AU2021102479A4 - Shape memory alloy-based vibration isolation and attenuation support - Google Patents
Shape memory alloy-based vibration isolation and attenuation support Download PDFInfo
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- AU2021102479A4 AU2021102479A4 AU2021102479A AU2021102479A AU2021102479A4 AU 2021102479 A4 AU2021102479 A4 AU 2021102479A4 AU 2021102479 A AU2021102479 A AU 2021102479A AU 2021102479 A AU2021102479 A AU 2021102479A AU 2021102479 A4 AU2021102479 A4 AU 2021102479A4
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- Prior art keywords
- leaf spring
- shape memory
- memory alloy
- spring
- vibration isolation
- Prior art date
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- Ceased
Links
- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 54
- 238000002955 isolation Methods 0.000 title claims abstract description 29
- 230000004044 response Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 10
- 238000013016 damping Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 230000001419 dependent effect Effects 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000006870 function Effects 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract 1
- 239000000956 alloy Substances 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
- F16F3/02—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction
- F16F3/023—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction composed only of leaf springs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/18—Leaf springs
- F16F1/26—Attachments or mountings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
Disclosed is a shape memory alloy-based vibration isolation and attenuation
support. The shape memory alloy-based vibration isolation and attenuation support
comprises a leaf spring set, an upper panel and a lower panel. The leaf spring set is
made from a memory metal. During work, a relative vertical separation distance
between the upper panel and the lower panel will change under a vibrating load action
of the upper panel or the lower panel, so that on the one hand, the shape memory alloy
leaf spring set is compressed to deform for energy absorption or is restored for energy
release, thereby achieving a vibration isolation and attenuation purpose dependent on
special structure and material characteristics of the shape memory alloy leaf spring set,
and on the other hand, a shape memory alloy rope is stretched or retracted to deform
simultaneously while the shape memory alloy leaf spring set deforms alternately,
thereby providing large hysteretic energy consumption and restoring force dependent
on functions of the structure and material of the shape memory alloy rope. The shape
memory alloy-based vibration isolation and attenuation support can resist vertical
vibration effectively, is good in damping effect and high in energy-dissipating
capacity, has extremely high reliability and stability in long-term work, can be
restored automatically after being vibrated again, and is not additionally provided
with a reset device.
2 4 3 5
6
13
1
>A
9 12 11 10 7
Fig. 1
2 8 4 10 5 6 7 9
Fig. 2
7 6 5 8
Fig. 3
1 /'2
Description
2 4 3 5
6 13 1
>A
9 12 11 10 7
Fig. 1 2 8 4 10 5 6 7 9
Fig. 2 7 6 5 8
Fig. 3
1 /'2
TECHNICAL FIELD The present invention relates to the technical field of shock absorption of
mechanical engineering and civil engineering, in particular to a shape memory alloy
based vibration isolation and attenuation support.
The vibration isolation and attenuation support is an apparatus mounted between
an upper structure and a lower structure or between an upper portion structure and a
pedestal. The apparatus mainly dissipates, isolates or delays vibrating energy by
increasing the flexibility of a structure, prolonging a natural vibration period of the
structure and increasing the damping of the structure to achieve a purpose of reducing
vibration response of the structure to protect the structure, thereby avoiding vibration
damages.
The vibration isolation and attenuation support in the prior art is mainly divided
into a rubber blanket support, a sliding friction support and a friction swing support,
wherein the rubber blanket support has certain isolation and attenuation performance
in a horizontal direction. As the rubber blanket support is small in damping and is not
enough in energy-dissipating capacity, the rubber blanket support is helpless to
vertical vibration caused by an earthquake, a rail traffic or a punching machine and is
combined with other dampers or energy-dissipating apparatuses in structural use. In
addition, a rubber material in use further has the problems of aging, corrosion and
environmental pollution. The sliding friction support and the friction swing support
limit transfer and feedback of the vibrating energy effectively by means of a relative
sliding motion and friction energy dissipation. The method is reliable in stress and
small in construction difficulty without considering problems of rust protection and
damaged part replacement of steel parts. The maximum defect of the support is to configure the reset mechanism device additionally and otherwise the structure after vibration cannot be restored. In addition, the sliding friction support and the friction swing support also have the defects of poor vertical vibration-resistant capacity and poor stability performance.
In order to solve the problem, the present invention aims to provide a shape
memory alloy-based vibration isolation and attenuation support. The support can
resist vertical vibration effectively during vibration isolation and attenuation work, is
good in damping effect and high in energy-dissipating capacity, has extremely high
reliability and stability in long-term work, can be restored automatically after being
vibrated again, and is not additionally provided with a reset apparatus.
In order to achieve the purpose, a technical scheme of the present invention is as
follows: a shape memory alloy-based vibration isolation and attenuation support
includes a leaf spring set, an upper panel and a lower panel,
wherein the leaf spring set is formed by overlaying no less than one cross leaf
spring, each of the leaf springs is provided with four spring arms, and two lugs and
two spring eyes are arranged at the tail ends of the four spring arms of the uppermost
leaf spring successively; the spring eyes are curly bend boards; the leaf spring is made
from a shape memory alloy; a threaded through hole is formed in a middle portion of
each of leaf springs;
the lower panel is a round steel plate, and a middle portion of the lower panel is
provided with a spherical groove, and the radius of curvature of the groove is equal to
the radius of curvature of a lower edge of the lowermost leaf spring; the lowermost
leaf spring is fixedly connected with the groove by means of a friction force; the
middle portion of the lower panel is provided with a threaded through hole matched
with the leaf spring and is fixedly connected with the leaf spring set through bolts; and the spring set is further provided with no less than one spring hoop used for fixing the spring arms of the leaf spring set; and a main body of the upper panel is a round steel plate, and a semi-circular boss is arranged on an edge below the main body; two notches matched with the two spring eyes are formed in a side, far away from the boss, of the upper panel, and two opposite spring eye connectors are arranged at the tail end of each notch; the spring eye connectors are hinged with the spring eye through bolts; and the boss is matched with the lugs and presses the lugs.
Further, rope through holes are formed in positions, close to the tail ends, of the
four leaf springs of the uppermost leaf spring, and every two opposite spring arms are
tightened and reinforced with a shape memory alloy rope by the rope through holes.
Further, the leaf spring set is formed by stacking no less than one leaf spring and
the spring arm of the shorter leaf spring is shorter than the spring arm of the longer
leaf spring.
Compared with the prior art, the present invention has the advantages that
1.The shape memory alloy leaf spring and the shape memory alloy rope are used,
not only utilizing a good super-elastic effect and a high damping characteristic of the
shape memory alloy material, but also utilizing the characteristics of the structure.
Response of the support under vibration is inhibited extremely by effective
combination of the shape memory alloy leaf spring and the shape memory alloy rope,
so that the self-resetting capacity and the vibration isolation and attenuation effect of
the support are improved greatly, and the service life of the structure is prolonged and
the reliability of the structure is improved. In particular, the shape memory alloy rope
has double effects of the damper and the resetting mechanism apparatus as well, so
that the maintenance cost of the structure is lowered.
2. The support of the present invention is comprised of components of simple
structural forms. The rigidity of the leaf spring can be changed by adjusting the shape,
dimension or quantity of the leaf springs during operation, and furthermore, the vibrating frequency of the structure can be controlled, and the damping coefficient of the structure can be adjusted by changing the shape, dimension or quantity of the leaf springs and ropes, so that the damping ratio of the whole system is further changed, and the using convenience of the support is improved.
3. The material used by the leaf spring and the rope is good in corrosion
resistance and plasticity, high in strength and fatigue resistance, so that the durability
of the support and the stability of parameters are improved and the environmental
influence is reduced.
4. The vibration isolation and attenuation member made from common material
is replaced by the shape memory alloy material leaf spring and the rope and the
application range of the support is expanded obviously, so that the support is not only
suitable for meeting the vibration isolation and attenuation demand in a large structure,
but also suitable for meeting the vibration isolation and attenuation demand in a small
structure.
Fig. 1 is a three-dimensional section structural schematic diagram of the present
invention;
Fig. 2 is an A-A section view of Fig. 1;
Fig. 3 is a three-dimensional structural schematic diagram of a downward view
of the upper panel of the present invention;
Fig. 4 is a three-dimensional structural schematic diagram of the uppermost leaf
spring of the present invention;
Fig. 5 is a three-dimensional structural schematic diagram of the lower leaf
spring of the present invention;
Fig. 6 is a three-dimensional structural schematic diagram of the lower panel of
the present invention;
Fig. 7 is a curve between stress and strain of the shape memory alloy rope of the
present invention;
Fig. 8 is a curve of restoration stress and restoration ratio of the shape memory
alloy rope of the present invention;
Fig. 9 is a comparison curve of response spectra of vibration displacements of
the upper panel and the lower panel of the support of the present invention.
In the drawings, 1, leaf spring set, 2, lug, 3, spring eye, 4, shape memory alloy
rope, 5, upper panel, 6, notch, 7, spring eye connector, 8, boss, 9, bolt, 10, spring hoop,
11, lower panel, 12, groove, 13, leaf spring.
Further description of the present invention will be made below in combination
with drawings.
As shown in the Fig. 1 to Fig. 6, a shape memory alloy-based vibration isolation
and attenuation support includes a leaf spring set 1, an upper panel 5 and a lower
panel 11,
wherein the leaf spring set 1 is formed by overlaying no less than one cross leaf
spring 13, each of the leaf springs 13 is provided with four spring arms, and two lugs
and two spring eyes 3 are arranged at the tail ends of the four spring arms of the
uppermost leaf spring 13 successively; the spring eyes 3 are curly bend boards; the
leaf spring 13 is made from a shape memory alloy; a threaded through hole is formed
in a middle portion of each of leaf springs 13;
the lower panel 11 is a round steel plate, and a middle portion of the lower panel
is provided with a spherical groove 12, and the radius of curvature of the groove 12 is
equal to the radius of curvature of a lower edge of the lowermost leaf spring 13; the
lowermost leaf spring 1-2 is fixedly connected with the groove 12 by means of a
friction force; the middle portion of the lower panel 11 is provided with a threaded
through hole matched with the leaf spring 13 and is fixedly connected with the leaf spring set 1 through bolts 9; and the spring set 1 is further provided with no less than one spring hoop 10 used for fixing the spring arms of the leaf spring set 1; and a main body of the upper panel 5 is a round steel plate, and a semi-circular boss 8 is arranged on an edge below the main body; two notches 6 matched with the two spring eyes 3 are formed in a side, far away from the boss 8, of the upper panel 5, and two opposite spring eye connectors 7 are arranged at the tail end of each notch 6; the spring eye connectors 7 are hinged with the spring eyes 3 through bolts 9; and the boss 8 is matched with the lugs 2 and presses the lugs 2.
Rope through holes are formed in positions, close to the tail ends, of the four leaf
springs 13 of the uppermost leaf spring 13, and every two opposite spring arms are
tightened and reinforced with a shape memory alloy rope 4 by the rope through holes.
The leaf spring set 1 is formed by stacking no less than one leaf spring 13 and the
spring arm of the shorter leaf spring 13 is shorter than the spring arm of the longer
leaf spring 13.
During work, a relative vertical separation distance between the upper panel 5
and the lower panel 11 will change under a vibrating load action of the upper panel 5
or the lower panel 11, so that on the one hand, the shape memory alloy leaf spring set
1 is compressed to deform for energy absorption or is restored for energy release,
thereby achieving a vibration isolation and attenuation purpose dependent on special
structure and material characteristics of the shape memory alloy leaf spring set 1, and
on the other hand, a shape memory alloy rope is stretched or retracted to deform
simultaneously while the shape memory alloy leaf spring set deforms alternately,
thereby providing large hysteretic energy consumption and restoring force dependent
on functions of the structure and material of the shape memory alloy rope 4.
The above manufactured shape memory alloy vibration isolation and attenuation
support is subjected to an experiment, and acquired experimental data is as shown in
the Fig. 7 to Fig. 9. Fig. 7 provides a relationship curve between stress and strain
under loading and unloading circumstances of the shape memory alloy rope 4 of the support of the present invention. It can be seen from the Fig. 7 that affected by loading and unloading a cyclic load, the curve between stress and strain of the shape memory alloy rope 4 demonstrates a typical hysteretic closed curve, i.e. an energy dissipating hysteretic ring, and the larger the energy consumed by the energy dissipating hysteretic ring is, the better the energy-dissipating effect is. However, the curve by no means demonstrates an obvious stress platform in the loading/unloading process or a large energy-dissipating hysteretic ring because on a few part of the alloy material in the rope is subjected to martensite phase transformation and most part of material is still in a state of elastic deformation. In spite of this, the shape memory alloy rope 4 shows a good energy-dissipating characteristic obviously and has an excellent energy-dissipating hysteretic ring and high recovery capability. The energy dissipating hysteretic ring is increased as an external load is increased (as shown in the Fig. 7, the external load of the curve 2 is larger than that of the curve 1). The Fig.
8 is a restoring force and a restoration ratio curve of the stretching and retracting
experiment of the shape memory alloy rope 4. It can be seen from the Fig. 8 that the
restoring force of the shape memory alloy rope 4 can reach over 590 Mpa after being
stretched properly. When the strain quantity of the shape memory alloy rope 4 reaches
about 10%, the shape memory alloy rope can generate the restoring force which
reaches up to 690 MPa (the curve 4 as shown in the Fig. 8). In addition, the maximum
complete restoring strain reaches up to 10%. When the strain is lower than the value
and the rope is unloaded, the strain generated by the rope can be restored completely,
i.e. the restoration ratio is 100%. When the strain is higher than the value and the rope
is unloaded, the strain generated by the rope cannot be restored completely (the curve
3 as shown in the Fig. 8). It can be seen that the self-resetting capacity of the support
of the present invention is very strong. The Fig. 9 provides a comparative curve of
response spectra of vibration displacements of the upper panel 5 and the lower panel
11 of the support of the present invention. After the excitation load is applied to the
lower panel 11, displacement responses with different frequencies of the upper panel are about 1/4 of those of the lower panel 11, i.e., the frequency displacement response of the structure of the upper panel 5 is reduced greatly. Thus, it is illustrated that the vibration resistance at the upper panel 5 is perfected and improved well compared with that of the structure of the lower panel 11. In conclusion, the self resetting capacity of the support of the present invention is strong and the vibration isolation and attenuation effect is prominent.
It can be seen that based on a conventional support, the support of the present
invention draws advantages of a novel shape shape memory alloy material, an original
support made from a common material is replaced by the support made from the
shape shape memory alloy material, and the support further has the advantages of
long fatigue life and small influence on environmental factor as a result of advantages
of the shape shape memory alloy: high damping, high restoring force and deformation,
high corrosion resistance, high strength, high plasticity and the like. Further, the
boundedness of the support in application is reduced. Vibration isolation and
attenuation of the support is not provided by means of the rubber blanket or friction
and is realized simply by means of a shape shape memory alloy member. Meanwhile,
control on vibration isolation and attenuation of the support is converted into
treatment on shape, dimension or quantity of the shape memory alloy member, and
thus, the support is simple in construction process and apparatus, convenient to
operate and safe and reliable in effect for field construction. It can be seen that the
vibration isolation and attenuation support made from the shape shape memory alloy
not only improve the self-restoring forced, the vibration isolation and attenuation
performance, the stability, the safety, the durability and the application range of the
structure, but also has the advantages of simple and reliable process, low investment
and cost and the like.
Those skilled in the art shall understand a main ideal of the present invention.
Although one or one group of cross shape memory alloy leaf spring sets 1 is described
in the present invention, the application range of the present invention is not limited hereto. For example, those skilled in the art design the shape memory alloy leaf spring set 1 in the Fig. 4 in other forms such as a hexagonal star shape, an octagonal star shape and I shape completely and further can expand the shape memory alloy leaf spring set to the sliding friction support and a petaloid structure as well. Surely, the shape memory alloy leaf spring set 1 can be further replaced by the leaf spring set 1 made from other materials and the like. Specific description in the Fig. 4 and Fig. 5 are merely to describe the concept of the present invention clear, those skilled in the art shall understand the quintessence and concepts utilizing vibration isolation and attenuation design of the leaf spring set 1 shall fall within the scope of protection of the present invention.
Claims (3)
1. A shape memory alloy-based vibration isolation and attenuation support,
characterized by comprising a leaf spring set, an upper panel and a lower panel,
wherein the leaf spring set is formed by overlaying no less than one cross leaf
spring, each of the leaf springs is provided with four spring arms, and two lugs and
two spring eyes are arranged at the tail ends of the four spring arms of the uppermost
leaf spring successively; the spring eyes are curly bend boards; the leaf spring is made
from a shape memory alloy; a threaded through hole is formed in a middle portion of
each of leaf springs;
the lower panel is a round steel plate, and a middle portion of the lower panel is
provided with a spherical groove, and the radius of curvature of the groove is equal to
the radius of curvature of a lower edge of the lowermost leaf spring; the lowermost
leaf spring is fixedly connected with the groove by means of a friction force; the
middle portion of the lower panel is provided with a threaded through hole matched
with the leaf spring and is fixedly connected with the leaf spring set through bolts; and
the spring set is further provided with no less than one spring hoop used for fixing the
spring arms of the leaf spring set; and
a main body of the upper panel is a round steel plate, and a semi-circular boss is
arranged on an edge below the main body; two notches matched with the two spring
eyes are formed in a side, far away from the boss, of the upper panel, and two
opposite spring eye connectors are arranged at the tail end of each notch; the spring
eye connectors are hinged with the spring eye through bolts; and the boss is matched
with the lugs and presses the lugs.
2. The shape memory alloy-based vibration isolation and attenuation support
according to claims, characterized in that rope through holes are formed in positions,
close to the tail ends, of the four leaf springs of the uppermost leaf spring, and every
two opposite spring arms are tightened and reinforced with a shape memory alloy
rope by the rope through holes.
3. The shape memory alloy-based vibration isolation and attenuation support
according to claim 1 or 2, characterized in that the leaf spring set is formed by
stacking no less than one leaf spring and the spring arm of the shorter leaf spring is
shorter than the spring arm of the longer leaf spring.
A 2021102479
A
Fig. 1
Fig. 2
Fig. 3
1/3
Fig. 4
Fig. 5
Fig. 6
2/3
(1)Low load 700 (2)High load
600
500
Stress(MPa) 400
300
200
100
0 2021102479
-100 0 1 2 3 4 5 6
Strain(%)
Fig. 7 700 (3)Restoration ratio 120 (4)Restoration stress
680 100 R estoration stress(MPa)
Restoration ratio(%) 80 660
60 640
40 620
20
600 0 0 4 8 12 16 20 24 Strain(﹪)
Fig. 8
0.020 0.005
Lower panel 0.004 the direction of external load (vertical)/m Upper panel, displacement response in Lower panel, displacement response in the
Upper panel 0.015 direction of external load (vertical)/m
0.003
0.002 0.010
0.001
0.005 0.000
-0.001 0.000 -0.002
-0.003 -0.005
-0.004 0 10 20 30 40 50 60 70 80 90 100 110 Frequency/Hz
Fig. 9
3/3
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110367044.8 | 2021-04-06 | ||
| CN202110367044.8A CN112922989A (en) | 2021-04-06 | 2021-04-06 | Vibration isolation and damping support based on memory alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021102479A4 true AU2021102479A4 (en) | 2021-06-24 |
Family
ID=76174183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021102479A Ceased AU2021102479A4 (en) | 2021-04-06 | 2021-05-11 | Shape memory alloy-based vibration isolation and attenuation support |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112922989A (en) |
| AU (1) | AU2021102479A4 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417958B (en) * | 2021-06-25 | 2023-02-28 | 沈阳天贺新材料开发有限公司 | Nickel-titanium shape memory alloy vibration reduction and isolation device |
-
2021
- 2021-04-06 CN CN202110367044.8A patent/CN112922989A/en active Pending
- 2021-05-11 AU AU2021102479A patent/AU2021102479A4/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN112922989A (en) | 2021-06-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |