Accordingly, procedures for measuring aircraft noise levels have been developed. There are international standards that specify how transport noise (aircraft, traffic and railroad) must be measured. ISO 1996-2 standard has an appendix called Annex B which specifies the reference position of the ...
For aircraft operations, the Day/Night average sound level (Ldn) descriptor is typically used to categorize noise levels. [Source: 14 CFR 150] NoiseIncident A formal complaint by an individual or group regarding excessive noise resulting from airport operations. NoiseMonitoringPoint The location ...
Calculated engine core noise levels, based on NASA‐Lewis prediction procedures, for five representative helicopter engines are compared with measured total helicopter noise levels and proposed FAA helicopter noise certification requirements. Comparisons are made for approach, level flyover, and takeoff proce...
FAA. External noise certification was part of the process for the joint EASA and FAA type certification for the GP7200.rnThe noise levels certified on ... JL Broge - 《Aerospace Engineering & Manufacturing》 被引量: 0发表: 2008年
FAA releases study on aircraft noiseNancy Perkins Deseret Morning News
Propeller noiseAircraft noiseExperimental designWind tunnel testsEngine nacellesAir pressureData processingBand spectraIn this Appendix the test results on the effect of propeller disc plane attitude (Propeller 1: Thickness 6.4%, round tip-shape) are documented in terms of pressure time histories, ...
So how do you sift through all the noise and write a public comment that could actually make an impact? Read on for our four major points to consider when writing your public comment. Need More Information? Feel like you need to learn more about the Remote ID proposal and the NPRM proces...
Making your world a quieter place. Making your world a quieter place. We specialise in noise and vibration isolation solutions for buildings and industrial equipment. Whatever type of building you have and whatever type of noise and vibration problem you have we can design a solution for you. ...
A JT8D engine was modified to reduce jet noise levels by 6-8 PNdB at takeoff power without increasing fan generated noise levels. Designated the JT8D-109, the modified engines featured a larger single stage fan, and acoustic treatment in... EA Burdsall,FP Brochu,VM Scaramella 被引量: 8发...
The company has been acknowledged at all levels and titled as Zhejiang Outstanding Foreign Trade Export Enterprise, China Export Quality and Safety Demonstration Enterprise, National Key High-tech Enterprise, Zhejiang Patent Demonstration Enterprise, Zhejiang Province Science...