CN108716519A - A kind of variable element dynamic vibration absorber - Google Patents
A kind of variable element dynamic vibration absorber Download PDFInfo
- Publication number
- CN108716519A CN108716519A CN201810706900.6A CN201810706900A CN108716519A CN 108716519 A CN108716519 A CN 108716519A CN 201810706900 A CN201810706900 A CN 201810706900A CN 108716519 A CN108716519 A CN 108716519A
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- China
- Prior art keywords
- air spring
- connecting rod
- dynamic vibration
- vibration absorber
- supporting rod
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
- F16F7/112—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on fluid springs
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- 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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
- F16F9/0472—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by comprising a damping device
- F16F9/0481—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by comprising a damping device provided in an opening to the exterior atmosphere
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- 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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a kind of variable element dynamic vibration absorbers, including pedestal and the shell being mounted on the base, air spring assembly, connecting rod and supporting rod are installed in the shell, described air spring assembly one end is fixed on the base, the other end is connected with connecting rod, polylith dismountable mass block of stacked arrangement is installed in the connecting rod, the supporting rod is fixed at the top of the inner wall of shell, and the mass block is arranged and is arranged on supporting rod and free to slide along the axis direction of supporting rod.The present invention can realize motivation of adjustment absorber mass parameter by adjusting the quantity of mass block, it is sized to realize adjusting dynamic vibration absorber rigidity and damping parameter by adjusting air spring assembly charged pressure, it can be effectively directed to the purpose that the power system device with different vibration characteristics realizes absorption equipment vibration, reduces apparatus body noise, have the advantages that simple in structure, easy to process, easy to loading and unloading, reasonable design, be easy to motivation of adjustment characterisitic parameter.
Description
Technical field
The present invention relates to power system device damping technologies, and in particular to a kind of variable element dynamic vibration absorber.
Background technology
As urban population density and electricity consumption scale gradually increase, to provide required electric power to resident, some electric power are set
The standby such as installation sites such as transformer and its mating switch board are generally closer apart from residential building, because electromagnetism is imitated when equipment is run
Vibration equipment should be will produce, the low-frequency noise of equipment is eventually exhibited as, thus the life and rest for influencing resident are drawn in recent years
The resident of hair complains and dispute also getting worse.Since this kind of number of devices is numerous, it is low to carry out thorough upgrading to equipment
Although noise, low vibration equipment can solve the problems, such as, investment is huge.A kind of it can be easily installed dismounting and cost if can invent
Cheap dynamic vibration absorber uses flexible absorbing measure to vibrating larger equipment, effectively reduces low caused by vibration equipment
Frequency noise, undoubtedly a kind of practicable means.Since power system device vibration characteristics differs, the power of preset parameter is inhaled
The device that shakes cannot be satisfied the requirement of a wide range of equipment vibration damping, so for a kind of different seriations of vibration equipment characteristic invention, ginseng
Number can flexible modulation dynamic vibration absorber, it is only necessary to simple adjustment bump leveller inner body parameter can pointedly meet not
With the damping requirements of equipment, undoubtedly there is great engineering application value.
Invention content
The technical problem to be solved in the present invention：For the above problem of the prior art, a kind of variable element power suction is provided
Shake device, and the present invention can realize motivation of adjustment absorber mass parameter by adjusting the quantity of mass block, by adjusting air bullet
Spring component charged pressure, which is sized to realize, adjusts dynamic vibration absorber rigidity and damping parameter, can effectively be directed to and shake with difference
The purpose that the power system device of dynamic characteristic realizes absorption equipment vibration, reduces apparatus body noise, have it is simple in structure, be easy to
Processing, is easy to the advantages of motivation of adjustment characterisitic parameter at easy to loading and unloading, reasonable design.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
The present invention provides a kind of variable element dynamic vibration absorber, including pedestal and the shell that is mounted on the base, described outer
Air spring assembly, connecting rod and supporting rod are installed, described air spring assembly one end is fixed on the base, is another in shell
End is connected with connecting rod, the dismountable mass block of polylith of stacked arrangement is equipped in the connecting rod, the supporting rod is fixed
At the top of the inner wall of shell, and the mass block is arranged and is arranged on supporting rod and along the axis direction free skating of supporting rod
It is dynamic.
Preferably, the air spring assembly include the lower cover being sequentially connected, lower snap ring, air spring, upper snap ring and on
Lid is connected and fixed by connector and grips air spring upper end and keep sealing between the lower snap ring and lower cover,
It is connected and fixed by connector between the upper snap ring and upper cover and air spring lower end is gripped and keeps sealing, the sky
The Inflation door core of gas spring is mounted on lower cover or upper lid, and the lower cover is fixed on the base, the upper cover and connecting rod phase
Even.
Preferably, it is arranged with girdle ring on the air spring.
Preferably, thread segment and locking nut are set in the connecting rod, mass block is clamped to by the locking nut
In connecting rod.
Preferably, the mass block is arranged with respect to the axisymmetrical of connecting rod, the support being fixed at the top of the inner wall of shell
Bar quantity is two, and two supporting rods are arranged with respect to the axisymmetrical of connecting rod.
Preferably, the bottom of the pedestal is equipped with magnet piece.
Compared to the prior art, the present invention has following advantageous effects：
1, the mass block described in dynamic vibration absorber proposed by the invention is lamination, can be by increasing and decreasing number of laminations
Achieve the purpose that motivation of adjustment absorber mass parameter；
2, the spring described in dynamic vibration absorber proposed by the invention is rubber air spring, can be by adjusting air bullet
Spring internal pressure achievees the purpose that motivation of adjustment bump leveller rigidity and damping parameter；
3, dynamic vibration absorber carrying magnetic pedestal proposed by the invention, can easily angle be adsorbed in any direction
The magnetic conductivity power equipment outer surface for needing vibration damping reaches the vibration of absorption equipment ontology, reduces the purpose of noise of equipment.
Description of the drawings
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Fig. 2 is the absorbing mechanical model schematic diagram of the embodiment of the present invention.
Marginal data：1, pedestal；2, shell；3, air spring assembly；31, lower cover；32, lower snap ring；33, air spring；
331, Inflation door core；332, girdle ring；34, upper snap ring；35, upper cover；4, connecting rod；41, thread segment；42, locking nut；5, it supports
Bar；6, mass block；7, magnet piece
Specific implementation mode
As shown in Figure 1, the variable element dynamic vibration absorber of the present embodiment includes pedestal 1 and the shell on pedestal 1
2, air spring assembly 3, connecting rod 4 and supporting rod 5 are installed in shell 2,3 one end of air spring assembly is fixed on pedestal 1
The upper, other end is connected with connecting rod 4, and the dismountable mass block 6 of polylith of stacked arrangement is equipped in connecting rod 4, and supporting rod 5 is solid
At the top of the inner wall of shell 2, and mass block 6 is arranged and is arranged on supporting rod 5 and along the axis direction free skating of supporting rod 5
It is dynamic.Motivation of adjustment absorber mass parameter can be realized by adjusting the quantity of mass block 6, by adjusting air spring assembly 3
Charged pressure, which is sized to realize, adjusts dynamic vibration absorber rigidity and damping parameter, and can effectively be directed to has different vibration characteristics
Power system device realize absorption equipment vibration, reduce apparatus body noise purpose, have it is simple in structure, easy to process,
Easy to loading and unloading, reasonable design is easy to the advantages of motivation of adjustment characterisitic parameter.
In the present embodiment, pedestal 1 is aluminium material, is in frustum cone structure, and the lower mouth inner wall of round platform and shell 2 is closely matched thereon
It closes, lower round platform is connected by embedded screw and the locking of shell 2.
In the present embodiment, shell 2 is cylinder-like structure, under the conditions of the dynamic vibration absorber possible application outdoors, institute
Using its enclosure material as aluminium, shell 2 is lower openings pattern, two tapped through holes that top preset is arranged symmetrically, convenient for branch
The fixation of strut 5.
As shown in Figure 1, air spring assembly 3 includes lower cover 31, lower snap ring 32, air spring 33, the upper card being sequentially connected
Ring 34 and upper cover 35 are connected and fixed by connector between lower snap ring 32 and lower cover 31 and grip 33 upper end of air spring
And sealing is kept, it is connected and fixed by connector between upper snap ring 34 and upper cover 35 and 33 lower end of air spring is gripped and protected
Hold sealing, the Inflation door core 331 of air spring 33 is mounted in upper cover 35, and lower cover 31 is fixed on pedestal 1, upper cover 35 with connect
Bar 4 is connected.In the present embodiment, upper cover 35 is stainless steel, is in truncated cone-shaped structure, the tapped through hole of setting inflation thereon, screw thread
The Inflation door core 331 that air spring 33 is installed on through-hole, passes through Inflation door core using the inflator or inflator that are shown with pressure
Compressed air is injected air spring 33 by 331, and the rigidity and damping parameter of air spring 33 are adjusted by adjusting the blowing pressure；
35 lower part of upper cover is bolted connection with upper snap ring 34 so that upper snap ring 34 and the cooperation of upper cover 35, suitable for reading by air spring 33
Locking, prevents internal compressed air from leaking out；Air spring 33 is rubber material, can be to air bullet by adjusting its internal pressure
The rigidity of spring and damping are adjusted, to adjust the rigidity and damping parameter of the dynamic vibration absorber.To enhance air spring
Stability under 33 inflated conditions is arranged with girdle ring 332 on air spring 33.Girdle ring 332 is stainless steel in the present embodiment,
In annular shape.33 times mouths of air spring are locked by lower snap ring 32 and lower cover 31, prevent internal compressed air from being leaked out by lower mouth；
The lower snap ring 32 and lower cover 31 are stainless steel, are fastenedly connected by stainless steel bolt, and lower cover 31 is with pedestal 1 by not
Rust steel bolt is fastenedly connected.
In the present embodiment, connecting rod 4 is stainless steel, and tail portion is external thread structure, can be incited somebody to action by helicitic texture
Mass block 6 is whole to be fixedly connected with the upper cover 35 of air spring assembly 3.
As shown in Figure 1, setting thread segment 41 and locking nut 42 in connecting rod 4, locking nut 42 grips mass block 6
In connecting rod 4.Polylith mass block 6 can be combined into a big mass block of cylinder by connecting rod 4 and locking nut 42.
In the present embodiment, supporting rod 5 is stainless steel, and supporting rod 5 is external thread structure close to head, is fixed on shell
In 2 screw top hole, the tail portion of supporting rod 5 is polished rod structure, is played a supporting role to mass block 6, mass block 6 may only edge
The axial movement of supporting rod 4.
As shown in Figure 1, axisymmetrical arrangement of the mass block 6 with respect to connecting rod 4, the branch being fixed at the top of the inner wall of shell 2
5 quantity of strut is two, and two supporting rods 5 are with respect to the axisymmetrical arrangement of connecting rod 4.
In the present embodiment, mass block 6 is stainless steel structure in the form of annular discs, can be required according to dynamic vibration absorber
Quality is increased and decreased, and plays the role of adjusting quality.There are 2 smooth through-holes on per tablet quality block 6, after coordinating with supporting rod 4,
The direction of motion of mass block 6 is limited in the axial direction along supporting rod 4, and dynamic vibration absorber is facilitated to be installed along any direction.
As shown in Figure 1, the bottom of pedestal 1 is equipped with magnet piece 7, the variable element dynamic vibration absorber of the present embodiment is according to attached drawing
After 1 is completed, if you need to which this reality can be realized in use, being adsorbed on the magnetic conductive shell of power system device by magnet piece 7
Apply the Fast Installation of the variable element dynamic vibration absorber of example.In the present embodiment, 4 circles of 1 lower part of pedestal setting symmetric arrays
Blind hole, blind hole is interior to be arranged 4 circular magnet pieces 7, and magnet piece 7 passes through strength glue sticking with pedestal 1, and magnet piece 7 specifically uses
The rubidium magnet of strength.In addition, the variable element dynamic vibration absorber of the present embodiment can also be pasted onto electric system by seccotine
In the non-magnetic shell of equipment.Mass block 6 is stainless steel lamination, can reach motivation of adjustment suction by increasing and decreasing number of laminations
The purpose for device quality of shaking.Air spring 33 is rubber material, can reach motivation of adjustment by adjusting air spring the blowing pressure
Bump leveller rigidity, the purpose of damping.Dynamic vibration absorber proposed by the invention carries magnet piece 7, can be with any angle, direction
It is adsorbed on power system device magnetic conduction surface, or the non-magnetic surface of power system device is pasted onto by seccotine.To be directed to
Different application objects, adjusting three quality, rigidity, damping dynamic parameters of the dynamic vibration absorber can realize to quilt
The effect of dampening apparatus absorbing finally plays the purpose of equipment noise reduction.Its is simple in structure simultaneously, easy to process, of low cost, fits
Conjunction is widely applied.
The power system device of vibration damping will be needed to regard main vibrating system as, this implementation being connected on power system device shell
The variable element dynamic vibration absorber of example can regard vibration subsystem as.The purport of dynamic absorber is the vibrational energy main vibrating system
Amount is transferred on subsystem, in the damping link between the energy expenditure of transfer and main vibrating system, vibration subsystem, by being set by vibration damping
The mechanical model that the standby variable element dynamic vibration absorber with the present embodiment forms is as shown in Fig. 2, wherein need the electric system of vibration damping
Equipment is that main vibrational system is vibration control object, it is assumed that quality M, rigidity K.The variable element dynamic absorber of the present embodiment
Device can regard a single-freedom vibration system as, if its quality is m, rigidity k, damping be c.Under normal circumstances, power is inhaled
Device quality of shaking is much smaller than main vibrating system mass M.Shown in the kinetics equation such as formula (1) for then having variable element dynamic vibration absorber；
In formula (1), M is the quality of main vibrational system, and K is the rigidity of main vibrational system, and m is the quality for vibrating subsystem, k
It is the damping for vibrating subsystem, x for the rigidity of vibration subsystem, c1For main vibrating system vibratory response, x2It is rung for vibration subsystem
It answers.The effect for considering the simple harmonic quantity external force as shown in formula (2), then respond x1And x2It can indicate as shown in formula (3)；
F (t)=F0sin(ωt) (2)
In formula (2), F (t) is the simple harmonic quantity external force of t moment, F0For the amplitude of simple harmonic quantity external force, ω is the angular frequency of simple harmonic quantity external force
Rate _.
In formula (3), x1For main vibrating system vibratory response, x2To vibrate subsystem responses, X1For main vibrating system vibratory response width
Value, X2To vibrate subsystem response amplitude, ω is the angular frequency of simple harmonic quantity external force, and t is the time.
Expression formula substitution formula (1) derivation will be responded shown in formula (3) can obtain formula (4)；
Each parameter is identical as formula (1) and formula (3) in formula (4), and details are not described herein.
It is further derived by shown in main and sub vibrational system amplitude expression formula such as formula (5)；
In formula (4), | X1| it is main vibrating system amplitude, | X2| for remaining each parameter of sub- vibrational system amplitude and formula (1) and formula
(3) identical, details are not described herein.
Parameter is introduced for main and sub vibrational system amplitude expression formula：Mass ratio μ, damping ratioQuiet deformation Xst, forced oscillation
Dynamic frequency ratio λ, natural frequency ratio γn, respectively as shown in formula (6)~formula (10)；
μ=m/M (6)
Xst=F0/K (8)
λ=ω/Ωn (9)
γ=ωn/Ωn (10)
In formula (6)~formula (10), ωnFor sub- vibrational system angular frequency, ΩnFor main vibrational system angular frequency, remaining each parameter
Identical as formula (1) and formula (3), details are not described herein.
Being arranged to formula (4) using formula (6)~formula (10) these parameters can obtain under dynamic vibration absorber effect, exciting
Power transmits shown in multiplying power such as formula (11) amplitude of main vibrating system；
In formula (11), left side | X1|/XstLower exciting force is acted on for dynamic vibration absorber to transmit again the amplitude of main vibrating system
Rate, each parameter in right side are respectively that formula (the 6)~formula introduced for main and sub vibrational system amplitude expression formula is joined shown in (10)
Number.By formula (11) it is found that exciting force transmits multiplying power and mass ratio, damping ratio and forcing frequency etc. to the amplitude of main vibrating system
Parameter is related.When main vibrating system is constant, it is believed that main vibrating system M, stiffness K immobilize, by adjusting the dynamic absorber
The quality m of device, that is, subsystem, rigidity k, c is damped to adjust mass ratio, damping ratio and forcing frequency, it can be achieved that being to main shake
The adjustment of system vibration amplitude, this is the most essential principle of variable mass bump leveller.In the present invention, it is meant that inhaled by adjusting power
The quality m of the quantity adjusting dynamic vibration absorber of the mass block 6 to shake described in device inside, by adjusting the inside of air spring assembly 3
Pressure adjusts the rigidity k and damped coefficient c of the dynamic vibration absorber, so that it may with to playing absorbing effect by dampening apparatus ontology
Fruit, to finally realize the purpose of equipment noise reduction.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of variable element dynamic vibration absorber, it is characterised in that：Shell including pedestal (1) and on pedestal (1)
(2), air spring assembly (3), connecting rod (4) and supporting rod (5), the air spring group are installed in the shell (2)
Part (3) one end is fixed on pedestal (1), the other end is connected with connecting rod (4), and stacked arrangement is equipped on the connecting rod (4)
The dismountable mass block of polylith (6), the supporting rod (5) is fixed at the top of the inner wall of shell (2), and the mass block (6)
Be arranged be arranged in it is on supporting rod (5) and free to slide along the axis direction of supporting rod (5).
2. variable element dynamic vibration absorber according to claim 1, it is characterised in that：Air spring assembly (3) packet
Include the lower cover (31) being sequentially connected, lower snap ring (32), air spring (33), upper snap ring (34) and upper cover (35), the lower snap ring
(32) it is connected and fixed by connector between lower cover (31) and air spring (33) upper end is gripped and keeps sealing, institute
It states to be connected and fixed by connector between snap ring (34) and upper cover (35) and air spring (33) lower end is gripped and kept
The Inflation door core (331) of sealing, the air spring (33) is mounted in upper cover (35), and the lower cover (31) is fixed on pedestal
(1) on, the upper cover (35) is connected with connecting rod (4).
3. variable element dynamic vibration absorber according to claim 2, it is characterised in that：It is arranged on the air spring (33)
There is girdle ring (332).
4. variable element dynamic vibration absorber according to claim 1, it is characterised in that：Screw thread is set on the connecting rod (4)
Mass block (6) is clamped in connecting rod (4) by section (41) and locking nut (42), the locking nut (42).
5. variable element dynamic vibration absorber according to claim 1, it is characterised in that：The mass block (6) is opposite to be connected
The axisymmetrical of bar (4) arranges that supporting rod (5) quantity being fixed at the top of the inner wall of shell (2) is two, and two supporting rods
(5) axisymmetrical of opposite connecting rod (4) is arranged.
6. the variable element dynamic vibration absorber according to any one of Claims 1 to 5, it is characterised in that：The pedestal
(1) bottom is equipped with magnet piece (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810706900.6A CN108716519A (en) | 2018-07-02 | 2018-07-02 | A kind of variable element dynamic vibration absorber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810706900.6A CN108716519A (en) | 2018-07-02 | 2018-07-02 | A kind of variable element dynamic vibration absorber |
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ID=63912463
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822000A (en) * | 2019-11-18 | 2020-02-21 | 珠海格力电器股份有限公司 | Vibration absorber with adjustable vibration reduction frequency band and air conditioning unit |
| CN111342879A (en) * | 2020-03-09 | 2020-06-26 | 张爱桥 | Mobile phone signal amplifier for 5G communication signal |
| CN112178105A (en) * | 2020-09-04 | 2021-01-05 | 宝能(广州)汽车研究院有限公司 | Dynamic vibration absorber and using method thereof |
| CN113218605A (en) * | 2021-04-08 | 2021-08-06 | 中国科学院声学研究所 | Movable ultralow-vibration large-scale equipment test platform |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110822000A (en) * | 2019-11-18 | 2020-02-21 | 珠海格力电器股份有限公司 | Vibration absorber with adjustable vibration reduction frequency band and air conditioning unit |
| CN110822000B (en) * | 2019-11-18 | 2023-12-22 | 珠海格力电器股份有限公司 | Vibration absorber with adjustable vibration reduction frequency band and air conditioning unit |
| CN111342879A (en) * | 2020-03-09 | 2020-06-26 | 张爱桥 | Mobile phone signal amplifier for 5G communication signal |
| CN112178105A (en) * | 2020-09-04 | 2021-01-05 | 宝能(广州)汽车研究院有限公司 | Dynamic vibration absorber and using method thereof |
| CN113218605A (en) * | 2021-04-08 | 2021-08-06 | 中国科学院声学研究所 | Movable ultralow-vibration large-scale equipment test platform |
| CN113218605B (en) * | 2021-04-08 | 2022-06-14 | 中国科学院声学研究所 | Movable ultralow-vibration large-scale equipment test platform |
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