157 results about "Dynamic stiffness" patented technology

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 industrial robots, in particular to a dynamic simulation damping parameter solving method based on a gravity compensation mechanism, which comprises the following steps of: acquiring a joint basic parameter set of a to-be-tested industrial robot, and determining a test boundary condition according to the joint basic parameter set, and constructing a test task sequence based on the test boundary conditions. According to the method, the fusion weight of the static stiffness and the dynamic stiffness is intelligently adjusted according to the characteristics of the movement speed, the acceleration or the force control frequency band in a specific application task, and the limitation of a single parameter under complex and changeable working conditions is avoided. According to the parameter fusion mechanism aiming at the specific task characteristics, the generated joint comprehensive rigidity parameters can truly reflect the physical response of the robot in different operation stages, and the prediction error between the physical simulation environment and the actual physical operation is reduced; and the strict requirements of high-precision scenes such as semiconductor packaging and the like on micron-level positioning precision and force control stability are met.

The invention relates to the technical field of monitoring and alarming, in particular to an intelligent orthopedic rehabilitation training monitoring system based on multi-modal sensing, which comprises a basic data synchronous acquisition module, a dynamic stiffness differential analysis module, a defensive contraction judgment module and a load boundary dynamic reconstruction module. According to the method, a time sequence is constructed by synchronously collecting joint angle and moment data, an instantaneous dynamic stiffness change trend is analyzed by combining a moment and angle difference value, a Savitz-golay filter is used for carrying out second-order differential processing on dynamic stiffness to capture a stiffness second-order derivative mutation point, and the critical moment when defensive contraction pain occurs to the joint of a patient is recognized. The maximum activity angle upper limit is dynamically reconstructed based on the critical angle and the safety buffering difference value, a control instruction is directly fed back to a driving end to execute reverse braking, crossing from single-position monitoring to multi-dimensional mechanical state sensing is achieved, it is ensured that the activity boundary is automatically adjusted according to real-time physiological feedback of a patient, and the safety performance of the patient is improved. And secondary injury caused by forcibly breaking through a pain threshold value is prevented.

The invention relates to the technical field of data processing, in particular to a structure dynamic stiffness analysis method based on frequency response function polycondensation substructure impedance coupling, which comprises the following steps: acquiring node information, unit connection relation and material attribute based on a global finite element model; defining a focus point set, a boundary point set and an internal point set according to the unit connection relationship; partitioning the global quality matrix, the stiffness matrix and the damping matrix to obtain a partitioned system matrix; introducing an inertia compensation term to construct a transformation matrix based on the block system matrix and the highest analysis frequency of the system, condensing the system matrix until only the freedom degrees of a concern set and a boundary point set are reserved, and calculating a dynamic stiffness matrix in a frequency domain; a dynamic stiffness result of a focus set is extracted through inverse operation of a dynamic stiffness matrix, the calculation scale is remarkably reduced through system matrix condensation, meanwhile, the inertia effect and the stiffness coupling effect of a far-field structure are strictly reserved, and the contradiction between low calculation efficiency of a global model and precision distortion of a local substructure method is effectively solved.

The invention discloses a digital twinning full life cycle management method and system based on machining, and belongs to the technical field of digital twinning in intelligent manufacturing, and the method comprises the steps: 1, obtaining a vibration spectrum of equipment, converting the vibration spectrum into a time sequence waveform, and constructing a multi-scale waveform database; 2, calculating a dynamic stiffness coefficient and a damping ratio based on the multi-scale waveform database, and generating a behavior feature vector; 3, constructing a local correction engine, detecting whether the behavior feature vector deviates from a preset reference threshold value, triggering local grid reconstruction of the digital twin model when the behavior feature vector deviates from the preset reference threshold value, and adjusting model parameters; 4, constructing a virtual load simulator, simulating equipment response based on the adjusted model parameters, and comparing the simulation response with the time sequence waveform; dynamic self-adaptive adjustment of the parameters of the digital twin model can be realized, the mapping precision of the digital twin model to the nonlinear and multivariable coupling state of the equipment is improved, and the timeliness and reliability of a prediction result are guaranteed.

This utility model discloses a suspension decoupling membrane structure for reducing dynamic stiffness, relating to the field of automotive suspension technology. The device includes a diaphragm body located within a flow channel decoupling membrane groove. The diaphragm body has several first buffer ribs evenly distributed along its length on its upper and lower surfaces. Between adjacent first buffer ribs, several second buffer ribs are evenly distributed along their width on the diaphragm body, with the length direction of the second buffer ribs perpendicular to that of the first buffer ribs. The sides of the first and second buffer ribs away from the diaphragm body respectively abut against the top cover plate and the bottom of the flow channel decoupling membrane groove. This utility model enables the suspension decoupling membrane to maintain low dynamic stiffness not only under high-frequency micro-amplitude vibrations but also to provide a large damping angle under low-frequency large-amplitude vibrations, thereby effectively suppressing abnormal noises and improving in-vehicle quietness.

The invention discloses a high-speed heavy-load working condition bearing dynamic stiffness testing device and testing method, and relates to the field of bearing testing. The invention solves the problems that the existing bearing dynamic stiffness test technology and equipment only can load in a single direction, cannot simulate axial and radial composite loading, depends on contact transmission, is insufficient in heavy load bearing, lacks system vibration error suppression measures, and is poor in reliability. And the high-precision test requirement of the independent rolling bearing under the high-speed heavy-load composite working condition is difficult to meet. A shafting supporting module is arranged on the upper portion of a test bench support, a measuring module is located over the shafting supporting module, an axial loading module and a radial loading module apply axial force and radial force to a tested bearing respectively, and a driving module drives a supporting shaft and an inner ring of the tested bearing to rotate. Axial and radial composite loading under the high-speed heavy-load working condition can be achieved, axial and radial displacement can be monitored synchronously, system errors are reduced, and high-precision measurement of the dynamic stiffness of the bearing is achieved.

The invention relates to the field of design and manufacturing of numerical control machine tools, and discloses a method for determining four-point main support positions of a horizontal machining center lathe bed, which comprises the following steps of: firstly, constructing an alternative position set according to the structural characteristics of the bottom surface of the lathe bed, and dividing the alternative position set into a stand column working area subset and a turntable working area subset based on a gravity center projection constraint principle; then establishing a multi-working-condition complete machine finite element model containing different position combinations of the moving part, and designing a test scheme by using an orthogonal table; in the simulation process, the bearing rigidity is dynamically updated by adopting an iterative correction mechanism based on a bearing reaction power function relation for each group of tests, and the response of the whole machine is solved and obtained; on the basis, a comprehensive evaluation index fusing the flatness and the inherent frequency of the guide rail is constructed; and finally, determining an optimal horizontal combination as four main support positions through index mean value analysis. According to the method, the influence of non-linear contact rigidity and gravity center drifting of the whole machine is fully considered, and the static precision retentivity and the dynamic rigidity characteristic of the whole machine are effectively improved.

The invention discloses an oil-immersed transformer vibration noise rapid simulation method based on multipath coupling and dynamic stiffness correction. The method comprises the following steps: step 1, shell unit FEM modeling and winding vibration calculation; 2, oil tank vibration calculation considering fluid and structure coupling; step 3, noise calculation; according to the method, by optimizing an electromagnetic force loading strategy, a modal screening mechanism and dynamic stiffness modeling, the calculation efficiency and prediction precision are remarkably improved, and efficient and reliable technical support is provided for transformer noise control and structure optimization design in scenes such as a hydropower station and a transformer substation.

This invention relates to the field of wind tunnel aerodynamic measurement technology for hypersonic vehicles, and discloses a method for evaluating and optimizing the dynamic load testing accuracy of a wind tunnel force measurement system. The evaluation method involves: equating the force measurement system to a multi-degree-of-freedom spring and mass model; constructing a dynamic differential equation and performing a Laplace transform; then, combining the dynamic stiffness matrix to construct a frequency response function matrix; defining the output of the force measurement channel of a rod-type strain balance and solving for the transfer function from the excitation point to the force measurement channel; combining the reference transfer function and the actual load, calculating the identified load and performing a Fourier transform to obtain the relative identification error of the force measurement system at the excitation point; finally, calculating the power spectrum weighted average identification error at the excitation point and comparing it with the engineering allowable error to determine whether the system has undergone stiffness optimization. This invention not only accurately identifies the dynamic load of the force measurement system but also achieves stiffness optimization, improving the accuracy of unsteady aerodynamic force measurement.

The application discloses a composite bushing, an automobile suspension and an automobile. The composite bushing comprises a hydraulic bushing with main spring rubber and a buffer bushing. The buffer bushing has an elastic buffer layer, which is sleeved on the outer periphery of the hydraulic bushing along the axial direction of the hydraulic bushing and surrounds the main spring rubber. The hardness of the elastic buffer layer is less than that of the main spring rubber, and the elastic buffer layer is used to produce elastic deformation at least when the composite bushing is subjected to at least one of radial load, torsional load and yaw load. By sleeving the buffer bushing with small dynamic stiffness on the outside of the hydraulic bushing, a composite structure with stiffness decoupling is formed. The buffer bushing is used to absorb part of high-frequency small-amplitude radial vibration by virtue of the small dynamic stiffness, and the hydraulic bushing is used to absorb low-frequency large-amplitude vibration.

The invention provides an intermediate optimization method and system for optimal machining performance of a multi-groove-cavity part, and the method comprises the steps: taking a feature relative density as a modeling parameter, and representing the allowance distribution state of a three-dimensional part in a two-dimensional space through constructing a feature relative density matrix; establishing a target function by taking the relative density of each groove cavity feature as an optimization variable and taking the minimum total flexibility of groove cavity connection nodes as an optimization target, and constructing an intermediate optimization model; the method comprises the following steps: initializing a feature relative density matrix, iteratively updating the feature relative density value of each groove cavity, and finally outputting an optimized feature relative density matrix, thereby determining the allowance distribution and processing sequence of each groove cavity. By optimizing the allowance distribution of the intermediate, the dynamic rigidity and stability of the workpiece subsystem in the machining process are remarkably improved, and larger cutting parameters are allowed to be adopted (the efficiency is improved) or a more stable cutting process is allowed to be obtained (the quality is improved).

This invention relates to the field of vibration control technology for civil engineering structures. It discloses a triaxial magnetorheological quasi-zero stiffness intelligent vibration isolation bearing for large-span spatial structures and its control method. The bearing includes a top plate and a bottom plate. A middle plate is fixed to the bottom of the horizontally stacked magnetorheological elastomer vibration isolation / vibration unit. A vertical magnetorheological quasi-zero stiffness vibration isolation / vibration unit is fixed to the bottom plate and slidably connected to the inner side of the middle plate. The control method uses sensors to collect the structural response in real time, identifying three operating conditions: high-frequency micro-vibration, low-frequency moderate vibration, and large earthquake safety. It automatically switches control modes to achieve coordinated adaptive control of vertical damping and horizontal stiffness and damping. This invention combines high static load-bearing capacity with low dynamic stiffness, enabling triaxial decoupling and multi-mode intelligent coordinated control, and is suitable for broadband vibration control of roof supports for large-span spatial structures.

This invention belongs to the field of material mechanical property testing and discloses a device for testing the friction loss of prestressed steel strands. It includes a prestressed concrete component and its internal corrugated pipe ducts, steel strands, a through-hole hydraulic jack, a tool anchor, an anchorage at the anchoring end, a tension sensor, a displacement sensor, a hardware clock synchronizer, a parameter input module, an embedded identification computing host, and a display and early warning terminal. The embedded identification computing host incorporates a dynamic stiffness extraction module and a dynamic stiffness identification module. The former extracts the measured dynamic stiffness curve from synchronously acquired tension force and elongation data, while the latter uses the measured final elongation as a static constraint and the measured dynamic stiffness curve as a dynamic constraint to jointly solve for the duct friction coefficient and deviation coefficient, reconstructing the axial force distribution and friction loss rate distribution along the entire length of the steel strand. This invention utilizes dynamic data from the entire tensioning process to replace traditional single-point steady-state data, achieving unique separation of the two parameters through double-layer constraints, significantly improving identification accuracy.

The application discloses a six-axis five-linkage gantry machining center precision stiffness forward design method and belongs to the technical field of machine tool equipment design and manufacturing. The method aims at the problems of large multi-process clamping error, high stiffness and precision prediction deviation of heavy-load machining centers, and unbalanced cost of tolerance distribution for large-size components such as liquid rocket composite cabin sections. First, the overall structure is completed based on the machining requirements of the composite thin-walled cabin section, the inner support cabin section and the fairing rear cone section. Then, the feature static stiffness modeling, the joint surface fractal dynamic stiffness matching and the tolerance-cost multi-objective precision distribution design are carried out in parallel. Finally, the overall scheme is output. The overall stiffness and precision prediction error is controlled within 8% by the method, the composite component IT9-level machining requirements are met, and the research and development cycle is effectively shortened and the production cost is reduced.

The invention belongs to the field of mechanical engineering, and particularly relates to a method for calculating the dynamic stiffness of a new energy reducer shell bearing seat. The method aims to solve the problem of low dynamic stiffness prediction precision caused by neglecting manufacturing residual stress and multi-physics field coupling effect in traditional simulation. A refined finite element model containing a high-density mixed grid and material nonlinear characteristics is constructed, a die-casting residual stress field based on neural network prediction is integrated, multi-source dynamic loads such as gear alternating torque, electromagnetic pulse power and road surface excitation are coupled, nonlinear transient dynamics solution is executed, and a die-casting residual stress field is obtained. And obtaining time domain response data of the bearing seat node. In addition, a process-structure-performance database and a rapid prediction model are established, lightweight design closed-loop optimization and digital twinning online monitoring are supported, simulation accuracy and engineering application efficiency are improved, and the method is suitable for dynamic performance analysis and service life management of the new energy automobile speed reducer.

The application relates to a robot milling semi-active vibration suppression end effector and a control method based on an MRF-MRE hybrid medium, which comprises a hybrid medium system constructed in parallel with a magneto-rheological fluid and a magneto-rheological elastomer, controllable energy dissipation damping provided by the MRF filled in a shearing gap, variable dynamic stiffness provided by the MRE as a supporting element, tracking adjustment of an inherent frequency and independent suppression of a vibration amplitude realized through differential or common-mode magnetic fields generated by double excitation coils, and a heat-magnetic compensation mechanism based on impedance monitoring of the excitation coils, which effectively solves the performance drift problem in long-time machining. The end effector adopts a non-rotating design, the mover assembly is radially vibrated with the cutter but not rotated with the cutter through the antifriction bushing, and the reliability and sealing life in the high-speed milling working condition are remarkably improved.

The embodiment of the invention provides a vehicle structure adjusting method, a vehicle, a storage medium and a program product. The method comprises the steps that a mounting point dynamic stiffness curve and a structure weak area of a vehicle structure are obtained; based on the dynamic stiffness valley value of the mounting point dynamic stiffness curve and the region parameter of the structure weak region, constructing an adjustment parameter of a vehicle structure and a topological parameter of a topological entity; and adjusting the vehicle structure based on the adjustment parameter, and adding a topological entity on the vehicle structure based on the topological parameter. The technical problem that in the prior art, the adjusting efficiency of the vehicle structure is low is solved.

The invention discloses an engine elastic support residual life prediction method based on a random forest model, and belongs to the technical field of mechanical part life prediction. The method comprises the following steps: collecting vibration acceleration and displacement signals of the elastic support in the whole life cycle through a vibration test bench; selecting characteristic parameters including an effective value, an inherent frequency, a damping ratio and dynamic stiffness based on a failure mechanism; key features are screened through principal component analysis and Pearson correlation coefficients; a random forest regression model is constructed, and the model precision is improved in combination with parameter optimization and cross validation; and finally, inputting the screened characteristic parameters, and outputting a residual life prediction value. The method realizes accurate prediction of the residual life of the rubber-metal composite elastic support member, has the advantages of strong anti-noise capability, good generalization performance and comprehensive evaluation indexes, and is suitable for state monitoring and preventive maintenance in engineering practice.

The application discloses a kind of water-lubricated bearing dynamic stiffness and damping coefficient calculation method, comprising the following steps: first, based on the contact interface topography characteristics of water-lubricated bearing under mixed lubrication state, the calculation of water-lubricated bearing dynamic stiffness and damping coefficient is divided into water film bearing area dynamic stiffness and damping coefficient, micro asperity contact area dynamic stiffness and damping coefficient two parts, then parallel equivalent water film bearing area dynamic stiffness and damping coefficient, micro asperity contact area dynamic stiffness and damping coefficient, obtain water-lubricated bearing overall dynamic contact stiffness and damping coefficient.The application can calculate the dynamic characteristics of water-lubricated bearing under any working condition, fill the blank of overall dynamic characteristics calculation under the existing water-lubricated bearing mixed lubrication state.

The invention relates to the technical field of precision machining control, and discloses a rolling body precision turning precision error compensation control system, which comprises a multi-source heterogeneous sensing module used for collecting various signals; the dynamic stiffness modeling module is used for constructing a circumferential dynamic stiffness distribution model distributed in the circumferential direction of the workpiece; the angle domain phase coupling module is used for outputting a comprehensive feature vector containing the rigidity modulation deformation and the equivalent main shaft geometric error; the error prediction module is used for predicting and outputting a roundness error prediction value of the next angle step length; and the compensation execution module is used for dynamically superposing the position compensation instruction into an original interpolation instruction of the numerical control system and driving a servo shaft to execute displacement compensation. According to the method, by constructing the circumferential dynamic stiffness model and applying angle domain phase coupling, precise calculation of sensor data space-time alignment and cutting point elastic deformation is achieved, and the real-time prediction precision and the compensation effect of the rolling body turning roundness error are improved.

The application discloses an ultra-low frequency quasi-zero stiffness vibration isolator and a debugging method, and the vibration isolator comprises a fixed plate, a stiffness adjusting mechanism and a dynamic mechanism; the fixed plate is connected with the stiffness adjusting mechanism through a support seat; the stiffness adjusting mechanism is connected with the dynamic mechanism through bolts; the stiffness adjusting mechanism is connected with the dynamic mechanism through first inclined rods, second inclined rods, horizontal tension spring units and vertical tension spring units to form an X-shaped full-tension spring frame body, so that the dynamic stiffness of the whole vibration isolator reaches a quasi-zero stiffness state; the horizontal tension spring units are respectively connected with the first inclined rods and the second inclined rods through first bearing pieces; the first inclined rods are hingedly connected with the dynamic mechanism through second bearing pieces; the second inclined rods are connected with the dynamic mechanism through second bearing pieces; one end of the vertical tension spring unit is connected with the horizontal tension spring unit, and the other end of the vertical tension spring unit is connected with the fixed plate; in the case of paying attention to frequency vibration noise below dozens of Hz, the application has the characteristics of high static stiffness and low dynamic stiffness in the system stiffness.

The application discloses a kind of prediction methods of building three-dimensional vibration response, comprising the following steps: step one, the dynamic stiffness matrix of the column, beam, floor and shear wall four components in the frame-shear wall structure of building is obtained, according to spatial geometric coordinate relationship is assembled, obtains the dynamic stiffness matrix [D] of building G ;Step two, according to external force load vector [F] G And the dynamic stiffness matrix [D] G Of building, the displacement response vector [X] G Of building is obtained;Step three, according to the displacement response vector [X] G Of building obtained, according to building displacement response, the strategy of installing damping support in the bottom of building is used to carry out damping. According to the technical scheme provided by the application, the strategy of installing damping support in the bottom of building can be used to carry out damping according to building displacement response.

The present application belongs to the technical field of structure vibration isolation and reduction, and particularly relates to a vertical quasi-zero stiffness limiting vibration isolation device with adjustable load. The device comprises a bearing plate, an upper limiting plate, a lower limiting plate, a positive stiffness mechanism, a negative stiffness mechanism, a connecting rod and an adjusting support part. The positive stiffness mechanism is arranged between the bearing plate and the upper limiting plate, and the negative stiffness mechanism and the adjusting support part are arranged between the upper limiting plate and the lower limiting plate. The adjusting support part comprises four supporting cylinders and eight round-hole sliders. The connecting rod connects the positive stiffness mechanism and the negative stiffness mechanism, and a central connecting block is arranged on the connecting rod. One end of the negative stiffness mechanism is connected with the central connecting block, and the other end is connected with a round-hole slider. By adjusting the pre-compression coefficient of the inclined elastic element of the negative stiffness mechanism, the stroke of the round-hole slider and the position of the central connecting block on the connecting rod, the quasi-zero stiffness characteristic is maintained at the initial static force balance position, and the nonlinear vibration isolation effect of high static stiffness and low dynamic stiffness is realized.

The invention relates to the technical field of data analysis, and discloses a bonding silver wire ultrasonic welding signal-based process optimization method and system, and the method comprises the steps: extracting a bonding silver wire ultrasonic welding signal which comprises an ultrasonic amplitude signal, a welding pressure signal, a transducer current signal and a welding spot deformation image sequence; analyzing the energy entropy characteristics of the bonded silver wire, and analyzing the dynamic stiffness coefficient of the bonded silver wire; establishing a nonlinear impedance model of the bonding silver wire by using a transducer current signal so as to analyze the energy loss rate of the bonding silver wire and analyze the welding spot microscopic deformation gradient of the bonding silver wire; analyzing a welding spot failure coefficient and an optimization constraint condition of the bonding silver wire; and optimizing the process parameters of the bonding silver wire to obtain optimized process parameters, and performing process optimization of the bonding silver wire based on the optimized process parameters. According to the invention, the process optimization effect of bonding the silver wire can be improved.

A kind of soft rock roadway active and passive integrated support method and system based on dynamic stiffness regulation belongs to intelligent support technical field, method: after tunneling, high-strength anchor rod / anchor cable is formed pressure stress zone according to design pre-tightening force, and flexible protective surface is formed by spraying fiber concrete;When deformation rate meets criterion, install constant resistance pressure relief device to actively reduce stiffness, while grouting and reinforcing broken zone;After deformation rate continues to decline, erect collapsible U-shaped steel support and wall backfilling, and form collaborative bearing ring with anchoring-grouting reinforcement ring;After evaluating that safety factor meets requirements, overall cast reinforced concrete lining;System: data perception module includes laser converging instrument, multipoint displacement meter, pressure sensor and strain gauge;Analysis decision module includes stage identification unit, key parameter calculation unit and decision instruction output unit;Support execution subsystem includes first, second, third and fourth stage execution components.The present application can significantly improve the quality controllability and reliability of support engineering.

The application discloses a torsional negative stiffness vibration isolation device based on pre-tensioned springs and belongs to the technical field of vibration isolation devices.The vibration isolation device can normally transmit the rated torsional motion of a system, reduces the torsional dynamic stiffness of the system, lowers the natural frequency, realizes the torsional vibration isolation of shaft system components under low-frequency and ultralow-frequency bands, and has a good vibration isolation effect.Two ends of two connecting rod devices are connected in a hinged manner on an inner part and corresponding sliding blocks respectively, the two sliding blocks are limited in displacement directions through sliding grooves fixed on the inner side of an outer part, and elastic elements generate acting forces on the two sliding blocks and apply torsional moments on the inner part through the two connecting rod devices.The application introduces a negative stiffness device, reduces the torsional dynamic stiffness of a shaft system structure, lowers the natural frequency of the system in the torsional direction, and realizes the vibration isolation function under low-frequency and ultralow-frequency bands.

The application discloses a compliant variable stiffness curved beam supporting ultra-low frequency vibration isolation device, which comprises a main frame, a main connecting rod movably arranged in the main frame, and a negative stiffness mechanism and a positive stiffness mechanism coupled in parallel to the main connecting rod, wherein the negative stiffness mechanism with nonlinear negative stiffness is sleeved on the main connecting rod, the positive stiffness mechanism with nonlinear positive stiffness is fixed at one end on the main frame and is fixedly connected at the other end with the main connecting rod, the nonlinear positive stiffness mechanism is used for modulating the nonlinear negative stiffness mechanism, and the high static stiffness and low dynamic stiffness characteristics are realized. The application adopts the arc-shaped beam with double-end clamping to provide the nonlinear negative stiffness, adopts the spiral-shaped beam to provide the nonlinear positive stiffness and the guiding function, and adopts the parallel arc-shaped beam and spiral-shaped beam to realize the high static stiffness and low dynamic stiffness characteristics. The stiffness of the vibration isolation device only needs to be modulated by adjusting the coupling connection relationship of the positive stiffness mechanism and the negative stiffness mechanism, the configuration parameters of the elastic elements do not need to be changed or the elements do not need to be replaced, the stiffness modulation is flexible, and the ultra-low dynamic stiffness can be easily realized. The vibration isolation device adopts the compliant design, is convenient to assemble, has no motion gap and contact friction limitation, and can realize the ultra-low frequency vibration isolation.

The utility model discloses a load-bearing deformation-resistant FFU box body bottom plate reinforcing structure which comprises a main load-bearing plate, airflow guide plates are arranged at the left end and the right end of the main load-bearing plate, auxiliary supporting plates are arranged at the front end and the rear end of the main load-bearing plate, and right-angle folded edges are arranged at the connecting positions of the auxiliary supporting plates and the main load-bearing plate. A honeycomb laminate is arranged at the lower end position of the main bearing plate, the honeycomb laminate is connected with the main bearing plate through an adhesive at the upper end position, and a core body wall is arranged at the inner position of the honeycomb laminate. Dynamic stiffness compensation is achieved, a bidirectional enhancement effect is formed through the coupling effect of reinforcing ribs in specific geometrical shapes and an airflow channel, a vibration suppression mechanism is established, a mechanical impedance sudden change area is arranged on the structural level, and a propagation path of vibration waves is blocked.