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Radiation induced failure and degradation modes depend critically on the application as well as the component technology, so it is essential that radiation, component, design, and system engineers work together, preferably starting early in a program, to ensure critical applications are addressed in time to maximize the probability of mission success. Reliability engineers should work with the radiation...
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...
We can say that the traditional practices for performing a criticality analysis are insufficient. The author seeks to develop a method that is repeatable and informative for criticality analyses. Using Moubray's P-F interval and Hidden/Evident criteria, there are advantages over the traditional Modal Criticality Number and Risk Priority Number. The practicing engineer can get a better understanding...
For many engineering companies, a substantial proportion of the finished product consists of components produced by suppliers. Any effective reliability program must therefore include a means of assuring supplier reliability. The purpose of this paper is to provide attendees “lessons-learned” that made the difference in ensuring the supplier's reliability program was defined based upon the integrated...
The paper emphasizes prognostics that are derived from data currently available within or from electronic components, thus avoiding the need for additional sensors and extensive physical modification of systems and permitting immediate savings to be realized. Areas where this approach is particularly suitable include Semiconductor memories Data communications Initialization procedures Feedback control...
Communicating the likelihood and consequence of potential risks is critical in today's business environment. A comparison of the likelihood of several different potential events can provide insight to management about factors that, if left unchecked, may cause an unwanted scenario. One method utilized to calculate the likelihood of a risk being realized is the “One-out-of-X” measure. This high-level...
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.
Using a Triage identification process similar to a battlefield medical triage to uncover major program schedule risks early is a combination of traditional Risk and Opportunity management and advanced Monte Carlo Schedule Risk Analysis (SRA). The triage process uses three techniques of increasing fidelity. The approach is a cost effective application of SRA which analyzes only the most egregious critical...
This paper addresses the problem of estimating the reliability of a critical system function as well as its impact on the system reliability when limited information is available. The approach addresses the basic function reliability, and then the impact of multiple attempts to accomplish the function. The dependence of subsequent attempts on prior failure to accomplish the function is also addressed...
Risk assessment is one of the primary tools that management teams use to determine if a product should be taken to market. If the risk associated with the product concept is at an acceptable level, the product proceeds into the design phase. Throughout the product lifecycle, the risk assessment is updated and refined as product functions are built out into the design. Different industries use different...
Statistically demonstrating reliability does cost. It requires specimens, test resources, and personnel. Effectively choosing which failure modes need statistical demonstration to the product reliability specification can lead to increased product reliability. This is done by moving resources from unnecessary verification work to product improvement work.
A Chi-Squared Accelerated Reliability Growth (CARG) model has been developed as a new method for single- and multi-stress level reliability growth life data analysis. The model is relatively easy to apply and is very practical. The CARG method is appropriate when an exponential distribution can be assumed. The chi-squared distribution has been used as a traditional method of identifying reliability...
Aircrafts has performed Three Level Maintenance for a long time, and exposed many problems, such as maintenance system couldn't fit the aircraft self's technologies and logistical support demands, and led to the increasing of support costs. Based on it, we research the parts of key technologies on the Two Level Maintenance for modern aircraft, including support process model, simulation calculation...
In the past two decades the necessity for improved data collection methods in the power generation industry has become increasingly important. With a growing number of new and varied technologies becoming available to the customer, it is essential that OEM's (Original Equipment Manufacturer) have a detailed knowledge of how their products are performing in relation to the rest of the market. The ability...
Safety and Effectiveness of the product is crucial part of medical devices as it deals with human lives. In the case of medical device software it is important to establish processes, activities and tasks which assure that the software has been developed in a manner that is likely to produce highly reliable and safe products. It is proven that most of the software failures are design failures and...
To support development of more reliable software, AMSAA has developed a software reliability scorecard offered free of charge to department of defense employees and their contractors. The scorecard methodology provides a structured and transparent approach to assess and improve software reliability practices. AMSAA's new software reliability scorecard assesses seven key areas of software development...
The availability estimation of photovoltaic (PV) systems has not been received great attention in the literature. Availability is important consideration in the life-cycle of such systems. This paper presents a methodology for estimating the availability of a photovoltaic system using Petri networks. Each component - module, wires and inverter - is detailed in Petri networks. In this paper, we simulate...
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.
The objective of this paper on Software Reliability (SWR) is to provide a practical approach to implementing a SWR program for Army software intensive system acquisition planning and subsequent software development activities. The goal of this paper will be to leave the reader with the understanding that there is no magic to implement a robust SWR strategy and also to show that there is an abundance...
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