Variable-stroke vibroseis vibrator, variable-stroke vibroseis vibrator system and vibration control method

Abstract

The embodiment of the invention provides a variable-stroke vibroseis vibrator. Comprising a flat plate assembly, a reaction heavy hammer, a first variable-range piston and a second variable-range piston, the flat plate assembly comprises a piston rod and a central piston; the upper part of the cavity of the reaction heavy hammer is sealed by a first sealing component, the lower part of the cavity is sealed by a second sealing component, and the first sealing component and the second sealing component are fixedly connected with the reaction heavy hammer; the central piston divides the cavity into an upper cavity and a lower cavity; the first variable-range piston and the second variable-range piston are arranged in the upper cavity and the lower cavity respectively, are fixedly connected with the first sealing component through a first connecting rod and fixedly connected with the second sealing component through a second connecting rod respectively, and form a first piston cavity and a second piston cavity with the center piston respectively; in the vibration process, the first connecting rod and the second connecting rod stretch out and draw back according to the vibration frequency of the reaction heavy hammer, so that the total volume of the first piston cavity and the second piston cavity is changed.

Description

Technical Field

[0001] This invention relates to the field of seismic exploration, and in particular to a variable-stroke controllable source vibrator and system and a vibration control method. Background Technology

[0002] Broadband seismic exploration technology is one of the important methods for achieving high-precision seismic exploration. It can obtain high-resolution images of thin layers and small sedimentary traps, and achieve clear imaging of deep targets, providing more stratigraphic structure and detailed information, improving the interpretation level of seismic data, and providing more stable inversion results. Domestic and foreign companies have successively launched broadband seismic acquisition and processing technologies, which have been applied in many regions around the world. Extended low-frequency excitation with controlled sources is an important component of broadband excitation technology.

[0003] The total volume of the piston cavity in existing controllable source vibrators is fixed and cannot change with the vibration frequency, thus failing to meet the requirements of the piston cavity for both low-frequency and high-frequency vibrations of the controllable source. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a variable stroke controllable source vibrator and system and a vibration control method that overcome or at least partially solve the above problems.

[0005] In a first aspect, embodiments of the present invention provide a variable-stroke controllable vibration source vibrator, comprising:

[0006] The plate assembly comprises a plate, a reaction weight, a first variable-stroke piston, and a second variable-stroke piston; the plate assembly includes a top plate, a weight guide post, a plate, a piston rod, and a central piston; the central piston is fixedly disposed in the middle of the piston rod; the reaction weight passes through the weight guide post and can move up and down along the post, causing the plate assembly to vibrate up and down;

[0007] The reaction weight has a cavity at its center, through which the piston rod and the central piston pass. The upper part of the cavity is sealed by a first sealing component, which is fixedly connected to the reaction weight. The lower part of the cavity is sealed by a second sealing component, which is also fixedly connected to the reaction weight. The central piston divides the cavity into an upper chamber and a lower chamber.

[0008] The first variable-range piston is disposed in the upper cavity, fixedly connected to the first sealing component via a first connecting rod, and forms a first piston cavity with the central piston; the second variable-range piston is disposed in the lower cavity, fixedly connected to the second sealing component via a second connecting rod, and forms a second piston cavity with the central piston.

[0009] The piston rod is provided with a first flow channel and a second flow channel, which are used to alternately inject hydraulic oil into the first piston chamber and the second piston chamber, respectively, so that the hydraulic oil in the first piston chamber pushes the reaction weight upward, and the hydraulic oil in the second piston chamber pushes the reaction weight downward to achieve vibration of the plate assembly.

[0010] During the vibration process, the first and second connecting rods extend and retract according to the vibration frequency of the reaction weight, causing the total volume of the first and second piston chambers to change.

[0011] In one embodiment, the first and second connecting rods extend and retract according to the vibration frequency of the reaction weight, causing a change in the total volume of the first and second piston chambers, including:

[0012] When the vibration frequency of the reaction weight decreases from high to low, the first and second connecting rods contract, causing the total volume of the first and second piston chambers to increase from small to large.

[0013] As the vibration frequency of the reaction weight increases from low to high, the first and second connecting rods extend, causing the total volume of the first and second piston chambers to decrease from large to small.

[0014] When the vibration frequency of the reaction weight remains constant, the lengths of the first connecting rod and the second connecting rod remain constant, so that the total volume of the first piston chamber and the second piston chamber remains constant.

[0015] In one embodiment, the vibrator further includes a servo valve; the servo valve is located on the top plate of the flat plate assembly;

[0016] The servo valve is connected to the first flow channel and the second flow channel;

[0017] The servo valve is used to control the flow of hydraulic oil into the first or second flow channel.

[0018] In one embodiment, the servo valve is a three-position four-way valve.

[0019] Secondly, embodiments of the present invention provide a variable stroke controllable source vibration system, including: a variable stroke controllable source vibrator and a control system module;

[0020] The control system module is used to control the first flow channel and the second flow channel to alternately inject hydraulic oil into the first piston chamber and the second piston chamber, respectively, so that the hydraulic oil in the first piston chamber pushes the reaction weight upward and the hydraulic oil in the second piston chamber pushes the reaction weight downward to achieve vibration of the plate assembly; and during the vibration process, the first connecting rod and the second connecting rod are controlled to extend and retract according to the vibration frequency of the reaction weight, so that the total volume of the first piston chamber and the second piston chamber changes.

[0021] In one embodiment, it further includes: a first stroke controller, a second stroke controller, a flat plate accelerometer, a displacement sensor, and a weight accelerometer;

[0022] The first stroke controller is fixed on the first sealing plug and connected to the first connecting rod, and is used to control the extension and retraction of the first connecting rod;

[0023] The second stroke controller is fixed on the second sealing plug and connected to the second connecting rod, and is used to control the extension and retraction of the second connecting rod;

[0024] The flat plate accelerometer is mounted on the flat plate of the flat plate assembly;

[0025] The displacement sensor is located on the outside of the reaction weight;

[0026] The acceleration sensor of the weight is mounted on the reaction weight;

[0027] The first stroke controller and the second stroke controller, the flat plate accelerometer, the displacement sensor, the accelerometer, and the servo valve are respectively connected to the control system module;

[0028] The control system module sends corresponding control signals to the first stroke controller or the second stroke controller and the servo valve based on the signals fed back from the flat plate acceleration sensor, the displacement sensor and the servo valve.

[0029] In one embodiment, the device includes: a first stroke controller that is an electric screw actuator or a proportional hydraulic valve-driven cylinder device; and / or a second stroke controller that is an electric screw actuator or a proportional hydraulic valve-driven cylinder device.

[0030] In one embodiment, the control system module is further configured to receive a preset reference signal required for excitation; generate a range control signal based on the reference signal; and send the range control signal to the servo valve, the first stroke controller, and the second stroke controller.

[0031] In one embodiment, the control system module is further configured to receive the servo valve displacement signal fed back by the servo valve, the plate acceleration signal fed back by the plate accelerometer, the reaction weight displacement signal fed back by the displacement sensor, and the reaction weight acceleration signal fed back by the acceleration sensor.

[0032] Thirdly, embodiments of the present invention provide a vibration control method for a variable stroke controllable vibration source vibrator, comprising:

[0033] The control system module controls hydraulic oil to alternately enter the first piston chamber and the second piston chamber through the first flow channel and the second flow channel, so that the hydraulic oil in the first piston chamber pushes the reaction weight upward and the hydraulic oil in the second piston chamber pushes the reaction weight downward to achieve vibration of the plate assembly;

[0034] During vibration, the control system module controls the extension and retraction of the first and second connecting rods, so that the total volume of the first and second piston chambers decreases from large to small, and the vibration frequency of the reaction weight increases from low to high; or the total volume of the first and second piston chambers increases from small to large, and the vibration frequency of the reaction weight decreases from high to low.

[0035] In one embodiment, the control system module controls the first and second links to extend and retract according to the vibration frequency of the reaction weight, thereby changing the total volume of the first and second piston chambers.

[0036] In one embodiment, during vibration, the control system module controls the first and second connecting rods to extend and retract according to the vibration frequency of the reaction weight, causing a change in the total volume of the first and second piston chambers, including:

[0037] When the vibration frequency of the reaction weight decreases from high to low, the control system module sends a variable stroke control signal to the first stroke controller and the second stroke controller; the first stroke controller and the second stroke controller control the first connecting rod and the second connecting rod to retract according to the variable stroke control signal, so that the total volume of the first piston chamber and the second piston chamber increases from small to large.

[0038] When the vibration frequency of the reaction weight increases from low to high, the control system module sends a variable stroke control signal to the first stroke controller and the second stroke controller; the first stroke controller and the second stroke controller control the extension of the first connecting rod and the second connecting rod according to the variable stroke control signal, so that the total volume of the first piston chamber and the second piston chamber decreases from large to small.

[0039] When the vibration frequency of the reaction weight remains constant, the control system module sends a variable stroke control signal to the first stroke controller and the second stroke controller; the first stroke controller and the second stroke controller control the length of the first connecting rod and the second connecting rod to remain constant according to the variable stroke control signal, so that the total volume of the first piston chamber and the second piston chamber remains constant.

[0040] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0041] This invention provides a variable stroke controllable vibration source vibrator and system, and a vibration control method. It includes: a flat plate assembly, a reaction weight, a first variable stroke piston, and a second variable stroke piston; the flat plate assembly includes: a top plate, a weight guide post, a flat plate, a piston rod, and a central piston; the central piston is fixedly disposed in the middle of the piston rod; the reaction weight passes through the weight guide post and can move up and down along the post to drive the flat plate assembly to vibrate up and down; the reaction weight has a cavity in its center, the piston rod and the central piston pass through the cavity, and the upper part of the cavity is sealed by a first sealing component, which is fixedly connected to the reaction weight; the lower part of the cavity is sealed by a second sealing component, which is fixedly connected to the reaction weight; the central piston divides the cavity into an upper cavity and a lower cavity; the first variable stroke piston... A plug is disposed in the upper cavity, fixedly connected to the first sealing component via a first connecting rod, and forms a first piston cavity with the central piston; a second variable-stroke piston is disposed in the lower cavity, fixedly connected to the second sealing component via a second connecting rod, and forms a second piston cavity with the central piston; the piston rod is provided with a first flow channel and a second flow channel, which are used to alternately inject hydraulic oil into the first piston cavity and the second piston cavity, respectively, so that the hydraulic oil in the first piston cavity pushes the reaction weight upward, and the hydraulic oil in the second piston cavity pushes the reaction weight downward to achieve vibration of the plate assembly; during vibration, the first connecting rod and the second connecting rod extend and retract according to the vibration frequency of the reaction weight, so that the total volume of the first piston cavity and the second piston cavity changes. The variable-stroke controllable vibration source vibrator provided in this embodiment of the invention extends the vibration stroke of the reaction weight in the existing vibrator structure design. With the increase of the vibration stroke of the reaction weight and the increase of the first piston cavity and the second piston cavity, the high-frequency vibration performance of the controllable vibration source is achieved while taking into account the requirements of the piston cavity during low-frequency and high-frequency vibration of the controllable vibration source, and the vibration performance during broadband excitation of the controllable vibration source is improved.

[0042] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0043] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 This is a structural block diagram of a variable stroke controllable vibration source vibrator provided in an embodiment of the present invention;

[0046] Reference numerals: 1. Control system module; 2. Flat plate assembly; 21. Servo valve; 22. Flat plate acceleration sensor; 23. Central piston; 24. Counterweight guide column; 3. Reaction counterweight; 31. Displacement sensor; 32. Reaction counterweight acceleration sensor; 33. First stroke controller; 34. First connecting rod; 35. First variable stroke piston; 36. Second variable stroke piston; 37. Second connecting rod; 38. Second stroke controller. Detailed Implementation

[0047] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0048] To address the problem that the aforementioned vibrators cannot simultaneously vibrate at high and low frequencies, this invention provides a variable-stroke controllable vibration source vibrator, the structural block diagram of which is shown below. Figure 1 As shown, including:

[0049] The plate assembly 2 includes a reaction weight 3, a first variable-stroke piston 35, and a second variable-stroke piston 36. The plate assembly 2 includes a top plate, a weight guide column 24, a plate, a piston rod, and a central piston 23. The central piston 23 is fixedly disposed in the middle of the piston rod. The reaction weight 3 passes through the weight guide column 24 and can move up and down along the column, causing the plate assembly 2 to vibrate up and down.

[0050] The aforementioned reaction weight 3 moves up and down, for example, it can cause the plate assembly 2 to vibrate up and down through the reaction force.

[0051] The reaction weight 3 has a cavity in the center, through which the piston rod and the central piston 23 pass. The upper part of the cavity is sealed by a first sealing component, which is fixedly connected to the reaction weight 3. The lower part of the cavity is sealed by a second sealing component, which is fixedly connected to the reaction weight 3. The central piston 23 divides the cavity into an upper cavity and a lower cavity.

[0052] The first variable-stroke piston 35 is disposed in the upper cavity, is fixedly connected to the first sealing component through the first connecting rod 34, and forms the first piston cavity A with the central piston 23; the second variable-stroke piston 36 is disposed in the lower cavity, is fixedly connected to the second sealing component through the second connecting rod 37, and forms the second piston cavity B with the central piston 23.

[0053] The piston rod is provided with a first flow channel H and a second flow channel L, which are used to alternately inject hydraulic oil into the first piston chamber A and the second piston chamber B, so that the hydraulic oil in the first piston chamber A pushes the reaction weight 3 to move upward, and the hydraulic oil in the second piston chamber B pushes the reaction weight 3 to move downward, thereby realizing the vibration of the plate assembly 2.

[0054] During the vibration process, the first connecting rod 34 and the second connecting rod 37 expand and contract according to the vibration frequency of the reaction weight 3, causing the total volume of the first piston chamber A and the second piston chamber B to change.

[0055] Specifically, it includes:

[0056] When the vibration frequency of the reaction weight 3 decreases from high to low, the first connecting rod 34 and the second connecting rod 37 contract, causing the total volume of the first piston chamber A and the second piston chamber B to increase from small to large.

[0057] When the vibration frequency of the reaction weight 3 increases from low to high, the first connecting rod 34 and the second connecting rod 37 extend, causing the total volume of the first piston chamber A and the second piston chamber B to decrease from large to small.

[0058] When the vibration frequency of the reaction weight 3 remains unchanged, the lengths of the first connecting rod 34 and the second connecting rod 37 remain unchanged, so that the total volume of the first piston chamber A and the second piston chamber B remains unchanged.

[0059] In general, the total volume of the first piston chamber A and the second piston chamber B changes with the change of the reaction weight 3.

[0060] In one embodiment, to achieve the aforementioned first flow channel H and second flow channel L, hydraulic oil is alternately input into the first piston chamber A and the second piston chamber B. The aforementioned vibrator further includes: a servo valve 21; the servo valve 21 is located on the top plate of the flat plate assembly 2.

[0061] Servo valve 21 is connected to the first flow channel H and the second flow channel L;

[0062] Servo valve 21 is used to control the flow of hydraulic oil into the first flow channel H or the second flow channel L.

[0063] The aforementioned servo valve 21 can be, for example, a three-position four-way valve; the valve core of the servo valve 21 reverses to control the alternating flow of hydraulic oil into the first flow channel H and the second flow channel L.

[0064] Based on the same inventive concept, this embodiment of the invention also provides a variable stroke controllable source vibration system, including: the aforementioned variable stroke controllable source vibrator and control system module 1;

[0065] The control system module 1 is used to control the first flow channel H and the second flow channel L to alternately inject hydraulic oil into the first piston chamber A and the second piston chamber B, so that the hydraulic oil in the first piston chamber A pushes the reaction weight 3 to move upward, and the hydraulic oil in the second piston chamber B pushes the reaction weight 3 to move downward, thereby realizing the vibration of the plate assembly 2; and during the vibration process, the first connecting rod 34 and the second connecting rod 37 are controlled to extend and retract according to the vibration frequency of the reaction weight 3, so that the total volume of the first piston chamber A and the second piston chamber B changes.

[0066] The aforementioned variable stroke controllable vibration source system also includes: a first stroke controller 33, a second stroke controller 38, a flat plate accelerometer 22, a displacement sensor 31, and a weight accelerometer;

[0067] The first stroke controller 33 is fixed on the first sealing plug and connected to the first connecting rod 34, and is used to control the extension and retraction of the first connecting rod 34;

[0068] The second stroke controller 38 is fixed on the second sealing plug and connected to the second link 37, and is used to control the extension and retraction of the second link 37;

[0069] The flat plate accelerometer 22 is mounted on the flat plate of the flat plate assembly 2;

[0070] The displacement sensor 31 is located on the outside of the reaction weight 3;

[0071] The acceleration sensor of the counterweight is set on the reaction counterweight 3;

[0072] The first stroke controller 33 and the second stroke controller 38, the flat plate acceleration sensor 22, the displacement sensor 31, the acceleration sensor and the servo valve 21 are electrically connected to the control system module 1 respectively; the aforementioned first stroke controller 33 can be, for example, an electric screw drive device or a hydraulic cylinder device driven by a proportional hydraulic valve; and / or the second stroke controller 38 can be, for example, an electric screw drive device or a hydraulic cylinder device driven by a proportional hydraulic valve.

[0073] Based on the signals fed back by the flat plate acceleration sensor 22, displacement sensor 31 and servo valve 21, the control system module 1 sends corresponding control signals to the first stroke controller 33 or the second stroke controller 38 and servo valve 21.

[0074] The aforementioned control system module 1 is also used, for example, to receive a preset reference signal required for excitation; to generate a variable range control signal based on the reference signal; to send the variable range control signal to the servo valve 21, the first stroke controller 33, and the second stroke controller 38; and to receive the displacement signal of the servo valve 21 fed back by the servo valve 21, the plate acceleration signal fed back by the plate acceleration sensor 22, the displacement signal of the reaction weight 3 fed back by the displacement sensor 31, and the acceleration signal of the reaction weight 3 fed back by the acceleration sensor.

[0075] The control system module receives and sends signals to determine the current motion state of the vibration system, and uses closed-loop control to keep the vibration system in a state that meets the requirements carried in the range control signal.

[0076] Based on the same inventive concept, embodiments of the present invention also provide a vibration control method for a variable stroke controllable vibration source vibrator, including:

[0077] The control system module 1 controls the hydraulic oil to alternately enter the first piston chamber A and the second piston chamber B through the first flow channel H and the second flow channel L, so that the hydraulic oil in the first piston chamber A pushes the reaction weight 3 to move upward, and the hydraulic oil in the second piston chamber B pushes the reaction weight 3 to move downward, thereby realizing the vibration of the plate assembly 2.

[0078] During the vibration process, the control system module 1 controls the first link 34 and the second link 37 to extend and retract according to the vibration frequency of the reaction weight 3, so that the total volume of the first piston chamber A and the second piston chamber B changes.

[0079] In one embodiment, the control system module 1 controls hydraulic oil to alternately enter the first piston chamber A and the second piston chamber B through the first flow channel H and the second flow channel L. For example, it can be implemented as follows: the control system module 1 sends a range control signal to the servo valve 21, and the servo valve 21 controls the hydraulic oil to alternately enter the first piston chamber A and the second piston chamber B through the first flow channel H and the second flow channel L.

[0080] The aforementioned control system module 1 controls the first link 34 and the second link 37 to extend and retract according to the vibration frequency of the reaction weight 3, thereby changing the total volume of the first piston chamber A and the second piston chamber B, including:

[0081] When the vibration frequency of the reaction weight 3 decreases from high to low, the control system module 1 sends a variable stroke control signal to the first stroke controller 33 and the second stroke controller 38; the first stroke controller 33 and the second stroke controller 38 control the first connecting rod 34 and the second connecting rod 37 to contract according to the variable stroke control signal, so that the total volume of the first piston chamber A and the second piston chamber B increases from small to large.

[0082] When the vibration frequency of the reaction weight 3 increases from low to high, the control system module 1 sends a variable stroke control signal to the first stroke controller 33 and the second stroke controller 38; the first stroke controller 33 and the second stroke controller 38 control the first connecting rod 34 and the second connecting rod 37 to extend according to the variable stroke control signal, so that the total volume of the first piston chamber A and the second piston chamber B decreases from large to small.

[0083] When the vibration frequency of the reaction weight 3 remains unchanged, the control system module 1 sends a variable stroke control signal to the first stroke controller 33 and the second stroke controller 38; the first stroke controller 33 and the second stroke controller 38 control the length of the first connecting rod 34 and the second connecting rod 37 to remain unchanged according to the variable stroke control signal, so that the total volume of the first piston chamber A and the second piston chamber B remains unchanged.

[0084] To further understand the variable stroke controllable vibration source system described above, the following embodiment illustrates its operation:

[0085] When the variable stroke controllable source vibration system is working, the control system module 1 sends a variable stroke control signal to the servo valve 21 and stroke controller 33 of the variable stroke controllable source vibrator. The servo valve 21 reverses according to the variable stroke control signal, and the hydraulic oil enters the first piston chamber A or the second piston chamber B through the first flow channel H or the second flow channel L on the piston rod, pushing the reaction weight 3 to move up and down. The generated reaction force is transmitted to the ground through the piston rod and the plate assembly 2, completing the excitation. At the same time, the stroke controller 33 adjusts the position of the variable stroke piston by controlling the stroke of the first connecting rod 34 and the second connecting rod 37 according to the frequency preset by the variable stroke control signal. During each frequency sweep excitation, the stroke of the first connecting rod 34 and the second connecting rod 37 is the smallest at low frequencies. As the frequency sweep increases, the stroke of the first connecting rod 34 and the second connecting rod 37 continuously increases, reducing the total volume of the first piston chamber A and the second piston chamber B. When using this technology to achieve frequency sweep excitation, the strokes of the first piston chamber A and the second piston chamber B are at their maximum in the low-frequency band, which meets the requirements for low-frequency excitation. As the scanning frequency increases, the strokes of the first piston chamber A and the second piston chamber B continuously decrease, which can also achieve good results for high-frequency excitation.

[0086] This invention provides a variable stroke controllable vibration source vibrator and system, and a vibration control method. It includes: a plate assembly 2, a reaction weight 3, a first variable stroke piston 35, and a second variable stroke piston 36; the plate assembly 2 includes: a top plate, a weight guide post 24, a plate, a piston rod, and a central piston 23; the central piston 23 is fixedly disposed in the middle of the piston rod; the reaction weight 3 passes through the weight guide post 24 and can move up and down along the post, driving the plate assembly 2 to vibrate up and down through the reaction force; the reaction weight 3 has a cavity in its center, the piston rod and the central piston 23 pass through the cavity, and the upper part of the cavity is sealed by a first sealing component, which is fixedly connected to the reaction weight 3; the lower part of the cavity is sealed by a second sealing component, which is fixedly connected to the reaction weight 3; the central piston 23 divides the cavity into an upper cavity and a lower cavity; the first variable stroke piston... The plug 35 is disposed in the upper cavity, fixed to the first sealing component via the first connecting rod 34, and forms the first piston cavity A with the central piston 23; the second variable stroke piston 36 is disposed in the lower cavity, fixed to the second sealing component via the second connecting rod 37, and forms the second piston cavity B with the central piston 23; the piston rod is provided with a first flow channel H and a second flow channel L, which are used to alternately inject hydraulic oil into the first piston cavity A and the second piston cavity B, respectively, so that the hydraulic oil in the first piston cavity A pushes the reaction weight 3 upward, and the hydraulic oil in the second piston cavity B pushes the reaction weight 3 downward to realize the vibration of the plate assembly 2; during the vibration process, the first connecting rod and the second connecting rod extend and retract according to the vibration frequency of the reaction weight, so that the total volume of the first piston cavity and the second piston cavity changes. The variable stroke controllable source vibrator provided in this embodiment of the invention extends the vibration stroke of the reaction weight 3 in the existing vibrator structure design. With the increase of the vibration stroke of the reaction weight 3 and the increase of the first piston chamber A and the second piston chamber B, the high-frequency vibration performance of the controllable source is achieved while taking into account the requirements of the piston chamber when the controllable source vibrates at low and high frequencies, thus improving the vibration performance of the controllable source during broadband excitation.

Claims

1. A variable-stroke controllable vibration source vibrator, characterized in that, include: The plate assembly comprises a plate, a reaction weight, a first variable-stroke piston, and a second variable-stroke piston; the plate assembly includes a top plate, a weight guide post, a plate, a piston rod, and a central piston; the central piston is fixedly disposed in the middle of the piston rod; the reaction weight passes through the weight guide post and can move up and down along the post to drive the plate assembly to vibrate up and down; The reaction weight has a cavity at its center, through which the piston rod and the central piston pass. The upper part of the cavity is sealed by a first sealing component, which is fixedly connected to the reaction weight. The lower part of the cavity is sealed by a second sealing component, which is also fixedly connected to the reaction weight. The central piston divides the cavity into an upper chamber and a lower chamber. The first variable-range piston is disposed in the upper cavity, fixedly connected to the first sealing component via a first connecting rod, and forms a first piston cavity with the central piston; the second variable-range piston is disposed in the lower cavity, fixedly connected to the second sealing component via a second connecting rod, and forms a second piston cavity with the central piston. The piston rod is provided with a first flow channel and a second flow channel, which are used to alternately inject hydraulic oil into the first piston chamber and the second piston chamber, respectively, so that the hydraulic oil in the first piston chamber pushes the reaction weight upward, and the hydraulic oil in the second piston chamber pushes the reaction weight downward to achieve vibration of the plate assembly. During vibration, the first and second connecting rods extend and retract according to the vibration frequency of the reaction weight, causing the total volume of the first and second piston chambers to change.

2. The vibrator as described in claim 1, characterized in that, The first and second connecting rods extend and retract according to the vibration frequency of the reaction weight, causing a change in the total volume of the first and second piston chambers, including: When the vibration frequency of the reaction weight decreases from high to low, the first and second connecting rods contract, causing the total volume of the first and second piston chambers to increase from small to large. As the vibration frequency of the reaction weight increases from low to high, the first and second connecting rods extend, causing the total volume of the first and second piston chambers to decrease from large to small. When the vibration frequency of the reaction weight remains constant, the lengths of the first connecting rod and the second connecting rod remain constant, so that the total volume of the first piston chamber and the second piston chamber remains constant.

3. The vibrator as described in claim 1, characterized in that, The vibrator further includes a servo valve; the servo valve is located on the top plate of the flat plate assembly; The servo valve is connected to the first flow channel and the second flow channel; The servo valve is used to control the flow of hydraulic oil into the first or second flow channel.

4. The vibrator as described in claim 3, characterized in that, The servo valve is a three-position four-way valve.

5. A variable-stroke controllable vibration source system, characterized in that, include: The variable stroke controllable source vibrator and control system module as described in any one of claims 1-4; The control system module is used to control the first flow channel and the second flow channel to alternately inject hydraulic oil into the first piston chamber and the second piston chamber, respectively, so that the hydraulic oil in the first piston chamber pushes the reaction weight upward and the hydraulic oil in the second piston chamber pushes the reaction weight downward to achieve vibration of the plate assembly; and during the vibration process, the first connecting rod and the second connecting rod are controlled to extend and retract according to the vibration frequency of the reaction weight, so that the total volume of the first piston chamber and the second piston chamber changes.

6. The system as described in claim 5, characterized in that, Also includes: First stroke controller, second stroke controller, flat plate accelerometer, displacement sensor and weight accelerometer; The first stroke controller is fixed on the first sealing plug and connected to the first connecting rod, and is used to control the extension and retraction of the first connecting rod; The second stroke controller is fixed on the second sealing plug and connected to the second connecting rod, and is used to control the extension and retraction of the second connecting rod; The flat plate accelerometer is mounted on the flat plate of the flat plate assembly; The displacement sensor is located on the outside of the reaction weight; The acceleration sensor of the weight is mounted on the reaction weight; The first stroke controller and the second stroke controller, the flat plate accelerometer, the displacement sensor, the accelerometer, and the servo valve are all electrically connected to the control system module. The control system module sends corresponding control signals to the first stroke controller or the second stroke controller and the servo valve based on the signals fed back from the flat plate acceleration sensor, the displacement sensor and the servo valve.

7. The system as described in claim 6, characterized in that, include: The first stroke controller is an electric screw drive or a hydraulic cylinder driven by a proportional hydraulic valve; and / or the second stroke controller is an electric screw drive or a hydraulic cylinder driven by a proportional hydraulic valve.

8. The system as described in claim 6, characterized in that, The control system module is also used to receive a preset reference signal required for excitation; generate a range control signal based on the reference signal; and send the range control signal to the servo valve, the first stroke controller, and the second stroke controller.

9. The system as described in claim 6, characterized in that, The control system module is also used to receive the servo valve displacement signal fed back by the servo valve, the plate acceleration signal fed back by the plate acceleration sensor, the reaction weight displacement signal fed back by the displacement sensor, and the reaction weight acceleration signal fed back by the acceleration sensor.

10. A vibration control method for a variable-stroke controllable vibration source system as described in any one of claims 5-9, characterized in that, include: The control system module controls hydraulic oil to alternately enter the first piston chamber and the second piston chamber through the first flow channel and the second flow channel, so that the hydraulic oil in the first piston chamber pushes the reaction weight upward and the hydraulic oil in the second piston chamber pushes the reaction weight downward to achieve vibration of the plate assembly; During vibration, the control system module controls the first and second connecting rods to extend and retract according to the vibration frequency of the reaction weight, causing the total volume of the first and second piston chambers to change.

11. The method as described in claim 10, characterized in that, The control system module controls hydraulic oil to alternately enter the first piston chamber and the second piston chamber through the first flow channel and the second flow channel, including: the control system module sends a range control signal to the servo valve, and the servo valve controls hydraulic oil to alternately enter the first piston chamber and the second piston chamber through the first flow channel and the second flow channel.

12. The method as described in claim 10, characterized in that, During the vibration process, the control system module controls the first and second connecting rods to extend and retract according to the vibration frequency of the reaction weight, causing a change in the total volume of the first and second piston chambers, including: When the vibration frequency of the reaction weight decreases from high to low, the control system module sends a variable stroke control signal to the first stroke controller and the second stroke controller; the first stroke controller and the second stroke controller control the first connecting rod and the second connecting rod to retract according to the variable stroke control signal, so that the total volume of the first piston chamber and the second piston chamber increases from small to large. When the vibration frequency of the reaction weight increases from low to high, the control system module sends a variable stroke control signal to the first stroke controller and the second stroke controller; the first stroke controller and the second stroke controller control the extension of the first connecting rod and the second connecting rod according to the variable stroke control signal, so that the total volume of the first piston chamber and the second piston chamber decreases from large to small. When the vibration frequency of the reaction weight remains constant, the control system module sends a variable stroke control signal to the first stroke controller and the second stroke controller; the first stroke controller and the second stroke controller control the length of the first connecting rod and the second connecting rod to remain constant according to the variable stroke control signal, so that the total volume of the first piston chamber and the second piston chamber remains constant.

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