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LSTM based artificial intelligence predictive maintenance technique for availability rate and OEE improvement in a TPM implementing plant through Industry 4.0 transformation 基于LSTM的人工智能预测维护技术,通过工业4.0转型提高TPM实施工厂的可用率和OEE
IF 1.5 Q2 Engineering Pub Date : 2023-03-14 DOI: 10.1108/jqme-07-2022-0041
Roosefert Mohan, J. Roselyn, R. Uthra
PurposeThe artificial intelligence (AI) based total productive maintenance (TPM) condition based maintenance (CBM) approach through Industry 4.0 transformation can well predict the breakdown in advance to eliminate breakdown.Design/methodology/approachMeeting the customer requirement as per the delivery schedule with the existing resources are always a big challenge in industries. Any catastrophic breakdown in the equipment leads to increase in production loss, damage to machines, repair cost, time and affects delivery. If these breakdowns are predicted in advance, the breakdown can be addressed before its occurrence and the demand supply chain can be met. TPM is one of the essential operational excellence tool used in industries to utilize the existing resources of a plant in a optimal way. The conventional time based maintenance (TBM) and CBM approach of TPM in Industry 3.0 is time consuming and not accurate enough to achieve zero down time.FindingsThe proposed AI and IIoT based TPM is achieved in a digitalized data oriented platform to monitor and control the health status of the machine which may reduce the catastrophic breakdown by 95% and also improves the quality rate and machine performance rate. Based on the identified key signature parameters related to major breakdown are measured using the sensors, digitalised by programmable logic controller (PLC) and monitored by supervisory control and data acquisition (SCADA) and predicted in server or cloud.Originality/valueLong short term memory based deep learning network was developed as a regression forecasting model to predict the remaining useful life RUL of the part or assembly and based on the predictions, corrective action has been implemented before the occurrence of breakdown. The reliability and consistency of the proposed approach are validated and horizontally deployed in similar machines to achieve zero downtime.
目的通过工业4.0转型,基于人工智能(AI)的全面生产维护(TPM)状态维护(CBM)方法可以很好地提前预测故障,从而消除故障。设计/方法/方法在现有资源的情况下,按照交付时间表满足客户需求一直是一个巨大的挑战。设备的任何灾难性故障都会导致生产损失、机器损坏、维修成本、时间和交货影响的增加。如果提前预测到这些故障,则可以在故障发生之前解决故障,并满足需求供应链。TPM是一种重要的卓越运营工具,用于以最优方式利用工厂的现有资源。工业3.0中传统的基于时间的TPM维护(TBM)和CBM方法耗时且不够精确,无法实现零停机时间。基于人工智能和工业物联网的TPM在面向数字化数据的平台上实现了对机器健康状态的监测和控制,可减少95%的灾难性故障,提高了机器的质量和性能。基于识别出的与主要故障相关的关键特征参数,使用传感器进行测量,通过可编程逻辑控制器(PLC)进行数字化处理,通过监控和数据采集(SCADA)进行监控,并在服务器或云中进行预测。基于独创性/价值短期记忆的深度学习网络作为回归预测模型,用于预测零件或组件的剩余使用寿命RUL,并根据预测结果在故障发生前实施纠正措施。所提出的方法的可靠性和一致性得到验证,并在类似的机器上水平部署,以实现零停机时间。
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引用次数: 0
Relationship between TPM practices and operational performance in soft drinks manufacturing industry 软饮料制造业TPM实践与经营绩效的关系
IF 1.5 Q2 Engineering Pub Date : 2023-03-06 DOI: 10.1108/jqme-10-2022-0067
A. Singh, Nardos Fentaw Awoke
PurposeThe purpose of this paper is to investigate the relationship between total productive maintenance (TPM) practices and operational performance (OP) in soft drinks manufacturing industry, Ethiopia.Design/methodology/approachIn this study acceptability and implementation of five TPM practices (i.e., dependent factors: autonomous maintenance (AUT); safety, health and environment (SHE); education and training (EDT); focused improvement; and planned maintenance (PLM)) in soft drinks manufacturing industry have been elaborated to ascertain the benefits accrued as a result of successful TPM practices (i.e., independent variables) on OP (i.e., dependent variables). A self-administered survey seven-point Likert scale questionnaire was used for primary data collection. By using simple random sampling technique a total of 100 useable responses resulted in a 66.66 per cent response rate. Descriptive (mean, standard deviation) and inferential statistics (factor analysis, correlation, simple and multiple regression analysis) analysis were performed using Statistical Package for Social Sciences (SPSS) software (version-28) to identify the relationship and effect of TPM practices on OP. Five hypotheses were developed and tested.FindingsResults show that four of the TPM practices were positively and significantly correlated with OP. Aggregate TPM shows positive and significant correlation with OP. Four hypotheses results revealed that the AUT; SHE; EDT and PLM practices have positive and significant relationship with OP and significantly improve OP. The results also show that the TPM practices have positive and significant relationship with OP and significantly improve cost effectiveness, product quality, on-time delivery and volume flexibility.Practical implicationsThe benefits gained by TPM practices in selected soft drinks manufacturing industry have been highlighted, that could be genuine source of motivation to other companies to go in for TPM program. This research contributes to the literature by examining the contingency of various TPM enabling factors in the context of the Ethiopian soft drinks manufacturing sector, and it, therefore, provides direction to increase the success rate of TPM implementation. Study offers academics and practitioners a better understanding of the relationship and effect of the TPM practices on the OPs. Thus, practitioners will be able to make better and more effective decisions about the implementation of TPM practices for better OP results.Originality/valueThe relationship between the five factors TPM practices and OP has not yet been studied or reported in the case of soft drink manufacturing industry. The questionnaire manner and items developed, factor considered in this study, sampling method, deeply statistical data analysis techniques used, soft drink manufacturing industry, developing country like Ethiopia make this study unique and revealed the gap identification in this area. The study has contributed to the TP
目的本文的目的是调查软饮料制造业的全面生产性维护(TPM)实践与运营绩效(OP)之间的关系。设计/方法/方法在本研究中,五种TPM实践的可接受性和实施情况(即依赖因素:自主维护(AUT);安全、健康和环境(SHE);教育和培训;重点改进;以及计划维护(PLM)),以确定成功的TPM实践(即自变量)对OP(即因变量)产生的效益。一份自我管理的七点Likert量表问卷用于初步数据收集。通过使用简单的随机抽样技术,总共有100个可用的回复,回复率为66.66%。使用社会科学统计包(SPSS)软件(28版)进行描述性(平均值、标准差)和推断统计学(因子分析、相关性、简单和多元回归分析)分析,以确定TPM实践对OP的关系和影响。提出并检验了五个假设。结果表明,四种TPM实践与OP呈正相关。总TPM与OP呈正显著相关。四种假设结果表明,AUT;她;EDT和PLM实践与OP呈正相关,显著提高了OP。结果还表明,TPM实践与OP呈正相关,显著改善了成本效益、产品质量、准时交付和批量灵活性。实际意义TPM实践在选定的软饮料制造行业中获得的好处已经得到强调,这可能是其他公司参与TPM计划的真正动力来源。这项研究通过考察埃塞俄比亚软饮料制造业中各种TPM促成因素的偶然性,为文献做出了贡献,因此,它为提高TPM实施的成功率提供了方向。这项研究使学者和从业者更好地了解TPM实践对OP的关系和影响。因此,从业者将能够就TPM实践的实施做出更好、更有效的决策,以获得更好的OP结果。独创性/价值五个因素TPM实践与OP之间的关系尚未在软饮料制造业的案例中进行研究或报道。问卷调查的方式和项目、本研究考虑的因素、抽样方法、使用的深入统计数据分析技术、软饮料制造业、埃塞俄比亚等发展中国家使本研究具有独特性,并揭示了该领域的差距识别。该研究有助于TPM文献,更好地了解五种TPM实践及其与软饮料制造业OP的关系,这将为制造公司的高层管理人员提供宝贵的知识,以完善他们当前的TPM实践,并随后改进OP。
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引用次数: 1
Optimal preventive maintenance policy for leased equipment for free with minimum quantity of consumables purchasing commitment by the lessee 承租人承诺以最低数量的耗材购买免费租赁设备的最佳预防性维护政策
IF 1.5 Q2 Engineering Pub Date : 2023-03-03 DOI: 10.1108/jqme-08-2022-0051
L. Tlili, C. Anis, Mokhles Bouazizi
PurposeThis paper deals with a particular type of leasing contracts according to which an equipment is leased for free with the condition for the lessee to purchase a predetermined minimum quantity of consumables during each leasing period. Maintenance actions are performed by the lessor and borne by him. Imperfect preventive maintenance is carried out every t time units throughout the leasing period. Minimal repairs are performed following equipment failures. At the end of the leasing period, an overhaul which restores the equipment to “as good as new” state is performed. The equipment is leased many times during its life cycle. The purpose of this paper is to determine the values of the decision variables for the lessor, which are the preventive maintenance (PM) period and the minimum quantity of consumables to be sold to ensure profit.Design/methodology/approachA mathematical model is developed to express the expected maintenance cost per time unit incurred by the lessor as well as his expected profit over the equipment life cycle. The optimal PM period minimizing the maintenance cost is determined first. Then, given the corresponding minimum maintenance cost, the minimum quantity of consumables (the lessor's break-even point) to be purchased by the lessee is computed. A numerical example and a sensitivity study are presented, and the obtained results are discussed.FindingsThe outcome of this work is supposed to help the lessors determining two key values to be included in each leasing contract, namely: (1) the periodicity according to which they will commit to perform preventive maintenance actions such that their average total cost of maintenance is minimized, (2) the minimum quantity of consumables that the lessee must commit to purchasing during the leasing period. This quantity must be between the break-even point and the maximum quantity associated with the capacity of the equipment.Practical implicationsPractically, the objective of this work is first to determine the optimal strategy to be adopted by the lessor in terms of effort relating to PM and second to determine the minimum quantity of consumables that the lessee must purchase during the leasing period such as profit is insured for the lessor.Originality/valueThis type of leasing (for free) has not been addressed in the literature particularly when considering maintenance strategies.
目的本文研究一种特殊类型的租赁合同,根据这种合同,设备是免费租赁的,条件是承租人在每个租赁期内购买预定的最低数量的消耗品。维修行动由出租人执行,并由出租人承担。在整个租赁期内,每t个时间单元进行一次不完善的预防性维护。设备发生故障后,应尽量减少维修。在租赁期结束时,将进行大修,使设备恢复到“如新”状态。该设备在其生命周期内被多次租赁。本文的目的是确定出租人的决策变量的值,即预防性维护(PM)期和为确保利润而出售的最低消耗品数量。设计/方法/方法开发了一个数学模型来表示出租人在设备生命周期内每时间单位的预期维护成本以及预期利润。首先确定使维护成本最小化的最佳PM周期。然后,在给定相应的最低维护成本的情况下,计算承租人要购买的消耗品的最低数量(出租人的盈亏平衡点)。给出了数值算例和灵敏度研究,并对所得结果进行了讨论。发现这项工作的结果应该有助于出租人确定每个租赁合同中包含的两个关键价值,即:(1)他们将承诺执行预防性维护行动的周期,以使他们的平均总维护成本最小化,(2)承租人在租赁期内必须承诺购买的消耗品的最低数量。该数量必须介于盈亏平衡点和与设备容量相关的最大数量之间。实际意义实际上,这项工作的目标首先是确定出租人在PM方面采取的最佳策略,其次是确定承租人在租赁期内必须购买的消耗品的最低数量,例如为出租人投保利润。独创性/价值这种类型的租赁(免费)在文献中没有提及,尤其是在考虑维护策略时。
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引用次数: 2
A study of challenges in successfully implementing maintenance practices in northern Indian small and medium manufacturing companies 印度北部中小型制造公司成功实施维护实践的挑战研究
IF 1.5 Q2 Engineering Pub Date : 2023-02-28 DOI: 10.1108/jqme-04-2022-0023
S. Sidhu, Kanwarpreet Singh, I. Ahuja
PurposeThis study aims to prioritize barriers responsible for impeding the successful implementation of maintenance practices in Northern Indian small and medium enterprises (SMEs). Maintenance practices play a crucial role in a company's long-term competitiveness in the manufacturing sector, significantly affecting production, quality and cost. Maintenance practices are equally vital in SMEs, because SMEs are the heart of the large industries, as these units are dependent on SMEs for their parts and sub-assemblies. However, due to many obstacles, SMEs have been confronted with various challenges in implementing maintenance practices.Design/methodology/approachFirst, a review of the published articles and survey of 216 Indian organizations has been conducted to identify the maintenance implementation barriers in SMEs. The Pareto analysis and the VlseKriterijumska Optimizcija Kompromisno Resenje in Serbian (VIKOR) approach have been deployed to rank the significant challenges in implementing maintenance practices in Northern Indian SMEs.FindingsThe present study aims to recognize and rank the barriers to effective maintenance implementation practices in SMEs, in order to initiate appropriate corrective actions to improve maintenance function performance.Originality/valueThe study will help maintenance managers in preparing an action plan to overcome the obstacles to maintenance practice's performance for realizing significant manufacturing performance improvements.
目的本研究旨在优先考虑阻碍印度北部中小企业成功实施维护实践的障碍。维护实践对公司在制造业的长期竞争力起着至关重要的作用,对生产、质量和成本都有重大影响。维护实践在中小企业中同样重要,因为中小企业是大型行业的核心,因为这些单位的零件和子组件依赖于中小企业。然而,由于许多障碍,中小企业在实施维护实践方面面临着各种挑战。设计/方法/方法首先,对已发表的文章进行了审查,并对216个印度组织进行了调查,以确定中小企业的维护实施障碍。Pareto分析和塞尔维亚语中的VlseKriterijumska Optimizcija Komporisno Resenje(VIKOR)方法已被用于对印度北部中小企业实施维护实践的重大挑战进行排名,以便启动适当的纠正措施以提高维护功能性能。独创性/价值该研究将帮助维护经理制定行动计划,以克服维护实践绩效的障碍,从而实现显著的制造绩效改进。
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引用次数: 0
Text mining techniques for identifying failure modes 识别故障模式的文本挖掘技术
IF 1.5 Q2 Engineering Pub Date : 2023-02-06 DOI: 10.1108/jqme-02-2020-0012
Francina Malan, J. L. Jooste
PurposeThe purpose of this paper is to compare the effectiveness of the various text mining techniques that can be used to classify maintenance work-order records into their respective failure modes, focussing on the choice of algorithm and preprocessing transforms. Three algorithms are evaluated, namely Bernoulli Naïve Bayes, multinomial Naïve Bayes and support vector machines.Design/methodology/approachThe paper has both a theoretical and experimental component. In the literature review, the various algorithms and preprocessing techniques used in text classification is considered from three perspectives: the domain-specific maintenance literature, the broader short-form literature and the general text classification literature. The experimental component consists of a 5 × 2 nested cross-validation with an inner optimisation loop performed using a randomised search procedure.FindingsFrom the literature review, the aspects most affected by short document length are identified as the feature representation scheme, higher-order n-grams, document length normalisation, stemming, stop-word removal and algorithm selection. However, from the experimental analysis, the selection of preprocessing transforms seemed more dependent on the particular algorithm than on short document length. Multinomial Naïve Bayes performs marginally better than the other algorithms, but overall, the performances of the optimised models are comparable.Originality/valueThis work highlights the importance of model optimisation, including the selection of preprocessing transforms. Not only did the optimisation improve the performance of all the algorithms substantially, but it also affects model comparisons, with multinomial Naïve Bayes going from the worst to the best performing algorithm.
目的本文的目的是比较各种文本挖掘技术的有效性,这些技术可用于将维修工单记录分类为各自的故障模式,重点是算法的选择和预处理转换。评估了三种算法,即伯努利-朴素贝叶斯、多项式-朴素贝叶斯和支持向量机。设计/方法论/方法这篇论文既有理论部分,也有实验部分。在文献综述中,从三个角度考虑了文本分类中使用的各种算法和预处理技术:特定领域的维护文献、更广泛的短格式文献和一般的文本分类文献。实验组件由5×2嵌套交叉验证组成,内部优化循环使用随机搜索程序执行。发现从文献综述来看,受短文档长度影响最大的方面是特征表示方案、高阶n-gram、文档长度归一化、词干、停止词去除和算法选择。然而,从实验分析来看,预处理转换的选择似乎更多地取决于特定的算法,而不是短文档长度。多项式Naïve Bayes的性能略好于其他算法,但总体而言,优化模型的性能相当。原创性/价值这项工作强调了模型优化的重要性,包括预处理变换的选择。优化不仅大大提高了所有算法的性能,而且还影响了模型比较,多项式朴素贝叶斯算法从最差的算法变成了性能最好的算法。
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引用次数: 0
Maintenance strategies and energy efficiency: a review 维护策略和能源效率:综述
IF 1.5 Q2 Engineering Pub Date : 2023-02-06 DOI: 10.1108/jqme-06-2021-0046
N. Firdaus, H. Ab-Samat, B. T. Prasetyo
PurposeThis paper reviews the literature on maintenance strategies for energy efficiency as a potential maintenance approach. The purpose of this paper is to identify the main concept and common principle for each maintenance strategy for energy efficiency.Design/methodology/approachA literature review has been carried out on maintenance and energy efficiency. The paper systematically classified the literature into three maintenance strategies (e.g. inspection-based maintenance [IBM], time-based maintenance [TBM] and condition-based maintenance [CBM]). The concept and principle of each maintenance strategy are identified, compared and discussed.FindingsEach maintenance strategy's main concept and principle are identified based on the following criteria: data required and collection, data analysis/modeling and decision-making. IBM relies on human senses and common senses to detect energy faults. Any detected energy losses are quantified to energy cost. A payback period analysis is commonly used to justify corrective actions. On the other hand, CBM monitors relevant parameters that indicate energy performance indicators (EnPIs). Data analysis or deterioration modeling is needed to identify energy degradation. For the diagnostics approach, the energy degradation is compared with the threshold to justify corrective maintenance. The prognostics approach estimates when energy degradation reaches its threshold; therefore, proper maintenance tasks can be planned. On the other hand, TBM uses historical data from energy monitoring. Data analysis or deterioration modeling is required to identify degradation. Further analysis is performed to find the optimal time to perform a maintenance task. The comparison between housekeeping, IBM and CBM is also discussed and presented.Practical implicationsThe literature on the classification of maintenance strategies for energy efficiency has been limited. On the other hand, the ISO 50001 energy management systems standard shows the importance of maintenance for energy efficiency (MFEE). Therefore, to bridge the gap between research and industry, the proposed concept and principle of maintenance strategies will be helpful for practitioners to apply maintenance strategies as energy conservation measures in implementing ISO 50001 standard.Originality/valueThe novelty of this paper is in-depth discussion on the concept and principle of each maintenance strategy (e.g. housekeeping or IBM, TBM and CBM) for energy efficiency. The relevant literature for each maintenance strategy was also summarized. In addition, basic rules for maintenance strategy selection are also proposed.
目的本文综述了能源效率维护策略作为一种潜在的维护方法的文献。本文的目的是确定每个能源效率维护策略的主要概念和共同原则。设计/方法/方法对维护和能源效率进行了文献综述。本文系统地将文献分为三种维护策略(如基于检查的维护[IBM]、基于时间的维护[TBM]和基于状态的维护[CBM])。对各种维护策略的概念和原理进行了识别、比较和讨论。每个维护策略的主要概念和原则是基于以下标准确定的:所需的数据和收集,数据分析/建模和决策。IBM依靠人的感官和常识来检测能源故障。任何检测到的能量损失都被量化为能量成本。投资回收期分析通常用于证明纠正措施的合理性。另一方面,CBM监测指示能源绩效指标(enpi)的相关参数。需要数据分析或退化建模来识别能量退化。对于诊断方法,将能量退化与阈值进行比较,以证明纠正维护的合理性。预测方法估计能量退化何时达到阈值;因此,可以合理规划维护任务。另一方面,隧道掘进机使用能量监测的历史数据。识别退化需要数据分析或退化建模。执行进一步的分析以找到执行维护任务的最佳时间。本文还讨论了内务管理、IBM和CBM之间的比较。实际意义关于能效维护策略分类的文献是有限的。另一方面,ISO 50001能源管理体系标准显示了维护能源效率(MFEE)的重要性。因此,本文提出的维修策略的概念和原则,将有助于业界在实施ISO 50001标准时,将维修策略作为节能措施加以应用。本文的新颖之处在于深入讨论了能源效率的每种维护策略(例如内务管理或IBM, TBM和CBM)的概念和原则。并对每种维护策略的相关文献进行了总结。此外,还提出了维护策略选择的基本原则。
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引用次数: 1
A study on factors affecting the wear of steel track undercarriage 影响钢履带底盘磨损因素的研究
IF 1.5 Q2 Engineering Pub Date : 2023-02-03 DOI: 10.1108/jqme-10-2021-0081
Frederick A. Rich, A. Shahhosseini, M. A. Badar, Christopher J. Kluse
PurposeReducing wear of undercarriage track propulsion systems used in heavy construction equipment decreases the maintenance costs and increases the equipment's life. Therefore, understanding key factors that affect the wear rate is critical. This study is an attempt to predict undercarriage wear.Design/methodology/approachThis research analyzes a sample of track-type dozers in the eastern half of North Carolina (NC), USA. Sand percentage in the soil, precipitation level, temperature, machine model, machine weight, elevation above sea level and work type code are considered as factors influencing the wear rate. Data are comprised of 353 machines. Machine model and work code data are categorical. Sand percentage, elevation, machine weight, average temperature and average precipitation are continuous. ANOVA is used to test the hypothesis.FindingsThe study found that only sand percentage has a significant impact on the wear rate. Consequently, a regression model is developed.Research limitations/implicationsThe regression model can be used to predict undercarriage wear and bushing life in soils with different sand percentages. This is demonstrated using a hypothetical scenario for a construction company.Originality/valueThis work is useful in managing maintenance intervals of undercarriage tracks and in bidding construction jobs while predicting machine operating expense for each specific job site soil makeup.
目的减少重型建筑设备起落架轨道推进系统的磨损,降低维护成本,延长设备寿命。因此,了解影响磨损率的关键因素至关重要。这项研究试图预测起落架的磨损情况。设计/方法/方法本研究分析了美国北卡罗来纳州东半部的履带式推土机样本。土壤中的沙子百分比、降水水平、温度、机器型号、机器重量、海拔高度和工作类型代码被认为是影响磨损率的因素。数据由353台机器组成。机器模型和工作代码数据是分类的。砂率、高程、机器重量、平均温度和平均降水量是连续的。方差分析用于检验该假设。研究发现,只有含砂率对磨损率有显著影响。因此,开发了一个回归模型。研究局限性/含义回归模型可用于预测不同含砂率土壤中的起落架磨损和衬套寿命。这是用一个建筑公司的假设场景来演示的。独创性/价值这项工作有助于管理底盘轨道的维护间隔和投标施工作业,同时预测每个特定作业现场土壤组成的机器操作费用。
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引用次数: 0
Modular maintenance instructions architecture (MMIA) 模块化维护指令体系结构(MMIA)
IF 1.5 Q2 Engineering Pub Date : 2023-01-31 DOI: 10.1108/jqme-08-2021-0063
K. V. Sigsgaard, J. K. Agergaard, N. Mortensen, K. B. Hansen, J. Ge
PurposeThe study consists of a literature study and a case study. The need for a method via which to handle instruction complexity was identified in both studies. The proposed method was developed based on methods from the literature and experience from the case company.Design/methodology/approachThe purpose of the study presented in this paper is to investigate how linking different maintenance domains in a modular maintenance instruction architecture can help reduce the complexity of maintenance instructions.FindingsThe proposed method combines knowledge from the operational and physical domains to reduce the number of instruction task variants. In a case study, the number of instruction task modules was reduced from 224 to 20, covering 83% of the maintenance performed on emergency shutdown valves.Originality/valueThe study showed that the other methods proposed within the body of maintenance literature mainly focus on the development of modular instructions, without the reduction of complexity and non-value-adding variation observed in the product architecture literature.
目的本研究分为文献研究和个案研究两部分。在这两项研究中都确定了需要一种方法来处理指令复杂性。本文提出的方法是在文献方法和案例公司经验的基础上发展起来的。设计/方法/方法本文提出的研究目的是研究如何在模块化维护指令体系结构中连接不同的维护领域,以帮助降低维护指令的复杂性。该方法结合了操作和物理领域的知识,减少了指令任务变体的数量。在一个案例研究中,指令任务模块的数量从224个减少到20个,覆盖了83%的紧急关闭阀维护。独创性/价值研究表明,在维护文献中提出的其他方法主要集中在模块化指令的开发上,而没有降低产品架构文献中观察到的复杂性和非增值变化。
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引用次数: 0
Process modeling for decomposition unit of a UFP for reliability indices subject to fail-back mode and degradation UFP分解单元在故障恢复模式和退化条件下可靠性指标的过程建模
IF 1.5 Q2 Engineering Pub Date : 2023-01-31 DOI: 10.1108/jqme-01-2022-0008
Amit Kumar, M. Ram
PurposeEnsuring safe operation of a urea fertilizer plant (UFP) is a vital aspect for its functioning and production. Clearly the safe operation of such systems can only be archived with proper and effective maintenance scheduling and through controlling its failures as well as repairs of the components. Also for this, the concern plant management must have the information regarding the failures that affects the system's performance most/least. The objective of this study is to analyze mathematically the factors that are responsible for the failure/degradation of the decomposition unit of UFP.Design/methodology/approachThe considered system has been modeled by the aid of Markov's birth–death process with two types of failures for its components: variable (which are very similar in practical situations) and constant. The mathematical model is solved by the help of Laplace transform and supplementary variable technique.FindingsIn the present paper, the availability, reliability and mean time to failure (MTTF) are computed for the decomposition unit of the UFP. The critical components that affect the reliability and MTTF of the decomposition unit are identified through sensitivity analysis.Originality/valueIn this paper, a mathematical model based on the working of the decomposition unit of a UFP has been developed by considering two types of failure, namely, variable failures rates and constant failure rates (which has not been done in the literature for the decomposition unit). Conclusions in this paper are good references for the improvement of the same.
目的确保尿素化肥厂(UFP)的安全运行是其运行和生产的一个重要方面。显然,只有通过适当有效的维护计划以及控制其故障和部件维修,才能确保此类系统的安全运行。此外,相关工厂管理层必须掌握对系统性能影响最大/最小的故障信息。本研究的目的是从数学上分析导致UFP分解单元故障/退化的因素。设计/方法/方法所考虑的系统是通过马尔可夫的出生-死亡过程建模的,其组件有两种类型的故障:变量(在实际情况下非常相似)和常量。利用拉普拉斯变换和辅助变量技术对数学模型进行求解。本文计算了UFP分解单元的可用性、可靠性和平均失效时间。通过灵敏度分析,确定了影响分解单元可靠性和MTTF的关键部件。独创性/价值在本文中,通过考虑两种类型的故障,即可变故障率和恒定故障率(在分解单元的文献中没有这样做),开发了一个基于UFP分解单元工作的数学模型。本文的研究结论对该方法的改进有很好的参考价值。
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引用次数: 0
Taxonomy of candidate’s selection for prioritized predictive maintenance in maintenance, repairs and overhaul organizations 在维护、维修和检修组织中优先预测性维护候选人的选择分类
IF 1.5 Q2 Engineering Pub Date : 2022-10-06 DOI: 10.1108/jqme-04-2022-0022
R. Fedorov, D. Pavlyuk
Purpose Research questions: Is there a systemic relationship between different methods of screening candidates for predictive maintenance? How do the goals of a predictive project influence the choice of a dropout method? How do the company’s characteristics implementing the predictive project influence the selection of the dropout method?Design/methodology/approach The authors described and compiled a taxonomy of currently known methods of screening candidate aircraft components for predictive maintenance for maintenance, repairs and overhaul organizations; identified the boundaries of each way; analyzed the advantages and disadvantages of existing methods; and formulated directions for further development of methods of screening for maintenance, repairs and overhaul organizations.Findings The authors identified the relationship between various screening methods by developing the approach proposed by Tiddens WW and supplementing it with economic methods. The authors built them into a single hierarchical structure and linked them with the parameters of the predictive project. The principal advantage of the proposed taxonomy is a clear relationship between the structure of the screening methods and the goals of the predictive project and the characteristics of the company that implements the project.Originality/value The authors of the article proposed groups of screening methods for predictive maintenance based on economic indicators to improve the effectiveness and efficiency of the screening process.
目的研究问题:筛选预测性维护候选人的不同方法之间是否存在系统关系?预测性项目的目标如何影响辍学方法的选择?公司实施预测项目的特点如何影响辍学方法的选择?设计/方法论/方法作者描述并汇编了目前已知的筛选候选飞机部件的方法分类法,用于维护、维修和大修组织的预测性维护;确定了每种方式的边界;分析了现有方法的优缺点;并制定了进一步发展维护、维修和大修组织筛选方法的指导方针。研究结果作者通过发展Tiddens WW提出的方法并补充经济方法,确定了各种筛选方法之间的关系。作者将它们构建成一个单一的层次结构,并将它们与预测项目的参数联系起来。所提出的分类法的主要优点是筛选方法的结构和预测项目的目标与实施项目的公司的特征之间有着明确的关系。原创性/价值文章作者提出了一组基于经济指标的预测性维护筛查方法,以提高筛查过程的有效性和效率。
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引用次数: 0
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Journal of Quality in Maintenance Engineering
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