Flutter tests concluded for Superjet 100 successor at Moscow Institute.

Key Points:

  • The SSJ-New, following the Superjet 100, recently completed aeroelasticity testing as a precursor to its inaugural flight.

  • The Central Aerohydrodynamic Institute in Moscow held an initial round of flutter tests in June using a model of the aircraft.

  • Preliminary results indicate no flutter occurrence, but the institute plans to further scrutinize the SSJ-New's design stability.

MOSCOW — A series of critical aeroelasticity tests is in progress for Irkut's SSJ-New, the next-generation aircraft following the Superjet 100, in anticipation of its upcoming maiden voyage. The Central Aerohydrodynamic Institute in Moscow hosted the primary batch of these flutter examinations back in June, employing a detailed model of the SSJ-New. Notably, this model incorporated the Aviadvigatel PD-8 engines, distinguishing it from its predecessor, the Superjet 100.

Mikhail Pronin, the deputy head for aeroelasticity standards at the institute, emphasized the objectives behind these evaluations. "With these tests, our primary objective is to ascertain any potential flutter in the SSJ-New across its full flight speed spectrum," Pronin stated. He continued by mentioning that the insights derived from the research would assist the aircraft’s manufacturing unit in effectively eliminating any such occurrence.

The methodology of the tests was intricate. Simulations of cruise flights were conducted at speeds reaching up to 485kt. During these simulations, multiple variables such as the engine's rigidity in its attachment, actuation, changes in wing loading due to fuel, and the fuselage loads were altered. The institute elaborated, "This comprehensive approach provided clarity on the alterations in flutter characteristics based on varying aircraft setups."

The preliminary findings from the test sessions have been promising. The institute observed a complete lack of flutter throughout the tested speed ranges and configurations. However, this isn't the end of the road for the SSJ-New's examinations. Despite the encouraging results, the institute remains committed to an in-depth review of the aircraft's design stability.