21 results about "Bridge vibration" patented technology

The application relates to the technical field of bridge vibration control, in particular to a bridge excitation and damping integrated device, a bridge and a laying method. The bridge excitation and damping integrated device comprises a mass block, a spring assembly, an actuator and two groups of lever assemblies. The middle part of the mass block is provided with a mounting hole, and a flywheel is arranged on the mass block. The spring assembly is arranged below the mass block and connected with the mass block, and the other end is connected with a structure to be damped. The actuator is arranged in the range of the mounting hole. The two groups of lever assemblies are respectively connected with the mass blocks on the two sides of the mounting hole through power arm ends, and the resistance arm ends are connected with the end parts of the telescopic rods of the actuator. When the telescopic rods of the actuator are telescopically extended or retracted, the mass blocks are driven to move up and down through the lever assemblies. The problem that the damping effect is only predicted through numerical simulation or simplified model test in the prior art and it is difficult to adjust parameters after installation can be solved. In addition, the nesting layout of the actuator and the mass block can reduce the requirement for the installation space by using the lever displacement amplification principle.

This invention discloses a safety mechanism for a steel frame bridge connection device, including a traction cable, a damping assembly, and accessory supports. The traction cable is vertically installed on the bridge body. The damping assembly consists of an elastic sleeve and a rigid sleeve. The elastic sleeve has circumferentially spaced damping cavities filled with a fluid medium on its wall. The rigid sleeve has an annular cavity connected to each damping cavity via a bypass hole. A retractable and controllable plunger is installed within the annular cavity. This invention can dynamically adjust the damping and damping force by pressurizing or depressurizing the fluid through the expansion and contraction of the plunger according to the bridge's vibration state, achieving adaptive matching of damping parameters. This solves the problem that existing passive devices cannot adaptively adjust, effectively coping with large-amplitude, wide-frequency, and high-frequency vibrations, avoiding resonance and damping failure, and significantly improving the damping effect, stability, and protection life of the bridge connection structure.

The utility model discloses bridge bearing capacity nondestructive testing device belongs to bridge bearing capacity detection technical field, and its technical key points include clamping subassembly, exciter subassembly, limiting component and hoist subassembly. The utility model, when the bearing capacity of bridge is detected, in order to avoid damaging bridge during detection, therefore can first place the piece and connect on bridge guardrail, at this time through hoist subassembly can move installation spare to bridge side end, and through the clamping of two clamping plates, can make installation spare can stably set up in bridge side end, at this time through limiting component can be fixed to the position of two clamping plates, thereby avoid installation spare to fall off, after can through single heavy vehicle and travel at different speeds and inspire bridge vibration, and through exciter subassembly vibration data collection, detection, thereby can detect the bearing capacity of bridge.

In order to overcome the problem that the current technology is difficult to estimate and continuously correct the bridge twin model by obtaining a series of test and test data, the application provides a bridge twin dynamic model Fourier modeling method based on test data, which is only related to the parameters of the bridge according to the system matrix related to all nodes of the bridge and the observation coefficient matrix related to all nodes, and the first continuous test process of the bridge does not change greatly, and the first comprehensive detection of the bridge twin dynamic mathematical model and the subsequent each time of the bridge twin dynamic mathematical model comprehensive correction process is relatively short, according to the characteristics of the fast and slow change matrix, the slow change matrix is set as a constant matrix in the first continuous test, and the system matrix related to all nodes of the bridge and the observation coefficient matrix related to all nodes in the bridge twin model are established through a series of effective tests and optimal indexes, and the bridge twin model is continuously corrected in the whole life cycle of the bridge, so that the technical problem of estimating and improving the bridge vibration model by obtaining a series of test and test data is solved.

This invention proposes a method for multi-target recognition, tracking, and vibration extraction of bridge cable-stayed bridge videos based on unmanned aerial vehicles (UAVs). The method includes: Step 1: Constructing a refined tilted and slender target detection model for bridge cable-stayed bridges based on the YOLOv11 model; Step 2: Proposing a multi-target tracking algorithm that integrates the tilted and slender target detection model and the StrongSORT algorithm; Step 3: Improving the displacement extraction method by combining SIFT / ORB feature point matching and sub-pixel refinement techniques; Step 4: Designing a UAV motion correction algorithm based on variational mode decomposition and time-frequency domain joint screening; Step 5: Constructing a joint working mode analysis algorithm that combines natural excitation technology and random subspace recognition algorithm. This method achieves high-precision extraction of cable-stayed bridge vibration signals and identification of cable-stayed bridge modal parameters, providing technical support for health monitoring of long-span cable-stayed bridges.

This invention provides a displacement-amplified energy-dissipating vibration damping device for bridges, relating to the technical field of bridge vibration damping equipment. A base structure is slidably connected to a slider structure along a first direction. A connecting steel arm structure is used to connect to the main beam, and includes a first gear and a second gear coaxially connected. The first gear meshes with the base structure; the second gear meshes with the slider structure, so that when the connecting steel arm structure moves relative to the base structure along the first direction, the slider structure moves in the same direction as the connecting steel arm structure. The energy-dissipating structure includes a pin and two sets of elastic energy-dissipating components connected by the pin. The base structure limits the movement of the two sets of elastic energy-dissipating components along the first direction. This invention alleviates the technical problem in the prior art where limited relative displacement makes it difficult to fully dissipate seismic input energy, thus restricting the working efficiency and energy dissipation effect of the vibration damping device, leading to significant damage to bridges and traffic disruption.

In order to overcome the technical problem that the bridge vibration model cannot be estimated and improved by obtaining a series of test and test data at present, the application provides a vibration modeling method based on test and test bridge data, which first obtains relevant data through a series of tests with different loads at different positions, and gives the effectiveness of the series of tests, so as to obtain the balance equation system matrix of all nodes of the whole bridge under the condition of no external force by an estimation method; in the dynamic test of the comprehensive detection process of the bridge vibration model, the type, weight, coordinate position, speed and acceleration of the vehicle are different each time, so as to ensure the effectiveness of the dynamic test, so as to obtain the system matrix of the bridge vibration model by the estimation method; by the first comprehensive detection and the regular comprehensive correction of the bridge vibration model, the change rule of each parameter with time is obtained, basic data for describing the whole life cycle of the bridge are provided, and the technical problem that the bridge vibration model is estimated and improved by obtaining a series of test and test data is solved.

The application discloses a bridge tunnel line shape and rigidity detection method and system based on an optical fiber sensing technology, relates to the technical field of bridge displacement monitoring, and comprises a fiber grating strain sensor, a fiber grating displacement sensor, a rigidity detection module, an acceleration sensor, an analog-digital conversion module, an amplification circuit module, a filter circuit module, a data processing module, a data transmission module, an interface module, a memory module, a display module, an alarm module, a clock module and a power module. The application realizes the functions of real-time monitoring of physical parameters such as bridge stress, bridge main bridge tower displacement, bridge vibration quantity, bridge vertical distance change quantity and displacement, data analysis and processing, bridge health state evaluation, bridge structure health early warning and the like by monitoring various parameters of the bridge in real time through a wireless sensor network, and effectively avoids various accidents.

This utility model discloses a bridge vibration damping bearing, including an installation assembly for connecting to a bridge or other object, comprising a lower support plate and an upper support plate. This utility model constructs a graded vibration damping system of "flexible buffer + rigid damping" through the synergistic design of rubber columns and vibration damping components. Specifically, the rubber columns preferentially absorb minor vibrations of the bridge structure using elastic deformation, avoiding insufficient energy dissipation due to premature intervention of rigid components. When encountering strong vibrations, the springs and dampers in the vibration damping components work together to dissipate high-energy vibration energy through elastic deformation and fluid damping effects. This design overcomes the limitations of traditional single vibration damping mechanisms, solving the failure risk of rubber bearings under strong vibrations and compensating for the insufficient absorption of minor vibrations by rigid dampers. It achieves efficient tiered treatment of vibrations of different intensities, significantly improving the safety and durability of bridge structures under complex working conditions.

The application discloses a kind of bridge vibration control effect online quantitative evaluation method and system, specifically related to bridge structure health monitoring technical field, for solving the problem that existing evaluation method based on historical benchmark drifts due to benchmark slowly degrades with performance, leading to early performance degradation insensitive;By online acquisition bridge vibration response data, the frequency band coherence entropy value between controlled correlation measuring points is calculated, time series is formed and statistical trend test is carried out, when significant upward trend is detected, the trend starting point is used as a boundary to divide pure historical data and current data, and then a statistical reference benchmark is established based on historical data, the performance state of control device is quantitatively evaluated by calculating the standardized deviation of current entropy value relative to the benchmark;It can sensitively identify slow performance degradation trend, realize early warning, and improve the preventive maintenance value of online evaluation.

This invention discloses a rapid bridge damping ratio identification method based on a stationary inspection vehicle, belonging to the field of bridge structure vibration testing technology. The method includes: parking the inspection vehicle at the mid-span of the bridge under inspection; exciting the bridge vibration using a passing vehicle and then driving away; collecting the acceleration response of the inspection vehicle in the attenuation segment; establishing a dynamic model of the attenuation segment of the vehicle-bridge coupled system; constructing a two-degree-of-freedom joint state model, internalizing the vehicle-bridge interaction force as a linear combination of system state variables; extracting the effective attenuation segment through signal preprocessing and introducing a dual anti-noise mechanism of adaptive signal-to-noise ratio weights and Huber weights; and employing a profiled two-stage parameter identification strategy, first locking the frequency and modal mass, and then finely scanning and identifying the bridge's first-order damping ratio. This invention requires only a single inspection vehicle and an acceleration sensor, eliminating the need to deploy sensors on the bridge structure. It has strong anti-interference capabilities, high identification accuracy, and is suitable for rapid inspection of small-to-medium span bridges.

The application discloses a kind of steel bridge deck pavement layer performance test methods considering bridge vibration, comprising: S1: the dynamics characteristic analysis is carried out to bridge prototype, obtains the inherent frequency of its first two orders with vertical bending deformation as main;S2: prepare deck pavement composite structure test piece according to the bridge to be researched;S3: establish double degree of freedom lumped mass-spring equivalent model, and define the coupling stiffness of equivalent model horizontal direction and vertical direction support stiffness;S4: with the frequency matching equation is established and is solved, determine the coupling stiffness and support stiffness of experimental model;S5: according to coupling stiffness and support stiffness build physical experimental model;S6: dynamic excitation is applied while synchronously collecting dynamic response data, and based on dynamic response data evaluates the dynamic response and performance under bridge vibration environment.The application solves the technical defects that traditional pavement paving experimental method is disjointed with bridge actual service condition, more truly simulates the response of pavement layer in whole bridge vibration.

This invention belongs to the field of bridge engineering technology and discloses a multi-stage variable friction energy dissipation bridge vibration damping device with constant pressure and anti-loosening function. It includes fixed friction plates, limiting rods, sliding friction plates, holes, a drive rod, a connecting rod, and a tension spring. Under the action of earthquakes, vehicles, and wind loads, when the main beam undergoes longitudinal and lateral displacement relative to the bridge tower, the drive rod causes displacement between the multi-layer sliding friction plates and the multi-layer fixed friction plates, generating frictional energy dissipation and suppressing vibration. The bridge vibration damping device of this invention has a simple structure, low cost, high friction force, constant force, low installation requirements, and good durability. The multi-layer fixed friction plates and sliding friction plates are made of non-uniform thickness plates, and the holes in different layers of sliding friction plates have different shapes, sizes, and positions to adapt to different amplitudes and energy dissipation requirements. The tension spring provides a persistent and constant pressure to the bridge vibration damping device, ensuring stable and reliable friction force and avoiding the defects of traditional bolt fastening methods, such as easy loosening and significant reduction in friction force.

This invention discloses an integrated bridge-embankment foundation protection structure and its design method in the field of water conservancy technology. It includes a bridge spanning a river and an embankment placed on the riverbank. The bridge has embankment piers within the embankment's front and rear protection zones. Isolation piles are installed at the embankment piers on both sides of the embankment. A protection zone is set outside the embankment, extending from the embankment toe to the vicinity of the embankment piers. The protection zone includes a cushion layer laid on the riverbed and connected to the embankment, with a thickness of 0.3m-0.5m. Gabion cages are laid on the cushion layer, with a thickness of not less than 1.0m. The width of the protection zone is determined comprehensively based on the scour depth at the embankment toe, the scour depth of the embankment piers, and the embankment grade. This invention proposes an integrated anti-scour measure for the scour of the embankment piers and the embankment foundation, and a "semi-enclosed" vibration isolation structure between the embankment piers and the embankment, thereby eliminating local hydraulic scour of the embankment piers and reducing the impact of bridge vibration on embankment safety, ensuring the stability and safety of the embankment and bridge structures.

The application discloses a bridge health state detection method and system based on a double-branch mamba network. The method comprises the following steps: collecting bridge vibration field data and processing, generating a vibration field time profile and an instantaneous frequency diagram, obtaining a data set and a training set; taking the data set as input, constructing a double-path lightweight network model for bridge health state identification; using the training set to train and optimize the double-path lightweight network model; inputting a test sample into the trained double-path lightweight network model, outputting a bridge health state classification result, and evaluating the model performance. The system comprises a data acquisition module, a model construction module, a training module and a performance evaluation module. The application uses distributed sensors arranged on both sides of the bridge pavement, and uses vehicle driving as an excitation source, so that the bridge health condition detection can be realized without affecting the normal operation of traffic.

This invention belongs to the field of large-span bridge vibration excitation technology, and discloses a low-frequency, large-amplitude vibration excitation device for long-span bridges. This invention generates periodic vertical forces by controlling the direction and timing of water pump jets, providing a controllable vertical load to the bridge, thereby exciting large-amplitude vertical or torsional vibrations. By designing the water tank capacity, number of water pumps, nozzle diameter, and jet velocity, and employing a multi-nozzle parallel connection and phase control strategy, the jet force and water flow return force are optimized, significantly reducing system power, installation difficulty, and cost while achieving efficient excitation. Compared with existing technologies, this invention's low-frequency, large-amplitude vibration excitation device for long-span bridges does not require complex mechanical frequency tuning and actuators, is small in size, easy to assemble and disassemble, and has a flexible and adjustable control system that can quickly adapt to different vibration modes and frequency conditions of the bridge, demonstrating significant engineering application prospects and promotional value.

This invention discloses a prefabricated connection structure and design method for widening bridge decks without disrupting traffic, belonging to the field of road and bridge engineering technology. Addressing the problems of significant interference from vehicle-bridge vibrations at wet joints between new and old bridges, long concrete curing cycles at connection points, susceptibility to cracking due to vibration, settlement, and other factors, and unstable construction quality, this invention proposes the use of prefabricated reinforced concrete connection plates. The connection between the new and old bridge decks is achieved through welding of connectors. Furthermore, the prefabricated plates can be prefabricated in a prefabrication yard, saving time and improving quality. The welding of connectors allows for fast on-site operations with minimal traffic disruption.

This invention discloses a modular sound insulation and vibration damping assembly and fixing structure for automotive door interior panels, relating to the field of automotive interior component assembly and fixing technology. The structure includes a door interior panel substrate, a modular sound insulation and vibration damping unit, elastic vibration isolation fixing nodes, node-internal compression acquisition components, zoned vibration response acquisition components, and a control unit. The modular sound insulation and vibration damping unit is disposed on the side of the door interior panel substrate facing the inner sheet metal of the door. The elastic vibration isolation fixing nodes connect the door interior panel substrate and the inner sheet metal of the door, forming a pre-compression fit. The control unit generates a modular compression consistency constraint state based on the compression state, generates a sound bridge vibration intrusion state based on the vibration response, and maps it to a two-dimensional boundary field to obtain a fixed node state machine boundary parameter set, used to output abnormal fixed node positioning information or maintenance prompt information, thereby reducing the risk of local loosening, hard contact sound bridges, and abnormal noises.

The utility model relates to the technical field of suspension bridge, specifically relates to a suspension bridge damping central buckle and suspension bridge. The suspension bridge damping central buckle includes connecting rod spare, two ends of connecting rod spare are hinged with cable clamp and main beam each other, connecting rod spare is arranged symmetrically and forms triangular mechanism to restrain suspension main cable, connecting rod spare includes at least one section of corrugated steel pipe, both ends of connecting rod spare end face are all perpendicularly equipped with the connecting plate, is equipped with the hinge piece on the connecting plate to supply with the cable clamp and the main beam hinged. The utility model discloses through the axial elastic deformation of corrugated steel pipe and realizes energy dissipation mechanism - in the bridge vibration process, corrugated steel pipe can effectively absorb and convert structural kinetic energy through the reciprocating tensile - compression deformation, thereby significantly improves the anti -seismic performance of bridge system.

This invention relates to a method for predicting pedestrian comfort on bridges with mixed pedestrian and vehicular traffic, comprising: Step S1: establishing a three-dimensional finite element model of the bridge; Step S2: generating random traffic flow samples and random pedestrian loads; Step S3: obtaining the vehicle-induced bridge vibration response and the pedestrian-induced bridge vibration response respectively, and superimposing the vehicle-induced bridge vibration response and the pedestrian-induced bridge vibration response to obtain the full bridge response data; Step S4: starting from one end of the bridge, moving to the other end of the bridge according to a pre-configured walking speed, obtaining multiple bridge deck nodes and the sampling time of each bridge deck node, and obtaining the acceleration value of each bridge deck node based on the full bridge response data, and assembling the acceleration values ​​of all bridge deck nodes in sequence to form a follow-up acceleration time history; Step S5: calculating a comfort evaluation index based on the follow-up acceleration time history, and further obtaining the pedestrian comfort prediction result based on the comfort evaluation index. Compared with the prior art, this invention has advantages such as improved accuracy.

The application relates to the technical field of bridge health monitoring, in particular to a bridge vibration displacement visual measurement method based on deep learning, which comprises the following steps: a deep learning target detection model is used to identify a target in a video frame, and sub-pixel displacement between frames is calculated to form a displacement sequence; a vibration feature extraction network is constructed, the network adopts an encoder-decoder structure, multi-scale space-time features are extracted from the displacement sequence, and a vibration displacement time sequence is preliminarily reconstructed; a theoretical physical model of bridge vibration is established, the network preliminary reconstruction sequence and a theoretical model prediction value are fused through a Kalman filtering framework, and an optimized vibration displacement time sequence is obtained; spectrum analysis and modal decomposition reconstruction are carried out on the sequence, and final measurement results are obtained. The application combines the strong environmental adaptability of deep learning and the law constraint of a physical model, and improves the precision, robustness and reliability of bridge vibration displacement measurement in a complex environment.