Elham Keshavarzi

Oregon State University | OSU · School of Mechanical, Industrial and Manufacturing Engineering

There are many uncertainties that complex engineered systems will face throughout their lifecycles due to changes in internal and external conditions. It is desirable for complex engineered systems to be resilient against various uncertainties. The ability to overcome such uncertainties should be embedded into the system from the beginning. However...

It is desirable for complex engineered systems to be resilient to various sources of uncertainty throughout their life cycle. Such systems are high in cost and complexity, and often incorporate highly sophisticated materials, components, design, and other technologies. There are many uncertainties such systems will face throughout their life cycles...

Most engineered systems have to exhibit a high degree of reliability and robustness. They are high in cost and complexity and often incorporate highly sophisticated materials, components, design and other technologies. Therefore, they face uncertainties in categories ranging from technical issues to market changes. This includes a wide range of epi...

This paper presents a framework to compare the resiliency of different designs during the conceptual design, when information about implementation details is unavailable. We apply the Inherent Behavioral Functional Model (IBFM) tool to develop an initial functional model for a system and simulate the failure behavior. The simulated failure scenario...

This paper represents a step toward a more complete frame-work of safety analysis early in the design process, specifically during functional modeling. This would be especially useful when designing in a new domain, where many functions have yet to be solved, or for a problem where the functional architecture space is large. In order to effectively...

As a system becomes more complex, the uncertainty in the operating conditions increases. In such a system, implementing a precise failure analysis in early design stage is vital. However, there is a lack of applicable methodology that shows how to implement failure analysis in the early design phase to achieve a robust design. The main purpose of t...

In design process of a complex engineered system, studying the behavior of the system prior to manufacturing plays a key role to reduce cost of design and enhance the efficiency of the system during its lifecycle. To study the behavior of the system in the early design phase, it is required to model the characterization of the system and simulate t...

My Ph.D. defense presentation

Current model validation methods are based on availability of another valid model or historical data or real system, however in early design phase there is very little or no information of the real system. I proposed ideas based on non-parametric statistical technique and sensitivity analysis to provide the designers the ability to validate the sim...

We proposed a new design framework to apply resiliency techniques into the system from the beginning in early design stage. The first step is to develop an initial functional model in early design stage and simulate the failure behavior of the system. The unique scenarios provide the information on the final behavior of the system assigned to each...

proposed ideas to design complex engineered systems able to cope with internal (aleatory) and external (epistemic) uncertainties.

Dynamic Design for Complex Engineered Systems

In a traditional design approach, a pre-defined set of requirements based on market studies or user needs is established, and then the optimal design is selected to satisfy the requirements. The traditional approach is inadequate to respond to unexpected changes in initial requirements or operating conditions. To resolve this issue, we proposed a n...

Space systems are high in cost and uncertainty. This presentation reviews the flexibility techniques applied into design of space systems.