US3830193A - Air shock wave generator for any frequency - Google Patents

Abstract

An air shock wave generator comprises a rotatable pulley which rotates at a tangential velocity at least equal to the speed of sound and which carries a part on its periphery which produces a sound frequenct equal to 40,000 X 2/d cycles per second where the diameter is in centimeters.

Description

United States Patent 1191 Sobrinho 1111 3,830,193 1451 Aug. 20, L974 1 1 AIR SHOCK WAVE GENERATOR FOR ANY FREQUENCY [76] Inventor: Leonardo Pricoli Sobrinho, Sao

Paulo City, Brazil [22] Filed: Feb. 4, 1971 [21] Appl. No.: 112,563 [30] Foreign Application Priority Data Feb. 2, 1970 Brazil ..216609 [52] US. Cl 116/137 A, 73/71.5 US, 74/61, 259/1 [51] Int. Cl 1306b 3/00 [58] Field of Search 73/67, 71.6, 147; 74/61;

[5 6] References Cited UNITED STATES PATENTS 1,705,619 3/1929 Kendall 74/61 X 2,005,917 6/1935 Linke 74/61 2,305,783 12/1942 Heymann et a1 73/7l.6 UX 2,309,172 l/l943 DeKanski 74/61 X 3,097,537 7/1963 Peterson 74/61 3,533,373 10/1970 King 116/137 A FOREIGN PATENTS OR APPLICATIONS 249,812 6/1970 U.S.S.R ll6/137 A 1,085,072 7/1960 Germany 116/137 A Primary Examiner-Louis J. Capozi Attorney, Agent, or FirmMcGlew and Tuttle [5 7] ABSTRACT An air shock wave generator comprises a rotatable pulley which rotates at a tangential velocity at least equal to the speed of sound and which carries a part on its periphery which produces a sound frequenct equal to 40,000 X 2/d cycles per second where the diameter is in centimeters.

4 Claims, 12 Drawing Figures 2i 6 W H III. 7

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d d d g I g 8 E SV(SOUND VELJ.) TV (TANGENTIAL VEL.)

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TVCTANGENTI'AL VEL.) IN RELATION TO THE LENGTH WAVE AIR SHOCK WAVE GENERATOR FOR ANY FREQUENCY BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates in general to the construction of a device for producing shock waves and in particular to a new and useful air shock wave generator for any frequency.

2. Description of the Prior Art The applicant, after long researches and experience, has been able to create an air shock wave generator for any frequency, with many applications. This invention has been made possible due to the discovery of the exact propagation way of sound.

Air shock waves are defined as being those sonic or ultrasonic waves, the amplitude of which, from the vibrating instrument that generates them, reach a minimum of 1 percent of the length of such sonic or ultrasonic waves. The air shock waves are characterized by their unidirectional property and their great power of penetration, as a result of their pent up energy, even into solid bodies.

BRIEF DESCRIPTION OF THE DRAWINGS GENERAL DESCRIPTION OF THE PREFERRED EMBODIMENTS One of the ways of putting this new invention into practice consists of the generator illustrated in the drawings (see FIGS. 1 and 2), as seen respectively in front elevation and in top view, in which a disc or pulley l is entirely made out of highly resistant light metal so constructed as to rotate swiftly and thus reach a tangential velocity equal to the velocity of sound. Anywhere on the said discs periphery, a wave generating body or part 2, e.g., fusiform, also constructed out of light metal, is firmly fastened. The disc 1 is driven by means 4 such as an electric, explosion or steam motor, directly or by means of the pulleys 3 and 5 and a belt 6 It must be stressed that the size and the motion of the body or part 2 must be at a velocity equal or greater than that of sound to obtain airv shock waves for any frequency. This is critical.

In the drawings (see FIG. 5), the frequencies are given in function of the tangential velocity (T.V.) and of the dimensions of the body or part 2 as shown in FIG. 6 of the drawings.

The frequency, when the tangential velocity is equal to that of sound, is given by the formula:

F 40,000 2/d cycles a second a being the diameter of the body or part 2 in centimeters.

EXAMPLE 1 The whole assembly as shown in FIGS. 1 and 2 generally is moved horizontally or vertically or in any other direction at an appropriate velocity to avoid a whirlpool that impairs the generation of waves, the movement velocity being about 20Kmh for a pulley or disc 1 with a diameter of cm. If the diameter of the pulley 1 is relatively large, the movement indicated to avoid a whirlpool is usually not necessary. In this embodiment of the invention a predetermined spot is hit by air shock waves according to the illustration in FIG. 7; another illustration of such waves is that of FIG. 8. The variation is experienced according to the position of the wave generating-part 2 on the periphery of the disc or pulley 1. And this occurs because when the intensity of the vibrating instrument begins to exceed 30 percent of the length of the sound wave, within certain limits, the air shock waves become unidirectional. The resultant waves are nevertheless produced without interruptions and according to a cone, more or less pointed, depending on the tangential velocity; and such waves are beveled, due to the fixation on the disc or pulley l, as illustrated according to FIGS. 9 and 10.

In FIG. 1 l, the intensity of sound is shown in function of the tangential velocity of the disc or pulley 1. It must be observed that air shock waves are an extreme case, in intensity, of the common sound waves.

In FIG. 12, the diagram of the increase of sound velocity is represented in function of the amplitude of the vibrating instrument. And thus the velocity of sound increases with the tangential velocity of the disc or pulley 1.

EXAMPLE 2 A construction variant of the wave generator according to this invention is illustrated in FIGS. 3 and 4 of the drawings, respectively in front elevation and in top view, where the motor 4, on the shaft of which the bearer or rotating member 7 of the wave generating body or part 8 is connected, and rotated and this is mounted on the support 9.

Part orbody 8, in this example, is in form or shape of a sphere which is divided into two equal parts, mounted on both sides of the rotating member or support 7, which is directly fastened on the shaft of the motor 4, and this member or support has also the form of an elongated spindle or shaft 7, instead of the pulley or disk of Example 1 and that offers less friction to air when in movement.

Also in this case, the frequency formula presents itself with its inference corrected, so that the true result is obtained:

F= 34,000 l/d',

Cycles a second where the tangential velocity is equal to that of sound, d being the diameter of wave generating body or part 8 in centimeters.

Expressed mathematically in another way, this formula may be written:

F= 17,000 X 2/d',

where F and d have the same meanings as given above.

I claim:

1. An air shock wave generator for any frequency, which comprises (1) a rotatable support member having an inner part and an outer part, (2) motive means for rotating said support member the inner part of which is operably connected thereto, said motive means being capable of rotating said member at a speed in which the member develops a tangential velocity equal to the speed of sound at any location at the outer part thereof, (3) a separate air shock wave generating body, at least part of which is streamlined with curvilinear cross-section of much smaller diameter than the distance between said inner part and said outer part and with a side wall of said body secured directly to the outer part of said support member, said wave generating body having an end portion at each end formed as a surface of revolution with a forward tip extending in respective circumferential directions, said body being of size such as to develop a frequency when rotated in accordance with the formula:

wherein F is the frequency in cycles per second, d is the diameter of said curvilinear crosssecti0n in centimeters, C is a constant value when the tangential velocity of the body is equal to that of sound.

2. Air shock wave generator according to claim 1, wherein said wave generating body is a fusiform body and C 40,000.

3. Air shock wave generator according to claim 1, wherein said wave generating body is substantially spherical and C 17,000.

4. An air shock wave generator, according to claim 1, wherein said support member is of a lightweight metal material and said wave generating body is of a lightweight metal material.

Claims (4)

1. An air shock wave generator for any frequency, which comprises (1) a rotatable support member having an inner part and an outer part, (2) motive means for rotating said support member the inner part of which is operably connected thereto, said motive means being capable of rotating said member at a speed in which the member develops a tangential velocity equal to the speed of sound at any location at the outer part thereof, (3) a separate air shock wave generating body, at least part of which is streamlined with curvilinear cross-section of much smaller diameter than the distance between said inner part and said outer part and with a side wall of said body secured directly to the outer part of said support member, said wave generating body having an end portion at each end formed as a surface of revolution with a forward tip extending in respective circumferential directions, said body being of size such as to develop a frequency when rotated in accordance with the formula: F C X 2/d wherein F is the frequency in cycles per second, d is the diameter of said curvilinear cross-section in centimeters, C is a constant value when the tangential velocity of the body is equal to that of sound.

2. Air shock wave generator according to claim 1, wherein said wave generating body is a fusiform body and C 40,000.

3. Air shock wave generator according to claim 1, wherein said wave generating body is substantially spherical and C 17,000.

4. An air shock wave generator, according to claim 1, wherein said support member is of a lightweight metal material and said wave generating body is of a lightweight metal material.

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