13 results about "Elastic wave propagation" patented technology

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.

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 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.

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.

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.

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.

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.

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.

The invention relates to an elastic wave device 10000 which comprises one or more variable impedance means 1003, 2003, 3003, 10400, in which each variable impedance means 1003, 2003, 3003, 10400 comprises a capacitor configured to change capacitance as a function of temperature variation to compensate for a frequency shift of an operating frequency of the elastic wave device caused by the temperature variation; 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, 11130;and a network 4000, 11150 of at least one electrode 1000, 2000, 3000 located between the first electromechanical device 3, 11130 and the second electromechanical device 5, 11140 in the direction of propagation of the elastic waves. Figure for the abbreviation: Figure 12;

This invention relates to a phonon crystal damping material plate, its preparation method, and its installation method, belonging to the field of damping material technology. The phonon crystal damping material plate provided by this invention includes a magnetic damping material plate and a phonon crystal pillar array. The phonon crystal pillars of the phonon crystal pillar array extend in the thickness direction of the magnetic damping material plate and penetrate two opposite surfaces of the magnetic damping material plate. By introducing a phonon crystal pillar structure, this invention enables the phonon crystal damping material plate to not only absorb vibration energy through the mass and elasticity of the damping material itself, but also utilize the bandgap effect of the phonon crystal pillars on elastic wave propagation, thereby increasing the absorption effect of the phonon crystal damping material plate on low-frequency vibrations and greatly improving the low-frequency damping performance of the material. This invention uses a magnetic damping material plate, allowing the phonon crystal damping material plate to be installed by magnetic adsorption, eliminating the need for mechanical connections or adhesive bonding, facilitating installation, maintenance, and replacement.

An elastic wave device comprising: a variable impedance means; a first electromechanical device, in particular, a first transducer, and a second electromechanical device, in particular, a second transducer or an electrode array configured to reflect at least partially elastic waves emitted by the first electromechanical device; an array of at least one electrode located between the first electromechanical device and the second electromechanical device in the direction of propagation of the elastic waves, in which at least one electrode of the array of at least one electrode is connected to an electrical potential via the variable impedance means; the array forming a cavity; a frequency adjustment means configured to adjust the resonant frequency of the cavity; a control means configured to control the variable impedance means. (FIG. 11).

The invention relates to an elastic wave device 10000 that comprises one or more variable impedance means 1003, 2003, 3003, 10400, wherein each variable impedance means 1003, 2003, 3003, 10400 comprises a capacitor configured to change capacity depending on temperature variation to compensate for a frequency shift of an operating frequency of the elastic wave device caused by the temperature variation; 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, 11130; and an array 4000, 11150 of at least one electrode 1000, 2000, 3000 located between the first electromechanical device 3, 11130 and the second electromechanical device 5, 11140 in the direction of propagation of the elastic waves.