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Flutter phenomenon (Aeroelasticity phenomenon) is the main source of instability in supersonic Aerospace-Craft (SAC) that is subjected to aerodynamic forces. The coupling of bending and torsional vibration of the flexible bodies is the major reasons of instability. Every SAC under the influence of aerodynamic forces has specific type of forces that can change its properties and structure constants such as natural frequencies, and then the SAC is faced with strong instabilities that cannot be prevented even by increasing the reliability of the design. In the SAC we directly involve in the aerodynamic and relativity physics. Modern SACs make aerorelativistic study an important aspect of mechanics. This appears when the ASCs are subjected to aeroelastic forces at the ultra-high speed. Aerorelativistic effects based on the Lorentz invariant equations the time dilation for flutter was determined in our study. In theoretical method the flutter velocity and natural frequency of the system was determined, and flutter speed related to the coupling of bending, and torsion were defined. We exactly determined that flutter involves with aerodynamic-elastic and velocity at the ultra-high limit. Equations were shown that some critical speed that known as the flutter speed, could be predicated by an observer in the initial frame reference. Therefore, the body displacement against the flow field plays a fundamental role in dynamic solidity analysis. "In order to maintain the supersonic object stability in ultra-high speed, predication's time in the occurring flutter can be determined in the relativistic limit" Jahanshir said. Therefore, the main focus on this type of study is to merge relativistic equation of motion in mechanical engineering science and determination of predication flutter's moment.
Dr Arezu Jahanshir, Assistant Professor & Faculty Member of BZT University, Iran.
A paper about the study appeared in aerospace sciences.