38 results about "Wave oscillation" patented technology

The invention relates to a seabed elastic parameter inversion method, system and device under an earthquake spherical reflection wave oscillation-gradual change nuclear decoupling framework, and belongs to the field of geophysical detection and acoustic detection. The method comprises the following steps: (1) inputting observation data and initializing seabed elastic parameters; (2) determining an integral interval and decomposing the integral interval into a plurality of sub-intervals; (3) calculating an oscillation nuclear local integral matrix corresponding to the incident angle of the observation data; (4) calculating a slowly-varying kernel local mean vector; (5) calculating a spherical wave reflection coefficient of oscillation-gradual change kernel decoupling; and (6) constructing a target function by using the decoupled spherical wave reflection coefficient, and solving the target function. In the objective function solving process, only the steps (4) and (5) need to be repeatedly executed after the seabed elastic parameters are updated, the oscillation nuclear local integral matrix in the step (3) does not need to be repeatedly calculated, redundant calculation about oscillation nuclear integration is avoided, and the calculation efficiency is improved.

The invention discloses a magnetic tuning F-type voltage-controlled oscillator based on multi-coil coupling, and the oscillator comprises an F-type oscillation loop which is used for generating an oscillation signal with a required frequency, and carrying out the harmonic adjustment of a frequency spectrum of the oscillation signal; the magnetic tuning transformer is used for adjusting the voltage-current relationship of the oscillation signal in the F-type oscillation loop, changing the equivalent inductance value in the F-type oscillation loop and further adjusting the oscillation frequency; the common-mode resonant capacitor is used for determining common-mode capacitance in the F-type oscillation loop and further reducing the phase noise at the second harmonic through common-mode resonance; the F-class voltage-controlled oscillator is adopted to enhance harmonic waves to achieve frequency tripling to generate millimeter wave oscillation signals, a magnetic tuning mode is adopted to replace a varactor with a low quality factor to control and change resonant frequency, and compared with a traditional LC voltage-controlled oscillator, the voltage-controlled oscillator can obtain lower phase noise and a higher quality factor, and the performance of the voltage-controlled oscillator is improved. And an additional frequency multiplier is omitted for the generation of the millimeter wave oscillation signal.

The invention relates to a light wave double-drive spherical floating type multi-energy complementary power generation device which comprises a spherical shell, a light energy power generation module, a wave energy power generation module and a central module set. The spherical shell is formed by fixedly connecting an upper semispherical shell and a lower semispherical shell; the upper semispherical shell is a semispherical light condensing and lighting cover; the light energy power generation module is arranged at the upper part in the spherical shell and comprises a photovoltaic panel, a circuit board, a photoresistor, an optical tracking module and a panel inclination angle fine adjustment mechanism; the wave energy power generation module is arranged at the lower position in the spherical shell and comprises an x-direction wave oscillation frame, a y-direction wave oscillation arm and four columnar generators. The central module group comprises a box body, and a counterweight module, a central line collection module and an energy storage module which are mounted in the box body; the upper end of an upper cover of the box body is connected with the lower end of an inclination angle fine adjustment mechanism through a stable bracket; the central line collection module is connected with the output ends of the four columnar generators and the photovoltaic electric energy output end on the circuit board through lines, and integration of electric energy generated by a photovoltaic panel and electric energy generated by wave energy is achieved. And the energy storage module realizes storage of the integrated electric energy. The power generation stability is guaranteed, and the energy utilization rate is increased.

The invention discloses a high-speed maglev train suspension constraint control method for coping with long-wave oscillation of a track beam, and belongs to the field of maglev track traffic. The method comprises the following steps: dynamically expanding high-speed maglev train model prediction suspension control under asymmetric preset performance constraints, and coping with safety constraint control of accurate suspension of the high-speed maglev train with long-wave oscillation of a track beam: establishing a track model of the long-wave oscillation of the track beam; designing the precise suspension dynamic expansion asymmetric preset performance constraint of the high-speed maglev train according to the long-wave oscillation information of the track beam; designing a high-speed maglev train suspension air gap mathematical model containing track beam long-wave oscillation information; obtaining a state space expression based on a reconstruction error according to the dynamic expansion asymmetric preset performance constraint and the conversion error; a prediction model is obtained through the expression, an optimal control problem is designed, and an optimal solution is solved; on the premise that the track beam oscillation reference air gap tracking precision is improved, suspension deadlock of the high-speed maglev train under long-wave oscillation of the track beam is avoided, and it is ensured that the high-speed maglev train runs safely in a small suspension gap with low power consumption under long-wave oscillation of the track beam.

A slow-wave structure, a traveling wave tube, an electronic device, and a communication system are provided. The slow-wave structure includes a folded waveguide structure, where the waveguide structure has a cycle in a longitudinal direction and an amplitude in a transverse direction perpendicular to the longitudinal direction, and at least one of an amplitude of a first part of the waveguide structure and a cycle of the first part gradually changes in the longitudinal direction. Therefore, reflection of the slow-wave structure can be reduced, backward wave oscillation can be effectively suppressed, and a wider operating bandwidth can be obtained.

A method for improving cerebrospinal fluid clearance through a glymphatic system, while a patient is sleeping, resting, or a combination thereof, the method comprising measuring ultrasound data with one or more ultrasound emitters and extracting B-wave oscillations from the ultrasound data.

The invention relates to a W-band low-noise voltage-controlled oscillator based on a transformer resonant cavity and harmonic extraction. The W-band low-noise voltage-controlled oscillator comprises a dual-core in-phase coupled oscillator core, a two-bit switched capacitor bank, a linear variable capacitor bank and an output buffer, the dual-core in-phase coupled oscillator core comprises a transformer resonant cavity and a harmonic extraction network, a fundamental wave oscillation signal is generated in the transformer resonant cavity and is coupled and output to the output buffer, and a high-power second harmonic oscillation signal is generated in the harmonic extraction network and is output as a target oscillation signal; the two-bit switched capacitor bank adopts an HBT switch with excellent high-frequency performance, the tuning range of the oscillator is divided into four sub-bands, and the tuning gain is reduced; the capacitance value of the linearized variable capacitor bank is linearly changed along with the tuning voltage height, and a conversion mechanism of flicker noise is inhibited; and the output buffer realizes load isolation and buffering of the fundamental wave oscillation signal. The voltage-controlled oscillator has low tuning gain and high output power in the W wave band, and excellent phase noise is achieved.

This invention discloses a slow-wave structure and circuit suitable for high-order modes, including a housing, an upper gate extending from the top wall to the bottom wall of the housing, and a lower gate extending from the bottom wall to the top wall of the housing. Multiple upper and lower gates are staggered, defining multiple periodic vacuum cavities. The upper and lower gates have different heights along the height direction of the slow-wave structure. An electron beam channel is formed between the upper and lower gates. This invention can suppress low-order mode competition and back-wave oscillations at low operating voltages, achieving stable operation in high-order modes and achieving high output power of 100W or more with low voltage.

To provide a waveform measuring device or the like capable of reducing measurement time of the waveform of an electromagnetic wave pulse, such as a terahertz wave pulse.SOLUTION: A waveform measuring device 1 comprises: an electromagnetic wave oscillation section 23 for oscillating an electromagnetic wave pulse EMP with essentially the same frequency on the basis of an oscillation pulse OP; an electromagnetic wave detection section 24 for detecting the electromagnetic wave pulse EMP on the basis of a detection pulse DP having essentially the same frequency as that of the oscillation pulse OP; a route length changing section 25 for changing route length of the detection pulse DP; a waveform measurement section 3 for measuring a sample waveform of an electromagnetic wave pulse EMP' by allowing the electromagnetic wave detection section 24 to detect the electromagnetic wave pulse EMP' after being applied to a sample S while changing the route length by the route length changing section 25; and an initial route length setting section 42 for adjusting the route length in a direction for reducing time delay of the sample waveform relative to a reference waveform of the electromagnetic wave pulse EMP in a state without any samples S and setting initial route length when starting to measure the sample waveform.SELECTED DRAWING: Figure 1

Disclosed are a full-wave drive circuit for an ultrasonic atomizing sheet and an ultrasonic electronic cigarette. In an embodiment, the ultrasonic atomizing sheet full-wave drive circuit comprises a power supply module, a microprocessor, a high-frequency square wave generation circuit, an NMOS transistor and a resonance circuit configured to convert, on the basis of the NMOS transistor, a voltage signal outputted by the high-frequency square wave generation circuit into a full-wave oscillation signal, so as to drive the ultrasonic atomizing sheet to perform full-wave oscillation. A disclosed embodiment has low requirements for a boost module, low loss of the boost module, high power conversion efficiency, small volume, low loss of NMOS transistor and low cost, is easy for debugging, and has high reliability and good atomization effect.

The present application relates to a kind of seabed elastic parameter inversion method, system and device under the oscillation-slowly varying nuclear decoupling framework of seismic spherical reflection wave, belong to geophysical prospecting, acoustic detection field.The method includes the following steps: (1) input observation data and initialize seabed elastic parameter;(2) determine integration interval and decompose integration interval into several sub-intervals;(3) calculate the local integral matrix of oscillation kernel corresponding to the incidence angle of observation data;(4) calculate the local mean vector of slowly varying kernel;(5) calculate the spherical wave reflection coefficient of oscillation-slowly varying nuclear decoupling;(6) decoupled spherical wave reflection coefficient is used to construct objective function and solve.In the process of solving objective function, only need to repeat "step (4) (5)" after updating seabed elastic parameter, without repeating the calculation of oscillation kernel local integral matrix in step (3), avoid the redundant calculation about oscillation kernel integration, improve the calculation efficiency.

The invention belongs to the technical field of sleep regulation and control, and aims to provide a sleep regulation and control method and system based on closed-loop sound stimulation. Through phase tracking and phase compensation, the slow wave rising state can be accurately locked, millisecond-level synchronization of sound stimulation and brain slow wave oscillation can be achieved, compared with a traditional scheme only based on amplitude triggering, the physiological matching performance of sound stimulation can be remarkably improved, and the problem that stimulation and endogenous rhythm are not synchronous is fundamentally solved. According to the invention, slow wave phase locking can be realized, sound stimulation can be applied to a user at an optimal phase point, delay compensation capability is provided, and accurate control of sleep regulation can be realized.

The present invention discloses a magnetically tuned class-F voltage-controlled oscillator based on multi-coil coupling, comprising: a class-F oscillation loop, for generating an oscillation signal of a desired frequency and performing harmonic adjustment on the spectrum of the oscillation signal; a magnetically tuned transformer, for adjusting the voltage-current relationship of the oscillation signal in the class-F oscillation loop, changing the equivalent inductance value in the class-F oscillation loop, and thereby adjusting the oscillation frequency; and a common-mode resonant capacitor, for determining the common-mode capacitance in the class-F oscillation loop, and further reducing phase noise at the second harmonic through common-mode resonance. The present invention uses a class-F voltage-controlled oscillator to enhance harmonics to achieve frequency tripling to generate a millimeter-wave oscillation signal, and uses magnetic tuning to replace a low-quality-factor varactor to control and change the resonant frequency. Compared with a traditional LC voltage-controlled oscillator, the voltage-controlled oscillator of the present invention can obtain lower phase noise and higher quality factor, and eliminates the need for an additional frequency multiplier for generating millimeter-wave oscillation signals.

In the turbine rotor assembly of the first aspect of the present application, the truncated cone or conical shape of the hub can reduce fluid resistance; the hinged movable blades can automatically unfold under the action of the forward fluid and form a one-way turbine blade with the fixed blades, and when the fluid flows in the reverse direction, the movable blades can automatically close and overlap each other to shield the water outlet; thus, the turbine rotor assembly can efficiently obtain fluid energy and will not reverse. The float of the second aspect is drop-shaped, including a spherical head and a conical tail, with small oscillation resistance on the water surface, stable posture, and high efficiency in obtaining wave oscillation energy. The oscillating float wave power generation unit of the third aspect adopts the above-mentioned float and turbine rotor assembly.

A slow wave structure, a high frequency system, a traveling wave tube and a communication device, the slow wave structure comprises a waveguide, a medium support assembly, and N slow wave bands arranged in sequence along a signal transmission direction, N being a positive integer greater than or equal to 2; every two adjacent slow wave bands are arranged at intervals through a cut-off gap, and the waveguide serves as the ground to surround the N slow wave bands; along the signal transmission direction, one end, far away from the Nth slow wave band, of the first slow wave band is provided with an input port, and one end, far away from the first slow wave band, of the Nth slow wave band is provided with an output port; one end, close to the corresponding cut-off gap, of each slow wave band is connected with a concentrated attenuator, and the concentrated attenuators can reduce signal reflection of the slow wave bands at the corresponding cut-off gaps, absorb reflected signals and suppress backward wave oscillation and reflected oscillation of the traveling wave tube; and each centralized attenuator is located outside the cut-off gap and does not occupy the space in the cut-off gap, so that miniaturization is realized while high gain and high electronic efficiency are ensured.

The invention discloses a mixed slow wave structure for regulating and suppressing backward wave oscillation based on a transmission forbidden band, which comprises two unit structures: a working unit and a regulating unit, each of the two unit structures is composed of a rectangular coupling cavity, a circular electron beam channel and a grating gap, the y-direction length of the grating gap of the regulating unit is greater than that of the working unit, and the y-direction length of the circular electron beam channel is greater than that of the working unit. Therefore, compared with the working unit, the forbidden band between the mode 1 and the mode 2 of the regulation and control unit moves downwards, so that the backward wave competition frequency point of the working unit is regulated and controlled to the position close to the forbidden band in the regulation and control unit, and even if the backward wave competition frequency point of the working unit is located in the forbidden band of the regulation and control unit in the mixed slow wave structure, the backward wave competition frequency point is not limited. And the working frequency point of the working unit is located outside the forbidden band of the regulation and control unit and still has good transmission characteristics in the regulation and control unit, so that backward wave competition oscillation is suppressed, and signal transmission of the working frequency point is not influenced. The mixed slow wave structure has the characteristic of regulating and controlling a transmission forbidden band, and has important application value in the field of terahertz electric vacuum devices.

The utility model relates to an automatic adjustment power ultrasonic system, including power supply module, co-frequency drive circuit, ultrasonic oscillation circuit and sampling circuit, power supply module includes chip U8, chip U24, diode D6, diode D25 and inductor L8, co-frequency drive circuit includes chip U19, MOS transistor VT37, resistor R106, resistor R110 and resistor R119. The ultrasonic oscillation circuit comprises a triode VT32, a diode D36, a capacitor C125 and a capacitor C133. According to the utility model, the power can be automatically adjusted to a set value range, no special requirement on the transducer exists, the loss of a finished product can be greatly reduced, and meanwhile, the corresponding power adjustment is carried out along with the environment and the heating temperature of the transducer, so that the safety problem caused by overheating is prevented. And the abnormal power of the transducer can be automatically detected, so that the MCU can respond in time. The power output precision can be improved, the loss of finished products is reduced, the quality is improved, and the product safety is improved.

The invention discloses a wave impact intelligent locking protection method and system based on artificial intelligence, and belongs to the technical field of wave energy. Collecting wave oscillation waveform data, identifying wave crest time nodes, dividing time periods, monitoring a reciprocating vibration state of a vibration body and fitting a waveform; extracting a negative vibration characteristic waveform, and quantifying the observation sampling frequency of the pressure monitoring sensor; capturing a load pressure value and a time node at a negative half waveform trough, and constructing a dual-scale wavelet window model to quantify a high-frequency energy degree; load sampling frequency is calculated based on the high-frequency energy degree, and the sampling frequency is calibrated through the intelligent locking protection model and fed back to the sensor. According to the method, the time domain and energy domain characteristics of the vibration frequency are combined, the problems that in the prior art, a sampling strategy is rigid, characteristic analysis is one-sided, and a calibration mechanism is lacked are effectively solved, and the adaptability and efficiency of intelligent locking protection in the wave impact environment are improved.

To down-size a device itself and make only a part of an operator an emission source of an electromagnetic field with no need of preparing a function as a GND part in the device.SOLUTION: Since a body surface and / or the interior of a body of an operator 12 is set as a GND line side in a wrist band 16, a length of an electrode corresponding to an oscillation frequency (wavelength) can be secured, so that wiring of a length necessary as a GND line is not needed. An electromagnetic signal generating part 18 is mounted on the wrist band 16 worn by the operator 12. Since an electromagnetic wave oscillation source is restricted to a wrist part 12A (a second electrode 32 provided on an outer periphery of a band part 16A) of the operator 12, distance recognition control is executed with respect to a portion having a degree of risk higher than other portions, or a portion having a higher possibility of approaching the robot arm 14 at an earliest stage, when approaching a robot arm 14.SELECTED DRAWING: Figure 2

The utility model discloses a slurry ultrasonic dispersion device which comprises a base and a bearing cylinder installed on the base, a dispersion mechanism is arranged on the base, an oscillation mechanism is arranged at the bottom of the bearing cylinder, and the dispersion mechanism comprises a servo air cylinder, a pushing plate, a first rotating motor, a rotating shaft, a U-shaped stirring paddle, an ultrasonic generator, a connecting line and an ultrasonic vibration rod. And the oscillating mechanism comprises a rotating motor II, an oscillating shaft, an eccentric wheel, two groups of guide rods, an oscillating seat and a guide wheel. The device has the beneficial effects that the dispersing mechanism is arranged on the base, the U-shaped stirring paddle is used for stirring the slurry in the bearing cylinder, and the reinforcing agent is completely dispersed in the slurry by virtue of the ultrasonic vibration rod by virtue of overshoot wave oscillation, so that the impact-resistant slurry is obtained, and the vibration seat of the vibration mechanism is used for driving the bearing cylinder to vibrate; therefore, the dispersion effect is improved.

The invention relates to the technical field of biomedical signal processing and intelligent wearable equipment, and discloses a real-time electroencephalogram-based closed-loop targeted memory reactivation system and method.The system comprises a wearable equipment body, an electroencephalogram sensing module, a central processing unit and an audio playing module, and the electroencephalogram sensing module collects electroencephalogram signals of a user in real time; the central processing unit is used for processing the electroencephalogram signals, including sleep staging, feature recognition and decision triggering; the audio playing module plays the memory-related audio clues under specific conditions. The system accurately locates a'golden window period 'of memory consolidation by identifying a time phase coupling relationship between slow wave oscillation and sleep spindle waves in sleep to realize targeted intervention of closed-loop control, and the system further comprises a non-stress period setting module, a self-adaptive adjusting module and a multi-mode physiological sensing module, realizes full-automatic, accurate and interference-free memory enhancement, and has a good application prospect. Compared with the prior art, the method has the remarkable advantages of accuracy, no interference and high efficiency.

The application belongs to the technical field of medical apparatus and instruments, in particular to a ring radiator and an ultrashort wave therapy machine based on the ring radiator. The ring radiator comprises a main box, a container cabinet is slidably connected to the front bottom of the main box, an open capacitor mechanism is connected to the inner bottom wall of the container cabinet, the open capacitor mechanism comprises a cover plate A attached to the bottom surface of the container cabinet, the open capacitor mechanism can still maintain the vertical relationship of the electric field and the magnetic field required by the TEM mode and their distribution characteristics in space, the resonant cavity can still maintain stable TEM mode electromagnetic wave oscillation and related electromagnetic functions, and the ultrashort wave energy can be better absorbed by the diseased tissue through the stable electromagnetic wave oscillation. The ultrashort wave energy can make the diseased part produce more intense vibration and generate more heat under the oscillation of the resonant cavity at a specific frequency, promote local blood circulation, enhance the working capacity of white blood cells, help eliminate soreness, avoid the reduction of energy reaching the lesion, and affect the treatment effect.

The application discloses a wave impact intelligent locking protection method and system based on artificial intelligence and belongs to the technical field of wave energy. Wave oscillation waveform data is collected, a wave peak time node is identified and time periods are divided, a vibration body reciprocating vibration state is monitored and a waveform is fitted; a negative vibration characteristic waveform is extracted, an observation sampling frequency of a pressure monitoring sensor is quantified; a load pressure value and a time node at a negative half-wave form trough are captured, a double-scale wave window model is constructed to quantize high-frequency energy degree; a load sampling frequency is calculated based on the high-frequency energy degree, the sampling frequency is calibrated through an intelligent locking protection model and is fed back to the sensor. The application combines time domain and energy domain characteristics of a vibration frequency, effectively solves the problems of rigid sampling strategy, one-sided feature analysis and missing calibration mechanism in the prior art, and improves the adaptability and efficiency of intelligent locking protection under a wave impact environment.

The present invention provides a structure that improves radiation efficiency of terahertz waves. The present invention comprises: an AC generation source; a first electrode and a second electrode that are stacked so as to have the AC generation source interposed therebetween to apply voltage and current to the AC generation source, the second electrode having a smaller area than the first electrode; and a constricted portion that is electrically connected to at least one of the first electrode and the second electrode, the constricted portion being more constricted than the at least one of the first electrode and the second electrode to which the constricted portion is connected.

The embodiment of the invention discloses a slow wave structure and a slow wave circuit suitable for a high-order mode, and the structure comprises a housing, upper grid bodies which extend from the top wall of the housing to the bottom wall of the housing, and lower grid bodies which extend from the bottom wall of the housing to the top wall of the housing, and the plurality of upper grid bodies and the plurality of lower grid bodies are distributed in a staggered manner. A plurality of vacuum cavities with periodic structures are defined by the upper grid bodies and the lower grid bodies; in the height direction of the slow wave structure, the upper grid body and the lower grid body have different heights; an electron beam channel is formed between the upper gate body and the lower gate body. According to the invention, low-order mode competition and backward wave oscillation can be suppressed under low working voltage, high-order mode stable working is realized, and high output power of 100W and above can be realized with low voltage.

This invention provides a method for oscillation simulation testing, implemented using a wave compensation test bench. The wave compensation test bench includes a first oscillation device, a second oscillation device, and a lifting device. The lifting device is mounted on the second oscillation device, and the second oscillation device is mounted on the first oscillation device. The first oscillation device drives the lifting device to oscillate along a first oscillation direction, and the second oscillation device drives the lifting device to oscillate along a second oscillation direction. The lifting device moves up and down along a third movement direction. The first oscillation direction, the second oscillation direction, and the third movement direction are perpendicularly arranged. The oscillation in the first oscillation direction, the second oscillation direction, and the third movement direction enable the lifting device to move in three different directions, while the first oscillation direction, the second oscillation direction, and the third movement direction are perpendicularly arranged. Therefore, the lifting device can move along the X-axis, the Y-axis, and the Z-axis, thereby simulating wave oscillation.

The present invention discloses a wave vibration algorithm for improving the image quality level of an X-ray machine. The algorithm can transform and process two-dimensional signals into simulated three-dimensional signals and colored signals, provide more comprehensive and accurate signal analysis, and by screening out high-quality signals, can help optimize the rapid allocation of resources, reduce the time and demand for storage space, and can be applicable to a variety of different types of equipment and application scenarios. The algorithm can automatically calculate in real time to obtain the best feedback radiation signal for processing, can more accurately capture the quality characteristics of the identification and differentiation analysis signals, can dynamically adjust its processing parameters according to the signal characteristics to optimize the signal screening process, can quickly identify high-quality signals in the feedback signals, can effectively resist noise interference, improve the signal-to-noise ratio of the signal, and can still maintain a high performance under various adverse conditions such as signal distortion and noise interference, showing good robustness.

The invention provides a slow wave regulation and control method based on forehead electroencephalogram. The slow wave regulation and control method comprises the following steps that S1, real-time signal processing is carried out; and S2, feature extraction. According to the method, the time-frequency characteristics of different wave bands are extracted from the electroencephalogram signals, the current sleep staging state is judged by utilizing rules according to the extracted characteristics, then whether slow wave oscillation exists or not is judged by analyzing the energy proportion and the peak-to-peak value of delta R waves in the electroencephalogram signals, and the threshold value is adjusted based on the dynamic change of the current electroencephalogram signals. Therefore, the influence of individual difference on the recognition result is eliminated, and the accuracy and stability of slow wave recognition are improved. In addition, the rising edge of the signal can be quickly and accurately identified, so that the method is suitable for scenes needing quick feedback and real-time application.

The invention relates to a composite rectangular wave signal generation circuit which is composed of two forward feedback self-oscillation unit circuits, the first unit circuit comprises two triodes Q1 and Q3, a resistor R2, a resistor R3, a resistor R7, a resistor R9, a resistor R10, a capacitor C2 and a diode D2, and the second unit circuit comprises two triodes Q2 and Q4, a resistor R1, a resistor R5, a resistor R6, a resistor R11, a resistor R12, a capacitor C1, a diode D1 and a coupling resistor R4. According to the invention, based on a forward feedback mechanism of a crystal triode system, the system enters a self-oscillation state, rectangular wave oscillation signals with different frequencies are generated, and a composite rectangular wave signal can be generated through adjustment of static parameters and coupling. The device is simple in structure, convenient to design, easy to maintain and lower in production and manufacturing cost.

According to the airfoil structure for improving the performance of the large-attack-angle NACA0012 airfoil through suction surface traveling wave type oscillation, when the included angle between the airfoil and incoming flow is larger than or equal to 15 degrees, the suction surface of the airfoil is a traveling wave type suction surface, and by arranging alternate wave crests and wave troughs on the suction surface, an air boundary layer is changed into turbulent flow from laminar flow in advance, so that the performance of the large-attack-angle NACA0012 airfoil is improved, and the performance of the large-attack-angle NACA0012 airfoil is improved. Therefore, separation of a fluid boundary layer is delayed, and the aerodynamic performance of the airfoil is improved. And the amplitude of the traveling wave type suction surface is firstly increased and then decreased in the direction from the front edge of the airfoil profile to the tail edge of the airfoil profile. Continuous energy is provided for the boundary layer through traveling wave type oscillation, and separation of the boundary layer at the large attack angle is effectively restrained.