This paper deals with the experimental assessment of aerodynamic characteristics an innovative large turboprop aircraft. The configuration is a three-lifting surfaces airplane rear engine installation at tail tips, conceived to carry up 130 passengers and targeting minimum economic environmental impact, which competitive regional jets on short medium hauls. layout output previous research made ...

In this paper multi-objective genetic algorithms were employed for Pareto approach optimization of turboprop engines. The considered objective functions are used to maximize the specific thrust, propulsive efficiency, thermal efficiency, propeller efficiency and minimize the thrust specific fuel consumption. These objectives are usually conflicting with each other. The design variables consist ...

In this paper, a modified cost function is proposed in order to achieve themaximumnoise attenuation using a set of secondary sources for a harmonically excited sound field. The modified cost function drives the error signal to the optimally attenuated sound field instead of minimizing the squared pressure. Moreover, changing the value to which the error signals must be driven allows change of t...

The study of aircraft noise started in earnest in the 1960s, however, the validation of comprehensive noise models for existing commercial aircraft using well-defined experimental data have since produced modest advances. Considerable focus appears to have been placed on aircraft conceptual design, with relatively little effort considering aircraft currently in use, for which we believe there i...

Vibration-acoustic diagnostics of rotary machine defects is the most effective method for non-destructive testing their technical condition. Practice shows that its successful use largely depends on a set available methods analyzing vibration processes. Gears are common and heavy-duty components determine overall vibratory condition machine. There quite variety vibration-based gear defects. The...

This paper deals with evaluation and analysis of carbon footprint an airline operator, Nepal Airlines Corporation (NAC) by using its actual flight maintenance data from 2016 to 2019. NAC is a multi-fleet both turboprop turbofan aircrafts. Carbon in terms Dioxide (CO2) emission has been calculated for NAC’s operations per individual aircraft, fleet-type operating sector (i.e., international dome...