CN109435866B - Sound absorption device for automobile cab and control method thereof - Google Patents
Sound absorption device for automobile cab and control method thereof Download PDFInfo
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- CN109435866B CN109435866B CN201811579281.5A CN201811579281A CN109435866B CN 109435866 B CN109435866 B CN 109435866B CN 201811579281 A CN201811579281 A CN 201811579281A CN 109435866 B CN109435866 B CN 109435866B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 67
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000013139 quantization Methods 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 7
- 239000011358 absorbing material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 230000009467 reduction Effects 0.000 abstract description 9
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- 239000006096 absorbing agent Substances 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
- B60R13/0815—Acoustic or thermal insulation of passenger compartments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Abstract
The invention discloses a sound absorption device for an automobile cab, which comprises: a shell which is of a hollow cuboid structure with an opening at the bottom surface; the transmission shafts are arranged in the shell, and two ends of the transmission shafts are rotatably arranged on two radial sides of the shell and are arranged at equal intervals along the axial direction of the shell; the double-layer swing blades are rectangular plates and are respectively axially fixed on the transmission shaft in a sleeved mode; the power mechanism is connected with the transmission shaft and used for driving the transmission shaft to rotate; the top surface of the double-layer swing blade is provided with a sound absorption material layer and faces towards the same direction, and the bottom surface of the double-layer swing blade is provided with a sound reflection layer. The invention also discloses a control method of the sound absorption device of the automobile cab, which is provided with the double-layer swing blades, and can control the rotation of the transmission shaft based on the PID fuzzy controller according to whether the sound system in the automobile is closed or not and the noise in the cab, thereby ensuring the sound absorption and the noise reduction of the cab and the playing effect of the automobile sound.
Description
Technical Field
The invention relates to the technical field of sound absorption and noise reduction in an automobile cab, in particular to a sound absorption device for an automobile cab and a control method thereof.
Background
At present, along with the continuous improvement of automobile research and development technology and living standard of people, the requirements of people on riding comfort of automobiles are also higher and higher. Noise is an important factor affecting comfort, and in order to suppress noise in a vehicle when the vehicle is traveling at a high speed, it is ensured that the vehicle has sufficient sound absorbing ability, and sound absorbing materials are widely used in vehicle research and development. Because the noise is great when the automobile runs, the sound absorption device is required to absorb sound, but the sound absorption device can influence the sound transmission to a certain extent when the automobile sound system works, so that the definition of the voice in the automobile is reduced.
Disclosure of Invention
The invention aims to design and develop a sound absorption device for an automobile cab, which is provided with double-layer swing blades and can control a transmission shaft to rotate according to whether an in-car sound system is closed or not and the noise in the cab, so that the sound absorption and the noise reduction of the cab are ensured, and the playing effect of the automobile sound is also ensured.
The invention further aims to design and develop a control method of the sound absorption device of the automobile cab, which is provided with double-layer swing blades, can control the rotation of a transmission shaft based on a PID fuzzy controller according to whether an in-car sound system is closed or not and the noise in the cab, and ensures the sound absorption and noise reduction of the cab and the playing effect of the automobile sound.
The technical scheme provided by the invention is as follows:
an automotive cab sound absorption device comprising:
a shell which is of a hollow cuboid structure with an opening at the bottom surface; and
the transmission shafts are arranged in the shell, and two ends of the transmission shafts are rotatably arranged on two radial sides of the shell and are arranged at equal intervals along the axial direction of the shell;
the double-layer swing blades are rectangular plates and are respectively axially fixed on the transmission shaft in a sleeved mode;
the power mechanism is connected with the transmission shaft and used for driving the transmission shaft to rotate;
the top surface of the double-layer swing blade is provided with a sound absorption material layer and faces the same direction, and the bottom surface of the double-layer swing blade is provided with a sound reflection layer; when the transmission shaft rotates clockwise by 0-180 degrees, the top surface of the double-layer swing blade is gradually upward, and when the transmission shaft rotates anticlockwise by 0-180 degrees, the bottom surface of the double-layer swing blade is gradually upward; when the top surface or the bottom surface of the double-layer swing blade is parallel to the bottom surface of the shell, the distance between the adjacent side surfaces of the adjacent double-layer swing blades is 0-5 mm.
Preferably, the power mechanism includes:
the driven wheels are fixedly sleeved at two ends of the transmission shaft close to the inner wall of the shell;
a belt wound around the driven pulley for driving the driven pulley to rotate synchronously;
the driving wheel is coaxially connected with any driven wheel and is used for driving the driven wheel to rotate;
and the driving motor is fixedly arranged on the shell, and the output end of the driving motor is fixedly connected with the driving wheel and is used for driving the driving wheel to rotate.
Preferably, the sound absorption device further comprises a sound absorption material block which is arranged in a space surrounded by the top surface of the shell and the double-layer swing blade and fixedly connected with the bottom surface of the shell.
Preferably, the method further comprises:
the fixed plate is fixedly arranged on the top surface of the shell;
and the through hole is arranged on the fixed plate and is fixedly connected with the ceiling of the automobile cab.
Preferably, when the top or bottom surface of the double-layered swing blade is parallel to the bottom surface of the housing, the distance between the adjacent side surfaces of the adjacent double-layered swing blade is 0mm.
Preferably, the method further comprises:
a speed sensor provided on the vehicle body for detecting a vehicle speed;
the sound sensor is arranged in the automobile cab and is used for detecting noise decibels in the automobile cab;
the angle sensor is arranged on the transmission shaft and used for detecting the rotation angle of the transmission shaft;
and the controller is connected with the driving motor and used for controlling the transmission shaft to rotate.
A control method of an automobile cab sound absorption device comprises a fuzzy controller, wherein when an in-car sound system is closed:
noise decibel N in automobile cab v And the automobile driving speed V input fuzzy controller, wherein the noise decibel N in the automobile cab v And the running speed V of the automobile are classified into 7 grades;
the fuzzy controller outputs the rotation angle theta of the transmission shaft, and the output is divided into 7 grades;
noise decibel N in automobile cab v Is [0, 1]]The quantization factor is 84; the fuzzy universe of the running speed V of the automobile is [0, 1]]The quantization factor is 22; the fuzzy universe of the rotation angle theta of the output transmission shaft is [0,1]The quantization factor is 180;
the fuzzy set of inputs and outputs is NB, NM, NS,0,PS,PM,PB.
Preferably, the method further comprises a fuzzy PID controller:
input of noise decibel N in ith automobile cab v And ideal noise decibelThe proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are input into a PID controller to carry out error compensation control on the rotation angle of the transmission shaft.
It is preferred that the composition of the present invention,
noise decibel N in automobile cab v And ideal noise decibelThe fuzzy argument of the deviation e of (2) is [ -1,1]The quantization factor is 15; the fuzzy universe of variation rate of deviation ec is [ -3,3]The quantization factor is 1;
the fuzzy domain of the proportional coefficient of the output PID is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the proportional integral coefficient is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the differential coefficient is [ -1,1], its quantization factor is 0.0001;
the deviation e and the deviation change rate ec are divided into 7 grades; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades;
the fuzzy set of inputs and outputs of the fuzzy PID controller is { NB, NM, NS,0,PS,PM,PB }.
Preferably, when the in-car audio system is turned on, the control transmission shaft rotates counterclockwise so that the bottom surface of the double-layer swing blade faces upward and is parallel to the bottom surface of the shell.
The beneficial effects of the invention are as follows:
(1) The sound absorption device for the automobile cab, which is designed and developed by the invention, is provided with the double-layer swing blades, so that the rotation of the transmission shaft can be controlled according to whether the sound system in the automobile is closed or not and the noise in the cab, thereby ensuring the sound absorption and noise reduction of the cab and the playing effect of the automobile sound. Has the characteristics of simple structure, portability, easy industrialized mass production, low cost, convenient arrangement and easy installation.
(2) The control method of the sound absorption device of the automobile cab designed and developed by the invention is provided with the double-layer swing blades, so that the rotation of the transmission shaft can be controlled based on the PID fuzzy controller according to whether the sound system in the automobile is closed or not and the noise in the cab, thereby ensuring the sound absorption and noise reduction of the cab and the playing effect of the automobile sound.
Drawings
Fig. 1 is a schematic structural view of an automobile cab sound absorber according to the present invention.
Fig. 2 is a schematic structural view of the sound absorbing device for the automobile cab.
Fig. 3 is a schematic side view of the sound absorber for the automobile cab according to the present invention.
Fig. 4 is a schematic view showing a bottom view of the sound absorbing device for the automobile cab.
Fig. 5 is a control schematic of the fuzzy controller and fuzzy PID controller according to the present invention.
FIG. 6 shows the noise in dB N of the fuzzy controller in the automobile cab v Membership function graph of (a).
FIG. 7 is a membership function chart of the input vehicle travel speed V of the fuzzy controller according to the present invention.
FIG. 8 is a membership function chart of the rotation angle θ of the output drive shaft of the fuzzy controller according to the present invention.
FIG. 9 is a membership function chart of the input bias e of the fuzzy PID controller according to the invention.
FIG. 10 is a membership function graph of the input bias change rate ec of the fuzzy PID controller according to the invention.
FIG. 11 shows the output scaling factor K of the fuzzy PID controller according to the invention p Membership function graph of (a).
FIG. 12 shows the output proportional-integral-coefficient K of the fuzzy PID controller according to the invention i Membership function graph of (a).
FIG. 13 shows the differential coefficient K of the output of the fuzzy PID controller according to the invention d Membership function graph of (a).
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
As shown in fig. 1 to 4, the present invention provides an automobile cab sound absorption device, comprising: a housing 100 having a hollow rectangular parallelepiped structure with an opening at the bottom; and a plurality of transmission shafts 110 disposed in the housing 100, both ends of which are rotatably disposed at both sides of the housing 100 in a radial direction and are arranged at equal intervals in an axial direction of the housing 100; the double-layer swing blades 120 are rectangular plates and are respectively axially fixed on the transmission shaft 110; and the power mechanism is connected with the transmission shaft 110 and is used for driving the transmission shaft 110 to rotate.
The top surface of the double-layer swing blade 120 is provided with a sound absorption material layer and faces the same direction, and the bottom surface is provided with a sound reflection layer; in the initial position, the top surface and the bottom surface of the double-layer swing blade 120 are perpendicular to the bottom surface of the casing 100, and when the transmission shaft 110 rotates clockwise by 0-180 degrees, the top surface of the double-layer swing blade 120 gradually faces upwards, so that noise in a cab can be absorbed and reduced. When the transmission shaft 110 rotates 0-180 degrees anticlockwise, the bottom surface of the double-layer swing blade 120 is gradually upward, so that sound in the cab can be reflected, and the sound effect in the cab is improved. When the top surface or the bottom surface of the double-layer swing blade 120 is parallel to the bottom surface of the shell 100, the distance between the adjacent side surfaces of the adjacent double-layer swing blade 120 is 0-5 mm, and of course, the preferred distance is 0mm, that is, the adjacent side surfaces of the adjacent double-layer swing blade 120 are in contact with each other, so that the sound absorption or reflection effect can be better achieved.
The power mechanism comprises: a plurality of driven wheels 131 fixedly sleeved on two ends of the transmission shaft 110 close to the inner wall of the shell 100; a belt 132 wound around the driven pulley 131 for driving the driven pulley 131 to rotate synchronously; a driving wheel (not shown) coaxially connected to any one of the driven wheels 131 for driving the driven wheels 131 to rotate; a driving motor 133 is fixedly disposed on the housing 100, and an output end is fixedly connected to a driving wheel (not shown) for driving the driving wheel to rotate. That is, when the driving motor 133 works, the output end of the driving motor drives the driving wheel to rotate, the rotating wheel drives the driven wheel 131 connected with the driving wheel to rotate, and under the action of the belt, the driven wheel 132 synchronously rotates, so as to drive the transmission shaft 110 to synchronously rotate, and finally, the multi-layer swing blades 120 are synchronously rotated.
In the space enclosed by the top surface of the casing 110 and the double-layer swing blades 120, and a sound absorption material block (not shown in the figure) is fixedly connected with the bottom surface of the casing 100, so that the sound absorption can be assisted, and the sound absorption and noise reduction effects can be improved.
A fixing plate 140 fixedly disposed on the top surface of the case 100; and a through hole 141 provided on the fixing plate 140 for fixedly connecting with the ceiling of the automobile cab.
A speed sensor provided on the vehicle body for detecting a vehicle speed; the sound sensor is arranged in the automobile cab and is used for detecting noise decibels in the automobile cab; the angle sensor is arranged on the transmission shaft and used for detecting the rotation angle of the transmission shaft; and the controller is connected with the driving motor and used for controlling the rotation of the transmission shaft.
The sound absorption device for the automobile cab, which is designed and developed by the invention, is provided with the double-layer swing blades, so that the rotation of the transmission shaft can be controlled according to whether the sound system in the automobile is closed or not and the noise in the cab, thereby ensuring the sound absorption and noise reduction of the cab and the playing effect of the automobile sound. Has the characteristics of simple structure, portability, easy industrialized mass production, low cost, convenient arrangement and easy installation.
The invention also provides a control method of the sound absorption device of the automobile cab, wherein the controller comprises a fuzzy controller and a fuzzy PID controller:
when the in-car audio system is turned off: the control method is shown in fig. 5, and comprises the following steps:
step 1: noise decibel N in automobile cab v The vehicle running speed V and the rotation angle theta of the transmission shaft are subjected to fuzzy processing; noise decibel N in the vehicle cabin when uncontrolled v Is [0, 1]]The quantization factor is 84; fuzzy universe of automobile running speed V [0, 1]]The quantization factor is 22; the fuzzy universe of the rotation angle theta of the output transmission shaft is [0,1]The quantization factor is 180; in order to ensure the control precision and realize better control, experiments are repeatedly carried out to determine the optimal input and output levels, wherein the noise decibel N in the automobile cab v And the running speed V of the automobile are classified into 7 grades; the rotation angle theta of the output transmission shaft is output in 7 grades; the fuzzy sets of input and output are both NB, NM, NS,0,PS,PM,PB. Wherein, the control rule of the fuzzy controller is:
(1.1) noise decibel N in automobile cab v Certain, the running speed V of the automobile is increased, and the rotation angle theta of the transmission shaft needs to be increased;
(1.2) the running speed V of the automobile is constant, and the noise in the automobile cab is decibel N v When the rotation angle theta of the transmission shaft is increased, the rotation angle theta of the transmission shaft needs to be increased;
the specific control rules of the fuzzy control are shown in the table I.
Fuzzy control meter for rotation angle of meter-drive shaft
Noise decibel N input into automobile cab by fuzzy controller v And the running speed V of the automobile, the rotation angle theta of the output transmission shaft of the fuzzy controller is obtained by using a fuzzy control rule table I, and the rotation angle theta of the transmission shaft is defuzzified by using a gravity center method.
Step 2: fuzzy PID controller
The ith noise decibel N in the automobile cab v And ideal noise decibelThe deviation e, the deviation change rate ec, the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are subjected to fuzzy processing, and when the control is not performed, the fuzzy argument of the deviation e is [ -1,1]The quantization factor is 15; fuzzy universe of variation rate of deviation ec [ -3,3]The quantization factor is 1; proportional coefficient K of PID p The ambiguity domain of (1) is [ -1,1]The quantization factor is 0.1; proportional integral coefficient K i The ambiguity domain of (1) is [ -1,1]The quantization factor is 0.1; differential coefficient K d The ambiguity domain of (1) is [ -1,1]The quantification factor is 0.0001. In order to ensure the control precision and realize better control, experiments are repeatedly carried out, and the optimal input and output levels are determined, wherein the deviation e and the deviation change rate ec in the fuzzy controller are divided into 7 levels; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades; the fuzzy sets of input and output are { NB, NM, NS,0,PS,PM,PB }, and the membership functions of input and output are triangle membership functions, see in detail figures 6-13. The fuzzy control rule is as follows:
1. when the deviation |e| is large, K is increased p Thereby the deviation is reduced rapidly, but a larger deviation change rate is generated at the same time, a smaller K is adopted d K is usually taken i ＝0；
2. When the values of |ec| and |e| are at medium, K is suitably reduced to avoid overshoot p To take the value of K i Smaller, select K of appropriate size d ；
3. When the deviation |e| is small, K is increased p K i To avoid unstable oscillation around the steady state value of the system, the value of (1) is usually set to be smaller when |ec| is larger d The method comprises the steps of carrying out a first treatment on the surface of the When |ec| is small, a large K is taken d The method comprises the steps of carrying out a first treatment on the surface of the The specific fuzzy control rules are shown in tables II, III and IV.
Table II proportional coefficient K of PID p Fuzzy control table of (a)
Table three PID proportional integral coefficient K i Fuzzy control table of (a)
Differential coefficient K of Table four PID d Fuzzy control table of (a)
Input of noise decibel N in ith automobile cab v And ideal noise decibelThe deviation e and the deviation change rate ec of the output PID, the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are defuzzified by a height method, the input PID controller is used for carrying out error compensation control on the rotation angle of the transmission shaft, and the control formula is as follows:
the experiment repeatedly determines that the rotation angle theta of the transmission shaft is accurately controlled by the fuzzy PID controller, and the rotation angle theta of the transmission shaft is the sum of the output angle of the fuzzy controller and the angle error compensation value of the PID controller, so that the rotation angle of the transmission shaft is accurately controlled, and the deviation is smaller than 0.1%.
When the sound system in the car is started, the transmission shaft is controlled to rotate anticlockwise, so that the bottom surface of the double-layer swing blade faces upwards and is parallel to the bottom surface of the shell.
The control method of the sound absorption device of the automobile cab designed and developed by the invention is provided with the double-layer swing blades, so that the rotation of the transmission shaft can be controlled based on the PID fuzzy controller according to whether the sound system in the automobile is closed or not and the noise in the cab, thereby ensuring the sound absorption and noise reduction of the cab and the playing effect of the automobile sound.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (7)
1. The control method of the sound absorption device of the automobile cab is characterized by comprising a fuzzy controller, wherein when an in-car sound system is closed:
noise decibel N in automobile cab v And the automobile driving speed V input fuzzy controller, wherein the noise decibel N in the automobile cab v And the running speed V of the automobile are classified into 7 grades;
the fuzzy controller outputs the rotation angle theta of the transmission shaft, and the output is divided into 7 grades;
noise decibel N in automobile cab v Is [0, 1]]The quantization factor is 84; the fuzzy universe of the running speed V of the automobile is [0, 1]]The quantization factor is 22; the fuzzy universe of the rotation angle theta of the output transmission shaft is [0,1]The quantization factor is 180;
the fuzzy set of input and output is { NB, NM, NS,0,PS,PM,PB };
the method also comprises the steps of:
input of noise decibel N in ith automobile cab v And ideal noise decibelThe proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are input into a PID controller to carry out error compensation control on the rotation angle of the transmission shaft;
noise decibel N in automobile cab v And ideal noise decibelThe fuzzy argument of the deviation e of (2) is [ -1,1]The quantization factor is 15; the fuzzy universe of variation rate of deviation ec is [ -3,3]The quantization factor is 1;
the fuzzy domain of the proportional coefficient of the output PID is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the proportional integral coefficient is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the differential coefficient is [ -1,1], its quantization factor is 0.0001;
the deviation e and the deviation change rate ec are divided into 7 grades; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades;
the fuzzy set of the input and output of the fuzzy PID controller is { NB, NM, NS,0,PS,PM,PB };
the automobile cab sound absorption device comprises:
a shell which is of a hollow cuboid structure with an opening at the bottom surface; and
the transmission shafts are arranged in the shell, and two ends of the transmission shafts are rotatably arranged on two radial sides of the shell and are arranged at equal intervals along the axial direction of the shell;
the double-layer swing blades are rectangular plates and are respectively axially fixed on the transmission shaft in a sleeved mode;
the power mechanism is connected with the transmission shaft and used for driving the transmission shaft to rotate;
the top surface of the double-layer swing blade is provided with a sound absorption material layer and faces the same direction, and the bottom surface of the double-layer swing blade is provided with a sound reflection layer; when the transmission shaft rotates clockwise by 0-180 degrees, the top surface of the double-layer swing blade is gradually upward, and when the transmission shaft rotates anticlockwise by 0-180 degrees, the bottom surface of the double-layer swing blade is gradually upward; when the top surface or the bottom surface of the double-layer swing blade is parallel to the bottom surface of the shell, the distance between the adjacent side surfaces of the adjacent double-layer swing blades is 0-5 mm.
2. The control method of an automobile cab sound absorption device according to claim 1, wherein the power mechanism includes:
the driven wheels are fixedly sleeved at two ends of the transmission shaft close to the inner wall of the shell;
a belt wound around the driven pulley for driving the driven pulley to rotate synchronously;
the driving wheel is coaxially connected with any driven wheel and is used for driving the driven wheel to rotate;
and the driving motor is fixedly arranged on the shell, and the output end of the driving motor is fixedly connected with the driving wheel and is used for driving the driving wheel to rotate.
3. The control method of the sound absorbing device for the automobile cab according to claim 1 or 2, wherein the sound absorbing device for the automobile cab further comprises a sound absorbing material block which is arranged in a space enclosed by the top surface of the shell and the double-layer swing blade and fixedly connected with the bottom surface of the shell.
4. The control method of an automobile cab sound absorption device according to claim 3, characterized in that the automobile cab sound absorption device further comprises:
the fixed plate is fixedly arranged on the top surface of the shell;
and the through hole is arranged on the fixed plate and is fixedly connected with the ceiling of the automobile cab.
5. The control method of an automobile cab sound absorption device according to claim 1, 2 or 4, wherein when the top surface or bottom surface of the double-layered swing blade is parallel to the bottom surface of the housing, a distance between adjacent side surfaces of the double-layered swing blade is 0mm.
6. The control method of an automobile cab sound absorption device according to claim 3, characterized in that the automobile cab sound absorption device further comprises:
a speed sensor provided on the vehicle body for detecting a vehicle speed;
the sound sensor is arranged in the automobile cab and is used for detecting noise decibels in the automobile cab;
the angle sensor is arranged on the transmission shaft and used for detecting the rotation angle of the transmission shaft;
and the controller is connected with the driving motor and used for controlling the transmission shaft to rotate.
7. The method of controlling an acoustic device for a vehicle cab according to claim 1, wherein when the in-vehicle audio system is turned on, the control transmission shaft is rotated counterclockwise such that the bottom surface of the double-layered swing blade is directed upward and parallel to the bottom surface of the housing.
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