Flexible piezoelectric fiber composite material sensing-driving cooperative device

Abstract

The invention discloses a flexible piezoelectric fiber composite material sensing-driving synergistic device, and relates to the field of piezoelectric functional materials, the device comprises a first packaging film, a second packaging film and a piezoelectric fiber composite material layer; the first packaging film and the second packaging film are respectively provided with an upper electrode and a lower electrode; the piezoelectric fiber composite material layer is divided into a driving area and a sensing area along the length direction; fibers in the driving area are polarized in the length direction, and corresponding upper and lower electrodes are interdigital electrodes arranged in the fiber polarization direction, so that the driving area works in a d33 mode; the fibers in the sensing area are polarized along the thickness direction, and the corresponding upper and lower electrodes are of transverse strip-shaped, ring-shaped or island-shaped structures, so that the sensing area works in a d31 mode so as to make thickness-direction response to in-plane strain generated by the driving area and perform electromechanical response to stress waves propagated inside. According to the invention, physical separation of in-plane driving and thickness direction sensing is realized in a monolithic structure, and the dual requirements of high-precision driving and high-frequency guided wave detection are met.

Description

Technical Field

[0001] This application relates to the field of piezoelectric functional materials, and in particular to a flexible piezoelectric fiber composite material sensor-driven co-drive device. Background Technology

[0002] Piezoelectric fiber composites are widely used in deformation control, vibration control, and condition monitoring of thin-walled structures due to their high flexibility, strong adhesion, and electromechanical coupling efficiency. Macro-fiber composites (MFCs) are a typical type of device, which arrange piezoelectric ceramic fibers in a flexible matrix and use symmetrical interdigitated electrodes to excite d 33 The mode achieves a large in-plane strain output. Although piezoelectric materials possess both direct and inverse piezoelectric effects in their physical properties, the polarization, electrode configuration, and interlayer structure of traditional MFCs are all designed with driving output as the core objective. This requires applying high voltages of several kilovolts or more to form a strong electric field. Their "high voltage, low current" driving method causes the driving field to dominate the electromechanical coupling within the fiber, and the driving signal is much larger than the charge generated by the structural response, completely drowning out potential sensing signals. Therefore, traditional MFCs do not have the ability to simultaneously undertake driving and sensing functions at the structural level.

[0003] In traditional MFCs, the interdigitated electrodes directly cover the surface of ceramic fibers, resulting in significant abrupt changes in the electric field boundary at the electrode tips. This creates localized high-field regions at the fingertips, far exceeding the average electric field, which can easily induce charge accumulation, interfacial microcracks, and even local breakdown. Furthermore, the elastic modulus and dielectric properties of the copper electrodes and ceramic fibers differ greatly, disrupting the electric field, stress, and dielectric continuity at the electrode-fiber interface. This leads to a distinct peak-valley characteristic in the electric field distribution within the fibers: some fibers are in excessively high electric field regions, while others are in low or even near-zero field regions, limiting the number of effective electromechanical coupling fibers. This electric field inhomogeneity not only reduces driving efficiency but also causes inconsistent fiber charging, restricting the structure's ability to handle large strains. Simultaneously, the inherent hysteresis nonlinearity of piezoelectric materials creates a complex nonlinear mapping between output and input. Traditional feedforward compensation methods rely on operating condition-sensitive parameters, and inverse model solutions introduce additional time delays, making residual driving errors difficult to avoid. As thin-walled structures increasingly demand high-strain drive, large driving force output, and real-time precision control, traditional structures, due to uneven electric field distribution, lack of independent feedback channels, and difficulty in suppressing hysteresis residual errors, cannot meet the dual requirements of "uniform electric field distribution + separable feedback" for high-precision and high-performance drive scenarios.

[0004] In the field of structural health monitoring, non-destructive testing methods based on Lamb waves or high-frequency stress waves require excitation and receiving units to have a certain spacing, directionality, and acoustic boundaries that match the structure on the structural surface. Traditional microfiber oscillators (MFCs) are designed with the electrode configuration, polarization direction, and interface acoustic properties all centered around the driving function. A significant difference in acoustic impedance exists between the rigid metal electrodes and ceramic fibers, inevitably causing interface scattering, pseudo-reflection, and mode redistribution during high-frequency stress wave propagation, interfering with the amplitude, phase, and modal characteristics of the guided wave signal. Furthermore, the strong electric field and high-amplitude electromechanical coupling response generated by high-voltage driving further mask weak high-frequency signals, making it difficult for the same material to simultaneously perform excitation and reception tasks. Although piezoelectric materials possess a dual-effect mechanism, the driving and sensing components in traditional MFC structures share the same coupling path, and their high-frequency acoustic boundary characteristics are insufficient to support high-fidelity guided wave detection. As the demand for flexible piezoelectric devices continues to increase in applications such as large strain driving, real-time feedback, high-precision control, and high-frequency guided wave detection, problems such as electric field concentration, electric field non-uniformity, driving interference sensing, lack of independent electromechanical coupling path, and severe high-frequency scattering in traditional structures are becoming increasingly prominent.

[0005] Therefore, a new structure is needed to ensure that the driving and sensing do not interfere with each other in the electromechanical coupling direction, electric field environment and acoustic boundary, so as to simultaneously meet the dual requirements of high-precision control and guided wave detection in a single device. Summary of the Invention

[0006] The purpose of this application is to provide a flexible piezoelectric fiber composite material sensing and actuation device that can simultaneously realize actuation and sensing functions in the same device.

[0007] To achieve the above objectives, this application provides a flexible piezoelectric fiber composite material sensing and driving co-operating device, comprising: a first encapsulation film, a second encapsulation film, and a piezoelectric fiber composite material layer; the piezoelectric fiber composite material layer is located between the first encapsulation film and the second encapsulation film; Both the first encapsulation film and the second encapsulation film are flexible circuit boards, and the first encapsulation film is provided with an upper electrode, and the second encapsulation film is provided with a lower electrode; The piezoelectric fiber composite material layer is divided into a driving region and a sensing region along its length; The piezoelectric ceramic fibers in the driving region are polarized along their length, and the upper and lower electrodes corresponding to the driving region are symmetrically arranged interdigitated electrodes along the polarization direction of the piezoelectric ceramic fibers, so that the driving region operates at d 33 The pattern is designed to induce in-plane strain. The piezoelectric ceramic fibers within the sensing region are polarized along the thickness direction, and the upper and lower electrodes corresponding to the sensing region have transverse strip, ring, or island-like structures, enabling the sensing region to operate at d 31The mode is configured to respond in the thickness direction to in-plane strain generated in the driving region and to provide an electromechanical response to stress waves propagating in the sensing region.

[0008] In one embodiment, the flexible piezoelectric fiber composite sensing and driving co-operation device further includes an adhesive layer; the adhesive layer is located between the first encapsulation film and the piezoelectric fiber composite material layer and between the second encapsulation film and the piezoelectric fiber composite material layer.

[0009] In one embodiment, the length of the sensing area With the length of the driving region The ratio satisfies: .

[0010] In one embodiment, the center distance between the driving area and the sensing area is... satisfy: And the center distance Simultaneously, it meets the electrical insulation distance requirements under the maximum design drive voltage applied to the drive region; among which... The wavelength of the flexible piezoelectric fiber composite material sensing and driving device at a preset detection frequency.

[0011] In one embodiment, the surface of the driving region is provided with a groove corresponding to the interdigital region of the interdigital electrode. The extension direction of the groove is perpendicular to the elongation direction of the piezoelectric ceramic fiber. The groove is filled with a conductive material to form a heterogeneous electrode structure of electrode-filler-piezoelectric ceramic fiber.

[0012] In one embodiment, the depth of the groove With respect to the thickness of the piezoelectric fiber composite layer satisfy: The width of the groove With slot pitch satisfy: .

[0013] In one embodiment, the equivalent bending stiffness caused by the recessed portion within the drive region Bending stiffness of the ungrooved portion The ratio satisfies: .

[0014] In one embodiment, the conductive material is a conductive polymer or a conductive composite material.

[0015] In one embodiment, the piezoelectric fiber composite material layer includes piezoelectric ceramic fibers and a polymer matrix; the piezoelectric ceramic fibers and the polymer matrix are arranged alternately in sequence.

[0016] In one embodiment, the elastic modulus of the conductive material satisfy: ;in, This represents the elastic modulus of the polymer matrix. The equivalent elastic modulus of the piezoelectric fiber composite layer. The modulus of piezoelectric ceramic fibers.

[0017] According to the specific embodiments provided in this application, this application has the following technical effects: by constructing two independent electromechanical coupling regions, the driving region and the sensing region, on the same piezoelectric fiber composite material layer, and by comprehensively adopting the differences in polarization direction and electrode configuration, the driving region and the sensing region are physically distinguished in terms of electromechanical coupling path, dominant frequency band, and acoustic boundary. Thus, in-plane driving and thickness direction sensing are physically separated in a monolithic structure, meeting the dual requirements of high-precision driving and high-frequency guided wave detection. It can be used for deformation control, vibration monitoring, and guided wave detection of thin-walled structures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the flexible piezoelectric fiber composite material sensor-driven co-drive device provided in this application.

[0020] Figure 2 This is a schematic diagram showing the functional distribution of the driving area and the sensing area along the length of the device in one embodiment of this application.

[0021] Figure 3 This is a schematic diagram of a piezoelectric fiber composite material layer in one embodiment of this application.

[0022] Figure 4 This is a typical test diagram of the sensor-driven collaborative working mode in one embodiment of this application.

[0023] Figure 5 This image shows a comparison between the real-time sensing of the structural state during the driving process and the results of the external laser displacement sensor.

[0024] Reference numerals: 101-First encapsulation film, 102-Adhesive layer, 103-Second encapsulation film, 104-Lower electrode corresponding to the sensing area, 105-Lower electrode corresponding to the driving area, 106-Piezoelectric fiber composite material layer, 107-Upper electrode corresponding to the driving area, 108-Upper electrode corresponding to the sensing area, 201-Sensing area, 202-Driving area, 301-Piezoelectric ceramic fiber, 302-Polymer matrix, 303-Groove, 401-Signal generator, 402-High voltage amplifier, 403-Flexible piezoelectric fiber composite sensing-driving co-function device, 404-Laser displacement sensor, 405-Charge amplifier, 406-Multi-channel oscilloscope. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The purpose of this application is to form two types of electromechanical paths on a single material: low-frequency thickness-oriented electromechanical response and high-frequency guided wave coupling, so as to achieve physical separation between in-plane actuation in the driving area and signal acquisition in the sensing area. This can be used for deformation control, vibration monitoring and guided wave detection of thin-walled structures.

[0027] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] In one exemplary embodiment, such as Figure 1 As shown, a flexible piezoelectric fiber composite material sensing and driving co-operation device is provided, including: a first encapsulation film 101, a second encapsulation film 103, and a piezoelectric fiber composite material layer 106. The piezoelectric fiber composite material layer 106 is located between the first encapsulation film 101 and the second encapsulation film 103.

[0029] The flexible piezoelectric fiber composite material sensor-driven co-driving device further includes an adhesive layer 102. The adhesive layer 102 is located between the first encapsulation film 101 and the piezoelectric fiber composite material layer 106, and between the second encapsulation film 103 and the piezoelectric fiber composite material layer 106.

[0030] Flexible piezoelectric fiber composite sensing and actuation devices can be attached to the surface of thin-walled structures for deformation regulation, vibration control, and structural response monitoring.

[0031] In a specific application example, both the first encapsulation film 101 and the second encapsulation film 103 are flexible circuit boards, and the first encapsulation film 101 is provided with an upper electrode, while the second encapsulation film 103 is provided with a lower electrode. Both the upper and lower electrodes are copper electrodes. The upper electrode on the first encapsulation film 101 includes an upper electrode 107 corresponding to the driving area and an upper electrode 108 corresponding to the sensing area. The lower electrode on the second encapsulation film 103 includes a lower electrode 104 corresponding to the sensing area and a lower electrode 105 corresponding to the driving area.

[0032] Specifically, the inner side of the first encapsulation film 101 is formed with a flexible circuit board process to form an upper electrode, and the inner side of the second encapsulation film 103 is formed with a flexible circuit board process to form a lower electrode.

[0033] like Figure 2 As shown, the piezoelectric fiber composite material layer 106 is divided into a driving region 202 and a sensing region 201 along its length.

[0034] The piezoelectric ceramic fibers within the driving region 202 are polarized along their length, and the upper and lower electrodes corresponding to the driving region 202 are symmetrically arranged interdigitated electrodes along the polarization direction of the piezoelectric ceramic fibers, enabling the driving region 202 to operate in d... 33 The pattern is used to induce in-plane strain.

[0035] Specifically, the upper and lower interdigital electrodes corresponding to the driving region 202 are respectively disposed inside the first encapsulation film 101 and the second encapsulation film 103, and are arranged in a mirror manner to form a longitudinal electric field mainly along the fiber polarization direction inside the driving region 202.

[0036] The piezoelectric ceramic fibers within the sensing region 201 are polarized along the thickness direction, and the upper and lower electrodes corresponding to the sensing region 201 are transverse strip, ring, or island structures, enabling the sensing region 201 to operate at d 31 The mode is configured to respond in the thickness direction to the in-plane strain generated in the driving region 202 and to provide an electromechanical response to the stress wave propagating in the sensing region 201.

[0037] The sensing region 201 in this application is polarized along the thickness direction and is equipped with transverse strip, ring, or island-shaped upper and lower electrodes, so that electromechanical coupling is mainly generated along the thickness direction. The transverse electric field direction formed is approximately orthogonal to the fiber length direction, thereby generating a d-field in the sensing region 201 dominated by transverse strain. 31 The mode electromechanical response is improved, and the sensitivity to guided wave signals is enhanced.

[0038] When the device is operating, the sensing region 201 can generate two types of thickness-direction electromechanical responses of different frequency bands on the same piezoelectric fiber composite material layer 106: one type is a low-frequency thickness-direction electromechanical response caused by the in-plane deformation of the driving region 202 in the sensing region 201, which can be used as a feedback signal for drive hysteresis compensation and closed-loop control; the other type is a fast electromechanical response generated by the mid-to-high frequency stress waves propagating in the structure in the sensing region 201, thus enabling the sensing region 201 to simultaneously cover low-frequency in-plane deformation feedback and high-frequency guided wave sensing, which can be used for the acquisition of guided wave propagation characteristics. By using different polarization methods, the electromechanical coupling direction of the sensing region 201 is distinguished from that of the driving region 202.

[0039] In a specific application example, the length of the sensing area 201 The length of the drive region 202 The ratio satisfies: .

[0040] The center distance between the driving area 202 and the sensing area 201 satisfy: And the center distance Simultaneously, it meets the electrical insulation distance requirements under the maximum design drive voltage applied to the drive region 202. Among these, The wavelength of the flexible piezoelectric fiber composite material sensing and driving device at a preset detection frequency.

[0041] Specifically, this application controls the center distance between the driving region 202 and the sensing region 201 to meet the arrangement requirements for guided wave excitation and reception, as well as the insulation spacing requirements under high driving voltage. This center distance can be designed according to the target guided wave frequency and structural propagation characteristics, enabling the flexible piezoelectric fiber composite material sensing-driven co-operation device to simultaneously undertake guided wave excitation and reception functions, realizing damage detection, damage location, and path-related signal identification.

[0042] like Figure 3 As shown, the piezoelectric fiber composite material layer 106 includes piezoelectric ceramic fibers 301 and a polymer matrix 302. The piezoelectric ceramic fibers 301 and the polymer matrix 302 are arranged alternately in sequence.

[0043] To improve the potential boundary changes at the interdigital electrode endpoints, the surface of the driving region 202 is provided with grooves 303 corresponding to the interdigital regions of the interdigital electrodes. The extension direction of the grooves 303 is perpendicular to the elongation direction of the piezoelectric ceramic fibers 301. The grooves 303 are filled with conductive material, forming a heterogeneous electrode structure of "electrode-filler-piezoelectric ceramic fiber". This structure changes the boundary conditions of the traditional interdigital electrode endpoints, enabling a smooth transition of potential and dielectric continuity in the lateral direction, reducing local high field peaks generated by the electrode endpoints, making the electric field distribution within the fiber more balanced, increasing the proportion of more fibers participating in electromechanical coupling, thereby improving the electromechanical conversion quality of the drive output, making the electric field and acoustic boundaries at the electrode ends smoother, and reducing local field strength abrupt changes and internal stress wave scattering. The conductive material is a conductive polymer or a conductive composite material.

[0044] Specifically, the extension direction of the groove 303 is perpendicular to the elongation direction of the piezoelectric ceramic fiber 301 and corresponds to the interdigital region of the upper and lower interdigital electrodes in the driving region 202, thereby forming a repeating array of grooves along the electrode array direction. The position of the groove array corresponds to the high-field region at the end of the interdigital electrode. In this application, the groove 303 is only provided on the surface of the piezoelectric fiber composite material layer 106 in the driving region 202, and the groove 303 is not provided in the sensing region 201, so as to maintain the linearity of the strain response and signal integrity of the sensing region 201.

[0045] The conductive material filled in the groove 303 together with the upper and lower copper electrodes constitutes the heterogeneous electrode structure of the driving region 202. This structure reduces the local electric field peak at the electrode end and improves the uniformity of the electric field distribution inside the piezoelectric fiber without reducing the effective electric field strength in the driving direction. At the same time, it reduces the scattering and false reflection of high-frequency guided waves inside the driving region 202, thereby suppressing high-frequency interference to the sensing region 201.

[0046] In this application, the electromechanical coupling between the driving region 202 and the sensing region 201 is determined by the polarization direction, electrode configuration, slot structure and equivalent stiffness within the region, which causes the device to form a spatial variation in electromechanical coupling strength along the length direction, thereby realizing the physical separation of the driving mode and sensing mode within a single device.

[0047] The depth of the groove 303 With respect to the thickness of the piezoelectric fiber composite material layer 106 satisfy: The width of the groove 303 With slot pitch satisfy: .

[0048] The equivalent bending stiffness caused by the groove 303 in the driving region 202 Bending stiffness of the ungrooved portion The ratio satisfies: This is to maintain the overall stiffness continuity of the drive region 202 along its length and to avoid secondary scattering of high-frequency guided waves.

[0049] The elastic modulus of the conductive material satisfy: ;in, The elastic modulus of the polymer matrix 302 is given. The equivalent elastic modulus of the piezoelectric fiber composite layer 106 is given. The modulus of piezoelectric ceramic fiber 301 is given.

[0050] Specifically, in this application, the groove 303 is filled with a conductive polymer or conductive composite material, forming a multiphase interface of "copper electrode - conductive filler - ceramic fiber" in the lateral direction of the electrode structure. This structure allows for a smoother transition of the potential distribution at the electrode end, reducing the local electric field gradient generated at the electrode endpoint. Simultaneously, the elastic and acoustic parameters of the filling material are between those of the piezoelectric ceramic fiber 301 and the polymer matrix 302. The heterogeneous electrode structure also exhibits a relatively continuous interface at the mechanical and acoustic boundaries, reducing the scattering of high-frequency stress waves by the groove interface of the driving region 202, improving the material continuity of the groove interface, and thus helping to weaken the scattering of high-frequency stress waves by the interface and reduce the structural interference of the driving region 202 on high-frequency guided wave sensing.

[0051] like Figure 4 As shown, the flexible piezoelectric fiber composite sensing-driven co-driving device provided in this application is adhered to the surface of a cantilever beam. A signal generator 401 generates a bias sine wave with a frequency of 2Hz and an amplitude of -2V to 6V. After passing through a high-voltage amplifier 402, the voltage signal is amplified 200 times, i.e., -400V to 1200V, and output to the driving area of ​​the flexible piezoelectric fiber composite sensing-driven co-driving device 403. The signal from the sensing area is connected to a charge amplifier 405, which converts the charge signal of the sensing area 201 into the required voltage signal. The signal from the charge amplifier 405 is compared with the signal from the laser displacement sensor 404 using a multi-channel oscilloscope 406 to determine the accuracy of the sensing signal during the driving process. Figure 5 As shown, the flexible piezoelectric fiber composite material sensing-driven collaborative device provided in this application can sense the structural state in real time during the driving process. Channel 1 is the device sensing signal, and channel 2 is the laser displacement sensor signal. The two are almost identical in frequency and curve shape, which verifies the sensing-driven collaborative capability of the flexible piezoelectric fiber composite material sensing-driven collaborative device provided in this application. It can sense the real state of the structure in real time during the driving process.

[0052] This application constructs two independent electromechanical coupling regions, a driving region 202 and a sensing region 201, on the same piezoelectric fiber composite material layer 106. By comprehensively employing differences in polarization direction, electrode configuration, slot array structure, and heterogeneous electrode structure, the driving region 202 and the sensing region 201 are physically distinguished in terms of electromechanical coupling path, dominant frequency band, and acoustic boundary. This enables the device to achieve physical separation of in-plane driving and thickness direction sensing in a monolithic structure, and constructs a dual-band sensing capability in a monolithic device that combines low-frequency feedback and high-frequency guided wave detection. This meets the dual requirements of high-precision driving and high-frequency guided wave detection, and is suitable for precision deformation control, active vibration control, and structural health monitoring of thin-walled structures in aerospace, rail transportation, engineering machinery, wind power, and other fields.

[0053] Compared with traditional MFC, this application improves the electric field distribution and electromechanical coupling consistency inside the driving region 202 through slot array structure and heterogeneous electrodes, establishes independent sensing paths through partitioned polarization and partitioned electrode configuration, and obtains dual-band sensing capability through material and structural design. This enables the monolithic device to simultaneously possess in-plane driving, high-precision feedback and high-frequency guided wave detection functions, which can meet the needs of various applications such as high-precision control, structural health monitoring and non-destructive testing.

[0054] This application is applicable to vibration regulation, closed-loop control, guided wave excitation and reception, and other similar applications. This application is not limited to the above embodiments; any equivalent substitutions of materials, dimensions, electrode shapes, polarization methods, and slot parameters made without departing from the inventive concept are within the scope of protection of this application.

[0055] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A flexible piezoelectric fiber composite material sensing and driving co-operation device, characterized in that, The flexible piezoelectric fiber composite material sensing and driving co-operating device includes: a first encapsulation film, a second encapsulation film, and a piezoelectric fiber composite material layer; the piezoelectric fiber composite material layer is located between the first encapsulation film and the second encapsulation film. Both the first encapsulation film and the second encapsulation film are flexible circuit boards, and the first encapsulation film is provided with an upper electrode, and the second encapsulation film is provided with a lower electrode; The piezoelectric fiber composite material layer is divided into a driving region and a sensing region along its length; The piezoelectric ceramic fibers in the driving region are polarized along their length, and the upper and lower electrodes corresponding to the driving region are symmetrically arranged interdigitated electrodes along the polarization direction of the piezoelectric ceramic fibers, so that the driving region operates at d 33 The pattern is designed to induce in-plane strain. The piezoelectric ceramic fibers within the sensing region are polarized along the thickness direction, and the upper and lower electrodes corresponding to the sensing region have transverse strip, ring, or island structures, enabling the sensing region to operate at d 31 The mode is configured to respond in the thickness direction to in-plane strain generated in the driving region and to provide an electromechanical response to stress waves propagating in the sensing region.

2. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 1, characterized in that, The flexible piezoelectric fiber composite material sensor-driven co-drive device further includes an adhesive layer; the adhesive layer is located between the first encapsulation film and the piezoelectric fiber composite material layer and between the second encapsulation film and the piezoelectric fiber composite material layer.

3. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 1, characterized in that, The length of the sensing area With the length of the driving region The ratio satisfies: .

4. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 1, characterized in that, The center distance between the driving area and the sensing area satisfy: And the center distance Simultaneously, it meets the electrical insulation distance requirements under the maximum design drive voltage applied to the drive region; among which... The wavelength of the flexible piezoelectric fiber composite material sensing and driving device at a preset detection frequency.

5. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 1, characterized in that, The surface of the driving area is provided with grooves corresponding to the interdigital regions of the interdigitated electrodes. The extension direction of the grooves is perpendicular to the elongation direction of the piezoelectric ceramic fibers. The grooves are filled with conductive material to form a heterogeneous electrode structure of electrode-filler-piezoelectric ceramic fiber.

6. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 5, characterized in that, The depth of the groove With respect to the thickness of the piezoelectric fiber composite layer satisfy: The width of the groove With slot pitch satisfy: .

7. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 5, characterized in that, The equivalent bending stiffness caused by the groove portion in the driving area Bending stiffness of the ungrooved portion The ratio satisfies: .

8. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 5, characterized in that, The conductive material is a conductive polymer or a conductive composite material.

9. The flexible piezoelectric fiber composite material sensing and driving co-operating device according to claim 5, characterized in that, The piezoelectric fiber composite material layer includes piezoelectric ceramic fibers and a polymer matrix; the piezoelectric ceramic fibers and the polymer matrix are arranged alternately in sequence.

10. The flexible piezoelectric fiber composite material sensing and driving co-operation device according to claim 9, characterized in that, The elastic modulus of the conductive material satisfy: ;in, This represents the elastic modulus of the polymer matrix. The equivalent elastic modulus of the piezoelectric fiber composite layer. The modulus of piezoelectric ceramic fibers.

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