395 results about "Coupling vibration" patented technology

Problems to be SolvedSurgical operation or others excellent in operability, safety, operation efficiency and precision are realized by outputting a vertical-torsional composite vibration through conversion processing of the longitudinal vibration from an ultrasonic oscillation mechanism and reducing the displacement speed of the non-working plane in a female portion less than the speed of the working plane.Means to Solve the ProblemA configuration, comprising an ultrasonic oscillation mechanism composed of a longitudinal vibration element, a backing plate and a front plate for generating an ultrasonic vibration, a horn coupled with the ultrasonic oscillation mechanism for amplifying the vibration transmitted from said ultrasonic oscillation mechanism, a vibration conversion mechanism for converting the vibration transmitted from said ultrasonic oscillation mechanism into a composite vibration composed of a longitudinal vibration in the horn central axial direction and a torsional vibration having the horn central axis as fulcrum, and a female portion provided with a working plane and disposed at said horn tip, wherein said ultrasonic oscillation mechanism is composed of one or more groove portions formed on the circumferential surface of the horn or said backing plate, and a speed variation mechanism of torsional vibration in said composite vibration is formed in the female portion, in order to reduce the reciprocating rotation speed of the non-working plane less than the speed of the working plane.

The invention provides a method for predicating noise simulation of a rail transit bridge structure. The method can be used for widening the noise analysis frequency band of a bridge structure and improving the predication precision and the calculation efficiency, and is applicable to structural noise analysis for bridges of different types. The method comprises the following steps: firstly collecting prediction parameters for noise simulation of the rail transit bridge structure and inputting the prediction parameters into a low frequency band train-rail-bridge coupled vibration model and an intermediate-high frequency band train-rail-bridge coupled vibration model so as to respectively calculate the vibratory response of the bridge structure and the vibratory response of a steel rail; and establishing a bridge sound radiation boundary element model with low-frequency band and a bridge sound radiation statistic energy analysis model with an intermediate-high frequency band, calculating the noise radiation of the bridge structure in the low-frequency band and the intermediate-high frequency band, and then utilizing the noise composition principle to predicate the total noises radiated by the bridge structure.

The invention provides a method for inhibiting the track coupled vibration of a suspension system of a magnetic suspension train; the method is as follows: bringing the characteristics of a magnetic track into the magnetic suspension train system to lead to a five-level system of the magnetic suspension train system; acquiring five independent state variables which represent the suspension train and track states; comprehensively controlling the magnetic suspension system according to the five state variables and adjusting the control variables of the system; controlling the suspension clearance of the magnetic suspension train in a certain range; inhibiting the coupled vibration of the track of the suspension system of the magnetic suspension train and realizing the stable suspension of the magnetic suspension train. The invention further provides a suspension control unit formed by a suspension magnet, a suspension sensor, a suspension controller, a differentiator and the like, and the suspension control unit is used as an execution element in the control. The method not only inhibits the coupled vibration of the track of the suspension system of the magnetic suspension train, but also effectively solves the problem of noise amplification in the ordinary differential method.

The present invention discloses a speech enhancing method, a speech enhancing device and a denoising communication headphone. In the solutions of the present invention, a first sound signal that comprises a user's speech signal transmitted through coupling vibration and an ambient noise signal transmitted through the air and a second sound signal that is mainly an ambient noise signal transmitted through the air are picked up by a primary vibration microphone and a secondary vibration microphone, respectively, that have a specific relative positional relationship therebetween, and the ambient noise signals picked up by the two vibration microphones are correlated with each other; a control parameter used to control an updating speed of an adaptive filter is determined according to the first sound signal and the second sound signal; the first sound signal is denoised and filtered according to the second sound signal and the control parameter; and the denoised and filtered speech signal is further denoised and speech high-frequency enhancement is performed thereon. The technical solutions of the present invention can effectively improve the signal to noise ratio (SNR) and the quality of speech in an environment of highly intense noises.

The invention discloses a bridge detection method and detection system based on vehicle-bridge coupling vibration analysis. The bridge detection method comprises the following steps: obtaining time-variant model parameters and time-invariant model parameters of having or not having vehicle passing through a group of sensors which are arranged on a bridge in the length direction; computing mass-normalized mode coefficients at moments of a bridge structure; resolving an average value of zoom coefficients at all moments; obtaining a mass-normalized mode of the structure; reconstructing a frequency-function matrix of the structure; conducting displacement flexibility identification. According to the invention, the bridge detection method addresses the inconvenience of on-site detection and poor precision of current flexibility detection devices, overcomes the inability of environment vibration to identify deep parameters of the structure and the high difficulty of impact vibration on-site detection. The detection method not only can obtain static deformation of the structure, and can obtain rigidity information of the structure, thus providing effective evaluation of the safety of the bridge structure.

The invention relates to the technical field of single levitation chassis testing for a maglev train, in particular to an electromechanical coupling vibration test device for the maglev train. The device comprises a primary platform for simulating ground support, a secondary platform which is positioned above the primary platform and simulates a track beam, and a track beam rigidity adjusting system for connecting the primary platform and the secondary platform, wherein the track beam rigidity adjusting system and the secondary platform supported by the track beam rigidity adjusting system form simulated maglev train track beam characteristics; and a hydraulic shock excitation system which applies excitation to the primary platform so as to simulate geometrical irregularity of track ground is fixed under the primary platform. The defects of the simplified single-point test or complete-vehicle debugging test for the conventional maglev train are overcome, the complex laboratory simulation of levitation control, elastic beam and coupling vibration environment of a levitation chassis mechanism for the maglev train is realized, the gap in research of key technology for domestic and overseas maglev trains is filled, and a scientific test means is provided for design of a levitation control system of the maglev train, the track beam characteristics and design of the mechanical structure of the levitation chassis.

The invention discloses a dynamic simulation test system for ensuring running safety of a train on a railway bridge under an earthquake. The dynamic simulation test system comprises a bridge model and a train model, wherein a supporting frame component for supporting the bridge model and adjusting an inclination angle and a horizontal position of the bridge model is arranged at the bottom of the bridge model; track boards are paved on the bridge surface of the bridge model; train tracks for guiding a running route of the train model and central tracks for preventing the train model from falling off are paved on the track boards; the train tracks are parallel to the central tracks; the bridge model comprises a first supporting section for adjusting a preset speed of the train model through the inclination angle, a test section for performing a train-bridge coupling vibration test and a second supporting section for stopping the running of the train model according to the inclination angle; the first supporting section and the second supporting section are respectively connected to two ends of the test section. The weak action of the bridge, which is caused by the upper train, and strong action of bridge vibration, which is caused by a vibration table, are mutually coupled to realize a train and earthquake mixing simulation system.

The invention discloses an axle safety health assessment system and method based on axle coupling analysis, and relates to the field of bridge health monitoring. The axle safety health assessment system comprises an axle coupling analysis subsystem, a bridge health situation assessment system and a traffic safety assessment system, wherein the axle coupling analysis subsystem utilizes actual measurement data of a bridge health monitoring system to correct a bridge finite element model to obtain a bridge benchmark finite element model, and the bridge benchmark finite element model is used for carrying out axle coupling vibration analysis calculation to obtain a theoretical calculating value under an equal condition of the actual measurement data of the bridge health monitoring system; the bridge health situation assessment system compares the actual measurement data with the theoretical calculating value to assess the bridge health situation; the traffic safety assessment system utilizes the theoretical calculating value obtained through the axle coupling vibration analysis calculation and actual measurement bridge vibration data to assess a situation of the traffic safety. The theoretical data and the actual measurement data are combined to realize a purpose that the bridge health and the traffic safety are quantitatively analyzed and assessed, and the reliability of an assessment result is improved.

The invention discloses a railway vehicle ramp operation comprehensive performance evaluation method, and the method comprises the steps: employing a train-train when the comprehensive performance ofa train in ramp operation is evaluated; The invention discloses a track three-dimensional coupling dynamic performance analysis model. the longitudinal direction of the vehicle structure and the railstructure is comprehensively considered; The coupling vibration influence in the transverse direction and the vertical direction evaluates the climbing performance, the operation safety performance, the operation stability performance, the riding comfort performance and the system energy consumption condition when a train passes through a long and large ramp, and the calculated result can comprehensively reflect the comprehensive performance of the train in operation on the ramp.

The invention discloses a maglev vehicle unilateral track coupling vibration test bed device. The test bed device comprises a ground installation foundation platform, a suspension electromagnet bracket and an air spring arranged at the middle of the upper beam of the suspension electromagnet bracket. The test bed device also comprises a vibrating beam system, an electromagnetic exciting system, a suspension control system and a suspension quality simulation system, wherein the vibrating beam system comprises a vibrating beam and a stator; the stator is fixed in the middle position of the lower surface of the vibrating beam; the electromagnetic exciting system is connected with the end part of the vibrating beam; the suspension control system comprises a suspension controller, a suspension sensor and a suspension electromagnet; the suspension electromagnet is arranged on the lower beam of the suspension electromagnet bracket; and the suspension quality simulation system is connected with the suspension electromagnet bracket through a spring device. By adopting the test bed device, the suspension control-bridge dynamic irregularity-suspension frame coupling vibration laboratory simulation of the maglev vehicle can be realized.

The invention discloses a TBM hobbing cutter stress online real-time monitoring apparatus and monitoring method. The apparatus comprises a support cushion block, an upper compaction block, a strain gauge, a strain instrument, a wireless emission module, a wireless receiving module and a monitoring computer. According to the monitoring method, by use of strain data of the support cushion block, obtained by the apparatus, through the monitoring computer, by use of a hobbing cutter system vibration differential equation established through a hobbing cutter vertical and swing-direction coupling vibration mechanical model, stress of a hobbing cutter during work is calculated, such that work personnel can monitor the stress condition of the hobbing cutter in real time and adjust driving parameters based thereon, damage is reduced, vibration is mitigated, and the driving efficiency is improved.

The invention discloses an electric spindle semi-active vibration control test stand, a system and an electric spindle control method, wherein the electric spindle semi-active vibration control method comprises the following steps: through a processor, an electric spindle torsional coupled vibration signal is separated by using an experience modal decomposition and Hilbert transformation method so as to obtain a test frequency and a test phase; through an electric spindle intensive parameter equivalent mechanical model and the design parameter of the electric spindle system, the theory frequency and theory phase of the bending vibration and the torsional vibration of the electric spindle are obtained; through a force synchronizing vibration control model, the testing frequencies of the bending vibration and the torsional vibration of the electric spindle are combined, the test phase, the theory frequency and the theory phase are combined, so that a first pulse-width modulation (PWM) signal of a magneto-rheological absorber used for controlling the bending vibration and a second PWM signal of the magneto-rheological absorber used for controlling the torsional vibration are generated respectively. Therefore the bending vibration and the torsional vibration of the electric spindle can be synchronously controlled.

The invention provides an accurate controllable non-contact test piece rotary magnetic field fatigue excitation and vibration test device. The device comprises a vibration damping insulation clamp, a vibration damper, a dynamic balance device, a vibration exciter, an electromagnetic piezoelectric coupling vibration sensor, a test station, a transmission device and an accurate control device. The excitation and vibration test device is suitable for rotary test pieces and especially suitable for vibration characteristic researches on a wind power blade, an engine, a turbine blade, a helicopter rotor and a tail rotor blade, the excitation and vibration test device can vividly simulate vibration fatigue states of rotary test pieces respectively under conditions of 360-DEG all directions, same rotating speed and different excitation forces, same excitation force and different rotating speeds, and different rotating speeds and different excitation forces, the excitation and vibration test device can monitor related vibration characteristic parameters such as the excitation force, the vibration displacement, the vibration speed and the vibration acceleration continuously, and the excitation and vibration test device is suitable for vibration fatigue characteristic analysis on stationary test pieces.

The invention discloses a giant magnetostictive longitudinal-torsional coupled vibration ultrasonic transducer which comprises a transducer main body, a coil support and a shell, wherein the shell comprises a top plate, a base plate as well as a plurality of giant magnetostictive bar installation pipes, a plurality of giant magnetostictive bars, a first magnetic conduction sheet, a second magnetic conduction sheet, an upper cover plate, a lower cover plate, a fastening element, a magnetic element and a coil; the plurality of giant magnetostictive bar installation pipes are arranged between the top plate and the base plate; the plurality of giant magnetostictive bars are respectively installed in the giant magnetostictive bar installation pipes; the coil is reeled on the coil support; the coil and the fastening element are coaxial; and an ultrasonic frequency alternating current is introduced into the coil so as to generate an alternating magnetic field to drive the giant magnetostictive bars to generate longitudinal-torsional coupled vibration. According to the giant magnetostictive longitudinal-torsional coupled vibration ultrasonic transducer provided by the embodiment of the invention, parts are reduced; and the structure of the transducer is simplified, so that the structure of the transducer is compact, and the ultrasonic energy can be transmitted efficiently.

The invention discloses a three-machine-driving double-mass-body subresonance self-synchronizing probability constant thickness screen which is mainly applied to industrial and mining enterprises. Double mass bodies of the three-machine-driving double-mass-body subresonance self-synchronizing probability constant thickness screen are of a novel structure, one mass body drives the other mass body, so that a sensitive subresonance system is formed, and the overall mechanical performance is affected by variation of loading capacity. Compared with a single-mass-body system, a double-mass-body system can achieve the same effect by smaller power. Compared with a traditional single-stage system and a double-stage system, the driving frequency is improved, screening is more complete, and the working efficiency is further improved. Three different coupling vibration exciters have the same rotating direction, so that self-synchronous driving is achieved, and energy saving is achieved. Through application of a probability constant thickness screen theory, probability quick layering, screen blockage preventing and constant thickness high-efficiency screening of materials on a machine body are achieved, the screening efficiency and the yield are improved, and large-scale screening machines are achieved. Three-machine self-synchronizing driving is adopted to improve the uniform distribution of exciting force on a screening machine.

The invention discloses a testing device for the test table which stimulates the motion of the bent-axle rotator-bearing system, and comprises a drive device comprising a motor and a reducer, a supporting device, a tested bent axle, a loading device and a signal measuring device. The invention has the advantages of being able to study the coupling action of the bent-axle rotator-bearing system dynamic behavior of high-power, low speed and semi-integrated marine diesel and the vibration problem when the bent axle rotating separately and being processed, which also can research the dynamics problem when working with a connecting prod and a piston; besides, through testing, the invention discloses the situation that the radial unbalanced quality pushing can lead to the coupling vibration of bent axle. The invention can help people to have more perfect understanding to the bent-axle rotator-bearing system and build more accurate correlative dependence relation among each design index for multi-cylinder diesel, which provides guidance on the theory of improving the performance of diesel further.

The invention belongs to the technical field of torsional vibration safety estimation of a turbo generator unit, and particularly relates to a torsional vibration fatigue life loss estimation method and system for generator unit shaft system-vanes. A generator unit shaft system-vane coupling vibration model is built according to the actual structure of generator unit shaft system-vanes; the electromagnetic torque of a generator and the steam moment of a turbine are calculated by monitoring the three-phase current, voltage and rotation speed of the generator; vibration response, relative displacement between mass blocks of the model, the dangerous section torsional stress response of a shaft system and the dangerous point stress response of vanes are calculated; the fatigue life loss of a rotor and a vane dangerous point is calculated according to a torsion S-N curve of rotor materials and an S-N curve of vane materials. The torsional vibration fatigue life loss estimation method and system for the generator unit shaft system-vanes builds a vane displacement-stress relationship, can accurately calculate the stress of the vane dangerous point through the peripheral displacement of the vanes, and can accurately carry out torsional vibration fatigue life loss estimation on the shaft system and the vanes in time when the generator unit has torsional vibration.

The invention discloses a large-amplitude translation / rotation-coupled vibration experiment device loaded under the control of force and torque. The device comprises a portal frame, vibration structure plates, loading springs, a three-way acceleration sensor and a displacement sensor, wherein the portal frame includes two supporting columns, a top cross beam, a bottom cross beam and a bearing platform used for fixing a damper and disposed between the top cross beam and the bottom cross beam, the vibration structure plates include an upper-part vibration structure plate and a lower-part vibration structure plate, the loading springs include a horizontal loading spring and a vertical loading spring, the three-way acceleration sensor is arranged on the upper-part vibration structure plate, and the displacement sensor is arranged between the upper-part vibration structure plate and the top cross beam. The experiment device of the invention is strong in applicability and simple in operation; and the device is applicable to experimental simulation of various ocean engineering structures, ships and submarines, high-speed trains, super-large-span building structures, military and civil aircrafts, spacecrafts and the like.

The invention discloses a high-speed bogie dynamic design method based on an anti-snake movement frequency band energy absorption mechanism. A high-speed train is viewed as a closed-loop system, and advanced correction is conducted on an instable snake movement oscillating phenomenon of a bogie by means of an adaptive control mode. According to an anti-snake movement matching principle, an optimal distribution theoretical scheme of the bogie is determined. A novel anti-snake movement damper using a double-flow control principle is selected and used, a technical implementation mode of the novel anti-snake movement damper is worked out by using an anti-snake movement series stiffness judging principle, anti-snake movement is restrained softly, or an expansion bag is added into an auxiliary cavity. The dynamic performance assessment should have three stable features of a high-speed bogie. In order to lower lateral coupling strength, a train body model state form is reorganized to analyze aluminum alloy train body lateral coupled oscillation inherent features, the lateral stiffness of a suspension point is determined according to a harmonic vibration reduction mechanism, according to a structural damping constraint effect, the damping optimum value of rubber proportions is selected, a bolt pre-tightening or deadweight wedge-caulking rubber suspension mode is used, and therefore desired stable robust performance of bogie optimal match is achieved.

The invention discloses a vehicle-bridge-storm flow coupling vibration analysis method for a road-railway bridge. According to the method, a vehicle subsystem, a bridge subsystem and a storm flow coupling field subsystem serve as a unified system by adopting a large system thought. According to static and dynamic interaction among the subsystems and a displacement coordination relationship betweenthe vehicle subsystem and the bridge subsystem, a vehicle-bridge-storm flow coupling vibration equation of the road-railway bridge is established; and by adopting a separated iterative method, dynamic responses of the vehicle subsystem and the bridge subsystem are solved, thereby evaluating running safety and comfort of vehicles and trains passing the road-railway bridge under the action of a storm flow coupling field. The dynamic effects of the vehicles and the trains can be considered at the same time; the static and dynamic effects and the aeroelastic and hydroelastic feedback effects of the storm flow coupling field on the vehicle subsystem and the bridge subsystem can be considered at the same time; and an effective method is provided for driving safety evaluation of the cross-sea road-railway bridge.

The invention relates to a joint simulation method for a vehicle-road coupled vibration system. The method comprises the following steps of S1, building a vehicle dynamics model according to a dynamics equation; S2, building a pavement dynamics model according to a structural mechanics finite element equation; and S3, loading the vehicle dynamics model in the pavement dynamics model to generate a tire-pavement contact model, and finishing dynamics analysis of the vehicle-road coupled vibration system. According to the method, joint modeling of the vehicle-road coupled vibration system is realized by adopting efficient engineering software Matlab and Ansys; and by taking Matlab as control software and performing secondary development on Ansys, joint simulation of Matlab and Ansys is realized, and dynamics analysis of the vehicle-road coupled vibration system under complex road and vehicle conditions is finished.

The invention belongs to the field of experimental simulation technologies, in particular to a method for testing thermal-elastic coupled vibration characteristics in a friction and sliding process of a variable speed friction plate. The method specifically comprises the steps of testing friction moment characteristics, rotational speed variation characteristics and thermosetting coupling characteristics in the friction and sliding process of a friction element, and then acquiring vibration characteristics. The method can provide theoretical support for the structural strength simulating calculation and optimization design of the friction element, obtains thermal-elastic coupled vibration characteristics of a friction pair during the combination / separation process through a special real-time data processing technology, can remove strong interference signals, can obtain the relation between the moment characteristics and rotational speed variation through accurate circular frequency vector and quadratic integral calculation, further synthesizes results of temperature field analysis and vibration vector spectral analysis, and can obtain the thermal-elastic coupled vibration characteristics. The experimental testing method provided by the invention is simple, practical, and high in precision of test results.

The invention provides a large amplitude free vertical and torsional coupling vibration wind tunnel test device, which belongs to the technical field of free vertical bending and torsional coupling vibration wind tunnel test devices. Gear blocks are fixed on both ends of a crossbeam. Screws, the crossbeam and the gear blocks are fixed on both ends of a model and carry out vertical bending and torsional coupling vibration with the model to drive the meshed toothed plate and a slider fixing the toothed plate to translate up and down reciprocally along a guide rail fixed on the ground. A vertical spring connected with the slider provides torsional and vertical rigidity for a model suspension system. The spring is simply vertically linearly deformable without lateral tilting, which ensures the vertical linear torsion and vertical bending rigidity of the model. Lateral freedom is effectively constrained. The device can realize sharp free vertical bending and torsional coupling vibration of the model. The spring is simply vertically telescopically deformable without lateral tilting. The problem that a spring in a traditional free vibration test device obviously tilts and cannot ensure the linear torsional rigidity is solved. Lateral vibration of the model is constrained.

The invention provides a device for reducing thrust and vibration at pipeline ends, which comprises a movable floater supporting component and a buffer chamber. The movable floater supporting component supports a movable table through supporting springs and an air spring, the height of the air spring is controlled by an air spring height control component, the movable table is connected with the buffer chamber through a slide chute, and the buffer chamber is connected with an external vertical air inlet pipeline and an external engine inlet duct. According to the technical scheme, physical isolation of combined load affection between the air inlet duct and the external air inlet pipeline is realized. During operation, the movable table moves axially, the rigidity of the air inlet end of the pipeline on the movable table is close to zero, affection of the external air inlet pipeline to a measurement system is avoided, and the device can be suitable for sites having requirements for thrust measurement of testing targets such as the same type gas or liquid medium. According to the testing results, the device can evidently reduce affection of pipe end thrust and coupled vibration under composite load action and the requirement on thrust measurement can be met.

An ossicular prosthesis is described which includes an elongated prosthesis member having a proximal end and a distal end. A cochlea striker mass is at the distal end of the prosthesis member and includes an outer striking surface for coupling vibration of the striker mass to an outer cochlea surface of a recipient patient. A locking clamp is at the proximal end of the prosthesis member and includes a clamp strap having a fixed end and a free end, and a locking head at the fixed end of the clamp strap which has a strap opening for insertion of the free end of the clamp strap. The clamp strap passes around an ossicle of the middle ear in a closed loop and is fixedly engaged by the locking head such that acoustic vibration of the ossicle is coupled by the prosthesis member to the cochlea surface.

The invention discloses a vehicle-track-bridge coupled vibrationfrequency domain model with middle and high frequency response output. The model selects vehicle-track-bridge coupled vibration simulation prediction parameters to be inputted into the vehicle-track-bridge coupled model, based on a vehicle dynamics equation and the vehicle-track-bridge coupled model to solve a wheel admittance matrix and an orbital admittance matrix respectively, lastly substitutes the solved dynamic wheel rail force into the vehicle motion equation and a track-bridge coupling model motion equation as the excitation source of vehicle model and track-bridge coupling model, and further solves the frequency domain dynamic response of the vehicle, track and bridge structures caused by dynamic wheel rail force. The vehicle-track-bridge coupled vibrationfrequency domain model with middle and high frequency response output can unveil the mechanism and influence law of vibration and energy generation and transmission of vehicle-rail-bridge, and provides theoretical basis for taking targeting measures to reduce vibration and noise.

The invention relates to a simulation analysis platform for thermally-induced micro-vibration response of a satellite-borne flexible accessory, and belongs to the technical field of high-precision spacecraft design as well as dynamical simulation and control. The simulation analysis platform for thermally-induced micro-vibration response of the satellite-borne flexible accessory comprises a data inputting and modeling module, an on-orbit thermal analysis module, an equivalent thermal load derivation module, a high-precision modal analysis module, a high-precision vibration response analysis module and a post-processing module, all of which are connected in a sequence; the output of the previous module serves as an input of the next module; and the analysis platform carries out analysis and simulation research on thermal vibration of an engineering-practical large-scale satellite-borne flexible accessory and research on corresponding software for calculation, and realizes the purpose of rapidly and efficiently obtaining the thermally-induced micro-vibration of large-scale flexible components and coupling vibration response between the components and a satellite. Meanwhile, the simulation analysis platform can promote engineering application, testing and verification of a thermal deformation and thermally-induced micro-vibration simulation technology of the large-scale satellite-borne flexible components, can drive progress of related support technical research and can accumulate a technological base for subsequent research of novel satellite types.

The invention provides a test method for natural frequency of a blade of an integral blade disc, which combines a damping vibration attenuation technology and a modality identification technology, expands application range, and specifically comprises the steps of a fixed stage, a damping stage, joint point division, vibration test and data verification. The test method for the natural frequency of the blade of the integral blade disc has the advantages of being high in test precision, wide in frequency range and capable of removing coupling vibration of the blade of the blade disc.

The invention discloses a device for measuring and controlling coupled vibrations of multi-flexibility cantilever beam based on single-axis air flotation table, and a method thereof. The device comprises a cantilever beam body, a supporting driving component and controlling components; the cantilever body comprises four cantilever beams, which are all flexibility beams and are all provided with a piezoelectric ceramic sensor, a piezoelectric ceramic driver, and an acceleration sensor. The supporting driving component comprises the single-axis air flotation table, an air supply loop, a servo motor, and a servo motor support. The four cantilever beams are arranged on a supporting rotary table of the single-axis air flotation table through a support, the air supply loop is connected to the single-axis air flotation table, the servo motor support is fixedly connected to the supporting rotary table of the single-axis air flotation table, and the servo motor is fixedly connected to the servo motor support. The controlling components are connected to the piezoelectric ceramic sensor, the piezoelectric ceramic driver, the acceleration sensor, the air supply loop, and the servo motor respectively. The device for measuring and controlling coupled vibrations of multi-flexibility cantilever beam based on single-axis air flotation table is capable of detecting in real time the flexible vibration mode of the flexibility cantilever beam and inflicting control on the flexible vibration mode.

The invention provides a bridge impact coefficient optimization method based on the parameter identification technology, solving the problems in the calculation of impact coefficient and the optimization of impact coefficient sensitivity in stochastic dynamics, which can reduce the damage of bridge. The method is carried out in this manner: (1) defining a vehicle model, (2) deriving the equation of motion MU<..>+CU<.>+KU=F<g>+F<w>, according to the D'Alembert's principle; using the PIM method to solve deterministic response and using the PEM to calculate random response, U(t)=integral H(t-[tau], t)(F<g>([tau])+F<w>([tau])) differential [tau], t belongs to (0, t). The invention provides an effective optimization method for non-stationary random vibration of a vehicle-bridge coupling system, and improves comfort and safety of the vehicle and the bridge. The method of the invention has both accuracy and efficiency, and can provide better technical support for vehicle-bridge coupling vibration sensitivity analysis and optimization. The computational time required by the PEM-PIM numerical method is more than ten times that of the Newmark method when the computational accuracy is the same, and the method of optimizing the sensitivity of the self-identification design variables is proposed.