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Time-varying structural reliability of launch vehicle via extreme response approach

Raouf, N ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.2514/1.A33550
  3. Publisher: American Institute of Aeronautics and Astronautics Inc , 2017
  4. Abstract:
  5. Time-varying structural reliability of a multistage solid-propellant launch vehicle subjected to deterministic and stochastic loads is investigated. The study is of practical importance because the launch vehicle's structure is influenced by a combination of external aerodynamics as well as inertial and internal ballistic loads emanating from the solid rocket motors. In addition, as launch-vehicle flight conditions change during flight, the vehicle will be subjected to time-varying loads. In this sense, the environmental, aerodynamic, and internal pressure fluctuations can be interpreted as stochastic forces affecting the launch-vehicle structural reliability. To account for temporal variations of the total loads experienced by the launch vehicle, its time-dependent structural reliability is formulated via a stress limit state function. The first-order reliability method is used to estimate the launch-vehicle cumulative failure probability as a function of flight time. The results are verified using the method of direct Monte Carlo simulation. Finally, a sensitivity of launchvehicle structural reliability is performed against some statistical variations related to solid rocket motor and launchvehicle design parameters that dominantly affect time-varying structural reliability. © 2016 by The Aerospace Corporation
  6. Keywords:
  7. Aerodynamics ; Intelligent systems ; Launch vehicles ; Monte Carlo methods ; Reliability ; Rocket engines ; Sensitivity analysis ; Solid propellants ; Stochastic systems ; Structural analysis ; Vehicles ; Direct monte carlo simulations ; External aerodynamics ; First order reliability methods ; Practical importance ; Pressure fluctuation ; Solid rocket motors ; Statistical variations ; Structural reliability ; Rockets
  8. Source: Journal of Spacecraft and Rockets ; Volume 54, Issue 1 , 2017 , Pages 306-314 ; 00224650 (ISSN)
  9. URL: https://arc.aiaa.org/doi/10.2514/1.A33550