72 results about "Coupling vibration" patented technology

The invention relates to the technical field of signal processing, in particular to a high-speed unmanned aerial vehicle structure servo elastic coupling vibration suppression control method, system and device, a medium and a program product. Obtaining a target control loop causing resonance; spectral analysis is carried out, and double-center frequencies causing resonance are obtained; a cascade wave trap with double center frequencies is designed; and the servo elastic coupling vibration of the unmanned aerial vehicle structure is suppressed. According to the method, the problems of difficulty in structure modification, narrow notch frequency range and large low-pass filtering delay of an existing structure servo elastic coupling resonance solving method are solved, the performance of a control system cannot be reduced, and the flight safety is ensured.

The invention relates to the technical field of industrial equipment predictive maintenance and fault diagnosis, in particular to a multi-motor coupling vibration intelligent diagnosis method and system. According to the technical scheme, the method comprises the following steps: generating a coupled vibration simulation data set with an accurate fault tag through a parameterized fault simulation module based on collected vibration data of multiple motors in a normal operation state and physical parameters of motor equipment; according to the invention, cold start of the diagnosis system under the condition of no historical fault sample is realized; a deep reinforcement learning agent is used for processing a space-time coupling signal, and a layered reward mechanism is combined, so that the decoupling diagnosis precision and the early warning capability are remarkably improved; through the online self-adaptive learning module, the system can be finely adjusted in real time according to field feedback to quickly adapt to the state of individual equipment; and the simulation-model evolution module continuously optimizes the simulator and the diagnosis model by using the accumulated real data to form a self-iterative closed loop.

The invention discloses a carrier roller fault diagnosis method and system based on coupled vibration analysis, and the method specifically comprises the steps: separating a phase-sensitive optical time domain reflection signal based on a physical parameter of a conveying system, separating the phase-sensitive optical time domain reflection signal into a direct vibration signal and a conveying belt conduction vibration signal, recording the direct vibration signal as a first frequency band signal, and recording the second frequency band signal as a second frequency band signal; recording the conveying belt conduction vibration signal as a second frequency band signal; calculating a feature vector of the first frequency band signal to obtain a first feature vector set; calculating a feature vector of the second frequency band signal to obtain a second feature vector set; and carrying out feature fusion on the first feature vector set and the second feature vector set, and obtaining probability distribution of fault categories based on fused features. According to the method, the physical phenomenon of'conveying belt-carrier roller coupling vibration 'is systematically utilized for the first time, the defects that an existing method is single in dimension and prone to being interfered are overcome through double-channel feature fusion analysis, and the accuracy and robustness of early fault diagnosis of the carrier roller of the long-distance belt conveyor are remarkably improved.

The invention discloses an electric reactor multi-field coupling vibration fatigue simulation method and system based on an S-N curve, and belongs to the technical field of electric power equipment fatigue simulation, and the method comprises the steps: obtaining structure parameters and material parameters of a target electric reactor, and building a parameterized physical model comprising an iron core, a winding and an insulation assembly; based on the parameterized physical model of the target reactor, simulating a time-varying mechanical force in the target reactor under the excitation of rated power frequency current; according to the time-varying mechanical force, calculating the vibration response of each part of the target reactor, and extracting the alternating stress distribution of the target reactor under the steady-state operation condition; and based on the material S-N curve of each component of the target reactor, analyzing the alternating stress distribution by adopting a linear cumulative damage theory, and calculating the failure cycle index and the fatigue life of each component under the preset cycle load. According to the method, through multi-field coupling simulation and S-N curve analysis, the fatigue life of the electric reactor is predicted, and a basis is provided for preventive maintenance.

The present application relates to a kind of theoretical detection methods for determining local void of monolithic track bed, comprising the steps of: obtaining train-monolithic track bed-lining-ground coupling vibration equation according to the control equation of rail, monolithic track bed and lining and the dynamic balance equation of train, the vertical acceleration of car body is calculated using Newmark algorithm;The Hilbert-Huang transform spectrum of the vertical acceleration of car body is obtained;According to the energy change of the Hilbert-Huang transform spectrum of the imf2 decomposition curve under the void state, the position of the local void area of monolithic track bed is judged.The beneficial effects of the present application are: the position of the local void area of monolithic track bed can be judged according to the energy value change of the Hilbert-Huang transform spectrum of the vertical acceleration of car body imf2;Whether there is track bed void and the starting position of void can be judged, and the severity of void length can be qualitatively estimated according to the length of energy value change, which helps to reduce the operation and maintenance cost of subway track.

The application discloses a kind of balanced cutting adaptive control method, system and numerical control lathe, belong to numerical control machine tool technical field, solve double-spindle double-tool turret numerical control lathe in double-tool turret balanced cutting finishing stage, because of cutting fluid impact, servo response difference and temperature gradient cause cutting force-thermal deformation coupling vibration, lead to surface finish deteriorate, while conventional detection cannot be identified, finally cause precision parts batch scrapping problem.It includes the following steps: initialization and reference calibration step, determine the fixed parameters required for algorithm operation and store in numerical control system parameter table.The application is by collecting double-tool turret servo current and decoupling into high-frequency component and low-frequency component, using high-frequency component to adjust feed rate, using low-frequency component to offset radial position, to cut off the positive feedback coupling chain between cutting force fluctuation, chip shape change, cooling liquid jet deflection, temperature field distribution change and cutting depth fluctuation, suppress non-periodic dynamic vibration response, avoid machining surface finish deterioration.

In ERIT, it is necessary to set a reference model for generating a target command for an ideal response before FF control design, and if an appropriate reference model cannot be set, coupled vibration caused by a plurality of structures cannot be suppressed. Further, when the characteristics of the plant are partially or entirely unknown, it is practically impossible to provide an appropriate reference model. Therefore, an object of the present invention is to provide a design method and a design device for data-driven damping feedforward control that can eliminate the need to set a complicated reference model.SOLUTION: A feedforward control design method has a controller structure in which a plurality of feedforward controllers to be designed are provided, a denominator polynomial of each feedforward controller is common, and a numerator polynomial is a free parameter, and the free parameter is designed by solving an optimization problem for minimizing a deviation between a target command generated by one feedforward controller among the plurality of feedforward controllers and a predicted response.SELECTED DRAWING: Figure 2

The invention relates to the technical field of medical instruments, in particular to a piezoelectric driving miniature optical probe for cerebrovascular interventional imaging, which comprises a glass tube base body, a single piezoelectric ceramic piece and the like, and is characterized in that the glass tube base body is of a hollow cylindrical structure, and an inclined groove is formed in the axial center of the glass tube base body; the single piezoelectric ceramic piece is fixed on the outer side of the glass tube base body. Through a hollow rod type stator structure composed of a single piezoelectric ceramic piece and a glass tube base body with a 10-degree inclined groove, mode conversion from longitudinal vibration to longitudinal-torsional coupling vibration is achieved, an elliptical motion track is formed at the position of a miniature magnetic ring at the front end of the stator, 360-degree optical scanning is achieved through friction driving of a rotor, and the mechanical property of the motor is improved. Compared with a traditional far-end miniature probe with the diameter usually larger than 1.5 mm, the whole outer diameter of the probe is reduced to 0.4 mm, and smooth navigation and passing in tortuous and narrow brain middle artery (the diameter is usually smaller than 0.5 mm) are easier.

This invention relates to the field of structural vibration testing and analysis technology, and discloses a method and system for vibration reduction detection of expansion joints based on vehicle-bridge-joint coupled vibration analysis. The method includes: constructing a cross-sectional coordinate system and obtaining a digitized contour line; performing interferometric analysis based on the load contact envelope to generate a pressure distribution matrix, and obtaining a set of acoustic and vibration characteristic vectors; reconstructing a vibration diagnosis plane and constructing a dynamic performance safety domain; executing a three-layer screening logic to obtain a set of equilibrium calibration parameters; constructing a physical calibration command sequence to drive relevant actuators to perform physical parameter compensation, and obtaining a test compliance verification mark. This invention solves the problem of dynamic distortion caused by the simplification of the cross-section of the beam steel section, realizes multi-index collaborative diagnosis and accurate parameter implementation, eliminates vehicle bounce impact and vibration noise, and improves bridge ride comfort, structural durability, and operational safety.

This invention discloses a variable center-of-mass bending-torsional coupling piezoelectric energy harvesting device, belonging to the field of piezoelectric material energy harvesting control. The device includes a mountain-shaped cantilever beam, piezoelectric ceramic plates, and two sets of variable center-of-mass mechanisms. The mountain-shaped cantilever beam is fixed to a support plate, and the piezoelectric ceramic plates are adhered to it. The two sets of variable center-of-mass mechanisms are respectively connected to both ends of the mountain-shaped cantilever beam, and rubber films are adhered to the opposite cavities of the two water tanks. External excitation causes the water in the water tanks to vibrate, and the centers of mass of the two water tanks shift in opposite directions, generating torque in opposite directions. This drives the mountain-shaped cantilever beam to undergo bending-torsional coupling vibration. The piezoelectric ceramic plates convert their mechanical energy into electrical energy through the positive piezoelectric effect and harvest it. This invention improves energy harvesting efficiency compared to traditional single bending type piezoelectric energy harvesting devices by utilizing the variable center-of-mass mechanism to generate bending-torsional coupling vibration and harvest energy. Simultaneously, by utilizing the center-of-mass shift caused by water vibration to induce bending-torsional coupling vibration in the mountain-shaped cantilever beam and harvest energy, it improves energy utilization.

The application discloses a kind of harmonic optimization and torque compensation fusion electric drive system collaborative vibration suppression method, belong to electric drive system collaborative vibration suppression field, this method includes the half shaft speed difference as state variable input ADRC controller, obtains torque compensation control quantity;Torque compensation control quantity and original target torque instruction are superimposed, obtain final target torque instruction;Get d-q axis target current instruction;According to d-q axis target current instruction, obtain d-q axis harmonic current injection quantity, and with d-q axis target current instruction is superimposed, obtain final d-q axis target current instruction, and with current d-q axis current difference after input current loop, and by vector pulse width modulation algorithm SVPWM, obtain the driving signal of motor at current time.The application solves the problem that existing method only relies on single control strategy, lack of steady-state, transient state Working condition electric drive system multi-physical field coupling vibration collaborative optimization, overall suppression effect is not good.

The application provides an active vibration control system and method. By collecting displacement, velocity and acceleration information of the lifting rod, the transverse moving rod and the overturning shaft, and synchronously collecting the amplitude of external vibration disturbance acting on the trolley structure; based on the connection mode of the trolley rod, the joint friction characteristics, the component inertia parameters and the coupling torque parameters between joints, a multi-degree-of-freedom mechanical model of the trolley is established or updated; the real-time state input of the state collection step is input into the mechanical model, the coupling vibration amplitude of each degree of freedom under the current disturbance is calculated, and vibration evaluation is performed; a multi-axis cooperative control algorithm is used to determine a set of coordinated control quantities for reducing the coupling vibration amplitude; the control quantities obtained in the control quantity generation step are output to the lifting rod, the transverse moving rod and the overturning shaft at the same time to drive the coordinated action of each degree of freedom to suppress vibration, so that the vibration amplitude of the corbel formwork trolley is kept within the preset vibration threshold.

The invention discloses an active suppression system and method for coupling vibration of a one-hole multi-tail water system, and the system comprises an active elastic regulation and control device which is installed in a runner cone cavity of a runner of a water turbine of each unit, and the active elastic regulation and control device comprises a central air supplement pipe and a rubber sleeve which sleeves the tail part of the central air supplement pipe; the rubber sleeve is fixedly connected and sealed with the tail of the central blowdown pipe to form an independent variable-volume gas cavity, namely a rubber cavity, an electromagnetic air valve is arranged at the tail of the central blowdown pipe, and a pressure sensor is arranged at an outlet of a unit in the tail water system. The pressure sensor and the electromagnetic air valve are respectively connected with the controller through control signal lines, and the air charging and discharging system is communicated with the head of the central air supplementing pipe; the elastic regulation and control device is arranged in the cavity of the runner runner cone of the water turbine, the water hammer wave propagation characteristic of a tail water system is actively changed, and suppression of coupling vibration is achieved.

The present application belongs to the field of wind tunnel structure design, and discloses a wind tunnel adjusting sheet structure with boundary conversion capability. The wind tunnel adjusting sheet structure comprises a test section, an adjusting sheet assembly, a connecting rod, a boundary conversion device, a side wall plate and a dynamic seal, and comprises a transonic second throat or a supersonic diffusion section composed of the adjusting sheet assembly symmetrically arranged above and below the test section and the two side wall plates symmetrically arranged left and right. The adjusting sheet assembly comprises three adjusting sheets connected in sequence and a constraint damping unit fixed to the leeward surface of each adjusting sheet. The middle adjusting sheet is connected with an external driving mechanism through the connecting rod installed on the leeward surface. The boundary conversion device converts the boundary state from a friction constraint boundary state to a free boundary state, and reduces the fluid-structure coupling vibration response of the adjusting sheet assembly caused by oblique shock waves and normal shock waves. The active, real-time and reversible switching of the boundary condition is realized, and the vibration suppression capability, operation safety, sealing life and flow field control precision of the adjusting sheet are improved, which has engineering practical value.

The present application relates to the field of oil and gas pipeline test, in particular to a temperature-medium environment-stress-vibration coupling test device and method; including a vibration table and a device body arranged on the vibration table; a sample is installed in the device body, the device body includes an environment tank, an upper chuck connected with the top of the environment tank and a lower chuck connected with the bottom of the environment tank, and a sample is installed in the environment tank. The vibration table cooperates with the second loading device to realize the vibration test, and the above-mentioned device cooperates to realize the simulation test environment of the pipeline material under the multi-factor coupling vibration service behavior, so that the researchers can accurately simulate various complex stresses, vibration conditions, temperature changes and medium environment corrosion and other influencing factors suffered by the pipeline material in the actual working condition under the laboratory conditions, thereby providing the basis for the service behavior and performance research of the material.

This invention discloses an ultrasonic-mechanical coupled vibration rolling composite equipment and method for metal layered composite materials, belonging to the field of metal layered composite material preparation technology. The equipment includes a rolling mechanism, a mechanical vibration mechanism, and an ultrasonic vibration mechanism. The mechanical vibration mechanism is mounted on the side of the first work roll of the rolling mechanism via a crankshaft and connecting rod actuation, providing mechanical vibration to the first work roll to improve the interfacial misalignment rate and enhance the interfacial bonding strength of the metal layered composite material. The ultrasonic vibration mechanism is connected to the second work roll of the rolling mechanism, leveraging the volume effect of ultrasonic vibration to coordinate the deformation of the constituent metal materials. The method of this invention is simple in process, convenient to implement, has high production efficiency and low cost, and produces metal layered composite materials with high interfacial bonding strength, good geometric accuracy, low internal residual stress, and no anisotropy problems.

The invention relates to a vehicle-rail-bridge coupled vibration time-frequency hybrid analysis method, device and equipment, a storage medium and a program product, and relates to the technical field of vibration simulation analysis. The numerical calculation efficiency can be improved. The method comprises the following steps: performing analog simulation by utilizing a virtual excitation method based on a track model to construct a vehicle-track coupling frequency domain model, and inputting a track irregularity frequency spectrum into the vehicle-track coupling frequency domain model for solving to obtain a beam-track interfacial force frequency spectrum; inverse fast Fourier transform is carried out according to the beam-rail interfacial force frequency spectrum to obtain a beam-rail interfacial force time history, and whether the wheel-rail force difference value meets a threshold value condition or not is judged; if the wheel-rail force difference value meets the threshold value condition, analog simulation is conducted through a modal superposition method to construct a bridge time domain model, the vehicle-rail coupling frequency domain model and the bridge time domain model are coupled according to the beam-rail interface force and displacement of the current wheel, and a vehicle-rail-bridge coupling frequency domain model is obtained; and vibration time-frequency hybrid analysis is carried out through the vehicle track bridge coupling frequency domain model.

The application belongs to the technical field of material science and engineering, and discloses a stress elimination method for flexible crystalline optoelectronic thin film. The method comprises the following steps: eliminating the stress of the crystalline optoelectronic thin film by using liquid-phase assisted vibration aging. The method involves complex links such as efficient deposition of the crystalline optoelectronic thin film, selection of a vibration clamp, parameter regulation and matching of a high-frequency vibration source, and needs multi-step precise operation. Meanwhile, the vibration and temperature compensation need to be balanced to avoid adverse effects on the thin film. The application realizes in-situ stress elimination of the crystalline optoelectronic thin film under low-temperature conditions by means of liquid-solid coupling vibration to induce lattice dislocation slip and micro-plastic deformation. The advantage of the application is that the crystalline optoelectronic thin film on any complex substrate can be subjected to global homogenization stress regulation, the thin film quality can be effectively improved, the performance and stability of the crystalline optoelectronic thin film can be enhanced, and the application potential of the crystalline optoelectronic thin film on various substrates and optoelectronic devices is expanded.

The invention relates to the crossing field of computer technology and large-scale machinery monitoring, and particularly discloses a vibration energy monitoring method and system for large-scale steel structure rotating machinery, and the method comprises the steps: S1, carrying out the fusion collection of multi-source coupling vibration signals; s2, respectively calculating local vibration energy of a rotating part and a steel structure, analyzing and determining a coupling coefficient, quantizing coupling transfer energy, introducing an energy attenuation coefficient for correction to obtain total vibration energy of a system, and establishing a model parameter dynamic updating mechanism; s3, extracting time domain, frequency domain and energy domain characteristics of coupled vibration, and reducing the influence of environmental interference on signal quality; and S4, a dynamic energy baseline is constructed and updated in real time, multi-dimensional abnormal features are extracted, a fault diagnosis model is input to realize fault type and severity judgment, and early warning information of a corresponding level is output. The problems of insufficient coupling description, unbalanced precision and real-time performance and the like of traditional monitoring are solved, and reliable operation of equipment is guaranteed.

This invention relates to the field of control support technology, and in particular to a dual-mode adaptive spring dynamic support system and its control method. The system includes a support module and a control module. The support module adjusts the stiffness of the spring body by adjusting components, dynamically adjusting the ratio of the preload force to the stiffness of the suction head on the workpiece. The control module constructs a coupled vibration dynamics model, determines the coupling strength based on the off-diagonal elements of the stiffness matrix, and performs differentiated stiffness configuration on the spring body. By matching the first and second natural frequencies of the system through differentiated stiffness configuration, the active broadening of the dual-mode chatter suppression frequency band is achieved. This effectively decouples the translational and torsional modes, disrupts the chatter energy feedback loop, and significantly improves the dynamic stability and machining quality of thin-walled parts under complex cutting conditions by constructing a stiffness gradient field in the machining area.

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

This invention discloses a method for solving the thermo-coupling vibration characteristics of a precision gearbox based on multi-field coupling, which includes the following steps: (1) Considering the time-varying load distribution characteristics between the gear teeth of the precision gearbox, constructing a vibration differential model of the precision gearbox; (2) Discretizing the precision gearbox into a series of thermal nodes connected by thermal impedance, establishing a heat transfer model of the precision gearbox; (3) Assuming that the meshing between the gear teeth is a line contact unit, establishing a lubrication model of the precision gearbox; (4) Using a stepwise correlation method, performing real-time iterative coupling of the vibration model, lubrication model and heat transfer model of the precision gearbox, and solving for the vibration characteristics, oil film distribution and heat generation of the precision gearbox under multi-physics coupling conditions; The beneficial effect of this invention is that it can systematically reveal the vibration characteristics of the precision gearbox, the multi-physics coupling interaction mechanism between lubrication and heat transfer, and provide theoretical support for the design of precision gearboxes.

This invention relates to a method for modeling and analyzing the vertical coupling vibration of a multidimensional eccentric hub motor, comprising: constructing a static multidimensional eccentric geometric representation model of the hub motor to determine the system coupling parameters; based on the system coupling parameters, establishing a three-dimensional air gap magnetic field analytical model of the segmented skew-pole hub motor under eccentric conditions; establishing a vertical dynamic model of the hub drive system under coupled excitation; based on the three-dimensional air gap magnetic field analytical model and the vertical dynamic model, and combined with the road excitation model and the permanent magnet synchronous motor vector control model, integrating and constructing a multi-physics coupling simulation system of mechanical-electrical-magnetic-solid-state excitation; and based on the multi-physics coupling simulation system of mechanical-electrical-magnetic-solid-state excitation, analyzing the vertical coupling vibration response characteristics of the hub motor under coupled excitation by setting different unsteady working conditions. Compared with the prior art, this invention, through multidimensional eccentric representation and coupled dynamic modeling, can accurately simulate the complex interaction of electromagnetic, mechanical and road excitations under unsteady working conditions.

The invention belongs to the technical field of motor design analysis, and particularly relates to a motor rotor magnetic-solid-heat multi-field coupling vibration response analysis method, which considers the unbalanced magnetic pulling force of an electromagnetic field, the bearing reaction force of a rolling bearing of a structural field, the temperature rise of a temperature field and other influence factors. The vibration response characteristics of the motor rotor under the magnetic-solid-thermal multi-field coupling effect can be accurately and efficiently analyzed and obtained, and a reliable basis is provided for dynamic strength evaluation and optimization of a motor rotor system.

This invention discloses a torsional-lateral coupling vibration control device for a gear system based on electro-magnetic drive, comprising a base, a stator fixed to the base, a gear body connected to the shaft body, and a mover fixed to the gear shaft body. The mover is located in the middle of the stator, and a magnetorheological fluid is injected into and sealed in the cavity between the stator and the mover. Two sets of torsional excitation coils wound along the circumferential direction of the shaft are symmetrically arranged in the stator about the mover. The tangential torque of the magnetorheological fluid is changed by adjusting the excitation current. A torsional vibration isolation ring is provided in the inner diameter direction of the torsional excitation coil windings. Multiple pairs of poles are provided in the stator, and a uniform air gap is provided between the poles and the mover. A transverse vibration excitation coil is wound on each pole, and each set of transverse vibration excitation coils forms an electromagnet. The transverse constraint of the electromagnet on the mover is changed by adjusting the excitation current. A transverse vibration isolation ring is provided between the mover and the stator wall. This invention can reduce vibration and noise.

The application relates to a bearing radial clearance state monitoring method and device in a gear-shaft-bearing system. The method comprises the following steps: arranging an acceleration sensor at a position close to the bearing of a gear box of a gear-shaft-bearing-box fourteen-degree-of-freedom nonlinear coupling vibration system, continuously collecting vibration time domain signals of the system at different running moments, carrying out detrending and filtering processing on the vibration time domain signals, and obtaining pretreated signals; carrying out discrete Fourier transform on the pretreated signals, obtaining modulation signal bispectrum based on traditional bispectrum expansion; carrying out carrier frequency normalization processing on the modulation signal bispectrum, obtaining nine groups of MSB-SE amplitudes, superimposing the nine groups of MSB-SE amplitudes on (1, 2, 3) x GMF on (1, 2, 3) x BPFO, obtaining MSB-SE comprehensive indexes of each moment for monitoring the bearing radial clearance, drawing a curve of the indexes changing with running time, and determining a bearing radial clearance monitoring result. The accurate and online monitoring of the bearing radial clearance is realized.

The invention relates to the technical field of structural vibration test and analysis, and discloses an expansion joint vibration reduction detection method and system based on vehicle-bridge-joint coupling vibration analysis. The method comprises the following steps: constructing a section coordinate system, obtaining a digital contour line, executing interference analysis according to a load contact envelope line to generate a pressure distribution matrix, and obtaining a sound vibration feature vector set; reconstructing a vibration diagnosis plane and constructing a dynamic performance security domain, and executing three-layer screening logic to obtain a balance calibration parameter solution set; and constructing a physical calibration instruction sequence to drive a related execution mechanism to execute physical parameter compensation to obtain a test standard-reaching verification identifier. The problem of dynamic distortion caused by section steel section simplification of the middle beam section steel is solved, multi-index collaborative diagnosis and accurate parameter landing are achieved, bump impact and vibration noise are eliminated, and bridge driving smoothness, structural durability and operation safety are improved.

This invention relates to the field of construction safety monitoring technology, and provides a method and system for assessing the compliance of safety behaviors at highway construction sites. The method includes the following steps: real-time acquisition of ground coupled vibration data; removal of interference features from the ground coupled vibration data, extraction of structural vibration feature sequences and high-frequency micro-vibration feature sequences, and reconstruction of these sequences to obtain a set of mechanical operation behavior parameters and a set of gait behavior parameters; synchronous mapping of the mechanical operation behavior parameter set and the gait behavior parameter set to a unified three-dimensional geographic information spatiotemporal grid to generate a dynamic construction activity coupled field; and real-time determination of human-machine interaction distance and the risk of mechanical operation restricted area intrusion within the construction activity coupled field to obtain a safety behavior compliance assessment result. This invention can complete on-site safety behavior compliance determination without relying on optical line-of-sight, effectively overcoming the recognition deficiencies of traditional video surveillance under conditions such as dust, rain, fog, and nighttime.

This invention discloses a decoupling method for multi-source coupled vibration signals in a hydroelectric generator, comprising the following steps: acquiring horizontal and vertical vibration signals of the hydroelectric generator at a preset frequency and preprocessing them to obtain measured vibration signals; weighting the measured vibration signals using a constructed time-domain convolution window and then performing a Fourier transform to obtain a constant frequency; performing a second-order Taylor expansion on the instantaneous phasors of the measured vibration signals in amplitude and phase representation to obtain a multi-source coupled vibration signal model; solving the error equation between the measured vibration signals and the model to obtain the instantaneous vector of the measured vibration signals, which is the modulation signal of the original vibration signals, thus achieving decoupling of the vibration signals. This invention, based on the accurate measurement of the original frequency of the vibration signal by constructing a novel window function, establishes a vibration signal model under multi-source coupling based on Taylor expansion, and then achieves decoupling of the vibration signals under fast time-varying and high-frequency conditions by solving the model parameters.

The invention discloses a multi-bench parallel pushing type multi-degree-of-freedom vibration test system and method, and belongs to the field of vibration tests. The system comprises a master control unit, a sensor network and four vibration table single systems in a 2 * 2 rectangular array, wherein each single system comprises a working table, three vibration generators, three double-spherical hinge series decoupling devices and a power amplifier. Z-direction excitation is achieved through the two vertical vibration generators, Y-direction excitation is achieved through the horizontal vibration generator, and multi-degree-of-freedom motion constraint is released through the double-spherical-hinge series decoupling device. And the master control unit adopts a closed-loop cooperative control method based on the feedback of the sensor: comparing the actual excitation force with a preset thrust target value, calibrating the linear relationship between the output force and the proportionality coefficient of the driving signal through a two-point linear formula, inversely solving and correcting the driving signal, and compensating the individual difference, thereby realizing the high-precision synchronization of the 12 vibration generators. The system can reproduce five-degree-of-freedom coupling vibration of a large-span test piece, and is suitable for simulation of a transportation environment of a concrete precast beam more than 20 meters.