US3855487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration generator for studying structures
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1973-02-12
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Granted: 1974-12-17
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Expires: 1993-02-12
Abstract
Abstract The invention relates to a vibration generator for studying the behaviour of structures, particularly aircraft wings, its application being especially advantageous when said structure is subjected at the same time to the action of a generator and the effect of outside stresses of a variable, undetermined or irregular nature. The vibration generator is so designed that the transmission of the effects of outside stresses to the inert mass is attenuated with respect to the transmission of the generating forces set up by the motor means of the generator. The generator motor means comprise a unit alternately rotating in both directions, rotation movement being converted into rectilinear movement by means of a mechanical torque device.
Inventors
- 👤 J Boisseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:33
CPC Classifications
G; G01; G01M; G01M5/00; G01M5/0066; G01M5/0016; G01M5/0041; G01M5/005; G01M7/00; G01M7/02; G01M7/04; H; H02; H02K; H02K7/00; H02K7/06; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
96 words
A vibration generator for attachment to a structure to be studied comprising: a frame element having means for attachment to said structure, a weighted mass mounted for rectilinear reciprocation upon said frame element, rotary motor means capable of rotation in either of two opposite rotational directions having a motion output shaft carried by said frame element, and means interconnecting said motion output shaft and said mass whereby rotational motion of said motor is converted to linear motion of said mass, and cyclic operation of said motor results in the impartation of a vibration to said frame.
Claim 2
Dependent Claim
96 words
A vibration generator for attachment to a structure to be studied comprising: a frame element having means for attachment to said structure, a weighted mass mounted for rectilinear reciprocation upon said frame element, rotary motor means capable of rotation in either of two opposite rotational directions having a motion output shaft carried by said frame element, and means interconnecting said motion output shaft and said mass whereby rotational motion of said motor is converted to linear motion of said mass, and cyclic operation of said motor results in the impartation of a vibration to said frame.
Claim 3
Dependent Claim
46 words
A vibration generator in accordance with claim 1, wherein said last mentioned means is incapable of transmitting motion from said means to said motor means, whereby forces applied to said frame element are not transmitted to said mass to disturb the frequency of a generated vibration.
Claim 4
Dependent Claim
17 words
Structure in accordance with claim 2, wherein said last mentioned means includes a rack and pinion interconnection.
Claim 5
Dependent Claim
18 words
Structure in accordance with claim 2, in which said last mentioned means includes a nut and screw combination.
Claim 6
Dependent Claim
31 words
Structure in accordance with claim 2, wherein said last mentioned means includes a helicoidal spiral associated with said casing element, and means engaging said helicoidal spiral driven by said motor shafts.
Claim 7
Dependent Claim
22 words
Structure in accordance with claim 2, in which the rotating parts comprising the driving means have a relatively small moment of inertia.
Claim 8
Dependent Claim
17 words
Structure in accordance with claim 2, in which the rotating motor is of an electrical servomotor type.
Claim 9
Dependent Claim
38 words
Structure in accordance with claim 2, including a reciprocating mass moved in either of two Opposite directions by rotational movement of said motor driving a shaft mounting a radially extending link engaging a helix on said casing element.
Claim 10
Dependent Claim
17 words
Structure in accordance with claim 8, in which said motor forms a part of the reciprocating mass.
Claim 11
Dependent Claim
114 words
A vibration generator adapted to impart a vibrating motion to a structure to be studied, particularly an aircraft wing, comprising means for fixing the generator to said structure, an inertia mass adapted to be moved with a reciprocating linear movement along a path extending substantially perpendicularly to said fixing means, guiding means of said mass depending from said fixing means, bi-directional rotative electrical motor means having an output power shaft, a current generator feeding said motor means, mechanical torque transmitting means on said shaft, and torque reception means cooperating with said torque transmitting means, whereby rotation of said power shaft is converted into a reciprocating movement of said mass which generates said vibration motion.
Claim 12
Dependent Claim
114 words
A vibration generator adapted to impart a vibrating motion to a structure to be studied, particularly an aircraft wing, comprising means for fixing the generator to said structure, an inertia mass adapted to be moved with a reciprocating linear movement along a path extending substantially perpendicularly to said fixing means, guiding means of said mass depending from said fixing means, bi-directional rotative electrical motor means having an output power shaft, a current generator feeding said motor means, mechanical torque transmitting means on said shaft, and torque reception means cooperating with said torque transmitting means, whereby rotation of said power shaft is converted into a reciprocating movement of said mass which generates said vibration motion.
Claim 13
Dependent Claim
25 words
A vibration generator according to claim 10, wherein said motor means comprise two electrical motors the rotors of which are integral with said power shaft.
Claim 14
Dependent Claim
15 words
A vibration generator according to claim 11, wherein said motors are of the servomotor type.
Claim 15
Dependent Claim
48 words
A vibration generator according to claim 10, wherein said mechanical torque transmitting means comprise a toothed gear fixed on said shaft and wherein said torque reception means cooperating with said torque transmitting means is a rack attached to said fixing means and traversing said mass through openings thereof.
Claim 16
Dependent Claim
18 words
A vibration generator according to calim 10, further comprising spring means between said fixing means and said mass.
Claim 17
Dependent Claim
18 words
A vibration generator according to calim 10, further comprising spring means between said fixing means and said mass.
Claim 18
Dependent Claim
20 words
A vibration generator according to claim 10, wherein said mass is made of solid block and of said motor means.
Claim 19
Dependent Claim
25 words
A vibration generator according to claim 15, wherein said mass further comprises washers adapted to be removably secured on the end portions of said shaft.
Claim 20
Dependent Claim
43 words
A vibration generator according to claim 10, wherein said mechanical torque transmitting means is a threaded bar and wherein said torque reception means is a ring nut, means being further provided between said bar and said nut for controlling the mechanical play therebetween.
Claim 21
Dependent Claim
96 words
A vibration generator according to claim 10, wherein said mechanical torque transmitting means comprise a star shaped member fixed to said shaft and rods slidingly mounted within said member, finger members at one end of said rods, and an elastic radially expendible member fixed around said shaft and engaging the other end of said rods, said torque reception means comprising an innerly threaded sleeve attached to said fixing means, whereby cooperation of said fingers with said threaded sleeve converts rotation of said power shaft into a reciprocating motion of said mass which comprises said motor means.
Claim 22
Dependent Claim
35 words
A vibration generator according to claim 18, further comprising spring means between said mass and said sleeve, whereby the weight of said mass is compensated and the same is maintained in a constant mean position.
References Cited (Backward Citations)
US916318A
Cited
US1266475A
Cited
US3173040A
Cited
US3583248A
Cited
US3640138A
Cited
US3733914A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |