The Numerical Control Device Reliability Based on Bayesian Approach

2014 ◽  
Vol 556-562 ◽  
pp. 2515-2518
Author(s):  
Bin Quan Li
Keyword(s):  
Material Selection ◽  
High Reliability ◽  
Reliability Evaluation ◽  
Control Device ◽  
Numerical Control ◽  
Mcmc Method ◽  
Failure Data ◽  
Device Reliability ◽  
Important Means ◽  
Complex Forms

The material selection and manufacturing processes of numerical control device were related with the reliability of system. Therefore, the reliability evaluation of it was significant. Numerical control system was, obviously, high-reliability product and the application of Bayesian theory has become an important means of its reliability assessment. The failure data of numerical control device obeys Weibull distribution which has complex forms. The posterior distribution becomes extremely complicated and the numerical integration which Bayesian computing depends on is not available. Markov chain Monte Carlo (MCMC) method ensures the implementation of the assessment. The result of Bayesian estimation proves that it increases the robustness, accuracy and effectiveness of the calculation and it's suitable for numerical control device reliability evaluation.

Estimation of Overall Reliability for Zero-Failure Batch Production Monitoring Instrument Based on E-Bayes Method

2014 ◽  
Vol 578-579 ◽  
pp. 1177-1182
Author(s):  
Wei Hua Fang ◽  
Na Zhang
Keyword(s):  
Evaluation Method ◽  
High Reliability ◽  
Interval Estimation ◽  
Reliability Evaluation ◽  
Point Estimation ◽  
Batch Production ◽  
Monitoring Instrument ◽  
Failure Data ◽  
Bayes Theory ◽  
Overall Reliability

To solve the problem of the overall reliability evaluation for the specific batch high-reliability monitoring instrument, for the practical problems for zero-failure data of the high-reliability instrument, we propose the batch production instrument overall reliability evaluation method based on E-Bayes theory, and give the point estimation and interval estimation of instrument overall reliability. Case study demonstrates the rationality and feasibility of the proposed method, which provides a reference for the dam safety monitoring management.

The Application of S7-200 PLC Reactive Compensation Device in Small Substation

2012 ◽  
Vol 479-481 ◽  
pp. 1476-1480
Author(s):  
Qing He Chu ◽  
Wen Si Cao ◽  
Zhen Nie
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
High Reliability ◽  
Reactive Power Compensation ◽  
Control Device ◽  
Reactive Compensation ◽  
Reconstruction Project ◽  
Compensation Device ◽  
And Control

In the present rural power grid reconstruction project ,according to the problems of capacitor reactive power compensation in rural small substation. Take a small substation for instance, according to its operation and control method, set the criterion of the capacitor bank switching. A new high reliability, flexible reactive power compensation control device based on s7-200 PLC is designed. It plays an important role in improving the power supply , guaranteeing the quality of voltage, reducing the loss of rural power gid.

Synthesis of the process of training of technological commands and auxiliary operations of cyclic electro-automatics when programming multipurpose equipment in the complex of operating systems CNC and PLC

2021 ◽  
pp. 40-44
Author(s):  
YU.N. Kurnasov E.V. Bugrov ◽  
E.V. Kurnasov
Keyword(s):  
Operating Systems ◽  
Control Program ◽  
Control Device ◽  
Numerical Control ◽  
Technological Equipment ◽  
Cnc Machine ◽  
Graphical Programming ◽  
Control Programs ◽  
G Code ◽  
The Subject

A method for preparing technological conditions for programming and elements for implementing control programs of multipurpose technological equipment in the complex of operating systems of the CNC and PLC are proposed. The subject solution effectively combines the elements of parametric and graphical programming in the development of both CNC and PLC subprograms. Keywords: control program, algorithmic programming, G-code, numerical control device, programmable logic controller, electroautomatics, technological equipment, CNC machine. [email protected]

Integrated reliability and maintainability analysis of Computerized Numerical Control Turning Center considering the effects of human and organizational factors

2019 ◽  
Vol 26 (1) ◽  
pp. 87-103
Author(s):  
Rajkumar Bhimgonda Patil
Keyword(s):  
Organizational Factors ◽  
Numerical Control ◽  
Content Type ◽  
Failure Data ◽  
Turning Center ◽  
Maintainability Analysis ◽  
Human And Organizational Factors ◽  
Mean Time ◽  
Best Fit ◽  
Field Failure

Purpose Reliability, maintainability and availability of modern complex engineered systems are significantly affected by four basic systems or elements: hardware, software, organizational and human. Computerized Numerical Control Turning Center (CNCTC) is one of the complex machine tools used in manufacturing industries. Several research studies have shown that the reliability and maintainability is greatly influenced by human and organizational factors (HOFs). The purpose of this paper is to identify critical HOFs and their effects on the reliability and maintainability of the CNCTC. Design/methodology/approach In this paper, 12 human performance influencing factors (PIFs) and 10 organizational factors (OFs) which affect the reliability and maintainability of the CNCTC are identified and prioritized according to their criticality. The opinions of experts in the fields are used for prioritizing, whereas the field failure and repair data are used for reliability and maintainability modeling. Findings Experience, training, and behavior are the three most critical human PIFs, and safety culture, problem solving resources, corrective action program and training program are the four most critical OFs which significantly affect the reliability and maintainability of the CNCTC. The reliability and maintainability analysis reveals that the Weibull is the best-fit distribution for time-between-failure data, whereas log-normal is the best-fit distribution for Time-To-Repair data. The failure rate of the CNCTC is nearly constant. Nearly 66 percent of the total failures and repairs are typically due to the hardware system. The percentage of failures and repairs influenced by HOFs is nearly only 16 percent; however, the failure and repair impact of HOFs is significant. The HOFs can increase the mean-time-to-repair and mean-time-between-failure of the CNCTC by nearly 65 and 33 percent, respectively. Originality/value The paper uses the field failure data and expert opinions for the analysis. The critical sub-systems of the CNCTC are identified using the judgment of the experts, and the trend of the results is verified with published results.

Reliability Evaluation of CSP Using New Flip-Chip Bonding Technology: Both-Sided CSP and Single-Sided CSP

2002 ◽  
Author(s):  
Hideo Koguchi ◽  
Nipon Taweejun ◽  
Kazuto Nishida ◽  
Chie Sasaki
Keyword(s):  
Finite Element Method ◽  
Cross Section ◽  
Flip Chip ◽  
High Reliability ◽  
Reliability Evaluation ◽  
Thickness Direction ◽  
Material Parameters ◽  
Conductive Film ◽  
Chip Size ◽  
Bonding Technology

Chip-size packaging (CSP) attracts largely attentions due to its lighter, thinner and smaller size. In this study, the deformations and the stresses in the CSP fabricated by non-conductive film stud-bump direct interconnection (NSD) were analyzed. The reliability evaluation of single-sided CSP and both-sided CSP were investigated for heat cycles. The material parameters, i.e. stresses, strains and deformations, for achieving a high reliability of CSP were investigated using a finite element method and experiment. The dependency of the life in single-sided CSP and both-sided CSP on the thicknesses of IC and substrate could be expressed using a normal stress in the thickness direction and shear stress in the vertical cross section, respectively.

Energy Dissipation Behavior of an Autonomous Controller for Semi-Active Control Device

2009 ◽  
Author(s):  
Ming-Hsiang Shih ◽  
Wen-Pei Sung
Keyword(s):  
Control System ◽  
Energy Dissipation ◽  
Active Control ◽  
High Reliability ◽  
Structural Response ◽  
Control Device ◽  
Manufacturing Cost ◽  
Moving Direction ◽  
Control Order ◽  
The Right

In this research, autonomous controller is developed to provide the function of “Sensing-Computing-Transferring” for improving of energy dissipation capability of semi-active control device. This proposed controller has qualifications of detecting structural response under the excitation of earthquake; it depends on the control law to produce control order to adjust and control the action of semi-active control damper. The principle of this controller is: 1.) autonomous controller and damper-added stiffness element are parallel connection; 2.) the direction of pressure force and velocity moving direction of structure are changed simultaneously by this controller; 3.) the action of switching direction of damper has been finished when the tiny displacement of structure is happened by reverse process of moving direction of structure. Practically, this controller was simulated by connecting soft springs, damper and actuator in serial. The experimental results indicate that the function and energy-dissipating behavior of this proposed controller is similar to traditional semi-active controller except that this controller can switch the damper status at the right moment. This proposed controller can replace the detector, central control computer and damping controller included in original semi-active control system. The advantages of this developed autonomous controller are: 1.) low manufacturing cost; 2.) low requirement of system maintenance; 3) high reliability of control system.

Synthetic Reliability Assessment Model involving Temperature–Humidity Step-Stress Based on Wiener Process

2020 ◽  
pp. 2150016
Author(s):  
Bin Suo ◽  
Liang Zhao
Keyword(s):  
Wiener Process ◽  
High Reliability ◽  
Likelihood Estimation ◽  
Degradation Process ◽  
Test Sample ◽  
Assessment Model ◽  
Engineering Practice ◽  
Accelerated Degradation ◽  
Failure Data ◽  
Newton Iteration Method

There are always some difficulties in storage reliability evaluation of high-reliability, long-life, and high-value products, such as the test sample being small, degradation speed being slow, and failure data being inadequate. Temperature–humidity step-stress accelerated degradation test (THSS-ADT) is an effective method to evaluate the reliability of this type of products, but the test data processing is an extremely complex work. The motivation of this paper is to provide a clear, effective, and convenient method to evaluate the reliability on the basis of THSS-ADT data. Considering the stochastic volatility in degradation process, Wiener process is used to modeling the accelerated degradation process. The methods to estimate the parameters of Peck accelerated model and degradation model are discussed under temperature–humidity step-stress. As ordinary optimization algorithms (such as Newton Iteration Method and impelling function method) find it difficult to get the solutions, particle swarm optimization (PSO) method is used to solve the problem of maximum-likelihood estimation. Finally, the proposed methods are demonstrated for two examples, in which one is a numerical simulation, and another is an engineering practice of a microwave power amplifier.

Reliability evaluation of the servo turret with accurate failure data and interval censored data based on EM algorithm

2020 ◽  
Vol 34 (4) ◽  
pp. 1503-1513 ◽  
Author(s):  
Bo Sun ◽  
Narayanaswamy Balakrishnan ◽  
Fei Chen ◽  
Binbin Xu ◽  
Zhaojun Yang ◽  
...  
Keyword(s):  
Em Algorithm ◽  
Censored Data ◽  
Reliability Evaluation ◽  
Interval Censored Data ◽  
Failure Data ◽  
Interval Censored

Study on Rebuilding of X53 Milling Machine for Numerical Control

2011 ◽  
Vol 211-212 ◽  
pp. 842-845
Author(s):  
Shuang Chen ◽  
Wu Jun Lai ◽  
Feng Liu
Keyword(s):  
Mechanical System ◽  
High Reliability ◽  
Dynamic Stiffness ◽  
Numerical Control ◽  
Mechanical Transmission ◽  
Milling Machine ◽  
Cnc System ◽  
Strong Function ◽  
Transmission Part ◽  
Modern Manufacturing

CNC technology and equipment is an important foundation for modern manufacturing industry.In this paper, mechanical system and hardware was rebuilded on the X53 Milling Machine for Numerical Control based on the transformation of economy, convenience, practicalityand reliability. After the transformation , mechanical transmission part has high static and dynamic stiffness, CNC system has integration and high reliability, strong function.

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