediction of failure-prone files improves as the product lin...

افسر, امیر, جعفرنژاد, احمد , صادقی مقدم, محمد رضا,

  With the emergence of predictive maintenance in 1980, radical changes took place in maintenance planning. Predictive maintenance depends on the prediction of facilities failure which are used at present. By predicting the failures correctly in future, we can decrease the cost of maintenance to a great extent. This approach involves using multiple techniques including artificial intelligence, ...

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