46 results about "Elastic wave propagation" patented technology

The invention relates to the technical field of earthquake monitoring, and discloses a comprehensive earthquake prediction method, which comprises the following steps of: acquiring a continuous micro-motion data sequence to reconstruct an empirical green function sequence, and dividing the empirical green function sequence into a compression phase subset and a stretching phase subset by utilizing a synchronously acquired theoretical earth tide stress phase; respectively extracting a causal branch waveform corresponding to the positive time axis and a non-causal branch waveform corresponding to the negative time axis, and determining a weight index for inhibiting the non-structural interference by calculating a reciprocity residual error between a causal wave velocity offset and a non-causal wave velocity offset; correcting a wave velocity offset mean value by using the weight index to obtain a stress sensitivity coefficient reflecting the stress state of the earth crust medium; according to the method, a physical criterion is established by using an elastic wave propagation reciprocity principle, decoupling of medium attribute change and noise source spatial drift is realized, and visual wave velocity offset induced by environmental interference is eliminated.

This invention discloses a method for calculating the vibration response of a delaminated composite laminate, belonging to the field of structural defect calculation and analysis. The method includes: dividing the composite laminate with delamination defects into delaminated and intact regions based on the damage condition; decoupling the delaminated regions dynamically; describing the vibration characteristics of each component in both the delaminated and intact regions using elastic waves based on elastic wave propagation theory, and establishing vibration state vector expressions for each region; determining the compatibility relationship based on the displacement continuity and internal force equilibrium conditions at the coupling point between the delaminated and intact regions, and establishing structural dynamic equilibrium equations in wave space based on the boundary conditions of the composite laminate; solving the structural dynamic equilibrium equations to obtain the amplitudes of elastic waves of each order; and calculating the vibration response of each region of the composite laminate based on elastic wave theory and amplitude calculation. This invention solves the problem of low computational efficiency in existing methods.

The invention relates to a dynamic compaction construction intelligent monitoring and self-adaptive control method based on a physical information neural network, and the method comprises the steps: arranging a vibration sensor array in a construction safety region, collecting a compaction vibration signal in real time, and extracting time domain, frequency domain and spatial propagation characteristics; constructing a physical information neural network model, taking a soil elastic wave propagation equation as a physical constraint, taking vibration characteristics and monitoring point space coordinates as input, and predicting three-dimensional distribution of soil physical property parameters; based on the predicted soil body parameters, calculating the distribution and development trend of the bearing capacity of the foundation by adopting a Taisha foundation bearing capacity theory; a multi-target optimization model with the bearing capacity reaching the standard, the minimum energy consumption and the shortest time as targets is established, and follow-up tamping parameters are optimized; and construction is executed according to the optimized parameters, and data and model parameters are continuously updated. Compared with the prior art, the problems that in traditional dynamic compaction construction, the soil body state cannot be observed, and optimization lacks theoretical support are solved, and intelligentization and accurate control over the construction process are achieved.

The scheme belongs to the technical field of structural mechanics, and discloses a metamaterial rod outputting only tensile waves and application thereof.The metamaterial rod comprises an even number of guide rods arranged symmetrically and a plurality of cells linearly arranged on the guide rods, each cell comprising a first connecting plate, a second connecting plate, a first inclined rod, a second inclined rod, a third inclined rod, a fourth inclined rod and a spring, and the stiffness of the first cell is smaller than that of the other cells.By utilizing external friction, the momentum conservation of the system is broken, and through in-depth analysis of the propagation mechanism of elastic waves, the metamaterial rod with uneven distribution is ingeniously designed, and the cells are unevenly arranged, so as to realize the unusual function of outputting only tensile waves.No matter whether an impact, a sudden stretching, a stretching or an alternating repeated load of stretching and compression is applied to one end of the rod, only the tensile signal is output at the other end of the rod, and the transmission of the tensile wave also exhibits the characteristics of a solitary wave, and the original wave shape and amplitude are maintained during the propagation process.

This invention discloses a method for calculating the vibration response of a delaminated composite laminate, belonging to the field of structural defect calculation and analysis. The method includes: dividing the composite laminate with delamination defects into delaminated and intact regions based on the damage condition; decoupling the delaminated regions dynamically; describing the vibration characteristics of each component in both the delaminated and intact regions using elastic waves based on elastic wave propagation theory, and establishing vibration state vector expressions for each region; determining the compatibility relationship based on the displacement continuity and internal force equilibrium conditions at the coupling point between the delaminated and intact regions, and establishing structural dynamic equilibrium equations in wave space based on the boundary conditions of the composite laminate; solving the structural dynamic equilibrium equations to obtain the amplitudes of elastic waves of each order; and calculating the vibration response of each region of the composite laminate based on elastic wave theory and amplitude calculation. This invention solves the problem of low computational efficiency in existing methods.

Provided is an elastic wave device in which degradation in Q characteristics is less likely to occur. An elastic wave device (1) includes a piezoelectric substrate (2) and an IDT electrode (7) provided on the piezoelectric substrate (2), the IDT electrode (7) having an overlapping region in which a first electrode finger and a second electrode finger overlap along an elastic wave propagation direction, the overlapping region having a central region and first and second low sound velocity regions on both outer sides of the central region in the extension direction of the first and second electrode fingers, the first and second bus bars (11, 12) having a plurality of openings (11a, 12a), an inner bus bar portion (11b, 12b) on one side of the opening (11a, 12a) being connected to an outer bus bar portion (11c, 12c) on the other side through a plurality of connecting portions (11d, 12d), at least one of the plurality of connecting portions (11d, 12d) being a wide connecting portion (11d1, 12d1) having a width greater than the remaining connecting portions (11d, 12d).

The invention relates to an elastic wave device 10000 in the field of elastic wave-based components for areas such as telecommunication. The elastic wave device 1000 of the invention comprises a variable impedance means 1003, 2003, 3003, 10400, a first electromechanical device 3, 11130, in particular, a first transducer 3, 11130, and a second electromechanical device 5, 11140, in particular, a second transducer 5, 11140 or an electrode array configured to reflect at least partially elastic waves emitted by the first electromechanical device 3, an array 4000, 11150 of at least one electrode 1000, 2000, 3000 located between the first electromechanical device 3 and the second electromechanical device 5 in the direction of propagation of the elastic waves, and a temperature determination means 10200 configured to determine a temperature of an operating region of the elastic wave device.

The invention discloses an elastic wave device and an elastic wave device. The elastic wave device comprises a piezoelectric substrate and an electroacoustic transducer arranged above the piezoelectric substrate, the electroacoustic transducer comprises an IDT electrode and reflector electrodes arranged on the two sides of the IDT electrode. The IDT electrode comprises a plurality of first electrode fingers and a plurality of second electrode fingers which are arranged in parallel in a staggered mode, and a first bus bar and a second bus bar which are perpendicular to the extension direction of the first electrode fingers and the extension direction of the second electrode fingers and are arranged in parallel. The reflector electrode is provided with a fourth electrode finger; the length of the fourth electrode finger is set as beta, the length of the first electrode finger or the second electrode finger is set as alpha, and beta is larger than or equal to 5 alpha; the overlap length of the projection of the fourth electrode finger in the elastic wave propagation direction is alpha. The fourth electrode finger structure is arranged in the reflector, so that the pattern formed by the fourth electrode finger and the bus bar does not form a closed cavity, and the problems of difficulty in stripping and reliability caused by a closed gap in a traditional reflector are avoided.

Provided is an elastic wave device that is less likely to be surge-breakdown. A dielectric film (4) is provided so as to cover an IDT electrode (3) having: a first edge region (E1), a second edge region (E2), which are low sound velocity regions; and a first high sound velocity region (H1), a second high sound velocity region (H2), which are provided further outward than a crossing width region adjacent to a first electrode finger (13) and a second electrode finger (14) in an elastic wave propagation direction, and the thickness of the dielectric film (4) on the first edge region (E1), the second edge region (E2) is set to be thicker than the thickness of the dielectric film (4) on the first high sound velocity region (H1), the second high sound velocity region (H2).

This invention discloses a design and manufacturing method for a uniform cross-section explosive load simulator based on gradient elastic metamaterials, relating to the field of impact loading. Addressing the problems of high cost per use and the susceptibility of variable cross-section elastic rods to local buckling instability under high-speed impact leading to waveform distortion in existing simulators, this invention, while maintaining the macroscopic uniform cross-section shape of the simulator, derives the ideal wave impedance gradient required to achieve the target explosive load based on the one-dimensional elastic wave propagation inverse design theory; establishes the mapping relationship between the relative density of a three-period minimal surface (TPMS) metamaterial unit cell and its equivalent mechanical parameters, and inversely solves the spatial relative density distribution function; extracts the waveform through dynamic impact finite element simulation, and introduces an impedance gradient correction factor to perform nonlinear iterative correction of the density function, obtaining a final three-dimensional metamaterial geometric model that accurately matches the waveform, and uses a flexible polymer material for additive manufacturing. This invention achieves the purely elastic, non-destructive, and reusable simulator, perfectly adapting to the stable firing of light gas cannons, and exhibiting excellent anti-instability capability and waveform fidelity under strong dynamic loads.

Provided is an elastic wave device that can suppress an IMD and can suppress deterioration of reception sensitivity. An elastic wave device (1) includes a piezoelectric substrate (2), a first IDT electrode (3), reflectors (4A, 4B) provided on both sides of the first IDT electrode (3) in an elastic wave propagation direction, and a second IDT electrode (5) provided so as to sandwich the reflector (4A) and oppose the first IDT electrode (3) and constitute a second IDT (5A). The first and second IDT electrodes (3, 5) have a plurality of electrode fingers that overlap each other in the first and second intersection regions (A, B) in the elastic wave propagation direction. The first and second intersection regions (A, B) overlap each other in the elastic wave propagation direction. A third bus bar (16) of the second IDT electrode (5) is connected to a first bus bar (12) of the first IDT electrode (3), and a fourth bus bar (17) of the second IDT electrode (5) is connected to a ground potential. A resonance frequency of a portion including the second IDT electrode (5) is included in a frequency band of an interference wave signal.

Provided is an elastic wave device with low loss. In an elastic wave device (1), an IDT electrode (6) and a reflector electrode (7, 8) are provided on a piezoelectric substrate (2), an area in which first electrode fingers (6c) and second electrode fingers (6d) of the IDT electrode (6) overlap in an elastic wave propagation direction is a crossover area (K), the crossover area (K) has a central area (C), and first edge areas (E1) and second edge areas (E2) on both sides of the central area (C), and a dielectric film (9, 10) is arranged to pass through the reflector electrode (7, 8) from the first edge areas (E1) and the second edge areas (E2) to an area outside the elastic wave propagation direction of the reflector electrode (7, 8).

The application relates to the technical field of building health monitoring, and discloses a building health state monitoring method based on vibration signals. The method collects vibration data of different monitoring points of a building, and obtains external influence data such as meteorological data, traffic data, underground water level data, construction activity data and earthquake activity data; after uniform time calibration and preprocessing of the above data, natural frequency, vibration energy, cepstrum, three-dimensional vibration trajectory, ground reflection wave, elastic wave propagation and external influence characteristics are extracted; the extracted characteristics are input into a building evaluation model to obtain health state evaluation results including a health index, an abnormal type and a risk level; further combined with evaluation results and spatial position relationships of buildings in a target region, a group abnormal linkage relationship is identified, regional synchronous abnormality, single-body abnormality or conduction abnormality is determined, and regional safety evaluation results and risk early warning information are generated. The method improves the accuracy and early warning timeliness of building and building group health monitoring.

This elastic wave device comprises a substrate including an end surface and having a piezoelectric body, and a plurality of strip electrodes located above the substrate and each extending in parallel to each other, wherein: at least a portion of the plurality of strip electrodes is an excitation part capable of exciting an elastic wave; the end surface is parallel to the extending direction of the strip electrodes in plan view and is located in an elastic wave propagation direction with respect to the excitation part; the plurality of strip electrodes includes a first strip electrode located closest to the end surface side in the elastic wave propagation direction and a second strip electrode farther from the end surface than the first strip electrode in the elastic wave propagation direction; the second strip electrode is the excitation part; and the average thickness of the first strip electrode in a cross section cut in the elastic wave propagation direction is less than the average thickness of the second strip electrode.

A filter device capable of realizing an increase in the amount of attenuation outside a passband. A filter device (1) has a filter circuit (3) with a plurality of series arm resonators (S1-S4) connected between a first terminal (2a) and a second terminal (2b), the series arm resonators (S1-S4) having at least two series arm resonators (S1, S3) with different anti-resonance frequencies from each other, and an additional circuit (4) connected in parallel with the filter circuit (3) between the first terminal (2a) and the second terminal (2b), the additional circuit (4) having at least three IDT electrodes (5-8) arranged along an elastic wave propagation direction, the at least three IDT electrodes (5-8) having an IDT electrode (7) connected to the filter circuit (3) on the first terminal (2a) side and IDT electrodes (5, 6, 8) connected to the filter circuit (3) on the second terminal (2b) side, the IDT electrode (7) being connected to a first node (N1) which is one end of the series arm resonator (S3) having the lowest anti-resonance frequency, the IDT electrode (5) being connected to a second node (N2) which is one end of the series arm resonators (S1, S2) other than the series arm resonator (S3) and different from the first node (N1), and the IDT electrode (8) being connected to a third node.

A multiplexer (1) is provided with a first filter (10) and a second filter (50) having a passband on a lower frequency side than the passband of the first filter (10). The longitudinal coupling elastic wave resonator (13) of the first filter (10) has an IDT electrode group (30) including a plurality of IDT electrodes (31 to 37). The IDT electrode group (30) has an asymmetric shape with reference to a center line (CL) passing through the center (Cl) of the IDT electrode group (30) and orthogonal to the elastic wave propagation direction (D1). From the longitudinal coupling elastic wave resonator (13), the IDT electrodes (32, 34, 36) connected to the first path (rl) on the side of the common terminal (Tc) have a total average of electrode finger spacings (pt) smaller and a total of electrode finger numbers (pn) fewer than the IDT electrodes (31, 33, 35, 37) connected to the first path (rl) on the side of the first terminal (Tl).

The present invention provides an elastic wave device capable of suppressing transverse modes and high-order modes. The elastic wave device (1) of the present invention comprises a piezoelectric substrate (2) and an IDT electrode (7). The IDT electrode (7) comprises a central region (C) and a first edge region (E1) and a second edge region (E2). The regions including the first edge region (E1) and the second edge region (E2) and overlapping with the regions in the direction of propagation of the elastic wave are the first extended edge region (Ex1) and the second extended edge region (Ex2). The first extended edge region (Ex1) and the second extended edge region (Ex2) are provided with a first sound velocity adjustment portion (L) and a second sound velocity adjustment portion (M) having a lower sound velocity than the central region (C). The first sound velocity adjustment portion (L) comprises a first end portion (La) and a second end portion (Lb), and the second sound velocity adjustment portion (M) comprises a third end portion (Ma) and a fourth end portion (Mb). The first end portion (La) to the fourth end portion (Mb) are located outside the first edge region (E1) and the second edge region (E2). At least one of the two sets of ends, the first end portion (La) and the third end portion (Ma) and the second end portion (Lb) and the fourth end portion (Mb), do not overlap in the direction in which the plurality of electrode fingers extend.

The invention provides a neural network training method, a model construction method, devices, equipment and a medium, when a two-phase medium fluctuation feature learning network is trained, reservoir physical property parameters are used as input, a plurality of prediction wave equation coefficients of a sample two-phase pore medium elastic wave propagation model are predicted, and the two-phase medium fluctuation feature learning network is trained by combining a physical constraint mechanism based on plane wave analysis. According to error loss between predicted frequency dispersion attenuation characteristics and real frequency dispersion attenuation characteristics of a sample biphase pore medium elastic wave propagation model, parameters of a biphase medium fluctuation characteristic learning network are adjusted, and the network is made to have higher prediction stability and physical consistency through back propagation; the prediction wave equation coefficient output by the two-phase medium fluctuation feature learning network is ensured, and meanwhile, the data precision and physical consistency requirements are considered, so that the physical consistency, the expression accuracy and the generalization ability of the constructed target two-phase pore medium elastic wave propagation model are improved.

An elastic wave device includes a substrate having an end surface and including a piezoelectric body, and strip electrodes located above the substrate, each of the strip electrodes extending in parallel. Some of the strip electrodes are excitation portions that can excite an elastic wave, the end surface is parallel to the direction the strip electrodes extend, and located in an elastic wave propagation direction. The plurality electrodes include a first strip electrode located closest to the end surface in the elastic wave propagation direction, and a second strip electrode farther from the end surface than the first strip electrode in the elastic wave propagation direction, the second strip electrode is the excitation portion, and an average thickness of the first strip electrode is smaller than an average thickness of the second strip electrode, in a cross section cut in the elastic wave propagation direction.

There is a need to reduce spurious emissions from elastic wave equipment. [Solution] The elastic wave device includes a substrate having a piezoelectric material and an end face, and a plurality of strip electrodes located above the substrate and each extending in parallel, wherein at least some of the plurality of strip electrodes are excitation sections capable of exciting elastic waves, the end face is parallel to the direction in which the strip electrodes extend when viewed from above in plan view, and is located in the elastic wave propagation direction relative to the excitation section, the plurality of strip electrodes include a first strip electrode located closest to the end face in the elastic wave propagation direction, and a second strip electrode which is further from the end face than the first strip electrode in the elastic wave propagation direction and is the excitation section, in a cross section cut in the elastic wave propagation direction, the average thickness of the first strip electrode is smaller than the average thickness of the second strip electrode, the substrate has a groove on its upper surface, and the end face is part of the side surface of the groove.

The present invention provides an elastic wave device that suppresses transverse modes and reduces energy leakage of elastic waves. [Solution] The elastic wave apparatus comprises a piezoelectric substrate including a piezoelectric layer and an IDT electrode 9 having a plurality of first floating electrodes 11. The intersection region A has a central region F located on the central side in the propagation orthogonal direction perpendicular to the elastic wave propagation direction, and a first edge region H1 and a second edge region H2 facing each other with the central region F in between. The plurality of first floating electrodes 11 are located between the first edge region H1 and the first bus bar 13. The region located between the first edge region H1 and the first bus bar 13, where the plurality of first floating electrodes 11 are provided, is the first floating electrode formation region U1. The elastic wave apparatus further comprises a first mass addition film 8A provided in the first edge region H1 and a second mass addition film 8B provided in the first floating electrode formation region U1.

The invention relates to the technical field of optical imaging, in particular to an endoscopic imaging device based on a forward probe, a medical host system and an imaging method.The endoscopic imaging device comprises a forward scanning probe, an in-vitro system, an excitation unit and a signal processing unit, receiving an optical signal carrying tissue scattering information; the in-vitro system is used for realizing light interference, converting an interference light signal into digital OCT original data, outputting a synchronous trigger signal to the excitation unit, collecting an OCT scattering signal in an elastic wave propagation process, converting the OCT scattering signal into an OCT complex value signal, and packaging the OCT complex value signal into an original data stream; and the signal processing unit performs phase extraction, displacement calculation or wave velocity estimation and the like on the original data stream, performs elastic inversion, and outputs tissue elastic information in all directions, so that the problems of limited imaging view field, insufficient lesion recognition sensitivity, limited clinical application, elastic quantitative measurement and the like in related technologies are solved, and the accuracy and the reliability of the system are improved. And the accuracy and the sensitivity of early lesion diagnosis are improved.

Provided is an elastic wave device in which response caused by Rayleigh waves is suppressed. An elastic wave device (1) includes: an IDT electrode (5) provided on a piezoelectric substrate; and reflector electrodes (6, 7) disposed on both sides of the elastic wave propagation direction of the IDT electrode (5) and having a plurality of electrode fingers (6a or 7a) disposed at intervals, and further includes: dielectric films (10, 11) disposed between the reflector electrodes (6, 7) and the piezoelectric substrate in regions in which the plurality of electrode fingers (6a, 7a) of the reflector electrodes (6, 7) and the intervals are provided.

The invention relates to a 10000 elastic wave device in the field of elastic wave-based components for fields such as telecommunications. The elastic wave device 1000 of the invention comprises a variable impedance means 1003, 2003, 3003, 10400, a first electromechanical device 3, 11130, in particular a first transducer 3, 11130, and a second electromechanical device 5, 11140, in particular a second transducer 5, 11140 or an electrode array configured to reflect at least partially elastic waves emitted by the first electromechanical device 3, an array 4000, 11150 of at least one electrode 1000, 2000, 3000 located between the first electromechanical device 3 and the second electromechanical device 5 in the direction of propagation of the elastic waves, and a temperature determination means 10200 configured to determine a temperature of an operating region of the wave device elastic bands.Figure for the abbreviation: Figure 12.

Provided is an elastic wave device having low loss due to resistance. This elastic wave device is provided with a plurality of resonators, a pad, and a plurality of wirings provided on a piezoelectric substrate. Each of the plurality of resonators has an IDT electrode, and the wiring is provided with a bus bar adjacent portion extending from the bus bar in a direction orthogonal to an elastic wave propagation direction of the IDT electrode. The bus bar adjacent portion has, in the elastic wave propagation direction, a connection-side end portion that is close to a portion connected to a pad or another resonator, and a non-connection-side end portion that is located on the opposite side of the pad or another resonator. The width of the connection-side end portion in the orthogonal direction is larger than the width of the non-connection-side end portion of the bus bar in the orthogonal direction, and the width of the bus bar adjacent portion in the wiring in the orthogonal direction in the elastic wave propagation direction is configured so as to gradually widen from the non-connection-side end portion of the bus bar toward the connection-side end portion.

The invention relates to the technical field of semiconductors, and discloses a cascade resonator, an elastic wave filter and a multiplexer. The cascaded resonator comprises a piezoelectric substrate and a conductive film pattern arranged on the piezoelectric substrate, the conductive film pattern comprises a first confluence area, a second confluence area, an interdigital area and a false finger area, the length of an electrode finger of the interdigital area gradually changes along with the propagation direction of elastic waves, so that the edge of the interdigital area is in a broken line shape or a curved line shape, and the thickness of the false finger area is smaller than that of the first confluence area. The edge shape of the second confluence area is the same as the edge shape of the interdigital area or the mirror image is the same. According to the cascade resonator, one elastic wave resonator can be split into two or even multiple resonators for cascade connection by arranging the second confluence region, and the edge shape of the second confluence region is optimized to be the same as the edge shape or mirror image of the interdigital region, so that a good transverse mode suppression function is achieved, and the resonance effect is improved. Therefore, the performance of an elastic wave filter and a multiplexer based on the cascade resonator is ensured, and the miniaturization development of devices is promoted.

The invention discloses a composite vibration isolation device with wave impedance and photonic crystals and a working method of the composite vibration isolation device, and belongs to the technical field of vibration and noise reduction of spaceflight and navigation equipment. Comprising a plurality of wave impedance conversion modules which are arranged at the lowermost part of the device, form space change of equivalent impedance through segmented geometric parameters and material configuration and are used for reflecting and suppressing input vibration at a low-frequency band; the connection module is used for connecting the wave impedance conversion module and the photonic crystal module; the phononic crystal module is mounted at the upper end of the connecting module, is provided with a local resonance band gap structure and is used for blocking elastic wave propagation in middle and high frequency bands; and the bearing module is arranged at the upper end of the phononic crystal module and is used for carrying a device. Through the composite design of the wave impedance conversion module and the photonic crystal module, the problems of limited low-frequency suppression capability and obvious medium-high frequency band gap external transmission existing in a single technical scheme are cooperatively solved, and continuous broadband vibration isolation from low frequency to medium-high frequency is realized.

The application discloses a pipeline vibration isolation support hanger with a band gap characteristic, and belongs to the technical field of marine damping components, which is composed of an L-shaped flange, a connecting flange, a rubber gasket, a damper, a horse leg, a phononic crystal and a pipeline flow channel, and the components are connected by bolts, gaps are arranged between the flanges, and the rubber gasket is arranged between the connecting flange and the L-shaped flange. The damper is used for buffering pipeline vibration, the band gap characteristic of the phononic crystal is used for preventing low-frequency elastic wave propagation, and low-frequency vibration absorption is realized. The application has the advantages of compact structure, convenient assembly and disassembly, support and vibration reduction and noise reduction functions, can meet the safety and reliability requirements of ship equipment, effectively improves the low-frequency vibration reduction and noise reduction performance of the ship pipeline system, and provides a new selection for selection of related damping components.

Provided is an elastic wave device capable of effectively suppressing a transverse mode. An elastic wave device (1) of the present invention includes a piezoelectric substrate (2) and an IDT electrode (3A to 3C). The IDT electrode (3A to 3C) includes a first pitch portion (E) in which electrode fingers have a relatively wide pitch and a second pitch portion (F) in which electrode fingers have a relatively narrow pitch. A central region (B) is located on a central side in a direction in which the electrode fingers extend, and a first edge region (Ca) and a second edge region (Cb) are located on both sides of the central region (B). A plurality of mass addition films is provided in the first edge region (Ca) and the second edge region (Cb). The plurality of mass addition films includes a plurality of first mass addition films (9a) provided in the first pitch portion (E) and a plurality of second mass addition films (9b) provided in the second pitch portion (F). The length of the first mass addition films (9a) in an elastic wave propagation direction is longer than the length of the second mass addition films (9b) in the elastic wave propagation direction.

The present application relates to the technical field of geophysical exploration, and discloses a resolution adjustment method of a controllable impact seismic source, comprising: obtaining the longitudinal wave velocity of a target layer of an area to be imaged and inversely calculating the target characteristic period of a seismic source output wavelet; according to the preset maximum stroke limit of a gun barrel and the elastic modulus characteristics of the surface medium, using one-dimensional elastic wave propagation theory and a double-path optimization strategy, and taking matching the target characteristic period as the target, jointly optimizing the material type and physical length of the impact bullet to obtain optimal impact bullet parameters; using the parameters for field excitation, extracting the measured characteristic period and comparing it with the target value, and under the premise of unchanged material, adjusting the physical length of the bullet to perform closed-loop correction. The present application solves the problems of fixed main frequency and impedance mismatch of the traditional seismic source, can automatically balance the resolution and waveform quality under the limited stroke, realizes quantitative regulation and control of wideband output, improves the energy coupling efficiency, and effectively supports multi-resolution step-by-step inversion imaging.