CN-121983013-A - Vibration absorbing cell, low-frequency sound insulation system and low-frequency sound insulation method

CN121983013ACN 121983013 ACN121983013 ACN 121983013ACN-121983013-A

Abstract

The application provides a vibration absorbing cell, a low-frequency sound insulation system and a low-frequency sound insulation method, wherein the vibration absorbing cell comprises a cantilever beam component, a permanent magnet and a coil, and the cantilever beam component is of a gamma-shaped structure and comprises a vertical part and a horizontal part with one end connected with the top end of the vertical part; the coil is sleeved outside the permanent magnet, the coil, the permanent magnet and the horizontal part are arranged separately, the vibration absorption center frequency of each vibration absorption cell can be adjusted under the electromagnetic action, each vibration absorption cell generates local resonance, a wider vibration absorption frequency band is formed under the mutual coupling action of each vibration absorption cell, and low-frequency noise of an engine at a corresponding order is absorbed in real time so as to improve the low-frequency sound insulation effect.

Inventors

DAI WEIWEI
LIU RUIJUN
WANG ZHIGANG
DUAN WEI

Assignees

重庆小康动力有限公司

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (11)

1. The vibration absorbing cell is characterized by comprising a cantilever beam component, a permanent magnet and a coil; the cantilever beam component is of a gamma-shaped structure and comprises a vertical part and a horizontal part, wherein one end of the horizontal part is connected with the top end of the vertical part; The permanent magnet is arranged at the other end of the horizontal part, and is parallel and opposite to the vertical part; The coil is sleeved outside the permanent magnet, and the coil, the permanent magnet and the horizontal part are arranged in a separated mode.
2. The shock absorbing cell of claim 1, wherein the cantilever beam assembly comprises a metal layer and damping layers disposed on both side surfaces of the metal layer.
3. A low frequency sound insulation system comprising a control module and an acoustic superstructure array disposed on a vehicle body panel, the acoustic superstructure array comprising a plurality of shock absorbing cell-sets of claim 1 or 2; The coil of the vibration absorbing unit cell is fixedly arranged on the vehicle body panel and is configured to be connected with a control module; The bottom of the vertical part of the vibration absorbing unit cell is vertical to the surface of the vehicle body panel and fixedly connected with the surface of the vehicle body panel.
4. A method of low frequency sound insulation for use in the control module of the low frequency sound insulation system of claim 3, the method comprising: acquiring the rotating speed data of an engine in real time; determining the excitation frequency of the engine at each stage according to the rotating speed data; generating electromagnetic stiffness control signals corresponding to each step according to the excitation frequency of the engine at each step; Sending electromagnetic rigidity control signals corresponding to each order to each vibration absorbing cell in the vibration absorbing cell group corresponding to each order, so that each vibration absorbing cell can adjust the vibration absorbing center frequency under the action of the electromagnetic rigidity control signals, and enable each vibration absorbing cell to generate local resonance and absorb low-frequency noise of an engine in the corresponding order in real time.
5. The method of claim 4, wherein generating the electromagnetic stiffness control signal for each stage based on the excitation frequency of the engine at each stage comprises: and generating electromagnetic stiffness control signals corresponding to each order in real time according to the excitation frequency of the engine at each order and the attribute parameters of the vibration absorbing cell group corresponding to each order.
6. The method of claim 5, wherein the property parameters of the set of shock absorbing cells include an effective mass of the cantilever beam assembly and a stiffness of the cantilever beam assembly of each shock absorbing cell in the set of shock absorbing cells; generating electromagnetic stiffness control signals corresponding to each order in real time according to the excitation frequency of the engine at each order and the attribute parameters of the vibration absorbing cell group corresponding to each order, wherein the electromagnetic stiffness control signals comprise: determining target electromagnetic rigidity of each vibration absorbing cell in each vibration absorbing cell group corresponding to each order according to the excitation frequency of the engine in each order, the effective mass of the cantilever beam component of each vibration absorbing cell in each vibration absorbing cell group corresponding to each order and the rigidity of the cantilever beam component; And generating electromagnetic stiffness control signals corresponding to the steps in real time according to the target electromagnetic stiffness of each vibration absorbing cell in the vibration absorbing cell group corresponding to the steps.
7. The method of claim 6, wherein determining the target electromagnetic stiffness of each shock-absorbing cell in the set of shock-absorbing cells corresponding to each order based on the excitation frequency of the engine at each order, the effective mass of the cantilever beam assembly of each shock-absorbing cell in the set of shock-absorbing cells corresponding to each order, and the stiffness of the cantilever beam assembly, comprises: Determining target electromagnetic rigidity of each vibration absorbing cell in the vibration absorbing cell group corresponding to the second-order excitation frequency according to the second-order excitation frequency of the engine, the effective mass of the cantilever beam component of each vibration absorbing cell in the vibration absorbing cell group corresponding to the second-order excitation frequency and the rigidity of the cantilever beam component; Determining target electromagnetic rigidity of each vibration absorbing cell in the vibration absorbing cell group corresponding to the fourth-order excitation frequency according to the fourth-order excitation frequency of the engine, the effective mass of the cantilever beam component of each vibration absorbing cell in the vibration absorbing cell group corresponding to the fourth-order excitation frequency and the rigidity of the cantilever beam component; and determining the target electromagnetic rigidity of each vibration absorbing cell in the vibration absorbing cell group corresponding to the sixth-order excitation frequency according to the sixth-order excitation frequency of the engine, the effective mass of the cantilever beam component of each vibration absorbing cell in the vibration absorbing cell group corresponding to the sixth-order excitation frequency and the rigidity of the cantilever beam component.
8. The method of claim 7, wherein determining the target electromagnetic stiffness of each of the set of vibration absorbing cells corresponding to the second order excitation frequency based on the second order excitation frequency of the engine, the effective mass of the cantilever beam assembly of each of the set of vibration absorbing cells corresponding to the second order excitation frequency, and the stiffness of the cantilever beam assembly, comprises: And taking the second-order excitation frequency of the engine as the target vibration absorption center frequency of each vibration absorption cell in the vibration absorption cell group corresponding to the second-order excitation frequency, and determining the target electromagnetic rigidity of each vibration absorption cell in the vibration absorption cell group corresponding to the second-order excitation frequency according to the target vibration absorption center frequency of each vibration absorption cell in the vibration absorption cell group corresponding to the second-order excitation frequency, the effective mass of the cantilever beam component and the rigidity of the cantilever beam component.
9. The method of claim 6, wherein generating, in real time, the electromagnetic stiffness control signal for each stage according to the target electromagnetic stiffness of each vibration absorbing cell in the vibration absorbing cell group for each stage comprises: Determining the target current of the coil of each vibration absorbing cell in each vibration absorbing cell group corresponding to each order according to the target electromagnetic rigidity of each vibration absorbing cell in each vibration absorbing cell group corresponding to each order; and generating electromagnetic stiffness control signals corresponding to the steps in real time according to the target current of the coils of the vibration absorbing cells in the vibration absorbing cell groups corresponding to the steps.
10. The method according to claim 4, wherein the method further comprises: acquiring feedback data sent by a sensor in the low-frequency sound insulation system in real time, wherein the feedback data is used for indicating the adjusted vibration absorption center frequency of each vibration absorption cell in each vibration absorption cell group corresponding to each order; Determining whether to correct electromagnetic stiffness control signals corresponding to each step according to the feedback data; if so, the electromagnetic stiffness control signals corresponding to the steps are corrected, so that the adjusted vibration absorption center frequency of each vibration absorption cell in the vibration absorption cell group corresponding to the steps is corrected based on the corrected electromagnetic stiffness control signals corresponding to the steps.
11. The method of claim 10, wherein determining whether to modify the electromagnetic stiffness control signal corresponding to each stage based on the feedback data comprises: And determining the difference value between the adjusted vibration absorption center frequency of each vibration absorption cell in the vibration absorption cell group corresponding to each step and the excitation frequency of the engine at the corresponding step according to the feedback data, and determining to correct the electromagnetic stiffness control signal corresponding to each step if the difference value is larger than a preset threshold value.

Description

Vibration absorbing cell, low-frequency sound insulation system and low-frequency sound insulation method Technical Field The application relates to the technical field of automobile sound insulation, in particular to a vibration absorbing cell, a low-frequency sound insulation system and a low-frequency sound insulation method. Background In the automotive field, structural noise and air noise generated when an engine is running are major factors affecting the comfort of sound vibrations in a vehicle. At present, in the aspect of noise transmission path optimization, measures for optimizing a vehicle body structure design and adding an acoustic cladding are generally adopted to weaken the transmission of noise, and the noise transmission path has good attenuation effect in a high frequency band, but has poor suppression effect on low-frequency noise. The passive super structure is generally adopted to inhibit low-frequency noise, but the vibration absorption frequency band of the passive super structure with low-frequency noise reduction is fixed, and is difficult to carry out self-adaptive adjustment according to the environmental change of external noise, so that the sound insulation performance is insufficient in a low-frequency region. Therefore, the prior art has certain limitations for low-frequency sound insulation of automobiles. Disclosure of Invention The application aims to provide a vibration absorbing cell, a low-frequency sound insulation system and a low-frequency sound insulation method for solving the problem that the prior art has a certain limitation on low-frequency sound insulation of automobiles. In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows: In a first aspect, an embodiment of the present application provides a vibration absorbing cell, where the vibration absorbing cell includes a cantilever beam assembly, a permanent magnet, and a coil; the cantilever beam component is of a gamma-shaped structure and comprises a vertical part and a horizontal part, wherein one end of the horizontal part is connected with the top end of the vertical part; The permanent magnet is arranged at the other end of the horizontal part, and is parallel and opposite to the vertical part; The coil is sleeved outside the permanent magnet, and the coil, the permanent magnet and the horizontal part are arranged in a separated mode. As an alternative embodiment, the cantilever beam assembly includes a metal layer and damping layers disposed on both side surfaces of the metal layer. In a second aspect, an embodiment of the present application provides a low-frequency sound insulation system, where the low-frequency sound insulation system includes a control module and an acoustic super-structure array disposed on a vehicle body panel, where the acoustic super-structure array includes a plurality of vibration absorbing cell groups, and the vibration absorbing cell groups include a plurality of the vibration absorbing cells described in the first aspect; The coil of the vibration absorbing unit cell is fixedly arranged on the vehicle body panel and is configured to be connected with a control module; The bottom of the vertical part of the vibration absorbing unit cell is vertical to the surface of the vehicle body panel and fixedly connected with the surface of the vehicle body panel. In a third aspect, an embodiment of the present application provides a low-frequency sound insulation method, which is applied to the control module in the low-frequency sound insulation system described in the second aspect, where the method includes: acquiring the rotating speed data of an engine in real time; determining the excitation frequency of the engine at each stage according to the rotating speed data; generating electromagnetic stiffness control signals corresponding to each step according to the excitation frequency of the engine at each step; Sending electromagnetic rigidity control signals corresponding to each order to each vibration absorbing cell in the vibration absorbing cell group corresponding to each order, so that each vibration absorbing cell can adjust the vibration absorbing center frequency under the action of the electromagnetic rigidity control signals, and enable each vibration absorbing cell to generate local resonance and absorb low-frequency noise of an engine in the corresponding order in real time. As an optional implementation manner, the generating the electromagnetic stiffness control signal corresponding to each step according to the excitation frequency of the engine at each step includes: and generating electromagnetic stiffness control signals corresponding to each order in real time according to the excitation frequency of the engine at each order and the attribute parameters of the vibration absorbing cell group corresponding to each order. As an alternative implementation manner, the attribute parameters of the vibratio