CN109435866A - A kind of automobile cab sound absorber and its control method - Google Patents
A kind of automobile cab sound absorber and its control method Download PDFInfo
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- CN109435866A CN109435866A CN201811579281.5A CN201811579281A CN109435866A CN 109435866 A CN109435866 A CN 109435866A CN 201811579281 A CN201811579281 A CN 201811579281A CN 109435866 A CN109435866 A CN 109435866A
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- 239000011358 absorbing material Substances 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 10
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
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- 238000002474 experimental method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
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Classifications
-
- 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
-
- 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
-
- 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 present invention discloses a kind of automobile cab sound absorber, comprising: shell is the hollow rectangular parallelepiped structure of bottom opening；And multiple transmission shafts, it is arranged in the shell, and both ends are rotatably disposed in the shell radially opposite sides, and along the axial equidistant arrangement of the shell；Multiple double-deck pendulum leaves, are rectangular slab, and axial restraint is set on the transmission shaft respectively；Power mechanism, and the transmission axis connection, for driving the transmission shaft to rotate；Wherein, the top surface of the double-deck pendulum leaf is provided with sound-absorbing material layer and towards consistent, and bottom surface is provided with sound reflection layer.Invention additionally discloses a kind of control methods of automobile cab sound absorber, it is provided with the double-deck pendulum leaf, can according to sound system in a vehicle close whether and drive room noise, and it is rotated based on PID fuzzy Control transmission shaft, both it ensure that driver's cabin sqouynd absorption lowering noise, and in turn ensured automobile audio result of broadcast.
Description
Technical field
The present invention relates to the noise reduction technology fields that absorbs sound in automobile cab, and more particularly, the present invention relates to a kind of automobiles
Driver's cabin sound absorber and its control method.
Background technique
Currently, with automobile research and development technology and continuous improvement of people's living standards, riding comfort of the people to automobile
It is required that also higher and higher.Noise is an important factor for influencing comfort, and interior noise when in order to inhibit high vehicle speeds is protected
Card vehicle possesses enough sound absorbing powers, and sound-absorbing material is widely applied in vehicle research and development.When due to running car noise compared with
Die needs sound absorber to absorb sound, but when car audio system is worked can be influenced by its sound absorber, to a certain extent
It will affect voice propagation, interior speech intelligibility caused to decline.
Summary of the invention
It is an object of the invention to design and develop a kind of automobile cab sound absorber, it is provided with the double-deck pendulum leaf, energy
Noise control transmission shaft rotates whether enough closings according to sound system in a vehicle and in driver's cabin, both ensure that driver's cabin sound absorption drop
It makes an uproar, in turn ensures automobile audio result of broadcast.
Another object of the present invention is to have designed and developed a kind of control method of automobile cab sound absorber, is provided with
Bilayer pendulum leaf whether capable of closing according to sound system in a vehicle and drives room noise, and is based on PID fuzzy Control
Transmission shaft rotation, both ensure that driver's cabin sqouynd absorption lowering noise, and had in turn ensured automobile audio result of broadcast.
Technical solution provided by the invention are as follows:
A kind of automobile cab sound absorber, comprising:
Shell is the hollow rectangular parallelepiped structure of bottom opening；And
Multiple transmission shafts are arranged in the shell, and both ends are rotatably disposed in the shell radially opposite sides, and edge
The axial equidistant arrangement of the shell；
Multiple double-deck pendulum leaves, are rectangular slab, and axial restraint is set on the transmission shaft respectively；
Power mechanism, and the transmission axis connection, for driving the transmission shaft to rotate；
Wherein, the top surface of the double-deck pendulum leaf is provided with sound-absorbing material layer and towards consistent, and bottom surface is provided with sound reflection
Layer；When initial position, the top and bottom of the double-deck pendulum leaf are vertical with the housing bottom surface, when the transmission shaft is clockwise
At 0~180 ° of rotation, the top surface of the double-deck pendulum leaf is gradually upward, described when the transmission shaft rotates 0~180 ° counterclockwise
The bottom surface of bilayer pendulum leaf is gradually upward；When the top surface of the double-deck pendulum leaf or the bottom surface housing bottom surface in parallel, adjacent institute
The distance between adjacent side of the double-deck pendulum leaf is stated as 0~5mm.
Preferably, the power mechanism includes:
Multiple driven wheels fix the both ends of the drive shaft being set in close to the inner walls；
Belt winds the driven wheel, for driving the driven wheel synchronous rotary；
Driving wheel, it is coaxially connected with any one of driven wheel, for driving the driven wheel to rotate；
Driving motor is fixedly installed on the housing, and output end is fixedly connected with the driving wheel, for driving
The driving wheel rotation.
Preferably, further include sound-absorbing material block, the housing top surface and the double-deck sky putting leaf and surrounding are set
In, and be fixedly connected with the housing bottom surface.
Preferably, further includes:
Fixed plate is fixed in the housing top surface；
Through-hole is arranged in the fixed plate, for being fixedly connected with automobile cab ceiling.
Preferably, when the top surface of the double-deck pendulum leaf or the bottom surface housing bottom surface in parallel, the adjacent bilayer
Putting the distance between adjacent side of leaf is 0mm.
Preferably, further includes:
Velocity sensor is arranged on vehicle body, for detecting speed；
Sound transducer is arranged in car steering room, for detecting the noise decibel in car steering room；
Angular transducer is arranged on the transmission shaft, for detecting the rotation angle of transmission shaft；
Controller is connect with the driving motor, for controlling the transmission shaft rotation.
A kind of control method of automobile cab sound absorber, including fuzzy controller, when sound system in a vehicle is closed:
By the noise decibel N in car steering roomvFuzzy controller, the car steering are inputted with automobile driving speed V
Room noise decibel NvIt is 7 grades with automobile driving speed V points；
The rotation angle, θ of fuzzy controller take-off (propeller) shaft, output are divided into 7 grades；
Noise decibel N in the car steering roomvFuzzy domain be [0,1], quantizing factor 84；The automobile
The fuzzy domain of travel speed V is [0,1], quantizing factor 22；Take-off (propeller) shaft rotation angle, θ fuzzy domain be [0,
1], quantizing factor 180；
The fuzzy set output and input is { NB, NM, NS, 0, PS, PM, PB }.
Preferably, further include fuzzy controller:
Input the noise decibel N in i-th of car steering roomvWith ideal noise decibelDeviation, deviation variation rate, it is defeated
The proportionality coefficient of PID, proportion integral modulus and differential coefficient out, proportionality coefficient, proportion integral modulus and differential coefficient input PID
Controller carries out the error compensation control of transmission shaft rotation angle.
Preferably,
Noise decibel N in the car steering roomvWith ideal noise decibelDeviation e fuzzy domain be [- 1,
1], quantizing factor 15；The fuzzy domain of the deviation variation rate ec is [- 3,3], quantizing factor 1；
The fuzzy domain of the proportionality coefficient of the output PID is [- 1,1], quantizing factor 0.1；Proportion integral modulus
Fuzzy domain be [- 1,1], quantizing factor 0.1；The fuzzy domain of differential coefficient is [- 1,1], and quantizing factor is
0.0001；
The deviation e and deviation variation rate ec points are 7 grades；Proportionality coefficient, the proportion integral modulus of the output PID
It is divided into 7 grades with differential coefficient；
The fuzzy set of the fuzzy controller output and input is { NB, NM, NS, 0, PS, PM, PB }.
Preferably, when sound system in a vehicle is opened, control transmission shaft rotates counterclockwise, so that the bottom surface of the double-deck pendulum leaf
It is upward and parallel with the housing bottom surface.
It is of the present invention the utility model has the advantages that
(1) the automobile cab sound absorber that the present invention designs and develops is provided with the double-deck pendulum leaf, can be according to interior sound equipment
Noise control transmission shaft rotates whether system is closed and in driver's cabin, both ensure that driver's cabin sqouynd absorption lowering noise, and had in turn ensured vapour
Vehicle sound equipment result of broadcast.It is simple with structure, light, be easy to industrialized mass production, be cheap, convenient for arranging, be easy to pacify
The characteristics of dress.
(2) control method for the automobile cab sound absorber that the present invention designs and develops is provided with the double-deck pendulum leaf, Neng Gougen
Whether closing according to sound system in a vehicle and room noise is driven, and is rotated based on PID fuzzy Control transmission shaft, was both protected
Driver's cabin sqouynd absorption lowering noise has been demonstrate,proved, has in turn ensured automobile audio result of broadcast.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of automobile cab sound absorber of the present invention.
Fig. 2 is the structural schematic diagram of automobile cab sound absorber of the present invention.
Fig. 3 is the side structure schematic view of automobile cab sound absorber of the present invention.
Fig. 4 is the present invention looks up structural representation of automobile cab sound absorber of the present invention.
Fig. 5 is the control schematic diagram of fuzzy controller and fuzzy controller of the present invention.
Fig. 6 is the noise decibel N in the input car steering room of fuzzy controller of the present inventionvSubordinating degree function
Figure.
Fig. 7 is the subordinating degree function figure of the input automobile driving speed V of fuzzy controller of the present invention.
Fig. 8 is the subordinating degree function figure of the rotation angle, θ of the take-off (propeller) shaft of fuzzy controller of the present invention.
Fig. 9 is the subordinating degree function figure of the input deviation e of fuzzy controller of the present invention.
Figure 10 is the subordinating degree function figure of the input deviation change rate ec of fuzzy controller of the present invention.
Figure 11 is the export ratio COEFFICIENT K of fuzzy controller of the present inventionpSubordinating degree function figure.
Figure 12 is the export ratio integral coefficient K of fuzzy controller of the present inventioniSubordinating degree function figure.
Figure 13 is the output differential coefficient K of fuzzy controller of the present inventiondSubordinating degree function figure.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
As shown in Figs 1-4, the present invention provides a kind of automobile cab sound absorber, comprising: shell 100 is opened for bottom surface
The hollow rectangular parallelepiped structure of mouth；And multiple transmission shafts 110, it is arranged in the shell 100, and both ends are rotatably disposed in
100 radially opposite sides of shell, and along the axial equidistant arrangement of shell 100；Multiple double-deck pendulum leaves 120, are rectangular slab, and axis respectively
It is set on transmission shaft 110 to fixation；Power mechanism is connect, for driving the transmission shaft with the transmission shaft 110
110 rotations.
The top surface of bilayer pendulum leaf 120 is provided with sound-absorbing material layer and towards consistent, and bottom surface is provided with sound reflection layer；Initially
When position, bilayer pendulum leaf 120 top and bottom with 100 plane perpendicular of shell, when transmission shaft 110 rotates clockwise 0
At~180 °, the top surface of bilayer pendulum leaf 120 gradually upward, can carry out sqouynd absorption lowering noise to indoor noise is driven.Work as transmission shaft
110 counterclockwise 0~180 ° of rotation when, the bottom surface of bilayer pendulum leaf 120 gradually upward, can to drive indoor sound carry out it is anti-
It penetrates, improves and drive indoor acoustics.It is adjacent double when the top surface of the double-deck pendulum leaf 120 or parallel 100 bottom surface of shell in bottom surface
The distance between adjacent side of layer pendulum leaf 120 is 0~5mm, and certainly preferred distance is 0mm, i.e. adjacent double-layers put leaf 120
It contacts with each other between adjacent side, can preferably play the role of sound absorption or reflection.
Power mechanism includes: multiple driven wheels 131, fixes 110 liang of transmission shaft be set in close to 100 inner wall of shell
End；Belt 132 winds driven wheel 131, for driving 131 synchronous rotary of driven wheel；Driving wheel (not shown), with
Any one driven wheel 131 is coaxially connected, for driving driven wheel 131 to rotate；Driving motor 133, is fixed at shell
On 100, and output end is fixedly connected with driving wheel (not shown), for driving driving wheel to rotate.I.e. when driving motor 133
When work, output end drives driving wheel rotation, and rotating wheel drives driven wheel 131 connected to it to rotate, in the effect of belt
Under, 132 synchronous rotary of driven wheel, and then 110 synchronous rotary of transmission shaft is driven, it is final to drive multilayer pendulum leaf 120 is synchronous to turn
It is dynamic.
In the space that 110 top surface of shell and the double-deck pendulum leaf 120 surround, and it is fixedly connected and is provided with 100 bottom surface of shell
Sound-absorbing material block (not shown) can assist absorbing sound, and improve sqouynd absorption lowering noise effect.
Fixed plate 140 is fixed on 100 top surface of shell；Through-hole 141 is arranged in fixed plate 140, is used for
It is fixedly connected with automobile cab ceiling.
Velocity sensor is arranged on vehicle body, for detecting speed；Sound transducer is arranged in automobile cab
It is interior, for detecting the noise decibel in car steering room；Angular transducer is arranged on the transmission shaft, passes for detecting
The rotation angle of moving axis；Controller is connect with the driving motor, for controlling transmission shaft rotation.
The automobile cab sound absorber that the present invention designs and develops is provided with the double-deck pendulum leaf, can be according to interior sound equipment system
Noise control transmission shaft rotates whether system is closed and in driver's cabin, both ensure that driver's cabin sqouynd absorption lowering noise, and had in turn ensured automobile
Sound equipment result of broadcast.It is simple with structure, light, be easy to industrialized mass production, be cheap, convenient for arranging, be easily installed
The characteristics of.
The present invention also provides a kind of control methods of automobile cab sound absorber, and wherein controller includes fuzzy controller
And fuzzy controller:
When sound system in a vehicle is closed: control method is as shown in Figure 5, comprising the following steps:
Step 1: by the noise decibel N in car steering roomv, automobile driving speed V and transmission shaft rotation angle, θ carry out
Fuzzy Processing；Noise decibel N when without control, in car steering roomvFuzzy domain be [0,1], quantizing factor 84；Vapour
The fuzzy domain of vehicle travel speed V is [0,1], quantizing factor 22；The fuzzy domain of the rotation angle, θ of take-off (propeller) shaft is
[0,1], quantizing factor 180；In order to guarantee the precision of control, realizes preferably control, experiment is repeated, it is determined that is best
Output and input grade, wherein noise decibel N in the car steering roomvIt is 7 grades with automobile driving speed V points；It is defeated
The rotation angle, θ of transmission shaft out, output are divided into 7 grades；The fuzzy set output and input be NB, NM, NS, 0, PS, PM,
PB}.Wherein, the control rule of the fuzzy controller are as follows:
(1.1) the noise decibel N in car steering roomvCentainly, automobile driving speed V increases, and needs to increase the rotation of transmission shaft
Gyration θ；
(1.2) automobile driving speed V is certain, the noise decibel N in car steering roomvWhen increase, need to increase transmission shaft
Rotation angle, θ；
The specific control rule of fuzzy control is detailed in table one.
The fuzzy control table of the rotation angle of one transmission shaft of table
Fuzzy controller inputs the noise decibel N in car steering roomvWith automobile driving speed V, fuzzy control rule is used
Table one show that the rotation angle, θ of the take-off (propeller) shaft of fuzzy controller, the rotation angle, θ of transmission shaft utilize gravity model appoach ambiguity solution
Change.
Step 2: fuzzy controller
By the noise decibel N in i-th of car steering roomvWith ideal noise decibelDeviation e, deviation variation rate
Ec, the proportionality coefficient for exporting PID, proportion integral modulus and differential coefficient carry out Fuzzy Processing, and when without control, deviation e's is fuzzy
Domain is [- 1,1], quantizing factor 15；The fuzzy domain of deviation variation rate ec is [- 3,3], quantizing factor 1；The ratio of PID
Example COEFFICIENT KpFuzzy domain be [- 1,1], quantizing factor 0.1；Proportion integral modulus KiFuzzy domain be [- 1,1],
Quantizing factor is 0.1；Differential coefficient KdFuzzy domain be [- 1,1], the quantification factor be 0.0001.In order to guarantee to control
Precision, realize preferably control, experiment is repeated, it is determined that optimal to output and input grade, wherein the Fuzzy Control
Device large deviations e processed, deviation variation rate ec points are 7 grades；Export proportionality coefficient, proportion integral modulus and the differential coefficient of PID
It is divided into 7 grades；The fuzzy set output and input is { NB, NM, NS, 0, PS, PM, PB }, the degree of membership letter output and input
Number is all made of triangular membership, is detailed in Fig. 6-13.Its fuzzy control rule are as follows:
1, when deviation | e | when larger, increase KpValue, so that deviation be made quickly to reduce, but produce simultaneously biggish
Deviation variation rate should take lesser Kd, usually take Ki=0；
2, as | ec | and | e | when value is in medium, to avoid overshoot, suitably reduction KpValue, make KiIt is smaller, selection
Appropriately sized Kd；
3, when deviation | e | when smaller, increase Kp KiValue, to avoid the occurrence of the shakiness oscillated about in systematic steady state value
Determine phenomenon, usually make to work as | ec | when larger, take lesser Kd；When | ec | when smaller, take biggish Kd；Specific fuzzy control rule
Then it is detailed in table two, three and four.
The Proportional coefficient K of two PID of tablepFuzzy control table
The proportion integral modulus K of three PID of tableiFuzzy control table
The differential coefficient K of four PID of tabledFuzzy control table
Input the noise decibel N in i-th of car steering roomvWith ideal noise decibelDeviation e, deviation variation rate
Ec, exports the proportionality coefficient, proportion integral modulus and differential coefficient of PID, and proportionality coefficient, proportion integral modulus and differential coefficient are used
Height method carries out defuzzification, and input PID controller carries out the error compensation control of transmission shaft rotation angle, controls formula
Are as follows:
It is determined repeatedly through testing, fuzzy controller accurately controls the rotation angle, θ of transmission shaft, transmission shaft
The adduction for rotating the angular error offset of output angle and PID controller that angle, θ is fuzzy controller, makes the rotation of transmission shaft
Gyration is precisely controlled, and makes its deviation less than 0.1%.
When sound system in a vehicle is opened, control transmission shaft rotates counterclockwise so that the bottom surface of the double-deck pendulum leaf upward and with
The housing bottom surface is parallel.
The control method for the automobile cab sound absorber that the present invention designs and develops is provided with the double-deck pendulum leaf, being capable of basis
Whether sound system in a vehicle is closed and room noise is driven, and is rotated based on PID fuzzy Control transmission shaft, was both guaranteed
Driver's cabin sqouynd absorption lowering noise, in turn ensures automobile audio result of broadcast.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of automobile cab sound absorber characterized by comprising
Shell is the hollow rectangular parallelepiped structure of bottom opening；And
Multiple transmission shafts are arranged in the shell, and both ends are rotatably disposed in the shell radially opposite sides, and along described
The axial equidistant arrangement of shell；
Multiple double-deck pendulum leaves, are rectangular slab, and axial restraint is set on the transmission shaft respectively；
Power mechanism, and the transmission axis connection, for driving the transmission shaft to rotate；
Wherein, the top surface of the double-deck pendulum leaf is provided with sound-absorbing material layer and towards consistent, and bottom surface is provided with sound reflection layer；Just
When beginning position, the top and bottom of the double-deck pendulum leaf are vertical with the housing bottom surface, when the transmission shaft rotates clockwise 0
At~180 °, the top surface of the double-deck pendulum leaf gradually upward, when the transmission shaft rotates 0~180 ° counterclockwise, the bilayer
Put the bottom surface of leaf gradually upward；It is adjacent described double when the top surface of the double-deck pendulum leaf or the bottom surface housing bottom surface in parallel
The distance between the adjacent side of layer pendulum leaf is 0~5mm.
2. automobile cab sound absorber as described in claim 1, which is characterized in that the power mechanism includes:
Multiple driven wheels fix the both ends of the drive shaft being set in close to the inner walls；
Belt winds the driven wheel, for driving the driven wheel synchronous rotary；
Driving wheel, it is coaxially connected with any one of driven wheel, for driving the driven wheel to rotate；
Driving motor is fixedly installed on the housing, and output end is fixedly connected with the driving wheel, described for driving
Driving wheel rotation.
3. automobile cab sound absorber as claimed in claim 1 or 2, which is characterized in that further include sound-absorbing material block, set
It sets in the space that the housing top surface and the double-deck pendulum leaf surround, and is fixedly connected with the housing bottom surface.
4. automobile cab sound absorber as claimed in claim 3, which is characterized in that further include:
Fixed plate is fixed in the housing top surface；
Through-hole is arranged in the fixed plate, for being fixedly connected with automobile cab ceiling.
5. the automobile cab sound absorber as described in claim 1,2 or 4, which is characterized in that when the top of the double-deck pendulum leaf
Face or bottom surface in parallel the housing bottom surface when, the distance between adjacent side of the adjacent double-deck pendulum leaf is 0mm.
6. automobile cab sound absorber as claimed in claim 3, which is characterized in that further include:
Velocity sensor is arranged on vehicle body, for detecting speed；
Sound transducer is arranged in car steering room, for detecting the noise decibel in car steering room；
Angular transducer is arranged on the transmission shaft, for detecting the rotation angle of transmission shaft；
Controller is connect with the driving motor, for controlling the transmission shaft rotation.
7. a kind of control method of automobile cab sound absorber, which is characterized in that including fuzzy controller, when interior sound equipment system
When system is closed:
By the noise decibel N in car steering roomvFuzzy controller is inputted with automobile driving speed V, is made an uproar in the car steering room
Sound decibel NvIt is 7 grades with automobile driving speed V points；
The rotation angle, θ of fuzzy controller take-off (propeller) shaft, output are divided into 7 grades；
Noise decibel N in the car steering roomvFuzzy domain be [0,1], quantizing factor 84；The running car
The fuzzy domain of speed V is [0,1], quantizing factor 22；The fuzzy domain of the rotation angle, θ of take-off (propeller) shaft is [0,1], amount
Changing the factor is 180；
The fuzzy set output and input is { NB, NM, NS, 0, PS, PM, PB }.
8. the control method of automobile cab sound absorber as claimed in claim 7, which is characterized in that further include fuzzy
Controller:
Input the noise decibel N in i-th of car steering roomvWith ideal noise decibelDeviation, deviation variation rate, output
Proportionality coefficient, proportion integral modulus and the differential coefficient of PID, proportionality coefficient, proportion integral modulus and differential coefficient input PID control
Device processed carries out the error compensation control of transmission shaft rotation angle.
9. the control method of automobile cab sound absorber as claimed in claim 8, which is characterized in that
Noise decibel N in the car steering roomvWith ideal noise decibelDeviation e fuzzy domain be [- 1,1], amount
Changing the factor is 15；The fuzzy domain of the deviation variation rate ec is [- 3,3], quantizing factor 1；
The fuzzy domain of the proportionality coefficient of the output PID is [- 1,1], quantizing factor 0.1；The mould of proportion integral modulus
Pasting domain is [- 1,1], quantizing factor 0.1；The fuzzy domain of differential coefficient is [- 1,1], quantizing factor 0.0001；
The deviation e and deviation variation rate ec points are 7 grades；The output proportionality coefficient of PID, proportion integral modulus and micro-
Coefficient is divided to be divided into 7 grades；
The fuzzy set of the fuzzy controller output and input is { NB, NM, NS, 0, PS, PM, PB }.
10. the control method of the automobile cab sound absorber as described in claim 7,8 or 9, which is characterized in that when interior sound
When acoustic system is opened, control transmission shaft rotates counterclockwise, so that the bottom surface of the double-deck pendulum leaf is upward and parallel with housing bottom surface.
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| CN201811579281.5A CN109435866B (en) | 2018-12-24 | 2018-12-24 | Sound absorption device for automobile cab and control method thereof |
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| CN109435866B CN109435866B (en) | 2024-02-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111544012A (en) * | 2019-10-31 | 2020-08-18 | 华中科技大学同济医学院附属协和医院 | Restraint table for children jugular vein blood sampling and control method thereof |
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