الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 69 |  |  |
| | | from | 69 | | |
Abstract
System Reliability is one of the key factors for success, especially nowadays, where the market is very challenging and competition is extremely high. Unreliable system may cause a lot of unexpected direct and indirect losses. These loses could be due to accidents, penalties for not meeting delivery due dates, defected products, stoppage time, labors’ health or machine breakdown.
Overall system reliability can be achieved through the reliability of its components. When considering production systems, main components of the system are expressed by human and machine for which reliability has to be maintained. Although there is a combination between performance of both human and machine, each of them has its own work rules, potentials and limitations. The effectiveness of the system as a whole is determined by the extent to which the characteristic features of the human and the machine, both limitations and potentials, are identified and taken into account when judging the system.
The main objective of this study is to evaluate Integrated Human-Machine System ReHability ”IHMSR” through integrating each of human and machine reliabilities. To do this an extended approach is described. This approach is based on calculating the ”IHMSR” through integrating human reliability; measured using 1) work efficiency, 2) success rate through HEART method and 3) time efficiency by recording wasted time while machine reliability is measured using; 1) production efficiency, 2) success rate through quality measure for number of defectives and 3) time efficiency that could be calculated using Mean Time Between Failures ”MTBF”, Mean Time To Repair ”MTIR”. Selection of the method to be used for the calculation of human and machine reliabilities is based on the three main factors required to achieve reliability; 1) fimction (quantity and quality), 2) time and 3) operation and environmental conditions (usually fixed). Human and machine reliabilities integration is done by drawing system Reliability Block Diagram ”RBD” then calculating total reliability based on human and machine interaction defined by the ”RBD”.
The proposed IHMSR evaluation approach is implemented in one of the multinational companies located in Egypt which is a leading company in the sector of nutrition products. Each production line is responsible for a family of products. Production plan is set based on the factory orders and stock levels. This makes reliability a critical issue to be able to meet market demand and fulfill the requested orders; otherwise, company will face both direct and indirect losses; due to system unreliability causing production delays or any other unachieved targets. Data was collected from one of the work stations in the factory. Evaluating this data through applying the proposed rnSMR approach, it was found that the work station is reliable.
Keywords
Human Reliability, Machine Reliability, System Reliability