CN209875832U - Combined type shock absorber - Google Patents
Combined type shock absorber Download PDFInfo
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- CN209875832U CN209875832U CN201920477704.6U CN201920477704U CN209875832U CN 209875832 U CN209875832 U CN 209875832U CN 201920477704 U CN201920477704 U CN 201920477704U CN 209875832 U CN209875832 U CN 209875832U
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- bottom plate
- top plate
- shock absorber
- piezoelectric layer
- elastic
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Abstract
The utility model discloses a combined type shock absorber, which comprises a bottom plate, a top plate and a plurality of elastic pieces, wherein the bottom plate is connected with a piece to be damped; the two ends of all the elastic sheets are respectively connected with the bottom plate and the top plate, the piezoelectric layer is attached to the surface of each elastic sheet, and when an electric field is applied along the polarization direction of the piezoelectric layer, the piezoelectric layer deforms so as to change the rigidity of the elastic sheets; and the lower surface of the top plate is connected with an electromagnetic shock absorber. The utility model discloses an adjust the influence of the change of rigidity reduction by the natural frequency of damping object to the damping effect.
Description
Technical Field
The utility model relates to a shock absorber field, concretely relates to combined type shock absorber.
Background
The operating principle of the damper is that resonance is generated when the natural frequency of the damper itself is equal to the natural frequency of the object to be damped, and the maximum damping effect is achieved by the resonance. However, if the natural frequency of the object to be damped changes due to external factors or self factors, the stiffness of the damper is not controllable in the prior art, and therefore, when the natural frequency of the object to be damped changes, the damping effect of the damper is reduced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a combined type shock absorber, its change through adjusting rigidity reduction by the natural frequency of damping object is to the influence of damping effect.
In order to solve the technical problem, the utility model provides a combined type shock absorber, which comprises a bottom plate, a top plate and a plurality of elastic pieces, wherein the bottom plate is connected with a piece to be damped; the two ends of all the elastic sheets are respectively connected with the bottom plate and the top plate, the piezoelectric layer is attached to the surface of each elastic sheet, and when an electric field is applied along the polarization direction of the piezoelectric layer, the piezoelectric layer deforms so as to change the rigidity of the elastic sheets; and the lower surface of the top plate is connected with an electromagnetic shock absorber.
Further, all the elastic pieces are arranged around the electromagnetic vibration absorber, and the elastic pieces are symmetrically arranged around the electromagnetic vibration absorber.
Furthermore, a coaming is arranged on the bottom plate and surrounds the elastic sheet, and an upper shield is connected to the lower surface of the top plate; when the top plate moves relative to the bottom plate, the upper shield can be embedded into the enclosing plate.
Further, the upper shield comprises an accommodating cavity, the accommodating cavity is concavely arranged on the upper surface of the upper shield, and the upper surface of the upper shield is connected with the top plate.
Furthermore, a limiting column is arranged on the bottom plate, a linear bearing is arranged on the lower surface of the upper shield, and the linear bearing is sleeved on the limiting column to limit the movement of the top plate.
Furthermore, the both ends of flexure strip pass through the fixing base respectively with go up the guard shield with the bottom plate is connected, just the flexure strip with the connection can be dismantled to the fixing base.
Furthermore, the upper end of the coaming is chamfered.
Further, the piezoelectric layer is quartz having piezoelectricity.
The utility model has the advantages that:
1. when an electric field is applied in the polarization direction of the piezoelectric layer, the piezoelectric layer deforms, and the elastic sheet deforms because the piezoelectric layer is attached to the elastic sheet, so that the rigidity of the elastic sheet changes; therefore, by changing the size and the on-off of the electric field on the piezoelectric layer, the rigidity of the elastic sheet can be regulated and controlled to match the natural frequency of the vibration-damped object, and the influence of the change of the natural frequency of the vibration-damped object on the vibration damping effect is reduced;
2. the vibration-damped piece is connected with the bottom plate, the electromagnetic vibration damper is connected with the top plate, and two ends of the elastic sheet are respectively connected with the top plate and the bottom plate; therefore, by combining the electromagnetic damper and the elastic sheet, the fluctuation of the natural frequency of the vibration-damped object can be adapted by adjusting the rigidity of the electromagnetic damper and the rigidity of the elastic sheet, and the influence of the change of the natural frequency of the vibration-damped object on the vibration-damping effect is reduced.
Drawings
Fig. 1 is an overall schematic view of the present invention;
fig. 2 is a cross-sectional view of the present invention;
fig. 3 is a mechanical model of the compound damper.
The reference numbers in the figures illustrate: 1. a base plate; 11. a limiting column; 12. enclosing plates; 2. a top plate; 21. an electromagnetic shock absorber; 3. an upper shield; 31. an accommodating chamber; 32. a linear bearing; 4. an elastic sheet; 41. a fixed seat.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Referring to fig. 1 and 2, an embodiment of a composite vibration absorber of the present invention includes a bottom plate 1, a top plate 2 and a plurality of elastic pieces 4, wherein the bottom plate 1 is connected to a member to be damped. All the elastic pieces 4 are arranged between the top plate 2 and the bottom plate 1, the upper end parts of the elastic pieces 4 are connected with the top plate 2, and the lower end parts of the elastic pieces 4 are connected with the bottom plate 1. The piezoelectric layer is attached to the elastic sheet 4, and the piezoelectric layer may be attached to a single surface of the elastic sheet 4 or both surfaces of the elastic sheet 4. The piezoelectric layer has an inverse piezoelectric effect, and thus when an electric field is applied in the polarization direction of the piezoelectric layer, the piezoelectric layer is deformed because the piezoelectric layer is attached to the elastic sheet 4, the elastic sheet 4 is deformed accordingly when the piezoelectric layer is deformed, and when the electric field is removed, the elastic sheet 4 is restored to its original shape. When the elastic sheet 4 deforms, the rigidity of the elastic sheet can be correspondingly changed, so that the rigidity of the elastic sheet 4 can be changed through an electric field applied to the piezoelectric sheet, the rigidity of the elastic sheet 4 can be adjusted according to the fluctuation of the natural frequency of the damped part, and the system can obtain good vibration performance. The material of the piezoelectric layer in this embodiment is preferably quartz having piezoelectric properties.
Referring to fig. 1 to 3, an electromagnetic damper 21 is fixedly arranged on the lower surface of the top plate 2, primary damping is performed by the electromagnetic damper 21, secondary damping is performed by the elastic sheet 4, and therefore the system can adapt to the fluctuation of the natural frequency of the damped object by combining the electromagnetic damper 21 and the elastic sheet 4, and good vibration characteristics are obtained. The main vibration system of the vibration-damped piece is simplified into an illustrated M-K system, and the vibration composite vibration damper when the vibration output of the main vibration system is equal to the system to apply the exciting force of F-F sin t is simplified into a composite system of a primary mass ma, an electromagnetic force fs, a primary rigidity K, a primary damping c1, a secondary mass M, a secondary adjustable rigidity kf and a secondary damping c 2.
The system motion differential equation is:
the differential equation is thus:
the system impedance after neglecting the electromagnetic force is:
using an equivalent impedance method:
wherein: m iseIs equivalent mass, keIs equivalent stiffness, ceSolving the two equations simultaneously for equivalent damping:
according to the optimal coherent conditions:
wherein: omegan/ΩnIs the ratio of the natural frequency of the damper to the primary system;
mu is the ratio of the mass of the shock absorber to the mass of the main system;
namely:
obtaining by solution:
from the above formula, when the parameters of the shock absorber are fixed, if the main system mass or rigidity fluctuates, the corresponding k is providedfA value; in other words, k can be adjusted by the piezoelectric layerfThe value is such that the damper is always in an optimally coherent state.
Referring to fig. 1, all the elastic pieces 4 are disposed around the electromagnetic damper 21, and the two opposite elastic pieces 4 are symmetrically disposed about the electromagnetic damper 21, so that the deformation of each elastic piece 4 is relatively uniform, and the stiffness of each elastic piece 4 is synchronously adjusted.
Referring to fig. 1 and 2, a surrounding plate 12 is arranged on the upper surface of the bottom plate 1, and all the elastic pieces 4 are positioned inside the surrounding plate 12. The lower surface fixedly connected with of roof 2 goes up guard shield 3, goes up guard shield 3 including its chamber 31 that holds of seting up at its upper surface, goes up guard shield 3's upper surface and roof 2 fixed connection, holds the lower surface setting of chamber 31 towards last guard shield 3, utilizes last guard shield 3 and roof 2 to realize holding the closure of chamber 31. The radius of the outer wall of the upper shield 3 is smaller than that of the inner wall of the enclosure 12, and when the top plate 2 moves downward relative to the bottom plate 1, the upper shield 3 can be embedded inside the enclosure 12. The upper end of the coaming 12 is chamfered so as to facilitate the embedding of the upper shield 3.
Referring to fig. 1, a limiting column 11 is arranged on a bottom plate 1 along the vertical direction, a linear bearing 32 is fixedly arranged on the lower surface of an upper shield 3, and the linear bearing 32 is sleeved on the limiting column 11 and can slide along the axial direction of the limiting column 11. When the top plate 2 and the upper shield 3 move downwards relative to the bottom plate 1, the limiting columns 11 extend into the upper shield 3, so that the accommodating cavity 31 is opened to a depth greater than or equal to the maximum displacement of the downward movement of the top plate 2.
Referring to fig. 1, both ends of the elastic piece 4 are connected to the upper shield 3 and the base plate 1 through fixing seats 41, and the elastic piece 4 is detachably connected to the fixing seats 41, thereby achieving adjustment of the rigidity of the elastic piece 4. The fixing seat 41 is provided with a groove, the elastic sheet 4 is embedded in the groove, and the elastic sheet 4 and the fixing seat 41 can be fixed through the fastening bolt.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (8)
1. A combined type shock absorber is characterized by comprising a bottom plate, a top plate and a plurality of elastic pieces, wherein the bottom plate is connected with a piece to be damped; the two ends of all the elastic sheets are respectively connected with the bottom plate and the top plate, the piezoelectric layer is attached to the surface of each elastic sheet, and when an electric field is applied along the polarization direction of the piezoelectric layer, the piezoelectric layer deforms so as to change the rigidity of the elastic sheets; and the lower surface of the top plate is connected with an electromagnetic shock absorber.
2. The composite vibration absorber as set forth in claim 1 wherein all of said elastomeric sheets are disposed around said electromagnetic vibration absorber and said elastomeric sheets are disposed symmetrically about said electromagnetic vibration absorber.
3. The composite shock absorber as set forth in claim 1, wherein a skirt is provided on said bottom plate, said skirt being disposed around said elastomeric sheet, and an upper shield is attached to a lower surface of said top plate; when the top plate moves relative to the bottom plate, the upper shield can be embedded into the enclosing plate.
4. The composite shock absorber of claim 3, wherein said upper shroud includes a receiving cavity recessed in an upper surface of said upper shroud, said upper surface of said upper shroud being attached to said top plate.
5. The composite shock absorber as set forth in claim 4, wherein a limiting post is disposed on the bottom plate, a linear bearing is disposed on a lower surface of the upper shield, and the linear bearing is fitted over the limiting post to limit the movement of the top plate.
6. The composite vibration absorber as set forth in claim 4, wherein both ends of said elastic piece are respectively connected to said upper shield and said bottom plate through fixing seats, and said elastic piece is detachably connected to said fixing seats.
7. The composite shock absorber of claim 3, wherein the upper end of said shroud is chamfered.
8. The composite vibration absorber of claim 1, wherein said piezoelectric layer is quartz having piezoelectricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920477704.6U CN209875832U (en) | 2019-04-10 | 2019-04-10 | Combined type shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920477704.6U CN209875832U (en) | 2019-04-10 | 2019-04-10 | Combined type shock absorber |
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| Publication Number | Publication Date |
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| CN209875832U true CN209875832U (en) | 2019-12-31 |
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| CN201920477704.6U Active CN209875832U (en) | 2019-04-10 | 2019-04-10 | Combined type shock absorber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064507A (en) * | 2020-08-07 | 2020-12-11 | 中铁大桥局集团有限公司 | Vertical impact buffering device |
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2019
- 2019-04-10 CN CN201920477704.6U patent/CN209875832U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064507A (en) * | 2020-08-07 | 2020-12-11 | 中铁大桥局集团有限公司 | Vertical impact buffering device |
| CN112064507B (en) * | 2020-08-07 | 2022-04-08 | 中铁大桥局集团有限公司 | Vertical impact buffering device |
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