scholarly journals Reliability Analysis of Weighted- k-out-of- n: G System Consisting of Two Different Types of Nonidentical Components Each with its Own Positive Integer-Valued Weight

2020 ◽  
Author(s):  
Eisa Mahmoudi ◽  
RahmatSadat Meshkat
Keyword(s):  
Positive Integer ◽  
Reliability Analysis ◽  
Different Types

The Strength Evaluation and Reliability Analysis of Periodic Symmetric Struts Support

2011 ◽  
Vol 462-463 ◽  
pp. 1164-1169
Author(s):  
Jing Xiang Yang ◽  
Ya Xin Zhang ◽  
Mamtimin Gheni ◽  
Ping Ping Chang ◽  
Kai Yin Chen ◽  
...  
Keyword(s):  
Distribution Function ◽  
Probability Distribution ◽  
Stress Distribution ◽  
Least Squares ◽  
Reliability Analysis ◽  
Least Squares Method ◽  
Nonlinear Least Squares ◽  
Distribution Model ◽  
Different Types ◽  
Nonlinear Least Squares Method

In this paper, strength evaluations and reliability analysis are conducted for different types of PSSS(Periodically Symmetric Struts Supports) based on the FEA(Finite Element Analysis). The numerical models are established at first, and the PMA(Prestressed Modal Analysis) is conducted. The nodal stress value of all of the gauss points in elements are extracted out and the stress distributions are evaluated for each type of PSSS. Then using nonlinear least squares method, curve fitting is carried out, and the stress probability distribution function is obtained. The results show that although using different number of struts, the stress distribution function obeys the exponential distribution. By using nonlinear least squares method again for the distribution parameters a and b of different exponential functions, the relationship between number of struts and distribution function is obtained, and the mathematical models of the stress probability distribution functions for different supports are established. Finally, the new stress distribution model is introduced by considering the DSSI(Damaged Stress-Strength Interference), and the reliability evaluation for different types of periodically symmetric struts supports is carried out.

scholarly journals Source Harmonic Reduction using Passive Filter in Different Non-Linear Loaded Conditions

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3347-3356
Keyword(s):  
Positive Integer ◽  
Transmission Lines ◽  
Output Signal ◽  
Supply Voltage ◽  
Electrical System ◽  
Harmonic Reduction ◽  
Passive Filters ◽  
Different Types ◽  
Non Linear

Harmonics in general are defined as positive integer multiples of the fundamental frequency, which dominate an electrical system due to the presence of linear and non-linear components which include transformers, inductors, capacitors, long transmission lines also occur due to effects such as the Corona Effect. Harmonics also occur due to the presence of active loads, transmission phenomenon and base vectors. The presence of harmonics within a circuit causes the distortion of the generated waveforms of the supply voltage or frequency. This enables complete distortion of the output signal and waveforms. This article is an intricate case study on the designing procedure of different types of passive filters and their simulated results, used for the harmonics reduction at the source side considering different types of load at the receiving end, covering a wide area of distortion due to ambidextrous properties

Investigation and Reliability Analysis of Fifteen Level Asymmetrical Multilevel Inverter Topology using Nearest Level Control Technique with low Component Count

2020 ◽  
Vol 13 ◽  
Author(s):  
Abeera Dutt Roy ◽  
Chandrahasan Umayal
Keyword(s):  
Reliability Analysis ◽  
Electronic Devices ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Control Technique ◽  
Level Control ◽  
Multilevel Inverters ◽  
Different Types ◽  
Performance Abilities ◽  
Inverter Topology

Background:: In multilevel inverters (MLI) as the number of level increases, there is a proportionate increase in the count of the semiconductor devices that are employed. Methods:: An asymmetrical multilevel inverter topology using a bidirectional switch is presented which employs lesser number of power electronic devices to produce fifteen levels at the output voltage. Nearest Level modulation (NLM) technique is used to generate the switching pulses and reliability analysis is performed using Markov reliability methodology. The operating principle of the proposed MLI and its performance abilities is verified through MATLAB/Simulink and a prototype is developed to provide the experimental results. Results:: Total Harmonic Distortion (THD) is computed for proposed MLI for different types of loads in simulation environment as well as in the developed hardware prototype. The fifteen level is achieved by using only 9 switches and 3 DC sources in comparison to the 28 switches and 6 DC sources required by the traditional cascaded H-bridge inverter. Conclusion:: The simulation and hardware results confirm the suitability of the proposed fifteen level MLI as the total component count and the requirement of DC sources reduces considerably.

scholarly journals Reliability Analysis of High Rise Building Considering Wind Load Uncertainty

2018 ◽  
Vol 4 (3) ◽  
pp. 469
Author(s):  
Yi Zhang ◽  
Keqin Yan ◽  
Tao Cheng
Keyword(s):  
Reliability Analysis ◽  
Wind Load ◽  
Engineering Structures ◽  
Safety Measures ◽  
High Rise ◽  
High Rise Building ◽  
Different Types ◽  
Reliability Methods ◽  
Wind Load Uncertainty ◽  
Distribution Type

In engineering structures, the safety problems are always depending on the respond of structures to different types of load. The safety assessment of a high rise building is highly depending on the analysis of environmental load. Many codes and practices have proposed many requirements for engineers in the design works. These include safety factors, limitations on damage, maximum deflections and so on. When violations in these requirements occur, the structure is believed to be dangerous. But once the problem becomes complicated such as multiple unknown loads in one building, it requires reliability analysis in the design. It must take care of all the assumptions and uncertainties in the structural design. In probabilistic assessment, any input variable is considered as an uncertainty. However, the traditional way to deal with these problems may have problems when uncertainties are large. Many probabilistic safety measures need to be reconsidered in engineering work. This paper, we will provide reliability analysis on a high rise building with consideration of wind load. All the most commonly applied reliability methods are been utilized in this analysis and compared base on the performance. The statistical influences including correlation and distribution type are also discussed in the same reliability problem.

scholarly journals A Simple Guide to Inter-rater, Intra-rater and Test-retest Reliability for Animal Behaviour Studies

2021 ◽  
Author(s):  
Naomi D Harvey
Keyword(s):  
Reliability Analysis ◽  
Reliability Assessment ◽  
Animal Behaviour ◽  
Reliability Study ◽  
Retest Reliability ◽  
Different Types ◽  
Test Retest Reliability

This paper outlines the main points to consider when conducting a reliability study in the field of animal behaviour research and describes the relative uses and importance of the different types of reliability assessment: inter-rater, intra-rater and test-retest. Whilst there are no absolute methods under which reliability studies should be analysed or judged, this guide highlights the most common methods for reliability analysis along with recommendations and caveats for how the results should be chosen and interpreted. It is hoped that this guide will serve to improve the quality of, and reporting of, reliability studies in animal behaviour research through aiding both the researchers themselves, and reviewers of their manuscripts.

Reliability Analysis of DKNCP Systems with a Mixture of Degrading Components Subjected to Different Types of Shocks

2018 ◽  
Vol 25 (04) ◽  
pp. 1850019
Author(s):  
Somayeh Hamed Ranjkesh ◽  
Ali Zeinal Hamadani
Keyword(s):  
Reliability Analysis ◽  
High Performance ◽  
Failure Mechanisms ◽  
System Operation ◽  
Component Failure ◽  
Different Types ◽  
Natural Degradation ◽  
Random Shocks ◽  
Specific Number ◽  
Random Amount

This paper attempts to model the reliability of dynamic k-out-of-n systems with component partnership (DKNCP) in which a mixture of deteriorating components and multiple types of shocks are inflicted on the system. Previous studies were merely focused on the DKNCP systems affected by one type of shock that influenced all its components. In practice, however, shocks do not necessarily affect all the components. Hence, shocks may be classified based on their magnitude, specifications, and the components they affect. In this paper, random shocks are classified into distinct sets based on the components affected. DKNCP or adaptive KNCP is a new redundancy system that can be applied when a specific number of high-performance components is required which cannot be replaced by lower-performance components even if the number of these components is high. In a DKNCP system, the components contribute to the system operation in different ways and can make partnership groups for the system to survive when a component failure occurs. Also, we consider two failure mechanisms: accumulating degradation and random shocks. Two types of random shocks are also considered in the model: critical shocks, that cause instantaneous component failure, and non-critical ones, that increase natural degradation by a random amount.

scholarly journals On uniformly fully inert subgroups of abelian groups

2020 ◽  
Vol 8 (1) ◽  
pp. 5-27 ◽  
Author(s):  
Ulderico Dardano ◽  
Dikran Dikranjan ◽  
Luigi Salce
Keyword(s):  
Abelian Group ◽  
Positive Integer ◽  
Finite Index ◽  
Abelian Groups ◽  
Invariant Subgroup ◽  
Positive Answer ◽  
Natural Question ◽  
Direct Sum ◽  
Different Types ◽  
Dual Notion

AbstractIf H is a subgroup of an abelian group G and φ ∈ End(G), H is called φ-inert (and φ is H-inertial) if φ(H) ∩ H has finite index in the image φ(H). The notion of φ-inert subgroup arose and was investigated in a relevant way in the study of the so called intrinsic entropy of an endomorphism φ, while inertial endo-morphisms (these are endomorphisms that are H-inertial for every subgroup H) were intensively studied by Rinauro and the first named author.A subgroup H of an abelian group G is said to be fully inert if it is φ-inert for every φ ∈ End(G). This property, inspired by the “dual” notion of inertial endomorphism, has been deeply investigated for many different types of groups G. It has been proved that in some cases all fully inert subgroups of an abelian group G are commensurable with a fully invariant subgroup of G (e.g., when G is free or a direct sum of cyclic p-groups). One can strengthen the notion of fully inert subgroup by defining H to be uniformly fully inert if there exists a positive integer n such that |(H + φH)/H| ≤ n for every φ ∈ End(G). The aim of this paper is to study the uniformly fully inert subgroups of abelian groups. A natural question arising in this investigation is whether such a subgroup is commensurable with a fully invariant subgroup. This paper provides a positive answer to this question for groups belonging to several classes of abelian groups.

Reliability Analysis of Alternating Group Graphs and Split-Stars

2020 ◽  
Author(s):  
Mei-Mei Gu ◽  
Rong-Xia Hao ◽  
Jou-Ming Chang
Keyword(s):  
Positive Integer ◽  
Reliability Analysis ◽  
Connected Graph ◽  
Alternating Group ◽  
Edge Connectivity ◽  
Minimum Number ◽  
Disconnected Graph

Abstract Given a connected graph $G$ and a positive integer $\ell $, the $\ell $-extra (resp. $\ell $-component) edge connectivity of $G$, denoted by $\lambda ^{(\ell )}(G)$ (resp. $\lambda _{\ell }(G)$), is the minimum number of edges whose removal from $G$ results in a disconnected graph so that every component has more than $\ell $ vertices (resp. so that it contains at least $\ell $ components). This naturally generalizes the classical edge connectivity of graphs defined in term of the minimum edge cut. In this paper, we proposed a general approach to derive component (resp. extra) edge connectivity for a connected graph $G$. For a connected graph $G$, let $S$ be a vertex subset of $G$ for $G\in \{\Gamma _{n}(\Delta ),AG_n,S_n^2\}$ such that $|S|=s\leq |V(G)|/2$, $G[S]$ is connected and $|E(S,G-S)|=\min \limits _{U\subseteq V(G)}\{|E(U, G-U)|: |U|=s, G[U]\ \textrm{is connected}\ \}$, then we prove that $\lambda ^{(s-1)}(G)=|E(S,G-S)|$ and $\lambda _{s+1}(G)=|E(S,G-S)|+|E(G[S])|$ for $s=3,4,5$. By exploring the reliability analysis of $AG_n$ and $S_n^2$ based on extra (component) edge faults, we obtain the following results: (i) $\lambda _3(AG_n)-1=\lambda ^{(1)}(AG_n)=4n-10$, $\lambda _4(AG_n)-3=\lambda ^{(2)}(AG_n)=6n-18$ and $\lambda _5(AG_n)-4=\lambda ^{(3)}(AG_n)=8n-24$; (ii) $\lambda _3(S_n^2)-1=\lambda ^{(1)}(S_n^2)=4n-8$, $\lambda _4(S_n^2)-3=\lambda ^{(2)}(S_n^2)=6n-15$ and $\lambda _5(S_n^2)-4=\lambda ^{(3)}(S_n^2)=8n-20$. This general approach maybe applied to many diverse networks.

scholarly journals Reliability analysis of a two-unit standby system by computer simulation

2003 ◽  
Vol 13 (1) ◽  
pp. 85-94
Author(s):  
Tatjana Davidovic ◽  
Slobodanka Jankovic
Keyword(s):  
Computer Simulation ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Reliability Analysis ◽  
Preventive Maintenance ◽  
Explicit Formulas ◽  
Unit System ◽  
Different Types ◽  
Standby System

We study the two-unit standby system with repair and with preventive maintenance. Preventive maintenance is introduced in order to make the lifetime of the system longer. Using Monte-Carlo method we simulate the work of the two-unit system and we analyze the influence of different types of preventive maintenance on reliability of the system. Monte-Carlo method enables us to find estimates of various parameters relevant to the system for which there exist no explicit formulas in the literature. .

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