Results 61 to 70 of about 111,602 (208)

Comparison of predicted engine core noise with current and proposed aircraft noise certification requirements [PDF]

Predicted engine core noise levels are compared with measured total aircraft noise levels and with current and proposed federal noise certification requirements. Comparisons are made at the FAR-36 measuring stations and include consideration of both full-
Groesbeck, D. E., Vonglahn, U. H.
core   +1 more source

ANALYSIS OF APPLICATION METHODS OF THE TONALITY AMENDMENT DURING GAS-TURBINE ENGINES DEVELOPMENT TESTS FOR CORRESPONDENCE WITH NOISE ENVIRONMENTAL REQUIREMENTS

Авіаційно-космічна техніка та технологія, 2018
The important and actual task of the modern engine engineering is an objective estimation of gas-turbine engine noise levels during its development tests, which will allows to estimate the expected noise levels as part of aircraft.
Владимир Николаевич Журавлёв, Татьяна Владимировна Критская   +1 more
doaj   +1 more source

Certification of unbounded randomness with arbitrary noise

Physical Review A
Close to published ...
openaire   +2 more sources

Recent Langley helicopter acoustics contributions [PDF]

The helicopter acoustics program at NASA Langley has included technology for elements of noise control ranging from sources of noise to receivers of noise. The scope of Langley contributions for about the last decade is discussed.
Morgan, Homer G., Pao, S. P., Powell, C. A.   +2 more
core   +1 more source

Mixed-state certification of quantum capacities for noisy communication channels

, 2017
We extend a recent method to detect lower bounds to the quantum capacity of quantum communication channels by considering realistic scenarios with general input probe states and arbitrary detection procedures at the output. Realistic certification relies
Macchiavello, Chiara, Sacchi, Massimiliano F.   +1 more
core   +1 more source

Regulatory Challenges in International Aviation: Indonesia and Russia Compared

Pattimura Legal Journal
Introduction: The global aviation industry operates within a complex web of international regulatory frameworks that vary significantly from one country to another. This study focuses on the interplay between these frameworks, particularly examining the
Gevan Naufal Wala, Lazarev Viktor Antonovich   +1 more
doaj   +1 more source

Numerical Assessment of Electromagnetic Radiated Emissions from an UWB Radiators Located Inside Metallic Enclosures with Small Air-Flow Openings

The Journal of Engineering Research, 2018
Shielding effectiveness of electronic devices and computing devices is  essential at design stages. Devices should pass electromagnetic interference/compatibility tests for certification purposes.
Mohammed M Bait-Suwailm, Boudelliou A Boudelliou, Naser Al-Tarhuni   +2 more
doaj   +1 more source

Assessment of Airframe Noise Reduction Technologies Based on EPNL from Flight Tests [PDF]

The acoustic performance of various airframe noise reduction technologies Adaptive Compliant Trailing Edge flap, main landing gear fairings, and gear cavity treatments was determined, individually and in combination, using the Effective Perceived Noise
Khorrami, Mehdi R., Ravetta, Patricio A., Van De Ven, Thomas, Wisda, David M.   +3 more
core   +1 more source

Human response to aircraft noise [PDF]

, 1991
The human auditory system and the perception of sound are discussed. The major concentration is on the annnoyance response and methods for relating the physical characteristics of sound to those psychosociological attributes associated with human ...
Fields, James M., Powell, Clemans A.
core   +1 more source

A Quiet Helicopter for Air Taxi Operations [PDF]

NASA is exploring rotorcraft designs for VTOL air taxi operations, also known as urban air mobility (UAM) or on-demand mobility (ODM) applications. Several concept vehicles have been developed, intended to focus and guide NASA research activities in ...
Johnson, Wayne
core   +1 more source