Reliability Analysis of Minnesota’s Unbonded Concrete Overlay Performance

2020 ◽  
Vol 2674 (9) ◽  
pp. 617-626
Author(s):  
Bernard Igbafen Izevbekhai ◽  
Norma Farah ◽  
Glenn M. Engstrom
Keyword(s):  
Service Life ◽  
Reliability Analysis ◽  
Network Reliability ◽  
Location Parameter ◽  
Pavement Management ◽  
Time To Failure ◽  
Weibull Analysis ◽  
Explanatory Variables ◽  
Current Decay ◽  
Threshold Time

Minnesota Department of Transportation (MnDOT) has studied pavement performance associated with various interventions in the road network. In this study, unbonded overlay, a major concrete pavement intervention known for its long service life, was examined. Curve fitting was performed, including a comparison of the current decay curves with previous patterns toward a default performance curve, stepwise regression to identify performance variables associated with and predictive of remaining service life (RSL), and reliability (Weibull) analysis to examine the reliability and other performance characteristics of unbonded overlay in the Minnesota network. Reliability analysis resulted in a RSL (scale parameter) of 36 years, which was reasonably consistent with the 35.5 year RSL derived from the MnDOT Highway Pavement Management Analysis (HPMA). It also provided evidence that the unbonded overlay displays an end-of-life failure pattern as well as a 7-year threshold time to failure (location parameter). MnDOT’s sigmoidal decay model predicted the same expected service life (35.5 years) as did the Weibull analysis process (35.8 years). Stepwise linear regression showed a positive correlation between the time from the most recent rehabilitation (TTR_MR) and RSL. The other explanatory variables including RQI_Spike and time from original construction to intervention (TTR) were found to be non-significant in the prediction of RSL.

scholarly journals Modelling Reliability Characteristics of Technical Equipment of Local Area Computer Networks

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 955
Author(s):  
Vasyl Teslyuk ◽  
Andriy Sydor ◽  
Vincent Karovič ◽  
Olena Pavliuk ◽  
Iryna Kazymyra
Keyword(s):  
Large Scale ◽  
Computer Network ◽  
Network Reliability ◽  
Local Area ◽  
Technical Equipment ◽  
Time To Failure ◽  
Reliability Parameters ◽  
Reliability Characteristics ◽  
Global World ◽  
Level 2

Technical systems in the modern global world are rapidly evolving and improving. In most cases, these are large-scale multi-level systems and one of the problems that arises in the design process of such systems is to determine their reliability. Accordingly, in the paper, a mathematical model based on the Weibull distribution has been developed for determining a computer network reliability. In order to simplify calculating the reliability characteristics, the system is considered to be a hierarchical one, ramified to level 2, with bypass through the level. The developed model allows us to define the following parameters: the probability distribution of the count of working output elements, the availability function of the system, the duration of the system’s stay in each of its working states, and the duration of the system’s stay in the prescribed availability condition. The accuracy of the developed model is high. It can be used to determine the reliability parameters of the large, hierarchical, ramified systems. The research results of modelling a local area computer network are presented. In particular, we obtained the following best option for connecting workstations: 4 of them are connected to the main hub, and the rest (16) are connected to the second level hub, with a time to failure of 4818 h.

Dependability Analysis of Homogeneous Distributed Software/Hardware Systems

2015 ◽  
Vol 22 (02) ◽  
pp. 1550007
Author(s):  
G. Vijayalakshmi
Keyword(s):  
Reliability Analysis ◽  
Distributed System ◽  
Failure Time ◽  
Load Sharing ◽  
Accelerated Failure Time Model ◽  
Time To Failure ◽  
Critical Systems ◽  
Time Model ◽  
Distributed Software ◽  
Dependability Analysis

With the increasing demand for high availability in safety-critical systems such as banking systems, military systems, nuclear systems, aircraft systems to mention a few, reliability analysis of distributed software/hardware systems continue to be the focus of most researchers. The reliability analysis of a homogeneous distributed software/hardware system (HDSHS) with k-out-of-n : G configuration and no load-sharing nodes is analyzed. However, in practice the system load is shared among the working nodes in a distributed system. In this paper, the dependability analysis of a HDSHS with load-sharing nodes is presented. This distributed system has a load-sharing k-out-of-(n + m) : G configuration. A Markov model for HDSHS is developed. The failure time distribution of the hardware is represented by the accelerated failure time model. The software faults are detected during software testing and removed upon failure. The Jelinski–Moranda software reliability model is used. The maintenance personal can repair the system up on both software and hardware failure. The dependability measures such as reliability, availability and mean time to failure are obtained. The effect of load-sharing hosts on system hazard function and system reliability is presented. Furthermore, an availability comparison of our results and the results in the literature is presented.

scholarly journals Reliability Analysis of Water Distribution Subsystem

2008 ◽  
Vol 7 (4) ◽  
pp. 307-326
Author(s):  
Zimoch Izabela
Keyword(s):  
Reliability Analysis ◽  
Recovery Time ◽  
Water Distribution ◽  
Probability Of Failure ◽  
Time To Failure ◽  
Mean Time To Failure ◽  
Research Results ◽  
Availability Factor ◽  
Mean Time

Reliability Analysis of Water Distribution Subsystem This paper presents results of detailed reliability analysis of water distribution subsystem operation of Krakow city. Basis of the research was wide base of information of occurred failures during exploitation (1996-2006). These analysis included evaluation of basic factors such as: failure and renovation intensities, mean recovery time and mean time to failure, availability factor and probability of failure-free operation at any time. Moreover, it was performed wide analysis of failure capability of pipes as a function of its diameter and material. The paper consists also of research results of occurred piping failures reasons and consequences.

Reliability Analysis of High Gain Integrated DC–DC Topologies for Xenon Lamp Applications

2019 ◽  
Vol 28 (10) ◽  
pp. 1950168
Author(s):  
Divya Navamani ◽  
K. Vijayakumar ◽  
Jason Manoraj
Keyword(s):  
Reliability Analysis ◽  
Input Voltage ◽  
High Gain ◽  
Working Environment ◽  
Reliability Prediction ◽  
Xenon Lamp ◽  
Time To Failure ◽  
High Efficient ◽  
Switched Mode Power Supplies ◽  
Converter Topologies

Emerging switched-mode power supplies incorporated applications demand reliable, less volume and high efficient dc–dc converters. The persistent usage of the dc–dc converters in various applications makes their reliability a significant concern. Hence, this paper deals with a family of non-isolated high gain integrated dc–dc converter topologies derived from a quadratic converter. The reliability analysis is carried out using electronic equipment reliability handbook, MIL-HDBK-217F. For the first time, reliability prediction is done based on the working environment of the power electronic equipments. We developed the reliability prediction for the converters used in the lighting application such as automotive headlamp and aircraft landing lights. The mean time to failure for both the environment is calculated. The reliability comparison is carried out for the proposed topologies and the most reliable converter is chosen. Also, all the converter topologies are simulated using nL5 simulator to confirm their theoretical results. Finally, a laboratory prototype for 40 W with input voltage of 12 V is implemented for the most reliable topology to validate the steady-state analysis.

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