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Wyświetlanie 16-30 z 936
Tytuł:
Applying the Anticipatory Failure Determination at a Very Early Stage of a System’s Development: Overview and Case Study
Autorzy:
Chybowski, L.
Gawdzińska, K.
Souchkov, V.
Powiązania:
https://bibliotekanauki.pl/articles/2065020.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
complex technical system
anticipatory failure determination
AFD
anticipatory failure analysis
AFA
failure prediction
Theory of Inventing Problem Solving
TRIZ
Opis:
Anticipatory Failure Determination (AFD) is a tool used in the TRIZ (Theory of Inventive Problem Solving) methodology. This article introduces its concept and describes the process of AFD in different versions of the method. The article presents the application of the AFD method at a very early state of a system’s development, i.e. its concept formulation stage, which corresponds to a technology readiness level (TRL) equal to 2. The system under analysis is a set of devices used to reduce displacement ship hull resistance. The system was modelled using functional analysis. An analysis of system resources was then carried out. Possible direct, indirect, and accident-related failures were identified. A multi-criteria analysis of the causes of system failures was conducted from which the top 10 potential failures were selected. Observations were made on the applicability of AFD in respect to systems not yet implemented.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 205--215
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane aspekty kosztów oraz awaryjności przewodów przykładowego systemu wodociągowego
Selected Issues of Costs and Failure of Pipes in an Exemplary Water Supply System
Autorzy:
Pietrucha-Urbanik, K.
Studziński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1817993.pdf
Data publikacji:
2016
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
sieć wodociągowa
awaryjność
koszty
intensywność uszkodzeń
water network
failure
cost
failure rate
Opis:
The aim of the study is to analyze cost and failures of water pipes. The analysis was conducted on the basis of operational data of the failure of the water supply network pipes, obtained from the water supply company. In the analysis, the indicator of failure rate for different types of water pipes (mains, distributional pipes and water supply connections) was accounted for. The analysis of the failure of water supply pipes in connection to the diameter, age and material was presented in the paper. The analysis can be applied in operational practice in water companies, particularly in the analysis related to the costs of pipe repairs, which consists in estimating the cost of repair work. Material composition of water supply system constitutes mainly PE and steel pipes. The new pipes are built mainly of PE. The regular replacement of cast iron pipes is noted, because of their high failure rate, which indicates that these pipes have reached the end of life technology. The obtained failure rate values were referred to the ones recommended by European criteria, as it should not exceed 0,3 failure/km a for mains, 0,5 failure/km a for distributional pipes and 1,0 failure/km a for water supply connections. In the case of distributional pipes, the failure rate exceeds the criteria and in the case of water supply connections and distributional pipes, the observed values are lower than the limit value. Repair of mains constitute 39% of all costs due to the large diameter pipes and the associated higher cost of the material. Lower total cost is related to failures, which occur on distributional pipes (23.8%) and fittings of water supply network (3.7%). The total cost of operating employees constitutes the highest of all costs. The costs incurred for materials are lower of 9.2%. Labour costs are higher than the costs of equipment by 3.6%. The data can be complementary to the national database in this area and allow to carry out a satisfactory assessment of the water supply network, taking into account both the network failure rate, as well as the tendency of changes in material supply network pipes. Despite numerous studies in the field of water supply system failure, there is still a need of conducting further study, such situation is affected by the ongoing changes in the age and structure of water supply networks. The collected data and conducted analysis can be one of the decisive indicators for the policy of operation of water supply systems.
Źródło:
Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 2; 616-627
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test Signal Design for Failure Detection: a Linear Programming Approach
Autorzy:
Scola, H. R.
Nikoukhah, R.
Delebecque, F.
Powiązania:
https://bibliotekanauki.pl/articles/908093.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
failure detection
large scale programming
failure isolation
bounded perturbations
active detection
Opis:
A new methodology for the design of filters that permits failure detection and isolation of dynamic systems is presented. Assuming that the normal and the faulty behavior of a process can be modeled by two linear systems subject to inequality bounded perturbations, a method for the on-line implementation of a test signal, guaranteeing failure detection, is proposed. To improve the fault detectability of the dynamic process, appropriate test signals are injected into the system. All the computations required by the proposed method are implemented as the solution of large sparse linear optimization problems. A simple numerical example is given to illustrate the proposed procedure.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 4; 515-526
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Awaryjność ścianowych kombajnów węglowych na przykładzie KSW-475-/BP i KSW-460/NZ
Failure frequency of the longwall coal shearers machine with regard to KSW-475/2BP and KSW-460/NZ
Autorzy:
Profaska, M.
Bielak, M.
Powiązania:
https://bibliotekanauki.pl/articles/113524.pdf
Data publikacji:
2016
Wydawca:
STE GROUP
Tematy:
kombajn ścianowy
identyfikacja uszkodzeń
diagnozowanie uszkodzeń
longwall coal shearer
failure detection
failure diagnosis
Opis:
W publikacji przedstawiono uszkodzenia ścianowych kombajnów węglowych KSW 475/2BP oraz KSW-460/NZ pracujących w porównywalnych warunkach górniczo-geologicznych. Podjęto problematykę związaną z uszkodzeniami mechanicznymi oraz awariami układu hydraulicznego, najciekawsze z nich zostały przeanalizowane szczegółowo. Analizie poddane zostaną również sposoby diagnozowania, usuwania oraz przyczyny powstawania awarii.
This article presents damages of longwall coal shearers: KSW 475/2BP and KSW-460/NZ working in comparable geological and mining conditions. The following paper reports issue of mechanical failures and hydraulic system problems, the most interesting of them were elaborated. What was also analyzed were methods of diagnosing and troubleshooting and the causes of failures.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2016, 2 (14); 278-286
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Device Failure in the Mechanical Production Plant
Autorzy:
Sitko, J.
Mikuš, R.
Božek, P.
Powiązania:
https://bibliotekanauki.pl/articles/2064943.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
plant
failure
analysis
repair
quality
Opis:
The article evaluates the failure rate of devices in the Mechanical Processing Plant using a traditional quality tool, the Pareto-Lorenzo diagram. A comparative analysis of failure rates was performed, recorded in repair, inspection and maintenance card. Then, changes were proposed in order to reduce failure rates and earlier detection of equipment malfunctions. In order to analyze the failure rate of grain washer equipment during thick coal preparation process, one quality management tools was used - the Pareto-Lorenzo diagram. In this case, it is important to assess the mechanical failure of devices, and demonstrating which devices generate most repairs. Based on materials made available by the mine, such as: Repair, inspection and maintenance cards, Device cards, DTR documentation. Quantitative and qualitative assessment the most frequently occurring mechanical failures during operation of devices in process enrichment of coarse sizes was carried out. An attempt was made to assess failure rate of devices on a grain washer. A comparative analysis of failure rates in 2015-2017 recorded in the repair, inspection and maintenance card was carried out. Then, changes were proposed to stand, in order reduce failure rates, and earlier detection equipment malfunctions.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 93--99
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of the FMEA method in the analysis and assessment of technical systems safety
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Szpak, D.
Powiązania:
https://bibliotekanauki.pl/articles/2068740.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
FMEA
risk
safety
failure analysis
Opis:
The analysis and assessment of the protection of technical system was performed using the FMEA method (Failure Mode and Effect Analysis). The FMEA method allows the product or process to be analysed, to identify weak points, and then introduce corrections and new solutions to eliminate sources of undesirable events. The developed methodology was presented on the example.
Źródło:
Journal of Polish Safety and Reliability Association; 2018, 9, 3; 95--100
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Percepcja ryzyka niepowodzenia zawodowego wśród studentów
Perception the Risk of Professional Failure Among Students
Autorzy:
Wódz, Jacek
Szczepańska-Woszczyna, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/920307.pdf
Data publikacji:
2018-12-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
luck
failure
student
occupation job
Opis:
The author reflects on the risk of professional failure among students. He believes that in this case we have a vague definition of professional failure. He indicates both causes, those independent of humans and those related to their own actions or negligence. Then he refers to the category of occupation and its place in times of uncertainty. Pointing to the factors determining the perception of the risk of professional failure, he emphasizes the role of the University, which gives support to its students in the process of their professional risk assessment.
Źródło:
Studia Edukacyjne; 2018, 51; 287-308
1233-6688
Pojawia się w:
Studia Edukacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Significance of education and self-management support for patients with chronic heart failure in family physician practice
Autorzy:
Korzh, Oleksii
Krasnokutskiy, Sergiy
Powiązania:
https://bibliotekanauki.pl/articles/551603.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
education
heart failure
self-management.
Źródło:
Family Medicine & Primary Care Review; 2016, 4; 432-436
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of semiautonomy mode for ibis mobile robot with analysis of sensor failure tolerance
Autorzy:
Bartoszek, J.
Trojnacki, M.
Bigaj, P.
Powiązania:
https://bibliotekanauki.pl/articles/384614.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
sensor failure
mobile robot
semiautonomy
Opis:
This work is concerned on sensitivity analysis of semiautonomy algorithm of mobile combat robot to environmental sensors' damage. The construction of the robot, semiautonomy algorithm and used sensors have been described. This algorithm takes into account environmental sensors’ damage. Simulation research results of semiautonomy algorithm using Matlab/Simulink package was presented. This research was performed for normal environmental sensors’ operation and for selected sensors' damage. On that basis, sensitivity of semiautonomy algorithm to selected environmental sensors damage was tested.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2011, 5, 4; 3-10
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of costs of repairs of undesirable events occurring in a municipal bus transportation system
Autorzy:
Bojar, P.
Woropay, M.
Migawa, K.
Szubartowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/247304.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport system
collision
devastation
failure
Opis:
Systems of public transport carry out their tasks on the territory of a given town and in the suburbs performing the same functions as in towns. A distinctive feature of this type of system is performance of its task for twenty four hours, in different traffic intensity conditions over an assigned administrative area. This type of variables has a large influence on occurrence of undesirable events (failure of vehicles and their devastation, collision and accidents). In the work, an attempt of identification of undesirable events occurring in the analyzed transport system has been made. Moreover, an analysis has been made which covers one day of the week, time of the day and weather conditions in which particular events took place. Another aspect of the work was to make an analysis of the vehicle driver's age, job experience and a given hour of work on the day of the event occurrence. Obtainment of such data allowed demonstrating the structure of events according to the criterion of the event type, and costs connected with bringing the damaged transport means to the state of serviceability. The obtained results of experimental tests provide a basis for taking rational decisions by decision makers employed in a given system. These decisions are supposed to reduce the number of undesirable events occurrence and costs connected with them.
Źródło:
Journal of KONES; 2011, 18, 4; 19-24
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression profile of circulating microRNAs in patients with ischemic heart failure with moderately reduced left ventricular ejection fraction – pilot study
Autorzy:
Kaufmann, Damian
Daniłowicz-Szymanowicz, Ludmiła
Sakowicz-Burkiewicz, Monika
Szwoch, Małgorzata
Pawełczyk, Tadeusz
Raczak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/895765.pdf
Data publikacji:
2019-02-05
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
heart failure
circulating microRNAs
biomarkers
Opis:
Introduction: Heart failure (HF) is a growing global pandemic that affects millions of people around the world. Despite the progress in medicine, diagnosis and treatment of HF remains problematic. Recently, noncoding micro ribonucleic acids called miRNAs have become significant in the diagnosis and stratification of HF risk. Aim: The aim of this study was the attempt to identify the profile of circulating miRNAs specific for ischemic HF with moderately reduced left ventricular ejection fraction (HFmrEF). Methods and Results: A number of changes in the miRNA profile can characterise patients with ischemic HFmrEF. This is a pilot study before further research on a larger group of patients. Conclusions: Using the quantitative reverse transcription-polymerase chain reaction (qRT-PCR), serum levels of 84 miRNA were measured and compared between a patient with ischemic HFmrEF and a healthy volunteer. Analysis reveals a down-regulation of let-7f-5p and miR-1-3p, as well as up-regulation of miR-100-5p, miR-10b-5p, miR-125a-5p, miR-140-5p, miR-144-3p, miR-149-5p, miR-15b-5p, miR-183-5p, miR-208b-3p, miR-224-5p, miR-26b-5p, miR-27b-3p, miR-302a-3p, miR-320a, miR-7-5p, miR-99a-5p.
Źródło:
European Journal of Translational and Clinical Medicine; 2018, 1, 2; 53-57
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prolonged renal failure in the course of atypical ethylene glycol intoxication
Autorzy:
Liberek, Tomasz
Śliwarska, Julita
Czurak, Krzysztof
Perkowska-Ptasińska, Agnieszka
Weber, Ewa
Rutkowski, Bolesław
Powiązania:
https://bibliotekanauki.pl/articles/1039462.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
ethylene glycol
intoxication
renal failure
Opis:
Ethylene glycol poisoning is not an uncommon cause of an acute renal injury. In this paper we present case of prolonged renal failure in the course of ethylene glycol intoxication. Due to the low dose of ingested ethylene glycol and concomitant ethanol consumption, the neurodepressive phase of the intoxication was rather mild and patient presented to the hospital on the ninth day after poisoning with established renal failure. The diagnosis of the specific cause of renal injury was facilitated by the renal biopsy.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 661-663
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selected strain-based failure criteria on ship structure damage resulting from a collision with an offshore wind turbine monopile
Autorzy:
Niklas, Karol
Bera, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/2033234.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship
collision
monopile
failure
crashworthiness
Opis:
Offshore wind farms are developing well all over the world, providing green energy from renewable sources. The evaluation of possible consequences of a collision involves Finite Element computer simulations. The goal of this paper was to analyse the influence of selected strain-based failure criteria on ship damage resulting from a collision with an offshore wind turbine monopile. The case of a collision between an offshore supply vessel and a monopile-type support structure was examined. The results imply that simulation assumptions, especially the failure criteria, are very important. It was found that, using the strain failure criteria according to the minimum values required by the design rules, can lead to an underestimation of the ship damage by as much as 6 times, for the length of the hull plate, and 9 times, for the area of the ship hull opening. Instead, the adjusted formula should be used, taking into account both the FE element size and the shell thickness. The influence of the non-linear representation of the stress-strain curve was also pointed out. Moreover, a significant influence of the selected steel grade on collision damages was found.
Źródło:
Polish Maritime Research; 2021, 4; 42-52
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A topological model to assess networks connectivity and reliability
Autorzy:
Eid, M.
Hami-EL, A.
Souza de Cursi, E.
Powiązania:
https://bibliotekanauki.pl/articles/2069197.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
network
connectivity
failure
reliability
availability
Opis:
The acceleration of the interconnectivity of networks of all sorts brings to the front scene the issue of networks performance measure. Recently, one observed an accelerating course towards quantitative probabilistic models to describe and assess networks’ Connectivity, as being the main vector of performance. However, modelling realistic networks is still far from being satisfactorily achieved using quantitative probabilistic models. On the other hand, little room had been lift to exploring the potential of topological models to develop qualitative and semi- quantitative models in order to assess networks connectivity. In this paper, we are exploring the potential of the topological modelling. The proposed model is based on describing the nodepair connectivity using binary scalars of different orders (tensors). Preliminary results of our explorations sounded very promoting.
Źródło:
Journal of Polish Safety and Reliability Association; 2013, 4, 2; 167--178
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for identifying threats of critical infrastructure systems within Baltic Sea region
Autorzy:
Tchórzewska-Cieślak, Barbara
Pietrucha-Urbanik, Katarzyna
Szpak, Dawid
Powiązania:
https://bibliotekanauki.pl/articles/2068699.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
failure
system safety
safety management
risk
security
threats
FMEA
safety
failure analysis
Bayes network
Opis:
In the analysis of the operation of critical infrastructure systems it is important to perform the analysis of the safety of the operation. The daily operation of such systems is inherently associated with the occurrence of various types of random undesirable events. Therefore, in the paper the matrix and logical trees methods used in the analysis of the risk of threats in critical infrastructure systems within the Baltic Sea, were presented. The analysis and assessment of the protection of technical system was performed using the FMEA method (Failure Mode and Effect Analysis). As to analyse the cause and effect of undesirable events the method of Bayes' theorem and Java Bayes program were implemented, which allows to identify the probability of the event occurrence.
Źródło:
Journal of Polish Safety and Reliability Association; 2019, 10, 1; 149--166
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 16-30 z 936

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