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Advanced Aerostructural Analysis for Flutter and Static Optimization in Transonic Regime

This research project led by Mr. Srinivasan Janardhan and team focuses on analyzing flutter and limit-cycle oscillation (LCO) sensitivities to structural parameters, optimizing store-induced flutter delays, and conducting vibration and static analysis using ASTROS and CAP-TSD models. The study aims to enhance aircraft design by automating analysis for various configurations, reducing computational costs, and improving certification processes. By investigating flutter conditions, damping sensitivity, and design optimization, the project seeks to advance aeroelastic analysis stability in aircraft wings with multiple store configurations.

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Advanced Aerostructural Analysis for Flutter and Static Optimization in Transonic Regime

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  1. X ASTROS O CAP-TSD (Linear) ◊ CAP-TSD (Non-Linear) Mr. Srinivasan Janardhan, Mr. Chakradhar Byreddy, Dr. Ramana V. Grandhi Dr. Philip Beran, Dr. Frank Eastep, Dr. Narendra Khot, Dr. Brian Sanders Aerodynamic Model Structural Model Research Objectives • Analyze the sensitivity of flutter speed and LCO to store structural parameters in the transonic regime • Develop a multidisciplinary optimization methodology to delay store-induced flutter Vibration and Static Analysis using ASTROS Splined Mode shapes Static Analysis using CAP-TSD Increase the number of iterations Static Solution Converging ? • Relevancy and Pay-offs • Preliminary design of airframe structures to the new and existing air vehicles • Automated analysis for multiple configurations and flight conditions • Simulation-based design approach • Facilitates “Certification by Analysis” by using higher fidelity models • Reduced computational cost and time No Use higher dynamic pressure Yes Dynamic Aeroelastic Analysis Is the Solution stable ? Yes No Flutter occurs; Determine flutter conditions , damping Sensitivity Analysis & Design Optimization Store center of gravity locations Fore Aft c.g. of underwing store @ 22 % of aerodynamic root chord c.g. of underwing store @ 44 % of aerodynamic root chord c.g. of underwing store @ 66 % of aerodynamic root chord Aerodynamic Center@ 25% of aerodynamic root chord c.g. of tip store @ 32.5 % of aerodynamic tip chord Elastic Axis @ 33% of aerodynamic root chord c.g. of tip store @ 40 % of aerodynamic tip chord c.g. of tip store @ 50 % of aerodynamic tip chord Sensitivity of Flutter and Limit-Cycle Oscillation of an Aircraft Wing with Multiple Store Configurations Research Methodology Wing/Underwing store model Wing/Tip store model • Moving the store center of gravity aft reduces the flight envelope in the transonic regime CAP-TSD model • Flutter speed increases as the • pylon length decreases • Flutter speed decreases as the store is moved along the span • LCO onset speed decreases significantly • with increase in store mass • Inclusion of store (tip and underwing) aerodynamics does not have significant influence on flutter speed

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