By order of the branch Regional Aircraft PJSC Yakovlev in the Central Aerohydrodynamic Institute named after Professor N.E. Zhukovsky, a set of aerodynamic and strength studies of the aircraft SJ-100. Thus, in the middle of June the tests of dynamically similar model of the aircraft with PD-8 engine for flutter were completed. This is one of the most dangerous phenomena in aeroelasticity, which can lead to the destruction of the aircraft’s load-bearing surfaces or its controls, TsAGI’s press service reported.
“Our main goal is to predict the occurrence of flutter in SSJ-NEW flight over the entire flight speed range. According to the results of the research, the manufacturer, based on the conclusion of TsAGI, will be able to guarantee to exclude the occurrence of negative aeroelastic phenomena on the aircraft,” said the deputy head of the department of norms of strength, loads and aeroelasticity of FAU TsAGI on the experiment – head of the laboratory Mikhail Pronin.
Scientists have studied the risks of flutter in the entire flight range of an airplane. For this purpose the behavior of the aircraft in the mode of cruising flight was simulated: at a flow speed of up to 50 m/s (when recalculated at the speed of the aircraft – up to 900 km/h) varied the rigidity of the engine linkage, control drives, wing fuel loading and commercial load in the fuselage. This made it possible to understand how flutter characteristics change with different airplane configurations.
The results of the work showed the absence of flutter in the entire range of speeds and design parameters studied, which indicates the safety of the airplane in all flight modes. The Institute’s scientists will continue to study the design of the projected SJ-100 to prevent dangerous aeroelastic phenomena. At the moment they are preparing for tests to study aeroelastic stability: the interaction between the SJ-100 elastic airframe and the control system.
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