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...

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...

Abstract The pilot project of new light civil turboprop aircraft, called the KhAI-90, featuring a cruising speed 350km/h, payload 600 kg at 500 km range, and equipped with two Rolls-Royce 250-B17F engines each power 420 hp (alternatively, AI-450C 450 may be installed) is presented herein. Based on developed technical task, concept for creating KhAI-90 competitive analysis prototypes’ aircraft p...

i i t h component n number o f components t t r a n s m i s s i o n 10 90 pe rcen t r e l i a b i l i t y S u p e r s c r i p t s : e We ibu l l s l ope p l o a d l i f e f a c t o r I n t r o d u c t i o n One i m p o r t a n t measure o f t h e per fo rmance o f t u rboprop t r a n s m i s s i o n s i s t h e s e r v i c e t ime between scheduled maintenance o v e r h a u l s . I n t h e des ...