Discrete event simulation (DES) is a powerful technique that can be used to to solve more complex system reliability modeling and supportability problems. This article discusses using the Discrete Event Simulation tool in the Reliability Analytics Toolkit for spare parts planning purposes.
Author Archives: Seymour Morris
Sequential Lot Acceptance Test Calculator
A sequential lot acceptance test calculator was recently added to the Reliability Analytics Toolkit. Sequential testing is a very efficient way of demonstrating lot quality with relatively few samples. The calculator tests the mean of the binomial distribution and can be applied where each unit is classified into one of two categories, good or defective. The underlying technique, developed during World War II, is based on the work of mathematician Abraham Wald while at Columbia University’s Statistical Research Group. Continue reading
Sequential Reliability Test Calculator
A Sequential Reliability Testing Calculator was recently added to the Reliability Analytics Toolkit. Sequential testing often provides a more efficient method to verify equipment reliability achievement. Really “good” equipment will be accepted much quicker and really “bad” equipment will be rejected much sooner, often resulting in fewer test hours needed than using a military handbook 781 fixed length reliability test. The tool provides the ability to plan a sequential reliability demonstration test for verification of equipment mean time between failure (MTBF) if it can be assumed that the equipment follows an exponential failure distribution (i.e., constant failure rate). Continue reading
Reliability “Standards” Search Tool
A new reliability engineering search tool was recently added to the Reliability Analytics Toolkit. This tool indexes, on a page level basis, approximately 30,000 pages from various reliability engineering “standards” (government standards, handbooks, guides and reports related to reliability, maintainability, availability, safety, etc.). The tool provides a more comprehensive search capability than the Google Custom Search box at the top of each page, which only outputs pages ranked high by Google, but not necessarily all pages that contain a particular set of words. Continue reading
State Enumeration Tool MIL-STD-756 Example
The Reliability Analytics Toolkit System States tool provides the equivalent functionality as the Method 1002 procedure described in MIL-STD-756, Reliability Modeling and Prediction. While the approach described in MIL-STD-756 is very tedious, the System States tool makes the analysis process far easier. Continue reading
Discrete Event Simulation, Example 3, Comparison to Redundancy Equation Approach
This article compares the results obtained using the Discrete Event Simulation (DES) tool to those obtained deterministically by integrating the reliability function using this tool. Continue reading
Discrete Event Simulation Tool, Example 2, Comparison to MIL-HDBK-338
In this example, we use the Discrete Event Simulation tool in the Reliability Analytics Toolkit to simulate system availability for a problem presented in MIL-HDBK-338, Reliability Design Handbook (page 10-42), as shown below. Continue reading
Discrete Event Simulation Tool, Example 1, Single Unit Failure/Repair
Discrete event simulation is a powerful technique that can be used to to solve more complex system reliability modeling problems. This article introduces the some of the capabilities of the Discrete Event Simulation tool in the Reliability Analytics Toolkit.
The Discrete Event Simulation tool can be used for:
1. Estimating system mean time between critical failure (MTBCF) for a system consisting of units with different failure and repair scenarios.
2. Estimating system operational availability (Ao).
3. Providing graphical visualizations of the overall failure and repair process for individual units, as well as a system of units operating together.
4. Estimating spare part requirements and the impact of different policies, such as local versus remote spare parts, on Ao and MTBCF.
5. Other custom user studies (by exporting the simulation results to Excel).
Estimating MTBF Based on L10 Life
The Reliability Analytics Toolkit L10 to MTBF Conversion tool provides a quick and easy way to convert a quoted L10% life to an average failure rate (or MTBF), provided that an educated guess can be made regarding a Weibull shape parameter (β). Continue reading
Service Life
Service life is a product’s expected lifetime. This period of time can be increased through corrective and preventive maintenance, or other “refresh cycles.” Service life is sometimes confused with mean time between failure (MTBF), or the life associated with a particular item in a system; however, it is primarily related to a business policy regarding whether or not a manufacturer will continued to provide support and upgrades. Continue reading