CN209100561U - Active-passive integratedization vibration isolator system - Google Patents
Active-passive integratedization vibration isolator system Download PDFInfo
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- CN209100561U CN209100561U CN201821514886.1U CN201821514886U CN209100561U CN 209100561 U CN209100561 U CN 209100561U CN 201821514886 U CN201821514886 U CN 201821514886U CN 209100561 U CN209100561 U CN 209100561U
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Abstract
The utility model discloses a kind of active-passive integratedization vibration isolator systems, including signal pickup assembly, control device and vibration absorber, signal is simultaneously passed to the control device by the vibration signal of the signal pickup assembly collection machinery equipment, the control device controls the vibration absorber using FxLMS algorithm according to signal and carries out vibration damping, the vibration absorber includes shell, the passive vibration isolation device and electromagnetic actuator that in the shell and the relatively described shell is fixedly installed are set, the passive vibration isolation device is connected in series by decoupling film and electromagnetic actuator, the decoupling film and active vibration insulator of the electromagnetic actuator are attached using axle sleeve, the axle sleeve is fixed on the active vibration insulator, the passive vibration isolation device is fixed on the axle sleeve.The passive vibration isolation device is made of rubber spring, upper lower liquid chamber, inertia channel, decoupling film, and the decoupling film projected area is less than the 1/2 of main spring area.
Description
Technical field
The utility model relates to vibration isolator system, in particular to a kind of active-passive integratedization vibration isolator system.
Background technique
In modern industry and transportation, the vibration of mechanical equipment is often to the precision of whole system, steady
Qualitative, safety, comfort, service life etc. adversely affect, such as in automotive field, reduce engine and are transmitted to
The vibration of vehicle frame can effectively improve the riding comfort of automobile and the reliability of mechanical system；In military boats and ships field, in isolation
A possibility that concealment of military boats and ships can be improved in the vibration of small device (such as compressor), and reduction is detected；In aviation
Space industry, influence of the isolation bad condition such as strenuous vibration to precision instrument is carried, can be improved system operation reliability, etc.
Deng.As modern mechanical is to precision improves, the demanding direction of reliability is developed, the inhibition of mechanical oscillation also increasingly has must
It wants, different in the way of inhibition, vibration control technology can be divided into weakening, vibration isolation, absorbing, resistance vibration and dynamic design.This five
In kind vibration control technology, vibration isolation is most widely used.
Isolation mounting is that the equipment for vibrating influence is isolated between mechanical equipment and basic platform.In general, by power-equipment and
Its installation component is supported on basic platform by isolation mounting.Isolation mounting is the key that the vibration isolation efficiency for determining isolation mounting
Component.
Application No. is a kind of automobile power assembly masters of 201610534518.2 Chinese patent filed on July 7th, 2016
The structure of the driven disc and upper and lower sap cavity with inertia channel being connected with actuator proposed in dynamic control formula hydraulic mount,
Under high frequency operating condition, the structure of the automobile power assembly active control type hydraulic mount does not have the effect for offsetting vibration, and contracts
Small active force will lead to and have to increase actuator power output to meet the demand of counteracting exciting force, is able to satisfy its function
The only too long magnetostrictive actuator of longitudinal size is unable to satisfy actual installation demand so that whole device is oversized, drop
The working efficiency of low whole system.
Application No. is 201410031596.1 Chinese patent active control type engine liquids filed on January 23rd, 2014
Hydraulic suspension proposes, by " main spring, upper liquid chamber, inertia channel and the decoupling film, lower liquid chamber " of traditional passive vibration isolation device in structure " under
Liquid chamber " moves to above main spring, reverse with the upper lower liquid chamber of traditional passive vibration isolation device.Structure has the following problems: 1. by teleblem with
Rubber spring vulcanization setting forms upper liquid chamber, such setting make winner's spring under compression liquid chamber when, upper liquid chamber is also by main spring pressure
Contracting, upper lower liquid chamber pressure difference become smaller and the flow for flowing through inertia channel are caused to become smaller, and reduce inertia channel dissipation vibrational energy
Ability.2. the effective area that its structure decoupling film acts on lower liquid chamber is equal with the effective area that main spring acts on lower liquid chamber, make
It obtains actuator vibration force directly to go to offset exciting force, actuator exports force request and increases, and brings system energy consumption to increase, volume increasing
Greatly, efficiency reduces.
The master external application No. is 201710317821.1 Chinese patent voice coil actuator filed on May 18th, 2017
Dynamic control formula suspension, using " main spring, upper liquid chamber, inertia channel and decoupling film, lower liquid chamber " configuration, by decoupling film and actuator phase
Connection, actuator generation, which is used as power, is applied to decoupling film, and there are the following problems for structure: 1. its described coil brace and lower baffle
Body is by oil sealing lower chambers, i.e., there are the opposite slidings of up and down direction between voice coil motor coil bracket and lower gear plate body.Outstanding
When setting by dead load, upper and lower sap cavity pressure is larger, seal request when this structure is unable to satisfy automobilism under complex working condition.This
Kind design can make the micro- phenomenon of leakage of generation in sap cavity serious during the work time, to influence production reliability.2. decoupling film to make
Act on that upper liquid chamber effective area is very nearly the same, which will lead to vibration isolation effect for upper lower liquid chamber effective area and main spring
Rate reduces.
Above-mentioned several design schemes existing defects in sealing, vibration isolating effect, volume efficiency, limit its practical application,
Therefore one kind passive hybrid vibration isolation device of master high-efficient, small in size is developed to be of great significance.
Utility model content
The purpose of the utility model is to provide a kind of active-passive integratedization vibration isolator systems, for reducing the vibration of mechanical equipment
It is dynamic, improve precision, stability, safety, comfort and service life of mechanical equipment etc..
In order to solve the above-mentioned technical problem, the technical solution of the utility model is:
A kind of active-passive integratedization isolation mounting, including signal pickup assembly, control device and vibration absorber, the signal
Signal is simultaneously passed to the control device by the vibration signal of acquisition device collection machinery equipment, and the control device is according to signal
It controls the vibration absorber and carries out vibration damping.
The passive vibration isolation device and active vibration isolation interconnected that the vibration absorber includes shell, is arranged in the shell
Device.The passive vibration isolation device is connected with active vibration insulator by bindiny mechanism, and the bindiny mechanism uses axle sleeve, and the axle sleeve is solid
It is scheduled on the active vibration insulator, the passive vibration isolation device is fixed on the axle sleeve.The axle sleeve is fixed by fixing bolt
On the active vibration insulator, the passive vibration isolation device is fixed on the axle sleeve by fixed screw.
The passive vibration isolation device includes rubber spring and inertia channel mechanism, the inertia channel mechanism include upper disk, under
Disk, decoupling film and leather cup, the rubber spring, upper disk, lower wall, leather cup are set gradually, the upper disk and lower wall be arranged to be formed it is used
Property channel, the decoupling film is arranged between the upper disk and lower wall.The fixed screw sequentially passes through the decoupling film and skin
Bowl is fixed on the axle sleeve.
Preferably, the centre bore of centre bore and the leather cup that the fixed screw sequentially passes through the decoupling film is fixed
On the axle sleeve.
Preferably, the decoupling film upper surface, upper disk and rubber spring composition upper liquid chamber, the decoupling film lower surface,
Lower wall and leather cup constitute lower liquid chamber, upper liquid chamber and lower liquid chamber described in the inertia channel connection.
Preferably, the active vibration insulator includes the coil being wound in iron core along axial direction, the mover embedded with permanent magnet
Assembly, stator and the reed for connecting mover assembly and stator, the axle sleeve are set on the mover assembly.
Preferably, the mover assembly includes the mover flywheel of both mover outer ring, mover mandrel and connection, it is described
Axle sleeve is set on the mover mandrel.
Preferably, shell successively includes upper protective cover, base joint and lower protective cover, the rubber spring, upper disk,
Lower wall and leather cup outer are integrated by the edge punching press compression of the base joint, and the stator is pressed in by lower protective cover
On the base joint, the signal pickup assembly is arranged on the base joint.
Preferably, the decoupling film embedded metal skeleton, improves the decoupling film rigidity and guarantees decoupling film to upper and lower
Big variation does not occur in stroke range for the effective area of liquid chamber.
Preferably, outer and the centre bore edge embedded metal skeleton of the leather cup, guarantee its leakproofness.
Compared with prior art, the utility model has the advantage that the vibration when signal pickup assembly collection machinery equipment
After dynamic signal, signal is passed into the control device, the control device judges vibration frequency, when rubber spring is swashed by low frequency
When power of shaking, active-passive integratedization isolation mounting work works in Passive Mode, passive vibration isolation device, active vibration insulator not work
Make, the upper and lower liquid chamber pressure of passive vibration isolation device causes liquid to flow in inertia channel with volume change, possess particular fluid hold and
The inertia channel of liquid resistance can consume partial vibration energy, so that vibration be inhibited to transmit to pedestal.When rubber spring is swashed by medium-high frequency
When power of shaking, the work of active-passive integratedization isolation mounting generates upward in aggressive mode by control system control active vibration insulator
Active force be transferred to decoupling film, be transferred to rubber spring by upper liquid chamber amplification, rubber spring is downward anti-to pedestal one
Active force offsets therewith, so that vibration be inhibited to transmit to pedestal.The decoupling film of the integrative vibration isolation device acts on liquid up and down
The effective area of room is less than the effective area that main spring acts on upper liquid chamber, and the active force that the active vibration insulator generates is by upper
Liquid chamber is transmitted to power at rubber spring and is amplified, and reaction force is the active force applied on the base, this power is also amplified.
The active vibration insulator is applied to the active force at pedestal and is amplified in working frequency range through passive vibration isolation device, is transmitted to vibration source
The power of pedestal offsets, and improves vibration isolation efficiency.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit in any way disclosed by the utility model
Range.In addition, shape and proportional sizes of each component in figure etc. are only schematically, to be used to help the reason to the utility model
Solution is not the specific shape and proportional sizes for limiting each component of the utility model.Those skilled in the art is practical new at this
Under the introduction of type, various possible shapes and proportional sizes can be selected to implement the utility model as the case may be.Attached
In figure:
Fig. 1 is the structural schematic diagram of the active-passive integratedization isolation mounting of one specific embodiment of the utility model；
Fig. 2 is the structural schematic diagram of the active vibration insulator of one specific embodiment of the utility model.
As shown in the figure: 1- active vibration insulator, 2- rubber spring, the upper disk of 3-, 4- lower wall, 5- decouple film, 6- leather cup, 7- connection
Protective cover, 10- base joint, 11- iron core, 12- coil, 13- permanent magnet, 14- mover under the upper protective cover of part assembly, 8-, 9-
Assembly, 15- reed, 16- decoupling film metallic framework, 17- leather cup metallic framework, 18- signal pickup assembly, 20- mover outer ring,
21- mover mandrel, 22- mover flywheel, 23- axle sleeve, 24- screw.
Specific embodiment
In order to make those skilled in the art more fully understand the technical solution in the utility model, below in conjunction with this reality
With the attached drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that
The described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.Based on the utility model
In embodiment, those of ordinary skill in the art's every other implementation obtained without making creative work
The range of the utility model protection all should belong in example.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not offered as being unique embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein "and/or" includes
Any and all combinations of one or more related listed items.
Referring to Figure 1 and Fig. 2, a kind of active-passive integratedization isolation mounting, including signal pickup assembly 18, control device and
Signal is simultaneously passed to the control device by vibration absorber, the vibration signal of the 18 collection machinery equipment of signal pickup assembly,
The control device controls the vibration absorber according to signal and carries out vibration damping.
In the present embodiment, the signal pickup assembly 18 uses acceleration transducer, and acceleration transducer measurement is transmitted to
For vibration signal at pedestal as control error signal, the control device uses industrial computer, vehicle-mounted computer, microcomputer
Calculation machine, embedded computer, digital signal processor (DSP) or Programmadle logic device (FPGA) etc..
The vibration absorber includes shell, is arranged in the shell and the passive vibration isolation of the relatively described shell fixed setting
Device and active vibration insulator 1.The passive vibration isolation device and active vibration insulator 1 are connected in series.
The passive vibration isolation device and active vibration insulator 1 are attached using connector assembly 7, and the connector assembly 7 wraps
Axle sleeve 23 is included, the axle sleeve 23 is fixed on the active vibration insulator 1, and the passive vibration isolation device is fixed on the axle sleeve 23.
The shell successively includes sequentially connected upper protective cover 8, base joint 10 and lower protective cover 9, the pedestal
Connector 10 includes sequentially connected interconnecting piece and flange part, and the upper protective cover 8 connects the flange part, and using screw into
Row is fixed, and the signal pickup assembly 18 is arranged on the flange part.
The passive vibration isolation device includes rubber spring 2 and inertia channel mechanism, the inertia channel mechanism include upper disk 3,
Lower wall 4, decoupling film 5 and leather cup 6, the rubber spring 2, upper disk 3, lower wall 4, leather cup 6 are set gradually, and the rubber spring 2,
The outer of upper disk 3, lower wall 4 and leather cup 6 is pressed on the flange part.The upper disk 3 and the setting of lower wall 4 form inertia channel,
The decoupling film 5 is arranged between the upper disk 3 and lower wall 4.On the decoupling film upper surface, upper disk 3 and rubber spring 2 are constituted
Liquid chamber, the decoupling film lower surface, lower wall 4 and leather cup 6 constitute lower liquid chamber, and the inertia channel is connected to the upper liquid chamber and lower liquid
Room.The embedded decoupling film metallic framework 16 of the decoupling film 5 improves 5 rigidity of decoupling film and guarantees decoupling film 5 to upper and lower liquid
Big variation does not occur in stroke range for the effective area of room.The outer and centre bore edge of the leather cup 6 embed leather cup gold
Belong to skeleton 17, guarantees its leakproofness.
The active vibration insulator 1 includes the coil being wound in iron core 11 along axial direction, the mover assembly embedded with permanent magnet 13
14, the reed 15 of stator and connection mover assembly 14 and stator.The mover assembly 14 includes mover outer ring 20, mover mandrel
21 and connection both mover flywheel 22.In the present embodiment, the active vibration insulator 1 uses electromagnetic actuator.
The axle sleeve 23 is set on the mover mandrel 21, and passes through fixing bolt for the axle sleeve 23 and mover mandrel
21 is fixed, and the connector assembly 7 further includes screw 24, and the passive vibration isolation device sequentially passes through the solution by using screw 24
The centre bore of the centre bore of coupling film 5 and the leather cup 6 is simultaneously fixed on the axle sleeve 23, thus the passive vibration isolation device and active
Vibration isolator 1 is connected in series.The effective area that the decoupling film 5 of the integrative vibration isolation device acts on lower liquid chamber is less than rubber master
Spring 2 acts on the effective area of upper liquid chamber, and rubber spring 2 acts on upper liquid chamber effective area at least decoupling film and acts on upper liquid
2 times of room effective area, the active force that the active vibration insulator generates are transmitted to power at rubber spring 2 by upper liquid chamber and are put
Greatly, reaction force is the active force applied on the base, this power is also amplified.The active vibration insulator 1 is applied to pedestal
The active force at place is amplified in working frequency range through passive vibration isolation device, and the power for being transmitted to pedestal with vibration source offsets, improve every
Vibration efficiency.Electromagnetic actuator mover assembly 14 and leather cup 6, decoupling 5 three of film are sealed using sealing ring, and 6 junction of leather cup is servo-actuated
Sub- assembly 14 moves up and down and moves, and there is no mutual between electromagnetic actuator mover assembly 14 and leather cup 6, decoupling 5 three of film
Movement.It ensure that the good seal of lower liquid chamber.The electromagnetic actuator of use by the coil that is wound in along axial direction in iron core 11 with it is embedding
There are the assembly 14 of permanent magnet 13 and the composition of reed 15 of connecting assembly 14 and stator, structure is simple, at low cost.Reduce integration
Vibration isolator power consumption and volume.
The oscillation damping method of the active-passive integratedization isolation mounting, the specific steps are as follows:
When installation, the rubber spring 2 connects the pedestal, when the vibration of 18 collection machinery equipment of signal pickup assembly is believed
After number, signal is passed into the control device, the control device judges vibration frequency, when the rubber spring 2 is by low frequency
When exciting force, the active-passive integratedization isolation mounting work is in Passive Mode, and the work of passive vibration isolation device, active vibration insulator 1 is not
Work, upper and lower liquid chamber pressure cause liquid to flow in inertia channel with volume change, possess particular fluid and hold the inertia hindered with liquid
Channel can consume partial vibration energy, so that vibration be inhibited to transmit to pedestal, generate vibration isolating effect.When described rubber spring 2 by
When medium-high frequency exciting force, the active-passive integratedization isolation mounting work is in aggressive mode, passive vibration isolation device and active vibration insulator 1
It works, active vibration insulator 1, which is powered, generates alternation active force, this power acts on decoupling film 5, since decoupling film 5 acts on upper liquid
Room area is less than the rubber spring 2 and acts on upper liquid chamber area, and the rubber spring 2 is amplified to the power of pedestal, with transmitting
Vibration force offset, thus inhibit vibration to pedestal transmit, generate vibration isolating effect, that is to say, that active vibration insulator 1 transmit
Power is eventually transferred on pedestal by liquid chamber amplification, is offseted with the vibration force being transmitted on pedestal.For example, acting on the rubber
A upward exciting force on the main spring 2 of glue, it is upward vibration force that this power, which is transferred to pedestal also by the rubber spring 2,.Base
Acceleration transducer at seat perceives vibration, also generates upward active force by control device control active vibration insulator 1 and passes
It is handed to decoupling film 5, is transferred to the rubber spring 2 by upper liquid chamber amplification, the rubber spring 2 is downward anti-to pedestal one
Active force offsets therewith, so that vibration be inhibited to transmit to pedestal.
The control method that the control device uses is FxLMS algorithm.The collected vibration acceleration of acceleration transducer
Signal is error signal e (k), and obtaining the vibration acceleration signal at vibration source is reference signal x (k), extracts simultaneously sample reference letter
Number x (k) is inputted a transversal filter w (n) in control device, obtain filtered signal u (k)=x (k) × w (k) ×
T；U (k) is exported from controller, and by secondary channel S (z), (secondary channel includes power amplifier, electromagnetic actuator, electromagnetism work
The transmission function of device power output vibration force at pedestal is moved, vibration force transmission function of acceleration etc. at pedestal is all at pedestal
Link), it is transferred to pedestal active force acceleration signal y (k)=u (k) × S (z).This active force acceleration signal and exciting force exist
The vibration acceleration d (k) excited at pedestal is superimposed to obtain vibration acceleration signal e (k) at true pedestal.Controlling purpose is
By updating the weight of transversal filter w (n), so that error signal e (k) is 0.It is achieved in that reference signal x (k) is logical
Enter reference signal after secondary channel S (z) is filteredRecycle signalWith error signal e
(k), pass through right value update formulaWeight is updated, wherein μ is convergence factor, control
Transversal filter weight convergence speed.The active-passive integratedization isolation mounting being integrally formed vibration isolation together with FxLMS algorithm
Device system reaches the active control to vibration.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
It states, many embodiments and many applications except provided example all will be apparent for a person skilled in the art
's.Therefore, the range of this introduction should not be determined referring to foregoing description, but should referring to preceding claims and these
The full scope of the equivalent that claim is possessed determines.For comprehensive purpose, all articles and with reference to including patent
The disclosure of application and bulletin is all by reference to being incorporated herein.Appointing for theme disclosed herein is omitted in preceding claims
Where face is not intended to abandon the body matter, also should not be considered as applicant and the theme is not thought of as to disclosed reality
With a part of novel theme.
Claims (7)
1. a kind of active-passive integratedization vibration isolator system, including signal pickup assembly, control device and vibration absorber, the signal
Signal is simultaneously passed to the control device by the vibration signal of acquisition device collection machinery equipment, and the control device is according to signal
It controls the vibration absorber and carries out vibration damping, which is characterized in that the vibration absorber includes shell, is arranged in the shell and phase
To the passive vibration isolation device and active vibration insulator of shell fixed setting, the passive vibration isolation device and active vibration insulator series connection connect
It connecing, the passive vibration isolation device and active vibration insulator are attached using axle sleeve, and the axle sleeve is fixed on the active vibration insulator,
The passive vibration isolation device is fixed on the axle sleeve.
2. active-passive integratedization vibration isolator system according to claim 1, which is characterized in that the shell successively include according to
Upper protective cover, base joint and the lower protective cover of secondary connection, the base joint include sequentially connected interconnecting piece and convex
Edge, the upper protective cover connect the flange part, and the signal pickup assembly is arranged on the flange part.
3. active-passive integratedization vibration isolator system according to claim 2, which is characterized in that the passive vibration isolation device includes
Rubber spring and inertia channel mechanism, the inertia channel mechanism include upper disk, lower wall, decoupling film and leather cup, the rubber master
Spring, upper disk, lower wall, leather cup are set gradually, and the outer of the rubber spring, upper disk, lower wall, leather cup is pressed on the flange part
On, the upper disk and lower wall are arranged to form inertia channel, and the decoupling film is arranged between the upper disk and lower wall, described passive
Vibration isolator is fixed on the axle sleeve by sequentially passing through the fixed screw of the decoupling film and leather cup.
4. active-passive integratedization vibration isolator system according to claim 3, which is characterized in that the decoupling film upper surface,
Upper disk and rubber spring constitute upper liquid chamber, and the decoupling film lower surface, lower wall and leather cup constitute lower liquid chamber, and the inertia channel connects
Lead to the upper liquid chamber and lower liquid chamber.
5. active-passive integratedization vibration isolator system according to claim 3, which is characterized in that the decoupling film embedded metal
Skeleton.
6. active-passive integratedization vibration isolator system according to claim 2, which is characterized in that the active vibration insulator includes
The coil in iron core, the mover assembly embedded with permanent magnet, stator and the spring for connecting mover assembly and stator are wound in along axial direction
Piece, the stator are pressed on the base joint by the lower protective cover, and the axle sleeve is set on the mover assembly.
7. active-passive integratedization vibration isolator system according to claim 6, which is characterized in that the mover assembly includes dynamic
The mover flywheel of both sub- outer ring, mover mandrel and connection, the axle sleeve are set on the mover mandrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821514886.1U CN209100561U (en) | 2018-09-17 | 2018-09-17 | Active-passive integratedization vibration isolator system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821514886.1U CN209100561U (en) | 2018-09-17 | 2018-09-17 | Active-passive integratedization vibration isolator system |
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| Publication Number | Publication Date |
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| CN209100561U true CN209100561U (en) | 2019-07-12 |
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| CN201821514886.1U Active CN209100561U (en) | 2018-09-17 | 2018-09-17 | Active-passive integratedization vibration isolator system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108999925A (en) * | 2018-09-17 | 2018-12-14 | 中科振声（苏州）电子科技有限公司 | Active-passive integratedization vibration isolator system |
| PL442352A1 (en) * | 2022-09-24 | 2024-03-25 | Kfb Acoustics Spółka Z Ograniczoną Odpowiedzialnością | Passive-active silencer for reducing noise in ducts |
-
2018
- 2018-09-17 CN CN201821514886.1U patent/CN209100561U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108999925A (en) * | 2018-09-17 | 2018-12-14 | 中科振声（苏州）电子科技有限公司 | Active-passive integratedization vibration isolator system |
| CN108999925B (en) * | 2018-09-17 | 2024-10-11 | 中科振声（苏州）电子科技有限公司 | Active and passive integrated vibration isolator system |
| PL442352A1 (en) * | 2022-09-24 | 2024-03-25 | Kfb Acoustics Spółka Z Ograniczoną Odpowiedzialnością | Passive-active silencer for reducing noise in ducts |
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