scholarly journals Reliability Evaluation of Hinged Slab Bridge Considering Hinge Joints Damage and Member Failure Credibility

2020 ◽  
Vol 10 (14) ◽  
pp. 4824
Author(s):  
Guojin Tan ◽  
Qingwen Kong ◽  
Longlin Wang ◽  
Xirui Wang ◽  
Hanbing Liu
Keyword(s):  
System Reliability ◽  
Evaluation Method ◽  
Fuzzy Variable ◽  
Random Variable ◽  
Failure Criteria ◽  
Reliability Evaluation ◽  
Assessment Method ◽  
Copula Theory ◽  
Damage Degree ◽  
First Order Second Moment

The hinged slab bridge is widely used in medium- and small-span bridges because of its simple structure and convenient construction. However, hinge joints damage is the main defect of this kind of bridge, and it is difficult to express the deterministic damage degree of hinge joints in the detection process. A system reliability evaluation method considering fuzzy detection information of hinge joints damage and member failure credibility is proposed in this paper. Firstly, the membership function is used to quantitatively express the fuzzy detection information of hinge joints, and the fuzzy variable is transformed to an equivalent random variable. Secondly, the functional relationship between the transverse distribution coefficient and hinge joints damage is constructed by the modified hinge-jointed plate method and response surface method, and the reliability of the member considering the fuzzy detection information of hinge joints damage is calculated by the first-order second-moment method (FOSM). Then, the failure credibility is introduced to represent the different possibilities of system failure caused by member failure, and a system reliability assessment method of different failure criteria considering member failure credibility is established based on copula theory. Finally, the applicability of the proposed method is verified by taking the reinforced concrete hinged slab bridge as a numerical example.

Reliability Evaluation of Electromagnetic Flowmeter Based on Entropy Weight and Fuzzy Theory

2011 ◽  
Vol 383-390 ◽  
pp. 5321-5326
Author(s):  
Chun Yu Yu ◽  
Kai Li Zhang ◽  
De Zhong Ma ◽  
Zhen Zhou
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Electromagnetic Flowmeter ◽  
Qualitative Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Reliability Evaluation ◽  
Assessment Method ◽  
Entropy Weight ◽  
Evaluation Indexes ◽  
Mean Time

With regard to the problem that only single index has been used in assessment of reliability, a suitable comprehensive assessment method about reliability index of electromagnetic flowmeter was established, and Mean Time To First Failure(MTTFF), Mean Time Between Failure(MTBF) and equivalent failure rate(D) were selected as the standards of reliability evaluation for the electromagnetic flowmeter in this paper. Because many evaluation elements involved and failure information and evaluation indexes are fuzzy, fuzzy comprehensive evaluation based on entropy weight was introduced to quantify the qualitative evaluation indexes, and indexes weight were determined scientifically by using comprehensive evaluation obtained from combining a subjective expert’s evaluation weight with objective entropy weight. Two kinds of the domestically produced electromagnetic flowmeter were studied, the censored data obtained from the process of consumers’s use were analyzed, and fuzzy comprehensive evaluation method based on entropy weight was used to evaluate the indexes of reliability in two kinds of electromagnetic flowmeter comprehensively. The results show that the conclusion is consistent with the fact, the method can effectively solve the problem existed in current modeling, and evaluation of electromagnetic flowmeter reliability has great practical value in the application.

scholarly journals Human Reliability Evaluation Based on Objective and Subjective Comprehensive Method Used for Ergonomic Interface Design

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xin Liu ◽  
Zheng Liu ◽  
Peng-qing Chen ◽  
Zi-yu Xie ◽  
Bin-jun Lai ◽  
...  
Keyword(s):  
Human Computer Interaction ◽  
Machine Tool ◽  
Interface Design ◽  
Evaluation Method ◽  
Reliability Evaluation ◽  
Assessment Method ◽  
Human Reliability ◽  
Comprehensive Method ◽  
Interaction Interface ◽  
Computer Interaction

In the process of machining, the operator’s incorrect operation using the control human-computer interaction interface may lead to a disastrous effect on the whole production chain such as task failure and system failure. The eight types of using errors about human-computer interaction interface system (misperception, memory lapse, carelessness, improper decision-making, improper operation, improper interface layout design, improper icon and text display design, and improper prompt feedback) are proposed based on the cognition from users. According to the eight types of using error, the human reliability and safety evaluation method is proposed. Considering the variability objective and uncertainty subjective factors in the human-machine interaction process, the human reliability evaluation method is proposed based on objective and subjective comprehensive weighting under ergonomic principles. Firstly, based on the investigation of relevant machine tool interface design, the comprehensive evaluation index system for man-machine reliability of complex interface design is established. Secondly, an objective and subjective comprehensive weight assignment method as the composition of Theilʼs entropy weight method combined with TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) and improved AHP (analytic hierarchy process) method combined with fuzzy mathematics is proposed. It can not only effectively avoid the impact of excessive subjective factors on empowerment but also fully excavate the real information in the survey data and improve the objectivity and accuracy of the weight data of evaluation indicators at all levels. Thirdly, taking the interface design of CNC machine tool equipment for example, the best human-computer interaction interface design schemes are chosen according to the human reliability evaluation method based on objective and subjective comprehensive method calculated by Entropy-TOPSIS-AHP. Finally, based on eye movement experiments, the use efficiency and accuracy of the human-computer interaction interface design scheme chosen by the assessment method are better than the other design schemes or original one to verify the assessment method validity.

A complex system reliability evaluation method

1986 ◽  
Vol 16 (2) ◽  
pp. 163-177 ◽  
Author(s):  
Balbir S. Dhillon ◽  
Subramanyam N. Rayapati
Keyword(s):  
Complex System ◽  
System Reliability ◽  
Evaluation Method ◽  
Reliability Evaluation

The Research on Reliability of Drilling Automatic Sampling Mechanism

2013 ◽  
Vol 385-386 ◽  
pp. 188-191
Author(s):  
Li Li Wang ◽  
Yu Pang
Keyword(s):  
Probability Theory ◽  
Lunar Surface ◽  
System Reliability ◽  
Evaluation Method ◽  
Reliability Evaluation ◽  
Working Environment ◽  
Dynamic Distribution ◽  
Automatic Sampling ◽  
Optimization Allocation ◽  
Distribution Of Stress

This article put forward drilling mechanism reliability evaluation method on the lunar surface based on probability theory of stress-strength according to the characteristic, working environment and force condition of drilling automatic sampling mechanism on the lunar surface, ABAQUS was utilized to model and simulate the drilling automatic sampling mechanisms, and the dynamic distribution of stress of drilling automatic sampling mechanisms was obtained. According to analytic system reliability and the reliability evaluation reasonably, the optimization allocation to the use of material and system reliability can be realized.

The Reliability Evaluation Method for Success or Failure Product

2013 ◽  
Vol 710 ◽  
pp. 298-301
Author(s):  
Hai Bo Liu ◽  
Jin Huang Wu ◽  
Yi Dong Wang ◽  
Jun Wei Lei
Keyword(s):  
Evaluation Method ◽  
Reliability Assessment ◽  
Estimation Method ◽  
Reliability Evaluation ◽  
Assessment Method ◽  
Assessment Methods ◽  
Reliability Test ◽  
Confidence Estimation ◽  
Test Assessment

It is illustrated that establishing the reliability assessment method for Success or Failure product is important, and make an analysis and comparison on reliability test assessment methods for the existing four Success or Failure products. Furthermore, a new kind of reliability assessment method and confidence estimation method is proposed in this paper, which is indicated as a rational and applicable method.

scholarly journals System Reliability Evaluation of a Bridge Structure Based on Multivariate Copulas and the AHP–EW Method That Considers Multiple Failure Criteria

2020 ◽  
Vol 10 (4) ◽  
pp. 1399 ◽  
Author(s):  
Hanbing Liu ◽  
Xirui Wang ◽  
Guojin Tan ◽  
Xin He
Keyword(s):  
System Reliability ◽  
Failure Modes ◽  
Failure Criteria ◽  
Reliability Evaluation ◽  
Bridge Structure ◽  
Copula Functions ◽  
Entropy Weight ◽  
Joint Failure ◽  
Simply Supported ◽  
Bridge System

The system reliability evaluation of a bridge structure is a complicated problem. Previous studies have commonly used approximate estimation methods, such as the wide bounds method and the narrow bounds method, but neither could obtain an accurate result. In recent years, the copula theory has been introduced into the system reliability evaluation, which can obtain more accurate results than the approximate methods. However, most studies simply construct binary copula functions to consider the joint failure of two failure modes. For a complex bridge structure composed of multiple components and failure modes, the joint failure of multiple failure modes needs to be considered. Before evaluating the system reliability, it is necessary to determine the failure criteria of the system. Different failure criteria for simply supported beam bridges have been proposed. However, there is no standard available to determine which failure criterion to choose, and the selection of failure criteria is ambiguous. In this paper, a novel method is proposed to evaluate the system reliability of a simply supported beam bridge by considering multiple failure criteria based on multivariate copulas and the analytic hierarchy process entropy weight (AHP–EW) method. The method first considers multiple failure criteria comprehensively and constructs multivariate copulas for the joint failure of multiple components in a bridge system reliability evaluation. The AHP–EW method is a comprehensive weighting method combining the analytic hierarchy process and entropy weight methods, which is used to establish the hierarchical analysis model between system reliability and multiple failure criteria. By considering the joint failure of multiple failure modes in the system reliability evaluation under a single failure criterion, multivariate copula functions were constructed. In order to verify the applicability of the proposed bridge system reliability method, a simply supported reinforced concrete (RC) hollow slab bridge composed of nine slab segments was selected as the numerical example. The results indicate that the method proposed in this paper could evaluate the bridge system reliability more comprehensively and reasonably.

scholarly journals System Reliability Evaluation of Prefabricated RC Hollow Slab Bridges Considering Hinge Joint Damage Based on Modified AHP

2019 ◽  
Vol 9 (22) ◽  
pp. 4841 ◽  
Author(s):  
Hanbing Liu ◽  
Xirui Wang ◽  
Guojin Tan ◽  
Xin He ◽  
Guobao Luo
Keyword(s):  
System Reliability ◽  
Evaluation Method ◽  
Joint Damage ◽  
Highway Bridges ◽  
Reliability Evaluation ◽  
Actual System ◽  
Parallel Methods ◽  
Hinge Joint ◽  
Judgment Matrix ◽  
Bridge System

The prefabricated reinforced concrete (RC) hollow slab bridges, with the advantages of high quality, lower cost and shorter construction period, have been widely used for small-to-medium-span highway bridges in China. Because of environmental deterioration and traffic volume increases, the performance of the bridge system deteriorates gradually. Accurate bridge system evaluation can provide a reliable basis for maintenance and management. A bridge system is composed of multiple interrelated components, which makes the system reliability evaluation become a computationally intractable work. In this paper, an effective method was proposed to evaluate the system reliability of the prefabricated RC hollow slab bridge considering hinge joint damage based on the modified analytic hierarchy process (AHP). Considering the subjectivity of the traditional AHP method in constructing the judgment matrix, this paper proposed an objective construction method of the judgment matrix to modify the traditional AHP. The modified hinge plate method (MHPM) proposed by the previous research was utilized to analyze the effect of hinge joint damage on system reliability. In order to verify the applicability of the proposed system reliability evaluation method, a simply supported RC hollow slab bridge was selected as the case study and the system reliability indexes were compared with the traditional series and parallel methods. The results indicated that the traditional methods were either too conservative or too radical to objectively evaluate the actual system reliability level of the structure. In contrast, the proposed method in this paper was more suitable for evaluating the system reliability of such bridges, and more accurate in providing maintenance decision makers with a relatively reasonable bridge condition information.

The Research of Computer Complex Network Reliability Evaluation Method Based on GABP Algorithm

2014 ◽  
Vol 556-562 ◽  
pp. 6207-6210 ◽  
Author(s):  
Hai Yan Chen
Keyword(s):  
Network Security ◽  
Complex Network ◽  
Evaluation System ◽  
Evaluation Method ◽  
Computer Network ◽  
Network Reliability ◽  
Reliability Evaluation ◽  
Assessment Method ◽  
Security Evaluation ◽  
Computer Complex

With the wide application of computer network, network security issues become increasingly prominent. Currently, the most commonly used network security evaluation method is risk assessment method, as well as to test and evaluation system of safety degree by software vulnerability scanning tools and so on. However, network security is related to computer, communication, physics, mathematics, biology, management, social, and many other fields, which is complicated system engineering. As a result, poor operational safety exist in the existing method, thus in this paper, the research of computer complex network reliability evaluation method based on GABP algorithm is put forward.

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