47 results about "Bearing stiffness" patented technology

The invention relates to the technical field of mechanical transmission, in particular to a reinforcement learning compensation method and system for gear multi-body dynamics constraint, and the method comprises the steps: building a multi-body dynamics digital twinborn model containing bearing rigidity and gear meshing force; constructing an adaptive reward function based on nonlinear manifold mapping, and dividing a system state space into a small deviation domain and a large deviation domain according to an angle deviation threshold value; training the multi-body dynamic model based on a depth deterministic strategy gradient algorithm to obtain a compensation strategy; the obtained compensation strategy is applied to a multi-body dynamic model, and an optimal compensation signal is obtained through self-adaptive fusion of static compensation and dynamic compensation, so that the training efficiency of a reinforcement learning algorithm in a complex nonlinear system is improved, the adaptability of the system to working condition changes is enhanced, the vibration of a gear system is remarkably reduced, and the reliability of the system is improved. The angle control precision is improved, and the service life of equipment is prolonged.

The application discloses a kind of centrifugal pump shafting critical speed calculation method, including the finite element calculation of radial roller bearing and thrust roller bearing stiffness coefficient curve, the prestressed modal analysis and critical speed calculation of centrifugal pump shafting considering different bearing stiffness coefficient.The setting of constraint condition of this method is in line with actual situation, which can realize the accurate calculation of centrifugal pump shafting critical speed, and help to improve the reliability of safety check of centrifugal pump shafting in design stage, at the same time, the calculation steps are simple, and the engineering application range is wide.

To provide a dynamic pressure bearing excellent in bearing rigidity at low cost.SOLUTION: A dynamic pressure generating part P is provided on each of two radial bearings A1, A2 provided at an interval in the axial direction, and a large diameter cylindrical surface 8b having a diameter larger than that of the radial bearings A1, A2 is provided between the radial bearings LA, LA. In the dynamic pressure bearing (bearing member 8) in which the dynamic pressure generating portion P is formed of a concavo-convex surface in which a plurality of dynamic pressure grooves 10 extending in the axial direction and convex hill portions 11 are alternately arranged in the circumferential direction, one radial bearing surface A1 and the large-diameter cylindrical surface 8b are connected via a tapered surface 8c inclined with respect to the axial direction, and the other radial bearing surface A2 and the large-diameter cylindrical surface 8b are connected via a tapered surface 8d having an inclination angle with respect to the axial direction smaller than that of the tapered surface 8b. The dynamic pressure grooves 10 formed in the A2 of the other radial surface are open to the 8d of the tapered surface.SELECTED DRAWING: Figure 4

The embodiment of the present application provides a bearing stiffness detection method, device and storage medium, the method comprising: obtaining the force exerted on each bearing shell on the bearing during the target motion cycle; determining the vector trajectory of the resultant bearing force during the target motion cycle based on the force, and performing vector decomposition on the vector trajectory to obtain the load at each sampling moment; obtaining the motion trajectory of the axis relative to the origin during the target motion cycle, and performing vector decomposition on the motion trajectory to obtain the motion components at each sampling moment; obtaining the bearing stiffness at each sampling moment during the target motion cycle based on the load and motion components. In the embodiment of the present application, the motion trajectory is obtained by a distance sensor group and the vector trajectory is obtained by a force sensor, and the bearing stiffness is then calculated based on the two trajectories, which can ensure the accuracy of the bearing stiffness detection.

This invention belongs to the field of air bearing technology and discloses a tilting pad air foil bearing with coordinated control of PZT and a bridge amplification mechanism. It includes a top foil, a corrugated foil sleeved outside the top foil, a bushing sleeve sleeved outside the corrugated foil, a through groove on the bushing, a PZT placed within the through groove, a bridge amplification mechanism connected to the PZT, and the bridge amplification mechanism connected to the tilting pad via a flexible hinge. The tilting pad contacts the corrugated foil, the PZT is connected to a power supply device, and the power supply device is connected to a controller. The advantages of this invention include oil-free lubrication, low friction loss, high rotational speed, adjustable bearing clearance, and adjustable bearing stiffness.

The invention relates to the field of nuclear main pump testing, in particular to a method and a device for testing rigidity and damping of a turbine guide bearing of rotating machinery of a nuclear power plant. According to the method, cold-state gap measurement, static measurement and hot gap measurement are carried out; performing dynamic measurement; based on parameters measured by the sensor, the rigidity and damping of the water lubricated bearing are solved through a rotor dynamic balance equation; constructing a liquid film fluid calculation model of the experiment table water guide bearing, substituting the measured pressure data into the calculation model to obtain axial and circumferential pressure distribution curves of a liquid film of a cylinder of the water guide bearing, and obtaining liquid film forces of the water guide bearing in different states; and comparing the rigidity and damping obtained by the dynamic balance equation of the rotor with the rigidity and damping obtained by the calculation model, eliminating the rigidity and damping with the deviation greater than 5% between the two methods under the same working condition, and averaging the residual values to obtain the final damping and rigidity. The method is high in measurement precision and convenient in measurement.

The application relates to an in-plane arbitrary direction quasi-zero stiffness vibration isolator, belonging to the field of vibration isolators, which comprises a mounting frame, an installation space is formed on the inner side of the mounting frame, and a vibration isolation mechanism is installed in the installation space; the vibration isolation mechanism comprises a support base, a plurality of connecting arms are arranged on the outer side wall of the support base, the connecting arms are located in the same horizontal plane and are arranged in the direction away from the support base, the connecting arms are uniformly arranged around the support base, and a connecting base is hinged to the end of the connecting arm away from the support base; the vibration isolation mechanism further comprises a plurality of mounting bases which are one-to-one correspondingly arranged with the connecting bases, the mounting bases are located on the side, away from the connecting arms, of the connecting bases, and the mounting bases are hinged to the mounting frame; the connecting base is connected with the mounting base through a quasi-zero stiffness component, and the quasi-zero stiffness component is pre-compressed and in a quasi-zero stiffness state. The application can isolate the vibration in any direction in the horizontal direction from the isolated object, and has good bearing stiffness.

The present invention relates to the design, optimization and application of a reinforcement or reinforcements produced by additive manufacturing to increase the bending, torsional and load-bearing stiffness of sheet metal components.

The invention discloses a non-coplanar multi-guide-rail error homogenization mechanism research test platform which comprises a base, a cross beam, a rolling linear guide rail pair, a sliding block, a ball screw, a servo motor, a sliding plate and the like. In the invention, the test bench is driven by the servo motor to drive the ball screw to rotate, and the ball screw drives the sliding plate, namely the workbench to move left and right on the guide rail along the guide rail, so that the processing process is realized. The device provided by the invention meets the experimental research of error homogenization, and has the innovation point that the non-coplanar multiple guide rails are symmetrically arranged up and down, so that the error homogenization mechanism test of the machine tool is met. Through the working stroke of left and right feeding of the workbench, the test bench can be used for testing geometric assembly errors on a numerical control machine tool, assembly errors of a lead screw, rigidity of a sliding block, rigidity of a bearing and the like, meets error homogenization mechanism tests, and is worthy of popularization and application.

The invention discloses a bearing rigidity indirect measurement method and system based on system error compensation, and the method comprises the following steps: installing a standard sample block in a test system, applying an axial load, measuring a first deformation amount of the standard sample block under each stage of load, and recording the first deformation amount as a system deformation amount; installing a measured bearing, applying axial loads of all levels which are the same as the axial loads of the step S1, measuring a second deformation amount of the measured bearing, and recording the second deformation amount as a total deformation amount; according to the obtained total deformation amount and the system deformation amount, calculating the real deformation amount of the measured bearing under each level of load; and determining a load-deformation function relationship based on a corresponding relationship between each stage of axial load and the real deformation amount, and obtaining the rigidity of the measured bearing. Compared with the prior art, the standard sample block is introduced for comparison testing, a system error compensation mechanism is innovatively provided, errors caused by self deformation of a testing system can be accurately eliminated, the real deformation amount of the bearing is obtained, the rigidity measurement precision is greatly improved, and the method is particularly suitable for accurate calibration of the high-rigidity bearing.

This invention provides an adjustable stiffness foil gas dynamic pressure bearing, comprising: a top foil, a first foil, an SMA foil group, a second foil, a bearing sleeve, a cooling plate, and a heat sink; wherein, the first foil and the second foil are each composed of two longitudinal beams connected at the ends of circumferentially distributed V-shaped beams, the circumferential length of the V-shaped beam of the first foil is less than the gap between two adjacent V-shaped beams of the second foil, and the V-shaped beam of the first foil is placed between the two V-shaped beams of the second foil; the SMA foil group is composed of a first SMA foil, an electrically controlled heating film, and a second SMA foil stacked sequentially, located in the middle of the first foil and the second foil, and its axial width is less than the axial width of the V-shaped beams of the first foil and the second foil; the cold end of the electrically controlled cooling plate is in close contact with the V-shaped beam of the second foil, and the hot end is connected to the heat sink; the top foil provides the bearing surface for the dynamic pressure gas film, and the bearing sleeve supports and fixes all components. This application achieves active adjustment of bearing stiffness by rapidly adjusting the elastic modulus of SMA foil through an electrically controlled heating film and cooling plate, thus solving the technical problem that existing foil gas dynamic bearings cannot cross critical speeds and ultra-high speed instability. The circumferentially spaced V-shaped beams enable the top foil and SMA foil group to participate in structural deformation as simply supported beams, improving impact resistance and durability. Under load, the top foil forms a V-shaped depression, producing a gas-gathering effect similar to that of grooved bearings, thereby improving the bearing's load-bearing capacity.

This invention discloses a semi-analytical method and system for calculating the stiffness and damping coefficients of foil gas dynamic bearings, relating to the field of air conditioning and clothing temperature control technology. It aims to address the shortcomings of traditional Reynolds equation methods in terms of accuracy and universality, as well as the low computational efficiency and mesh distortion issues of existing CFD methods. The method includes: constructing a fluid-structure interaction (FSI) computational model to calculate and obtain the static equilibrium position of the journal; applying an eccentricity perturbation at the static equilibrium position and performing an additional steady-state FSI calculation to obtain the four stiffness coefficients of the foil bearing using a first set of analytical formulas; applying small-amplitude simple harmonic vibrations along the x and y directions to the journal and performing two transient FSI calculations to obtain the four damping coefficients of the foil bearing using a second set of analytical formulas. This invention combines high accuracy and high computational efficiency, providing an efficient and reliable analytical tool for evaluating the dynamic characteristics of foil bearings and designing the stability of the rotor systems they support.

The invention provides a nonlinear vibration coupling analysis method for an aerostatic spindle under sliding mode control, and relates to the technical field of machine tool precision machining. A multi-degree-of-freedom system dynamics model is constructed by performing nonlinear coupling calculation on gas film force, unbalanced magnetic pulling force and mass eccentric excitation. Time-varying nonlinearity of bearing rigidity is accurately described through calculation of dynamic air film force, the two-way coupling effect between an electromagnetic field and mechanical motion is revealed through introduction of unbalanced magnetic pulling force, and complex combined frequency vibration can be generated through interaction of mass eccentricity serving as classical external synchronous excitation and the two kinds of internal excitation. According to the method, the controller design can consider and compensate the nonlinear time variation of the gas film force, the state dependence disturbance of the magnetic pulling force and the eccentric force excitation in advance, the reverse influence of the control action on the gas film stability and the electromagnetic field can be evaluated, and the real mechanical-electric-gas-control collaborative optimization is realized.

The invention discloses a vertical bearing seat capable of quickly adjusting bearing pre-tightening force, and relates to the technical field of bearing seats. When a main shaft bearing seat is used, pretightening force needs to be adjusted through a test so as to adjust the relation between the rigidity of a bearing and the temperature of the bearing, a method for replacing a pretightening elastic element is usually adopted for adjusting the pretightening force, and the process is time-consuming and labor-consuming. In order to solve the problem that the elastic pre-tightening force of a bearing cannot be quickly adjusted when the bearing seat is used, a power transmission rotating structure, a lubricating oil supply and return passage and a pre-tightening force adjusting structure are designed and invented, and the bearing seat applying the structure solves the problems that a shaft system needs to be disassembled and an elastic element needs to be replaced when the pre-tightening force of the bearing is adjusted. The invention is suitable for the technical field of bearing pedestals.

The present application relates to the technical field of bearing detection, in particular to a kind of hub bearing rigidity test tool based on real vehicle steering knuckle, including tooling table, it is equipped with tooling assembly on it, it further includes loading flange plate, universal joint, it is arranged in the center of the loading flange plate, axial loading rod, it is along the axial direction of the loading flange plate and is arranged, radial loading rod, it is along the radial direction of the loading flange plate and is arranged, vertical slide rail and horizontal slide rail, the vertical slide rail is fixed to the tooling table, the vertical slide rail is slidably provided with sliding frame for installing the axial loading rod, the horizontal slide rail is fixed to the sliding frame, the radial loading rod is slidably arranged on the horizontal slide rail.The present application is rigidly fixed to tooling table by real vehicle steering knuckle, and is rigidly connected with hub bearing using loading flange plate, in combination with universal joint, so that axial load is stably transmitted and additional bending moment generated due to the inclination of flange plate can be released.

The invention belongs to the field of CARB bearing radial stiffness and elastohydrodynamic lubricating oil film stiffness, and discloses a stiffness calculation method applied to a full-complement CARB bearing of an icebreaker under a low-speed working condition, and the method comprises the steps: building a full-complement CARB bearing stiffness analysis model based on a structure of slice hierarchy-roller hierarchy-bearing hierarchy; and the rigidity of the full complement CARB bearing is solved by combining series coupling and parallel integration. According to the rigidity calculation method, the limitation that a traditional algorithm can only process ideal centering is broken through, the load unbalance loading effect and local oil film rigidity change of the bearing under the non-centering and heavy-load working conditions can be accurately quantified, therefore, the stress concentration risk of the roller edge is effectively recognized, refined modification of the roller convexity is guided, and the precision of the roller convexity is improved. And a nonlinear stiffness parameter conforming to a real physical state is provided for shafting dynamics simulation, and the reliability of bearing life prediction and structural design under a special working condition is remarkably improved.

The present invention discloses a device for testing the stiffness of an axial electromagnetic bearing. The device comprises a base, a sector guide block, a mounting plate, a tension sensor, and a cover plate. A thrust disc is fixedly mounted at the center of the upper surface of the base. The sector guide blocks are multiple, mounted on the base and arranged in a circular pattern around the thrust disc. A support is provided on one side of the sector guide block protruding toward the thrust disc. The mounting plate is placed above the thrust disc and supported by the support of the sector guide block. The axial magnetic bearing to be tested is fixedly mounted on the lower surface of the mounting plate. The mounting plate is vertically connected to the cover plate via the tension sensor, and the cover plate covers the multiple sector guide blocks. The device has simple component structures and is easy to install. It can accurately measure the stiffness parameters of the axial magnetic bearing.

The present application relates to air bearing test technical field, especially to a kind of air bearing stiffness testing device and method, including test table, air bearing installation mechanism, gas film gap adjusting mechanism, levelness adjusting mechanism and measurement system;Air bearing installation mechanism is invertedly installed on the top of test table, and gap detection assembly is provided on air bearing installation mechanism;Gas film gap adjusting mechanism is set in test table and is just for the below of air bearing installation mechanism;Levelness adjusting mechanism includes at least three flexible hinges, and flexible hinge is distributed between fixed seat and bearing platform in three-point support;Measurement system includes control unit, control unit is integrated with closed-loop control algorithm, and is connected with gap detection assembly, gas film gap adjusting mechanism communication respectively.The present application realizes micron gas film gap control by innovative gas film gap adjusting mode, levelness guarantee structure and air bearing installation mechanism inverted design, and significantly improves stiffness test precision.

This invention discloses an origami structure possessing both load-bearing and energy-absorbing properties, belonging to the field of buffer structure technology. The structure includes an outer sleeve and an inner sleeve. The inner sleeve is fixed to a top plate and a bottom plate at both ends, respectively. The outer sleeve is coaxially fitted with the inner sleeve, and its ends slide against the top and bottom plates, respectively. Both the outer and inner sleeves are origami tubes with pre-defined crease lines distributed circumferentially and axially on their surfaces. These crease lines form a periodic, inclined grid, allowing for regular torsional and folding deformation under axial compression. During the load-bearing stage, the crease directions of the outer and inner sleeves are staggered to provide axial load-bearing stiffness and bending stiffness. During the energy-absorbing stage, the outer and inner sleeves move relative to each other until their crease directions are aligned, allowing them to fold and deform along the creases to absorb impact energy. This structure integrates both load-bearing and buffering mechanical properties through the relative change in the crease directions of the inner and outer sleeves.

This invention proposes an automated testing line for multi-dimensional parameters of rolling bearings and a method for evaluating the grade of rolling bearings. The testing line includes a control system, a conveyor belt device connected to the control system, and a robotic arm device located outside the conveyor belt device. Along the length of the conveyor belt device are modules for testing rolling bearing stiffness, radial clearance, and vibration characteristics. By incorporating the conveyor belt device and robotic arm device, this invention can automatically detect parameters such as radial and axial support stiffness, radial clearance, and vibration characteristics of rolling bearings. In actual production, this invention can replace some single-function bearing performance testing devices, reducing or eliminating the need for manufacturers to construct additional rolling bearing testing and screening lines. This invention can promptly identify and screen out unqualified bearings, helping companies improve product quality and achieve the effects of reducing costs and increasing production efficiency.

The invention belongs to the technical field of ships, and particularly discloses a composite material reinforced closed section steel broadside sandwich structure and a preparation method thereof.The structure comprises a broadside sandwich plate, a first bulkhead sandwich plate, a second bulkhead sandwich plate and a third bulkhead sandwich plate which are sequentially connected from outside to inside; an inner partition plate is connected between the broadside sandwich plate and the first bulkhead sandwich plate, and an energy absorption void is defined by the inner partition plate and the first bulkhead sandwich plate. The first bulkhead sandwich plate and the second bulkhead sandwich plate are connected through a cross beam and define a liquid tank; a corrugated arc-shaped plate is connected between the second bulkhead sandwich plate and the third bulkhead sandwich plate, and the second bulkhead sandwich plate and the third bulkhead sandwich plate jointly enclose a buffer void; each sandwich plate comprises a steel skin and a closed-section profile, and the closed-section profile is filled or wrapped with a composite filler. According to the structure, impact energy is absorbed and dispersed layer by layer through rigid-flexible coupling gradient transition, local buckling is restrained, the impact energy absorption is improved by more than one time under the same surface density, and light weight, impact resistance and bearing rigidity are considered.

This invention relates to the field of mechanical transmission technology, and particularly to a reinforcement learning compensation method and system for gear multibody dynamics constraints. The method includes: establishing a multibody dynamics digital twin model incorporating bearing stiffness and gear meshing force; constructing an adaptive reward function based on nonlinear manifold mapping, dividing the system state space into small-deviation and large-deviation domains according to an angle deviation threshold; training the multibody dynamics model based on a deep deterministic policy gradient algorithm to obtain a compensation strategy; applying the obtained compensation strategy to the multibody dynamics model, and obtaining the optimal compensation signal through adaptive fusion of static and dynamic compensation. This improves the training efficiency of reinforcement learning algorithms in complex nonlinear systems, enhances the system's adaptability to changes in operating conditions, significantly reduces gear system vibration, improves angle control accuracy, and extends equipment service life.

The invention discloses a variable-rigidity flexible wing, and relates to the technical field of wing structures, the variable-rigidity flexible wing comprises a leading edge wing, a passive variable-rigidity structure and a trailing edge wing which are connected in sequence, the passive variable-rigidity structure is connected with the exterior of the trailing edge wing through a skin, and the passive variable-rigidity structure can swing up and down along with a wing chord to change the rigidity of the wing. In the wing deformation process, the wing chord can swing up and down through contact of the passive variable-rigidity structure to change the rigidity of the wing, and the local rigidity of the wing can be increased, so that it is ensured that the wing keeps enough bearing rigidity, and rigidity characteristic adjustment can be achieved when the rear edge of the wing bends upwards or downwards.

[Problem to be solved] To achieve an improvement in the layout flexibility for a drive unit while simultaneously ensuring the bearing stiffness of the drive unit. [Solution] An electric vehicle rear structure (100) comprises a rear floor panel (1) arranged above a drive unit (M), a pair of rear side elements (2, 2), several motor mounts (7), and an intermediate element (3) arranged between the pair of rear side elements (2, 2) and extending longitudinally along a lower surface of the rear floor panel (1). The rear floor panel (1) has an upper convex section (1a) that curves towards the top of the vehicle and a peripheral section (1b) that surrounds a perimeter of the upper convex section (1a). The intermediate element (3) is connected to a sidewall adjacent section (1b1) of the peripheral section (1b), the sidewall adjacent section (1b1) conforming to a sidewall (1a3) on one side of the upper convex section (1a) in the vehicle width direction. One target motor mount (7x) of the multiple motor mounts (7) is supported by the intermediate element (3).The drive unit (M) is located below the upper curved section (1a) and between a rear side element (2) of the paired rear side elements (2, 2) and the intermediate element (3) at the rear of the vehicle.

The present invention discloses a multi-stage air spring, comprising a cylinder body, a plurality of supporting rubber springs, a plurality of sealing rubber springs, and a piston: the present invention connects the piston and the cylinder body with supporting rubber springs and sealing rubber springs, the low shear stiffness of the rubber springs allows the piston to move freely axially relative to the cylinder body, playing the role of a flexible spring connection; the high radial pressure-bearing stiffness of the rubber springs can provide effective radial support for the piston, allowing the piston rod to withstand a large radial load, playing the role of a radial support bearing; the supporting rubber springs and the sealing rubber springs are connected together with the piston and the cylinder body to form a gapless sealing interface, which can effectively avoid leakage problems, greatly increase the compressed air pressure in the cylinder, and significantly improve the load-bearing capacity of the air spring; by connecting multiple air springs through the piston rod to form a parallel connection in terms of stiffness, the load-bearing capacity per unit cross-section is greatly improved in a smaller space.

The invention belongs to the technical field of mechanical engineering, and particularly relates to an elastic support rigidity calculation method and an elastic support integrated bearing rigidity calculation method. Based on the squirrel cage strip structure and the squirrel cage radius of the squirrel cage type elastic support, analyzing the stress of the squirrel cage, and establishing a stress analysis model of the squirrel cage type elastic support; based on a stress analysis model of the squirrel-cage type elastic support, the relationship between the rigidity of the squirrel-cage type elastic support and the structural parameters of the squirrel-cage type elastic support is derived, and the rigidity of the squirrel-cage type elastic support is calculated by using the relationship between the rigidity of the squirrel-cage type elastic support and the structural parameters of the squirrel-cage type elastic support. The structural parameters of the squirrel-cage type elastic support comprise the number of squirrel-cage strips, the height of the trapezoidal cross section of each squirrel-cage strip, the length of the long side of the trapezoidal cross section of each squirrel-cage strip, the radius of the squirrel-cage and the distance between the circle center of the squirrel-cage and the circle center of the cross section of each squirrel-cage strip, and the obtained squirrel-cage type elastic support is more accurate in rigidity.

The invention relates to the technical field of safety control of high-speed direct drive units, in particular to an active anti-surge system and method for a magnetic suspension air blower, and the active anti-surge system and method for the magnetic suspension air blower are characterized in that vibration energy within 0.2-0.8 times of rotor fundamental frequency is extracted as surge energy by collecting rotor vibration signals in real time and performing spectral analysis; the surge signal is compared with an early warning threshold value, and a surge mark is generated; once early warning is carried out, the bias current of the magnetic bearing is dynamically adjusted to improve the rigidity, and the emergency shutdown threshold values of vibration and displacement are synchronously lowered; and meanwhile, the difference value between the actual operation flow and the surge boundary flow is continuously monitored, and opening and closing of an emptying valve are controlled in a grading mode in combination with surge marks. The method comprises the following steps: capturing the impending surge characteristics in advance through vibration spectrum analysis; the anti-surge curve and the dynamic safety margin are fused, and magnetic bearing rigidity-damping cooperative adjustment is achieved; and in an emergency, a forced emptying hard safety loop is established, and a graded active protection system is formed.

The invention belongs to the field of bearing structural mechanics, and relates to a single-row tapered roller bearing statics calculation method and system taking shaft deformation influence into account. Through roller axial slicing treatment, a mapping relation between slice deformation and bearing overall displacement is established, and a bearing stiffness matrix is deduced according to a binding force balance condition; a bearing-shaft coupling statics model is constructed based on the Euler beam unit theory, and system steady-state displacement is solved through iteration; and finally, calculating roller slice load and contact stress distribution according to the steady-state displacement. The method does not need to depend on a complex partial differential or numerical difference method, the calculation process is simplified, the result stability is improved, shaft deformation and multi-factor comprehensive influence are accurately considered, and reliable data support is provided for bearing structure optimization and service life evaluation.

The application belongs to the field of bridge structure vibration test and safety detection and evaluation, and particularly relates to a simply supported beam bridge bearing stiffness rapid test and evaluation method based on local vibration mode. A small number of acceleration sensors are arranged in the cross-bridge direction of the mid-span section of the simply supported beam bridge during the test. The first three orders of frequencies of the environment excitation bridge and the local vibration mode of the main beam are tested under the condition that the bridge traffic is not interrupted. The shape of the first three orders of local vibration modes is usually characterized by "one flat, two inclined and three curved" in the cross-bridge direction. Then, the displacement flexibility matrix of the main beam structure is calculated and identified in combination with the finite element model, the actual modal deflection of the mid-span measuring point of the bridge under the equivalent load of the static load test is predicted, the deflection checking coefficient of the main beam is calculated according to the actual modal deflection value of the mid-span measuring point of the bridge and the theoretical design deflection value, and whether the actual bearing state of the bridge structure meets the design requirements is judged. The method has the advantages that the detection and evaluation rate of the bearing state of the bridge is improved, the detection cost is reduced, and the bridge traffic does not need to be interrupted.