scholarly journals Pemeliharaan Mesin Hydraulic Shear Menggunakan Pendekatan Reliability Centered Maintenance dan Manajemen Suku Cadang

2020 ◽  
Vol 9 (3) ◽  
pp. 153-162
Author(s):  
Faisal Mustaqim ◽  
Wilson Kosasih ◽  
Ahmad Ahnad
Keyword(s):  
Negative Impact ◽  
Operating Time ◽  
Labor Cost ◽  
Spare Parts ◽  
Production Equipment ◽  
Time Interval ◽  
Machine Component ◽  
Reliability Centered Maintenance ◽  
Machine Reliability ◽  
Hydraulic Shear

Production equipment that has a high operating time becomes a vital aspect in supporting the operational system, and its maintenance becomes a critical point that must be planned. This research discusses maintenance policies that focus on machine reliability and parts availability to produce proper maintenance actions, optimal maintenance scheduling and good spare-parts management. The research was conducted on a developing manufacturing company engaged the field of agricultural aids in the city of Bekasi. This study focused on hydraulic shear machines because they have the largest downtime value of 8,344.8 minutes. This problem has a negative impact on the company because it can reduce the yield. Based on these conditions, the study was conducted using the Reliability Centered Maintenance method to update the maintenance patterns and Poisson Process to determine the number of component requirements needed for the next one year. The data obtained in the form of historical damage to the machine, component cost, labor cost and production cost. This research produces an optimal preventive replacement time interval that is every 154 hours for the oil seal component, 242 hours for the shear blade component, and 324 hours for the oil hydraulic hose (1/2") component. While the number of critical components required for the next 1 year is 37 units for oil seal component, 10 units for shear blade components, and 7 units for oil hydraulic hose (1/2") component.

scholarly journals Application of Markov processes for analysis and control of aircraft maintainability

2020 ◽  
Vol 23 (1) ◽  
pp. 71-83
Author(s):  
Yu. M. Chinyuchin ◽  
A. S. Solov'ev
Keyword(s):  
Markov Chain ◽  
Markov Chains ◽  
Markov Processes ◽  
Operating Time ◽  
Operation Time ◽  
Spare Parts ◽  
Time Interval ◽  
Maintenance And Repair ◽  
Stationary Markov Chain ◽  
And Control

The process of aircraft operation involves constant effects of various factors on its components leading to accidental or systematic changes in their technical condition. Markov processes are a particular case of stochastic processes, which take place during aeronautical equipment operation. The relationship of the reliability characteristics with the cost recovery of the objects allows us to apply the analytic apparatus of Markov processes for the analysis and optimization of maintainability factors. The article describes two methods of the analysis and control of object maintainability based on stationary and non-stationary Markov chains. The model of a stationary Markov chain is used for the equipment with constant in time intensity of the events. For the objects with time-varying events intensity, a non-stationary Markov chain is used. In order to reduce the number of the mathematical operations for the analysis of aeronautical engineering maintainability by using non-stationary Markov processes an algorithm for their optimization is presented. The suggested methods of the analysis by means of Markov chains allow to execute comparative assessments of expected maintenance and repair costs for one or several one-type objects taking into account their original conditions and operation time. The process of maintainability control using Markov chains includes search of the optimal strategy of maintenance and repair considering each state of an object under which maintenance costs will be minimal. The given approbation of the analysis methods and maintainability control using Markov processes for an object under control allowed to build a predictive-controlled model in which the expected costs for its maintenance and repair are calculated as well as the required number of spare parts for each specified operating time interval. The possibility of using the mathematical apparatus of Markov processes for a large number of objects with different reliability factors distribution is shown. The software implementation of the described methods as well as the usage of tabular adapted software will contribute to reducing the complexity of the calculations and improving data visualization.

Application of Multifunctional Materials for Machine Tool Structures

2009 ◽  
Author(s):  
Francesco Aggogeri ◽  
Angelo Merlo ◽  
Marco Mazzola ◽  
Nicola Pellegrini
Keyword(s):  
Thermal Stability ◽  
Machine Tool ◽  
Metal Foam ◽  
Operating Time ◽  
Weight Ratio ◽  
Material Behavior ◽  
Time Range ◽  
Machining Accuracy ◽  
Machine Component ◽  
Latent Heat Storage

The competition on the international markets pushes manufacturers towards shorter design cycles and decreasing manufacturing times and costs for their products. This trend generates a demand for smart, flexible and faster machining systems, easy to set up and configure, which are able to drastically reduce machining time and improve the final accuracy. This paper rises from these considerations evaluating the possible application of multifunction materials in machine tool (MT) design and building. These solutions can provide a fundamental impact on functionality and reliability of a manufacturing system. In particular, use of innovative materials in today’s technology continues to grow steadily. Numerous reasons for this growth include light weight, superior insulating abilities, energy absorbing performance, excellent strength/weight ratio and low cost. This paper aims to investigate a possible application of multifunction materials in realisation of structure components for Machine Tools. There are many aspects that affect the machining accuracy and the cutting conditions of a high performance MT. The most important issues are related to the static, dynamic, mechatronic and thermal behavior of the machines. In particular, a strict requirement that a machine tool has to fulfill in order to drastically reduce operating time while improving the final accuracy is the thermal stability. This paper shows a complete study and testing validation on prototypes (plates and beam) based on sandwiches with core made of metal foam (open and closed cells) materials impregnated by a PCM (Phase Material Change) wax. Metal foams represent a class of materials with low density and novel physical, mechanical, thermal, electrical and acoustic proprieties. They offer potential for lightweight structures, for energy absorption and thermal management. PCMs are latent heat storage materials that absorb heat keeping constant the temperature of a machine component in a defined time range. The authors have designed, realized and tested the prototypes developing thermal trials, and then evaluating the comparison between experimental data and simulative analysis (FEM). The trials consisted to process the prototypes at a variation of temperature in order to assess the PCM proprieties to absorb heat and maintain thermal stability in a defined time range. The paper shows also a simulative study on PCM material behavior and their application in MT design supported by experimental trials and data analysis. The significant advantages and perspectives that can be obtained in applying of these MT structures complete the developed study.

Maintenance of Power Equipment System Based on the Methods of Diagnosis and Control of Technical Condition

2018 ◽  
pp. 421-448 ◽  
Author(s):  
Dmitry Strebkov ◽  
Alexey Nekrasov ◽  
Anton Nekrasov
Keyword(s):  
Operating Time ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Spare Parts ◽  
Actual Condition ◽  
Power Equipment ◽  
Service Strategy ◽  
Electrical Systems ◽  
Preventive Actions ◽  
Equipment System

Maintenance of the power equipment system is based on the industry standard of averaged volumes of standard maintenance and repair of power equipment, frequency and duration of the preventive measures, the nomenclature and consumption of materials and spare parts to perform operations. One of the more efficient uses of electrical equipment is to improve its maintenance system through the development and implementation of service strategies for the actual condition. The work proved the necessary conditions for the realization of electric service strategy on defining the main diagnostic parameter. The general mathematical model is proposed to implement the service strategy. The model is based on a study of basic parameters using random monotone normal type of process and diagnostic controlled parameter with three discrete product states (working, the state of preventive actions, and failure) and continuous operating time. The results of studies of the new techniques development for improving the operation of electrical systems are presented.

Optimization of Gross Margin in Outsourcing of Management of Inventory of Spare Parts of Production Equipment

2014 ◽  
Vol 708 ◽  
pp. 173-177
Author(s):  
Stanisław Brzeziński ◽  
Katarzyna Grondys
Keyword(s):  
Value Added ◽  
Research Problem ◽  
Spare Parts ◽  
Production Equipment ◽  
Gross Margin ◽  
The Subject ◽  
The Individual

The subject of the paper is the presentation of the case-study of the company outsourcing the spare parts stock. As the result of the changes in the agreement between the outsourcer and the large commissioning company, the task of the outsourcing company was to standardize the margin for the individual groups of products, so far highly diversified. The research problem was to analyze the development of margins using CVA (Cash Value Added) analysis and to establish such a level of the above which will satisfy the client’s requirements and provide further employment and generating profit for the outsourcing company.

scholarly journals Determining Optimal Replacement Policy with an Availability Constraint via Genetic Algorithms

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Shengliang Zong ◽  
Guorong Chai ◽  
Yana Su
Keyword(s):  
Genetic Algorithm ◽  
Average Cost ◽  
Operating Time ◽  
Threshold Value ◽  
Replacement Policy ◽  
Time Interval ◽  
Cost Rate ◽  
Optimal Replacement ◽  
Optimal Replacement Policy ◽  
Average Cost Rate

We develop a model and a genetic algorithm for determining an optimal replacement policy for power equipment subject to Poisson shocks. If the time interval of two consecutive shocks is less than a threshold value, the failed equipment can be repaired. We assume that the operating time after repair is stochastically nonincreasing and the repair time is exponentially distributed with a geometric increasing mean. Our objective is to minimize the expected average cost under an availability requirement. Based on this average cost function, we propose the genetic algorithm to locate the optimal replacement policyNto minimize the average cost rate. The results show that the GA is effective and efficient in finding the optimal solutions. The availability of equipment has significance effect on the optimal replacement policy. Many practical systems fit the model developed in this paper.

Traffic Overflow Modeling and Numerical Simulation

2012 ◽  
Vol 241-244 ◽  
pp. 2072-2075
Author(s):  
Jing Shan Pan ◽  
Li Dong Zhang
Keyword(s):  
Numerical Simulation ◽  
Traffic Flow ◽  
Queue Length ◽  
Flow Model ◽  
Negative Impact ◽  
Intrinsic Factor ◽  
Time Interval ◽  
Effective Solution ◽  
Traffic Flow Model ◽  
Simulation Results

Traffic overflow has great negative impact on normal traffic flow. Improper time setting and offset, even more right turn input traffic flow can cause this extreme phenomenon. In order to discover the intrinsic factor and relationship between overflow and signal setting, traffic flow incoming, we build the traffic flow model. This model takes two adjacent crosses as example, and to count the remained traffic flow queue length in given time interval. The simulation results prove our model’s feasibility. Our model well helps us to understand the overflow characteristics and to find the effective solution to conquer it in the future.

scholarly journals Management of the Documentation Release by the Programmable Electrical Energy Flow-Individually Made Machine Called Documentomat

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5304
Author(s):  
Tomasz Chajduga ◽  
Manuela Ingaldi ◽  
Dorota Klimecka-Tatar
Keyword(s):  
Limited Liability ◽  
Electrical Energy ◽  
Labor Cost ◽  
Theoretical Concept ◽  
Spare Parts ◽  
Machine Building ◽  
High Security ◽  
Concept Of Information ◽  
Security Standards ◽  
The Impact

It is well known that in a turbulent world (full of processed information), information has a particularly high value. Wide access to technology makes the data transformation and transmission processes faster and more vulnerable to leaks and unauthorized access. This publication discusses the concept of information security management based on a development of a machine called documentomat. It is the machine built to automatically release documents with regard to high security standards. The entire flow of the documents in the company has been presented and the formalized process of decision-making to develop and finally build above-mentioned machine was described. The problems and doubts raised during the machine building process were presented along with the solutions adopted. The device has been designed, constructed, and programmed within the resources of one micro-sized limited liability company in Europe. Thus, it is the solution working in a real world that may find application in many similar companies, not the theoretical concept only. The final result exceeded the expectations of the project team, leading to strengthening of the competitive position of the company. This occurred through the following aspects: adding significant advantage to its offer, which is the ability to release the documents at any time with regard to high security standards. Moreover, the long-term level of costs of such a solution seems to be very low. During the one year of operation period, two malfunctions took place, each was repaired in just 3 h (repair and improvement, labor only, no spare parts needed). Any further maintenance, repair, or development can be done at very affordable prices, at non-available on the market labor cost, which will potentially further strengthen the impact of the solution on the competitiveness of the company. Improvement in terms of competitiveness of the company and data safety has been gained. The success of this project proves that, in some cases, it is worth to develop the necessary solution within the resources of the company rather than buying one from an external enterprise.

scholarly journals Timeseries Analysis of the Financial Liberalization and Pre-Crisis Indicators in Turkish Economy

2017 ◽  
Vol 5 (2) ◽  
pp. 141
Author(s):  
Ömer Uğur Bulut ◽  
Sadık Rıdvan Karluk
Keyword(s):  
Interest Rates ◽  
Financial Liberalization ◽  
Negative Impact ◽  
Var Model ◽  
Time Interval ◽  
Real Interest Rates ◽  
Credit Growth ◽  
Turkish Economy ◽  
Causality Relationship ◽  
Hot Money

<p><em>In our study, the selected financial liberalization and pre-crisis indicators which is inspired by the </em><em>work of Kaminsky, Lizondo and Reinhart known as KLR approach is analyzed. For Turkish economy, </em><em>the completion of the financial liberalization process in the time interval after 1989, the effects of shock, </em><em>causality relationship and interact with each of these indicators is surveyed through the VAR model </em><em>and Toda-Yamamoto test. The purpose of this study to show that financial liberalization indicators of</em><br /><em>hot money movements, real interest rates and credit growth triggered the crisis which were </em><em>experienced in Turkey after 1989 by adversely effecting the pre-crisis indicators. In addition to this </em><em>purpose, the most effective indicators of financial liberalization on pre-crisis indicators will be </em><em>determined for Turkish economy. According to VAR model and Toda-Yamamoto causality test, the </em><em>negative impact on the pre-crisis indicators, description of these indicators percentage and the </em><em>causality relationship of hot money movements and real interest rates are more than the credit growth. </em><em>The results will give ideas on policy makers in Turkey about the effectiveness of the financial </em><em>liberalization in economic crises.</em></p>

scholarly journals PERENCANAAN PEMELIHARAAN MOTOR DIESEL DENGAN METODE RCM (RELIABILITY CENTERED MAINTENANCE) PADA PLTG TELUK LEMBU PEKANBARU

2020 ◽  
Vol 7 (1) ◽  
pp. 77-85
Author(s):  
Darno
Keyword(s):  
Power Plant ◽  
Electrical Energy ◽  
Electricity Production ◽  
Time Interval ◽  
Time To Failure ◽  
Generator System ◽  
Reliability Centered Maintenance ◽  
Optimal Maintenance ◽  
Gas Power Plant ◽  
Mean Time

Teluk Lembu Gas Power Plant (PLTG) is one type of power plant that uses the power of burning fuel and high pressure air. To be able to meet the needs of electrical energy on the island of Sumatra, especially in the Riau region,electricity production must not experience a decrease in productivity due to equipment damage. Obstacles that arise are frequent downtime unexpectedresulting in  the production  of electricity is  interrupted or  even  to  cause derating caused by damage to the operational when the engine is running. This study aims to provide recommendations  for  equipment  maintenance  andtime  intervals  optimal  inspectionin  the generator system. The research method used is Reliability Centered Maintenance (RCM) withanalysis  quantitative.  Where  are  the  stages  of  implementing the  RCM  method,  namely determining thecomponents criticalin the PLTG generator engine, determining thevalues, determining the Mean Time to Failure (MTTF) and Mean Time to Repair (MTTR)time interval optimal maintenance,  and making a table of  causes of damage to  thecomponents  generator engine. After analyzing it, it was found that thecomponent criticalof PLTG Teluk Lembu is the Diesel Motor. This is obtained based on the component with the highest frequency of damage, namely 13 damage during a period of 1 year. From the results of data processing, it is obtained that the MTTF value is 0.92441 hours and the MTTR value is 0.89014 hours. Theinspection time interval optimalis 25 days, so it is advisable to carry out Corrective and Preventive maintenance activities for Diesel Motorcycles periodically every 25 days (PM 25D) in order to increase the reliability of the Diesel Motor

scholarly journals TO THE QUESTION OF THE POSSIBILITY OF DEVELOPING TOOLS AND METHODS FOR INSTRUMENTAL DIAGNOSTICS OF HEAT EXCHANGERS OF TRANSPORT EQUIPMENT IN OPERATION

2021 ◽  
pp. 60-67
Author(s):  
A.P. Poslavsky ◽  
◽  
V.V. Sorokin ◽  
A.A. Fadeev ◽  
◽  
...  
Keyword(s):  
Heat Exchangers ◽  
Objective Assessment ◽  
Operating Time ◽  
Basic Structure ◽  
Technical Condition ◽  
Practical Significance ◽  
Time Interval ◽  
Problem Situation ◽  
Resource Saving ◽  
Diagnostic Support

Heat exchangers are used to stabilize and maintain the temperature regime of various units and systems of cars. The technical condition of heat exchangers in operation is different and unstable. At a certain operating time interval, the technical condition of any of the heat exchangers can become limiting due to the influence of various kinds of operational factors. The article analyzes the possibility of improving the means and methods of diagnostic support of automobile heat exchangers in operation. In the design and manufacture of automotive heat exchangers, they are tested in specialized laboratories equipped with test stands characterized by high capital and operating costs. The use of these stands for diagnosing heat exchangers in operation is not applicable. Due to the limitations and imperfections of the known methods and means of diagnosing automobile heat exchangers in operation, an objective assessment of their current technical condition is difficult and requires the search for new, more advanced diagnostic options. The relevance of the topic of the article lies in the search for ways to improve the diagnostic support, adapted for a quantitative assessment of the technical condition of heat exchangers in operation. The aim of the work is to improve the method and means of diagnosing heat exchangers in operation on the basis of modernizing the design of the test bench for radiator modules. Potentially a possible upgrade option was chosen previously developed by the authors stand for testing modules of automobile radiators, which is distinguished by the effect of resource saving when obtaining the test result. Achievement of the goal requires updating the architecture of the structural elements of the stand, and the search for design and technological solutions that contribute to the achievement of the goal. The methodological research toolkit is based on dialectically interrelated methods: analysis of a problem situation and subsequent design and technological synthesis. Scientific novelty lies in the development of conditions for modernization, allowing to expand the functionality of the basic structure of the stand. The practical significance of the results lies in the choice of the direction of research, with a new set of technical proposals and conditions for achieving the goal of the work.

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