Thursday, August 9, 2012

IE Article Review :- Improvement of the Reliability of Automatic Manufacture Systems by Using FTA Technique



National Institute of Industrial Engineering
 
Industrial Engineering (PGDIE-42)





Review Paper Summary on

Improvement of the Reliability of Automatic Manufacture Systems by Using FTA Technique







Submitted to                                                       Submitted by
Dr. KVSS Narayan Rao                                          Abhinav Gautam (Roll no-03)
                                   
            


                                                                                                       











Article Details:

Title:

 Improvement of the Reliability of Automatic Manufacture Systems by Using FTA Technique

Authors:

A.       Mahdi Karbasian,
B.      Mahdi Rostami Mehr,
C.      Mojgan Agharajabi

Published in:

International Journal of Industrial Engineering & Production Research,
 Volume 23, Number 2
Page no (85-89)
June 2012

Abstract


In recent years, many manufacturing industries for promoting their efficiency have tended to use the automatic manufacturing systems. Expanding automatic systems and to increase their complexity are representing the necessity of studying a proper functional quality and using reliable equipment in such systems more than ever. In this direction, the technique of fault tree analysis (FTA), along with using other techniques such as failure mode and effect analysis (FMEA) reveals the incorrect performance states (modes) in system in order to know these modes exactly may prevent their occurrence and increase their function quality. In this study, the approaches may increase the reliability of performance in an industrial robot are studied by FTA technique as a case study to show improvement in performance of equipments on automatic systems to reduce their destruction (fault) during the work, and finally access to an automatic manufacturing systems with high reliability.







 

Review

FBD Sketch to Four- Free Degree Robot
Determining the potential modes of destruction is required to know and analyze  the system perfectly. Here, there is the system of cannibalization having four free- degree that has been designed in order to move spares in the weight of maximum 500 gr [3].
In this robot have been used strong steel arms and seven serves of dc motor with the moment about 30 kg and much other electronic hardware.



FTA Plan
A Rooty conflict with maker elements of undesirable modes in the phase of planning will cause to promote the performance level in system. After recognition errors by FTA as a logical model from up to down such as designing assistant, the system analyzing may be considered, and possible destruction of system is evaluated. This analysis is followed by using three procedures:
1- To draw the fault tree.
2- To determine the possibility of fault
3- To know and estimating critical sets resulted in the occurrence of top event.

Drawing Reliability Block Diagram of System
By surveying RBD, we compute total reliability of system. Moreover, it is purposed to increase reliability of B1 and B2 components with respect to it is as series in system. But for computing reliability of electronic components, Mil – HDBK – 217 standard is used, and Mech Rel software is used for estimating reliability of mechanical pieces.

FMEA Plan to Present Proposed Measures
After finding potential fault modes, to prioritize and knowing the causes, are the next step. For this, the FMEA technique is used. This method is a systematic method of recognizing, and prioritizing the fault in a system or product. It acts according to the prevention law. One of the success elements in this technique is the time of its performance and has been planned it, that would be a measure before event, not an exercise after being revealed the difficulties.

Conclusion

By using the planned algorithm on the base of FBD, FTA and FMEA tools, the below results can be achieved:
1) Recognizing the potential fault roots in the first levels of planning.
2) Determining the cause of potential faults
3) Prioritizing of the faults for corrective actions
4) Performing of necessary actions in order to reduce or delete the potential Failure

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