Radiated Noise from an Externally Blown Flap
نویسنده
چکیده
منابع مشابه
The Cost of Noise Reduction for Powered - Lift Stol
The direct operating costs and noise impacts of a wide variety of Externally Blown Flap and Augmentor Wing STOL short haul transport aircraft designs were evaluated to study the costs of noise reduction for these types of aircraft. The "two-stream" Augmentor Wing designs were found to be capable of the greatest noise reductions, and to have the lowest direct operating costs at all levels of noi...
متن کامل(nasa-tm-x-71502) Rational Function N74-16714 Representation of Flap Noise Spectra including Correction for Reflection
A rational function is presented for the acoustic spectra generated by deflection of engine exhaust jets for under-the-wing and over-thewing versions of externally blown flaps. The functional representation is intended to provide a means for compact storage of data and for data analysis. The expressions are based on Fourier transform functions for the Strouhal normalized pressure spectral densi...
متن کاملThe Aerodynamic Noise of a Slot in an Aerofoil
SUMMARY This Report describes a theoretical investigation of the noise generated when turbulence interacts with a slot between a wing and flap. The slot is modelled by the region between two overlapping, semi-infinite rigid planes representing the wing and flap, and sound is produced when turbulence convects above, below or through the slot. The analysis determines the dependence of the radiate...
متن کاملAnalysis and measurement of timing jitter induced by radiated EMI noise in automatic test equipment
This paper deals with the generation, measurement and modeling of the jitter encountered in the signals of a testhead board for automatic test equipment (ATE). A novel model is proposed for the jitter; this model takes into account the radiated electromagnetic interference (EMI) noise in the head of an ATE. The RMS value of the jitter is measured at the output signal of the testhead board to va...
متن کاملNumerical and Analytical Investigation in Radiated Noise by a Shock-Absorber
In this article, the radiated noise by a shock-absorber is studied. This particular shock-absorber is used in a heavy-gauge shearing line in order to stop the cut steel sheets. Three steps are followed to evaluate the propagated sound in the surroundings; first of all, the plate vibration response is specified after the impact. Secondly, the edges of the plate are substituted by a set of the mo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2002