884 results about "Low frequency vibration" patented technology

The invention provides an unmanned aerial vehicle multi-dimensional information fusion method and system based on acousto-optic-electric composite detection. According to the method, acoustic frequency band signals, visible light image sequences and electromagnetic field intensity change data are collected, acoustic characteristic flow, optical characteristic flow and electrical characteristic flow are generated, and based on the time deviation between a low-frequency vibration mode and transient electromagnetic pulses, multi-channel dynamic calibration is carried out on an image distortion area in the optical characteristic flow. The method comprises the following steps: acquiring an acoustic feature flow, an optical feature flow and an electrical feature flow, correcting space-time coordinate parameters of the acoustic feature flow, the optical feature flow and the electrical feature flow, generating a calibration feature flow, carrying out anti-interference fusion processing on the calibration feature flow, extracting multi-dimensional coupling features, inputting the multi-dimensional coupling features into an unmanned aerial vehicle flight path planning model, and generating a three-dimensional space situation model; according to the invention, the physical space-time consistency alignment and noise suppression of the multi-modal data are realized, and the obstacle positioning precision and the dynamic trajectory prediction real-time performance are significantly improved.

The invention belongs to the technical field of industrial automation control, and particularly relates to a dynamic optimization control method and system for multi-component batching of a paste making machine, and the method comprises the steps: generating a characteristic waveform spectrum corresponding to a residue molecular structure; dynamically generating electric lubricating medium parameters containing the electroosmotic liquid concentration and the release rate; triggering a low-frequency vibration module of the material layer to generate vibration waves, and enabling the solution and the vibration waves to form a molecular-level synergistic stripping effect; calculating a nanoparticle dispersity index, and generating an inverse gradient mixing instruction when the index exceeds a threshold value; activating a hot vortex ring in a spiral flow guide convex pattern area and establishing a directional heat energy migration channel; and verifying the dynamic equilibrium state of the temperature of the paste core area and the viscoelasticity of the target formula, and triggering a phase lock control signal to terminate the parameter adjustment chain when the energy consumption rate reaches a stable interval. According to the invention, the problems that the transition period during formula switching is prolonged and the phase differences among the execution mechanisms are difficult to match in real time due to a traditional staged regulation and control mode are solved.

The invention relates to the technical field of power equipment fault diagnosis, in particular to a pump station circuit breaker fault detection method and system, and the method comprises the following steps: S1, collecting a vibration signal lower than 50 Hz in the operation process of a circuit breaker; s2, preprocessing the vibration data acquired in the S1; s3, analyzing the vibration data preprocessed in the S2, and extracting characteristic parameters related to low-frequency vibration of the circuit breaker; forming a feature vector by the extracted feature parameters; s4, training the feature mode training set to generate a circuit breaker fault mode recognition model; and S5, converting the current vibration data into a real-time feature vector, inputting the real-time feature vector into the fault mode recognition model generated in the step S4, judging whether the circuit breaker is abnormal or not, and generating a fault diagnosis report. According to the method, high-precision real-time detection and reliable diagnosis of the circuit breaker fault are realized through precise extraction of the low-frequency vibration signal and feature vector construction in combination with the optimized support vector machine fault mode recognition model.

The invention relates to a low-frequency vibration isolator with a wide quasi-zero stiffness interval. The low-frequency vibration isolator comprises a bearing platform, a base, a first negative stiffness assembly, a second negative stiffness assembly and a linear vibration isolation assembly. The bearing platform and the base are arranged in parallel and are both provided with bolt holes and limiting holes; a linear vibration isolation assembly is installed between the bearing platform and the base. The first negative stiffness assemblies are symmetrically distributed with the center point connecting line of the bearing platform and the base as the symmetry axis. The top of the first negative stiffness assembly is connected with the bearing platform, and the bottom of the first negative stiffness assembly is connected with the base. The two ends of the second negative stiffness assembly are connected with the two first negative stiffness assemblies correspondingly. The low-frequency vibration isolator has the characteristics of high static rigidity and low dynamic rigidity, the contradiction between the bearing capacity and the vibration isolation performance of a linear vibration isolation system is effectively solved, and the effective low-frequency vibration isolation effect on a vibration-isolated object is achieved while the bearing capacity of the vibration isolator is guaranteed.

The invention relates to the technical field of vibration isolation control, discloses an air floating support quasi-zero stiffness active vibration reduction method based on model predictive control, and aims to solve the problems of high vibration isolation requirements of precision equipment in a low-frequency vibration environment, response lag of a traditional vibration isolation technology and insufficient control precision under uncertainty. The method comprises the following steps: step 1, carrying out system modeling on the vibration damping device to obtain a state space model of the vibration damping device, and introducing a Kalman filter into the state space model to predict state information in real time; step 2, constructing an optimization problem and a constraint condition of the MPC controller; step 3, carrying out robustness and stability analysis on the MPC controller; and step 4, fusing sensor data through the MPC controller after robustness analysis, solving an optimization problem through an optimization algorithm, calculating an optimal control input # imgabs0 # in real time, driving a voice coil motor, and suppressing low-frequency vibration.

The invention discloses an anti-carsickness semi-active seat band-stop filtering control method, which comprises the following steps of: firstly, establishing a two-degree-of-freedom model of a vehicle seat suspension system, and designing a seat suspension active control system to meet the following constraint conditions: the dynamic stroke of a seat suspension does not exceed the maximum allowable stroke; and the control force is smaller than the maximum output control force of the actuator. In order to effectively reduce the carsickness symptom caused by seat vibration, the invention also establishes a target function for inhibiting the vibration of the seat in a human body sensitive frequency range, designs a frequency weighted sliding mode control algorithm, accurately adjusts the damping coefficient of the magnetorheological damper through a control law, inhibits the low-frequency vibration in the frequency range of 0.1-0.5 Hz, and improves the safety of the seat. The riding comfort is improved, and the motion sickness is reduced.

The invention discloses a self-adaptive noise reduction method for a positive pressure type air respirator based on airflow spectrum characteristics, and relates to the technical field of positive pressure type air respirators.The self-adaptive noise reduction method comprises the steps that a respirator air path pressure signal and an environment noise signal are synchronously collected through an airflow sensor and a microphone array; performing time-frequency analysis on the collected signals, and extracting airflow spectrum features; and establishing a mapping relation between the working state of the breathing machine and the noise spectrum based on the historical record according to the mapping relation between the working state of the breathing machine and the noise spectrum. Through real-time acquisition and analysis of airflow frequency spectrum characteristics, accurate identification of useful airflow signals and environmental noise signals, dynamic adjustment of noise reduction parameters, effective suppression of high-frequency noise and low-frequency vibration, and improvement of noise reduction effect, compared with a traditional fixed frequency band filtering or passive sound insulation material, the method can better cope with a non-stationary noise environment, and has good application prospects. The noise reduction strategy is adjusted in real time, clear auditory information is provided in a complex noise environment, and therefore the auditory perception ability of firemen is improved.

The invention discloses a gravimeter active vibration isolation control method, and belongs to the technical field of gravimeter active vibration isolation, and the control method comprises the steps: S1, presetting a three-axis acceleration sensor and a gravimeter bearing platform, and detecting a space vibration signal of the gravimeter bearing platform in real time through the three-axis acceleration sensor; s2, the signal processing unit performs frequency domain decomposition on the space vibration signal; s3, establishing a feedforward control unit, a feedback control unit and a synthesis unit; s4, a multi-degree-of-freedom actuator is preset, and reverse compensation force is applied in the X-axis direction, the Y-axis direction and the Z-axis direction through the multi-degree-of-freedom actuator according to the composite control signal; and S5, the preset state monitoring unit samples the vibration suppression rates in three continuous sampling periods. The high and low frequency vibration components are dynamically divided according to the frequency-band energy accumulation proportion, the vibration interference model is established in combination with the high and low frequency vibration components, and compensation failure caused by model mismatch under complex working conditions is avoided.

The invention relates to the technical field of vibration control, and discloses a quasi-zero stiffness vibration isolator imitating an insect jumping foot structure, which comprises a base and a bearing table between which a vertical spring is arranged, the two sets of connecting rod mechanisms are arranged between the base and the bearing table, each set of connecting rod mechanism comprises two lower connecting rods, two upper connecting rods and two middle connecting rods, the two lower connecting rods are hinged to the top face of the base, the two upper connecting rods are hinged to the bottom face of the bearing table, and the two middle connecting rods are distributed in an X shape; two ends of the two middle connecting rods are respectively hinged with the lower connecting rod and the upper connecting rod; the transverse springs are arranged at the hinged positions of the two lower connecting rods and the two middle connecting rods and the hinged positions of the two upper connecting rods and the two middle connecting rods correspondingly. The vibration isolator is simple in structure, small in transverse size, convenient to assemble and disassemble and easy to adjust, quasi-zero-stiffness vibration isolation is achieved through the special mechanical property of the overall structure, vibration energy can be efficiently absorbed, and the vibration isolator has wide application prospects in the field of low-frequency vibration control.

Disclosed are a method and system for blade tip timing measurement of full-frequency-domain vibration of a rotor blade. The method includes: identifying low-frequency, medium-frequency, high-frequency, and super-high-frequency mode parameters of the rotor blade to determine the number and mounting angles of sensors; identifying low-frequency vibration parameters based on blade tip timing according to blade tip vibration displacement; identifying medium-frequency vibration parameters based on blade tip timing according to blade tip vibration velocity; and identifying high-frequency vibration parameters based on blade tip timing according to blade tip acceleration and identifying super-high-frequency vibration parameters based on blade tip timing according to blade tip jerk. The present disclosure also provides a system for implementing the method for full-frequency-domain vibration measurement based on blade tip timing. The method for blade tip timing measurement of full-frequency-domain vibration extends the range of blade vibration frequency effectively measured by the blade tip timing technology.

The invention discloses a space variable gravity fluid storage tank in-orbit motion simulation experiment device in the technical field of space in-orbit fluid management, and the device comprises an experiment storage tank which is used for storing experiment fluid; the experiment storage box is transparent, so that a gas-liquid interface in the storage box can be observed outside the experiment storage box; the rotating mechanism is used for driving the experiment storage box to rotate so as to adjust the included angle between the experiment storage box and the centrifugal acceleration direction of the variable-gravity centrifugal platform and simulate the morphology change of a gas-liquid interface during rotating motion; the vibration mechanism is used for driving the experiment storage tank and the rotating mechanism to simultaneously perform linear reciprocating motion so as to apply translation and low-frequency vibration disturbance to the experiment storage tank and simulate the gas-liquid interface morphology change and instability phenomenon in the process that the gas-liquid interface is disturbed by external force; the experiment storage box, the rotating mechanism and the vibrating mechanism are all installed on the variable-gravity centrifugal platform.

The invention relates to a vibration absorption and isolation device structure with an additional acoustic black hole combined with a hexagonal honeycomb frame. The vibration absorption and isolation device structure comprises an upper cover plate, a lower cover plate, the hexagonal honeycomb frame and an additional acoustic black hole vibration reduction structure, wherein the upper cover plate and the lower cover plate are oppositely arranged; the bottom of the hexagonal honeycomb frame is connected with the lower cover plate while the top of the hexagonal honeycomb frame is connected with the upper cover plate; the hexagonal honeycomb frame is formed by a plurality of hexagonal cell arrays, and the section formed by sectioning a single hexagonal cell along the direction perpendicular to the cover plate is in a symmetrical hexagon shape; the bottom of the additional acoustic black hole vibration reduction structure is fixedly connected with the lower cover plate, and the additional acoustic black hole vibration reduction structure is not in contact with the upper cover plate and the hexagonal honeycomb frame. Low-frequency vibration energy is absorbed and dissipated through the additional acoustic black hole vibration reduction structure, the effects of bearing the structure and isolating a part of vibration energy are achieved through the hexagonal honeycomb frame, and the vibration reduction and noise reduction effects can be improved.

The invention belongs to the technical field of agricultural robots, and relates to a pneumatic quantitative fertilization, powder fixation and deep fertilization robot and a working method thereof.The crawler chassis is provided with a material conveying assembly, a deep scarification fertilization assembly, an air compression spray explosion assembly and an automatic following assembly, and the material conveying assembly, the deep scarification fertilization assembly and the air compression spray explosion assembly are connected through a three-way valve; the material conveying assembly is used for providing fertilizer for the deep scarification and fertilization assembly, the air compression spray explosion assembly is used for providing compressed air for the deep scarification and fertilization assembly, the deep scarification and fertilization assembly is used for conveying air and fertilizer for soil, and the automatic following assembly is used for detecting and identifying people and obstacles in the environment; a discharging motor of the material conveying assembly drives a rotating shaft and a partition plate to rotate, a discharging baffle is opened, fertilizer enters a material storage bin from a discharging bin, and the material storage bin is communicated with the deep scarification and fertilization assembly. Quantitative discharging and fertilizing are achieved, discharging is conducted in a gas pushing mode, fertilizer particles are evenly distributed, and damage caused by low-frequency vibration to equipment is reduced; and the automatic following assembly automatically follows the working personnel to walk.

The invention provides a water turbine vibration monitoring sensor system and method. The water turbine vibration monitoring sensor system comprises a space compensation mechanism, a stabilizing mechanism, a distance measuring sensor and a reflection target. The reflection target is fixedly arranged on a tested device and is used for transmitting vibration; the space compensation mechanism is connected with a tested device, the stabilizing mechanism is arranged on the space compensation mechanism, and the space compensation mechanism is used for compensating the influence of vibration on the stabilizing mechanism; the stabilizing mechanism is used for keeping the relative stability of the spatial position, the distance measuring sensor is arranged in the stabilizing mechanism, and the distance measuring sensor detects the distance data of the spatial component between the distance measuring sensor and the reflection target so as to obtain the low-frequency vibration data of the detected device. According to the invention, an active driving space compensation mechanism is arranged and is matched with a prediction compensation scheme based on artificial intelligence, so that the problem of sensor stability of a conventional stabilizing mechanism in a low-frequency state is solved. And the laser range finders are adopted to respectively collect the distance between the laser range finders and the reflection target, and displacement data are accurately obtained, so that accurate low-frequency vibration data are obtained.

The invention belongs to the technical field of equipment management, and particularly discloses a conveyor line motor residual life prediction method and system based on health indicators, and the method comprises the following steps: obtaining a low-frequency vibration signal of a motor; calculating a time domain feature sequence and a probability density function feature sequence; dividing a motor by using a K-means clustering algorithm to obtain a plurality of equipment groups; establishing a health index sub-model for the motors in the equipment group; performing mutual testing on the health index sub-models in the equipment group, performing smoothing processing and trend screening on health index testing results of all motors, and performing similarity integration to obtain a health index sequence; and predicting the residual life of the motor by using the health index model. According to the method, a composite feature extraction system and a dynamic integrated modeling framework oriented to a low-frequency sampling scene are constructed, the feature representation capability of field data can be improved, and the technical problem of high equipment group degradation isomerism is solved.

The invention relates to a robot multi-frequency vibration composite suppression method and system based on inertia disturbance analysis. The method comprises the steps of obtaining dynamic operation data in the operation process of a robot; the operation data are input into an inertia disturbance analysis module, and a low-frequency vibration source caused by a mechanical structure and a high-frequency vibration source caused by a driving system can be accurately recognized; a disturbance frequency distribution diagram is generated, according to the distribution diagram, a self-adaptive filtering algorithm is adopted to suppress a high-frequency vibration source, a compensation algorithm based on model prediction control is adopted to suppress a low-frequency vibration source, the two strategies are cooperatively processed to generate a comprehensive control instruction, the advantages of the two algorithms are fully played, and effective composite suppression of multi-frequency vibration is achieved.

The invention relates to a multi-machine cooperative dynamic balance driving method, system and device for a spiral lifting machine, and the method comprises the steps: carrying out the compensation of the time lag of an actuator through employing a non-linear state observation and time lag compensation combined method, and obtaining a feedforward control quantity; performing Lyapunov stability feedback processing on the vibration acceleration signal to obtain a vibration suppression control quantity; designing a multi-section S-shaped speed curve, and calculating a closed-loop feedback control quantity by adopting PID (Proportion Integration Differentiation) combined with a robust control algorithm; and according to the feedforward control quantity, the vibration suppression control quantity and the closed-loop feedback control quantity, multi-machine cooperative dynamic balance driving of the spiral lifting machine is carried out. According to the invention, a non-linear state observation and time delay compensation technology is adopted, so that the synchronization error is reduced to a millisecond level; the low-frequency vibration amplitude is reduced through dynamic feedback control designed based on the Lyapunov theory; the hydraulic impact is obviously reduced by adopting a multi-section S-shaped speed curve; external disturbance is observed in real time through Kalman filtering, feed-forward compensation is carried out, and the robustness of the system is greatly enhanced.

The invention belongs to the technical field of vibration isolation testing, and particularly relates to a method for testing the vibration transmissibility of an autonomous excitation active vibration isolator. The method comprises the steps of excitation signal generation and input, vibration signal acquisition, signal coherence analysis and vibration transmissibility calculation. Due to the fact that ultra-precision equipment is sensitive to environmental vibration, an active vibration isolator is usually needed when the ultra-precision equipment is used, and low-frequency vibration such as ground vibration is isolated. In order to evaluate the vibration isolation performance of the active vibration isolator, the vibration transmissibility of the active vibration isolator needs to be tested and analyzed. According to the test method, an actuator and a sensor of the active vibration isolator are adopted, and an additional excitation device and a test sensor are not needed. The method provided by the invention is simple and convenient to implement, short in time consumption and good in test effect, and can solve the technical problem of testing the vibration transmissibility of the active vibration isolator.

A power transmission line vibration energy collection device based on a triboelectricity-electromagnetic effect belongs to the technical field of power transmission line self-powered equipment, and comprises a shell, a wire clamp device, a triboelectricity unit, a vibrator structure and a cantilever beam structure, and can collect multi-frequency and multi-amplitude vibration energy of a power transmission line in the vertical direction. And the cantilever beam-magnetic coupling structure is adopted to improve the low-order modal frequency, so that the vibration frequency response range of the self-powered device is widened, and the self-powered device has the following advantages that 1, efficient low-frequency energy collection is realized, and the vibrator structure can effectively collect low-frequency vibration energy by virtue of the gravity of the vibrator structure and the action of the supporting spring; 2, the fatigue resistance is excellent, and the cantilever beam does not directly participate in excitation of the triboelectric energy harvesting unit, so that the risk of fatigue fracture of the cantilever beam is effectively reduced; and 3, the energy collection capability of the device is improved, and friction electricity energy harvesting and electromagnetic energy harvesting are combined, so that the collection efficiency of high-frequency excitation energy can be further improved.

The invention discloses a spiral air duct predictive operation and maintenance method and system based on digital twinning, and relates to the technical field of air duct system state monitoring and operation and maintenance, and the method comprises the following steps: deploying a high-frequency acoustic emission AE sensor and a low-frequency vibration acceleration sensor at key nodes of a spiral air duct, and taking a fan start-stop signal and operation power as working condition labels; a high-frequency acquisition mode is automatically triggered, noise reduction processing is carried out, and a multi-mode acoustic vibration original signal data set which is provided with a time sequence and a working condition label and is subjected to preliminary noise reduction is output; the high-frequency acoustic emission AE sensor and the low-frequency vibration acceleration sensor are arranged in the spiral duct, the health state of the thin-wall structure is monitored in real time through the high-frequency acoustic emission technology, weak early-stage fault signals in the duct can be accurately captured and early warning can be given out in the fault germination stage of fretting wear, sealant aging and the like of the spiral duct, and the fault early-warning effect is achieved. Real-time monitoring, early warning and accurate operation and maintenance of the spiral air pipe are achieved.

The invention belongs to the technical field of low-frequency vibration control, and provides a low-frequency tuned mass damping device for reversely stretching a compression spring in order to solve the problem that a traditional tuned mass damper is limited in use of a vertical space due to too large net deformation of the spring under the low-frequency condition. According to the device, large compression deformation and reverse tensile deformation of the spring are fully realized in a limited vertical space in a manner of performing super-compression-reverse tensile treatment on the compression spring, relatively low rigidity required by a vibration system is achieved, low-frequency tuning can be realized in the limited vertical space of a bridge girder, and the rigidity of the vibration system is improved. The frequency application range of the tuned mass device is greatly expanded; and meanwhile, the problems that the stability problem is caused when a traditional compression spring mass body is arranged on the spring and the damping is too high and unstable due to the fact that a guide component is added are solved. The device is simple in structure, low in damping, low in space requirement and good in stability, and can be applied to vertical, lateral and torsional multi-type low-frequency vibration control of various engineering structures.

The invention relates to the field of vehicles, and provides a local resonance damping design method and electronic equipment. The method comprises the following steps: S1, determining the resonant frequency and position of a vehicle body by analyzing the sound and vibration characteristics of the vehicle body; s2, setting an optimization constraint and an optimization target based on the determined resonant frequency, and performing optimization design on a damping structure of local resonance through first simulation software to obtain an optimized damping structure corresponding to the resonant frequency; the design parameters of the optimized damping structure at least comprise modal parameters, three-dimensional data and material parameters; s3, calculating a resonance band gap of the damping structure by using second simulation software according to the design parameters of the damping structure; s4, according to the resonance frequency of the vehicle body and the resonance band gap of the damping structure, optimization design is conducted on the damping layer; and S5, arranging the optimized damping structure and damping layer according to the analyzed vibration transmission steps. The control efficiency of low-frequency vibration can be improved, and the driving comfort of a user is guaranteed.

The invention discloses a transformer self-adaptive vibration reduction system based on a magnetorheological damper and a multi-mode cooperative control method, which are used for solving the problems of insufficient low-frequency vibration suppression and poor environmental tolerance in the prior art. The vibration reduction system comprises a sensor module, a control unit, an execution mechanism and an energy recovery module. The sensor module monitors vibration signals of a transformer iron core and a winding in real time; the control unit converts the vibration signal into a magnetic field intensity adjusting instruction in real time, and the damping force accurately matches the target demand by actively compensating disturbance and dynamically optimizing parameters; the execution mechanism comprises a dual-channel magnetorheological damper, the energy recovery module comprises a friction nanometer generator TENG and a super capacitor, the output voltage of the TENG is stored in the super capacitor after DC-DC conversion, and energy closed-loop utilization is achieved. The problems that a traditional vibration reduction device is insufficient in low-frequency suppression, prone to corrosion and high in energy consumption are solved through multi-frequency-band vibration suppression, environment self-adaption design and the self-power-supply technology.

The invention relates to the technical field of generator exhaust, and discloses a generator outlet exhaust pipe structure which comprises a connector and a vertical exhaust pipe, the bottom end of the connector is directly connected with the air outlet end of a generator, and the connector and the vertical exhaust pipe are connected through a metal bellow expansion joint. A vibration reduction component is arranged on the outer wall of the vertical exhaust pipe, and a temperature control component is arranged in the vertical exhaust pipe; the vibration reduction component comprises a fixed frame and a sliding frame, the fixed frame is connected with a wall and other fixed structures, thick springs and thin springs are used for forming a composite vibration reduction spring structure, and when the vertical exhaust pipe is subjected to low-frequency vibration, the displacement of the exhaust pipe is small, and at the moment, only the thin springs deform; when the vibration frequency rises and the displacement amount is too large, the thick spring starts to be connected with the thin spring in parallel for bearing, the variable stiffness characteristic is formed, the good vibration reduction effect is achieved, and meanwhile the damper works to absorb kinetic energy of vibration.

The invention discloses a digital stethoscope system based on a piezoelectric film, and relates to the technical field of medical electronics and biomedical engineering. An existing digital stethoscope based on a piezoelectric film has the challenges of signal noise and interference, limitation of a signal processing algorithm, nonlinear response and time migration, insufficient diagnosis accuracy and automation and the like. A piezoelectric film and microphone dual audio acquisition mode is fused, various physiological signals such as low-frequency vibration and high-quality heart and lung sound are captured, and background noise is removed through a self-adaptive filter and a frequency spectrum subtraction technology; an MFCC feature extraction and dynamic time warping algorithm is utilized to carry out fine feature analysis and time axis alignment on the preprocessed audio signal, and high-precision matching with a storage template is realized; different physiological states are accurately distinguished through intelligent feature processing, real-time and visual diagnosis feedback is achieved through wireless transmission and state indication, and the reliability and efficiency of medical detection are improved.

The present invention discloses a novel combined vibration damping device with adjustable stiffness and damping, which relates to the technical field of vibration damping; it includes a magneto-resistive stress negative stiffness spring located inside the housing and a piezoelectric friction assembly located inside the bearing seat; a central shaft is connected between the two, and a metal helical spring is sleeved outside the central shaft. The bottom of the metal helical spring is connected to a spring base located at the top of the housing, and the top of the metal helical spring is connected to the bottom of the bearing seat; the central shaft is fixedly connected to the top inside the housing through a metal cross leaf spring. The magneto-resistive stress negative stiffness spring and the metal cross leaf spring can be connected in parallel to achieve the adjustment of quasi-zero stiffness, and the piezoelectric friction assembly can achieve the adjustment of damping; a load platform is fixedly arranged at the top of the bearing seat. The present invention has non-linear frequency-varying characteristics of high static stiffness - low dynamic stiffness, large low-frequency damping - small high-frequency damping, and can well solve the contradiction between the bearing capacity and the vibration damping frequency band, as well as the contradiction between high-frequency and low-frequency vibration attenuation, and achieve high-performance vibration damping.

The utility model provides a local resonance type phononic crystal primitive cell which comprises a silicon rubber base body serving as an outer ring, a steel scatterer is arranged in an inner cavity of the silicon rubber base body, and the steel scatterer and the silicon rubber base body are connected and fixed through a soft material wrapping layer. The four spring mass subsystems are nested in the steel scattering body; a soft material wrapping layer is arranged on the side wall of the inner cavity of the silicone rubber base body. According to the utility model, a plurality of complete and directional band gaps in a low-frequency range can be effectively formed, and low-frequency elastic waves are effectively inhibited; the hollow and height difference design is adopted among the external silicon rubber base body, the steel scatterer and the spring mass subsystem, so that the vibration damping material has a sufficient deformation space to play a vibration damping role; the steel scatterer, the spring mass subsystem and other structures ensure that the anti-vibration pad has an enough supporting effect, band gap regulation and control of the local resonance type photonic crystal can be effectively achieved through material selection flexibility, and low-frequency vibration control of different frequency bands is achieved.

The embodiments of the present disclosure disclose a low-frequency vibrator unit, an antenna component, and a base station. A vibrator arm is provided to bend towards the bottom, and a director is provided with a window corresponding to an extension branch. Therefore, in an aspect, the vibrator arm occupies less space, such that more low-frequency vibrator units may be arranged in the same space. In another aspect, the window provided in the director reduces influences thereof on a high-frequency vibrator unit below and improves a cross-polarization ratio of the antenna component, such that signal space directivity of the antenna component is stronger. In yet another aspect, the antenna component occupies less space in the base station.

The invention provides a self-powered vibration sensor based on multi-mode energy capture, and the sensor comprises a multi-mode vibration energy capture unit which comprises a piezoelectric ceramic piece and an electromagnetic induction coil-permanent magnet assembly, and the piezoelectric ceramic piece and the electromagnetic induction coil-permanent magnet assembly are installed on the surface of equipment in parallel, the piezoelectric ceramic is used for capturing 100-200Hz high-frequency vibration energy; the electromagnetic induction coil-permanent magnet assembly is used for capturing low-frequency vibration energy of 5-50 Hz; the energy acquisition power supply management circuit comprises a double-path rectification filter circuit, a first bidirectional DC-DC converter and a super capacitor / lithium battery hybrid energy storage unit; the first bidirectional DC-DC converter is connected with the two-way rectification filter circuit and the super capacitor / lithium battery hybrid energy storage unit at the same time, and is used for controlling charging and discharging of the super capacitor / lithium battery hybrid energy storage unit based on a preset dynamic impedance matching network and an energy priority scheduling strategy.

The invention relates to the field of buried facility monitoring, and discloses a piezoelectric cantilever vibration sensing and super capacitor self-powered energy closed-loop operation method and system, and the method comprises the steps: building a star array composed of a master pile and a slave pile, and configuring a TDMA time slot and an uplink message length; the slave pile collects a vibration signal through a piezoelectric cantilever, the vibration signal is rectified by a piezoelectric rectification energy taking module and then charges a super capacitor, and the voltage state of the two ends of the super capacitor is obtained; when the voltage state reaches a preset upper threshold, the boosting module supplies power to the processing circuit and the transmitting circuit of the slave pile, and the processing circuit generates a four-byte feature code; the slave piles send four-byte feature codes in a magnetic induction link according to TDMA time slots, the master pile receives and aggregates the four-byte feature codes sent by the multiple slave piles, completes positioning and fusion according to the arrival time difference, and returns the four-byte feature codes to the platform through LoRa and 4G, and the platform completes storage and output according to the four-byte feature codes and a positioning result. According to the invention, end-side cloud connection and replicable deployment can be realized, and low-frequency vibration acquisition and buried communication are adapted.