Download or read book Multidisciplinary Optimization and Sensitivity Analysis of Flutter of an Aircraft Wing with Underwing Store in Transonic Regime written by Chakradahr Byreddy and published by . This book was released on 2003 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Mechanics Approach for Multidisciplinary Nonlinear Sensitivity Analysis written by Ramana V. Grandhi and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Mechanics Approach for Multidisciplinary Nonlinear Sensitivity Analysis written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this research work was to develop preliminary designs of aircraft wing/store configurations to achieve improved flutter performance in the transonic regime. In this research work, a methodology was developed to incorporate the nonlinearities associated with the wing and store in transonic regime into the multidisciplinary environment. Investigated the aeroelastic effects of the wing with and without the inclusion of store aerodynamics. The tip store configurations and underwing store configurations were analyzed independently. The results indicated that the inclusion of tip and underwing store aerodynamics does not have any significant impact on the flutter velocity in the transonic regime for these wing/store configurations. Mathematical optimization techniques were used for redesigning the wing structure. The research work addressed the need for higher fidelity aerodynamic analysis in preliminary design stages of aircraft design. Particularly, these findings are useful for store certification.
Download or read book Multidisciplinary Design Optimization of an Aircraft Wing tip Store in the Transonic Regime written by Srinivasan Janardhan and published by . This book was released on 2003 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Structural and Aerodynamic Modeling on Flutter Analysis and Structural Optimization written by Alfred G. Struz and published by . This book was released on 1991 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The influences of structural and aerodynamic modeling on the flutter analysis and multidisciplinary optimization of fully built-up finite element wing models in an aeroelastic environment are not yet well understood. Therefore, the dynamic aeroelastic and optimization capabilities in the Automated Structural Optimization System (ASTROS) were used to evalute the flutter behavior and the behavior of structural optimization with flutter constraints of various representative fully built-up finite element wing models in subsonic and supersonic flow. ASTROS was here used as a tool to calculate flutter speeds and frequencies and to minimize the weight of these wing models n subsonic and supersonic flow under given flutter and frequency constraints to determine the effect that these modeling factors have."--Report documentation page.
Download or read book Parametric Studies of Transonic Flutter and Limit Cycle Oscillation of an Aircraft Wing Tip Store written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigates the effect of store parameters variation on store-induced flutter and limit-cycle oscillation phenomena of an aircraft wing in the transonic regime. The primary store parameters are its mass and the chord wise location of its center of gravity. The effect of including store aerodynamics on the wing/tip store configuration is also investigated. These studies are being conducted to understand the behavior of store-induced flutter and limit-cycle oscillation in the nonlinear region so as to limit the number of flutter flight tests to a few critical ones and enable in future store certification efforts. The tip store center of gravity (c.g.) has been varied and positioned at three different locations: 32.5%, 40%, and 50%, with respect to aerodynamic tip chord. Automated Structural Optimization System and Computational Aeroelasticity Program - Transonic Small Disturbance (CAP-TSD) have been used in the linear and nonlinear region to perform this research. Studies show that flutter speed increases as the store c.g. was moved forward towards the leading edge. This gives an indication that store c.g. must be placed as far forward as possible with respect to the elastic axis to delay the occurrence of flutter, while satisfying other design constraints. It was observed that the increase in tip store mass significantly reduced the flight operating speed range of the aircraft. The effect of inclusion of store aerodynamics for different wing/store configurations was found to be insignificant compared to their corresponding mass-only models in the transonic regime. LCO onset speed was found to be sensitive to store mass and varied significantly for different store mass configurations.
Download or read book Nonlinear Transonic Flutter Prediction for F 16 Stores Configuration Clearance written by Raymond G. Toth and published by . This book was released on 2003-03-01 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Limit cycle oscillation (LCO) has been an issue for the F-16 since its operational deployment. Configuration validation requires large investments in time and resources due to the very specific and stringent guidelines used during flight test to ensure the aircraft does not encounter classical flutter or excessive LCO. A new approach, incorporating inherent nonlinearities that drive LCO is investigated using the Transonic Equivalent Strip method to account for wing thickness effects and shock structure. The g-method flutter solution is used to include first-order aerodynamic damping effects. Two F-16 store configurations are examined to correlate predicted flutter onset speeds, frequencies, and character with those found in flight test, as well as the aerodynamic effect of modeling underwing stores on the flutter solution. Results show small changes in the tuning of the structural model resulted in large changes in the flutter boundary. The aerodynamic influence of underwing stores proved significant, particularly for the two most outboard wing stations. Most importantly, the character of the instability was predicted by the new method.
Download or read book Effects of Winglet on Transonic Flutter Characteristics of a Cantilevered Twin engine transport Wing Model written by Charles L. Ruhlin and published by . This book was released on 1986 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Wing Flutter at Transonic Speeds for Six Systematically Varied Wing Plan Forms written by George W. Jones and published by . This book was released on 1953 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wing Flutter Calculations with the CAP TSD Unsteady Transonic Small Disturbance Program written by and published by . This book was released on 1988 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multidisciplinary Sensitivity Analysis and Design Optimization of Flexible Wings Using the Euler Equations on Unstructured Grids written by Arunkumar Satyanarayana and published by . This book was released on 1999 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Passive Control of Wing store Flutter written by and published by . This book was released on 1980 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shape Sensitivity Analysis of Flutter Response of a Laminated Wing written by Frederick D'Oench Jr Bergen and published by . This book was released on 1988 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Structural and Aerodynamic Modeling on Flutter Analysis and Structural Optimization written by Alfred G. Struz and published by . This book was released on 1991 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The influences of structural and aerodynamic modeling on the flutter analysis and multidisciplinary optimization of fully built-up finite element wing models in an aeroelastic environment are not yet well understood. Therefore, the dynamic aeroelastic and optimization capabilities in the Automated Structural Optimization System (ASTROS) were used to evalute the flutter behavior and the behavior of structural optimization with flutter constraints of various representative fully built-up finite element wing models in subsonic and supersonic flow. ASTROS was here used as a tool to calculate flutter speeds and frequencies and to minimize the weight of these wing models n subsonic and supersonic flow under given flutter and frequency constraints to determine the effect that these modeling factors have."--Rept. doc. p.
Download or read book Multidisciplinary Optimization of a Transport Aircraft Wing written by Will J. Lee and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adaptive Control of Wing store Flutter written by C. A. Harvey and published by . This book was released on 1979 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flutter Characteristics of Swept Wings at Transonic Speeds written by Laurence K. Loftin and published by . This book was released on 1955 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
