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Research activities

Research activities. E. Nikolaidis B. Ramaswamy B. Dheenadayalan A. Keerti S. Mathew P. Soundappan D. Tiwary Vibration and Reliability Lab Friday, April 20, 2001. Overview. 1.Design under uncertainty. 3. Knowledge-based design tools. 2. Structural dynamics.

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Research activities

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  1. Research activities E. Nikolaidis B. Ramaswamy B. Dheenadayalan A. Keerti S. Mathew P. Soundappan D. Tiwary Vibration and Reliability Lab Friday, April 20, 2001

  2. Overview 1.Design under uncertainty 3. Knowledge-based design tools 2. Structural dynamics

  3. Design under uncertainty Design concept 1 Noise level (db) Design concept 2 Design concept 3 Cost ($)

  4. Profit is uncertain and depends on selection of design concept Probability density of profit Profit ($) Loss 0 Which design is better ?

  5. Goals • Study and understand advantages and limitations of methods for modeling uncertainty (classical probability, Bayesian probability, fuzzy sets, imprecise probabilities) • Study methods for modeling a decision-maker’s preferences and attitude toward risk • Address issues of lack of data and high computational cost • Develop tools for making design decisions under uncertainty by combining the above methods

  6. 2. Structural Dynamics; Modeling and suppressing internal resonances in vibration isolators Front of the car

  7. Transmissibility of real isolator System resonance, n Transmissibility Isolator Resonances Actual 1 Ideal 1 w/wn

  8. Using DVA’s to suppress internal resonances

  9. Knowledge-based design tools; considering details upfront in design Global Vehicle Model Global design variables Global Optimizer Load and stiffness requirements for components Optimal safety factor of components Local models

  10. Traditional design optimization versus local/global optimization infeasible feasible 100 84 85

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