. "Other Aviation Systems Engineering Kas"@en . . . . . . . . . . . . . . . . . . "Aircraft noise"@en . . "3.00" . "Course Contents Aircraft noise\nBasics of acoustics:\nPhysics of sound waves. Harmonic waves, sound speed, wave front and rays. Reflection, refraction and diffraction of sound\nwaves. The dB scale for acoustic power, sound intensity and sound pressure level. Interference, adding sound pressure levels and\nthe standing wave. Directionality of sound sources. Periodic and broadband noise. Doppler effect and shock waves.\nWave equation and its basic solutions:\nDerivation of the wave equation from conservation of mass, momentum and energy. Plane waves, acoustic resistance. Harmonic\nsolution to wave equation. spherical waves, characteristic acoustic impedance.\nPropagation of sound in the atmosphere:\nGeometrical spreading and sound attenuation due to friction. Sound pressure level calculations as a function of distance from the\nsource. Derivation of reflection and transmission coefficient of sound when going from one medium to another medium. Critical\nangle. Effect of temperature gradient on sound propagation. Calculation of shadow zone distance. Ray tracing. Ground effect.\nSound propagation - special situations\nSound transmission through a layer, e.g. a wall. Mass law. Propagation in enclosures, room acoustics, diffuse sound field,\nreverberation time, Sabine's law. Acoustic filters. Attenuation of sound in ducts (with changing cross-sections), e.g. exhaust\nsystems. Helmholtz resonator. Acoustic lining and its application in turbofan engines. Noise barriers.\nAcoustic signal analysis:\nFourier transform (continuous and discrete), power spectral density and spectrum level. Octave band and terts band analysis,\npressure band level. Effect on bandwidth on measured aircraft spectra. Overall sound pressure level. Spectrogram. Examples of\naircraft noise measurements, e.g. from flyovers. Properties of microphones.\nNoise metrics:\nHuman perception of sound, loudness and the phone and sone scale. Equal loudness level contours. Overall loudness level for\nbroadband noise. Equal noisiness curves, overall noy value and perceived noise level. A-weighting and overall A-weighted\nsound pressure level. Effect of the duration of sound on human perception, equivalent A-weighted sound pressure level and\nsound exposure level (SEL). Single flyover noise contours. Noise indices for total noise exposure (Lden). Noise certification.\nDutch aircraft noise model NRM.\nDirectional acoustic sources:\nMonopole, dipole and quadrupole source. Line array of monopoles. Rayleigh integral, loudspeakers.\nAcoustic imaging:\nPrinciple of beamforming. Imaging aircraft noise data.\nAircraft noise sources:\nPropeller noise (mechanism and directional properties) and blade passage frequency. Turbo engine noise and directionality of the\nfan and exhaust jet noise source. Effect of bypassing on exhaust jet noise and effect of acoustic lining on fan noise. Properties of\nairframe (aerodynamic) noise and the modelling of it (ANOPP method).\nProgramming assignment about noise contouring for an aircraft flyover.\nStudy Goals Understand the relationship between aviation and the resulting noise levels, especially around airports" . . "Presential"@en . "TRUE" . . "Master in Aerospace engineering"@en . . "Luchtvaart- en Ruimtevaarttechniek (tudelft.nl)" . "120"^^ . "Presential"@en . "In the MSc programme in Aerospace Engineering, you will have abundant opportunities for working on projects and internships across the globe, taking advantage of established relationships with Schiphol Airport, the European Space Agency, KLM, Airbus and other aerospace industries and research institutes. You will also have the option of working as a team member in international competitions in extra-curricular activities.\n\nAt TU Delft, you will obtain hands-on experience whilst working in test and laboratory facilities that are unsurpassed in Europe. Our facilities include low-speed and high-speed (up to Mach 11) wind tunnels, GPS measurement stations, the Structures and Materials Laboratory, the SIMONA research flight simulator, a Cessna Citation II flying laboratory, a collection of large and small aircraft and spacecraft parts, the Delfi Ground Station for satellite communications and a clean room for research and training on our own university satellites."@en . . . . . . . . . "2"@en . "FALSE" . . "Master"@en . "Thesis" . "2314.00" . "Euro"@en . "20560.00" . "Mandatory" . "no data"@en . "6"^^ . "TRUE" . "Upstream"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .