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Electronic Systems Reliability Analysis is based on Failure Rates (FR), which is mostly predicted using physics of failures techniques. In fact, we assume that the “electronic design” is near to perfect, and that the FR is based only on the physical materials. However, based on field failures analysis, we have found that many failures actually occur due in large part to a poor design, and that this...
Hewlett-Packard Company and Shell Oil Company are developing a 1 million sensor, network capable, wireless seismic survey system, incorporating the next generation in seismic sensing technology. This mega-system will provide oil and gas companies with low frequency data, high resolution images at economics that make dense mega-channel sampling a reality.
This paper discusses the value of having a methodology and capability to de-risk the design from stress de-rating point of view and how to improve the bottom line by following and building enough margins in the design.
This paper discusseshallenges and solutions for reliability allocation analysis. The sophistication of today's designs requires a re-evaluation of reliability allocation methodologies to account for complex system designs where a single board could have lots of powerful ICs such as ASICs, FPGAs, Processors, etc. how should the overall system reliability target be divided into various elements?
Using a Royal Canadian Navy (RCN) warship project, this paper illustrates Reliability and Maintainability (R&M) challenges and how these challenges can benefit from more effective R&M management. One of the major R&M challenges discussed in this paper is that while the system uses commercial-off-the-shelf (COTS) solutions as much as possible, the goal is to create a system that operates...
The Department of Defense (DoD) has put an increased focus on reliability during system acquisition and development. This is due to historically poor reliability performance which has significantly increased sustainment costs for systems that have been built over the last 25 years. The Director of the Department of Operational Test and Evaluation has written a memorandum, dated June 30, 2010 with...
Current Army acquisition policy states that systems shall demonstrate reliability requirements with high confidence, but the policy fails to state what ‘high’ confidence means. Despite this, for every system there is an optimal confidence level with which to demonstrate the reliability requirement. The optimal confidence level may be driven by many competing factors including cost, schedule, Soldier...
This paper proposes a new modeling approach which can be applied to solve some practical reliability engineering problems when competing failure modes present, but only one or limited failures have occurred. This type of failure data cannot be modeled by traditional time-to-failure distributions. The new approach is derived from Weibayes method and provides a viable solution when reliability inference...
This paper discusses a Reliability, Availability, and Maintainability (RAM) independent assessment conducted to support the refurbishment of the Compressor Station at the NASA Langley Research Center (LaRC). The paper discusses the methodologies used by the assessment team to derive the repair by replacement (RR) strategies to improve the reliability and availability of the Compressor Station (Ref...
The accuracy of system reliability analysis depends on realistic estimation of failure parameters at the component-level. This paper models the reliability of wireless sensor nodes under three different scenarios, contributing toward reliability analysis of wireless sensor network systems. Under Scenario 1, a sensor node is kept activated and consumes constant energy throughout its lifetime. Under...
This paper outlines a method that can be used for field reliability prediction using degradation data and environmental data. From different perspectives about the effects of dynamic environment on field reliability, we proposed two methods to relate the environmental variables to degradation process. The modeling technique and estimation method are illustrated by an example to predict the field failure...
This paper considers the reliability analysis of phased-mission systems (PMS) subject to competing failure propagation and failure isolation effects. A propagated failure with global effect (PFGE) originating from a system component is a failure that causes damage to all other system components besides the component itself. However, in systems subject to the functional dependence (FDEP) behavior,...
This paper presents a case study depicting the use of a number of Reliability Tools following the: Define, Measure, Analyze, Improve, and Control (DMAIC) process to attain gains. A Failure Reporting Analysis and Corrective Action System (FRACAS) database is used to identify (hardware failure / program money) problems. A well-defined FRACAS database with a solidly defined root cause classification...
Generally, products especially aviation products must satisfy rigorous demand on the performance sensitivity caused by uncertainty disturbance. As long as performance indexes overstep the specified range, the temporal failure would happen. Otherwise, long time degeneration becomes increasingly obvious with usage and further intensifies performance sensitivity. So performance reliability gradually...
High demanded reliable components or systems projects necessitate reliability prediction in early design and development phase. Historically reliability predictions are performed using standardization of the technique such as MIL-HDBK-217 or similar handbook, which in many cases has produced inaccurate reliability results. Today's complex designs, which have intricate interfaces and boundaries, cannot...
When systems possess components with wearout failure characteristics or non-constant hazard rates and in standby redundancy configurations, the most common method currently utilized in industry for handling the reliability predictions of such systems is based on Monte Carlo Simulations. Monte Carlo Simulations are relatively easy to develop, but accuracy of the approximations that are produced dependents...
The way we communicate goals directly impacts the achievement of the goal. Creating and succinctly stating a reliability goal necessary for the leadership it provides an organization when designing a new product.
Reliability and safety analysis are important for any company, regardless of industry. Reliability analyses give an estimate of how often a product is likely to fail and a list of its most unreliable components. Safety analyses help to decrease the risk that a product will cause undesired consequences in the field. Companies across many industries use the same tools for reliability and safety analyses,...
This paper presents a new approach, referred to as the nested extreme response surface (NERS), to efficiently carry out time-dependent reliability analysis and determine the optimal designs. The key of the NERS is to convert the time-dependent reliability analysis to time-independent one through constructing a kriging based nested time prediction model. The efficient global optimization technique...
Alion's System Reliability Center (SRC) has developed a systematic approach for independently assessing all aspects of the product's life cycle to determine whether proven reliability and maintainability (R&M) activities are being utilized within an organization. Alion SRC's Reliability Maturity Assessment benefits from lessons learned in a wide range of industries to objectively identify strengths...
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