CN109484416B - A high-speed train aerodynamic noise reduction system and method - Google Patents

Abstract

The invention discloses a kind of pneumatic noise reduction system of bullet train and method, which includes signal picker, controller and two air cannon generating devices；Signal picker is connect with controller, and the controller is also connect with two air cannon generating devices；Each air cannon generating device includes air stream transmitter, total air duct, the first supercharging equipment and the second supercharging equipment, and each supercharging equipment is connect by total air duct with the air inlet of air stream transmitter；First supercharging equipment and the second supercharging equipment are connect with controller.The present invention is based on air jets to the interference performance in boundary layer, pass through active noise reduction system under the premise of not changing train shape and material in conjunction with the aerodynamic characteristic in bullet train traveling process, improve train pneumatic characteristic, improves the comfort level and energy-saving safe of train.

Description

A high-speed train aerodynamic noise reduction system and method

technical field

The invention belongs to the technical field of rail transit, and in particular relates to a high-speed train aerodynamic noise reduction system and method.

Background technique

In the past 10 years, with the rapid development of my country's high-speed rail industry, the noise problem of high-speed trains has become more and more serious. According to related research, when the train speed is less than 315km/h, urban rail noise is the main noise source, and the noise is proportional to the 2.6th power of the train speed; when the train speed is greater than 315km/h, aerodynamic noise plays an absolute leading role , the aerodynamic noise is proportional to the seventh power of the train speed, therefore, the noise has become a problem that cannot be ignored restricting the speed of the train.

Existing approaches to noise reduction are mainly by optimizing the streamline of the car body and smoothing the doors, windows and compartments, while adding sound-insulating materials to the side walls to optimize the riding environment in the compartment. However, the existing noise reduction methods have limited effects. In fact, during the running of high-speed trains, the noise is closely related to the turbulent flow formed by the separation of laminar flow at the rear of the train. Therefore be badly in need of a kind of under the situation of not changing the profile of car at present, effectively reduce the method for the noise that train produces during high-speed operation.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the high-speed train aerodynamic noise reduction system and method provided by the present invention solve the problem that the existing high-speed train aerodynamic noise reduction method has limited effect and does not take into account the separation relationship between the generation of noise and the separation of the airflow layer at the front or rear of the train. question.

In order to achieve the purpose of the above invention, the technical solution adopted by the present invention is: a high-speed train pneumatic noise reduction system, including a signal collector, a controller and two air gun generators;

Both the signal collector and the air gun generating device are connected with the controller;

Each of the air gun generators includes an airflow launcher, a total airflow conduit, a first booster device and a second booster device, and each booster device passes through the intake air of the total airflow conduit and the airflow launcher. port connection;

Both the first boosting device and the second boosting device are connected to a controller.

Further, the signal collector includes several noise sensors and several beat-type pressure-sensitive sheets, and each of the noise sensors and beat-type pressure-sensitive sheets is connected to the controller; the noise sensor is arranged in each train car Inside, it is used to collect the noise generated by the airflow inside the carriage during the running of the train and upload it to the controller; the beat-type pressure-sensitive sheet is arranged on the outer surface of the top of each train carriage to collect the airflow outside the carriage during the running of the train Pressure distribution and upload to the controller;

The controller is arranged in the train control room, and controls the action of the air gun generating device according to the noise signal collected by the noise sensor and the airflow pressure signal collected by the beat-type pressure-sensitive sheet;

The two air gun generating devices are respectively arranged on the outer surface of the top of the train head and the outer surface of the rear top, and emit high-speed air flow according to the control signal of the controller to realize aerodynamic noise reduction.

Further, the first supercharging device and the second supercharging device have the same structure, and both include a cylinder, an exhaust fan, a motor, an air flow conduit, a one-way valve, a solenoid valve, a pressure sensor and two distance sensors;

The air inlet of the cylinder is connected with the air outlet of the exhaust fan, and the air outlet of the cylinder is connected with the total air flow conduit through the air flow conduit;

The one-way valve is arranged on the air inlet of the cylinder;

The solenoid valve is arranged on the air flow conduit;

Two distance sensors are respectively arranged on the top surface and the bottom surface of the piston rod of the cylinder, and the top of the piston rod is connected with the motor

The pressure sensor is arranged inside the cylinder;

The exhaust fan, electromagnetic valve, two distance sensors and pressure sensors are all connected with the controller, and the motor is connected with the controller through a driving circuit.

Further, the air flow launcher includes several air flow launch tubes arranged in parallel at equal intervals;

The air inlets of each of the air flow launch tubes are connected with the total air flow conduit;

The bottom of one end of the air inlet of the air flow emitter is fixed on the outer surface of the top of the train head or the outer surface of the rear of the train through a direction adjustment assembly;

The direction adjustment assembly includes an angle sensor, a mechanical steering gear and a steering drive motor, the angle sensor is arranged on the mechanical steering gear, the direction adjustment end of the mechanical steering gear is connected to the air flow emitter, and the mechanical steering gear The steering gear is connected with the controller through the steering drive motor.

Further, the controller is a STC12C5A60S2 series microcontroller;

Described noise sensor is TZ-2KA type noise sensor;

Both the motor and the steering drive motor are maxon DCX motors;

The main control chip model in the drive circuit is L298N;

The model of the pressure sensor is specifically FCC-200N;

The model of the distance sensor is specifically LP-50F;

The model of the angle sensor is specifically HAPS21.

A high-speed train aerodynamic noise reduction method, comprising the following steps:

S1. During the running of the train, it is judged whether the running speed of the train reaches the speed threshold for turning on the noise reduction system;

If yes, enter step S2;

Otherwise, go to step S4;

S2, turn on the noise reduction system, collect the noise signal in the compartment and the airflow pressure signal outside the compartment through the signal collector, and send it to the controller, and enter step S3;

S3. Analyzing the received control signal through the controller to determine whether separation of the airflow boundary layer occurs;

If yes, start the noise reduction system and enter step S5;

Otherwise, go to step S4;

S4. Continue to drive normally, and return to step S1;

S5. The air gun generating device is controlled by the controller to emit high-speed air flow to interfere with the noise air flow, so as to realize aerodynamic noise reduction.

Further, in step S5, the controller controlling the air gun generating device to emit the high-speed air flow includes controlling the generation and emission of the high-speed air flow and controlling the emission direction of the high-speed air flow.

Further, the method for controlling the generation and emission of high-speed air flow is as follows:

A1. Control the exhaust fan in the first supercharging device to work through the controller, so that air enters the cylinder;

A2. When the air in the cylinder is full, the controller controls the motor to drive the piston rod of the cylinder to perform air compression action, and at the same time, the controller opens the solenoid valve in the first booster device, so that the air flow enters the total air flow along the air flow conduit Duct, which in turn generates high-speed air flow, which is emitted through the air flow emitter;

A3. While the first supercharging device emits high-speed air flow, the controller controls the exhaust fan of the second supercharging device to inflate the cylinder;

When the piston rod of the cylinder in the first supercharging device touches the bottom of the cylinder for air compression, close the solenoid valve in the first supercharging device, and drive the piston rod of the cylinder in the first supercharging device to move upward through the motor; Simultaneously control the second supercharging device to generate and emit high-speed air flow;

A4. Steps A1-A3 are repeated, and the controller controls the first booster device and the second booster device to work alternately repeatedly, so as to realize the control of generating and emitting high-speed air flow.

Further, the method for controlling the emission direction of the high-speed air flow is as follows:

B1. Analyze the signal uploaded by the noise sensor and the beat-type pressure-sensitive sheet through the controller, and analyze the separation of the airflow boundary layer outside the train;

B2. According to the analyzed airflow boundary layer separation, the controller controls the steering drive motor to rotate the mechanical steering gear until the signal uploaded by the angle sensor reaches the target angle direction set by the controller, and the mechanical steering gear is controlled to stop The direction is rotated to realize the control of the emission direction of the high-speed air flow.

The beneficial effects of the present invention are: the high-speed train aerodynamic noise reduction system and method provided by the present invention, based on the interference ability of the air jet to the boundary layer, combined with the aerodynamic characteristics of the high-speed train during the running process, without changing the shape and material of the train , Through the active noise reduction system, the aerodynamic characteristics of the train are improved, and the comfort, safety and energy saving of the train are improved.

Description of drawings

Fig. 1 is a structural diagram of the aerodynamic noise reduction system for medium and high-speed trains of the present invention;

Fig. 2 is a schematic diagram of a signal amplification circuit in the present invention;

Fig. 3 is a structure diagram of the first supercharging device and the second supercharging device in the present invention;

Fig. 4 is a structural diagram of the air flow emitter in the present invention;

Fig. 5 is a flow chart of the aerodynamic noise reduction method for medium and high-speed trains of the present invention;

Fig. 6 is a schematic diagram of the flow direction of air flow when realizing aerodynamic noise reduction in the present invention;

Among them: 1. Signal collector; 2. Air gun generator; 3. Controller; 4. Air flow transmitter; 5. Total air flow duct; 6. Exhaust fan; 7. Motor; 8. Cylinder; 9. Piston Rod; 10, distance sensor; 11, pressure sensor; 12, air flow conduit; 13, solenoid valve; 14, air flow launch tube; 15, one-way valve.

Detailed ways

The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

As shown in Figure 1, a high-speed train pneumatic noise reduction system includes a signal collector 1, a controller 3 and two air gun generators 2;

Both the signal collector 1 and the air gun generating device 2 are connected to the controller 3;

Each air gun generating device 2 comprises an airflow launcher 4, a total airflow conduit 5, a first booster device and a second booster device, and each booster device passes through the total airflow conduit 5 and the airflow launcher 4 air inlet connection;

Both the first booster device and the second booster device are connected to the controller 3 .

Wherein, the signal collector 1 includes several noise sensors and several beat-type pressure-sensitive sheets, and each noise sensor and beat-type pressure-sensitive sheets are connected with the controller 3; the noise sensor is a capacitive sensor sensitive to sound built into the microphone. Electret microphone, the sound wave makes the electret film in the microphone vibrate, resulting in a change in capacitance, which generates a corresponding change in tiny voltage, so as to realize the conversion from acoustic signal to electrical signal; place the noise sensor in each car The middle part is used to collect the noise generated by the airflow inside the carriage during the running of the train. The sound signal is converted into a weak capacitive voltage signal and then output to the controller 3 through the signal amplifier circuit. The specific circuit structure of the signal amplifier circuit is shown in Figure 2 As shown, the common emitter amplifier circuit has the characteristics of large voltage amplification, current amplification and power amplification, small input resistance, large output resistance, and relatively moderate parameters. Paste pressure-sensing sheets on the pressure-measuring parts on the surface of the train, and then lead the small plastic tubes connected with each pressure-sensing sheet to the openings on the vehicle along the outer surface of the vehicle body, which can effectively replace the pressure-measuring holes without damaging the vehicle. On the surface of the body, the beat-type pressure-sensitive sheet is arranged on the outer surface of the top of each train car, and the airflow pressure signal outside the car during the train running is collected and uploaded to the controller 3 .

The controller 3 is arranged in the train control room, and the controller 3 can control the action of the air gun generating device 2 according to the noise signal collected by the noise sensor and the airflow pressure distribution collected by the beat-type pressure-sensitive sheet;

Two air gun generating devices 2 are respectively arranged on the outer surface of the top of the train head and the outer surface of the rear top, and emit high-speed air flow according to the control signal of the controller 3 to realize aerodynamic noise reduction.

As shown in Figure 3, the first supercharging device and the second supercharging device have the same structure, and both include a cylinder 8, an exhaust fan 6, a motor 7, an air flow conduit 12, a one-way valve 15, an electromagnetic valve 13, a pressure sensor 11 and two distance sensors 10;

The air inlet of cylinder 8 is connected with the air outlet of exhaust fan 6, and the air outlet of cylinder 8 is connected with total air flow conduit 5 through air flow conduit 12;

The one-way valve 15 is arranged on the air inlet of the cylinder 8. When the air in the cylinder 8 is full, the pressure generated by the piston rod 9 to the air inlet of the cylinder 8 will automatically close the one-way valve 15. It avoids that part of the air will go out from the air inlet of cylinder 8 when the air is compressed, which will affect the air flow emission effect;

The solenoid valve 13 is arranged on the air flow conduit 12. When the cylinder 8 generates and emits air flow, under the control of the controller 3, the solenoid valve 13 will automatically close or open to coordinate the work of the two supercharging devices, and more efficient generate and emit air streams;

Two distance sensors 10 are respectively arranged on the top surface and the bottom surface of the piston rod 9 of the cylinder 8, and the top of the piston rod 9 is connected with the motor 7; the distance sensor 10 at the top of the piston rod 9 detects the distance from the top of the piston rod 9 to the upper surface of the cylinder 8 When a change occurs, the controller 3 controls the solenoid valve 13 to open and starts to emit air flow. When the distance sensor 10 at the bottom of the piston rod 9 detects that the bottom of the piston rod 9 touches the inner lower surface of the cylinder 8, the controller 3 controls the motor 7 to drive the piston The rod 9 returns to its original position, and the electromagnetic valve 13 is closed to end the air flow emission of the current supercharging device;

The pressure sensor 11 is arranged inside the cylinder 8, and is used to detect the air pressure in the cylinder 8, and then judge whether the air in the cylinder 8 is full;

Blower 6, electromagnetic valve 13, two distance sensors 10 and pressure sensor 11 sensors are all connected with controller 3, and motor 7 is connected with controller 3 through drive circuit.

As shown in Figure 4, the air flow launcher 4 includes several air flow launch tubes 14 arranged in parallel, and a certain distance is spaced between adjacent two air flow launch tubes 14, so as to adjust the emission angle of the air flow;

The air inlet of each airflow launching tube 14 is all connected with total airflow conduit 5;

The bottom of one end of the air inlet of the air flow launcher 4 is fixed on the outer surface of the top of the train head or the outer surface of the top of the rear of the train through a direction adjustment assembly;

The direction adjustment assembly includes an angle sensor, a mechanical steering gear and a steering drive motor. The angle sensor is arranged on the mechanical steering gear. The direction adjustment end of the mechanical steering gear is connected to the air flow emitter 4. The mechanical steering gear drives the motor through steering Connect with controller 3. The controller 3 analyzes the environmental signal collected by the signal collector 1, and then determines the angle and direction of emitting air flow to achieve the best noise reduction effect.

The above-mentioned controller 3 is a STC12C5A60S2 series single-chip microcomputer, which has high-speed, low power consumption and anti-interference functions. It contains a high-speed 10-bit analog-to-digital conversion unit inside, so there is no need to add an additional analog-to-digital converter to process data. At the same time, it has a large The capacity of the storage space is convenient for the chip to compare and judge the collected data.

The chip of described drive motor is L298N chip, adopts the beneficial point of this chip to be: L298N principle is similar to H-bridge drive circuit, easy to install, can realize the positive and negative rotation of drive motor and motor speed regulation;

The noise sensor is TZ-2KA noise sensor, which is a noise sensor with wide audio frequency range, high sound intensity dynamic range, and easy operation; the sensor is small in size, light in weight, flexible in installation, and its audio frequency measurement range covers All frequencies that the human ear can hear (20-20KHz);

Both the motor and the steering drive motor are maxon DCX motors, which have a stable speed and a wide range of configured diameters;

The model of the pressure sensor is specifically the FCC-200N pressure sensor, which has the advantages of small size, easy installation, and accurate measurement accuracy;

The model of the distance sensor is LP-50F linear distance sensor, which is a high-precision conductive plastic sensor with high resolution and high mechanical strength of the shell, suitable for working under high pressure;

The model of the angle sensor is specifically the HAPS21 angle sensor, which is a hollow and ultra-thin sensor that is easy to install and can work in a high-pressure environment.

As shown in Fig. 5, the present invention also provides a kind of high-speed train aerodynamic noise reduction method, comprises the following steps:

S1. During the running of the train, it is judged whether the running speed of the train reaches the speed threshold for turning on the noise reduction system;

If yes, enter step S2;

Otherwise, go to step S4;

S2. Turn on the noise reduction system, collect the noise signal in the compartment and the airflow pressure signal outside the compartment through the signal collector, and send it to the controller, and enter step S3;

S3. Analyzing the received control signal through the controller to determine whether separation of the airflow boundary layer occurs;

If yes, start the noise reduction system and enter step S5;

Otherwise, go to step S4;

S4. Continue to drive normally, and return to step S1;

S5. The controller controls the air gun generating device to emit high-speed air flow to interfere with the noise air flow, so as to realize aerodynamic noise reduction;

Figure 6 shows the flow direction of air flow when aerodynamic noise reduction is realized;

In the above step S5, the controller controlling the air gun generating device to emit the high-speed air flow includes controlling the generation and emission of the high-speed air flow and controlling the emission direction of the high-speed air flow;

Among them, the method of controlling the generation and emission of high-speed air flow is as follows:

A1. Control the exhaust fan in the first supercharging device to work through the controller, so that air enters the cylinder;

A2. When the air in the cylinder is full, the controller controls the motor to drive the piston rod of the cylinder to perform air compression action, and at the same time, the controller opens the solenoid valve in the first booster device, so that the air flow enters the total air flow along the air flow conduit Duct, which in turn generates high-speed air flow, which is emitted through the air flow emitter;

A3. While the first supercharging device emits high-speed air flow, the controller controls the exhaust fan of the second supercharging device to inflate the cylinder;

When the piston rod of the cylinder in the first supercharging device touches the bottom of the cylinder for air compression, close the solenoid valve in the first supercharging device, and drive the piston rod of the cylinder in the first supercharging device to move upward through the motor; Simultaneously control the second supercharging device to generate and emit high-speed air flow;

A4. Steps A1-A3 are repeated, and the controller controls the first booster device and the second booster device to work alternately repeatedly, so as to realize the control of generating and emitting high-speed air flow.

In the process of realizing the above-mentioned control of the generation and emission of high-speed air flow, the controller will analyze the environmental signal uploaded by the signal collector, determine the flow velocity of the air flow to be generated, and control the speed of the motor, and then control the piston rod to perform air compression The speed of the control is achieved to control the speed of the launch air flow.

The method for controlling the emission direction of the high-speed air flow is as follows:

B1. Analyze the signal uploaded by the noise sensor and the beat-type pressure-sensitive sheet through the controller, and analyze the separation of the airflow boundary layer outside the train;

B2. According to the analyzed airflow boundary layer separation, the controller controls the steering drive motor to rotate the mechanical steering gear until the signal uploaded by the angle sensor reaches the target angle direction set by the controller, and the mechanical steering gear is controlled to stop The direction is rotated to realize the control of the emission direction of the high-speed air flow.

The beneficial effects of the present invention are: the high-speed train aerodynamic noise reduction system and method provided by the present invention, based on the interference ability of the air jet to the boundary layer, combined with the aerodynamic characteristics of the high-speed train during the running process, without changing the shape and material of the train , Through the active noise reduction system, the aerodynamic characteristics of the train are improved, and the comfort, safety and energy saving of the train are improved.

Claims (8)

1. A high-speed train pneumatic noise reduction system is characterized in that, comprising signal collector (1), controller (3) and two air gun generating devices (2); Both the signal collector (1) and the air gun generating device (2) are connected with the controller (3); Each said air gun generating device (2) comprises an air flow emitter (4), a total air flow conduit (5), a first booster device and a second booster device, and each booster device passes through the total air flow Conduit (5) is connected with the air inlet of air flow emitter (4); Both the first booster device and the second booster device are connected to the controller (3); The signal collector (1) includes several noise sensors and several beat-type pressure-sensitive sheets, each of which is connected to the controller (3); the noise sensor is arranged on each Inside the carriage of a train, it is used to collect the noise generated by the airflow inside the carriage during the running of the train and upload it to the controller (3); During the process, the airflow pressure distribution outside the compartment is uploaded to the controller (3); The controller (3) is arranged in the train control room, and controls the action of the air gun generating device (2) according to the noise signal collected by the noise sensor and the airflow pressure signal collected by the beat-type pressure-sensitive sheet; The two air gun generating devices (2) are respectively arranged on the outer surface of the top of the train head and the outer surface of the rear of the train, and emit high-speed air flow according to the control signal of the controller (3) to realize aerodynamic noise reduction. 2. The high-speed train aerodynamic noise reduction system according to claim 1, characterized in that, The first supercharging device and the second supercharging device have the same structure, and both include a cylinder (8), an exhaust fan (6), a motor (7), an air flow conduit (12), a one-way valve (15), an electromagnetic valve (13), pressure sensor (11) and two distance sensors (10); The air inlet of described cylinder (8) is connected with the air outlet of exhaust fan (6), and the air outlet of described cylinder (8) is connected with total air flow conduit (5) by air flow conduit (12); Described one-way valve (15) is arranged on the air inlet of cylinder (8); The solenoid valve (13) is arranged on the air flow conduit (12); Two distance sensors (10) are respectively arranged on the top surface and the bottom surface of the piston rod (9) of the cylinder (8), and the top of the piston rod (9) is connected with the motor (7); The pressure sensor (11) is arranged inside the cylinder (8); Described exhaust fan (6), solenoid valve (13), two distance sensors (10) and pressure sensor (11) are all connected with controller (3), and described motor (7) is connected with controller (3) by drive circuit. )connect. 3. The high-speed train aerodynamic noise reduction system according to claim 2, characterized in that, the air flow launcher (4) comprises several air flow launch tubes (14) arranged in parallel at equal intervals; The air inlet of each described airflow launching tube (14) is all connected with total airflow conduit (5); The bottom of one end of the air inlet of the air flow launcher (4) is fixed on the outer surface of the top of the train head or the outer surface of the top of the rear of the train through a direction adjustment assembly; The direction adjustment assembly includes an angle sensor, a mechanical steering gear and a steering drive motor, the angle sensor is arranged on the mechanical steering gear, and the direction adjustment end of the mechanical steering gear is connected to the air flow emitter (4), The mechanical steering gear is connected with the controller (3) through a steering drive motor. 4. The pneumatic noise reduction system for high-speed trains according to claim 3, wherein said controller (3) is a STC12C5A60S2 series single-chip microcomputer; Described noise sensor is TZ-2KA type noise sensor; Described motor (7) and steering drive motor are all maxon DCX motors; The main control chip model in the drive circuit is L298N; The model of the pressure sensor (11) is specifically FCC-200N; The model of described distance sensor (10) is specifically LP-50F; The model of the angle sensor is specifically HAPS21. 5. a high-speed train aerodynamic noise reduction method, is characterized in that, comprises the following steps: S1. During the running of the train, it is judged whether the running speed of the train reaches the speed threshold for turning on the noise reduction system; If yes, enter step S2; Otherwise, go to step S4; S2, turn on the noise reduction system, collect the noise signal in the compartment and the airflow pressure signal outside the compartment through the signal collector, and send it to the controller, and enter step S3; S3. Analyzing the received control signal through the controller to determine whether separation of the airflow boundary layer occurs; If yes, start the noise reduction system and enter step S5; Otherwise, go to step S4; S4. Continue to drive normally, and return to step S1; S5. The air gun generating device is controlled by the controller to emit high-speed air flow to interfere with the noise air flow, so as to realize aerodynamic noise reduction. 6. The aerodynamic noise reduction method for high-speed trains according to claim 5, wherein in the step S5, the controller controls the air gun generating device to emit high-speed air flow, including controlling the generation and emission of high-speed air flow and controlling the high-speed air flow direction of emission. 7. The aerodynamic noise reduction method for high-speed trains according to claim 6, wherein the method for controlling the generation and emission of high-speed air flow is specifically: A1. Control the exhaust fan in the first supercharging device to work through the controller, so that air enters the cylinder; A2. When the air in the cylinder is full, the controller controls the motor to drive the piston rod of the cylinder to perform air compression action, and at the same time, the controller opens the solenoid valve in the first booster device, so that the air flow enters the total air flow along the air flow conduit Duct, which in turn generates high-speed air flow, which is emitted through the air flow emitter; A3. While the first supercharging device emits high-speed air flow, the controller controls the exhaust fan of the second supercharging device to inflate the cylinder; When the piston rod of the cylinder in the first supercharging device touches the bottom of the cylinder for air compression, close the electromagnetic valve in the first supercharging device, and drive the piston rod of the cylinder in the first supercharging device to move upward through the motor; Simultaneously control the second supercharging device to generate and emit high-speed air flow; A4. Steps A1-A3 are repeated, and the controller controls the first booster device and the second booster device to work alternately repeatedly, so as to realize the control of generating and emitting high-speed air flow. 8. The aerodynamic noise reduction method for high-speed trains according to claim 6, wherein the method for controlling the emission direction of high-speed air flow is specifically: B1. Analyze the signal uploaded by the noise sensor and the beat-type pressure-sensitive sheet through the controller, and analyze the separation of the airflow boundary layer outside the train; B2. According to the analyzed airflow boundary layer separation, the controller controls the steering drive motor to rotate the mechanical steering gear until the signal uploaded by the angle sensor reaches the target angle direction set by the controller, and the mechanical steering gear is controlled to stop The direction is rotated to realize the control of the emission direction of the high-speed air flow.