A laboratory experiment was conducted to quantify the annoyance response of people on the ground to en route noise generated by aircraft at cruise conditions. The en route noises were ground-level recordings of eight advanced turboprop aircraft flyovers and six conventional turbofan flyovers. The eight advanced turboprop en route noises represented the NASA Propfan Test Assessment aircraft oper...

We investigate whether there are common causes for the withdrawal from the regional aircraft market of three established manufacturers (BAE Systems, Fokker and Saab), while competitors thrived. We focus on the markets for 50and 100-seat aircraft. One cause concerning the 50-seat market was the introduction of a new class of aircraft, the regional jet, which pushed the less successful turboprop ...

Turboprop airplanes and trains have the potential in being more sustainable for short distance travels. This paper focuses on identifying factors that influence passengers selection of transport. A questionnaire was developed by 4 experts used 3 workshops with 58 aircraft interior design experts. Besides, answers 20 were incorporated as well a holistic view different stake holders. Results indi...

We investigate whether there were common causes for the withdrawal from the regional aircraft market of three established manufacturers (BAE Systems, Fokker and Saab), while competitors thrived. We focus on the markets for 50and 100-seat aircraft. One cause concerning the 50-seat market was the introduction of a new class of aircraft, the regional jet, which pushed the less successful turboprop...

The paper presents a practical and relevant analytical calculation model for free turbine turboshaft working regimes engine performance. is based on post-processing method that analyzes series of experimental data, specifically focusing the percentage variations engine’s main parameters from minimum to takeoff regime. data were acquired three different types engines: TV2-117A turboshaft, AI-20K...

Preparing and pre-testing experimental setups for flight tests is a lengthy but necessary task. One part of this preparation comparing newly available measurement technology with proven setups. In our case, we wanted to compare acoustic Micro-Electro-Mechanical Systems (MEMS) large surface-mounted condenser microphones. The task started the comparison spectra in low-speed wind tunnel environmen...

The advent of electrified propulsion systems for civil aircraft promises not only notable reductions CO 2 and NO x emissions, but also perceived noise. In an attempt to estimate the noise reduction potential fully electric engines, current study compares generated by classical turboprop turbofan engines with spectra calculated engines. calculation is based on published far-field sound pressure ...