System Analysis Tools
Convert Maintenance Event Logs to Failure and Repair Data
Weibull++ provides a specialized folio designed specifically to capture system failure and repair data in an event log format like those commonly used in the machine tools and other industries. If you have a log that records the date/time when a system downing event occurred and the date/time when the system was restored to operation, the software converts this information to time-to-failure and time-to-repair data that can be analyzed with life data analysis techniques. Some useful options in this folio include the ability to:
- Define the shift pattern that describes the time periods when the systems are operating each day.
- Analyze data for a single system or multiple systems simultaneously.
- Categorize events as "failures" or "events," and then specify whether non-failure events will be considered in the life data analysis.
- Specify which component/assembly is responsible for each event, and then perform the analysis for any level of the system configuration.
Recurrent Event Data Analysis (RDA) for Repairable Systems
The failure behavior of repairable systems is dependent on the history of repairs, and therefore traditional life data analysis methods (which treat failure data as independent and identically distributed) are usually not applicable. To provide the appropriate analysis treatment for such data, Weibull++ offers two analysis folios that can be used to analyze recurrent event data from repairable systems.
- The Non-Parametric RDA folio uses the well-known Mean Cumulative Function (MCF) to plot the average number of recurring failures over a given period of time. The plot can be used to evaluate whether the number of failures is increasing or decreasing over time, to predict the future number of failures and to compare data sets from different designs, operating conditions or production periods.
- The Parametric RDA folio uses the General Renewal Process (GRP) model, which takes into account the effectiveness of repairs on the condition of the system and models the cumulative number of failures over time. You can use the analysis to generate a variety of plots and calculated results, including the number of failures, failure intensity, mean time between failures (MTBF) and conditional reliability.
Reliability Block Diagrams (RBDs)for Complex Failure Modes Analysis
A simple Competing Failure Modes (CFM) analysis can be performed directly within the Weibull++ standard folio by assuming a series reliability model and using only one type of distribution to analyze all the modes. When a more complex analysis is required, you can use the Diagrams feature that is directly integrated into Weibull++ and ALTA projects. The blocks in the diagram are linked directly to analyzed standard folios and you can use the RBD for situations when:
- the analysis involves more than four failure modes.
- different failure modes should be analyzed with different life distributions.
- the relationship between the failure modes is not a simple series configuration.
Maintenance Planning Tool
The ability to calculate the optimum replacement time provides a powerful opportunity to reduce a system's maintenance costs while maximizing uptime. The new Maintenance Planning Tool generates a cost vs. time plot designed to help you determine the most cost-effective time to replace a system’s worn or failed components. The tool also offers an option to create preventive and/or inspection tasks for use in BlockSim simulation diagrams.