89 results about "Damping ratio" patented technology

The invention discloses a wind turbine generator blade damage judgment method and detection system based on voiceprint detection, and belongs to the technical field of wind turbine generator blade detection. The damage judgment method comprises the following steps: acquiring environmental parameters of a wind power plant, and establishing a sound velocity correction model based on the environmental parameters; acquiring a blade resonance sound signal, and correcting the blade resonance sound signal based on the sound velocity correction model to obtain a blade resonance sound signal with a high signal-to-noise ratio; performing FFT spectrum analysis on the blade resonance sound signal with the high signal-to-noise ratio, identifying the peak position of the first three-order natural resonance frequency of the blade, and performing analysis to obtain the current modal frequency, damping ratio and sub-band energy distribution entropy value of the blade; historical baselines of the modal frequency, the damping ratio and the sub-band energy distribution entropy of the blade in the healthy state are obtained, and the modal frequency offset, the damping ratio change rate and the acoustic impedance spectrum entropy of the blade are obtained; and wind turbine generator blade damage determination is carried out by using a high-precision time difference detection technology.

The invention belongs to the field of structural modal identification, and particularly relates to an automatic modal parameter identification method based on a multi-scale space, which comprises the following steps: collecting a vibration data sample from a target structure, the vibration data sample comprising an acceleration signal of the structure; selecting power spectrum calculation parameters including a window function and a fast Fourier transform (FFT) length; performing frequency spectrum estimation on the acceleration signal by using interpolation power spectrum estimation to obtain frequency spectrum data; analyzing the spectrum data by using a multi-scale space algorithm, and detecting a peak value in the spectrum data to obtain a peak value frequency; through a frequency domain decomposition method, according to the peak frequency, modal parameters of the structure are calculated, the modal parameters comprise the modal frequency and the damping ratio, interpolation power spectrum estimation and a multi-scale space algorithm are innovatively combined, automatic and accurate identification of the modal parameters is achieved, and the identification precision and efficiency are remarkably improved.

The invention discloses an ultrasonic welding quality online detection system and method, and belongs to the technical field of laser non-contact measurement. According to the invention, the laser vibration measurement probe is rigidly coupled to the welding head to construct a follow-up-common-optical-path measurement unit, so that synchronous acquisition of vibration signals with zero mass loading is realized; further extracting an attenuation section after welding is finished from the signal, and inverting an equivalent modal damping ratio representing an interface energy dissipation state based on an exponential attenuation model; meanwhile, multi-dimensional physical indexes such as an energy transfer efficiency index Itrans and an input stability index Iin are calculated, and in combination with an energy absorption state index, collaborative fusion is carried out through a weighted fusion formula to obtain a comprehensive quality score; and finally, realizing quality attenuation early warning based on time sequence trend analysis of a scoring sequence. On-line sensing of the deep dynamic state in the welding process is achieved, the early defect recognition sensitivity and the system anti-interference capacity are remarkably improved, and the predictive maintenance capacity of quality degradation is achieved.

The invention belongs to the technical field of low-frequency vibration control, and discloses a low-frequency low-damping tuned mass damping device which is mainly composed of a rigid support, a first sling, a rotating arm, a cable hole, a first arc guide groove, a second arc guide groove, a lock pin, a second sling, a first mass block, a spring, a second mass block and a damping element. The flexible suspension rotation replaces the bearing or ball screw support, so that the damping is obviously reduced; the long rotating arm is combined with the equivalent large-diameter arc guide groove, so that the low-frequency low-damping tuned mass damping device can achieve large vertical displacement at a small rotating angle, and damping is reduced. The low-frequency low-damping tuned mass damping device innovatively adopts double-mass-block configuration, so that static force borne by a spring is generated by mass difference, and static deformation of the spring is remarkably shortened. According to the method, low-frequency operation can be achieved under the condition that the space is limited, the low-damping characteristic is kept, it is guaranteed that the requirement for the optimal damping ratio is met, and therefore a new technical approach is provided for control over low-frequency vortex vibration of a large-span bridge.

The invention provides a bridge vortex-induced vibration and flutter control TMDI parameter optimization method, which comprises the following steps of: according to a selected inertia mass ratio, obtaining optimal values of parameters under a control target by adopting a GBO optimization algorithm, wherein the optimal values are a TMDI mass ratio, a frequency ratio and a damping ratio; according to the optimization algorithm, the target function Fs converges to the minimum individual, namely the minimum TMDI mass ratio, and the minimum TMDI mass ratio and the corresponding optimal parameter, namely the optimal combination parameter. The invention further provides equipment, a storage medium and a program product. Compared with the prior art, the method has the advantages that the most economical TMDI optimization parameters can be obtained while effectiveness and robustness are considered.

This invention discloses a method for correcting the phase difference between aerodynamic and displacement signals in wind tunnel tests based on self-excited vibration characteristics. The method includes: independently acquiring wind pressure and vibration displacement signals from the structural surface; integrating the wind pressure signal to obtain the self-excited aerodynamic time history; identifying the vibration frequency and the total system damping ratio from the displacement signal; filtering the aerodynamic time history to extract the fundamental frequency component; establishing an analytical relationship between the aerodynamic out-of-phase component coefficient and the total system damping based on the structural dynamic equilibrium principle; and iteratively shifting the aerodynamic time history using the displacement signal as a reference until the out-of-phase components satisfy the analytical relationship, thereby determining and correcting the system delay. This invention also discloses a system and storage medium for correcting the phase difference between aerodynamic and displacement signals in wind tunnel tests based on self-excited vibration characteristics. This invention requires no additional hardware and can accurately compensate for electrical triggering and physical transmission delays, effectively improving the reliability of aerodynamic parameter identification.

The application discloses a new energy base phase modifier synchronous instability analysis method and system, and belongs to the technical field of power system stability analysis. The method comprises the following steps: obtaining a training data set covering multi-dimensional power grid parameters and fault scenes, calculating dominant degree factors based on the coupling dynamic index of inverters, and dividing multiple dominant degree factor intervals to represent the control dominance of different types of inverters; a risk guardrail set containing a power coupling index and a damping ratio change amount is constructed, and a differentiated threshold is set for each interval; the control parameters of the inverters are extracted and a candidate boundary line set is generated, the performance of the candidate boundary line set is evaluated through transient simulation, the priority value is calculated by comprehensively considering the deployable proportion, the time benchmark ratio and the safety coefficient, and the optimal target boundary line is selected; finally, the target boundary line parameters are mapped into adaptive control gears, and the coordinated control of the phase modifier and the inverter is realized in combination with the real-time risk state, so that the synchronous instability risk is effectively inhibited.

The present application belongs to the technical field of low-frequency vibration control, aiming at the problems of high damping ratio, instability, low vibration control efficiency and unsuitable for large-scale engineering of existing inertial damper, a low-damping tuned inertial damper device is provided, which provides the possibility for the whole system to realize the required optimal damping ratio, and further efficiently controls low-frequency resonance. Unlike traditional rigid support and transmission mode, the device adopts economical, reliable and convenient flexible suspension support and transmission mode to realize low frequency and stable low damping of the system. The flexible support part and the rigid inertial device are in contact transmission around, which eliminates the high damping caused by high energy consumption due to instability caused by friction and collision in traditional inertial tuned mass damper, so as to ensure that the large inertial system realizes stable low damping ratio, meets the needs of realizing optimal control effect, and is directly applied to large engineering structure resonance control.

The present application relates to building energy dissipation and shock absorption technical field, disclose a kind of based on optimal additional damping ratio viscous damper parameter design method, including the following steps: the first-order natural frequency of non-damping structure is calculated;The vertex displacement amplitude of structure under the action of frequently occurring earthquake is calculated;The inter-story displacement amplitude of the i floor of structure arranged with damper and the corresponding inter-story displacement amplitude average are calculated;The first-order equivalent modal stiffness of viscous damper connecting component is calculated;The traversal numerical solution of damper damping index is calculated;The value of damping coefficient when additional damping ratio obtains maximum is calculated and so on step.The present application can calculate the specific value of viscous damper damping coefficient and damping index when additional damping ratio obtains maximum according to the basic parameter of structure, and the corresponding maximum value of additional damping ratio is calculated, and it has important significance to damage control and optimization design of damper parameter of viscous damper shock absorption structure under the action of earthquake.

The invention discloses a multiple-input-multiple-output bridge modal parameter identification method and device based on a corrected periodogram method power spectrum, and the method comprises the steps: obtaining a section of multi-point input excitation and multi-point output response, and equally dividing the excitation and response data according to the dimension of an excitation vector; the equant excitation and response data are substituted into a response power spectrum matrix calculation formula for separating excitation, singular value decomposition is carried out on the obtained matrix to obtain a maximum singular value curve and a singular vector, the frequency corresponding to the peak value of the curve is the inherent frequency of the bridge, the corresponding singular vector is the vibration mode of the bridge, and the maximum singular value curve is obtained. The frequency corresponding to the half of the peak value of the curve is a half-power point, and the half-power point is substituted into a damping ratio calculation formula to obtain the damping ratio of the bridge. And substituting the damping ratio, the vibration mode and the inherent frequency into a vibration mode scaling coefficient calculation formula to obtain the vibration mode scaling coefficient of the bridge. In the bridge operation modal parameter identification process, the problem that an excited autopower spectrum ill-conditioned condition is difficult to invert is solved, and the identification precision of the bridge modal parameters is improved.

The invention discloses a power system oscillation parameter identification method based on improved TVF-EMD, and the method comprises the steps: carrying out the preprocessing of an original PMU data stream, calculating a local cut-off frequency LCF through B-spline approximation, solving a signal local mean value through B-spline approximation, completing the time-varying filtering empirical mode decomposition, namely TVF-EMD decomposition, screening an effective IMF based on a correlation coefficient after the verification of a stop criterion, and carrying out the recognition of the oscillation parameter of a power system. Extracting an instantaneous frequency and a damping ratio through the TKEO; the method combines TVF-EMD with TKEO, can accurately estimate the modal parameters of the power system under the normal operation condition, including frequency and damping ratio, has robustness for the instantaneous mode characteristics in the power system under the condition of low calculation complexity, reduces the problems of modal aliasing and discontinuity easily occurring in the traditional EMD method, and improves the reliability of the power system. The method provides better performance in the aspects of predefined parameters and time-varying cut-off frequency, and is suitable for analysis of non-stationary signals.

The invention relates to the technical field of earthquake resistance of bridge engineering, and particularly discloses a railway beam bridge damping system based on metal damper coordination and a design method.The railway beam bridge damping system adopts direct displacement design based on equivalent linearization and comprises the steps that firstly, shock insulation displacement and an initial equivalent damping ratio are set as design parameters; the design displacement target is achieved within the reasonable range of the two parameters, accurate calculation can be conducted according to specific structural requirements, blind accumulation only based on the number of existing dampers in previous design is avoided, and design pertinence and scientificity are effectively improved. On the premise that different metal dampers are combined, the independent design of the equivalent damping ratio and the equivalent rigidity is achieved, the flexibility of the damping design is improved, the damping design of a common railway beam bridge is optimized, and the cost of the damping device is reduced.

The invention provides a power distribution network harmonic instability critical damping dynamic early warning method and system. The method comprises the steps that harmonic voltage and harmonic current of key nodes of a target power distribution network are acquired every first preset time; identifying the harmonic voltage and the harmonic current according to a first preset rule so as to obtain equivalent harmonic impedance under a preset harmonic frequency according to an identification result; calculating a system damping ratio corresponding to a preset harmonic frequency according to the equivalent harmonic impedance; judging whether the system damping ratio is smaller than or equal to a preset damping ratio threshold value; and if the system damping ratio is smaller than or equal to the preset damping ratio threshold value, generating a harmonic instability early warning signal. According to the invention, the accuracy and practicability of early warning can be effectively improved.

The application relates to an electromagnetic damping vibration damper, which comprises a wire clamp, a sleeve, permanent magnet hammers and springs. One end of the sleeve is fixedly connected with the wire clamp, the inside of the sleeve is provided with a buffer cavity, and the inner wall of the buffer cavity is entirely covered with an eddy current copper plate. The permanent magnet hammers are arranged in the buffer cavity along the axial direction of the sleeve, the permanent magnet hammers can slide along the axial direction of the sleeve, and a working gap is arranged between the permanent magnet hammers and the eddy current copper plate. One end of the spring is fixedly connected with the permanent magnet hammer, and the other end is fixedly connected with the permanent magnet hammer or the end of the buffer cavity. Four permanent magnet hammers and two adjacent springs are matched to form four groups of electromagnetic energy dissipation units, the natural frequencies of the four groups of electromagnetic energy dissipation units are F1, F2, F3 and F4, and the damping ratio of the four groups of electromagnetic energy dissipation units is between 0 and 1. Each group of electromagnetic energy dissipation units corresponds to an independent natural frequency, four discrete resonance frequency points are formed, and the core frequency band 0-150Hz of the overhead transmission line wind vibration is covered.

The invention relates to the technical field of unmanned aerial vehicle calibration, in particular to an unmanned aerial vehicle holder calibration method and device and electronic equipment, and the method comprises the steps: controlling a frame shaft of a holder to enter a free state; initial angular displacement is applied to the frame shaft in the free state, so that the frame shaft is subjected to free damped oscillation; acquiring a time-varying attenuation response data sequence of the angular displacement of the frame shaft in free attenuation oscillation; fitting the attenuation response data sequence with a preset system model, wherein the system model comprises kinetic parameters used for representing the rotational inertia and the damping ratio of the frame shaft, and constant offset parameters used for representing the zero deviation of the angle sensor; and according to a fitting result, calculating a numerical value of the constant offset parameter as a zero calibration value, and driving a motor of the holder according to the zero calibration value, so that the frame shaft rotates and is locked in a calibrated zero posture. According to the method, the calibration process is simplified, and errors caused by manual observation or dependence on unstable reference are avoided.

A kind of operating condition under rotating electric machine inherent frequency calculation method discloses a kind of operating condition under rotating electric machine inherent frequency acquisition method, belong to motor structure modal parameter online identification technical field.Method includes: in stator tooth portion uniform distribution N≥4 one-way vibration sensor;Motor is under load and vibration signal is synchronously collected;Signal zero-phase band-pass filtering;The correlation function of reference point and response point is calculated, and complex modal modeling is complex exponential series;Through single-sided mutual power spectrum transformation and multiple starting time sampling matrix equation is constructed, coefficient vector is obtained by SVD solution;Root is sought by coefficient and constructs characteristic polynomial, mapping obtains system continuous pole, and then simultaneously output inherent frequency and damping ratio.The whole process does not need to stop, does not need to add excitation, noise resistance is strong, frequency identification error is less than 1%, provides modal data under real boundary condition for motor NVH optimization and structural modification.

The invention discloses a bridge damping ratio rapid identification method based on a static detection vehicle, and relates to the technical field of bridge structure vibration tests.The method comprises the steps that the detection vehicle statically stops at the midspan position of a bridge to be detected, the bridge is driven away after being excited by a passing vehicle to vibrate, and the acceleration response of the detection vehicle in an attenuation section is collected; establishing an attenuation section dynamic model of the detection vehicle-bridge coupling system; constructing a two-degree-of-freedom joint state model, and internalizing an axle interaction force into a linear combination of system state variables; an effective attenuation section is extracted through signal preprocessing, and a dual anti-noise mechanism of a signal-to-noise ratio adaptive weight and a Huber weight is introduced; a section two-stage parameter identification strategy is adopted, the frequency and modal quality are locked firstly, and then the first-order damping ratio of the bridge is identified through fine scanning. The method only needs a single detection vehicle and an acceleration sensor, does not need to arrange a sensor on a bridge body, is high in anti-interference performance, is high in recognition precision, and is suitable for the rapid inspection of small and medium span bridges.

The invention discloses a pool vibration isolation and noise reduction design system based on dynamic characteristic analysis. The system comprises a sensor array, a data acquisition and preprocessing module, a dynamic characteristic analysis module, an active actuator array, an underwater acoustic control module and a central controller. Vibration and noise signals of a pool structure are collected in real time through a sensor, and dynamic characteristic parameters such as the inherent frequency and the damping ratio of the structure are analyzed online through algorithms such as random subspace recognition; based on the parameters, the central controller respectively drives the actuator array and the underwater secondary sound source by adopting a self-adaptive control algorithm and an acoustic active control algorithm to generate a reverse acting force and an anti-noise signal so as to cooperatively suppress structural vibration and underwater noise; according to the invention, the defect that the traditional static design is difficult to adapt to the dynamic change of the fluid-structure interaction system is overcome, intelligent and self-adaptive integrated cooperative control of vibration reduction and noise reduction is realized, and the control precision, stability and efficiency are remarkably improved.

The application discloses a kind of video vibration two-dimensional modal identification method and equipment based on depth completion pyramid, belong to structural vibration measurement and modal identification technical field;First, the depth image sequence in the two-dimensional vibration process of measured structure is obtained;The sparse depth image of depth image sequence is directionally depth completed to construct Gaussian pyramid, and depth completion pyramid is constructed in combination with the Gaussian pyramid of adjacent scale, and the target layer is selected for fusion reconstruction;Then, the reconstructed depth sequence is sequentially subjected to difference amplification, transposition compression and direct current removal processing to construct a unified input matrix;Then, the input matrix is subjected to PDD method and H-DMD method to extract natural frequency, damping ratio and modal shape from two dimensions of frequency domain and time domain;Finally, the decomposition results of PDD method and H-DMD method are jointly checked, and the modal identification result of the structure is output.The two-dimensional structural vibration modal result obtained by the method is improved in terms of parameter integrity, spatial continuity and physical consistency.

The invention discloses a broadband oscillation s-domain modal analysis method for a traction power supply system. The method specifically comprises the following steps: acquiring a topological structure and element parameters of an electrified railway traction power supply system; a single-input single-output s-domain (complex frequency domain) impedance model is formed based on a small-disturbance dq impedance model of power electronic interface loads or power supplies such as locomotive and single-phase converter interface new energy; forming a system s domain node admittance matrix Y (s); in a to-be-analyzed frequency band, performing s-domain scanning on the Y (s) to obtain a system oscillation mode; calculating a damping ratio and an oscillation frequency of the oscillation mode, and a participation factor of each node to the oscillation mode; the method is suitable for broadband oscillation stability analysis of any complex topology traction power supply system containing a single-phase voltage source type converter interface power supply (new energy, energy storage and the like) and an external power system power supply. The system does not need to be divided into an active system and a passive system, and compared with a state space model, the dimensionality is low, and the engineering feasibility is good.

The application belongs to the technical field of engineering structure detection data analysis, and discloses a bridge modal parameter identification method and device combined with vehicle dynamic weighing. First, the influence line of the bridge is tested and obtained, and the bridge response under the vehicle excitation is tested and obtained. The weight of the vehicle is obtained by fitting the bridge response and the influence line, and then the input excitation of the bridge is obtained. Then, the frequency response function matrix of the bridge is obtained by the input excitation and the output response. The maximum singular value curve and the singular vector are obtained by singular value decomposition of the frequency response function matrix of the bridge. The frequency corresponding to the peak value of the curve is the natural frequency of the bridge, and the corresponding singular vector is the vibration mode of the bridge. The frequency corresponding to the half peak value of the curve is the half power point. The damping ratio of the bridge is obtained by bringing the half power point into the damping ratio calculation formula. In the process of bridge operating modal parameter identification, the vehicle excitation is solved for the identification of the bridge modal, and the identification accuracy of the bridge modal parameters is improved.

The invention belongs to the technical field of engineering structure detection data analysis, and discloses a bridge modal parameter identification method and device combined with vehicle dynamic weighing, and the method comprises the steps: firstly, testing to obtain an influence line of a bridge, testing to obtain a bridge response of the bridge under vehicle excitation, and obtaining the weight of a vehicle through the fitting of the bridge response and the influence line; and the input excitation of the bridge is obtained. A frequency response function matrix of the bridge is obtained through input excitation and output response, a maximum singular value curve and a singular vector are obtained through singular value decomposition of the frequency response function matrix of the bridge, the frequency corresponding to the peak value of the curve is the inherent frequency of the bridge, and the corresponding singular vector is the vibration mode of the bridge; the frequency corresponding to the half of the peak value of the curve is a half-power point, and the half-power point is substituted into a damping ratio calculation formula to obtain the damping ratio of the bridge. In the bridge operation modal parameter identification process, the problem of bridge modal identification by vehicle excitation is solved, and the bridge modal parameter identification precision is improved.

The invention discloses a rotational inertia measurement method based on multi-source error compensation, and relates to a rotational inertia measurement method. The invention aims to solve the problem that systematic identification, modeling and multi-source error compensation are lacked in the prior art. By establishing the comprehensive error model and performing high-precision identification on the key parameters, the measurement precision of the rotational inertia is improved. The core principle of the method is that a comprehensive rotational inertia measurement model including a gravity pendulum effect error, an installation error and a parameter identification error is constructed, an oscillation period and a damping ratio are identified with high precision by adopting an advanced signal processing technology, and finally a more accurate rotational inertia value after compensation is obtained through calculation. The invention belongs to the technical field of precision measurement.

A method for detecting structural damage of a water turbine generator support, comprising: determining a knocking point and a response point on a water turbine generator support; arranging an acceleration sensor (7) at the response point; hammering the knocking point by means of an impact force bar (5); acquiring a signal detected by the acceleration sensor (7) and a signal detected by a force sensor (6) in the impact force bar (5); performing fitting on the basis of the signal detected by the acceleration sensor (7) and the signal detected by the force sensor (5), so as to obtain the inherent frequency, damping ratio and vibration mode of the support; and on the basis of the inherent frequency, damping ratio and vibration mode of the support, determining whether structural damage occurs to the water turbine generator support. Further provided is a system for detecting structural damage of a water turbine generator support.

The application discloses a bridge operation modal analysis method based on structural dynamics and Gaussian process fusion, and can be used for bridge structure health monitoring. Acceleration sensors are arranged at key positions of the bridge to collect vibration responses in an operation state; mode force power spectral densities of each mode are extracted through frequency domain analysis as external excitation strength indexes. The indexes are taken as Gaussian process inputs and hidden variables are introduced to quantize influences of excitation changes on natural frequencies, damping ratios and vibration modes; an expectation-maximization algorithm is used to iteratively identify structural dynamics parameters and Gaussian process hyperparameters. Finally, the bridge modal parameters after excitation disturbances such as wind and vehicle flow are removed and the hyperparameters representing working conditions are obtained, and long-term tracking, evaluation and prediction of the bridge structure health are realized.

The invention discloses a pressure vessel local defect detection method and system based on sound wave and micro-vibration spectrum fusion, and relates to the field of mechanical vibration or sound wave measurement. The system comprises an intelligent excitation hammer with a built-in force sensor, a composite sound and vibration acquisition unit and a data processing terminal, wherein the composite sound and vibration acquisition unit and the data processing terminal are coaxially designed. The method comprises the steps that a force sensor signal is used as a trigger source, and impact force, air sound waves and shell vibration signals are synchronously collected; calculating a sound-force transfer function to realize input energy normalization and eliminate manual knocking force difference; constructing an adaptive filter by using the sound-vibration coherence function, and performing weighting processing on the acoustic spectrum to filter environmental background noise to generate an enhanced structure sound spectrum; and finally, based on the characteristic frequency offset and the half-power bandwidth damping ratio, constructing a damage index (DI) to carry out quantitative judgment on defects. The method solves the problems that traditional acoustic detection is poor in noise immunity and cannot be quantified, and high signal-to-noise ratio detection on defects such as corrosion and delamination of the pressure vessel in a strong noise environment is achieved.

The application belongs to the technical fields of civil engineering and machinery, and discloses a self-adaptive multi-direction tuned mass damper and a working method thereof. In the horizontal direction, the self-adaptive multi-direction tuned mass damper realizes the adjustment of the horizontal frequency and the damping ratio by adjusting the effective swing length of a suspender and the length of a high-damping impact head from a U-shaped mass block; in the vertical direction, the self-adaptive multi-direction tuned mass damper realizes the adjustment of the vertical damping force and the vertical stiffness by the interaction of a roller and a trapezoidal viscoelastic material layer and the adjustment of the angle of a spring and an upper suspension steel plate. Compared with a traditional tuned mass damper, the self-adaptive multi-direction tuned mass damper has the advantages of simple structure, low energy consumption and low cost, and can realize multi-directional vibration reduction and decoupling, adjustable self-vibration frequency, self-adjusting damping ratio and other functions, and overall improves the effect of the tuned mass damper in the vibration suppression of civil engineering structure dynamic multi-disaster.

This application discloses a method and apparatus for analyzing dampers in railway track turnout beams, relating to the field of railway track accessory technology. The method includes: determining the structural vibration frequency corresponding to the lever-type tuned mass damper after adopting a lever structure; determining the adjustment amount of the lifting unit based on the structural vibration frequency; determining the structural damping ratio of the damping unit based on the damper's natural frequency; determining the electromagnetic force applied to the vibrating structure of the damping unit based on the equivalent damping corresponding to the structural damping ratio; and determining the configuration parameters of the energy harvesting unit so that the energy harvesting unit can collect the optimal vibration energy of the lever-type tuned mass damper according to the configuration parameters. This application analyzes adjustable frequency, intelligent damping, and energy harvesting, and accordingly determines the structural vibration frequency, structural damping ratio, and configuration parameters of the energy harvesting unit. It can comprehensively analyze the operating mechanism of the lever-type tuned mass damper and determine the optimal values ​​of each analysis parameter, thereby improving the accuracy of the analysis results.

The embodiment of the invention relates to the technical field of harmonic resonance suppression of an energy storage converter, and provides a harmonic resonance suppression method and system for a network construction type energy storage converter, which abandons the traditional thought of relying on fixed parameters, and perceives the stability of a grid-connected system online in real time through a non-intrusive resonance state observer. The resonance state observer can accurately identify the frequency and the damping ratio of the most unstable resonance mode in the current system to form a real-time diagnosis report, and based on the real-time diagnosis report, a virtual impedance controller with optimal parameters is further dynamically synthesized, so that the real-time diagnosis report is obtained. The center frequency of the virtual impedance can accurately lock the identified resonant frequency, and the damping strength of the virtual impedance is adaptively adjusted according to the severity of resonance (namely the deterioration degree of the damping ratio), so that the problem of invalidation or deterioration of suppression caused by the time-varying of the impedance of the power grid and the drifting of a resonance point in the traditional method is solved; and the stability of the converter in a dynamic change power grid environment is ensured.

This application provides a method for forced response analysis of an integral bladed disk (IBD), comprising: constructing a finite element model of an IBD sector; conducting disk-coupled resonance analysis of the finite element model to obtain the frequency, mode shape, and relative vibration stress of the IBD blades under one to multiple node diameters, and plotting disk-coupled resonance diagrams; determining the critical node diameter related to the number of rotor and stator blades; determining the frequency order and corresponding critical resonance speed by combining the plotted disk-coupled resonance diagrams and the critical node diameter; performing damping tests on the IBD blades to obtain the frequency order and corresponding modal damping ratios; establishing a full-ring model of the IBD rotor blades and the stator blades before and after them; conducting steady flow field analysis of the full-ring model to obtain steady results as the initial field conditions for unsteady flow field analysis; conducting unsteady flow field analysis to obtain the actual vibration stress of the IBD; and conducting dynamic strength reserve analysis to evaluate the dynamic strength reserve of the high-load IBD under the analysis conditions.