Failure Analysis through Behaviour of Machines

Almost all machines or equipment whether electrical or mechanical or electronic, assumed to behave in the same manner. These machines are normally expected to have one of the three types of behaviours with references to the failures that occur. These three behaviours are as follows:

• The rate of failures is decreasing, i.e. Decreasing Failure Rate or DFR (Decreasing Trend - Machine Condition is Improving).
• The rate of failures is constant, i.e. Constant Failure Rate or CFR (No Trend Machine Condition may or may not be consistent but machine is giving required average output).
• The rate of failures is increasing, i.e. Increasing Failure Rate or IFR (Increasing Trend - Machine Condition is Deteriorating).

Amazingly, every machine is found to have all the three behaviours significantly and distinctly in certain period of its lifetime. Therefore, it has gained so much significance in replacement analysis and trend analysis studies.