106 results about "Vibration attenuation" patented technology

The invention belongs to the technical field of blasting vibration prediction, and particularly discloses a blasting vibration speed attenuation law prediction method based on regression analysis, and the method comprises the steps: laying monitoring points in multiple directions around a blasting source, synchronously collecting the geological parameters and mass point peak vibration speed of each point, and constructing a segmented propagation path; a single dominant propagation section is identified based on adjacent monitoring point data, independent influence of specific geological conditions on vibration attenuation is quantified by combining single-factor control regression analysis, decoupling modeling of geological factors and attenuation behaviors is realized, and meanwhile, a double-factor dominant propagation section is identified on the basis of quantizing the independent influence of the single geological conditions. And deducting a known effect through residual analysis to separate out an independent contribution of another geological parameter, and finally integrating a multi-factor influence function to construct a comprehensive attenuation model. Progressive modeling from single-factor decoupling to multi-factor collaboration is achieved, and the precision and physical interpretability of blasting vibration prediction in a complex heterogeneous stratum are remarkably improved.

The invention relates to a site micro-vibration attenuation test measuring point determination method and system, belongs to the technical field of vibration test, and solves the problem that vibration test measuring point arrangement depends on vibration source load accuracy or artificial experience in the prior art. The method comprises the following steps: determining a basic measuring point based on a target site parameter, obtaining an actual measurement vibration response, and calculating an actual measurement response transfer ratio; establishing an initial finite element model of the target site, and applying a preset load to the initial finite element model to obtain an initial finite element calculation result; according to the basic measuring points, corresponding model calculation points and predicted vibration responses are extracted, and predicted response transfer ratios are calculated; and performing model parameter updating by using the actually measured response transfer ratio and the predicted response transfer ratio, obtaining a basic finite element model, generating a vibration transfer form curve, obtaining vibration transfer characteristics, and determining the number and the positions of the measuring points. The micro-vibration transmission characteristics are accurately determined without depending on the vibration source load, and the number and the positions of the vibration attenuation test points are reasonably formulated.

The invention discloses a directional traffic vibration attenuation method for a periodic pile-in-row composite foundation, and relates to the technical field of traffic vibration control and foundation treatment.The method comprises the specific steps that firstly, prefabricated modular pile bodies integrating various sensors and hydraulic adjusting assemblies are arranged at preset pile positions; continuously collecting various types of traffic vibration data; transmitting to a terminal for processing, and extracting a waveform category and a load dominant frequency parameter; according to the driving assembly, wave division type regulation and control are carried out, and pile row period parameters are dynamically optimized to form double matching; and finally finishing site construction deployment. According to the invention, traffic vibration data are comprehensively and accurately captured, and the problems of incomplete data acquisition, inaccurate waveform identification and the like in the prior art are solved; a double-matching mechanism is constructed, directional regulation and dynamic adjustment of piling parameters are performed according to different wave modes, the matching degree is made to reach 90% or above, automatic optimization and targeted attenuation of different types of traffic vibration can be achieved, the vibration attenuation effect is ensured to be stable and directional, and the limitation of the prior art is broken through.

The invention discloses an electromagnetic capture connecting mechanism with a spring flexible support, and relates to the technical field of electromagnetic capture. The device comprises a base, an inner cavity of the base is fixedly connected with a fixing assembly, the inner cavity of the base is fixedly connected with a flexible supporting assembly through the fixing assembly, the top of the flexible supporting assembly is fixedly connected with an electromagnetic coil, and the flexible supporting assembly comprises a mounting boss fixedly connected to the top of the base. According to the supporting structure, rigid supporting is changed into elastic deformable supporting, the stress of the end face of the electromagnetic coil and the supporting piece is effectively reduced, meanwhile, the damping spring and the electromagnetic coil are integrally designed, the buffering function is added while the electromagnetic performance is kept unchanged, the fatigue life of the supporting piece is prolonged, and the service life is prolonged. The magnetic core and the butt joint face are kept coaxial through the elastic buffering effect, force-displacement coupling energy absorption is achieved at the same time, mechanical impact at the electromagnetic capture moment is avoided, relative vibration attenuation in the butt joint process is accelerated, and capture precision is improved.

The utility model discloses a vibration reduction component of clothes processing equipment and the clothes processing equipment. The vibration reduction component comprises a hanging rod and a damping component, the suspension rod is axially and movably arranged in the damping cavity in a penetrating manner; the damping structure is arranged on the suspender in the damping cavity in a sleeving manner; a certain distance is formed between one axial end of the damping cavity and the damping structure, so that after vibration exceeds a preset amplitude, the damping cavity abuts against the damping structure to start to generate damping force; the damping cavity is provided with air holes used for moisture removal. The ventilation holes are formed in the damping cavity of the variable-damping vibration attenuation component, the damping cavity can exhaust moisture outwards through the ventilation holes, moisture in the damping cavity can be avoided, and therefore the vibration attenuation component is prevented from being damaged or generating peculiar smells.

The application provides a design method of a broadband multi-modal vibration suppression damping material based on fractal geometry, comprising: constructing an initial geometric configuration of the damping material, the damping material being composed of a periodic arrangement of a three-dimensional unit cell structure in a plane; layering the unit cell structure to construct a parameterized model of the unit cell structure by using a fractal dimension of the unit cell structure and layer structure parameters; constructing a vibration impedance transfer equation according to the parameterized model of the unit cell structure, determining input impedances of the innermost layer and the outermost layer, and determining vibration attenuation amounts of the unit cell structure in multi-target frequency bands by using the input impedances of the innermost layer and the outermost layer; and optimizing the configuration and the parameterized model of the unit cell structure until the vibration attenuation amounts of the unit cell structure in the multi-target frequency bands meet load platform requirements. The broadband multi-modal vibration suppression damping material based on fractal geometry constructed can realize efficient dissipation of 10-1000 Hz broadband vibration energy and solve the frequency selectivity limitation of traditional homogeneous damping materials in multi-frequency vibration suppression.

The utility model relates to the technical field of neodymium-iron-boron magnet machining, and discloses neodymium-iron-boron grinding machining equipment which comprises a machining table, a moving assembly, a clamp assembly and a vibration reduction assembly. According to the neodymium-iron-boron grinding equipment, the first clamping plate and the second clamping plate are driven by the two-way screw rod to move synchronously, and a first flexible clamp and a second flexible clamp are combined, so that centering suspended clamping of a neodymium-iron-boron magnet is achieved, bottom surface contact is avoided, multi-surface grinding can be completed without repeated clamping, a worm and a worm wheel are matched and meshed, and the grinding efficiency is improved. Meanwhile, an air cylinder controls a limiting rack and a plane gear to be meshed or separated, a double-locking mechanism is formed, the anti-torque capacity is improved while the overturning precision is guaranteed, and a rubber damping block in an inner cavity of the machining table can absorb high-frequency grinding vibration; the stainless steel spiral spring arranged outside in a sleeving mode isolates vibration of low-frequency equipment, the rubber damping pad on the bottom face of the machining table is combined, the overall vibration attenuation rate can be increased, and the grinding quality is improved.

A scroll compressor is provided with a resonance part (90) that attenuates vibrations of a predetermined frequency generated by a refrigerant gas compressed by a fixed scroll and an orbiting scroll. A center-side compression chamber (20A) communicating with a discharge port (21C) formed in an end plate of the fixed scroll is formed between a scroll-shaped wrap plate (21B) of the fixed scroll and a scroll-shaped wrap plate (22B) of the orbiting scroll, and a back-side compression chamber (20B) adjacent to the center-side compression chamber (20A) is formed between the back side of the scroll-shaped wrap plate (21B) and the ventral side of the scroll-shaped wrap plate (22B). A ventral compression chamber (20C) adjacent to the center-side compression chamber (20A) is formed between the ventral side of the scroll-shaped wrap plate (21B) and the rear side of the scroll-shaped wrap plate (22B), and in the resonance unit (90), refrigerant gas is guided from the ventral compression chamber (20C) in a state where the refrigerant gas compressed in the center-side compression chamber (20A) flows into the ventral compression chamber (20C) via the discharge port (21C).

The invention relates to the technical field of mixed loading explosive trucks, and discloses a five-stage telescopic arm and dynamic stability control coupling system of an on-site mixed loading explosive truck. The system comprises a high-precision sensing system, a dynamic modeling system, a coupling control system, a precise execution system and a safety monitoring system. The arm length, the gravity center position and the rotational inertia are calculated in real time through the time-varying parameter online identification module, the coupling control system executes feed-forward compensation, envelope calculation and gain scheduling at the same time based on the time-varying parameter online identification module, and the safety monitoring system calculates the safety operation range and triggers emergency arm falling when the range exceeds the limit. A multi-sensor data fusion and weighted Kalman filtering algorithm is adopted to realize accurate positioning and dynamic stability control of the five-stage telescopic arm under a complex working condition. The technical problems that in the prior art, due to flexible deformation, parameter time varying and external disturbance, the positioning precision is low, vibration suppression is poor, and the instability risk is high are solved, and the advantages that the tail end positioning error is smaller than or equal to 5 mm, the vibration attenuation rate is larger than or equal to 88%, and the control response lag is smaller than or equal to 50 ms are achieved.

The invention discloses a strip mine blasting vibration measurement point positioning method and system based on a three-dimensional model of a blasting area, and aims to solve the technical problems that traditional blasting vibration monitoring points are high in selection randomness and low in positioning precision, and the vibration attenuation rule of a complex blasting network cannot be accurately reflected. The method comprises the following steps: performing high-precision aerial survey and three-dimensional modeling on a blasting area by using an unmanned aerial vehicle, automatically searching an optimal vibration measurement point layout in a three-dimensional terrain model of the blasting area through a multi-target intelligent optimization algorithm in combination with blasting hole coordinates and a blasting time sequence, and realizing centimeter-level precision vibration measurement point field positioning through high-precision RTK equipment. According to the method, intelligent, high-precision and scientific vibration measurement point arrangement is realized, the scientificity and precision of vibration measurement point arrangement are improved, the method can adapt to various complex blasting networks such as row-by-row blasting and hole-by-hole blasting, and a reliable data basis is provided for blasting vibration attenuation law research.

The utility model relates to a novel stamping outer ring structure with vibration and noise reduction and a vibration and noise reduction needle roller bearing in the technical field of bearings, the vibration and noise reduction needle roller bearing is provided with the novel stamping outer ring structure, and the novel stamping outer ring structure comprises an outer ring body. The outer ring body is of a triangular-like structure, the triangular-like structure is provided with three elastic arc-shaped edges which are arched outwards and connected in pairs, and the connecting position of every two adjacent elastic arc-shaped edges is in arc transition. According to the novel bearing stamping outer ring structure with the vibration reduction and noise reduction functions and the vibration reduction and noise reduction needle bearing, an original circular stamping outer ring is changed into a triangle-like special-shaped structure, when a bearing is pressed into a shell hole, the three sections of elastic arc-shaped edges are in close fit with a shaft without gaps, vibration can be reduced, and therefore noise is further reduced.

Embodiments include an attenuation support to support or mitigate movement of an element, mainly a pipe of a pipeline, in which the movement comprises vibration and / or thermal expansion. The support can include damping elements, spacer elements, a housing housing the damping elements and the spacer elements, a rod extending through the housing, in which the damping elements and the spacer elements are intercalated with each other within the housing.The rod can be mounted with radial interference in relation to the damping elements. The damping elements can be hollow discs of elastomeric material, and the spacer elements can be hollow discs of rigid material. When thermal expansion movement of a pipe occurs, the rod moves in relation to the damping elements. When the dynamic movement occurs due to vibration of the pipe, friction between the rod and the damping elements deforms the latter, causing a hysteretic damping of the movement.

The invention discloses a composite restraint layer damping vibration attenuation structure for a curved mirror, and belongs to the technical field of optical precision instruments. The structure comprises a curved lens, a viscoelastic material layer laid on the back surface of the curved lens, and a metal restraint sheet attached to the viscoelastic material layer. The core is that the metal constraint sheet has non-uniform rigidity and mass distribution in collaborative design. The cross section of the steel plate is a step-shaped outline formed by alternately connecting a plurality of web sections and wing plate sections, and preset rigidity gradient distribution in the specific direction is achieved by enabling the web sections to have the length changing in a gradient mode. And meanwhile, an opening array is integrally formed on each plate section forming the step-shaped outline, so that preset mass distribution is realized. Through collaborative design, the structure can be coupled with a plurality of high-frequency vibration modes such as bending and torsion of the lens, and energy is efficiently dissipated. According to the vehicle-mounted head-up display system, the problems of image dithering and blurring caused by lens vibration in the vehicle-mounted head-up display system are effectively solved through a lightweight and miniaturized structure.

This utility model discloses a handheld nut harvester with a cushioning function. The utility model includes a handheld part, a connecting rod, and a working part. The handheld part and the working part are connected by the connecting rod. A first cushioning mechanism for reducing impact force is provided on the connecting rod. The first cushioning mechanism is sleeved on the outside of the connecting rod, and a positioning ring is fixed inside the first cushioning mechanism on the connecting rod. The two ends of the first cushioning mechanism abut against the positioning ring via a first spring. This utility model can achieve dual cushioning for both the left and right hands. The dual cushioning structure significantly improves vibration attenuation, reduces the transmission of vibration to the user, provides better cushioning and shock absorption, improves operating comfort, reduces user fatigue, and further improves harvesting efficiency. Furthermore, the cushioning mechanism reduces the risk of wear and damage to various components caused by high-frequency impacts, extending the overall service life of the harvester.

The utility model relates to the technical field of industrial electronic equipment parts, and discloses an embedded anti-shaking handle which comprises a handle shell, a plurality of back plates are fixedly connected to the back of the handle shell, buffer assemblies are arranged on the side walls of the back plates, the buffer assemblies comprise a plurality of buffer frames, and the buffer frames are fixedly connected with the handle shell. The multiple buffering frames are arranged on the side walls of the back plates, damping rods are fixedly connected to the side walls of the back plates, the output ends of the damping rods are fixedly connected to the side walls of the buffering frames, fixing columns are arranged among the multiple back plates, and multiple sliding rings are slidably connected to the outer walls of the fixing columns. Side tables are arranged on the side walls of the sliding rings and the side walls of the buffer frames correspondingly, and rotating rods are rotationally connected between the multiple side tables. According to the utility model, the damping rod is linked with the spring and the slip ring to realize vibration attenuation and synchronously counteract multi-directional shaking, so that the steering torque is not affected by the damping force when a user actively operates, and the flexibility and accuracy of operation are kept while the external vibration is effectively isolated.

The utility model relates to the technical field of vehicle lamp cleaning, and provides a vehicle headlamp cleaning structure which comprises a bumper, a vehicle lamp, a cleaner and an ultrasonic vibrator. The vehicle lamp is positioned in the accommodating groove; the cleaning device is fixedly arranged on the bumper, and spraying holes are formed in the cleaning device and used for spraying a cleaning medium to the surface of the vehicle lamp; and the ultrasonic vibrator is fixedly arranged on the vehicle lamp. According to the automobile lamp cleaning device, the cleaning device and the ultrasonic vibrator are arranged, the ultrasonic vibrator is arranged on an automobile lamp, the automobile lamp is directly vibrated through the ultrasonic vibrator, vibration attenuation can be reduced, and the cleaning effect of the automobile lamp is improved; meanwhile, the ultrasonic vibrator is separated from the cleaning device, the overall occupied space of the cleaning device can be reduced, and reasonable distribution of the space of the vehicle body is facilitated.

The invention discloses a traffic load adaptive type periodic pile-in-row foundation vibration attenuation system, and relates to the technical field of foundation engineering and vibration control, the system comprises a traffic load adaptive type periodic pile-in-row foundation vibration attenuation system, which is characterized by comprising a parameter collaborative acquisition module for acquiring traffic load and site condition data to form a standardized data set; the integrated topological optimization module generates a row pile layout and section size optimization scheme; the non-uniform plane and variable cross-section vertical construction module completes precise construction; the closed-loop detection and adjustment module collects vibration data and adjusts a substandard area to form closed-loop control; traffic load and site data are integrated, pile arrangement and section are synchronously optimized through a topological algorithm, traditional limitation is broken through, deep adaptation is achieved, a whole-process closed-loop system is constructed, feasibility and safety are considered from data collection to detection and adjustment accurate control, the vibration reduction accuracy and the resource utilization rate are improved, and the method is suitable for large-scale popularization and application. And efficient and flexible technical support is provided for traffic scene foundation vibration control.

The invention discloses a ship-borne high-adaptability fishery catch multi-mode identification and intelligent sorting integrated device and an operation method thereof. The device comprises a fishery catch feeding module, a fishery catch detection module, a fishery catch sorting module and a control module which are connected in sequence. The catch feeding module is provided with a cleaning tank and a conveying belt with a single baffle, and the baffle is horizontally arranged; the catch detection module is integrated with a multi-sensor fusion recognition system and is combined with a pulse airflow cleaning device and a uniform distributor shifting piece to realize catch posture adjustment and high-precision recognition; the catches sorting module adopts an anti-winding spiral flow guide groove and a disc type sorting device, and soft sorting is achieved through control of an air cylinder capable of turning over a tray. The high-salt-mist and high-vibration environment is resisted, the vibration attenuation rate is larger than or equal to 85% in cooperation with a two-stage damping system, the problems that traditional equipment is low in efficiency, high in misjudgment rate and poor in multi-variety adaptability are solved, the operation cost is remarkably reduced, and the intelligent level of ocean fishery is improved.

The application provides a kind of variable pitch anti-vortex effect detection method, device and wind driven generator, the method comprises: the swing transient process of anti-vortex blade is carried out fluid dynamics simulation calculation, obtains its aerodynamic drag time series data in swing direction;Aerodynamic drag time series data is carried out multiple regression analysis, determines the interactive influence of blade root swing amplitude and incoming wind speed on the aerodynamic drag of anti-vortex blade, determines the aerodynamic drag mathematical model of anti-vortex blade;Aerodynamic drag mathematical model and the equivalent dynamic model of wind driven generator are coupled, to calculate the vibration attenuation of anti-vortex blade before and after joining aerodynamic drag, form vibration attenuation effect comparison chart.The application can effectively predict the variable pitch anti-vortex effect of wind driven generator by modeling the aerodynamic drag of anti-vortex blade and coupling calculation with the structural dynamic model of wind driven generator, which is lower in cost compared to field test and wind tunnel model test, but more accurate than engineering algorithm.

The invention discloses a monitoring software system for a curing state of an airflow-excited lining and an implementation method thereof, and the monitoring software system comprises a system monitoring module, a parameter setting module, a data collection module, a characteristic parameter extraction module and a curing state modeling and judgment module. The system monitoring module realizes state monitoring and condition guarantee of hardware equipment; the parameter setting module is used for configuring and controlling parameters of key hardware equipment; the data acquisition module is used for realizing real-time binding and storage of deformation data and space coordinates; the characteristic parameter extraction module automatically identifies and extracts dynamic characteristic parameters of the maximum deformation quantity, the residual deformation quantity and the vibration attenuation time; and the curing state modeling and judging module inputs the characteristic parameters extracted in real time into a fitting model, and calculates the current curing state grade through a similarity matching algorithm. The method has the characteristics of high detection precision, high adaptability, simplicity and convenience in operation and the like, and can effectively meet the detection requirement of the curing state of the lining material.

The invention discloses a vibration active control method based on a PPO-HAFxLMS algorithm, and relates to the field of vibration active control. The method comprises the following steps: determining a target vibration frequency band needing to be suppressed and a vibration attenuation standard so as to determine configuration of related hardware in the vibration active control system; capturing an external disturbance signal received by the controlled object; and on the basis of the time domain data of the external disturbance signal, a required control voltage signal is generated in real time by using a PPO-HAFxLMS algorithm, and vibration suppression is realized. According to the method, on the basis of a traditional FxLMS algorithm, a feedback channel is added to form a HAFxLMS algorithm, filter coefficients and step length updating are optimized through the HAFxLMS algorithm, the step length and the weight of a filter are dynamically adjusted according to the correlation between error signals and input signals and the change of the environment through a PPO reinforcement learning algorithm, and therefore the convergence speed and the steady-state error of vibration control are optimized, and the stability of vibration control is improved. And the vibration suppression effect is obviously improved.

The utility model provides an architectural decoration modeling suspended ceiling structure of a deformable acoustic board. The two ends of a frame are connected with supporting pieces through frame units, and the middle position of the frame can be connected with a hanging rod through a frame; the molding contour surface of the frame faces the different side of the supporting piece and is used for installing a deformable acoustic board. The multiple frames are connected in a matched mode through welding and / or self-tapping screws by adopting a contour line positioning method, and the building decoration modeling suspended ceiling structure of the deformable acoustic board is formed. Through a special-shaped molded surface and positioning groove double-control system, the three-dimensional curved surface modeling deviation is smaller than or equal to 1.5 mm; the vibration attenuation rate of the acoustic board is greatly improved through composite fixation of the structural adhesive and the screws; the design of the C-shaped steel flexible groove enables the forming precision of the frame to be improved to more than 99%.

The present disclosure relates to a mass leveling system and method for a hemispherical resonator, the system comprising: an excitation module for exciting the hemispherical resonator to be leveled to generate vibration; a laser interferometer comprising at least two detection probes for collecting vibration information of at least two positions of the hemispherical resonator; an ion beam etching module for etching the hemispherical resonator using an ion beam; and a control module for determining the orientation of the vibration principal axis of the hemispherical resonator and the size of frequency splitting according to the vibration information of the at least two positions of the hemispherical resonator in the vibration decay process; and controlling the ion beam etching module to etch the hemispherical resonator using the ion beam according to the orientation of the vibration principal axis of the hemispherical resonator and the size of frequency splitting, so as to realize mass leveling of the hemispherical resonator. Thus, mass leveling with higher precision and high automation can be realized without reducing the quality factor of the hemispherical resonator.

The invention relates to the technical field of intelligent medical bionics, and discloses an intelligent sputum excretion method and system and a storage medium. The method comprises the following steps: receiving three types of real-time monitoring signals, namely respiratory airflow waveform, thoracic cavity vibration frequency and laryngeal sound spectrum, and carrying out space-time alignment and coupling processing on the signals to generate a multi-dimensional physiological state image. Analyzing the image to extract three types of physiological modes corresponding to sputum accumulation, namely limited airflow, vibration attenuation and turbid sound, and inputting the physiological modes into a bionic decision core; the core simulates a human body autonomous sputum excretion nerve reflex mechanism, the mechanism is compared with a standard sputum excretion reflex mode library, a sputum excretion trigger instruction containing intensity grade and duration parameters is generated, and sputum excretion intervention is executed. The system can dynamically update the physiological state image, adjust the instruction based on the response change atlas, and realize the early accurate recognition and intelligent bionic decision of the expectoration demand.

The invention discloses a floating fan tower drum circular ring type TMD-TLD damping vibration attenuation device, and belongs to the technical field of wind power, the vibration attenuation device is composed of a reset spring, a horizontal arc guide rail, a damping module, a through hole, a piston rod and a guide rail tray, the reset spring is connected to the vibration attenuation device, the vibration attenuation device is connected to the interior of a tower drum, and the horizontal arc guide rail is connected to the damping module. Horizontal arc guide rails are installed on the two sides of the reset spring and fixedly installed on the circumferential inner wall of the tower drum through guide rail trays, damping modules are installed at the outer ends of the two horizontal arc guide rails, through holes are distributed in the damping modules, and three piston rods are distributed in the middles of the damping modules; according to the circular ring type TMD-TLD combined damping vibration attenuation device, the horizontal and vertical vibration control technology is innovatively provided, an efficient, compact and sustainable vibration attenuation solution is provided for a floating type fan, the economical efficiency and reliability of wind energy development are improved, and the vibration attenuation effect of the floating type fan is improved. And a key support is provided for large-scale and deep sea deployment of the floating fan.

The application discloses a kind of rail transit along line vibration isolation barrier design optimization method, specifically related to rail transit vibration control technical field;Stratum impedance parameter set is constructed along line;On this basis, track-stratum coupling vibration propagation model is established, the vibration propagation process under the action of train excitation is simulated, and vibration energy distribution matrix is obtained;The vibration energy gradient change rate is calculated to construct the channel characteristic parameter set;According to the channel characteristic parameter, the vibration isolation barrier candidate structure set intersected with abnormal energy channel is generated, and the vibration attenuation efficiency of each candidate structure is calculated by vibration propagation simulation;Combined with vibration energy information entropy, a comprehensive evaluation index is constructed to determine the optimal vibration isolation barrier structure parameter combination;The application can accurately identify the vibration abnormal propagation path and realize the optimization design of vibration isolation barrier structure parameters, improve the isolation effect and engineering applicability.

The utility model relates to the technical field of noise reduction devices, in particular to a noise reduction device for bearing machining, which comprises a noise reduction pad and anti-skid particles, the anti-skid particles are fixedly connected to the lower side of the noise reduction pad, a vibration and noise reduction mechanism is arranged on the inner side of the noise reduction pad, the vibration and noise reduction mechanism comprises a fixed cylinder, and the inner side of the fixed cylinder is tightly attached to a rubber ring sleeve. A movable bearing table is slidably connected to the inner side of the rubber ring sleeve, a piston sleeve sleeves the outer side of the movable bearing table, the lower side of the piston sleeve is tightly attached to the upper end of the noise reduction spring, a connecting through hole is formed in the inner side of the side edge of the lower end of the fixing cylinder, and a damping vibration attenuation assembly is fixedly connected to the outer side of the fixing cylinder and comprises a communicating pipe; according to the multi-layer structure design and the hydraulic damping principle, effective buffering of mechanical vibration and remarkable reduction of noise are achieved, and the vibration reduction and noise reduction performance and stability of the device are further enhanced through structural optimization and detailed design of each further-implemented scheme.

The invention discloses an intelligent damping material prepared from a piezoelectric ceramic complex and a preparation method of the intelligent damping material, and belongs to the technical field of vibration control materials. The material is of a three-layer composite structure including an elastic matrix layer, a piezoelectric ceramic composite layer and a restraint layer, wherein the piezoelectric ceramic composite layer is formed by compounding 30%-50% of piezoelectric ceramic particles, 5%-15% of conductive filler and 35%-65% of a polymer binder; the shore hardness of the elastic matrix layer is 30D-60D, and the elastic modulus of the restraint layer is 20GPa-80GPa. The preparation method comprises the key steps of piezoelectric ceramic particle silane coupling agent modification, composite slurry high-speed mixing, elastic matrix layer vulcanization molding, matrix surface plasma treatment, gradient hot-pressing composite curing and the like. Through interface modification and three-dimensional conductive network construction, the interface bonding strength and energy dissipation efficiency are greatly improved, the damping loss factor tan delta of the material is larger than or equal to 0.3 in the wide temperature range of-50 DEG C to 150 DEG C, the vibration attenuation rate of the material is larger than or equal to 40%, the material is suitable for vibration control of aerospace, rail transit and precision machinery, the preparation process is simple and convenient, and large-scale production is easy.

A vibration actuator has a fixed body including a coil, a movable body including a magnet disposed on the inner side of the coil in a manner so as to be relatively movable in a vibration direction orthogonal to the radial direction of the coil, and an elastic support portion supporting the movable body in a manner so as to be freely movable relative to the fixed body, in which the movable body vibrates relative to the fixed body by cooperation of the coil supplied with electric power and the magnet, and the elastic support portion has an outer peripheral portion fixed to the fixed body, an inner peripheral portion disposed at a position more on the inner side in the radial direction than the outer peripheral portion and fixed to the movable body, and a deformation arm portion disposed between the outer peripheral portion and the inner peripheral portion, linking the outer peripheral portion and the inner peripheral portion and being elastically deformable, in which an attenuation portion is provided across the outer peripheral portion and a portion of the outer peripheral portion side of the deformation arm portion, the attenuation portion attenuating vibration at the elastic support portion when the movable body moves.

The invention provides a pile sinking vibration intelligent monitoring method and device. The method comprises the steps that S1, acceleration signals in the pile sinking process are synchronously collected through a plurality of three-axis inertial sensors deployed in a to-be-monitored area; s2, the data processing terminal converts the acceleration signal into a speed time domain signal and performs interference filtering to obtain effective PGV data; s3, performing real-time curve fitting on the effective PGV data of different monitoring points through a nonlinear least square method, dynamically correcting a vibration attenuation coefficient, and automatically calculating a dynamic safety distance according to a preset safety threshold value; s4, a composite vibration isolation barrier is constructed between the construction area and the protected building according to the dynamic safety distance and the real-time vibration monitoring result; and S5, monitoring the vibration reduction rate after the construction of the composite vibration isolation barrier in real time, and dynamically adjusting the layout parameters of the stress release holes according to the deviation between the vibration reduction rate and the target limit value to realize accurate vibration over-filtering.