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Electronic Device Damage in Control Panel of Drilling Unit
Reliability of electronic circuit boards and electronic devices of console of drilling units are investigated. This new analytical method confirms modification of electronic device dynamic behaviour which installed in console of drilling unit. It is in agreement with experimental results which show electronic circuit board failure in driller console when dynamic loading is considerably less than values required to affect the board when board itself , lonely, is under vibration test.
Majority of failures of electronic equipment, instruments, sensors and sensitive devices are mechanical in nature. Typical failures caused by break, crack and creep. It is often quite difficult to determine main cause of malfunction and failure. Dynamic and vibration loads caused very large percent of sensitive equipment failures which installed in dynamic environment. Vibration failures are often difficult to trace. Usually resonance situations and coupling effects are involved. Sometimes it does not appear to be any connection between failed parts and vibration loadings.
The dynamic behaviour of electronic and electric device is a subject that has received considerable attention due to its technical importance. Analysis of electric / electronic devices or circuit boards under dynamic loading was presented previously. But only a limited number of contributions have been published on counteraction effects of complex systems (in this case drilling unit) and these devices. New analytical formulations to study modified dynamic behaviour of sensitive devices in a complex system (drilling unit) is presented. When a circuit board or electronic device is installed in a driller console, there will be complicated interactions between its dynamic characteristics and drilling unit dynamic behaviour. There are different dynamic responses and consequently much more possibilities of resonance. Electronic devices and electronic circuit boards are vulnerable against dynamic loading. For example for a drilling unit revamp project, vibration tests were conducted on electronic circuit board in a broad frequency range and with high vibration amplitudes. Tests were repeated however no damage was observed. During drilling unit site performance test, failure of electronic circuit board was occurred because of mechanical damage. The dynamic loading amplitude was considerably less than amplitude in vibration tests. Extensive investigation shows that failure was only due to modified dynamic behaviour of system.
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