Reliability analysis and life cycle cost optimization: a case study from Indian industry

Waghmode, Laxman Yadu; Patil, Rajkumar Bhimgonda

doi:10.1108/ijqrm-11-2014-0184

Cited by 43 publications

(22 citation statements)

References 17 publications

(15 reference statements)

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“…Yang et al [50], using field data of machining centers, showed the shape parameter to be 1.17 for the electrical system, 1.77 for the CNC system, and 2 for the servo system (implying that their hazard rates were increasing throughout the life). The studies by Waghmode and Patil [51], Patil et al [52], Keller et al [53], and Dai et al [54] on computerized numerical control machine tools show that the hazard rates of their electronic components are not constant. Figure 4 shows the hazard rate curve of the electronic system of a CNC machine tool.…”

Section: B Useful Life Periodmentioning

confidence: 99%

An Assessment of Validity of the Bathtub Model Hazard Rate Trends in Electronics

et al. 2021

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The bathtub model has often been cited as a hazard rate profile that predicts not only human mortality but also the hazard rate of manufactured products. This paper examines the inapplicability of the bathtub model to predict the hazard rate of electronic components, products, and systems. The paper reviews various literature and uses numerous experiments and field failure data to support its argument. The factors affecting the hazard rate of electronics are then discussed, common hazard rate trends for electronics are identified, and recommendations for the assessment of hazard rates are given. This paper recommends that a preconceived model of hazard rate over time should not be used.

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Section: B Useful Life Periodmentioning

confidence: 99%

An Assessment of Validity of the Bathtub Model Hazard Rate Trends in Electronics

et al. 2021

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“…Reliability and maintainability analysis facilitates in improving competitiveness and customer satisfaction (Madu, 2005). Waghmode and Patil (2016) performed reliability analysis to optimize the life cycle cost. Kumar et al (2017) performed the availability and cost analysis of an engineering system.…”

Section: Literature Reviewmentioning

confidence: 99%

Reliability, availability and maintainability analysis of a cement plant: a case study

Choudhary¹,

Tripathi²,

Shankar

2019

IJQRM

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Purpose The demand of cement in India is expected to increase rapidly as the government has been giving immense boost to various housing facilities, infrastructure projects, road networks and railway corridors. One of the ways to meet this rise in the demand of cement is to increase the capacity utilization of the existing cement plants by improving their availability. The availability of a cement plant can be improved by avoiding failures and reducing maintenance time through reliability, availability and maintainability (RAM) analysis of its subsystems. The paper aims to discuss this issue. Design/methodology/approach The data related to time between failure (TBF) and time to repair (TTR) of all the critical subsystems of a cement plant were collected over a period of two years for carrying out RAM analysis. Trend test and serial correlation test were performed on TBF and TTR data to verify whether these data are independent and identically distributed or not. Afterwards, the authors use EasyFit 5.6 professional software to find best-fit distribution of TBF and TTR data and their parameters. The effectiveness of a preventive maintenance policy was evaluated by simulating the real and proposed systems. Findings The results of the analysis show that the raw mill and the coal mill are critical subsystems of a cement plant from a reliability point of view, whereas the kiln is a critical subsystem from an availability point of view. The analysis shows that the repair time of the cement mill should be reduced for improving the availability of the cement plant. The RAM analysis showed that the capacity of the case study company is 17 percent underutilized due to maintenance-related problems and 15 percent underutilized because of management-related problems. Practical implications The study exhibits the usage of RAM analysis in deciding preventive maintenance programs of several cement plant subsystems. Thus, it would serve as a reference for reliability and maintenance managers in deciding maintenance strategies of cement plants as well as in improving their capacity utilization. Originality/value The study exhibits the usage of RAM analysis in deciding preventive maintenance programs of several cement plant subsystems. Even more, using a simulation study, the authors show that preventive maintenance of the cement plant beyond a certain level can be disadvantageous as it leads to an increase in downtime and decrease in availability.

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“…Reliability is the characteristic of a system expressed by the probability that a system/component can perform a required function for which it was designed, in given conditions for a given period of time (Waghmode & Patil, 2016). Mathematical definition of reliability is presented by…”

Section: Reliabilitymentioning

confidence: 99%

A reliability-based preventive maintenance methodology for the projection spot welding machine

Ulugbek¹,

Sheng²,

Xiao³

et al. 2018

10.5267/j.msl

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An effective operations of a projection spot welding (PSW) machine is closely related to the effectiveness of the maintenance. Timely maintenance can prevent failures and improve reliability and maintainability of the machine. Therefore, establishing the maintenance frequency for the welding machine is one of the most important tasks for plant engineers. In this regard, reliability analysis of the welding machine can be used to establish preventive maintenance intervals (PMI) and to identify the critical parts of the system. In this reliability and maintainability study, analysis of the PSW machine was carried out. The failure and repair data for analysis were obtained from automobile manufacturing company located in Uzbekistan. The machine was divided into three main sub-systems: electrical, pneumatic and hydraulic. Different distributions functions for all subsystems was tested and their parameters tabulated. Based on estimated parameters of the analyzed distributions, PMI for the PSW machines sub-systems at different reliability levels was calculated. Finally, preventive measures for enhancing the reliability of the PSW machine sub-systems are suggested.

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Reliability analysis and life cycle cost optimization: a case study from Indian industry

Cited by 43 publications

References 17 publications

An Assessment of Validity of the Bathtub Model Hazard Rate Trends in Electronics

An Assessment of Validity of the Bathtub Model Hazard Rate Trends in Electronics

Reliability, availability and maintainability analysis of a cement plant: a case study

A reliability-based preventive maintenance methodology for the projection spot welding machine

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