Aeronautics and astronautics – Aircraft structure – Ice prevention
Patent
1990-12-20
1994-06-07
Peters, Jr., Joseph F.
Aeronautics and astronautics
Aircraft structure
Ice prevention
244134D, B64D 1516
Patent
active
053182537
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for removing deposits from the surfaces of thin-walled structures, and a device for effecting same.
PRIOR ART
The device that myself and other authors disclosed earlier for deicing thin-walled structures provides for the presence of means for generating electromagnetic field pulses and means for their installation immediately adjacent to the walls being deiced there along so that these pulses are applied to the wall and act upon it, giving rise to elastic deformations of the wall (U.S. Pat. No. 3,549,964). Thus, the point sources essentially created diverging waves of elastic deformation excited with the aid of consecutive single electromagnetic, hydraulic or pneumatic pulses.
In the device, a deflection deformation wave spreads from the point source with a drastic decline in the intensity of the effect as the distance from the source grows. Given linear cylindrical waves, the diverging wave intensity declines proportionate to the distance from a source. With nonlinear waves the intensity drops still faster as the distance from the source grows. As a result, at a distance of a mere 50 mm from the source the intensity drops by one half, therefore, it is necessary that the power of point sources be markedly increased which, in turn, may bring about hazardous residual strains in the skin. On the other hand, it is undesirable that the number of sources be increased either due to a growing weight and mechanical tension of the structural elements.
SUMMARY OF THE INVENTION
The invention is based on the discovery of a method of exciting elastic deformation which makes it possible to distribute intensity of elastic deformation uniformly and to provide a device for effecting same.
In compliance with the invention, in the method for removing deposits from the surfaces of thin-walled structures, comprising provision of elastic deformations in said walls by exciting consecutive single mechanical pulses, according to the invention, equal single pulses are excited synchronously in the opposite points along the contour encompassing the surface section being cleaned, with the result that the converging coherent waves of elastic deformation directed inwards the contour interact with one another at the section being cleaned.
This method provides for practically uniform intensity of deformation waves in the central part of the section being cleaned and a decline in intensity at the edge of the section by merely three times compared to the central part of the section, by contrast, when using the prior art method there occurs a 10-fold decline of intensity at the edge. The method of invention provides for uniform cleaning of the section surface.
It is expedient that single pulses be excited in the points arranged in a closed contour and synchronously with the said pulses single identical pulses should be generated in the center of this contour so that the occurring diverging waves of elastic deformation interact with the converging waves and are coherent therewith. This permits additional intensification of mechanical effect to be provided across the entire area of the section being cleaned, particularly along the edges thereof.
This method for removing deposits can be accomplished by using a device, comprising an electromagnetic source of mechanical pulses transmitted to said walls to generate elastic deformations therein, which, according to the invention, is furnished with a waveguide of mechanical forces of the source having opposite parts limiting the section being cleaned, arranged symmetrically to each other and communicating with the common source of mechanical pulses for synchronous excitation of single pulses in the opposite parts, with the result that the converging coherent waves of elastic deformation arise in the walls being cleaned.
The device of the invention is simple in design, convenient in assembly and service.
The waveguide of this device can be made in the form of a ring, a disk articulated with an electromagnetic source and connected to the
REFERENCES:
patent: 3549964 (1970-12-01), Levin et al.
patent: 3809341 (1974-05-01), Levin et al.
patent: 4629149 (1986-12-01), Carson et al.
patent: 4678144 (1987-07-01), Goehner et al.
patent: 4982121 (1991-01-01), Lardiere, Jr. et al.
Mattix Carla
Peters Jr. Joseph F.
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