CN117622340A - Cab suspension vibration damper, sound quality improving method and system and engineering machinery - Google Patents
Cab suspension vibration damper, sound quality improving method and system and engineering machinery Download PDFInfo
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- CN117622340A CN117622340A CN202311747048.4A CN202311747048A CN117622340A CN 117622340 A CN117622340 A CN 117622340A CN 202311747048 A CN202311747048 A CN 202311747048A CN 117622340 A CN117622340 A CN 117622340A
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Abstract
The invention discloses a cab suspension vibration damper, a sound quality improving method, a system and engineering machinery, wherein the cab suspension vibration damper comprises the following components: a base connected with the frame; a roof panel connected to the cab floor; the middle table top is positioned between the base and the top plate and is connected with the top plate through a plurality of magnetorheological dampers; the middle table top is connected with the base through a limiting vibration reduction assembly and a plurality of variable stiffness springs. The cab suspension vibration damper is simple in structure, good in vibration damping effect and easy to install and maintain, meanwhile, the rigidity and the damping of the cab suspension vibration damper can be adjusted in real time, the sound quality of a cab is improved, and accordingly driving comfort and accuracy of driver conversation are improved.
Description
Technical Field
The invention belongs to the technical field of sound quality control of engineering machinery, and particularly relates to a cab suspension vibration damper, a sound quality improving method and system and engineering machinery.
Background
Noise generated by the engineering vehicle during operation is an important index for influencing the fatigue degree of a driver, at present, the noise generated by most engineering mechanical products is already lower than 85dBA, when the noise beside the ear of the driver is lower than 70dBA and reaches the acceptable range of the ear, the hearing recognition effect of the ear is dominant at the moment, and the harm of the noise is converted into physiological adverse reactions of the human, such as fatigue, dizziness, limb weakness, attention and judgment decline, slow reaction, emotion dysphoria and irritability and the like. Because of the complexity of acoustic properties caused by the distribution characteristics of the noise spectrum in the vehicle, the evaluation of the noise quality cannot be completed by a single sound pressure level, and at this time, the acoustic quality parameters gradually take the dominant role, so that the improvement device and the system with the improved acoustic quality as the cut-in point become the main research direction.
At present, the engineering vehicle has not been developed to solve the device and system of the sound quality of the cab, the traditional solution is still stagnated in the times mainly for reducing the sound pressure level of the weight A, the main components influencing the weight A are generally analyzed and searched by the noise FFT (fast Fourier transform) beside the ears of the driver, the sound pressure level beside the ears of the driver is reduced by suspending the vibration reduction system of the engineering vehicle or blocking the air sound transmission gap, and the requirements of improving the sound quality and reducing the subjective annoyance degree of the ears are met, so the device and system for improving the sound quality of the cab have very important research significance in the field of engineering vehicles.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the cab suspension vibration damper, the sound quality improving method, the system and the engineering machinery, which are simple in structure, good in vibration damping effect and easy to install and maintain, and simultaneously can adjust the rigidity and the damping of the cab suspension vibration damper in real time and improve the sound quality of a cab, so that the driving comfort and the accuracy of the driver conversation are improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, there is provided a cab suspension damping device comprising: a base connected with the frame; a roof panel connected to the cab floor; the middle table top is positioned between the base and the top plate and is connected with the top plate through a plurality of magnetorheological dampers; the middle table top is connected with the base through a limiting vibration reduction assembly and a plurality of variable stiffness springs.
Further, the axis of each variable stiffness spring is perpendicular to the base and the middle table top respectively, and the included angle between the axis of each variable stiffness spring and the horizontal plane is an acute angle.
Further, at least one magneto-rheological damper is vertically arranged between the middle table top and the top plate, and the rest magneto-rheological dampers are respectively parallel to the variable stiffness springs at the corresponding installation positions.
Further, the limiting vibration reduction assembly is connected with the middle table top through a spherical hinge, and the limiting vibration reduction assembly is connected with the base through a spherical hinge.
Further, the limit vibration reduction assembly includes: an upper spherical hinge hinged with the middle table top; a lower spherical hinge hinged with the base; a spring installed between the upper ball pivot and the lower ball pivot; the upper spherical hinge is provided with a sliding rod, the lower spherical hinge is provided with a sleeve, and one end of the sliding rod, which is far away from the upper spherical hinge, extends into the sleeve and keeps a set distance with the lower spherical hinge.
Further, the spring is sleeved outside the sleeve.
Further, the sleeve includes a metal housing and a lower sleeve rubber and an upper sleeve rubber disposed on the metal housing by a vulcanization process.
Further, the diameter of the upper spherical hinge and the diameter of the lower spherical hinge are both larger than the diameter of the spring.
In a second aspect, a method for improving sound quality of a cab is provided, based on the cab suspension damping device of the first aspect, the method comprising: collecting noise signals in a cab and vibration signals of the cab; performing sound quality analysis according to the noise signal and the vibration signal, and extracting main objective parameters; when the sound quality analysis result exceeds the threshold value, the rigidity and the damping of the magneto-rheological damper in the cab suspension damping device are adjusted according to the extracted main objective parameters, or the loudspeaker arranged in the cab is controlled to play the opposite-phase sound wave of the noise signal.
Further, adjusting the stiffness and damping of the magnetorheological damper in the cab suspension damping device or controlling the speaker installed in the cab to play the inverse sound wave of the noise according to the extracted main objective parameters, comprising: when the main objective parameter is the significant rate, that is, the sound quality analysis result exceeds the threshold value, all frequencies of which the significant rate exceeds the first set value are extracted and marked as a first frequency group, and all frequencies of which the significant rate frequency exceeds the first set value in the collected vibration signals are extracted and marked as a second frequency group; when the coincidence degree of each frequency of the first frequency group and each frequency of the second frequency group exceeds a second set value, the sound quality super-threshold is considered to be caused by structural noise, the minimum frequency of the first frequency group is extracted, the suspension rigidity and damping corresponding to the minimum frequency are calculated, and a control instruction for adjusting the rigidity and damping of the magnetorheological damper in the cab suspension vibration damper is sent out in real time; when the main objective parameter is other parameters, namely the sound quality analysis result exceeds the threshold value, the parameters are caused by parameters other than the significant rate, and the loudspeaker installed in the cab is controlled to play the inverted sound wave of the noise signal.
Further, the working frequency band of the loudspeaker is 9-17Bark.
In a third aspect, a cabin sound quality enhancement system is provided, including the cabin suspension damping device of the first aspect, the system further comprising: the data acquisition module is used for acquiring noise signals in the cab and vibration signals of the cab; the vehicle-mounted main controller is used for analyzing sound quality according to the noise signals and the vibration signals and extracting main objective parameters; and the cab sound quality active control module is used for adjusting the rigidity and damping of the magneto-rheological damper in the cab suspension damping device according to the extracted main objective parameters or controlling a loudspeaker arranged in the cab to play the inverted sound wave of the noise signal when the sound quality analysis result exceeds the threshold value.
In a fourth aspect, there is provided a construction machine provided with the cabin sound quality improvement system of the third aspect.
Compared with the prior art, the invention has the beneficial effects that: the invention is through the base connected with frame; a roof panel connected to the cab floor; the middle table top is positioned between the base and the top plate and is connected with the top plate through a plurality of magneto-rheological dampers; the middle table board is connected with the base through the limiting vibration reduction assembly and the variable stiffness springs, so that the formed cab suspension vibration reduction device has the characteristics of simple structure, good vibration reduction effect, easiness in installation and maintenance and the like, and meanwhile, the rigidity and the damping of the cab suspension vibration reduction device can be adjusted in real time, the sound quality of a cab is improved, and the driving comfort and the accuracy of a driver conversation are improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a cab suspension damper provided by an embodiment of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a schematic view of the mounting structure of a variable rate spring and an intermediate platform in an embodiment of the present invention;
FIG. 4 is a schematic view of a limiting vibration damping assembly according to an embodiment of the present invention;
FIG. 5 is a schematic view of a cab with a cab acoustic quality enhancement system provided by an embodiment of the invention installed;
fig. 6 is a main flow diagram of a method for improving sound quality of a cab according to an embodiment of the present invention;
in the figure: 1. a base; 2. a variable stiffness spring; 21. -an X-up spring; 22. -an X downward spring; 23. +X upward spring; 24. +X downward spring; 25. -Y up springs; 26. -Y downward springs; 27. +Y upward spring; 28. +y downward spring; 3. a limit vibration reduction assembly; 31. a lower spherical hinge; 32. a sleeve; 321. a lower sleeve rubber; 322. an upper sleeve rubber; 33. a slide bar; 34. a spring; 35. a spherical hinge is arranged; 4. a middle table top; 5. a magnetorheological damper; 6. a top plate; 10. a cab suspension damping device; 20. a vibration sensor; 30. a vehicle-mounted main controller; 40. an error microphone; 50. and a speaker.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
as shown in fig. 1 to 4, a cab suspension vibration damping device includes: a base 1 connected with the frame; a roof panel 6 connected to the floor of the cab; the middle table top 4 is positioned between the base 1 and the top plate 6, wherein the middle table top 4 is connected with the top plate 6 through a plurality of magneto-rheological dampers 5; the middle table top 4 is connected with the base 1 through a limiting vibration reduction assembly 3 and a plurality of variable stiffness springs 2.
In this embodiment, there are eight variable rate springs 2 and five magnetorheological dampers 5. The base 1 is positioned above the frame and is connected with the frame through bolts; the stiffness-variable spring 2 is connected with the base 1 and the middle table top 4 through welding, and forms an acute angle with the horizontal plane; the limit vibration reduction assembly 3 is connected with the base 1 and the middle table top 4 through a spherical hinge; the magneto-rheological damper 5 is positioned between the middle table top 4 and the top plate 6, one is vertically positioned at the center below the top plate 6, and the other four are parallel to the corresponding positions in the variable stiffness spring 2.
As shown in fig. 3, the variable stiffness springs 2 are welded to the corresponding contact platforms. In the four directions of +X, -X, +Y and Y, two variable stiffness springs in each direction are symmetrically distributed at the upper and lower positions of the middle table top 4, and a non-90-degree included angle exists between the axis of the springs and the horizontal plane. The eight variable stiffness springs 2 specifically include: x upward spring 21, -X downward spring 22, +X upward spring 23, +X downward spring 24, -Y upward spring 25, -Y downward spring 26, +Y upward spring 27, +Y downward spring 28. The X upward spring 21 and the X downward spring 22 are positioned on the same axis, and the +X upward spring 23 and the +X downward spring 24 are coaxial, and the other two directions are the same. When the frame vibrates in the X direction, the frame drives the base 1 to move in the X direction, the +X downward spring 24 and the-X downward spring 22 are subjected to tensile force, the +X upward spring 23 and the-X upward spring 21 are subjected to compressive force, the +X oblique force of the middle table top 4 is decomposed into the X direction and the Z direction (the X direction stress is 2 times of the single spring force), the-X oblique force of the middle table top 4 is decomposed into the +X direction and the-Z direction (the X direction stress is 2 times of the single spring force), the synthesized X direction stress is 4 times of the single spring, and the Z direction stress is counteracted, so that the X direction vibration is effectively weakened.
The action principle of the four variable stiffness springs along the Y direction is consistent with that of the X direction, when the frame vibrates in the Y direction, the frame drives the base 1 to move in the Y direction, the +Y downward spring 28 and the-Y downward spring 26 are subjected to tensile force, the +Y upward spring 27 and the-Y upward spring 25 are subjected to compressive force, the force applied to the +Y inclined plane of the middle table top 4 is decomposed into the Y direction and the Z direction (the force applied to the Y direction is 2 times of the force applied to the single spring), the force applied to the-Y inclined plane of the middle table top 4 is decomposed into the +Y direction and the-Z direction (the force applied to the Y direction is 2 times of the force applied to the single spring), and the force applied to the combined Y direction is 4 times of the force applied to the single spring, and the Z direction force is counteracted, so that the Y direction vibration is effectively weakened.
As shown in fig. 4, the limiting vibration damping assembly 3 is a second vibration damping system, so that not only vibration damping in the vertical direction can be further realized, but also the second group of vibration damping systems can be ensured to play a role when the springs fail, the limiting vibration damping assembly 3 comprises a lower spherical hinge 31, and the spherical structure can enable the sleeve 32 to rotate at any angle; the sleeve 32 is formed by vulcanizing two groups of rubber with a metal shell, including a lower sleeve rubber 321 and an upper sleeve rubber 322, and the two groups of rubber can ensure that when the spring fails, the conical rubber realizes the vibration reduction in the directions of X, Y, Z; the metal slide bar 33 is positioned in the sleeve 32, and the sufficient travel distance can ensure that the slide bar 33 is not contacted with the sleeve 32 and the sleeve rubber when the spring works, and can be contacted with the rubber only when the spring assembly fails; the spring 34 is sleeved outside the sleeve 32 and welded on the spherical hinge plane, so that vibration reduction in the vertical direction is realized; the upper spherical hinge 35 is connected between the middle table top 4 and the metal slide bar 33, and the spherical hinge diameter is larger than the outer diameter of the spring 34, so that the spring 34 can be ensured to work between the upper spherical hinge 35 and the lower spherical hinge 31 all the time.
The cab suspension vibration damper has the characteristics of simple structure, good vibration damping effect, easiness in installation and maintenance and the like, and meanwhile, the rigidity and the damping of the cab suspension vibration damper can be adjusted in real time, and the sound quality of a cab is improved, so that the driving comfort and the accuracy of a driver conversation are improved.
Embodiment two:
the first embodiment provides a cab sound quality improving system based on the cab suspension damping device.
The cab acoustic quality enhancement system includes two aspects: the first is a cab suspension vibration damper according to the first embodiment of the invention for the main objective parameter significance ratio; and secondly, a cab sound quality improving system is provided aiming at other main objective parameters.
As shown in fig. 5, in the first embodiment, four cab suspension damping devices 10 are provided and symmetrically distributed between the cab floor and the frame; the vibration sensor 20 is installed at the bottom of the cab, and the in-vehicle main controller 30, the error microphone 40, and the speaker 50 are installed in the cab.
As shown in fig. 6, the main flow of the cabin sound quality improving system includes:
1. and the sound quality objective parameter modeling module is used for: the objective parameter modeling module of the sound quality carries on objective parameter analysis to the noise signal of the cab collected by the error microphone in the cab, establish the objective parameter model of the sound quality of multiple regression through subjective evaluation (belonging to the prior art), get the main objective parameter of the sound quality of the cab;
2. and a data acquisition module: the data acquisition module comprises an error microphone in the cab, a rotating speed sensor near the engine and a vibration sensor on a vibration damping base of the cab, and mainly acquires noise signals in the cab and vibration signals near the magnetorheological damper;
3. vehicle-mounted main controller: the vehicle-mounted main controller performs comprehensive comparison analysis on the noise signals and the vibration signals acquired by the data acquisition module, firstly, a real-time sound quality analysis result is obtained through a sound quality objective parameter model, and once the sound quality analysis result exceeds a threshold value, objective parameters (loudness, A weight sound pressure level, significance rate, roughness, sharpness, semantic definition, jitter degree and the like) which are mainly influenced are extracted, and objective parameters with high correlation are combined and reduced in dimension through correlation analysis; and eliminating objective parameters with small weight factors through weight analysis, and finally obtaining the objective parameter model of sound quality established by the objective parameters with the greatest influence. When the sound quality analysis result exceeds the threshold value and is caused by the saliency parameter, extracting all frequencies of which the frequencies exceed a first set value (9 dB) in the error microphone saliency analysis, marking the frequencies as a first frequency group, and extracting all frequencies of which the saliency frequencies exceed the first set value (9 dB) in the vibration signals acquired by the vibration sensor, marking the frequencies as a second frequency group; when the superposition ratio of each frequency of the first frequency group and each frequency of the second frequency group exceeds a second set value (90%), starting the cab suspension vibration damper, extracting the minimum frequency of the two groups of frequencies (if the minimum frequency can meet vibration isolation requirements according to vibration isolation theory, the vibration isolation effect of the higher frequency is better), calculating to obtain suspension rigidity and damping corresponding to the frequency, and sending out control instructions for adjusting the rigidity and damping of the magneto-rheological damper in the cab suspension vibration damper in real time, so that the sound quality of the cab is improved by reducing the remarkable rate; on the other hand, when the sound quality result exceeds the threshold value, which is caused by other objective parameters, a loudspeaker in the cab is started, and the sound quality of the cab is further improved through the inverted sound wave emitted by the loudspeaker.
4. The driving cab sound quality active control module: the cab sound quality active control module comprises an error microphone and a loudspeaker which are arranged in the cab. And (3) carrying out sound quality analysis according to the numerical value acquired by the error microphone, once the sound quality exceeds the threshold value and is caused by the exceeding of other objective parameters, operating the vehicle-mounted loudspeaker, feeding back the waveform acquired by the microphone to the loudspeaker in real time and generating reverse-phase sound waves, and further improving the sound quality of the cab through the loudspeaker, wherein the operating frequency range of the vehicle-mounted loudspeaker is 9-17Bark which is the human ear sensitive frequency range.
The sound quality improving system adopts the vibration isolation device of the invention, combines the variable stiffness spring vibration reduction assembly, the rubber vibration isolation and limiting assembly and the magneto-rheological damper, not only plays a role in primary variable stiffness vibration reduction, but also realizes a secondary rubber vibration reduction and limiting effect after the spring fails, and the variable damping magneto-rheological damper effectively reduces the resonance amplitude. The system for improving the sound quality of the cab is provided with an error microphone, a vibration sensor, a tachometer and a loudspeaker, objective parameters are timely extracted after the sound quality exceeds a threshold value, the objective parameters are matched with a vibration result in real time to adjust rigidity and damping of a vibration isolation device, and output waveforms of the loudspeaker in a proper Bark range are adjusted according to a loudness result, so that the aim of improving the sound quality of the cab is fulfilled.
The present embodiment also provides a method for improving sound quality of a cab, which is based on the cab suspension damping device according to the first embodiment, and includes:
collecting noise signals in a cab and vibration signals of the cab;
performing sound quality analysis according to the noise signal and the vibration signal, and extracting main objective parameters;
when the sound quality analysis result exceeds a threshold value, adjusting the rigidity and damping of a magneto-rheological damper in the cab suspension damping device according to the extracted main objective parameters, or controlling a loudspeaker arranged in the cab to play the opposite-phase sound wave of a noise signal, wherein the method comprises the following steps:
when the main objective parameter is the significant rate, that is, the sound quality analysis result exceeds the threshold value by the significant rate, all frequencies of which the significant rate exceeds a first set value (9 dB) are extracted and marked as a first frequency group, all frequencies of which the significant rate frequencies in the collected vibration signals exceed the first set value (9 dB) are extracted and marked as a second frequency group; when the overlap ratio of each frequency of the first frequency group and each frequency of the second frequency group exceeds a second set value (90%), the sound quality super-threshold is considered to be caused by structural noise, the minimum frequency of the first frequency group is extracted, the suspension rigidity and damping corresponding to the minimum frequency are calculated, and a control instruction for adjusting the rigidity and damping of the magnetorheological damper in the cab suspension vibration damper is sent out in real time;
when the main objective parameter is other parameters, namely the sound quality analysis result exceeds the threshold value and is caused by parameters other than the significant rate, controlling a loudspeaker arranged in the cab to play the inverted sound wave of the noise signal; the operating frequency band of the loudspeaker is 9-17Bark.
Embodiment III:
based on the cabin sound quality improving system according to the second embodiment, the present embodiment provides a construction machine configured with the cabin sound quality improving system according to the second embodiment.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (13)
1. A cab suspension damping device, comprising:
a base (1) connected with the frame;
a roof (6) connected to the floor of the cab;
the middle table top (4) is positioned between the base (1) and the top plate (6), wherein the middle table top (4) is connected with the top plate (6) through a plurality of magnetorheological dampers (5); the middle table top (4) is connected with the base (1) through a limiting vibration reduction assembly (3) and a plurality of variable stiffness springs (2).
2. The cab suspension damping device according to claim 1, characterized in that the axis of each variable stiffness spring (2) is perpendicular to the base (1) and the intermediate deck (4), respectively, and the angle between the axis of each variable stiffness spring (2) and the horizontal plane is an acute angle.
3. Cab suspension damping device according to claim 2, characterized in that at least one of the magnetorheological dampers (5) is mounted vertically between the intermediate table top (4) and the top plate (6), the remaining magnetorheological dampers (5) being respectively parallel to the variable stiffness springs (2) at the corresponding mounting locations.
4. Cab suspension damping device according to claim 1, characterized in that the limit damping assembly (3) is connected with the intermediate table top (4) by a spherical hinge, and the limit damping assembly (3) is connected with the base (1) by a spherical hinge.
5. Cab suspension damping device according to claim 4, characterized in that the limit damping assembly (3) comprises:
an upper spherical hinge (35) hinged with the middle table top (4);
a lower spherical hinge (31) hinged with the base (1);
a spring (34) mounted between the upper ball pivot (35) and the lower ball pivot (31);
the upper spherical hinge (35) is provided with a sliding rod (33), the lower spherical hinge (31) is provided with a sleeve (32), and one end of the sliding rod (33) away from the upper spherical hinge (35) stretches into the sleeve (32) and keeps a set distance with the lower spherical hinge (31).
6. The cab suspension damping device according to claim 5, characterized in that the spring (34) is sleeved outside the sleeve (32).
7. The cab suspension damping device of claim 5, wherein the sleeve (32) comprises a metal shell and a lower sleeve rubber (321) and an upper sleeve rubber (322) disposed on the metal shell by a vulcanization process.
8. The cab suspension damping device according to claim 5, characterized in that the diameter of the upper spherical hinge (35) and the diameter of the lower spherical hinge (31) are both larger than the diameter of the spring (34).
9. A method of cabin sound quality improvement, characterized in that it is based on a cabin suspension vibration damping device according to any one of claims 1-8, said method comprising:
collecting noise signals in a cab and vibration signals of the cab;
performing sound quality analysis according to the noise signal and the vibration signal, and extracting main objective parameters;
when the sound quality analysis result exceeds the threshold value, the rigidity and the damping of the magneto-rheological damper in the cab suspension damping device are adjusted according to the extracted main objective parameters, or the loudspeaker arranged in the cab is controlled to play the opposite-phase sound wave of the noise signal.
10. The method of claim 9, wherein adjusting the stiffness and damping of the magnetorheological damper in the cab suspension damping device or controlling the speaker mounted in the cab to play the anti-phase sound wave of the noise according to the extracted main objective parameters comprises:
when the main objective parameter is the significant rate, that is, the sound quality analysis result exceeds the threshold value, all frequencies of which the significant rate exceeds the first set value are extracted and marked as a first frequency group, and all frequencies of which the significant rate frequency exceeds the first set value in the collected vibration signals are extracted and marked as a second frequency group; when the coincidence degree of each frequency of the first frequency group and each frequency of the second frequency group exceeds a second set value, the sound quality super-threshold is considered to be caused by structural noise, the minimum frequency of the first frequency group is extracted, the suspension rigidity and damping corresponding to the minimum frequency are calculated, and a control instruction for adjusting the rigidity and damping of the magnetorheological damper in the cab suspension vibration damper is sent out in real time;
when the main objective parameter is other parameters, namely the sound quality analysis result exceeds the threshold value, the parameters are caused by parameters other than the significant rate, and the loudspeaker installed in the cab is controlled to play the inverted sound wave of the noise signal.
11. The method of claim 10, wherein the operating frequency band of the speaker is 9-17Bark.
12. A cabin sound quality enhancement system comprising the cabin suspension vibration damper of any one of claims 1-8, the system further comprising:
the data acquisition module is used for acquiring noise signals in the cab and vibration signals of the cab;
the vehicle-mounted main controller is used for analyzing sound quality according to the noise signals and the vibration signals and extracting main objective parameters;
and the cab sound quality active control module is used for adjusting the rigidity and damping of the magneto-rheological damper in the cab suspension damping device according to the extracted main objective parameters or controlling a loudspeaker arranged in the cab to play the inverted sound wave of the noise signal when the sound quality analysis result exceeds the threshold value.
13. A construction machine, characterized in that the construction machine is provided with the cabin sound quality improving system of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311747048.4A CN117622340A (en) | 2023-12-18 | 2023-12-18 | Cab suspension vibration damper, sound quality improving method and system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311747048.4A CN117622340A (en) | 2023-12-18 | 2023-12-18 | Cab suspension vibration damper, sound quality improving method and system and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117622340A true CN117622340A (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311747048.4A Pending CN117622340A (en) | 2023-12-18 | 2023-12-18 | Cab suspension vibration damper, sound quality improving method and system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117622340A (en) |
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2023
- 2023-12-18 CN CN202311747048.4A patent/CN117622340A/en active Pending
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