Vibration control device and control method for a plate shell structure based on piezoelectric stacks

Abstract

The application provides a vibration control device and control method based on a plate shell structure of a piezoelectric stack, the device comprising: a tuned mass damper, a piezoelectric stack arranged in sequence from near to far from the plate shell structure, the output point end of the piezoelectric stack being connected to the tuned mass damper, and the other end being electrically connected to a controller; the piezoelectric stack and the tuned mass damper are both fixedly connected to the inner wall of the interlayer of the plate shell structure; the tuned mass damper comprises: a base, a vibration absorbing body, a rubber block and a mass block, the base is fixedly connected to the plate shell structure, and the vibration absorbing body is adhesively connected to the base; the rubber block is abuttingly connected to the mass block, a through hole is formed in the center of the rubber block and the mass block, a center shaft rod is arranged in the inner diameter of the through hole, and the center shaft rod penetrates through the mass block and the rubber block. The application is used for the plate shell structure, when vibration occurs between the plate shell, the vibration transmission reliability is ensured through the center shaft rod, and the vibration is absorbed and effectively inhibited through the piezoelectric stack and the tuned mass damper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration control in structural engineering, in particular to a vibration control device and method for a plate shell structure based on piezoelectric stack. BACKGROUND

[0002] As an important structural form in engineering design, plate shell structure is widely used in civil engineering, military industry, aviation and shipbuilding fields due to its light weight, convenient processing and good designability. In recent years, with the rapid development of manufacturing technology, especially the urgent needs of high-tech fields such as navigation and spaceflight, the requirements of engineering structures for light weight, high strength and high performance are increasingly improved.

[0003] However, light weight and high strength structures are usually very sensitive to vibration and noise problems, and plate shell structures are no exception. Under the excitation of complex external loads, plate shell structures may resonate, which is harmful to the stability of the structure. Especially in the fields of aerospace and marine vessels, the fluid has a huge impact on the outer shell, i.e. the plate shell structure, when the aircraft and ships are running at high speed, which makes them emit loud noise and affect the safety of the structure. For some special equipment, there are also requirements for concealment, which further requires technical means to suppress the vibration of plate shell structures, reduce noise, prolong service life and ensure safety in use.

[0004] Currently, the main vibration control methods for plate shell structures include increasing structural stiffness, adjusting natural frequency, setting isolation bearings, etc., i.e. consuming the excitation energy input from the outside by the structure itself to achieve the vibration reduction goal. However, the above methods gradually show various drawbacks in practical application, i.e. the effect of vibration reduction by structural stiffness is very limited, and the structure reinforcement will result in huge cost and poor control stability.

[0005] In summary, the current vibration control problem of plate shell structures needs to be solved urgently. SUMMARY

[0006] In view of this, the purpose of the present application is to provide a vibration control device for a plate shell structure based on piezoelectric stack, which is installed on the inner wall of the sandwich layer of the plate shell structure to further improve the vibration suppression effect, and is flexible in disassembly and can change the style according to different plate shell structures. When the plate shell structure is excited by external excitation and vibrates, the bolt steel rod and the vibration absorber ensure the stability of vibration transmission, the tuned mass damper absorbs and eliminates the vibration of the plate shell structure, and the piezoelectric stack connected with the tuned mass damper applies an external force on the mass block through the signal given by the controller to achieve better vibration suppression effect, thereby effectively controlling the vibration of the plate shell structure, reducing the occurrence of structural damage due to resonance, and enhancing the comfort and concealment of the plate shell structure.

[0007] The application provides a vibration control device based on a plate shell structure of a piezoelectric stack, comprising:

[0008] A tuned mass damper is arranged on the plate shell structure in sequence from near to far, and a piezoelectric stack is arranged on the plate shell structure in sequence from near to far, the output point end of the piezoelectric stack is connected to the tuned mass damper, and the other end is electrically connected to a controller (the piezoelectric stack is connected to the controller through a cable), the piezoelectric stack and the tuned mass damper are fixed (preferably through a bolt steel rod) and connected to the inner wall of the sandwich layer of the plate shell structure.

[0009] The tuned mass damper comprises a base, a vibration absorbing body, a rubber block and a mass block arranged on the plate shell structure in sequence from near to far, the base is fixedly connected to the plate shell structure, the vibration absorbing body is adhesively connected to the base, so that the vibration response of the structure is better transmitted to the device, the rubber block is abuttingly connected to the mass block (the rubber block is placed on the vibration absorbing body, and the mass block is stacked on the rubber block), a through hole is formed in the center of the rubber block and the mass block (the diameter of the center shaft rod is smaller than the diameter of the through hole), a center shaft rod is arranged in the inner diameter of the through hole, the center shaft rod penetrates through the mass block and the rubber block, so that the mass block and the rubber block do not lose stability in the vibration response process, and the rubber block continuously consumes energy in the vibration response process of the structure and plays a vibration reduction effect.

[0010] Further, the piezoelectric stack comprises a plurality of annular piezoelectric stacks arranged in parallel with each other.

[0011] The output point end of the annular piezoelectric stack is connected to a circular small base on the upper part of the mass block, and the other end of the annular piezoelectric stack is electrically connected to the controller.

[0012] The bottom surface of the mass block has a layer of steel gasket, and a small base on the steel gasket is connected to the output point of the piezoelectric stack.

[0013] A vibration sensor is attached to the inner wall of the sandwich layer of the plate shell structure, the vibration sensor is signal-connected to the controller, and the vibration sensor is electrically connected (through a circuit) to the piezoelectric stack; the vibration sensor detects the vibration response signal generated by the plate shell structure, transmits the signal to the controller, and the controller controls the size of the external force applied by the annular piezoelectric stack to the mass block according to the vibration signal.

[0014] The fixing screw can be tightened on the center shaft rod, so that the vibration of the plate shell structure is transmitted to the steel plate of the rotating control device and the vibration absorbing body, the rubber block is compressed after absorbing the initial unstable vibration of the plate shell structure, the distance from the force point of the piezoelectric stack to the base is lengthened, a certain pre-tension is applied to the piezoelectric stack, and the pre-tension is offset by inputting a small current to the piezoelectric stack.

[0015] Furthermore, a force sensor is fixedly connected to the top of the piezoelectric stack, and the force sensor is fixedly connected to the inner wall of the sandwich structure of the plate shell.

[0016] Furthermore, the bottom surface of the base is either curved or flat, the base is a hollow structure, and the central shaft passes through the space between the base and the inner wall of the shell structure.

[0017] Furthermore, two fixing screws are provided on the outer side of the tuned mass damper, and the nuts on the two fixing screws are screwed in to the same length. A middle plate is provided above the tuned mass damper, and a bottom plate is provided below the tuned mass damper. A top plate is provided above the piezoelectric stack. In this invention, the horizontal bottom plate, middle plate, top plate, and vertical rods constitute the frame of the vibration control device.

[0018] Furthermore, adjustment plates are respectively provided at both ends of the central shaft of the mass block, and fixing screws are embedded in the adjustment plates; considering the stability of the device during vibration control, the adjustment plates and the fixing screws maintain a suitable error distance to prevent deformation caused by squeezing or collision.

[0019] Furthermore, the piezoelectric stack is placed directly on the inner wall of the sandwich structure of the plate shell, omitting the tuned mass damper. A base is provided at the lower end of the piezoelectric stack, and the base is fixedly connected (preferably by bolts) to the inner wall of the sandwich structure of the plate shell.

[0020] Furthermore, the base is fixedly connected to the shell structure in the following manner:

[0021] Countersunk holes are pre-drilled in the plate structure, and the base is connected to the plate structure using hexagon countersunk screws.

[0022] Furthermore, the piezoelectric stack is fixedly connected to the force sensor by means of epoxy resin adhesive.

[0023] The force sensor is fixedly connected to the inner wall of the sandwich structure by bolts.

[0024] The present invention also provides a vibration control method for a plate and shell structure based on piezoelectric stacks, applicable to the vibration control device for the plate and shell structure based on piezoelectric stacks as described above, comprising:

[0025] Vibration response signals of the plate and shell structure are detected by vibration sensors. These signals are then input into the DSpace simulation system software for analysis using optimization algorithms. The resulting electrical signals are then transmitted to the controller to control the magnitude of the external force applied by the piezoelectric stack to the mass block.

[0026] Calculate the tuning frequency of the tuned mass damper according to the tuning formula;

[0027] According to the frequency spectrum of the plate shell structure to be damped, the tuning frequency of the tuned mass damper between the base and the intermediate plate is designed to be near the frequency of the structure to be damped, so that the device has better damping effect without power supply;

[0028] According to the force value of the force sensor, the pre-stress of the piezoelectric stack applied to the tuned mass damper is designed;

[0029] When the vibration response frequency of the plate shell structure to be damped is close to or even consistent with the designed tuning frequency of the tuned mass damper, the piezoelectric stack does not need to apply an external force to the mass block, and the piezoelectric stack has a displacement following the vibration but no control force.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] The present application proposes a vibration control device and control method for plate shell structures based on piezoelectric stacks, which combines passive tuned mass damper, piezoelectric stack and active control system to form a vibration control scheme, has multiple energy dissipation and damping measures, and the tuned mass damper can still provide better damping effect under a certain vibration frequency spectrum of the plate shell structure without power supply, and even only a small current is needed to further optimize and improve the damping effect when power is supplied; The tuned mass damper in the present application can be self-assembled before installation, and the required rubber block and mass block can be selected, which is flexible and convenient and has wide applicability; The active control system based on piezoelectric stacks used in the present application can adjust the size of the external force applied by the piezoelectric stack to the mass block according to the real-time vibration state of the controlled structure, so as to achieve the optimal control effect; The vibration control device of the present application can select single or multiple settings according to external conditions and vibration control requirements, and can be single applied to the vibration control of plate shell structure, or multiple parallel settings can be used in the inner wall of the sandwich structure of plate shell structure, and the setting position can be selected according to the condition requirement; At the same time, the length of the rod connecting each plate member of the plate shell structure can be adjusted arbitrarily, so that the installation and use mode is flexible and adjustable, and the application performance is superior, which can be applied to the plate shell structure of large buildings, and also can be applied to the plate shell structure in the fields of aerospace, aviation and marine engineering. BRIEF DESCRIPTION OF DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not considered as limiting the application.

[0033] In the drawings:

[0034] Figure 1A schematic diagram of the vibration control device based on a piezoelectric stack plate and shell structure provided in an embodiment of the present invention;

[0035] Figure 2 A cross-sectional schematic diagram of a passively tuned mass damper provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the vibration control device of the present invention applied to the inner wall of the sandwich structure of a plate shell.

[0037] The markings in the attached figure are as follows:

[0038] 1. Rubber block; 2. Mass block; 3. Piezoelectric stack; 4. Controller; 5. Vibration sensor; 6. Force sensor; 21. Base plate; 22. Intermediate plate; 24. Annular steel sleeve; 26. Top plate; 31. Vibration absorber; 41. Socket head screw; 51. Central shaft; 52. Adjusting plate; 53. Fixing screw. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0040] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0041] It should be understood that although the terms first, second, and third may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0042] The specific implementation steps of the embodiments of the present invention are described below with reference to the accompanying drawings:

[0043] This invention provides a vibration control device for a plate and shell structure based on piezoelectric stacks. See [link to relevant documentation].Figure 1 、 2 As shown in the figure, it comprises:

[0044] The tuned mass damper is arranged in sequence from near to far on the plate shell structure, the output point end of the piezoelectric stack 3 is connected to the tuned mass damper, the other end of the piezoelectric stack 3 is connected to the controller 4 through a cable; the piezoelectric stack 3 and the tuned mass damper are both connected to the inner wall of the sandwich layer of the plate shell structure through a bolt steel rod, and the inner wall of the sandwich layer of the plate shell structure is shown in the figure; Figure 3

[0045] The tuned mass damper comprises a base, a vibration absorber 31, a rubber block 1 and a mass block 2 arranged in sequence from near to far on the plate shell structure, the base is fixedly connected to the plate shell structure, and the vibration absorber 31 is adhesively connected to the base, so that the vibration response of the structure is better transmitted to the device; the rubber block 1 is placed on the vibration absorber 31, and the mass block 2 is stacked on the rubber block 1, a through hole is formed in the center of the rubber block 1 and the mass block 2, the diameter of the center shaft rod is smaller than the diameter of the through hole, a center shaft rod 51 is arranged in the inner diameter of the through hole, and the center shaft rod 51 penetrates through the mass block 2 and the rubber block 1, so that the mass block 2 and the rubber block 1 do not lose stability during the vibration response process; the rubber block 1 continuously dissipates energy during the vibration response process of the structure, thereby achieving the effect of vibration reduction.

[0046] The piezoelectric stack 3 comprises a plurality of annular piezoelectric stacks arranged in parallel;

[0047] In this embodiment, the annular piezoelectric stack is formed by a compression stack of piezoelectric materials, and is protected by an annular steel sleeve 24; after receiving the electrical signal input by the controller 4, an external force is applied to the mass block 2, thereby achieving the effect of actively controlling the vibration of the structure.

[0048] The output point end of the annular piezoelectric stack is connected to a circular small base on the upper part of the mass block 2, and the other end of the annular piezoelectric stack is electrically connected to the controller 4;

[0049] The bottom surface of the mass block 2 has a layer of steel gasket, and the small base on the steel gasket is connected to the output point of the piezoelectric stack 3;

[0050] In this embodiment, the annular piezoelectric stack penetrates the middle plate 22 and is directly connected to the mass block 2, applies an external force to the tuned mass damper, and achieves a better vibration reduction effect.

[0051] ​The vibration sensor 5 is attached to the inner wall of the sandwich layer of the plate shell structure, and is signal connected with the controller 4, and is connected with the piezoelectric stack 3 through an electric circuit; the vibration sensor 5 detects the vibration response signal generated by the plate shell structure, and transmits the signal to the controller 4, and the controller 4 controls the size of the external force applied to the mass block 2 by the ring-shaped piezoelectric stack according to the vibration signal.

[0052] Two fixed screw rods 53 are arranged on the outside of the tuned mass damper, and the lengths of the nuts of the two fixed screw rods 53 are the same. An intermediate plate 22 is arranged above the tuned mass damper, a bottom plate 21 is arranged below the tuned mass damper, and a top plate 26 is arranged above the piezoelectric stack 3. In this embodiment, the transverse bottom plate 21, the intermediate plate 22, the top plate 26 and the longitudinal rod constitute the frame of the vibration control device.

[0053] The two ends of the central shaft of the mass block 2 are respectively provided with an adjusting plate 52 embedded with a fixed screw; in consideration of the stability of the device in the vibration control process, the adjusting plate 52 and the fixed screw rod 53 maintain a suitable error distance to prevent deformation caused by extrusion collision;

[0054] The fixed screw can be tightened on the central shaft, so that the vibration of the plate shell structure is transmitted to the steel plate of the rotation control device and the vibration absorbing body 31. After the rubber block 1 absorbs the initial unstable vibration of the plate shell structure, it is compressed by the mass block 2, so that the distance from the force point of the piezoelectric stack 3 to the base is lengthened, and a certain pre-tension is applied to the piezoelectric stack 3, which is offset by inputting a small current to the piezoelectric stack 3.

[0055] The top of the piezoelectric stack 3 is fixedly connected with a force sensor 6, and the force sensor 6 is fixedly connected to the inner wall of the sandwich layer of the plate shell structure.

[0056] The bottom surface of the base is of a curved surface or a plane, the base is a hollow structure, and the central shaft is connected between the base and the inner wall of the sandwich layer of the plate shell structure.

[0057] The piezoelectric stack 3 is directly placed on the inner wall of the sandwich layer of the plate shell structure, and the tuned mass damper is omitted. The lower end of the piezoelectric stack 3 is provided with a base, and the base is fixedly connected to the inner wall of the sandwich layer of the plate shell structure by a bolt.

[0058] The type of fixed connection of the base and the plate shell structure is:

[0059] A countersunk hole is formed in advance on the plate shell structure, and a hexagonal countersunk screw 41 is used to connect the base and the plate shell structure.

[0060] The piezoelectric stack 3 is fixedly connected with the force sensor 6 by epoxy resin bonding;

[0061] The force sensor 6 is fixedly connected with the inner wall of the sandwich structure by bolt connection.

[0062] The embodiment of the present application also provides a vibration control method of a piezoelectric stack-based sandwich structure, which is applied to the piezoelectric stack-based sandwich structure vibration control device as described above and comprises the following steps of:

[0063] A vibration response signal of the sandwich structure is detected by the vibration sensor 5, and the vibration response signal is input into a DSpace simulation system software for analysis by an optimization algorithm, and an electric signal is output to the controller 4 to control the piezoelectric stack 3 to apply an external force to the mass block 2.

[0064] The tuning frequency of the tuned mass damper is calculated according to a tuning formula;

[0065] According to the frequency spectrum of the vibration of the sandwich structure to be damped, the tuning frequency of the tuned mass damper between the base and the middle plate 22 is designed to be close to the vibration frequency of the structure, so that the device has a better damping effect without power supply.

[0066] The piezoelectric stack 3 applies a pre-stress to the tuned mass damper according to the force value of the force sensor 6;

[0067] When the vibration response frequency of the sandwich structure to be damped is close to or even consistent with the designed tuning frequency of the tuned mass damper, the piezoelectric stack 3 does not need to apply an external force to the mass block 2, and the piezoelectric stack 3 has a displacement following the vibration but no control force.

[0068] So far, the technical scheme of the present application has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make any changes or replacements to the related technical features without departing from the principles of the present application, and the technical scheme after the changes or replacements will fall within the protection scope of the present application.

[0069] The above description is only the preferred embodiments of the present application and is not used to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, replacement or improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A vibration control device based on a plate shell structure of piezoelectric stacks, characterized by, The application relates to a vibration control device based on a piezoelectric stack for a plate-shell structure. The vibration control device comprises a tuned mass damper, a piezoelectric stack, a vibration sensor and a force sensor. The piezoelectric stack is arranged on the plate-shell structure in sequence from near to far. The tuned mass damper comprises a base, a vibration-absorbing body, a rubber block and a mass block. The piezoelectric stack comprises a plurality of annular piezoelectric stacks arranged in parallel. The vibration sensor is attached to the inner wall of the sandwich layer of the plate-shell structure. The vibration sensor is signal-connected to the controller and electrically connected to the piezoelectric stack. The vibration sensor detects the vibration response signal generated by the plate-shell structure and transmits the signal to the controller. The controller controls the size of the external force applied to the mass block by the annular piezoelectric stack according to the vibration signal.

2. The piezoelectric stack based panel shell structure vibration control device of claim 1, wherein, The top of the piezoelectric stack is fixedly connected with the force sensor. The force sensor is fixedly connected to the inner wall of the sandwich layer of the plate-shell structure by a bolt.

3. The piezoelectric stack based panel shell structure vibration control apparatus of claim 1, wherein, The two ends of the central shaft of the mass block are respectively provided with adjusting plates embedded with fixing screws.

4. The piezoelectric stack-based panel shell structure vibration control apparatus according to claim 1, characterized by, The fixing screws can be tightened on the central shaft, so that the vibration of the plate-shell structure is transmitted to the steel plate of the rotating control device and the vibration-absorbing body.

5. The piezoelectric stack-based panel shell structure vibration control apparatus according to claim 1, characterized by, The rubber block is compressed after absorbing the initial unstable vibration of the plate-shell structure, so that the distance from the force point of the piezoelectric stack to the base is lengthened, and a certain pre-tension is applied to the piezoelectric stack, which is offset by inputting a small current.

6. The piezoelectric stack-based panel shell structure vibration control apparatus according to claim 1, characterized by, The bottom surface of the base is curved or flat. The base is a hollow structure, and the central shaft connects the inner wall of the sandwich layer of the plate-shell structure.

7. A method of vibration control of a plate shell structure based on piezoelectric stacks, characterized by Two fixing screws are arranged outside the tuned mass damper. The piezoelectric stack is directly placed on the inner wall of the sandwich layer of the plate-shell structure. The lower end of the piezoelectric stack is provided with a base fixedly connected to the inner wall of the sandwich layer of the plate-shell structure. The base is fixedly connected to the plate-shell structure by a hexagonal socket head screw. The application is applied to the vibration control device based on the piezoelectric stack for the plate-shell structure. The vibration response signal of the plate-shell structure is detected by a vibration sensor, the vibration response signal is input into a DSpace simulation system software for analysis by an optimization algorithm, and an electric signal is output to a controller to control the piezoelectric stack to apply an external force to the mass block; The tuning frequency of the tuned mass damper is calculated according to a tuning formula; The tuning frequency of the tuned mass damper between the base and the intermediate plate is designed to be near the frequently-vibrated frequency of the plate-shell structure according to the frequency spectrum of the frequently-vibrated plate-shell structure; The piezoelectric stack applies a pre-stress to the tuned mass damper according to the force value of the force sensor; When the vibration response frequency of the plate-shell structure to be damped is close to or even consistent with the designed tuning frequency of the tuned mass damper, the piezoelectric stack does not need to apply an external force to the mass block.

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