Sample%20Paper - A NASA Predictive Safety Model Michael...

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A NASA Predictive Safety Model Michael Camet and Rolando Quintana; The University of Texas at El Paso Bhupendra Deliwala, Kennedy Space Center, NASA Abstract A proactive methodology for accident prevention, called Continuous Hazard Tracking and Failure Prediction Methodology (CHTFPM), has been developed by utilizing the principles of work sampling and control charting. Sampling is performed to observe the occurrence of conditions that may become hazardous in a given system. These conditions, known as dendritics, could eventually result in an accident or occupational disease. The CHTFPM involves a random sampling for the occurrence of these dendritics. The collected data is then used to generate a control chart. Based on the pattern of the control chart, a system “under control” is not disturbed whereas a system “out of control” is investigated for potential conditions becoming hazardous. Appropriate steps can then be taken to eliminate or control these potentially dangerous and costly conditions to maintain a safe system. Introduction The formal methods of hazard analysis can be divided into two broad categories: inductive and deductive (National Safety Council, 1992). The inductive method forms the basis for such analysis as failure mode & effect analysis (FMEA), and operation hazard analysis (OHA). These methods emphasize the mode of failure, the triggering event(s) and the ultimate impact on people and property (National Safety Council, 1992). If inductive analysis details what can happen, deductive analysis informs how. An example would be fault tree analysis (FTA). It postulates failure of the entire system and then identifies how they contribute to the failure (National Safety Council, 1992). However, the formal methods are limited in their effectiveness as they only come into picture once an accident has taken place. They are like a post-mortem report that identifies what happened and how it happened. They do not provide real time information on whether the conditions in a system are becoming hazardous, which may finally lead to an accident, an injury, or an occupational disease. Present safety methodologies basically provide feedback on hazards after accidents have happened. But what is required is a concept that indicates that the system under consideration is becoming hazardous. This information would facilitate to check and eliminate the hazard before accidents can happen. This research espouses one such concept, namely Continuous Hazard Tracking and Failure Prediction Methodology (CHTFPM), which studies the system for occurrence of conditions becoming hazardous and takes steps to eliminate these conditions when their occurrence crosses certain preset limits or when they show an unnatural pattern. The concepts underlying this proactive approach to industrial safety are derived from work sampling and control chart theories. These theories emphasize a cost effective way of keeping a continuous check on the safety status of the system under consideration. CHTFPM involves a planned, systematically organized, and
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This note was uploaded on 06/14/2011 for the course HIST 1301 taught by Professor Gonzales during the Spring '11 term at The University of Texas at San Antonio- San Antonio.

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Sample%20Paper - A NASA Predictive Safety Model Michael...

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