CN218214643U - Active noise reduction system of cab - Google Patents

Abstract

The utility model relates to a technical field of amortization noise reduction, especially relate to cab initiative noise reduction system, it is through sending the sound wave opposite to external noise phase place, the amplitude and the frequency is the same, make the noise neutralize and offset each other, reduced the noise in near staff's ear, improved staff's travelling comfort, need not to change the structure inside the vehicle cab, can realize amortization noise reduction directly with equipment mounting on the seat, the universality is high, the economy and the practicality are high; comprises a headrest and a host, wherein the headrest is electrically connected with the host; the headrest is provided with an A2B microphone, a mounting bracket and a loudspeaker, and the A2B microphone and the loudspeaker are mounted on the headrest.

Description

Active noise reduction system of cab

Technical Field

The utility model relates to a technical field that the amortization was fallen and is made an uproar especially relates to cab initiative noise reduction system.

Background

With the rapid development of the rail transit industry in China, high-speed rails, motor cars and subways become the first choice for people to go out. As the speed of the vehicle is rapidly increased and the number of devices in the vehicle is increased, noise pollution caused by the bumping of the devices when the vehicle is running is also increased. The noise can affect the normal rest of the cab workers, and the cab workers can be irritated, nausea, headache, insomnia and the like when being in a vibration and noise environment for a long time, so that the noise control becomes a mandatory requirement of a design standard. At present, most of the noise reduction principle of the vehicle is a passive noise reduction technology, the shapes of vehicle parts are optimized, new raw materials are used, and the purpose of reducing noise is achieved through sound absorption and noise elimination means. The research of the passive noise reduction mode needs noise monitoring, modeling simulation, new part production and practical application, repeated monitoring and improvement are needed, the research period is long, the workload is large, and the structures of various vehicles are different, so that the passive noise reduction improvement only aims at one vehicle, the limitation is high, the universality is not high, the economical efficiency is poor, and the cab noise reduction device which can be widely applied to various vehicles is needed.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem, the utility model provides a it is through sending with external noise opposite phase place, the sound wave that range and frequency are the same, makes the noise neutralization and offset each other, has reduced the noise in near staff's ear, has improved staff's travelling comfort, need not to change the inside structure of vehicle cab, directly can realize the amortization with equipment fixing on the seat and fall the noise, and the universality is high, the high cab active noise reduction system of economic nature and practicality.

The cab active noise reduction system of the utility model comprises a headrest and a host, wherein the headrest is electrically connected with the host; the headrest is provided with an A2B microphone, a mounting bracket and a loudspeaker, and the A2B microphone and the loudspeaker are mounted on the headrest; the method comprises the following steps that a headrest is installed on a seat of a cab through an installation support, a host is installed below the seat, then the host and the headrest are electrically connected, in the driving process of a vehicle, a worker sits on the seat to rest, the head of the worker is close to the headrest, in the driving process of the vehicle, an A2B microphone in the headrest collects noise transmitted from all directions, meanwhile, the A2B microphone transmits the collected noise signals to the host through the headrest, then, the host sends out anti-noise signals according to the noise condition and transmits the anti-noise signals to the headrest, the headrest sends out sound waves with opposite phases and identical amplitude and frequency with external noise through a loudspeaker after receiving the anti-noise signals, and after the two sound waves are superposed, the noise is neutralized and counteracted with each other, the noise in the vicinity of ears of the worker is reduced, and the comfort of the worker is improved; it need not to change the inside structure of vehicle cab, directly can realize the amortization with equipment fixing on the seat and fall making an uproar, can use on various vehicles, and the universality is high, need not carry out complicated modeling simulation, and economic nature and practicality are high.

Preferably, the speakers comprise two 3.5-inch speakers and two 4-inch speakers, the two 3.5-inch speakers are positioned at the left part and the right part of the headrest, and the two 4-inch speakers are positioned in the middle of the headrest; the two big loudspeakers and the two small loudspeakers are matched for use, the frequency spectrum range of noise reduction is enlarged, and the practicability is improved.

Preferably, a shell is arranged on the headrest and comprises a plurality of screws, a front cover shell, a microphone cover, a main shell and a rear baffle, the front cover shell is arranged at the front end of the main shell, the rear baffle is arranged at the rear end of the main shell, an installation support is arranged at the lower end of the main shell, the rear baffle is arranged on the main shell, an adapter plate and an A2B amplifier plate are arranged at the rear end of the main shell, the A2B amplifier plate is electrically connected with two 3.5-inch speakers and two 4-inch speakers, the adapter plate and the A2B amplifier plate are both arranged at the rear end of the main shell, a threaded hole is formed in the front cover shell, and the two 3.5-inch speakers and the two 4-inch speakers are arranged on the front cover shell through the plurality of screws; the adapter plate and the A2B amplifier board in the main housing can be protected by a back bezel, and the front cover housing is used for mounting a 4-inch speaker and the back bezel.

Preferably, the number of the A2B microphones is 8, two of the microphones are respectively located at the left and right parts of the upper end of the front casing, the other two microphones are located at the top of the main casing, and the remaining four microphones are located at the left rear part and the right rear part of the main casing; through the arrangement, the A2B microphone can receive the noise transmitted from each direction, so that the noise can be conveniently received and processed, and the convenience is improved.

Preferably, the host comprises a shell, a power module and a master controller, and the power module and the master controller are both arranged on the shell; the shell comprises an upper cover, a main body and a lower cover, wherein the upper cover and the lower cover are respectively arranged at the upper part and the lower part of the main body, the lower cover is provided with a positioning hole, a power module and a main controller are both fixedly arranged on the lower cover, the front end of the main body is provided with an aviation plug, the power module is electrically connected with the aviation plug and the main controller, and the power module is used for supplying power to the main controller; through the upper cover, can protect main controller and the power module who covers the installation down, improved the security, insert A2B amplifier board after cascading all A2B microphones, be connected with the main controller through an unshielded twisted pair, pass through outside connecting wire and aviation plug with the main controller and connect, make power module pass through aviation plug and supply power to the main controller.

Preferably, the connection parts among the upper cover, the main body and the lower cover all adopt surrounding type dispensing waterproof layers; through the arrangement, the waterproof effect of the upper cover, the main body and the lower cover is improved.

Preferably, the main shell, the rear baffle and the front cover shell are made of pc materials; through the arrangement, the weight of the headrest is reduced, and the reliability is improved.

Compared with the prior art, the beneficial effects of the utility model are that: it makes the noise neutralization and offset each other through sending the sound wave opposite with external noise phase place, the range is the same with the frequency, has reduced the noise in near staff's ear, has improved staff's travelling comfort, need not to change the inside structure of vehicle cab, need not carry out complicated modeling simulation moreover, directly can realize the amortization with equipment fixing on the seat and fall the noise, and the universality is high, and economic nature and practicality are high.

Drawings

FIG. 1 is a front view of a headrest;

FIG. 2 is a schematic view of an axial structure of the headrest;

FIG. 3 is a rear view of the headrest;

FIG. 4 is a schematic diagram of a front view of a host;

FIG. 5 is a schematic top view of the mainframe;

FIG. 6 is a schematic diagram of an axis measurement structure of the main machine;

in the drawings, the reference numbers: 1. a front cover shell; 2. 4 inch loudspeaker; 3. 3.5 inch speaker; 4. a screw; 5. a microphone cover; 6. a main housing; 7. a tailgate; 8. mounting a bracket; 9. an adapter plate; 10. an A2B amplifier board; 11. an A2B microphone; 21. an upper cover; 22. a main body; 23. a lower cover; 24. an aviation plug; 25. a master controller; 26. and a power supply module.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As shown in fig. 1 to 6, the front housing 1 is installed at the front end of the main housing 6, the rear baffle 7 is installed at the rear end of the main housing 6, the mounting bracket 8 is installed at the lower end of the main housing 6, the rear baffle 7 is arranged on the main housing 6, the adapter plate 9 and the A2B amplifier plate 10 are arranged at the rear end of the main housing 6, the A2B amplifier plate 10 is electrically connected with the two 3.5-inch speakers 3 and the two 4-inch speakers 2, the adapter plate 9 and the A2B amplifier plate 10 are both installed at the rear end of the main housing 6, the front housing 1 is provided with threaded holes, and the two 3.5-inch speakers 3 and the two groups of 4-inch speakers 2 are installed on the front housing 1 through a plurality of screws 4; the power module 26 and the main controller 25 are both arranged on the shell; the shell comprises an upper cover 21, a main body 22 and a lower cover 23, wherein the upper cover 21 and the lower cover 23 are respectively arranged at the upper part and the lower part of the main body 22, a positioning hole is formed in the lower cover 23, a power module 26 and a main controller 25 are fixedly arranged on the lower cover 23, an aviation plug 24 is arranged at the front end of the main body 22, the power module 26 is electrically connected with the aviation plug 24 and the main controller 25, the power module 26 is used for supplying power to the main controller 25, and a connection part among the upper cover 21, the main body 22 and the lower cover 23 adopts a surrounding type dispensing waterproof layer; firstly, the mounting bracket 8 is mounted on a seat of a cab, the host is placed below the seat or in an electrical cabinet of the cab, noise generated in the driving process of a vehicle is transmitted to the master controller 25 through the A2B microphones 11 and the A2B amplifier board 10, then the master controller 25 enables the two 3.5-inch loudspeakers 3 and the two 4-inch loudspeakers 2 to emit sound waves with opposite phases and same amplitude and frequency with the noise through the A2B amplifier board 10, the noise is neutralized and counteracted, noise in the vicinity of ears of workers is reduced, the comfort of the workers is improved, the structure in the cab of the vehicle is not required to be changed, the noise can be reduced by directly mounting the equipment on the seat, and the noise reduction is realized.

The utility model discloses the main function who realizes does:

1. the utility model discloses an on-vehicle A2B audio bus technical scheme, master controller 25 is small, need not to design signal processing circuit, only needs to carry out signal communication with A2B microphone 11 and A2B amplifier board 10 and can accomplish the function of making an uproar of falling, and the space that occupies the cab is few.

2. An A2B amplifier board 10 is added in the headrest, all wires of 4 loudspeakers and 8A 2B microphones 11 are integrated on the A2B amplifier board 10, and the A2B amplifier board is connected to a host machine through a wire unshielded twisted pair. Fewer cables are used, reducing the cost of using the cables.

3. The headrest shell is made of PC materials, so that the weight of the headrest can be effectively reduced. The headrest shell is divided into a front housing, a main housing, a rear baffle and a microphone cover. The loudspeaker and the microphone can be installed, and circuit boards such as amplifier boards can be installed.

4. The utility model discloses an integrated level is high, only needs to change driver's seat head rest, need not to change built-in structure and can accomplish driver's ear and fall the function of making an uproar, but wide application in various vehicle cabs, like railway locomotive, the abominable cab of environment such as heavy locomotive has the universality, has reduced the local limitation.

The cab active noise reduction system of the utility model has the advantages that the installation mode, the connection mode or the setting mode are common mechanical modes, and the system can be implemented as long as the beneficial effects can be achieved; the utility model discloses a cab initiative noise reduction system's A2B amplifier board 10, 4 cun speakers 2, 3.5 cun speakers 3, screw 4, A2B amplifier board 10, A2B microphone 11, aviation plug 24, master controller 25 and power module 26 are the purchase on the market, technical staff only need according to its subsidiary service instruction install and operate can in this industry, and need not the technical staff's of this field creative work.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the description of the present invention, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention is understood according to the specific circumstances.

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. The active noise reduction system of the cab is characterized by comprising a headrest and a host, wherein the headrest is electrically connected with the host; the headrest is provided with an A2B microphone (11), a mounting bracket (8) and a loudspeaker, and the A2B microphone (11) and the loudspeaker are mounted on the headrest.

2. The cab active noise reduction system of claim 1, wherein the speakers comprise two 3.5 inch speakers (3) and two 4 inch speakers (2), the two 3.5 inch speakers (3) being located at the left and right portions of the headrest, and the two 4 inch speakers (2) being located at the middle portion of the headrest.

3. The active noise reduction system of the cab according to claim 1, wherein a housing is arranged on the headrest, the housing comprises a plurality of screws (4), a front housing (1), a microphone cover (5), a main housing (6) and a rear baffle (7), the front housing (1) is arranged at the front end of the main housing (6), the rear baffle (7) is arranged at the rear end of the main housing (6), a mounting bracket (8) is arranged at the lower end of the main housing (6), the rear baffle (7) is arranged on the main housing (6), an adapter plate (9) and an A2B amplifier plate (10) are arranged at the rear end of the main housing (6), the A2B amplifier plate (10) is electrically connected with two 3.5-inch speakers (3) and two 4-inch speakers (2), the adapter plate (9) and the A2B amplifier plate (10) are both arranged at the rear end of the main housing (6), the front housing (1) is provided with threaded holes, and the two 3.5-inch speakers (3) and the two 4-inch speakers (2) are arranged on the front housing (1) through the plurality of screws (4).

4. The cab active noise reduction system according to claim 1, wherein the number of the A2B microphones (11) is 8, two of which are respectively located at the left and right parts of the upper end of the front housing (1), the other two are located at the top of the main housing (6), and the remaining four are located at the left and right rear parts of the main housing (6).

5. The cab active noise reduction system of claim 1, wherein the host includes a housing, a power module (26) and a master controller (25), the power module (26) and the master controller (25) both being mounted on the housing; the casing includes upper cover (21), main part (22) and lower cover (23), and upper cover (21) and lower cover (23) are installed respectively in the upper and lower two of main part (22), are provided with the locating hole on lower cover (23), and equal fixed mounting of power module (26) and master controller (25) is on lower cover (23), and the front end of main part (22) is provided with aviation plug (24), and power module (26) are connected with aviation plug (24) and master controller (25) electricity, and power module (26) are used for supplying power to master controller (25).

6. The cab active noise reduction system according to claim 5, wherein the connection portions among the upper cover (21), the main body (22) and the lower cover (23) are all made of a surrounding type glue-dispensing waterproof layer.

7. The cab active noise reduction system according to claim 3, wherein the main housing (6), the rear baffle (7) and the front housing (1) are pc-based.

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