Ebeling - An Introduction to Reliability and Maintainability Engineering () - Ebook download as PDF File .pdf) or view presentation slides online. Mar 30, eBooks Download An Introduction to Reliability and Maintainability Engineering (PDF, ePub, Mobi) by Charles E. Ebeling Complete Read Online. Reliability FMECAFailure Mode Effects and Criticality Analysis Reliability Programs FMEA/ FMECA Reliability Prediction.
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Theory and Practice. Failure effects can focus on the specific block diagram element which is affected by the failure under consideration. Reliability Engineering: Close Send. Introduction to Logistics Engineering. As part of the maintainability analysis, critical to its undertaking, is the importance that detection and isolation is accurately reflected in the overall Mean Time To Repair calculations. Forgot your username?
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Volume 14 , Issue 4 Special Issue: Related Information. Email or Customer ID. Forgot password? Old Password. New Password. The failure modes with their assigned criticality would be seen as basic events.
Testability Engineering: This information can be used to support a fault diagnostics procedure or validate the effectiveness of an equipment built in test capability.
Additionally, associated with safety, critical failure modes maybe identified that would otherwise go undetected , presenting themselves as potential hazards. Maintainability Engineering: As part of the maintainability analysis, critical to its undertaking, is the importance that detection and isolation is accurately reflected in the overall Mean Time To Repair calculations. Logistics Engineering: For each failure mode occurrence a resulting corrective maintenance task would be implemented.
Therefore the occurrence of failure modes, which are caused by wearout characteristics would be identified and used to supplement the RCM effort. Availability Engineering: If a complex system architecture is developed, such as a high availability system employing the use of redundant elements, the FMECA is paramount in ensuring that there are no failure modes in the architecture that would degrade the final availability.
This could be most beneficial in sensitive areas such as redundant cross over points potential single point failures etc. Design Engineering: The FMECA would support the design engineering effort to ensure that program design requirements are addressed.
These could be in the support of requirements such as no single points of failure etc. Earlier in a design process a functional analysis approach would be taken.
With better definition of the design and as more details are firmed up then this will permit a physical analysis to be implemented.
The level or detail to which the FMECA should be performed would be based upon the purpose and objectives of the analysis.
This may mean that certain elements in a system architecture are analyzed to no lower than a higher functional level, or in the case of safety critical elements the FMECA maybe required to be developed to include the failure modes of peace part or discrete components.
Example higher functional level failure modes: A power distribution network, consisting of redundant elements.
The http: Used in a pyrotechnic firing circuit employed in safety equipment, deployed on an off-shore oil and gas rig. It maybe be necessary to analyse all of the components associated with this circuit and their individual failure modes, giving full consideration to the possible effects due to its operating environment and the dormancy.
These components could include the pyrotechnic device itself, wiring harnesses, electronic sensor and firing mechanism.
Failure Modes The following is a general list of the failure modes of various components. This military specification should be referred to understand each column used and their full definition.
Failure effects can focus on the specific block diagram element which is affected by the failure under consideration. The failure under consideration may impact the several indenture levels, from Local Effects, Next Higher Level Effects and End Effects, as described below.
Once again using the relay failure mode example this loss of the Motor Starter Capability at the system level would, cause the loss of an electric motor. If the motor was be used for a Lathe in a factory, it maybe not so critical. If the Motor was be used in the guidance steering function of a remote robotic manipulating arm then it could be more critical or severe.
It should be noted that although the definitions of each severity classification category tend to be heavily biased to a military application, they could also be adapted to address commercial concerns, for example: The failure detection means, such as visual or audible warning devices, automatic sensing devices, sensing instrumentation or none will be identified. This action may include the switching to a system's redundant element. On the other hand the maintainer would be interested in isolating the failure to the element that would allow for a corrective maintenance action to be implemented.
This may be to the offending Line Replacement Unit or assembly. Notes regarding recommendations for design improvements shall be recorded and further amplified in the FMECA report Criticality Analysis The purpose of the Criticality Analysis is to rank each failure mode as identified in the FMEA, according to each failure mode's severity classification and its probability of occurrence. The result of the Criticality Analysis will leads itself to the development of a Criticality Matrix.
The failure mode criticality number for each specific failure mode Cm is calculated as follows: This criticality number is the sum of the specific failure mode criticality numbers related to the particular severity category: The criticality matrix displays the distribution of all the failure mode criticality numbers according to the severity category and referring to the criticality scale.
According to Mil-Std the scale is divided into five levels: Level A - Frequent. The high probability is defined as a probability which is equal or bigger than 0. Level B - Reasonable probable. The reasonable moderate probability is defined as probability which is more than 0.
Level C - Occasional probability. The occasional probability is defined as a probability, which is more than 0. Level D - Remote probability.