83 results about "Ambient vibration" patented technology

The invention discloses a road and bridge settlement displacement monitoring system and method based on image detection, and the method comprises the steps: selecting a plurality of static background reference points in a stable background region of a monitoring scene, so as to construct a virtual and stable image internal reference system; furthermore, by accurately tracking image coordinate changes of the background reference points in the initial reference frame and the current frame, a transformation matrix capable of accurately describing disturbance of the camera from the initial pose to the current pose is reversely calculated, and the transformation matrix is applied to observation coordinates of a monitored target point; therefore, the virtual displacement component introduced by the camera disturbance is accurately stripped from the total displacement, and finally the real image displacement generated only by the motion of the structure is obtained. By means of the mode, the system can effectively resist interference of external factors such as environment vibration and temperature change, it is ensured that the height of the finally calculated physical displacement is close to the real settlement value of the structure, and therefore the accuracy and reliability of the monitoring result are greatly improved.

The invention relates to the technical field of industrial laser precision measurement, in particular to a laser centering device for a coupler and a using method of the laser centering device for the coupler. Light spot displacement signals and environment vibration signals are synchronously collected through a laser transmitter and an optical sensor array, and a frequency domain feature decoupling module is adopted to separate a shafting displacement component and an interference component; the time domain correlation verification module is used for calculating signal time sequence correlation and generating a deviation vector, and finally the adaptive compensation decision module is used for analyzing the deviation vector and outputting an adjustment instruction. According to the invention, effective separation of real misalignment and transient noise in a dynamic environment is realized, the technical problem of measurement misalignment of an existing laser centering device in a complex industrial environment is solved, and the coupling installation precision and the equipment operation stability are improved.

The invention relates to the technical field of wind turbine generator state monitoring, in particular to a wind turbine generator state monitoring method and system based on multi-source heterogeneous data fusion, and the system comprises a data collection unit, a dynamic noise processing unit, a damage feature analysis unit and a health state output unit. A data acquisition unit synchronously obtains blade strain, unit rotating speed and environment vibration signals through hardware timestamp alignment, and a dynamic noise processing unit removes rotating speed coupling noise by using a two-parameter coupling model, a temperature-pitch angle three-dimensional correction curved surface and closed-loop feedback in combination with variable step blanking and local band elimination protection. The damage feature analysis unit extracts microcrack features by adopting multi-scale wavelet packet decomposition and kurtosis detection, and performs cross validation by fusing a vibration mode confidence factor, and the health state output unit generates a topological graph containing a crack position, an expansion trend and an alarm confidence level, so that the problems of insufficient multi-source data fusion and false and missing judgment of damage are solved, and the safety of the system is improved. And the monitoring precision is improved.

The invention relates to the technical field of environmental vibration reduction and isolation control, and discloses a vibration isolation pile, a row pile structure and a construction method of the vibration isolation pile, the vibration isolation pile comprises sleeves arranged between a subway tunnel and a basement, at least two sleeves are sequentially nested from outside to inside, and an annular filling space is formed between every two adjacent sleeves; a core filling space is formed in the inner cavity of the innermost sleeve; the annular filling space and the core filling space are divided into a plurality of vibration isolation sections in the height direction of the annular filling space and the core filling space, and each vibration isolation section corresponds to a soft soil layer or a hard soil layer on the outer side; in each vibration isolation section, the annular filling space and the core filling space are each internally provided with a rigid vibration isolation layer or a flexible vibration isolation layer, and the rigid vibration isolation layers and the flexible vibration isolation layers are alternately arranged in the radial direction of the casing pipe. The technical problems that in the prior art, the vibration isolation effect of a vibration isolation pile is the same, vibration isolation cannot be conducted according to vibration propagation characteristics and vibration isolation requirements of different soil layers, and the vibration isolation effect of the vibration isolation pile is poor are solved.

The invention discloses a double-cantilever-beam piezoelectric vibration energy collector based on an annular steady state, which comprises a piezoelectric transducer, an elastic cantilever beam, a magnet and a base, after the piezoelectric transducer is mounted on the elastic cantilever beam to form a double-layer composite cantilever beam, the magnet is mounted at the free end of the double-layer composite cantilever beam, nonlinear coupling is carried out through repulsive magnetic force, and the piezoelectric transducer is connected with the base. The two-dimensional annular potential well structure with the adjustable potential well is formed, and the energy collector can easily trigger large-amplitude inter-well movement through the potential well structure. Through the nonlinear coupling induced internal resonance effect, inter-well energy transfer and two-dimensional potential well modulation are realized, and vibration energy can be efficiently captured in a broadband without a large amount of energy input or a complex structure. According to the design, the collection efficiency of low-frequency, low-intensity and multi-direction environment vibration energy in a wide working bandwidth is good.

The invention relates to a dielectric elastomer-piezoelectric composite multi-source energy collection device for a non-intrusive electric field sensor, and belongs to the technical field of power system self-powered sensors. The device comprises a base, a dielectric elastomer unit, a piezoelectric cantilever beam, a mass block and a rectification energy storage circuit. The dielectric elastomer deforms under the action of an alternating electric field, the piezoelectric cantilever beam is driven through coupling to generate mechanical vibration, and the piezoelectric layer further converts mechanical energy into electric energy to be output. The resonant frequency of the system is adjusted by setting the mass block, so that the resonant frequency is matched with the external electric field frequency or the environment vibration frequency, and the energy conversion efficiency is optimized. The device can collect external electric field energy in a non-intrusive mode and provide a stable power supply required by a low-power-consumption sensor. The device is compact in structure, high in sensitivity and suitable for electric field monitoring in scenes such as ultrahigh-voltage power transmission lines and transformer substations, and provides reliable energy support for self-powered sensors of power equipment.

The invention discloses a holosymmetric four-mass MEMS gyroscope which comprises four sensitive mass block coupling structures which are arranged in a central symmetry manner, and four first U-shaped beams, four n-shaped beams and a cross-shaped coupling structure which are arranged in a central symmetry manner and are connected with the four sensitive mass block coupling structures, compared with the prior art, the four sensitive mass block coupling structures are designed compactly and symmetrically, so that the sensitivity can be effectively improved, and thermally induced drift can be effectively reduced. The driving mode and the working mode are separated through the specific coupling mechanism, so that frequency coupling is avoided, and environmental vibration interference is reduced. And meanwhile, the symmetry of the structure is beneficial to uniform distribution of thermal stress or mechanical stress, so that zero drift caused by temperature change is inhibited.

The invention relates to the field of intelligent sensing systems, in particular to a power transmission line tower inclination monitoring method, device and system, and the method comprises the steps: collecting a time domain FBG electric signal and a reflection spectrum of a power transmission line tower state through a fiber grating sensor; calculating a first vibration characteristic and a second vibration characteristic of the FBG electric signal, wherein the first vibration characteristic and the second vibration characteristic are used for representing significance of interference of environment time domain vibration and high-frequency vibration on the FBG electric signal; adaptively adjusting the number of decomposition layers according to the vibration characteristics; decomposing the reflectance spectrum through a variational mode decomposition algorithm, and screening IMF components related to the original signal for reconstruction to obtain a denoised reflectance spectrum; and calculating the inclination angle of the tower according to the central wavelength of the denoised reflection spectrum and the measurement data of the fiber grating sensor. According to the invention, the number of decomposition layers is adaptively adjusted according to the interference degree of environment vibration on the current measurement signal, the fiber grating sensor is ensured to obtain the accurate measurement signal, and the accuracy of power transmission line tower inclination monitoring is improved.

The invention provides a photoacoustic gas measurement method and a photoacoustic gas measurement system based on a series sensibilization technology, and relates to the technical field of optical gas sensing. The first-stage light absorption enhancement structure is used for carrying out maximum photoacoustic conversion on target gas to generate an initial photoacoustic pressure signal, the second-stage acoustic resonance structure is introduced to carry out resonance amplification on sound waves with specific frequency, a tandem cascade sensibilization framework of light absorption enhancement and acoustic resonance amplification is constructed, and through mutual verification analysis, the sensitivity of the target gas is improved. Calculating coherence outside preset noise analysis frequency band data, identifying and inhibiting common-mode noise interference caused by environment vibration and the like, generating feedback control parameters while calculating final gas concentration, adaptively adjusting intensity modulation frequency and wavelength modulation depth, and realizing high-precision and high-precision measurement. The measurement reliability, the dynamic range and the adaptive capacity of the system under complex working conditions are improved, and multiplier-level breakthrough of the sensitivity of the system and collaborative optimization of the performance are achieved.

The application provides a filtering optimization method and system for an inertial measurement unit fiber-optic gyroscope. The three-dimensional vibration signal of the inertial measurement unit fiber-optic gyroscope is collected, and the vibration modal characteristic data is generated through short-time Fourier transform. The magnetic field strength of the gyroscope is dynamically adjusted according to the data, and the environmental vibration energy is converted into current data based on the adjusted magnetic field strength. The original angular velocity data output by the gyroscope is combined, a double-channel convolutional neural network is used to extract first and second noise features from the current data and the original angular velocity data respectively, and preliminary denoising data is output after fusion. The preliminary denoising data is subjected to variational modal decomposition, and the effective modal components are selected according to a preset kurtosis rule to obtain target angular velocity data, which is used to realize filtering optimization of the gyroscope. The technical scheme provided by the application improves the measurement accuracy and filtering optimization effect of the inertial measurement unit fiber-optic gyroscope.

The invention belongs to the technical field of survey and measurement, and particularly relates to a total station for diversion engineering tunnel construction, the total station comprises a total station body, the lower end of the total station body is symmetrically and fixedly connected with two supporting plates, the lower ends of the two supporting plates are fixedly connected with the same annular bearing plate, and the annular bearing plate is fixedly connected with the lower end of the total station body. The device further comprises a multi-stage anti-shake mechanism, a machine body posture locking mechanism, an air curtain forming protection mechanism, an anti-vibration sealing enhancement mechanism, a three-axis acceleration sensor and an environment vibration standard indicating lamp. Direct transmission of construction environment vibration to the total station can be effectively blocked, the damping strength of the multi-stage anti-shake mechanism and the sealing strength of the lens are adaptively regulated and controlled according to the real-time vibration strength, the proper measurement time period is visually prompted through the indicator lamp, the total station can be limited and fixed during measurement, a conical air curtain protection layer can be automatically formed, and the measurement efficiency is improved. The adverse effects caused by vibration damage and dust attachment are avoided, and the measurement precision and the equipment operation stability are comprehensively guaranteed.

Method for determining a static bending stiffness (C B,stat ) of an object (1) which is vibrationally decoupled from an environment and arranged on at least two support means (2, 3), from dynamic acceleration measurements after vibration excitation of the object (1), comprising the steps a) Establishing a plurality of force application points (4) on the object (1), b) Arranging a number of accelerometer means (5) on the object (1), c) Exciting the object (1) at the force application points (4) determined in step a) using vibration generating means and determining a number of frequency response functions from the accelerations measured using the acceleration sensor means (5), d) Calculating an acceleration vector of the object (1) from the frequency response functions obtained in step c), e) Calculating a displacement vector from the acceleration vector determined in step d), f) Calculating a number of dynamic bending stiffness curves from the forces acting at the force application points (4) and the deflections of the object (1) induced by the displacements with the displacement vector, g) Extrapolating at least one of the dynamic bending stiffness curves obtained in step f) to a frequency f=0 Hz to obtain the static bending stiffness (C B,stat ) of the object (1).

The invention relates to the technical field of intelligent lighting, and discloses a mirror surface lamp control system and control method based on knock recognition, and the method comprises the steps: obtaining a knock signal of a sensor assembly, and carrying out the preprocessing of the knock signal, and determining a target knock signal, based on rationality of environment vibration and signal feedback of a sensor assembly, knocking characteristics of a target knocking signal are extracted, use data of the mirror surface lamp are acquired, a light multiplexing strategy or a light knocking strategy is judged and executed based on the knocking characteristics, and a working mode of the mirror surface lamp is determined based on knocking time and knocking times. And mirror surface index data of each mirror surface detection area is obtained based on the sensor assembly, mirror surface light symbols are generated for each mirror surface detection area based on all the mirror surface index data, the symbol number of the mirror surface light symbols is counted, and the brightness of the mirror surface lamp is determined based on the symbol number and the light mapping model. According to the invention, the stability and reliability of mirror surface lamp control are ensured.

The embodiment of the application discloses a cube satellite turnover device, and relates to the technical field of satellite posture adjustment, which comprises a turnover frame, a turnover driving mechanism, a vibration sensor and a control assembly. The vibration sensor is used for collecting vibration information of an external environment and sending the vibration information to the control assembly. The control assembly is used for controlling the turnover driving mechanism to be locked according to the received vibration information. The cube satellite is carried by the turnover frame, and the vibration sensor is further arranged on the turnover frame to monitor the vibration of the external environment. Since the vibration sensor and the turnover driving mechanism are respectively connected with the control assembly in signal, the control assembly can control the turnover driving mechanism to be locked according to the collected vibration information, and then the turnover frame connected with the turnover driving mechanism in transmission is also locked, the working of the turnover driving mechanism is stopped, and the turnover posture adjustment of the cube satellite is prevented from continuing under the interference of external force or external environment vibration, so that the safety of the cube satellite is effectively ensured.

This invention relates to the field of optical experimental equipment technology, and particularly to an optical experimental turntable, comprising a base, a rotary worktable mounted on the base, and a drive module disposed on one side of the rotary worktable; the optical experimental turntable also includes an aperture adjustment unit, which is disposed at the upper end of the rotary worktable and used to change the aperture of the light-gathering hole on the rotary worktable. The buffer unit used in this invention can perform two-stage vibration reduction; the vibration damping medium within the buffer frame can release the vibration kinetic energy transmitted by the base through its own vibration, significantly reducing the vibration transmission path. Combined with the elastic buffering effect of the buffer spring, it effectively isolates the interference of external environmental vibration and the vibration of the equipment itself on the optical path.

The invention discloses an anti-vibration pose compensation support and vision measurement equipment, and relates to the technical field of structure monitoring equipment, the anti-vibration pose compensation support comprises a supporting structure, a motion pose measurement mechanism and a motion compensation mechanism, the supporting structure comprises a base and an outer ring frame, an inner ring frame is arranged in the outer ring frame, and a workbench is arranged in the inner ring frame; the moving posture measuring mechanism detects the position change of the base; a first driving assembly of the motion compensation mechanism drives the outer ring frame to move, a second driving assembly drives the inner ring frame to move, and a third driving assembly drives the workbench to move. Kinematics parameters of the supporting structure are collected in real time through the motion posture measuring mechanism, six-degree-of-freedom posture adjustment is achieved through the motion compensation mechanism, posture deviation of the supporting structure is adjusted, environment disturbance is dynamically compensated, it is ensured that the posture of the vision measuring instrument is constant, disturbance influences of factors such as wind loads and environment vibration on the vision measuring instrument are avoided, and the measurement accuracy is improved. The problem that the measurement precision of the vision measurement instrument is reduced due to vibration in a complex environment is solved.

The invention relates to the technical field of artificial intelligence and signal processing, and provides a drilling and tapping machine fault recognition method and device.A first vibration sensor is arranged on a drilling and tapping machine, and a second vibration sensor is arranged at an environment vibration signal collection position. Environmental vibration noise is effectively suppressed, the signal-to-noise ratio is remarkably improved, and the fault recognition accuracy of the drilling and tapping machine is improved. The non-stationary fault impact is visualized by using continuous wavelet transform, and the local time-frequency texture of the non-stationary fault impact is automatically learned by using a two-dimensional convolutional neural network, so that a rough threshold is upgraded to fine classification, and the accuracy of fault recognition is improved. According to the method, automatic fault identification of the drilling and tapping machine is realized based on the vibration signal, the fault type is identified, and the identification accuracy is improved.

The invention discloses a sensor-based plate thickness adaptive adjustment system, which comprises a multi-source sensing fusion acquisition module, a dynamic parameter adjustment calculation module and a closed-loop feedback execution module. The multi-source sensing fusion acquisition module comprises a laser displacement sensor, a vibration sensor, a temperature sensor and a tool wear sensor which are respectively used for acquiring a plate thickness original signal, a processing environment vibration signal, a processing area environment temperature signal and a tool accumulated wear loss signal; the dynamic parameter adjustment calculation module receives the signal and calculates a machining parameter adjustment instruction; the closed-loop feedback execution module comprises a servo controller and an execution mechanism, and the execution mechanism adjusts the machining action under the control of the servo controller. According to the system, the problems of inaccurate thickness measurement and parameter adjustment lag caused by multi-factor interference in the prior art are solved, and the plate processing quality and consistency are improved.

The present application belongs to the field of vibration power generation. It relates to a vibration pickup component for vibration power generator, which is composed of a square frame, a support, a vibrator swinging around a point above the center of gravity, and a anti-dropping assembly. It mainly plays the role of expanding the frequency band and picking up low vibration energy. It also relates to a vibration pickup device for electromagnetic vibration power generator and a vibration pickup device for composite vibration power generator, which are both composed of a vibration pickup component and a gimbals. Both of them can make the vibration pickup component pick up the omnidirectional external excitation. The latter also produces multiple types of feedback actions for various power generation units. It also relates to an electromagnetic vibration power generator and a composite vibration power generator. The former is composed of a vibration pickup device for electromagnetic vibration power generator, a permanent magnet, etc. The latter is composed of a vibration pickup device for composite vibration power generator, a permanent magnet, a piezoelectric and friction power generation unit, a wheel disc type friction nano power generation unit, etc. Both of them improve the power generation efficiency of picking up environmental vibration energy.

This invention relates to the field of metal material heat treatment quality inspection technology, and particularly to a method for rapid annealing effect detection of metal materials based on acoustic response, comprising: Step 1: Acoustic excitation and synchronous acquisition; Step 2: Multi-physics coupling compensation: Based on temperature distribution data and the temperature dependence of material acoustic properties, the phase compensation amount of the vibration signal is calculated; the environmental vibration spectrum is obtained through a production line mechanical vibration monitoring device, and the excitation response component is separated from the original vibration signal using adaptive filtering; Step 3: Annealing sensitive feature extraction; Step 4: Dynamic quality mapping and control: The real-time feature vector is input into a pre-trained machine learning model, and the recrystallization ratio and grain size are output; when the output parameters exceed the process threshold, the annealing furnace control parameters are adjusted. Through non-destructive and precise acoustic monitoring technology, the annealing effect of metal materials can be monitored efficiently and accurately in high-speed, high-noise, and strong-interference industrial environments.

This invention discloses a high-precision, vibration-resistant, large-aperture mechanical phase-shifting interferometry measurement method and device, belonging to the field of optical precision measurement technology. The implementation method of this invention is as follows: initial values ​​of the phase shift are obtained through principal component analysis; initial values ​​for the iterative algorithm are obtained by calculating the background light intensity and modulation parameters of the interferogram; an environmental vibration error model is established to improve the suppression capability of noise such as vibration in the measured environment; and an iterative linear regression algorithm is used in conjunction with the initial estimation of the measured surface shape, iteratively solving for spatial and temporal variables respectively to improve the system's response speed and measurement accuracy. This invention features fast convergence and strong robustness. By obtaining the initial values ​​of the measured surface shape, as well as the modulation and background noise, and constructing a noise model that varies with time, environmental noise is suppressed, achieving high-precision measurement of the surface shape parameters of large-aperture optical elements.

The invention provides a DAS external damage prevention method and system based on deep learning, and the method comprises the steps: collecting an environment vibration signal through a DAS, carrying out the preprocessing of the environment vibration signal, and building a time period feature database; based on the time period feature database, training a special identification model of each monitoring time period by adopting a CNN-LSTM hybrid network to obtain a multi-time period initial sub-model; arranging the multi-period initial sub-models into a preset scene model through model similarity analysis, establishing a dynamic updating mechanism, and optimizing model parameters by adopting updated data to obtain an optimized multi-period model; and a current time period model in the optimized multi-time period model is monitored and matched in real time, a monitoring alarm result is output by utilizing multi-dimensional judgment, and a model library is continuously updated based on the monitoring alarm result.

The utility model relates to the technical field of radon gas detection, in particular to an intelligent sensor which is used for detecting radon gas and has an anti-vibration function. Comprising an ion pulse ionization chamber and a detection assembly in the ion pulse ionization chamber, a main control circuit board is arranged at the upper end of the ion pulse ionization chamber, the detection assembly is connected to the main control circuit board, a vibration sensor is fixedly arranged on the main control circuit board, the vibration sensor is arranged on the main control circuit board, the model of the vibration sensor is SW-18015PZR-10G12B3, and the detection assembly is connected to the detection assembly. When environment vibration or real object vibration occurs, the vibration sensor transmits a switching value signal to the main control circuit board, the main control circuit board receives the switching value signal of the vibration sensor, and at the moment, the main control circuit board controls other units to stop working. And the service life and the stability of the radon gas sensor are well protected.

The invention belongs to the technical field of water conservancy project infrastructure and environment vibration control, and discloses a vibration isolation structure system for the surrounding area environment of a pumped storage power station. The vibration isolation structure system comprises a vibration isolation barrier arranged on the periphery of a target protection building; the vibration isolation barrier comprises a plurality of local resonance units which are annularly arranged at intervals, and the local resonance units are buried underground; the vibration isolation ditch is arranged on the periphery of the target protection building; the outline of the cross section of the vibration isolation trench is narrowed in a stepped manner along with the increase of depth; and the vibration isolation foundation is arranged at the bottom of the target protection building and used for supporting the target protection building. According to the invention, by setting a multi-level cooperative control strategy of near-field isolation-basic vibration isolation-wave resistance barrier, multi-level dissipation and effective obstruction of vibration energy are realized, the vibration isolation effect is remarkably improved, and especially the isolation performance for low-frequency vibration and earth surface Rayleigh waves (R waves) is improved.

The application discloses a discrete doll-in-doll type periodic vibration reduction and isolation pile and a laying method thereof, and comprises: a plurality of discrete doll-in-doll type vibration reduction and isolation single piles arranged according to a square lattice; each single pile structure comprises a local resonance concrete layer, a rubber soft layer and a steel pipe wrapping layer which are sequentially and multi-layered nested; the single pile as a whole presents a doll-in-doll type structure, and the cross section of each single pile is circular, and the rubber soft layer is arranged in a discrete type along the ring direction. The pile utilizes the band gap characteristics of the periodic structure to inhibit environmental vibrations with frequencies in the attenuation domain range, so as to reduce the adverse effects of environmental vibrations such as rail transit operation and earthquakes; the pile can break the limitation that the traditional periodic vibration reduction and isolation pile is not conducive to isolating low-frequency vibration waves in a limited site; the pile can make up for the defect that the traditional periodic vibration reduction and isolation pile can only isolate vibrations in a single frequency band, and realizes multi-frequency band vibration reduction and isolation application; the pile has strong geometric variability, can be targeted to attenuate environmental vibrations in different frequency bands, and has good durability and high operability.

The invention discloses a high-precision concrete vibration reduction table and a vibration reduction table construction method.The high-precision concrete vibration reduction table is characterized in that a first vibration reduction layer is arranged on the upper side of a vibration reduction base in an embedded mode; the bearing base is anchored on the position, corresponding to the first vibration reduction layer, of the vibration reduction base, and a second vibration reduction layer is arranged on the upper side of the bearing base in an embedded mode; and the equipment base is embedded in the position, corresponding to the second vibration reduction layer, of the bearing base, and the equipment base is filled with damping anti-vibration quartz sand. By arranging the vibration reduction base, the bearing base and the equipment base which are formed by stacking the vibration reduction layers at intervals, vibration is resisted through inertia of the different bases, impact energy is absorbed through the vibration reduction layers, the different inherent frequencies of the multiple bases can avoid the frequency of equipment operation and environment vibration, the resonance condition is prevented, and the service life of the equipment is prolonged. The damping device can adapt to various high-precision production devices, does not need to be adjusted in the using process, and can resist external environment interference.

The invention discloses a magnetoelectric vibration energy harvesting system capable of power optimization, which comprises a magnetoelectric vibration energy harvester and a magnetoelectric vibration energy harvesting circuit, and is characterized in that the magnetoelectric vibration energy harvesting circuit comprises an energy harvesting module, an accelerometer and a microcontroller module, the micro-controller module is connected with the accelerometer, the micro-controller module and the accelerometer are powered by direct-current voltage, the accelerometer senses environment vibration and generates a corresponding acceleration signal, and the micro-controller module determines open-circuit voltage of the magnetoelectric vibration energy harvester according to angular frequency of the square wave signal and amplitude of the acceleration signal and outputs the open-circuit voltage of the magnetoelectric vibration energy harvester according to the amplitude of the acceleration signal. Controlling the output power of the energy capture module by adopting a fractional order open-circuit voltage method to realize maximum power transmission; the device has the advantages that maximum power transmission is realized by adopting a fractional order open-circuit voltage method, the energy transmission process does not need to be interrupted, and the device has a fast dynamic response characteristic and a high energy harvesting effect.

The invention relates to transforming microphone data into accelerometer data. In a method for transforming microphone data into accelerometer data, microphone data is received. A device-specific filter is applied to the microphone data to generate first data, the device-specific filter for transforming the microphone first data according to characteristics of the device. The first data is expanded by adding sensor noise to the first data to generate second data, the sensor noise characterizing noise inherent to the device. The second intermediate data is expanded by adding ambient vibration noise defining an environment in which use of the device is simulated to generate accelerometer data.

The invention provides a vibration source test identification method and system based on a visual system, and relates to the technical field of rail transit vibration monitoring. Screening grating deformation images which are synchronous with impact excitation and have signal-to-noise ratios reaching a preset condition from the image sequence to form an effective image subset, obtaining displacement vector data of each monitoring point on the surface of the monitored object through phase analysis and three-dimensional reconstruction, and mapping the displacement vector data into physical space displacement time history data; and processing the displacement time history data value to generate an acceleration time history and extract visual vibration characteristics, reversely solving the visual vibration characteristics in combination with a vibration wave propagation model, and determining the spatial position, the action time history and the frequency component of the vibration source, so that accurate identification and parameter determination of the rail transit environment vibration source can be realized.