CN109911019B - Active vortex control-based pneumatic noise reduction automobile A column device and control method thereof - Google Patents
Active vortex control-based pneumatic noise reduction automobile A column device and control method thereof Download PDFInfo
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Abstract
The invention discloses a pneumatic noise reduction automobile A column device based on active vortex control, which comprises: a column A, which is provided with a plurality of mounting holes at equal distance along the length direction; a plurality of vortex generators disposed within and penetrating the mounting hole; the connecting rod is arranged on the inner side of the A column and fixedly connected with one end of the vortex generator; the two groups of screw rod modules drive the connecting rod to move up and down relative to the surface of the A column; and the PLC is connected with the screw rod module. According to the invention, the heights of a plurality of vortex generators relative to the surface of the A column are controlled through the two pairs of screw rod modules, so that pneumatic noise reduction based on the vortex generators is realized. The invention also provides a control method of the pneumatic noise reduction automobile A column device based on active vortex control, which is characterized in that the real-time speed is acquired through an automobile speed sensor, the height of the surface of the A column is controlled according to the real-time speed, and dynamic noise reduction is realized.
Description
Technical Field
The invention relates to the field of aerodynamic noise reduction, in particular to a pneumatic noise reduction automobile A column device based on active vortex control and a control method thereof.
Background
With the development of economy, the automobile industry has developed rapidly, and automobiles have become the most convenient vehicle at present. However, with the increase of the holding amount and the increase of the vehicle speed, the pneumatic noise generated during the running of the vehicle is larger and larger, and the riding comfort and the running safety of the vehicle are seriously affected. Researchers and automobile manufacturers now pay more and more attention to analysis and control of aerodynamic noise in automobiles.
The aerodynamic noise is noise generated by turbulent flow caused by separation of air flow when the air flow passes through the bulge on the surface of the automobile body during running of the automobile. Research shows that the pneumatic noise sources of the automobile are mainly parts such as an engine cover, a front automobile body bottom plate, a front side window, a rear window and the like. In the high frequency range, the front window region is a major source of noise for the driver, since the airflow forms long wake vortices in this region, causing severe pressure pulsations at the side window surface. Therefore, the flow field in the area is effectively combed, so that the aerodynamic noise level is reduced, and the method has great significance in improving the riding comfort and the driving safety of the automobile.
The vortex control is to adopt a method for improving vortex to achieve the aim of carding a flow field aiming at a vortex generating area, and a structure for passively controlling vortex is arranged in the vortex generating area, wherein the structure for passively controlling vortex is a common method and is called a vortex generator. The current vortex control is widely applied in the aviation field and rarely applied in the automobile field.
At present, most automobiles adopt an automobile A column structure with smooth surfaces, the flow field in the front side window area cannot be effectively combed, strong pneumatic noise can be generated when the automobiles run at high speed, and the riding comfort and the running safety of the automobiles are seriously affected. In addition, the non-smooth surface has the A column structure of certain pneumatic noise reduction effect, and its structure is fixed, can't realize the optimization to the car external flow field carding effect when the car is traveling at different speed high speed, and its pneumatic noise reduction effect is very limited, and can increase the pneumatic noise of car on the contrary when the car is traveling at low speed.
Research shows that vortex generators with the same size parameters have different effects of reducing airflow separation and improving vortex under different flow field speeds, the vortex generators have different carding effects on the flow field under different flow field environments, and when the flow field speed is lower, the height of the vortex generators exposed in the flow field is overlarge, so that the automobile noise can be increased; when the flow field speed is higher, the height of the vortex generator exposed in the flow field should be properly increased to keep the vortex generator to have the best carding effect on the flow field along with the increase of the flow field speed.
Disclosure of Invention
The invention provides a pneumatic noise reduction automobile A column device based on active vortex control, which aims to solve the defects of the prior art and realizes pneumatic noise reduction based on vortex generators by controlling the heights of a plurality of vortex generators relative to the surface of an A column through two pairs of screw rod modules.
The invention also provides a control method of the pneumatic noise reduction automobile A column device based on active vortex control, which is characterized in that the real-time speed is acquired through an automobile speed sensor, and the height of the surface of the A column is controlled according to the real-time speed, so that pneumatic noise reduction is realized.
The technical scheme provided by the invention is as follows: an active vortex control based pneumatic noise reduction automotive a-pillar device comprising:
a column A, which is provided with a plurality of mounting holes at equal distance along the length direction;
a plurality of vortex generators disposed within and penetrating the mounting hole;
the connecting rod is arranged on the inner side of the A column and is fixedly connected with one end of the vortex generator;
the two groups of screw rod modules drive the connecting rod to move up and down relative to the surface of the A column;
and the controller is connected with the screw rod module.
Preferably, the screw module includes:
the base is provided with a groove on one side surface, and slide rails are arranged on two sides of the groove;
a motor disposed within the recess;
the screw rod is connected with the output shaft of the motor;
the screw nut is matched with the screw rod, and the screw nut is fixedly connected with the connecting rod.
Preferably, the method further comprises:
the sliding rail is arranged on the upper surface of the base and positioned at two sides of the groove;
the middle part of the sliding block is fixedly connected with the screw nut, and two ends of the sliding block are slidably matched in the sliding rail.
Preferably, the method further comprises:
the vehicle speed sensor is arranged at the output end of the automobile gearbox;
and the shaping amplifier is arranged beside the vehicle speed sensor and is connected with the vehicle speed sensor and the controller.
It is preferred that the composition of the present invention,
a sealing ring is arranged at the inner side of the mounting hole, and a slotted bushing is arranged below the mounting hole;
wherein the vortex generator is disposed within the slot.
It is preferred that the composition of the present invention,
the length of the bottom of the vortex generator is 34.5-35.5 mm, the width of the vortex generator is 4.7-5.3 mm, and the height of the vortex generator is 7.0-8.0 mm.
A control method of a pneumatic noise reduction automobile A column device based on active vortex control comprises the following steps:
acquiring real-time speed information of the automobile according to a speed sensor;
the PLC controls the screw rod module according to real-time vehicle speed information, and the height of the vortex generator relative to the outer surface of the A column is adjusted.
Preferably, the method further comprises:
when the vehicle speed v satisfies v < 70, the height of the vortex generator is maintained to satisfy h=h 0 Wherein h is 0 Is the initial height of the vortex generator;
when the vehicle speed v is more than or equal to 70 and less than or equal to 9,0 adjusts the height of the vortex generator to be more than or equal to 2.5mm and less than or equal to 3.5mm;
when the speed v of the vehicle is more than 90 and less than or equal to 11,0, the height of the vortex generator is adjusted to be more than or equal to 4.5mm and less than or equal to h and less than or equal to 5.5mm;
when the vehicle speed v is more than 110, the height of the vortex generator is adjusted to be more than 6mm and less than or equal to 7mm.
It is preferred that the composition of the present invention,
when the vehicle speed v is more than or equal to 70 and less than or equal to 90, the height of the vortex generator is controlled to be more than or equal to 90:
wherein f is a correction coefficient, H is the self height of the vortex generators, n is the number of the vortex generators, L 1 The length of the bottom of the vortex generator is W, the width of the bottom of the vortex generator is W, P is the rated power of the motor, N is the rated rotating speed of the motor, and h 0 Is the initial height of the vortex generator.
It is preferred that the composition of the present invention,
the initial height h 0 ＝2.0mm。
The beneficial effects of the invention are as follows: 1) According to the invention, real-time vehicle speed is acquired through the vehicle speed sensor in the running process of the vehicle, and the heights of the vortex generators relative to the surface of the A column are controlled through the two pairs of screw rod modules, so that pneumatic noise reduction based on the vortex generators is realized. The A column of the automobile controls the heights of a plurality of vortex generators relative to the surface of the A column according to the real-time speed, so that the carding effect of the A column on the front side window area flow field is matched with the real-time environment condition of the flow field, the optimization of the pneumatic noise reduction effect of the front side window area is realized, and the riding comfort and the driving safety of the automobile are improved; 2) The device can be widely applied to various vehicle types, has wide application range and higher reliability, and can meet the requirements of users; 3) The vortex generators are arranged on the surface of the A column of the automobile, so that the technological sense and artistic sense of the whole automobile are improved.
Drawings
Fig. 1 is a schematic structural diagram of a pneumatic noise reduction automobile a-pillar device based on active vortex control.
FIG. 2 is a schematic view of the structure of the lever module of the present invention.
Fig. 3 is a circuit diagram of the shaping amplifier of the present invention.
Fig. 4 is a front view of the vortex generator of the present invention.
Fig. 5 is a left side view of the vortex generator of the present invention.
Fig. 6 is a top view of the vortex generator of the present invention.
Fig. 7 is a control flow chart of the optimization control device of the pneumatic noise reduction automobile A column structure based on active vortex control.
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, the pneumatic noise reduction automobile a-pillar device based on active vortex control of the present invention comprises: the automobile A column 100 is provided with a plurality of mounting holes at equal intervals from top to bottom on an upper plate; the vortex generators 110 are installed at the installation holes of the A column of the automobile, penetrate through the installation holes and can move up and down in the holes, and when the vortex generators are lifted relative to the surface of the A column, the vortex generators have good carding effect on the out-flow field of the automobile, so that pneumatic noise of the front side window area of the automobile can be effectively reduced. The connecting rod 130 is disposed inside the a-pillar and is fixedly connected to one end of the turbo generator 110. Two pairs of screw modules 150 drive the links 130 up and down relative to the a-pillar surface. The PLC controller 140 is connected to control the screw module.
The automobile speed sensor is arranged at the output shaft of the automobile gearbox and beside the automobile speed sensor. The automobile speed sensor is a Hall effect type sensor and is connected with the input end of the PLC through a shaping amplifier.
The input end of the PLC is connected with the automobile speed sensor, the output end of the PLC is connected with the two pairs of screw module signal receivers, the PLC obtains real-time automobile speed signals through the automobile speed sensor, and the output signals control the two pairs of screw module sliding blocks to move so as to control the lifting of the vortex generators. The automobile speed sensor is connected with the input end of the PLC 140 through a shaping amplifier, so that the pulse signal is amplified and shaped and then transmitted to the PLC 140 for processing.
As shown in fig. 2, the screw module 150 includes a base 151, a groove is formed on one side of the base 151, and sliding grooves 155 are formed on two sides of the groove. The motor 152 is arranged in the groove, an output shaft of the motor 152 is connected with a screw rod 153, a screw rod nut 154 is matched with the screw rod 153, and the screw rod nut 154 is fixedly connected with the connecting rod 130.
In another embodiment, the bottom of the slider 156 is fixedly connected to the screw nut 154, two ends of the slider 156 are matched in the sliding groove 155, and the slider can slide up and down along the sliding groove 155 along with the movement of the screw nut 154. The sealing ring 120 is arranged at the inner side of the mounting hole, the slotted bushing 160 is arranged at the lower part, and dirt and the like can be prevented from entering the A column by the slotted bushing 160 and the sealing ring 120, and the vortex generator can move stably up and down.
The size parameters of the mounting hole are as follows: the bottom is 36.5-37.5 mm long, the width is 6.7-7.3 mm, the two ends are semicircles, and the radius of the semicircles is 3.35-3.65 mm. The distance between the adjacent mounting holes is 9.5-10.5 mm.
The dimensional parameters of the seal ring 120 are: the bottom is 36.5-37.5 mm long, the width is 6.7-7.3 mm, the two ends are semicircle, the radius R of the semicircle is 3.35-3.65 mm, the height is 2mm, and the thickness is 4mm.
As shown in fig. 4-6, the dimensional parameters of the vortex generators are: the length L1 of the bottom is 34.5-35.5 mm, the width W is 4.7-5.3 mm, the overall height H is 7.0-8.0 mm, the two sides of the top are in fillet transition, the fillet radius R1 is 4.8-5.2 mm, the central angle corresponding to an arc is 90 degrees, the two long sides of the top are in fillet transition, the fillet radius R2 is 2.4-2.6 mm, and the central angle corresponding to an arc is 90 degrees. The vortex generators are arranged in parallel at equal intervals in the length direction of the A column, and the interval between the adjacent vortex generators is 9.5-10.5 mm.
The bottoms of the vortex generators are connected with the connecting rod in a welding mode, and when the connecting rod is displaced, the vortex generators are also displaced equally. The output shaft of motor and lead screw welded connection, when the output shaft of motor produced the rotation, the lead screw also produced equal rotation, and the lead screw nut can produce corresponding displacement along lead screw length direction, and lead screw nut and slider welded connection, the slider produced equal displacement along slide rail direction when the lead screw nut produced the displacement. And the displacement range of the two pairs of screw module sliding blocks in the direction of the sliding rail is limited to be between 0 and 5 mm.
The automobile speed sensor is a Hall effect type sensor, can meet the requirements of quick response and sensitivity, is a basic sensor of an electronic system equipped with an automobile, and particularly, when the automobile runs at a certain speed, the automobile speed is equal to the automobile speed when the wheels rotate for one circleThe sensor outputs a pulse signal with the frequency in direct proportion to the rotation speed of the wheels, and the pulse number in unit time is calculated through a counter of the PLC controller, so that the real-time speed of the automobile can be obtained; the automobile speed sensor is connected with the input end of the PLC through a shaping amplifier, so that pulse signals are amplified and shaped and then transmitted to the PLC for processing, wherein in the embodiment, the shaping amplifier consists of 1 operational amplifier, 1 shaping integrated circuit and a plurality of capacitors and resistors, and the specific view is shown in fig. 3; the shaping amplifier comprises 1 operational amplifier circuit and 1 shaping integrated circuit, the operational amplifier circuit comprises 1 operational amplifier 210 and 1 potentiometer VR 1 And resistance R 1 、R 2 、R 3 The shaping integrated circuit is composed of power VCC, 74LS32 four 2 input OR gate 220 and diode D 1 、D 2 Resistance R 4 、R 5 、R 6 Composition, U x Is a signal input end, and is processed by an operational amplifying circuit to obtain a signal U x '＝(R 1 ×VCC+U x (R 3 +VR 1 +R 4 ))/R 1 ×R 4 Then the output signal U is obtained after the shaping integrated circuit is subjected to the truing treatment 0 ，U 0 ＝βU x Wherein beta is an amplification factor, the value of which is represented by the potentiometer VR 1 And (5) determining. The PLC outputs an electric signal to the two pairs of screw rod modules according to the vehicle speed signal of the input end, so that the displacement of the sliding blocks of the screw rod modules is controlled, the heights of the vortex generators relative to the surface of the A column are controlled, and the pneumatic noise reduction effect of the vortex generators is controlled to be optimal.
The invention also provides a control method of the pneumatic noise reduction automobile A column device based on active vortex control, which comprises the following steps:
step one, acquiring real-time speed signals of an automobile according to a basic sensor Hall effect type automobile speed sensor of an electronic system equipped in the automobile;
acquiring real-time speed signals of an automobile by adopting a PLC (programmable logic controller) according to an automobile speed sensor, outputting control signals to two pairs of screw modules, and controlling the sliding blocks of the two pairs of screw modules to slide to a proper position;
and thirdly, dynamically controlling the heights of the vortex generators relative to the surface of the A column by utilizing two pairs of screw module sliding blocks.
When the real-time speed signal of the automobile is between a preset value 1 (70 m/s) and a preset value 2 (90 m/s), controlling a plurality of vortex generators to rise to a preset height 1 (2.5-3.5 mm); when the real-time speed signal of the automobile is between a preset value 2 (90 m/s) and a preset value 3 (110 m/s), controlling a plurality of vortex generators to rise to a preset height 2 (4.5-5.5 mm); when the real-time speed signal of the automobile exceeds a preset value of 3 (110 m/s), controlling a plurality of vortex generators to rise to a preset height of 3 (6-7 mm); when the real-time vehicle speed signal of the automobile is lower than a preset value of 1 (70 m/s), the control is performed so that the vortex generators are lowered to an initial height (2 mm). The height control of a plurality of vortex generators relative to the surface of the A column is utilized, the vortex generators have good carding effect on the vehicle outflow field at different vehicle speeds, and then the pneumatic noise of the front side window area of the vehicle is effectively reduced.
The regulation rule is as follows:
when the vehicle speed v satisfies v < 70, the height of the vortex generator is maintained to satisfy h=h 0 Wherein h is 0 Is the initial height of the vortex generator;
when the vehicle speed v is more than or equal to 70 and less than or equal to 9,0 adjusts the height of the vortex generator to be more than or equal to 2.5mm and less than or equal to 3.5mm;
when the speed v of the vehicle is more than 90 and less than or equal to 11,0, the height of the vortex generator is adjusted to be more than or equal to 4.5mm and less than or equal to h and less than or equal to 5.5mm;
when the vehicle speed v is more than 110, the height of the vortex generator is adjusted to be more than 6mm and less than or equal to 7mm.
When the vehicle speed v is more than or equal to 70 and less than or equal to 90, the height of the vortex generator is controlled to be more than or equal to 90:
wherein f is a correction coefficient, and the numerical value is 0.98; h is the self height of the vortex generator, and the unit is mm; n is the number of vortex generators, L 1 The length of the bottom of the vortex generator is in mm; w is the bottom width of the vortex generatorThe unit is mm; p is the rated power of the motor, and the unit is W; n is the rated rotation speed of the motor, and the unit is r/min; h is a 0 Is the initial height of the vortex generator in mm. The initial height h 0 ＝2.0mm。
According to the invention, the real-time speed is acquired through the automobile speed sensor in the running process of the automobile, the heights of the vortex generators relative to the surface of the A column are controlled through the two pairs of screw rod modules, so that the heights of the vortex generators relative to the surface of the A column are controlled according to the real-time speed, the carding effect of the vortex generators on the front side window area flow field is matched with the real-time environmental condition of the flow field, the optimization of the pneumatic noise reduction effect on the front side window area when the automobile runs at different speeds is realized, and the riding comfort and the running safety of the automobile are improved.
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 pneumatic noise reduction automobile A column device based on the active vortex control is characterized by comprising the following steps of:
a column A, which is provided with a plurality of mounting holes at equal distance along the length direction;
a plurality of vortex generators disposed within and penetrating the mounting hole;
the connecting rod is arranged on the inner side of the A column and is fixedly connected with one end of the vortex generator at the same time;
the two groups of screw rod modules drive the connecting rod to move up and down relative to the surface of the A column;
the controller is connected with the screw rod module;
the control method of the pneumatic noise reduction automobile A column device based on active vortex control comprises the following steps:
acquiring real-time speed information of the automobile according to a speed sensor;
the PLC controls the screw rod module according to the real-time vehicle speed information, and adjusts the height of the vortex generator relative to the outer surface of the A column;
when the vehicle speed v satisfies v < 70, the height of the vortex generator is maintained to satisfy h=h 0 Wherein h is 0 Is the initial height of the vortex generator;
when the speed v of the vehicle is more than or equal to 70 and less than or equal to 90, the height of the vortex generator is adjusted to be more than or equal to 2.5mm and less than or equal to 3.5mm;
wherein,
wherein f is a correction coefficient, H is the self height of the vortex generators, n is the number of the vortex generators, L 1 The length of the bottom of the vortex generator is W, the width of the bottom of the vortex generator is W, P is the rated power of the motor, N is the rated rotating speed of the motor, and h 0 Is the initial height of the vortex generator;
when the speed v of the vehicle is smaller than or equal to 90 and smaller than or equal to 110, the height of the vortex generator is adjusted to be smaller than or equal to 4.5mm and smaller than or equal to h and smaller than or equal to 5.5mm;
when the vehicle speed v is more than 110, the height of the vortex generator is adjusted to be more than 6mm and less than or equal to 7mm.
2. The control method of the pneumatic noise reduction automobile a-pillar device based on the active vortex control according to claim 1, wherein the screw module comprises:
the base is provided with a groove on one side surface, and slide rails are arranged on two sides of the groove;
a motor disposed within the recess;
the screw rod is connected with the output shaft of the motor;
and the screw nut is matched with the screw rod, and the screw nut is fixedly connected with the connecting rod.
3. The control method of the active vortex control-based pneumatic noise reduction automobile a-pillar device according to claim 2, further comprising:
the sliding rail is arranged on the upper surface of the base and positioned at two sides of the groove;
the middle part of the sliding block is fixedly connected with the screw nut, and two ends of the sliding block are slidably matched in the sliding rail.
4. The control method of the pneumatic noise reduction automobile a-pillar device based on the active vortex control according to claim 3, further comprising:
a vehicle speed sensor provided at an output shaft of the automobile transmission;
and the shaping amplifier is arranged beside the vehicle speed sensor and is connected with the vehicle speed sensor and the controller.
5. The method for controlling an active vortex control-based pneumatic noise reduction automobile A-pillar device according to claim 4, wherein,
a sealing ring is arranged at the inner side of the mounting hole, and a slotted bushing is arranged below the mounting hole;
wherein the vortex generator is disposed within the slotted liner.
6. The method for controlling an active vortex control-based pneumatic noise reduction automobile A-pillar device according to claim 5, wherein,
the length of the bottom of the vortex generator is 34.5-35.5 mm, the width of the vortex generator is 4.7-5.3 mm, and the height of the vortex generator is 7.0-8.0 mm.
7. The method for controlling a pneumatic noise reduction automobile A-pillar device based on active vortex control according to claim 6, wherein,
the initial height h 0 ＝2.0mm。
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| CN113793587B (en) * | 2021-11-16 | 2022-02-11 | 中国空气动力研究与发展中心计算空气动力研究所 | Noise reduction method based on vortex array |
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| CN107031742A (en) * | 2017-04-28 | 2017-08-11 | 重庆长安汽车股份有限公司 | A kind of column flow-guiding structure and automobile |
| CN208134281U (en) * | 2018-05-07 | 2018-11-23 | 吉林大学 | Active safety air-bag control device based on human bioequivalence |
| CN109484139A (en) * | 2018-10-31 | 2019-03-19 | 清华大学苏州汽车研究院（相城） | A kind of automotive back window wind shake noise reducer and control method |
| CN109367633A (en) * | 2018-11-15 | 2019-02-22 | 盐城市华悦汽车部件有限公司 | A kind of automobile stand column flow-guiding structure |
| CN209700792U (en) * | 2019-04-01 | 2019-11-29 | 吉林大学 | A kind of pneumatic noise reduction automobile A column device based on active vortex control |
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