Broadband high-frequency flutter differential pressure wave excitation device

Abstract

The invention provides a broadband high-frequency flutter differential pressure wave excitation device, belongs to the technical field of hydraulic control, and realizes multi-frequency low-distortion periodic flutter excitation pressure waves in a broadband range (1-2000 / 10000 Hz) in a hydraulic system. The device comprises two pressure excitation chambers and an electromagnetic excitation actuator, so that hydraulic excitation waves in a differential form are provided for the two chambers of a hydraulic cylinder respectively. Wherein the pressure excitation chamber is of a piston structure, can realize relative amplification of high-frequency micro-displacement, and is driven by an electric excitation actuator. The electric excitation actuator selects a Terfenol-D magnetostrictive material as a driving source. The device is simple in overall structure and convenient to use, has the capacity of linearly adjusting the output hydraulic flow and has the overall high anti-pollution capacity, most of designed key performance parts are standard parts, and the manufacturing difficulty is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the field of hydraulic control technology and relates to a wide-band high-frequency flutter differential pressure wave excitation device, and in particular to a high-frequency flutter exciter for generating the excitation of high-frequency pressure waves inside a hydraulic cylinder and realizing the differential output of periodic superimposed waves of different waveforms, amplitudes and frequencies. Background Art

[0002] The friction nonlinearity of hydraulic cylinders is the main obstacle to achieving high-precision servo control. Nonlinear friction seriously affects the running stability and tracking accuracy of the system, causing problems such as "creeping" phenomenon, increased control error and significant dead zone characteristics in the system, which limits the performance of the system under complex operating conditions. As far as the current research results are concerned, flutter wave friction reduction technology is an efficient and easy-to-implement friction reduction method that can effectively suppress the influence of nonlinear coupling friction. By eliminating the directionality of friction, flutter waves ensure that the hydraulic cylinder piston maintains continuous motion, avoiding the influence of static friction, thereby improving system performance.

[0003] However, conventional flutter methods are currently limited to the performance of control valves. For non-sinusoidal signals such as triangular waves, square waves, sawtooth waves, etc., which are composed of a series of discrete frequency components, the frequency distribution ranges from low frequency to high frequency. In the actual control process, due to the narrow bandwidth of the control valve, when the excitation signal is input, the signal amplitude will gradually decay to zero as the flutter frequency increases. Frequency attenuation and loss often bring side effects such as noise and jitter. Among the currently available results, the research range of flutter frequency is limited to within 150Hz, and there is a lack of more systematic research content on the waveform and amplitude of high-frequency flutter excitation. For example, China's invention patent CN103174702A has developed a targeted ultrasonic flutter method for piston flutter, and installed a piezoelectric ceramic device on the piston surface as a flutter excitation source, but its application limitations are also relatively obvious, and it is difficult to fully exert the expected effect in high-pressure hydraulic equipment, especially in service equipment.

[0004] Therefore, developing a high-frequency flutter actuator suitable for high-pressure hydraulic systems is of great application and research significance. Since traditional mechanical and motor drive methods can no longer provide power drive for high-frequency flutter actuators, considering the characteristics of high frequency and small amplitude of flutter signals, it is necessary to adopt a new drive method and control strategy with better performance. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a wide-band high-frequency vibration differential pressure wave excitation device suitable for hydraulic systems, which realizes the differential drive control means of the vibration friction reduction pressure wave of the hydraulic system in the high-frequency band (0-2000 / 10000Hz), so as to fill the gap in the current high-frequency hydraulic excitation equipment. The new device has a simple structure, strong anti-fouling ability, and is stable and reliable.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A wide-band high-frequency flutter differential pressure wave excitation device, the main feature of which is to realize multi-frequency low-distortion periodic flutter excitation pressure waves within a wide-band range (1-2000 / 10000Hz) in a hydraulic system. The overall design of the wide-band high-frequency flutter differential pressure wave excitation device is a bilaterally symmetrical structure, including an upper oil pressure housing 1, a lower actuating housing 2, a support end cover 23 at the bottom of the actuating housing 2, and two pressure chambers and two electromagnetic excitation actuators located inside the oil pressure housing 1, the actuating housing 2, and the support end cover 23, so as to provide differential hydraulic excitation waves for the two chambers of the hydraulic cylinder respectively. Among them, the two pressure chambers include a left pressure chamber and a right pressure chamber, the left pressure chamber is equipped with a left electromagnetic excitation actuator, and the right pressure chamber is equipped with a right electromagnetic excitation actuator.

[0008] The oil pressure housing 1 is sealed to the top of the actuating housing 2, and the bottom of the actuating housing 2 is sealed to the support end cover 23. The two pressure chambers are respectively composed of the left and right cavities inside the oil pressure housing 1 and the actuating housing 2. The pressure chamber inside the oil pressure housing 1 includes two symmetrically arranged left and right pressure excitation chambers, and the pressure chamber inside the actuating housing 2 includes two symmetrically arranged left and right motion chambers. The left pressure chamber is composed of a left pressure excitation chamber and a left motion chamber, and the right pressure chamber is composed of a right pressure excitation chamber and a right motion chamber.

[0009] Furthermore, the oil pressure housing 1 is a symmetrical double-cavity structure, and the left pressure excitation chamber inside is used as an example for description. The left pressure excitation chamber is a trapezoidal cylindrical through hole that penetrates the oil pressure housing 1, and can be divided into two cylindrical cavities with different diameters in the longitudinal direction. Among them, the diameter of the cylindrical cavity of the upper part is relatively small, which is used to connect with the output interface end of the oil, and a protruding integrated annular interface is designed at the top part of the cylindrical cavity. The outside of the annular interface is a standard thread, which is convenient for the sealing installation of the external oil pipeline. The diameter of the cylindrical cavity of the lower part is relatively large, and an exhaust hole is reserved in the convex shoulder part connected to the small-diameter cylindrical cavity of the upper part. The specific location is the top of the left convex shoulder of the left pressure excitation chamber. The exhaust hole is fixedly connected to the left cone valve exhaust valve 3 by threads to realize the exhaust function of the left pressure excitation chamber. The actuating piston structure of the left electromagnetic excitation actuator is installed inside the cylindrical cavity of the lower part. The actuating piston structure includes a left vibration excitation head 4, a left output rod 5, a left pre-compression spring 6 and a left vibration sealing ring group 11.

[0010] The top of the actuating piston structure is a cylindrical left flutter excitation head 4 with a circumferential groove, and the left flutter excitation head 4 is connected to the inner wall of the left cavity of the oil pressure housing 1 through a left flutter sealing ring group 11 for multi-stage sealing. The bottom center position of the left flutter excitation head 4 is connected to the left output rod 5, and the left output rod 5 is a trapezoidal metal connecting rod with an inverted T-shaped structure as a whole, the upper part is a small-diameter metal round rod, the round rod is a screw rod with a thread on the top, and is fixed to the bottom center threaded hole of the left flutter excitation head 4 by thread; the bottom is a large-diameter rod cap extending to the left cavity inside the actuating housing 2; the middle rod body part of the left output rod 5 is covered with a left pre-stressed spring 6, and the bottom of the left pre-stressed spring 6 is pressed and fixedly connected with the convex shoulder on the upper surface of the bottom rod cap of the left output rod 5. The top of the left pre-stressed spring 6 is fixed to the convex shoulder in the left movement cavity inside the actuating housing 2, and the specific fixing position is described in detail below.

[0011] The two independent motion chambers inside the actuating housing 2 are designed as a left-right symmetrical structure. Taking the left motion chamber as an example, the left motion chamber is a through hole that runs through the actuating housing 2, and can be divided into three cylindrical cavities of different diameters in the longitudinal direction. After installation, the overall position is coaxially arranged longitudinally with the left pressure excitation chamber in the oil pressure housing 1. Among them, the diameter of the cylindrical cavity in the upper part of the left motion chamber is smaller than the minimum diameter of the cavity in the oil pressure housing 1, the diameter of the cylindrical cavity in the middle part is slightly larger than the maximum diameter of the cavity in the oil pressure housing 1, and the diameter of the cylindrical cavity in the lower part is the largest. The interior of the upper part of the cavity of the left motion chamber is the middle part of the left output rod 5, which is used to realize the rigid motion connection between the bottom rod cap of the left output rod 5 and the top left vibration excitation head 4; the interior of the middle part of the cavity of the left motion chamber is the bottom rod cap part of the left output rod 5, which is used to realize the motion guide space of the left output rod 5. The shoulder transition surface between the upper part and the middle part of the left motion chamber is the compression and fixing position of the top of the left preload spring 6, which realizes the downward movement rebound preload of the left output rod 5. The electromagnetic excitation structure of the left electromagnetic excitation actuator is installed inside the cavity of the lower part of the left motion chamber, and the electromagnetic excitation structure includes a left permanent magnet group 7, a left excitation coil 8, a left Terfenol-D rod (magnetostrictive material) 9 and a left strain gauge group 10.

[0012] The electromagnetic excitation structure is an annular multi-layer cylindrical structure, which includes the innermost left Terfenol-D rod (magnetostrictive material) 9, the left strain gauge group 10, the left excitation coil 8 and the left permanent magnet group 7 from the inside to the outside. The left strain gauge group 10 is glued on the outer surface of the left Terfenol-D rod 9, and the left excitation coil 8 and the left permanent magnet group 7 are fixed on the inner wall of the lower part of the left motion chamber. Furthermore, the excitation external circuit wire of the left excitation coil 8 is led out from an external through hole on the left side of the inner wall of the lower part of the left motion chamber, and the external through hole is glued and sealed after installation.

[0013] The right electromagnetic excitation actuator is realized with the same structure, including a right cone valve exhaust valve 12, a right flutter excitation head 13, a right output rod 14, a right preload spring 15, a right permanent magnet group 16, a right excitation coil 17, a right Terfenol-D rod 18, a right strain gauge group 19 and a right flutter seal ring group 20. The connection and installation method of each part is symmetrical with that of the left electromagnetic excitation actuator, forming a controllable telescopic hydraulic piston with upper and lower seals, which will not be described in detail here.

[0014] Furthermore, the lower end surface of the oil pressure housing 1 is sealed and fixedly connected to the upper end surface of the actuating housing 2 through the housing sealing gasket 22 under the pressure of the housing fixing screw group 21; the lower end surface of the actuating housing 2 is sealed and fixedly connected to the upper end surface of the supporting end cover 23 through the end cover sealing gasket 25 under the pressure of the end cover fixing screw group 24.

[0015] A method for using a wide-band high-frequency vibration differential pressure wave excitation device includes the following steps: inputting different externally controlled (differential) current signals to the left excitation coil 8 and the right excitation coil 17, respectively generating different magnetic field change responses at the positions of the left Terfenol-D rod 9 and the right Terfenol-D rod 18, and under the action of the magnetic field change, the left Terfenol-D rod 9 and the right Terfenol-D rod 18 perform high-frequency expansion and contraction with the external control signal. The left Terfenol-D rod 9 drives the left output rod 5 to drive the left vibration excitation head 4 to move up and down, and the right Terfenol-D rod 18 drives the right output rod 14 to drive the right vibration excitation head 13 to move up and down, that is, high-frequency piston movement is performed in the left and right chambers of the oil pressure housing 1 to generate a corresponding waveform (differential) pressure wave output. The left and right pressure chambers are connected to the chambers on both sides of the hydraulic cylinder through oil pipelines, respectively, so that the hydraulic cylinder piston can be driven and controlled by high-frequency vibration. The motion state of the Terfenol-D rod is monitored and fed back in real time through the left strain gauge group 10 and the right strain gauge group 19 to achieve higher precision flutter motion control.

[0016] The effects and benefits of the present invention are:

[0017] (1) The present invention designs a symmetrical bidirectional synchronous drive structure, which can provide high-frequency differential flutter pressure waves for hydraulic cylinder equipment, thereby satisfying the high-frequency flutter friction reduction conditions that are difficult to achieve with existing hydraulic equipment in a simpler way, while obtaining higher output power.

[0018] (2) The driving source of the vibrator selected in the present invention is Terfenol-D magnetostrictive material, which has the advantages of high compressive strength, high power, and large expansion coefficient. Combined with the designed symmetrical bidirectional piston motion form pressure excitation chamber, it can cleverly achieve relative amplification of micro-displacement.

[0019] (3) The overall structure of the device of the present invention is simple and clear, the design is detailed, and it has the ability to linearly adjust the output hydraulic flow. It has strong overall anti-pollution ability, and most of the key performance components designed are selected from standard parts, which greatly reduces the manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the overall structure of a new broadband high-frequency flutter differential pressure wave excitation device.

[0021] Figure 2 This is an installation example diagram of a new broadband high-frequency flutter differential pressure wave excitation device.

[0022] In the figure: 1 hydraulic housing, 2 actuator housing, 3 left cone valve type exhaust valve, 4 left vibration excitation head, 5 left output rod, 6 left preload spring, 7 left permanent magnet group, 8 left excitation coil, 9 left Terfenol-D rod, 10 left strain gauge group, 11 left vibration sealing ring group, 12 right cone valve type exhaust valve, 13 right vibration excitation head, 14 right output rod, 15 right preload spring, 16 right permanent magnet group, 17 right excitation coil, 18 right Terfenol-D rod, 19 right strain gauge group, 20 right vibration sealing ring group, 21 housing fixing screw group, 22 housing sealing gasket, 23 support end cover, 24 end cover fixing screw group, 25 end cover sealing gasket, 26 hydraulic cylinder, 27 left oil inlet, 28 right oil inlet, 29 left vibration oil circuit, 30 right vibration oil circuit. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is described in detail below in conjunction with the technical scheme and the accompanying drawings.

[0024] A broadband high-frequency flutter differential pressure wave excitation device, the overall design of the broadband high-frequency flutter differential pressure wave excitation device is a bilaterally symmetrical structure, including an upper oil pressure housing 1, a lower actuating housing 2, a support end cover 23 at the bottom of the actuating housing 2, and two pressure chambers and two electromagnetic excitation actuators located inside the oil pressure housing 1, the actuating housing 2, and the support end cover 23, so as to provide differential hydraulic excitation waves for the two chambers of the hydraulic cylinder respectively. Among them, the two pressure chambers include a left pressure chamber and a right pressure chamber, the left electromagnetic excitation actuator is installed in the left pressure chamber, and the right electromagnetic excitation actuator is installed in the right pressure chamber.

[0025] The oil pressure housing 1 is sealed and connected to the top of the actuating housing 2, and the bottom of the actuating housing 2 is sealed and connected to the supporting end cover 23. Specifically, the lower end face of the oil pressure housing 1 is sealed and fixed to the upper end face of the actuating housing 2 through the housing sealing gasket 22 under the pressure of the housing fixing screw group 21; the lower end face of the actuating housing 2 is sealed and fixed to the upper end face of the supporting end cover 23 through the end cover sealing gasket 25 under the pressure of the end cover fixing screw group 24. The two pressure chamber parts are respectively composed of the left and right cavities inside the oil pressure housing 1 and the actuating housing 2. The pressure chamber inside the oil pressure housing 1 includes two symmetrically arranged left and right pressure excitation chambers, and the pressure chamber part inside the actuating housing 2 includes two symmetrically arranged left and right motion chambers. The left pressure chamber is composed of a left pressure excitation chamber and a left motion chamber, and the right pressure chamber is composed of a right pressure excitation chamber and a right motion chamber.

[0026] The oil pressure housing 1 is a symmetrical double-cavity structure. The left pressure excitation chamber inside is used as an example for description. The left pressure excitation chamber is a trapezoidal cylindrical through hole that penetrates the oil pressure housing 1, and can be divided into two cylindrical cavities with different diameters in the longitudinal direction. Among them, the diameter of the cylindrical cavity of the upper part is relatively small, which is used to connect with the output interface end of the oil, and a protruding integrated annular interface is designed at the top part of the cylindrical cavity. The outside of the annular interface is a standard thread, which is convenient for the sealing installation of the external oil pipeline. The diameter of the cylindrical cavity of the lower part is relatively large, and an exhaust hole is reserved in the convex shoulder part connected to the small-diameter cylindrical cavity of the upper part. The specific location is the top of the left convex shoulder of the left pressure excitation chamber. The exhaust hole is fixedly connected to the left cone valve exhaust valve 3 through threads to realize the exhaust function of the left pressure excitation chamber. The actuating piston structure of the left electromagnetic excitation actuator is installed inside the cylindrical cavity of the lower part. The actuating piston structure includes a left vibration excitation head 4, a left output rod 5, a left pre-compression spring 6 and a left vibration sealing ring group 11.

[0027] In this embodiment, the top of the actuating piston structure is a cylindrical left flutter excitation head 4 with a circumferential groove, and the left flutter excitation head 4 is connected to the inner wall of the left cavity of the oil pressure housing 1 through a left flutter sealing ring group 11 for multi-stage sealing. The bottom center position of the left flutter excitation head 4 is connected to the left output rod 5, and the left output rod 5 is a trapezoidal metal connecting rod with an inverted T-shaped structure as a whole, the upper part is a small-diameter metal round rod, the round rod is a screw rod with a thread on the top, and is fixed to the bottom center threaded hole of the left flutter excitation head 4 by thread; the bottom is a large-diameter rod cap extending to the left cavity inside the actuating housing 2; the middle rod body part of the left output rod 5 is covered with a left pre-stressed spring 6, and the bottom of the left pre-stressed spring 6 is pressed and fixedly connected with the convex shoulder on the upper surface of the bottom rod cap of the left output rod 5. The top of the left pre-stressed spring 6 is fixed to the convex shoulder in the left motion cavity inside the actuating housing 2, and the specific fixing position is described in detail below.

[0028] The two independent motion chambers inside the actuating housing 2 are designed as a left-right symmetrical structure. Taking the left motion chamber as an example, the left motion chamber is a through hole that runs through the actuating housing 2, and can be divided into three cylindrical cavities of different diameters in the longitudinal direction. After installation, the overall position is coaxially arranged longitudinally with the left pressure excitation chamber in the oil pressure housing 1. Among them, the diameter of the cylindrical cavity in the upper part of the left motion chamber is smaller than the minimum diameter of the cavity in the oil pressure housing 1, the diameter of the cylindrical cavity in the middle part is slightly larger than the maximum diameter of the cavity in the oil pressure housing 1, and the diameter of the cylindrical cavity in the lower part is the largest. The interior of the upper part of the cavity of the left motion chamber is the middle part of the left output rod 5, which is used to realize the rigid motion connection between the bottom rod cap of the left output rod 5 and the top left vibration excitation head 4; the interior of the middle part of the cavity of the left motion chamber is the bottom rod cap part of the left output rod 5, which is used to realize the motion guide space of the left output rod 5. The shoulder transition surface between the upper part and the middle part of the left motion chamber is the compression and fixing position of the top of the left preload spring 6, which realizes the downward movement rebound preload of the left output rod 5. The electromagnetic excitation structure of the left electromagnetic excitation actuator is installed inside the cavity of the lower part of the left motion chamber, and the electromagnetic excitation structure includes a left permanent magnet group 7, a left excitation coil 8, a left Terfenol-D rod 9 and a left strain gauge group 10.

[0029] In this embodiment, the electromagnetic excitation structure is an annular multi-layer cylindrical structure, which includes the innermost left Terfenol-D rod 9, the left strain gauge group 10, the left excitation coil 8 and the left permanent magnet group 7 from the inside to the outside. The left strain gauge group 10 is glued on the outer surface of the left Terfenol-D rod 9, and the left excitation coil 8 and the left permanent magnet group 7 are fixed on the inner wall surface of the lower part of the left motion chamber. The excitation external circuit wire of the left excitation coil 8 is led out from an external through hole on the left side of the inner wall surface of the lower part of the left motion chamber, and the external through hole is glued and sealed after installation.

[0030] The right electromagnetic excitation actuator is realized with the same structure, including a right cone valve exhaust valve 12, a right flutter excitation head 13, a right output rod 14, a right preload spring 15, a right permanent magnet group 16, a right excitation coil 17, a right Terfenol-D rod 18, a right strain gauge group 19 and a right flutter seal ring group 20. The connection and installation method of each part is symmetrical with that of the left electromagnetic excitation actuator, forming a controllable telescopic hydraulic piston with upper and lower seals, which will not be described in detail here.

[0031] The application of this embodiment is as follows: Figure 2As shown, the flutter excitation device is sealed and connected to the oil chambers on both sides of the hydraulic cylinder piston, and the connecting oil circuit is filled with hydraulic oil under the adjustment of the exhaust valve. On this basis, when different control waveform signals are input to the left and right parts of the flutter excitation device, the external NF power supply sends real-time signal instructions respectively, and then inputs corresponding current signals to the excitation coils 8 and 17 of the Terfenol-D rod. Under the joint action of the permanent magnet group 7 and 16 and the pre-compression spring 6 and 15, the Terfenol-D rod 9 and 18 are made to perform high-frequency telescopic movement with the expected waveform, wherein the movement state of the Terfenol-D rod is monitored and fed back in real time through the left strain gauge group 10 and the right strain gauge group 19, so as to achieve higher-precision flutter motion control. The preload springs 6, 15 and the support end caps 23 will transfer the axial deformation rigidity of the Terfenol-D rods 9, 18 to the output rods 5, 14, and further drive the flutter excitation heads 4, 13 to move precisely with the desired waveform, and finally act on the high-pressure oil, transmitting the flutter excitation pressure wave to the surface of the hydraulic cylinder piston through the oil circuit, providing a differential high-frequency flutter force.

[0032] Working principle: Terfenol-D generates high-frequency telescopic motion under the action of the excitation magnetic field. The high-frequency telescopic motion is transmitted to the flutter head through the output rod. The flutter head is directly in contact with the high-pressure oil, thereby generating two-phase flutter oil pressure. The high-pressure oil flutter head is connected to the excitation cavity through the piston, realizing the rigid transmission of the excitation load. The differential high-frequency flutter force on the two sides of the piston makes the hydraulic cylinder piston in a high-frequency vibration state, triggering the flutter friction reduction effect, so that the hydraulic cylinder has low friction characteristics.

[0033] The so-called high-frequency vibration friction reduction refers to the introduction of high-frequency excitation (0~2000 / 10000Hz) on one or more sides of the friction pair, so that the friction pairs are in a high-frequency relative motion state, and then the friction force is maintained in a dynamic friction state to reduce the dead zone effect caused by the maximum static friction.

[0034] The connection method between the excitation coils 8, 17 and the driving power supply device can be: one end of the two soft wires is welded to the excitation coil input connector, and then the other end of the soft wire passes through the supporting end cover 23 and the wire embedding groove reserved in the actuating housing 2 and is connected to the driving power supply device, and then the groove part is sealed with a rubber gasket.

[0035] Parameter design method: The vibration wave amplitude is directly related to the volume of the oil in the two chambers of the hydraulic cylinder, the elastic modulus, and the pipe deformation. For a certain system, the corresponding mathematical relationship can be easily obtained to determine the required volume change of the hydraulic oil. Therefore, in the actual implementation process, the design of the vibrator power and the vibrator head can be completed according to the vibration wave amplitude and frequency information.

[0036] The above-described embodiments merely express the implementation methods of the present invention, but they should not be understood as limiting the scope of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A broadband high-frequency flutter differential pressure wave excitation device, characterized in that: The broadband high-frequency vibration differential pressure wave excitation device is an overall bilaterally symmetrical structure, comprising an upper oil pressure housing (1), a lower actuating housing (2), a support end cover (23) at the bottom of the actuating housing (2), and two pressure chambers located inside the oil pressure housing (1), the actuating housing (2), and the support end cover (23), and an electromagnetic excitation actuator installed in the pressure chamber, which respectively provide differential hydraulic excitation waves for the two chambers of the hydraulic cylinder.

2. A broadband high-frequency flutter differential pressure wave excitation device according to claim 1, characterized in that: The oil pressure housing (1) is sealedly connected to the top of the actuating housing (2), and the bottom of the actuating housing (2) is sealedly connected to the supporting end cover (23); the two pressure chamber parts are respectively composed of left and right cavities inside the oil pressure housing (1) and the actuating housing (2), including a left pressure chamber and a right pressure chamber; a left electromagnetic excitation actuator is installed in the left pressure chamber, and a right electromagnetic excitation actuator is installed in the right pressure chamber; The oil pressure housing (1) is provided with two symmetrically arranged left and right pressure excitation chambers, and the actuating housing (2) is provided with two symmetrically arranged left and right motion chambers; the left pressure chamber is composed of a left pressure excitation chamber and a left motion chamber, and the right pressure chamber is composed of a right pressure excitation chamber and a right motion chamber.

3. A broadband high-frequency flutter differential pressure wave excitation device according to claim 2, characterized in that: The oil pressure housing (1) is a symmetrical double-cavity structure, and the left pressure excitation chamber is used for illustration: the left pressure excitation chamber is a trapezoidal cylindrical through hole that penetrates the oil pressure housing (1), and can be divided into two cylindrical cavities of different diameters in the longitudinal direction, and the diameter of the upper cylindrical cavity is smaller than the diameter of the lower cylindrical cavity; the upper cylindrical cavity is connected to the output interface end of the oil, and the lower cylindrical cavity is provided with an exhaust hole in the convex shoulder part connected to the upper small-diameter cylindrical cavity, and the exhaust hole is fixedly connected to the left cone valve type exhaust valve (3) to realize the exhaust function; the actuating piston structure of the left electromagnetic excitation actuator is installed in the lower cylindrical cavity; the actuating piston structure includes a left vibration excitation head (4), a left output rod (5), and a left pre-compression spring (6); The two independent motion chambers inside the actuating housing (2) are of a left-right symmetrical structure; the left motion chamber is used for explanation: the left motion chamber is a through hole penetrating the actuating housing (2), and is longitudinally divided into three cylindrical cavities with successively larger diameters, including an upper cylindrical cavity, a middle cylindrical cavity, and a lower cylindrical cavity, which are longitudinally arranged coaxially with the left pressure excitation chamber in the oil pressure housing (1) after installation; the interior of the upper cylindrical cavity is the middle part of the left output rod (5), and the interior of the middle cylindrical cavity is the bottom rod cap structure of the left output rod (5), which is used as a motion guide space for the left output rod (5); the convex shoulder transition surface between the upper cylindrical cavity and the middle cylindrical cavity is the compression and fixing position of the top of the left preload spring (6), which realizes the downward movement and rebound of the left output rod (5); the interior of the lower cylindrical cavity is equipped with an electromagnetic excitation structure of the left electromagnetic excitation actuator, and the electromagnetic excitation structure includes a left permanent magnet group (7), a left excitation coil (8), a left Terfenol-D rod (9), and a left strain gauge group (10).

4. A broadband high-frequency flutter differential pressure wave excitation device according to claim 3, characterized in that: The top of the actuating piston structure in the oil pressure housing (1) is a cylindrical left flutter excitation head (4) with a circumferential groove; the bottom center position of the left flutter excitation head (4) is connected to the left output rod (5), and the left output rod (5) is a trapezoidal metal connecting rod with an inverted T-shaped structure as a whole, with the upper part being a metal round rod and the bottom being a rod cap structure, and the rod cap extends to the left cavity of the actuating housing (2); the middle rod body part of the left output rod (5) is covered with a left preload spring (6), and the top of the left preload spring (6) is fixed to the boss in the left movement cavity inside the actuating housing (2); The electromagnetic excitation structure of the left electromagnetic excitation actuator in the actuation housing (2) is an annular multi-layer cylindrical structure, which comprises, from the inside to the outside, the innermost layer of the left Terfenol-D rod (9), the left strain gauge group (10), the left excitation coil (8) and the left permanent magnet group (7); the left strain gauge group (10) is adhered to the outer surface of the left Terfenol-D rod (9), and the left excitation coil (8) and the left permanent magnet group (7) are fixed to the inner wall surface of the cylindrical cavity below; the excitation external circuit wire of the left excitation coil (8) is led out from the through hole on the cylindrical cavity wall; The right electromagnetic excitation actuator and the left electromagnetic excitation actuator in the actuation housing (2) have the same structure.

5. A broadband high-frequency flutter differential pressure wave excitation device according to claim 3, characterized in that: The diameter of the upper cylindrical cavity of the left moving chamber in the actuating housing (2) is smaller than the minimum diameter of the cavity of the oil pressure housing (1), the diameter of the middle cylindrical cavity is larger than the maximum diameter of the cavity in the oil pressure housing (1), and the diameter of the lower cylindrical cavity is the largest.

6. A broadband high-frequency flutter differential pressure wave excitation device according to claim 3, characterized in that: The left flutter excitation head (4) of the actuating piston structure is connected to the inner wall of the left cavity of the oil pressure housing (1) in a multi-stage sealing manner via a left flutter sealing ring group 11.

7. A broadband high-frequency flutter differential pressure wave excitation device according to claim 3, characterized in that: The top portion of the upper cylindrical cavity of the oil pressure housing (1) is designed with a protruding integrated annular interface, the outside of which is a standard thread for sealing and mounting with an external oil pipeline.

8. A broadband high-frequency flutter differential pressure wave excitation device according to claim 1, characterized in that: The lower end surface of the oil pressure housing (1) is sealed and fixedly connected to the upper end surface of the actuating housing (2) through a housing sealing gasket (22) under the pressure of a housing fixing screw group (21).

9. A broadband high-frequency flutter differential pressure wave excitation device according to claim 1, characterized in that: The lower end surface of the actuating housing (2) is sealed and fixedly connected to the upper end surface of the supporting end cover (23) through an end cover sealing gasket (25) under the pressure of an end cover fixing screw group (24).

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