CN110116601A - A kind of air-conditioning duct silencer - Google Patents
A kind of air-conditioning duct silencer Download PDFInfo
- Publication number
- CN110116601A CN110116601A CN201810119027.0A CN201810119027A CN110116601A CN 110116601 A CN110116601 A CN 110116601A CN 201810119027 A CN201810119027 A CN 201810119027A CN 110116601 A CN110116601 A CN 110116601A
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- air
- conditioning duct
- hush tube
- length
- control mechanism
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H1/00557—Details of ducts or cables
- B60H1/00564—Details of ducts or cables of air ducts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H2001/006—Noise reduction
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention relates to a kind of air-conditioning duct silencers comprising: the hush tube being connected in air-conditioning duct, caliber is greater than the caliber of air-conditioning duct and length is adjustable；For adjusting the control mechanism of the length of hush tube；For detecting the temperature sensor of the coolant media temperature in air-conditioning duct；Controller is connect with temperature sensor and control mechanism signal respectively, for determining the length of hush tube according to coolant media temperature, and passes through the length of control mechanism adjusting hush tube.The air-conditioning duct silencer, the length of hush tube is adjusted according to noise frequency in real time, so that the frequency of noise elimination of silencer coincide in real time with practical air-conditioning duct noise frequency, it is ensured that noise elimination effect.
Description
Technical field
The present invention relates to technical field of vehicle, and in particular to a kind of air-conditioning duct silencer.
Background technique
With the raising of the level of consumption, automobile gradually becomes walking-replacing tool, and for the comfort for improving occupant, auto NVH (is made an uproar
Sound, vibration and sound vibration roughness) performance is gradually taken seriously.Simultaneously with the development of NVH control technology, noise control in car hold
In reduced levels, so that the lesser noise of sound source power highlights, such as air-conditioning duct noise, generated basic reason exists
The air-conditioning duct pressure fluctuation caused by compressor cycle sex work, pressure fluctuation are transferred in cabin by pipeline, pipe clamp, vehicle body
And cause noise, though the small abnormal sound that generates of sound pressure level influences the comfort of occupant.Such noise is due to compressor cycle
Work causes, it is impossible to avoid completely.
For above-mentioned air-conditioning duct noise, existing solution has: (1) rubber hose being arranged in pipeline and reduce pipeline
Pressure fluctuation；(2) increase rubber pad at pipe clamp, reduce the vibration for being transferred to vehicle body；(3) pipeline is arranged internal or external
Silencer is to reduce loine pressure pulsation.Wherein pipeline is arranged external expansion cavate silencer and applies as extensive.It introduces and eliminates the noise
The variation of pipeline section product causes the change of acoustic impedance after device, and when acoustic impedance changes, the incident acoustic wave of certain frequencies will receive obstruction,
A part of sound wave is reflected back, and reduces loine pressure pulsation, to achieve the purpose that noise elimination.
Designed expansion cavate silencer is as shown in Figure 1, the diameter D of the expansion cavity in hush tube 02 is big in the prior art
In the diameter d of air-conditioning duct 01.The length l (length of expansion cavity) of the hush tube 02 is according to noise frequency f and following formula
It determines:
Wherein, c is the velocity of sound, and n is natural constant, and theoretically the acoustic attenuation performance curve of silencer is with the periodically bent of frequency
Line.When being designed to expansion cavate silencer, often think that velocity of sound c is fixed value, and is the air-conditioning of f for noise frequency
Pipeline 01 obtains the length l of determining expansion cavity.But velocity of sound c is the variable varied with temperature, in real work, coolant media temperature
Degree changes with the variation of air conditioner load, therefore the frequency of noise elimination of silencer is constantly changing, and practical pipeline noise frequency
Rate f is basically unchanged, therefore the frequency of noise elimination of silencer can not coincide in real time with practical air-conditioning duct noise frequency f, lead
It causes noise elimination effect undesirable, and then influences the comfort of occupant.
Therefore, how to overcome the influence of coolant media temperature change, improve silencer and the noise elimination of air-conditioning duct noise is imitated
Fruit guarantees that the comfort of occupant is those skilled in the art's technical issues that need to address.
Summary of the invention
The present invention provides a kind of air-conditioning duct silencer, adjusts the length of hush tube in real time according to noise frequency, so that disappearing
The frequency of noise elimination of sound device coincide in real time with practical air-conditioning duct noise frequency, it is ensured that noise elimination effect.
In order to solve the above technical problems, air-conditioning duct silencer provided by the present invention includes: to be connected to the air-conditioner pipe
Hush tube in road, caliber is greater than the caliber of the air-conditioning duct and length is adjustable；For adjusting the length of the hush tube
Control mechanism；For detecting the temperature sensor of the coolant media temperature in the air-conditioning duct；Controller, respectively with it is described
Temperature sensor is connected with the control mechanism signal, for determining the length of the hush tube according to the coolant media temperature
It spends, and adjusts the length of the hush tube by the control mechanism.
Hush tube is connected in air-conditioning duct, since its caliber is big compared to the caliber of air-conditioning duct, i.e., inside it
The diameter of expansion cavity is larger relative to the caliber of air-conditioning duct, so that the pipeline section product of air-conditioning duct changes, Jin Eryin
The change of acoustic impedance is played, and when acoustic impedance changes, the incident acoustic wave of certain frequencies will receive obstruction, and a part of sound wave is reflected
Back, reduce the pressure fluctuation of air-conditioning duct, to achieve the purpose that noise elimination.
The noise frequency f of air-conditioning duct and length l (i.e. the length of hush tube) relationship of expansion cavity are as follows:
Wherein, c is the velocity of sound, related to coolant media temperature, and n is natural number.Since the noise frequency f of air-conditioning duct is base
This is constant, therefore, for air-conditioning duct noise frequency f it is certain in the case where, hush tube can get by above-mentioned formula
The corresponding relationship of length l and coolant media temperature, and in actual operation, also want the influence factors such as combination pressure loss to determine
The final lengths of hush tube.
Specifically, carrying out coolant media temperature when NVH is looked after and guided in the air conditioning subsystem according to automobile research process and disappearing
The calibration of sound pipe length l obtains refrigerant most suitable noise elimination length of tube l relationship at different temperatures, and writes as control strategy
Enter controller.In real work, controller receives the coolant media temperature signal in the air-conditioning duct of temperature sensor transmission, root
Hush tube is adjusted to most suitable length l, to obtain best noise elimination effect according to above-mentioned control strategy and by control mechanism.
When the coolant media temperature in air-conditioning duct is constant, the air-conditioning duct silencer and common expansion cavate are eliminated the noise
Device is identical, and the length l of hush tube is constant to can be realized the effect for eliminating loine pressure pulsation reduction pipeline noise.And air-conditioning duct
When interior coolant media temperature changes with factors such as thermic loads inside member cabin, temperature sensor is in real time in air-conditioning duct
Coolant media temperature detected, controller passes through the length l that control mechanism adjusts hush tube in real time according to testing result, i.e.,
The length l of hush tube changes with the variation of coolant media temperature, and the two is according to control strategy real-time matching, it is ensured that silencer
Frequency of noise elimination and the noise frequency of air-conditioning duct coincide in real time, guarantee noise elimination effect, improve the comfort of member.
Optionally, in the both ends of the hush tube, at least one end is connect with hose.
Optionally, the hush tube is equipped with connector towards one end of the hose, and the control mechanism acts on described
Connector is to adjust the length of the hush tube.
Optionally, the control mechanism includes actuator and regulating part, and the actuator is connected with the controller signals,
And the regulating part can be driven to act on the connector to adjust the length of the hush tube.
Optionally, an end towards the hose of the hush tube is at mobile terminal, and by connector with it is described
Regulating part cooperation, the other end form fixing end, and opposite compressor is fixed.
Optionally, the actuator is motor, and the regulating part is screw rod, the connector of the mobile terminal be equipped with it is described
The compatible threaded hole of screw rod, screw rod described in the motor driven are rotated along the threaded hole to adjust the mobile terminal and move
It is dynamic.
Optionally, the fixing end is connect with hard tube.
Optionally, the hush tube is connected in the air inlet pipeline of compressor, the pipeline connection of one end and evaporator, separately
One end is connected to the air inlet of compressor.
Optionally, the hush tube is bellows.
Optionally, the controller is integrated in the electronic control unit of vehicle.
Optionally, the material of the hush tube is metal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of air-conditioning duct silencer in the prior art；
Fig. 2 is the structural schematic diagram of air-conditioning duct silencer provided by the embodiment of the present invention.
In attached drawing 1, the reference numerals are as follows:
01- air-conditioning duct；02- hush tube.
In attached drawing 2, the reference numerals are as follows:
1- hush tube, the mobile terminal 11-, 12- fixing end；
2- temperature sensor；
3- control mechanism, 31- motor, 32- screw rod；
4- controller；
5- air-conditioning duct；
6- connector.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand technical solution of the present invention
Applying example, the present invention is described in further detail.
Referring to FIG. 2, the structural schematic diagram of air-conditioning duct silencer provided by the embodiment of the present invention.
The embodiment of the invention provides a kind of 5 silencers of air-conditioning duct, as shown in Fig. 2, 5 silencer of air-conditioning duct includes
Hush tube 1, control mechanism 3, temperature sensor 2 and controller 4.Wherein, hush tube 1 is connected in air-conditioning duct 5, caliber D
(diameter of expansion cavity) is greater than the caliber d of air-conditioning duct 5 and length is adjustable, and control mechanism 3 is used to adjust the length l of hush tube 1
(length of the expansion cavity i.e. in hush tube 1 is adjustable), temperature sensor 2 are used to detect the coolant media temperature in air-conditioning duct 5,
Controller 4 is connect with temperature sensor 2 and 3 signal of control mechanism respectively, for determining hush tube 1 according to coolant media temperature
Length, and pass through the length of the adjusting hush tube 1 of control mechanism 3.
Hush tube 1 is connected in air-conditioning duct 5, since its caliber D is big compared to the caliber d of air-conditioning duct 5, i.e., in it
The diameter of the expansion cavity in portion is larger relative to the caliber of air-conditioning duct 5, so that the pipeline section product of air-conditioning duct 5 changes,
And then cause the change of acoustic impedance, and when acoustic impedance changes, the incident acoustic wave of certain frequencies will receive obstruction, a part of sound wave
It is reflected back, reduces the pressure fluctuation of air-conditioning duct 5, to achieve the purpose that noise elimination.
The noise frequency f of air-conditioning duct 5 and length l (i.e. the length of expansion cavity) relationship of hush tube 1 are as follows:
Wherein, c is the velocity of sound, related to coolant media temperature, and n is natural number.Since the noise frequency f of air-conditioning duct 5 is
Be basically unchanged, therefore, for air-conditioning duct 5 noise frequency f it is certain in the case where, hush tube can get by above-mentioned formula
1 length l and the corresponding relationship of coolant media temperature, and in actual operation, also want the influence factors such as combination pressure loss
Determine the final lengths of hush tube 1.
Specifically, carrying out coolant media temperature when NVH is looked after and guided in the air conditioning subsystem according to automobile research process and disappearing
The calibration of 1 length l of sound pipe obtains refrigerant most suitable 1 length l relationship of hush tube at different temperatures, and as control strategy
Writing controller 4.In real work, controller 4 receives the coolant media temperature in the air-conditioning duct 5 that temperature sensor 2 transmits
Signal adjusts hush tube 1 to most suitable length l, to obtain best eliminate the noise according to above-mentioned control strategy and by control mechanism 3
Effect.
When the coolant media temperature in air-conditioning duct 5 is constant, which disappears with common expansion cavate
Sound device is identical, and the length l of hush tube 1 is constant to can be realized the effect for eliminating loine pressure pulsation reduction pipeline noise.And air-conditioning
When coolant media temperature in pipeline 5 changes with factors such as thermic loads inside member cabin, temperature sensor 2 is in real time to air-conditioning
Coolant media temperature in pipeline 5 is detected, and controller 4 adjusts hush tube 1 by control mechanism 3 according to testing result in real time
Length l, i.e. the length l of hush tube 1 changes with the variation of coolant media temperature, the two according to control strategy real-time matching,
It can guarantee that the noise frequency of the frequency of noise elimination and air-conditioning duct 5 of silencer coincide in real time, guarantee noise elimination effect, improve relaxing for member
Adaptive.
Hush tube 1 is connected in air-conditioning duct 5, and both ends at least one end is connect with hose (not shown), wherein soft
Pipe can be stainless steel flexible hose, metal hose, corrugated flexible hose or rubber hose etc., so as to the structure of air-conditioning duct 5 not
In the case where change, enough spaces are provided for the length adjustment to the hush tube 1 by stretching for hose.That is, this disappears
Sound pipe 1 can be one end and connect with hose, and control mechanism 3 adjusts hush tube 1 to hose end (referring to one end towards hose) at this time
It is mobile, it is also possible to both ends and is connect with hose, it is mobile or same to any one end that hush tube 1 is adjusted in control mechanism 3 at this time
When it is mobile to both ends.
It is additionally provided with connector 6 in the hose end of hush tube 1, control mechanism 3 acts on the connector 6 to realize to the noise elimination
The adjusting of the length of pipe 1.Certainly, which can also directly act on hush tube 1, achieve length variation movement.
The setting of connector 6 be more convenient for control mechanism 3 realize its regulatory function.In the present embodiment, not to the specific structure of connector 6
It is limited, can be set to be connected to the end of hush tube 1 and radially outwardly extending extension board, can also be set
It is set to the connecting rod for being connected to the hose end of hush tube 1, as long as regulating part can be by cooperating the end for making it drive hush tube 1 with it
It moves in portion.
In the above-described embodiments, control mechanism 3 includes actuator and regulating part, wherein actuator and 4 signal of controller connect
Connect, and be drivingly connected with regulating part, i.e. actuator connects the regulating command of controller 4, and drive regulating part act on connector 6 with
Adjust the length of hush tube 1.
In the both ends of hush tube 1, one end is mobile terminal 11, and the other end is fixing end 12, and mobile terminal 11 is hose end, is led to
It crosses connector 6 and above-mentioned regulating part cooperates, and fixing end 12 is fixed with respect to compressor.Fixing end 12 can connect and lead to hose
It crosses the equal components of connector 6 and realizes fixation, can also realize fixation by connecting with hard tube, wherein realize admittedly by hard tube connection
Fixed mode is relatively simple, without adding other components such as connector 6, can simplify overall structure.
At this point, above-mentioned actuator is selected as motor 31, regulating part is selected as screw rod 32, the connector 6 matched with regulating part
Equipped with threaded hole compatible with screw rod 32, since the position of motor 31 and screw rod 32 is fixed, and the position of fixing end 12 is not
Become, therefore, motor 31 during rotating in threaded hole, can pass through the cooperation of screw rod 32 and threaded hole in driving screw rod 32
It drives the connector 6 of mobile terminal 11 mobile, and then realizes the adjusting of the length of hush tube 1.
In the present embodiment, with no restrictions to the specific location of motor 31, as long as it can drive screw rod 32 to realize to noise elimination
The adjusting of the mobile terminal 11 of pipe 1.As shown in Fig. 2, motor 31 is set to when the both ends of hush tube 1 are equipped with connector 6
12 side of fixing end, wherein the connector 6 of mobile terminal 11 is equipped with threaded hole, and the connector 6 of fixing end 12 is equipped with through-hole, spiral shell
Bar 32 passes through through-hole and threaded hole cooperates.
It is of course also possible to which motor 31 is set to 11 side of mobile terminal, spiral shell of the screw rod 32 directly with the connector 6 of mobile terminal 11
Pit cooperation.Alternatively, when the both ends of the hush tube 1 are mobile terminal 11, motor 31 can be also set to two connectors 6 it
Between, while two connectors 6 are driven, to realize the adjusting to 1 length of hush tube.The specific location of motor 31 can basis
Concrete structure design and applying working condition are set.
In addition, in the above-described embodiments, which can be also also selected as to hydraulic cylinder, regulating part is selected as push-pull rod,
The connector 6 of the connection of the piston rod of one end and hydraulic cylinder, the other end and mobile terminal connects, and hydraulic cylinder driving push-pull rod simultaneously leads to
Cross adjusting of the realization of connector 6 to the length of hush tube 1.
Due to 5 noise of air-conditioning duct mainly due to caused by compressor cycle sex work, in the present embodiment,
The hush tube 1 is connected in the air inlet pipeline of compressor, the pipeline connection of one end and evaporator, the other end and compressor
Air inlet connection.Wherein, which can also pass through hose and compression by the pipeline connection of hose and evaporator
The air inlet of machine be connected to or hush tube 1 with connect by hose therebetween.When hush tube 1 and compressor and evaporator
Between when being connected by hose, mobile terminal 11 can be one end towards compressor, can also be by towards evaporator
One end or both ends are mobile terminals 11.Hush tube 1 is set in the air inlet pipe of compressor, relative to set on other positions
For, it is more preferable for the silencing noise effect of air-conditioning duct 5.
In the above-described embodiments, hush tube 1 is set as bellows, facilitates realization length adjustment, and adjusting its length
During, which can guarantee that the internal diameter (i.e. the diameter of expansion cavity) of the hush tube 1 is constant.Certainly, which can also
To select the stretching structure of at least two sections, i.e. the outside that a section is sheathed on another section can pass through the axially opposing position of both adjustings
The variation of total length is realized in the sliding set.But it is by a relatively simple using the design of the structure of bellows, good economy performance and it is easy to real
It is existing.
In the above-described embodiments, controller 4 is integrated in ECU (electronic control unit of vehicle), simplifies overall structure,
And it is easily controllable.
In the above-described embodiments, the material of hush tube 1 is selected as metal, since the hush tube 1 is connected to air-conditioning duct 5
In, inside have refrigerant circulation, therefore, metal setting hush tube 1 can make it have certain high temperature resistant, high pressure resistant, corrosion resistant
The excellent performances such as erosion and shock resistance, guarantee its service life.Certainly, which can also select other with such excellent
The material of performance.
The above is only the preferred embodiment of the present invention, it is noted that those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (11)
1. a kind of air-conditioning duct silencer characterized by comprising
The hush tube (1) being connected in the air-conditioning duct (5), caliber are greater than the caliber and length of the air-conditioning duct (5)
It is adjustable；
For adjusting the control mechanism (3) of the length of the hush tube (1)；
For detecting the temperature sensor (2) of the coolant media temperature in the air-conditioning duct (5)；
Controller (4) is connect with the temperature sensor (2) and the control mechanism (3) signal respectively, for according to described cold
Medium temperature determines the length of the hush tube (1), and the length of the hush tube (1) is adjusted by the control mechanism (3)
Degree.
2. air-conditioning duct silencer according to claim 1, which is characterized in that in the both ends of the hush tube (1), at least
One end is connect with hose.
3. air-conditioning duct silencer according to claim 2, which is characterized in that the hush tube (1) is towards the hose
One end be equipped with connector (6), the control mechanism (3) acts on the connector (6) to adjust the length of the hush tube (1)
Degree.
4. air-conditioning duct silencer according to claim 3, which is characterized in that the control mechanism (3) includes actuator
And regulating part, the actuator are connected with the controller (4) signal, and the regulating part can be driven to act on the connector
(6) to adjust the length of the hush tube (1).
5. air-conditioning duct silencer according to claim 4, which is characterized in that one of the hush tube (1) is towards institute
The end of hose is stated at mobile terminal (11), and is cooperated by connector (6) and the regulating part, the other end forms fixing end
(12), opposite compressor is fixed.
6. air-conditioning duct silencer according to claim 5, which is characterized in that the actuator is motor (31), described
Regulating part is screw rod (32), and the connector (6) of the mobile terminal (11) is equipped with the screw rod (32) compatible threaded hole, institute
Stating motor (31) drives the screw rod (32) to rotate along the threaded hole to adjust the mobile terminal (11) movement.
7. air-conditioning duct silencer according to claim 6, which is characterized in that the fixing end (12) connect with hard tube.
8. air-conditioning duct silencer according to claim 1-6, which is characterized in that hush tube (1) connection
In the air inlet pipeline of compressor, the pipeline connection of one end and evaporator, the other end is connected to the air inlet of compressor.
9. air-conditioning duct silencer according to claim 1-6, which is characterized in that the hush tube (1) is wave
Line pipe.
10. air-conditioning duct silencer according to claim 1-6, which is characterized in that the controller (4) is integrated
In in the electronic control unit of vehicle.
11. air-conditioning duct silencer according to claim 1-6, which is characterized in that the material of the hush tube (1)
Matter is metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119027.0A CN110116601B (en) | 2018-02-06 | 2018-02-06 | Air conditioner pipeline silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119027.0A CN110116601B (en) | 2018-02-06 | 2018-02-06 | Air conditioner pipeline silencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110116601A true CN110116601A (en) | 2019-08-13 |
| CN110116601B CN110116601B (en) | 2022-04-05 |
Family
ID=67519434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810119027.0A Active CN110116601B (en) | 2018-02-06 | 2018-02-06 | Air conditioner pipeline silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110116601B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110925514A (en) * | 2019-12-20 | 2020-03-27 | 上海核工程研究设计院有限公司 | Device for avoiding piping system acoustic resonance |
| CN113701873A (en) * | 2020-05-19 | 2021-11-26 | 广州汽车集团股份有限公司 | Refrigerant flow sound detection device, system and method |
| CN114215669A (en) * | 2021-12-24 | 2022-03-22 | 安徽江淮汽车集团股份有限公司 | Method for eliminating air inlet broadband noise and expansion cavity structure |
| CN114837915A (en) * | 2021-02-02 | 2022-08-02 | 北京亿华通科技股份有限公司 | Air inlet pipeline and air inlet method of air compressor, fuel cell system and vehicle |
| WO2023098246A1 (en) * | 2021-12-02 | 2023-06-08 | 青岛海尔空调器有限总公司 | Air conditioner pipeline noise control system and air conditioner |
| WO2024051179A1 (en) * | 2022-09-08 | 2024-03-14 | 青岛海尔空调器有限总公司 | Muffler parameter determination method and apparatus, device, storage medium, and system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925514A (en) * | 2019-12-20 | 2020-03-27 | 上海核工程研究设计院有限公司 | Device for avoiding piping system acoustic resonance |
| CN110925514B (en) * | 2019-12-20 | 2022-05-10 | 上海核工程研究设计院有限公司 | Device for avoiding piping system acoustic resonance |
| CN113701873A (en) * | 2020-05-19 | 2021-11-26 | 广州汽车集团股份有限公司 | Refrigerant flow sound detection device, system and method |
| CN114837915A (en) * | 2021-02-02 | 2022-08-02 | 北京亿华通科技股份有限公司 | Air inlet pipeline and air inlet method of air compressor, fuel cell system and vehicle |
| WO2023098246A1 (en) * | 2021-12-02 | 2023-06-08 | 青岛海尔空调器有限总公司 | Air conditioner pipeline noise control system and air conditioner |
| CN114215669A (en) * | 2021-12-24 | 2022-03-22 | 安徽江淮汽车集团股份有限公司 | Method for eliminating air inlet broadband noise and expansion cavity structure |
| WO2024051179A1 (en) * | 2022-09-08 | 2024-03-14 | 青岛海尔空调器有限总公司 | Muffler parameter determination method and apparatus, device, storage medium, and system |
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| CN110116601B (en) | 2022-04-05 |
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