335 results about "Vibration attenuation" patented technology

The invention relates to the technical field of transformer substations, and particularly discloses a transformer substation channel cover plate data acquisition and intelligent analysis management system and method, and the method comprises the steps: collecting cover plate vibration data and strain data through an acceleration sensor and a resistive strain gauge; vibration direction change, vibration attenuation and cover plate deformation springback time are extracted from acceleration data, the maximum amplitude, the change rate and the strain gradient are extracted from strain data, and the stress deformation characteristics of the cover plate are comprehensively represented; based on the stress deformation and springback characteristics of the cover plate, a damage evaluation model is established by adopting a neural network model, and intelligent judgment of the damage degree of the cover plate is realized; predicting a damage change trend by using a neural network, and calculating a cover plate damage acceleration trend; and according to the damage evaluation result and the damage acceleration trend, calculating the remaining to-be-maintained time of the cover plate, and automatically triggering operation and maintenance early warning when the remaining to-be-maintained time is lower than an early warning threshold value. According to the method, intelligent monitoring, prediction and active operation and maintenance management of the health state of the cover plate can be realized.

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 provides a ballastless track joint performance degradation monitoring method and system, and relates to the technical field of track joint performance monitoring, and the method comprises the steps: knocking a ballastless track plate at a track joint through a force hammer to generate excitation, collecting a vertical vibration acceleration response signal through an acceleration sensor, and synchronously recording the knocking time and static parameters. The vertical vibration acceleration response signal is preprocessed, abnormal pulses and baseline drift are removed, a vibration event sample is formed, and joint mechanics characteristic parameters including a vibration frequency parameter reflecting rigidity degradation and a vibration attenuation parameter reflecting damping are extracted. According to the method, the joint performance evaluation index is calculated in combination with the static parameters, the degradation grade is evaluated after the evaluation index is compared with the preset threshold value, an early warning signal is triggered, the joint degradation grade and position information are provided, and monitoring and evaluation of the joint performance are achieved.

The invention relates to sea and air three-dimensional unmanned rescue equipment which comprises a large-load unmanned aerial vehicle platform, a sea life rescue platform, a suspension assembly and a flexible buoyancy platform which are connected in sequence. The heavy-load unmanned aerial vehicle platform is fixed to the upper portion of the offshore life rescue platform in a rigid connection mode. The suspension assembly comprises a main ship body and a multi-body buffer structure connected with the main ship body and the flexible buoyancy platform. The multi-body buffering structure comprises a front arch, a first rear arch, a second rear arch, a first rigid sliding plate, a second rigid sliding plate, a first rocker arm type spring damping vibration attenuation module and a second rocker arm type spring damping vibration attenuation module. The first rigid sliding plate and the second rigid sliding plate are connected with the flexible buoyancy platform. Compared with the prior art, cooperation of safe take-off and landing from a mother ship, hovering search, high sea condition stable operation and flexible rescue is achieved through the four-module integrated design; rescue equipment can be quickly replaced, diversified rescue requirements are met, operation is flexible, and taking-off and landing are safe and convenient.

The invention provides an innovative design of a corrugated pipe damper integrated on a sliding main bearing aiming at the problems of transmission system abrasion and fatigue damage caused by vibration energy accumulation of the wind power main bearing under a complex wind load, and belongs to the technical field of wind power generation equipment. A traditional main bearing damping structure is low in energy absorption efficiency, insufficient in dynamic response and difficult to effectively suppress vibration. Through collaborative design of a corrugated pipe multi-stage laminated structure and a fluid energy dissipation channel, a composite mechanism for dynamically dissipating vibration energy is formed. The core of the damping device is composed of a corrugated pipe assembly, damping cavities and a main shaft adaptive structure, impact energy is absorbed through axial flexible deformation of the corrugated pipe, vibration attenuation is achieved in combination with reciprocating flowing of damping fluid in the multiple cavities, and low-frequency swing and high-frequency harmonic waves of a main bearing are synchronously restrained. According to the design, the bearing capacity is guaranteed, vibration transmission is remarkably reduced, the service life of the main bearing is effectively prolonged, the operation reliability of a unit is improved, and the damping requirement of a core transmission system of a high-power wind turbine generator is met.

The invention relates to the technical field of engineering structure vibration reduction, in particular to a pressure-resistant and low-frequency vibration reduction light sandwich cylindrical shell structure which is obtained by a unit cell circumferential array and a linear array. Each unit cell comprises an inner panel, an outer panel and a grid interlayer, and the inner panel, the outer panel and the grid interlayer are made of the same material. The Archimedes spiral resonance groove is accurately engraved in the inner panel, so that the local resonance effect is excited, and effective vibration attenuation is achieved. The structure has the characteristics of integration of light weight, vibration reduction and noise reduction functions, wide vibration reduction frequency range, good hydrostatic pressure resistance, easiness in manufacturing and the like. And meanwhile, certain sound absorption performance can be realized without changing external geometric characteristics of the structure and adding extra materials.

The invention relates to a multi-layer sound absorption and insulation material and a preparation method thereof.The multi-layer sound absorption and insulation material comprises an inner micropore sound absorption layer, a vibration attenuation damping layer, a sound insulation plate layer, a main frame layer, a sound absorption material layer and an outer steel plate layer which are sequentially arranged from inside to outside, a plurality of hollow glass balls are evenly arranged in the main frame layer, and the sound absorption material layer is obtained by pressing multiple layers of composite sound materials; the composite acoustic material comprises the following raw materials in parts by weight: 10-15 parts of fibers, 4-8 parts of an adhesive, 3-8 parts of a foaming agent, 1-3 parts of a flame retardant, 10-20 parts of a plasticizer, 10-20 parts of resin, 1-3 parts of a lubricant, 5-10 parts of an organic sound absorber and 1-5 parts of an antioxidant. According to the sound absorption and insulation material, the inner micropore sound absorption layer, the vibration reduction damping layer, the sound insulation plate layer and other multi-layer structures are arranged from inside to outside, all the layers have a synergistic effect, sound wave propagation can be dealt with from multiple aspects, and the sound absorption and insulation material is suitable for various places with requirements for the acoustic environment, such as the fields of building sound insulation, industrial equipment noise reduction and the like.

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 present invention relates to an active damper (1) for vibration attenuation in a boring bar (100) comprising an actuator (101) with electromagnets (4) attached to a body (2) thereof, and an inertial mass (3) in a cavity (12) of the actuator (101) movable in directions perpendicular to the longitudinal direction of the actuator (101); comprising an acceleration sensor (5) in the actuator (101) and control means (9) of currents of the electromagnets (4) depending on the measurements of the acceleration sensor (5).

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 invention discloses an epoxy resin-based composite material with vibration damping performance and a preparation method and application thereof, and belongs to the technical field of carbon fiber reinforced composite materials. The carbon fiber reinforced epoxy resin matrix composite material is prepared from the following raw materials in parts by weight: 80-120 parts of epoxy resin, 10-50 parts of a curing agent and 5-10 parts of carbon nanotube / molybdenum disulfide and micron rubber co-embedded damping particles. The epoxy resin-based composite material disclosed by the invention is simple in raw materials, can be commercialized, and meets the low-altitude economic development requirements and the application requirements of aviation aircrafts; and the composite material has high specific strength, high damping vibration attenuation performance, electrical insulation performance and the like, and has a good application prospect in preparation of aircraft skin parts.

The invention discloses a water-turbine generator set damping device which comprises a main structure module comprising a damping vibration attenuation unit composed of a first linear spring, a first linear damper and a first mass block; the NES module comprises a second mass block, a first cavity coaxial with the second mass block is arranged in the second mass block, and an eddy current damping unit is arranged in the first cavity; the U-shaped flexible hinge comprises a U-shaped damping cylinder and a U-shaped flexible hinge unit arranged in the damping cylinder, the flexible hinge unit comprises a plurality of unit double-shaft flexible hinges which are sequentially connected in series through a connecting base body, the damping cylinder is filled with magnetorheological fluid, and the two ends of the flexible hinge unit are connected with the damping cylinder respectively. By adopting the combination mode of the main structure module, the U-shaped flexible hinge and the NES module, the vibration frequency band of 10-200 Hz can be covered, broadband vibration reduction is achieved, the vibration amplitudes in different directions such as the axial direction and the radial direction can be absorbed, and the vibration reduction requirement of a water turbine generator set in the complex hydraulic environment can be met.

The invention discloses an active and passive composite vibration reduction system, and particularly relates to the technical field of vibration reduction equipment, the active and passive composite vibration reduction system comprises a bottom shell, a load platform, a passive vibration reduction device and an active vibration reduction device, and the passive vibration reduction device and the active vibration reduction device are both arranged between the bottom shell and the load platform; the passive damping device comprises a positive stiffness mechanism and a negative stiffness mechanism which are arranged in parallel; the active damping device comprises a controller, a sensor, a piezoelectric actuator and a flat plate type voice coil motor, the sensor is fixed on the load platform, the sensor, the piezoelectric actuator and the flat plate type voice coil motor are all in signal connection with the controller, and the controller processes signals transmitted by the sensor and transmits commands to the piezoelectric actuator and the flat plate type voice coil motor. The method has higher control precision, stronger anti-interference capability and more excellent adaptability and flexibility, the inherent frequency and the formant peak value of the damping device are effectively reduced, the high attenuation of high-frequency vibration is ensured, and broadband vibration attenuation is realized.

The invention discloses an anti-vibration stabilizing device for an air outlet pipeline of an electrolytic cell, a ring-shaped pipe frame is arranged on the periphery of a material pipeline in a full-surrounding or partial-surrounding manner, and a multi-layer composite vibration isolation part is filled between the inner side of the ring-shaped pipe frame and the contact side of the material pipeline; a self-adaptive damping adjusting piece is arranged between the ring-shaped pipe frame and the fixed frame body; the device further comprises a vibration data acquisition mechanism arranged on the material pipeline. And the multi-layer composite vibration isolation part has the wear-resisting and broadband damping capabilities through the wear-resisting layer and the damping layer, and the high-frequency vibration attenuation rate is larger than or equal to 90%. A honeycomb air cavity and a closed cavity are filled with media or open cavity micropores are designed, the rigidity and damping can be adjusted in a self-adaptive mode, and low-frequency buffering or specific-frequency resonance suppression is achieved. The regular hexagonal honeycomb structure is high in geometric stability and uniform in stress dispersion, the material consumption is reduced by 30-40%, the weight is reduced, and the anti-fatigue life is prolonged. The air cavity is axially and flexibly arranged, vibration in different directions is absorbed in a targeted mode, and the multi-dimensional damping effect is improved.

The utility model belongs to the technical field of damping vibration attenuation, and particularly relates to a viscous damper structure which comprises a damping cylinder body, a viscoelastic damping body is arranged at the top of the damping cylinder body in a sealing mode, a viscous damping body is filled in the damping cylinder body, and a movable shaft body penetrates through the middle of the viscoelastic damping body. One end of the movable shaft body extends into the viscous damping body and is provided with a movable terminal; the movable shaft body is of a hollow structure and is internally provided with an adjusting shaft, one end of the adjusting shaft is provided with an adjusting disc abutting against the movable terminal, and the movable terminal and the adjusting disc are provided with damping adjusting holes which are aligned in a one-to-one mode. The viscoelastic damping body is made of a pouring type high-damping material, has excellent vibration reduction characteristic, waterproof performance and sealing characteristic and basically has no additional rigidity, and the viscous damping body is made of a liquid type high-damping material, and is excellent in damping function and simple in structure; and meanwhile, the size of the damping adjusting hole in the movable terminal can be adjusted by rotating the adjusting disc, so that the purpose of adjusting the damping is achieved.

The invention discloses an aerodynamic damping rapid estimation method for a rotating blade, and the method comprises the steps: selecting a test impeller, obtaining an attenuation signal of a blade of the test impeller based on an impact test, and obtaining a structural damping ratio of the blade according to the attenuation signal through a free attenuation method and a nonlinear least square method; a BTT test technology is introduced, and the total damping ratio of the blade is obtained based on the BTT test technology and a nonlinear least square method; based on the structural damping ratio and the total damping ratio of the blade, an aerodynamic damping estimated value of the blade is obtained, and estimation of aerodynamic damping is achieved; according to the method, the BTT data analysis technology and the free vibration attenuation theory are combined, quantitative estimation of the aerodynamic damping ratio of the rotating blade is achieved, and the aerodynamic damping ratios of all the blades under different vibration pitch diameters can be determined; the pneumatic damping contribution of the rotating blade is quantitatively expressed, the vibration response mechanism of the blade in the service state can be deeply understood, and long-acting safe operation of a unit is guaranteed.

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 relates to the technical field of functional materials, in particular to a supramolecular aggregate modified vinyl resin material and a preparation method thereof. The supramolecular aggregate modified vinyl resin material is prepared from the following raw materials in parts by weight: 1.3 to 4.6 parts of aliphatic isocyanate monomer, 5 to 15 parts of micromolecular polyol, 0.8 to 2.9 parts of ureido pyrimidone monomer, 1 to 3 parts of curing agent, 50 to 100 parts of vinyl resin and 0.5 to 2.3 parts of accelerant, so that the modified vinyl resin material has reversible dynamic mechanical property; good damping vibration attenuation performance can be provided; and the material has good mechanical properties and excellent impact toughness, and can be widely applied to various fields as a high-performance functional material.

The embodiment of the present application provides a floor vibration monitoring method and device, electronic device, system and storage medium, the method comprising: obtaining sensing data of a vibration sensor, the vibration sensor is set on a target device, and multiple target devices are placed in a target area; obtaining floor vibration data of the target device based on the sensing data of the vibration sensor; adding the boundary conditions and vibration attenuation function of the target area and the floor vibration data of the target device to the two-dimensional dot matrix of the target area to form a parameter matrix; generating single-source vibration distribution data of multiple target devices based on the parameter matrix; synthesizing the single-source vibration distribution data of multiple target devices into multi-source vibration distribution data of the target area. The vibration data of multiple equipment points can be obtained at the same time, improving the detection efficiency and data accuracy, and the vibration conditions of the monitoring area are reflected by combining the vibration source distribution data of multiple equipment points in the parameter matrix.

The invention relates to a suspension system and a vehicle, the suspension system comprises a power assembly and a semi-active damping pull rod, the semi-active damping pull rod is arranged at at least one end of the power assembly in the Y direction of the whole vehicle, one end of the semi-active damping pull rod is connected with the power assembly, and the other end of the semi-active damping pull rod is connected with an auxiliary frame; the semi-active damping pull rod is arranged at at least one end of the power assembly in the Y direction, so that the dynamic stiffness of the suspension system is lower and the vibration isolation performance is better under the idling and acceleration working conditions, the damping is larger under the low-frequency starting working condition, and the vibration attenuation of the power assembly is faster.

The invention relates to a multi-mode cooperative damping vibration attenuation method for a large-span bridge girder. The multi-mode cooperative damping vibration attenuation method comprises the following steps that the type and corresponding structural characteristics of the large-span bridge girder are determined; determining a target vibration reduction design requirement according to the girder type, wherein the target vibration reduction design requirement comprises a frequency range of vortex-induced vibration under different wind attack angles, a damping ratio minimum value corresponding to each order of frequency under a vertical modal shape, and a damping ratio minimum value corresponding to each order of frequency under a torsional modal shape; and determining a cooperative control scheme of the tower beam damper and the tuned mass damper mounted on the large-span bridge on the multi-modal vibration of the main beam according to the target vibration reduction design requirement. According to the multi-mode cooperative damping vibration attenuation method for the large-span bridge main beam, the tower beam damper and the tuned mass damper are installed on the large-span bridge main beam at the same time to be used in a combined mode so as to complete cooperative vibration attenuation design, and the purposes of improving the vibration attenuation effect and achieving full coverage of multi-mode vibration frequency are achieved. The problem of vortex-induced vibration reduction of the large-span bridge girder is solved.

The invention discloses a shock absorber and a subway vibration isolation trench applying the shock absorber. The shock absorber comprises an extension spring, a mass block, a supporting frame and a damper, and the extension spring is connected to the bottom of a passing plate; the mass block is connected with the extension spring; one end of the actuator is connected with the passing plate, and the other end is connected with the mass block; the support frame is mounted in the vibration isolation trench; one end of the damper is hinged with the support frame, and the other end is hinged with the mass block. The actuator applies real-time controllable braking force, vibration can be dynamically and reversely counteracted, the effective frequency band can be expanded, vibration under non-design working conditions can be restrained, the extension spring provides passive elastic restoring force, the system inherent frequency is adjusted, the main structure vibration frequency is matched, the damper dissipates kinetic energy, transient response is restrained, and therefore the resonance peak value is reduced, and vibration attenuation is accelerated. Through cooperation of the actuator, the extension spring and the damper, deep fusion of passive frequency tuning and active dynamic compensation is realized, and a broad-spectrum self-adaptive vibration control system is formed.

The invention discloses an intelligent shafting vibration control system and method. The method comprises the steps that system hardware is set up, an eddy current displacement sensor is installed at a key position to monitor vibration displacement, an electromagnetic actuator is installed on a bearing seat to control bearing rigidity and damping through current, and a data acquisition and analysis system is configured to be connected with the sensor and the actuator and complete parameter setting; the method comprises the following steps: designing a vibration control algorithm, establishing a kinetic model and a noise model, solving an optimal feedback gain matrix and a state estimation value to calculate a control force, optimizing linear quadratic Gaussian (LQG) control parameters by using particle swarm optimization (PSO), defining a target, initializing, calculating fitness, updating particle parameters until conditions are met, and outputting an optimal solution; debugging and optimizing the system according to an actual operation condition, adjusting control parameters, and optimizing an algorithm and a structure to improve control performance and robustness; and finally, system testing and evaluation are carried out, performance and robustness tests such as vibration attenuation rate, control precision, response speed and stability under interference and noise are covered, and efficient and stable vibration control is realized.

The invention discloses an underground blasting safety assessment method and device based on the BIM technology and a medium, and relates to the technical field of underground engineering safety assessment, and the method comprises the steps: collecting blasting geological data, blasting design parameters and surrounding environment information of a blasting site, and constructing a blasting region BIM model; performing blasting vibration spectrum analysis on the blasting geological data and the blasting design parameters, extracting vibration spectrum data, integrating the vibration spectrum data into a blasting area BIM model, dynamically displaying a vibration attenuation field through a finite element analysis algorithm, and obtaining a vibration attenuation graph; performing three-dimensional modeling by analyzing a stress concentration area in the vibration attenuation map and the vibration spectrum data and combining geological information in the BIM model of the blasting area, predicting a fracture extension path in the blasting process, and identifying a high fracture propagation risk area; and potential risks in blasting operation are effectively reduced, and safety protection on personnel and the environment in the construction process is ensured.

The invention provides an electric control shock absorber control method and device, a vehicle and a computer readable storage medium, and relates to the technical field of vehicle control. The method comprises the steps that for an electric control shock absorber corresponding to each wheel, expected damping force needing to be generated by the electric control shock absorber is determined; according to the expected damping force and the actual driving mileage of the vehicle, compensation is conducted on control current of the electric control shock absorber, and compensation control current is obtained; and the compensation control current is adopted to control the electric control shock absorber to work, so that the actual damping force generated by the electric control shock absorber reaches the expected damping force. The control current of the electric control shock absorber can be compensated, so that the problem of damping force reduction caused by performance attenuation of the electric control shock absorber is compensated, the vibration attenuation effect is guaranteed, and the running stability of a vehicle is kept.

The invention discloses a method, device and equipment for indirectly testing the rigidity of a plate spring and a storage medium, and relates to the technical field of plate spring tests.The method comprises the steps that acceleration sensors are arranged above and below a to-be-tested plate spring, and all wheels of a vehicle are driven to fall off from platforms of the same style at the same time; fitting to obtain a free vibration attenuation curve of the sprung object based on the relative acceleration between the accelerations recorded by the two acceleration sensors; and obtaining the rigidity of the to-be-tested plate spring according to the time interval when the plate spring is in the compression state for the first time and the time interval when the plate spring is in the compression state for the second time in the free vibration attenuation curve of the sprung object and the sprung mass of the to-be-tested plate spring. According to the method, the rigidity of the plate spring in the dynamic state of the whole vehicle is associated with the rigidity of the plate spring in the static state of the whole vehicle, the theoretical rigidity of the plate spring can be measured on the premise that the plate spring is not disassembled through measurement under the condition of the whole vehicle, and the labor amount and the disassembly time are reduced.

The invention discloses a partition blasting construction analysis method for a tunnel crossing a cultural relic protection area, and relates to the technical field of blasting construction, and the method comprises the steps: building a three-dimensional geologic model and a cultural relic three-dimensional model, and constructing a finite element modal analysis environment of the blasting construction of the cultural relic protection area; the method comprises the following steps: applying a cultural relic resonance frequency in a finite element modal analysis environment of blasting construction in a cultural relic protection area, determining a limit damage threshold value of a cultural relic and a cultural relic danger node, and calculating an initial limit value of a blasting vibration safety speed according to the limit damage threshold value of the cultural relic and the cultural relic resonance frequency; calculating a cultural relic vulnerability evaluation index according to the cultural relic vulnerability influence data, and correcting the blasting vibration safety speed initial limit value to obtain a blasting vibration safety speed correction limit value; and delimiting a three-level risk area according to the cultural relic vulnerability evaluation index, and calculating and outputting the explosive quantities of the buffer area and the general construction area by using a Sadgowski formula as a vibration attenuation model. Construction vibration is ensured to be within a safety threshold, and the risk of damage to cultural relics is reduced.

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.

A solar heliostat with pneumatic flow guide load shedding and friction damping vibration attenuation functions comprises a main beam, a plurality of auxiliary beams perpendicularly fixed to the main beam, a connecting piece fixed to the main beam, a plurality of inclined struts connecting the connecting piece and the auxiliary beams and the like. The supporting rod is fixed to the main beam, the friction damper is installed at the tail end of the supporting rod, the steel cables are connected with the friction damper, the main beam and the auxiliary beam respectively, and the triangular-prism-shaped covering body wraps the inclined struts in an attached mode. The friction damper comprises a friction base body, a friction element connected with a steel cable, a pressing plate matched with a friction concave surface of the friction base body to clamp the friction element, a pressure adjusting structure A for adjusting the pressing force of the pressing plate, a guide roller for guiding the steel cable connected with the friction element, and a pressure adjusting structure B for adjusting the tension force of the connected steel cable, according to the invention, airflow separation is guided to reduce the wind load through the prism aerodynamic configuration on the back of the heliostat; the friction force of each friction element and the pre-tightening force of the connected steel cable are independently set, the outer rigidity of the heliostat surface is enhanced, wind disturbance vibration is reduced, and the service optical 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.