231 results about "Vibration velocity" patented technology

The invention discloses a double-row medium-length hole blasting method for a filling stope. According to the method, a theoretical value range of each blasting parameter is deduced according to field engineering practice, an ore rock blasting crushing mechanism and a blasting parameter theoretical formula. The method comprises the following steps of: constructing a stope blasting model with different hole bottom distances, explosive unit consumption and resistance line combinations by using ANSYS numerical simulation software in combination with physical and mechanical properties of ore rocks and field explosive performance parameters, and preferably selecting double-row medium-length hole blasting parameters according to a chamber effective stress distribution rule and a roof area vibration velocity peak value of the ANSYS blasting model. According to the method, by selecting the double-row optimal medium-length hole blasting parameters, it is guaranteed that ore rocks in the chamber are fully crushed, the effective stress invading the roof and the blasting vibration velocity peak value are reduced, and the roof is prevented from being damaged. And meanwhile, the explosive loading amount is reduced, the economic cost is reduced, and the production efficiency of a mine is improved.

The invention provides a wave finite element and boundary element mixed composite board structure sound insulation performance prediction method, and the method belongs to the acoustics field, and comprises the steps: carrying out the post-processing of a wave finite element model based on the wave finite element model of a composite board structure and a corresponding equivalent nodal force, and obtaining the wave finite element equation of the whole composite board structure; based on a sound-structure coupling equation, through a boundary element method, a discrete boundary element equation related to the surface vibration speed of the composite board and the radiation sound wave pressure is constructed; coupling the wave finite element equation and the discrete boundary element equation of the whole composite board structure, and determining the sound pressure of radiation sound waves of the composite board structure and the surface vibration speed of the composite board; and based on the sound pressure of the radiation sound wave of the composite board structure and the surface vibration speed of the composite board, obtaining a sound insulation performance prediction result by calculating the sound power of the incident sound wave and the radiation sound wave, and completing prediction of the sound insulation performance of the composite board structure. The problems that the sound transmission loss of large plates and medium-high frequency plates is difficult to predict and the calculation cost is high are solved.

The invention belongs to the technical field of acoustics, and particularly relates to an index type open-pore rigid plate internal vector sound field calculation method, program and equipment and a storage medium. According to a Webster equation satisfied by a simple harmonic plane sound source excitation sound pressure field, circular piston radiation acoustic impedance on an infinite baffle plate is adopted to represent radiation impedance at an opening of an exponential open pore, a sound field analytical solution of any depth in the open pore of the exponential open pore rigid plate is constructed, system calculation is carried out in combination with sound source conditions, and a sound field of any depth in the open pore of the exponential open pore rigid plate is obtained. Therefore, sound field quantities such as internal accurate sound pressure and vibration velocity of the exponential type open-pore rigid plate under the vertical incidence condition can be quickly solved, and sound field distribution conditions under different section change rules and different open-pore rigid plate sizes can be calculated. According to the method, the calculation complexity is low, the influence problem caused by sound field changes under the non-free field condition can be solved, and the calculation stability and reliability under the complex boundary condition are ensured.

The invention provides a big data-based material detection method and system, relates to the field of material quality detection, and solves the technical problems of insufficient detection precision and poor supply chain quality control linkage in an existing material detection method. The method comprises the following steps: transmitting sweep-frequency sound waves to warehouse-in materials of a peripheral warehouse by using a sound wave transmitting device; collecting vibration velocity spectrum data and sound pressure gradient data of the warehouse-in material after the warehouse-in material receives the frequency sweep sound wave; according to the vibration velocity spectrum data and the sound pressure gradient data, calculating a defect index of the warehouse-in material; and when the defect index is greater than a preset threshold value, marking the warehousing material as a defective material, sending a traceability detection instruction to a previous node warehouse, and starting a grading detection process of the previous node warehouse. The method and the device are used for warehousing detection, quality traceability and full-chain management and control processes of the materials in the supply chain.

The invention relates to the technical field of tunnel engineering, in particular to a method and a system for optimizing design parameters based on unsymmetrical pressure tunnel blasting excavation dynamic response. The method comprises the following steps of obtaining geological parameters and construction parameters of surrounding rock of the bias tunnel, constructing a discontinuous structure equivalent damage model, and obtaining initial stress field distribution of a rock mass in combination with the discontinuous structure equivalent damage model, the geological parameters and the construction parameters; analyzing the time-varying modified dynamic mechanical parameters, and calculating through a stress wave propagation path and an energy dissipation rule to obtain a time travel curve of dynamic stress and vibration speed of each point of the surrounding rock in the blasting process; correcting a dynamic response index by using a self-adaptive artificial boundary condition to obtain a dynamic response state characteristic; and on the basis of the initial stress field distribution of the rock mass, the time history curve and the dynamic response state characteristics, optimal design parameters are obtained according to optimal design indexes. According to the method, the balance between the blasting vibration strength and the construction efficiency is realized by optimizing and adjusting the design parameters.

The invention discloses a tunnel blasting vibration prediction method suitable for a sand shale interbed area, and mainly relates to the technical field of tunnel blasting. Comprising the following steps: S1, determining key factors influencing the vibration velocity; s2, building a blasting vibration prediction model in the sand shale interbed area; s3, carrying out data normalization processing; s4, introducing a BP neural network to train the prediction model; s5, introducing a particle swarm optimization algorithm and initializing related parameters of a particle swarm; s6, improving a particle swarm optimization algorithm; s7, a sand shale interbed tunnel blasting vibration prediction model of the improved particle swarm optimization BP neural network is obtained, the model is combined with blasting characteristic parameters of specific sand shale interbed area tunnel engineering for prediction, and a blasting effect prediction result is obtained; according to the method, important theoretical guidance can be provided for blasting vibration prediction of the stratified structure with changeable rock strata, and a practical safety evaluation tool is provided for ground surface vibration velocity control of similar projects.

The invention discloses a laser piston sounder normal vector microphone low-frequency calibration device and method, and solves the technical problems that the calibration frequency range is limited, the model dependence is strong and the environmental noise interference is obvious in a low-frequency band in the existing vector microphone calibration method. The device comprises a piston sounder, a laser interferometer, a vector microphone and a data acquisition system, the piston sounder comprises a piston, an excitation source and a piston cavity, an end cover of the piston cavity is provided with an optical window, and the laser interferometer measures the movement speed and displacement of the piston through the optical window; the vector microphone is hermetically coupled to the piston sounder from the side wall of the piston cavity through the adapter; and electric signal outputs of the laser interferometer and the vector microphone are connected to an input channel of the data acquisition system. The calculation model of the sound pressure and the particle vibration velocity in the piston sounder is clear, does not depend on the type of a piston excitation source, and is high in universality.

The invention discloses a flow-induced vibration velocity effect similarity method based on an equivalent mode, and belongs to the field of aircraft structure dynamic strength optimization. According to the method, the scaling model is established, the flow velocity difference caused by different sound velocities of the scaling model and the full-size model is considered at the same time, a new thickness scaling factor is established in combination with the velocity ratio on the basis of a length scaling factor, and the structural vibration parameters of the full-size model are predicted through the scaling model. The influence caused by flow velocity difference can be made up, the characteristic frequency and the structural response of the full-size model can be accurately predicted through the scaling model, and the flow-induced vibration velocity effect similarity prediction precision based on the equivalent mode is improved. According to the method, a complex structure characteristic frequency is changed into a similar form only containing the combination of a thickness scaling factor and a length scaling factor through an equivalent modal method, and a curved plate flow-induced vibration structure response similar expression is deduced, so that the defects of a current flow-induced vibration similarity theory are overcome; and the prediction reliability of the aircraft structure dynamic response similarity method is improved.

The invention discloses a woodworking machine tool noise sound power level measurement method based on a sound intensity method, and belongs to the technical field of machine tool noise measurement, and the method specifically comprises the steps: determining a housing surface covered by a tool rotation plane projection as a main sound radiation region, and determining a main bearing pedestal installation surface as an infrasound radiation region; sound pressure, vibration acceleration signals and dynamic air pressure signals of a main sound radiation area are collected; resampling a dynamic air pressure signal rotation angle domain, extracting a reference pneumatic pulsating waveform synchronous with tool tooth sweeping, and establishing an airflow induced sound pressure model according to the reference pneumatic pulsating waveform and a phase relation; calculating a surface normal vibration speed according to the vibration acceleration, and establishing a structure radiation sound pressure model in combination with a sound wave equation; decomposing the sound pressure signal to obtain two types of component estimation values, and performing parameter optimization to obtain net sound intensity of a main sound radiation area; extracting vibration frequency band energy of an infrasound radiation area, calculating equivalent sound intensity by combining a sound radiation efficiency model, and outputting a total sound power level by space integration; the invention provides an effective method for accurately measuring and controlling the noise of the woodworking machine tool.

The invention discloses a method for identifying blade surge characteristics based on blade tip vibration velocity, and relates to the technical field of non-contact measurement of rotating machinery rotor blades. According to the method, the vibration speed and the vibration displacement of the blade tip are monitored according to the two blade tip timing sensors installed in a small angle difference mode, the theoretical arrival time of the blade does not need to be considered when the vibration speed and the vibration displacement of the blade tip are calculated, and the calculation efficiency and the calculation accuracy are greatly improved; in combination with the time-frequency enhancement characteristic of a synchronous compression wavelet transform method, the dominant subsynchronous frequency of the blade is tracked and identified through the blade tip vibration speed, and meanwhile, a frequency ridge line is extracted for surge frequency identification and a surge interval is positioned; and finally, the vibration intensity during blade surge is judged according to a proposed intensity quantized value calculation method based on the blade tip vibration speed. The method for efficiently calculating the blade tip vibration parameters is provided, the surge frequency can be quickly recognized, the surge interval can be positioned, and the surge intensity can be quantitatively evaluated.

The invention discloses a high-precision identification method and system for a noise source of an asynchronous motor, and relates to the technical field of asynchronous motor detection, and the method comprises the following steps: constructing a finite element model of a to-be-analyzed asynchronous motor, dividing the surface into a plurality of detection sub-regions, and carrying out the operation simulation of the finite element motor, analyzing vibration speed and sound pressure signal data of each sub-region, synchronously acquiring actual signals, calculating relative differences with simulation data, evaluating detection priorities by combining historical fault times, forming a detection sequence according to the priorities, and sequentially performing sound-vibration coherence analysis and coherence function calculation to obtain a sound-vibration coherence detection result; according to the method, noise frequency bands are classified into structural noise and air noise, order tracking analysis is performed on the structural noise obtained through classification, an amplitude stability index and an amplitude change gradient are calculated, automatic classification and identification of electromagnetic noise and mechanical noise are realized based on a preset threshold value, and the efficiency and accuracy of fault processing are remarkably improved.

The invention discloses an airspace guiding covariance matrix self-adaptive beam forming method based on sound pressure and vibration velocity combined processing, belongs to the field of underwater acoustic detection, and particularly relates to the airspace guiding covariance matrix self-adaptive beam forming method. The objective of the invention is to solve the problem that when sound pressure and vibration velocity three-channel data are used, the SSTCM algorithm cannot carry out azimuth estimation in a specific angle range. The method comprises the following steps: 1, constructing a vector double-row array receiving data model; 2, obtaining a combined vibration velocity Vc (t); 3, based on the combined vibration velocity Vc (t) and the sound pressure channel data P (t), constructing a sound pressure and vibration velocity covariance matrix in a (P + Vc) (P + Vc) combined form; 4, calculating an airspace guiding covariance matrix based on the sound pressure vibration velocity covariance matrix and the observation orientation; and 5, estimating a direct current component in the airspace guiding covariance matrix as an orientation estimation result.

The invention discloses an underwater sound absorber with low-frequency broadband sound absorption and high pressure bearing performance and a design method of the underwater sound absorber. The sound absorber comprises a plurality of hexagonal honeycomb units which are spliced in sequence. Each honeycomb unit is composed of a hexagonal metal honeycomb framework, a rubber coating, a special-shaped embedded neck part and a cavity. The hexagonal honeycomb framework forms a hexagonal cylindrical cavity, the side wall and the bottom plate of the honeycomb framework are coated with the rubber coating, the acoustic impedance of the rubber coating is matched with the underwater acoustic impedance, and sound wave energy can be effectively absorbed. The special-shaped embedded neck part is embedded into the cavity of the honeycomb framework, and the neck part structure protrudes inwards, so that the vibration velocity and the hot sticking loss of sound waves are remarkably improved. The cavity is formed by a honeycomb framework and a rubber coating and used for storing sound energy and providing a resonance space. Multi-path dissipation and broadband sound absorption of sound energy are achieved through viscoelastic dissipation of the rubber coating and hot viscous loss of the special-shaped embedded neck part, and the composite material has remarkable potential application value in the field of underwater low-frequency noise control.

The invention provides a method and system for determining time delay between auxiliary hole subsection detonating network sections, and belongs to the technical field of tunnel blasting design. A single-hole blasting experiment and blasting experiments with different explosive loads are carried out to obtain the change relation of the single-hole vibration speed along with time and the relation between the explosive loads and the waveform vibration speed peak value, and the time delay of the auxiliary hole subsection detonating network sections is determined according to the change relation of the single-hole vibration speed along with the time. And determining a peak value of the explosive load based on a safe vibration velocity threshold value, meanwhile, setting inter-section delay and inter-row delay of the same row based on an auxiliary hole same-row segmentation mode, an inter-row segmentation mode of auxiliary holes and a blasting sequence, constructing a single-section blasting vibration waveform function, and carrying out superposition and calculation on multi-section vibration waveforms of the same row, so as to obtain a multi-section blasting vibration waveform. According to the method, the optimal delay time between the same-row segmental blasting segments is determined, then the optimal delay time between the rows is determined by constructing a single-row blasting vibration waveform function and carrying out multi-row vibration waveform superposition and calculation, finally, a blasting delay scheme is generated, and accurate control over blasting vibration is achieved.

The invention discloses a graded blasting construction method for a shallow-buried soft rock tunnel sensitive section. The method comprises the steps that measuring points are arranged in a tunnel chamber, a ground surface non-cavity section and a cavity section, and blasting vibration data are obtained; peak vibration velocity prediction models are established in a partitioned mode, an attenuation model is adopted in a chamber, a correction term is introduced into a non-cavity section of the earth surface to correct the attenuation model, and a multivariable model is established for the cavity section through dimensional analysis by integrating the horizontal distance, the elevation difference, the explosive quantity, the rock mass density and the tensile strength; determining a ground surface vibration velocity safety threshold, and quantifying a cavity vibration velocity amplification coefficient and an influence range thereof; based on the peak vibration velocity probability distribution and a preset safety level, establishing a safe dose prediction model and a safe range model; and dividing control areas according to the model, and implementing graded construction. According to the method, the vibration propagation law can be accurately described, the cavity amplification effect can be quantified, dynamic prediction of the blasting safety explosive quantity and range is achieved, and disturbance of blasting vibration to surrounding rock is effectively controlled through hierarchical management and control.

The invention belongs to the technical field of underwater acoustic array signal processing, and particularly relates to an acoustic vector circular array orientation estimation method based on cross covariance matrix construction, a program, equipment and a storage medium. The method comprises the following steps: introducing a preprocessing matrix to transform the output of an acoustic vector circular array, and constructing a cross covariance matrix of sound pressure and different vibration velocity components according to the transformed vector; combining and arranging the cross covariance matrixes of the sound pressure and the different vibration velocity components to obtain a combined arrangement matrix; performing singular value decomposition on the combined permutation matrix, and reconstructing a cross covariance matrix by using a unitary matrix formed by left singular vectors of the combined permutation matrix and a diagonal matrix formed by singular values; and implementing a spatial spectrum estimation method by using the cross covariance matrix, and taking the scanning angle corresponding to the maximum value in the spatial spectrum as an orientation estimation result of the detection target. The method is suitable for a column barrier condition, and can effectively improve the dual-target resolution and orientation estimation performance of the acoustic vector circular array under a low signal-to-noise ratio condition.

The invention relates to a mobile dipole sound source positioning device and method of a minimum aperture array, the device comprises a vector sound transmission array and a processor, the vector sound transmission array comprises at least three array elements, the distance between the array elements is 1 / 6 lambda, lambda is the wavelength, the vector sound transmission array is used for measuring sound pressure signals, the processor is used for processing the sound pressure signals, and the processor is used for processing the sound pressure signals. And a positioning result of the dipole source is solved through a nonlinear optimization algorithm. The method comprises the following steps: measuring a sound pressure signal within a preset time by using a vector sound transmission array, and converting a measured time domain sound pressure signal into a frequency domain sound pressure signal; calculating a vibration velocity signal according to the frequency domain sound pressure signal, and establishing a dipole sound source propagation model; and performing nonlinear optimization solution on the dipole sound source propagation model to obtain a positioning result of the dipole source. Compared with the prior art, high-precision and real-time positioning of the moving dipole source can be realized.

The application discloses a kind of millisecond blasting initiation interval determination method, device and system.Compared with prior art, according to actual working condition, single-hole blasting test is carried out, and the measured vibration data of multiple monitoring points are obtained, then the frequency domain distribution is obtained by Fourier transform, the most dangerous monitoring point is determined according to the frequency domain distribution of each monitoring point and its measured vibration velocity and control vibration velocity, and the initiation interval is determined according to the measured vibration data of the most dangerous monitoring point, so that the vibration velocity is effectively controlled, and the construction is safer.Secondly, by adjusting the initiation interval in real time, the vibration velocity is less than the control vibration velocity, which further ensures the safety of blasting construction.

This invention provides a caster quality detection device and its operating method. The caster quality detection device includes a support base, a caster fixing assembly, a pressure mechanism, a rotating mechanism, a vibration velocity sensor, and a controller. The support base is provided with a guide post extending in the vertical direction. The pressure mechanism is mounted on the support base, and the caster fixing assembly is mounted on the drive shaft of the pressure mechanism. The pressure mechanism drives the caster fixing assembly to move vertically along the guide post. The rotating mechanism includes a drive component and a turntable. The drive component drives the turntable to rotate. The turntable is located below the caster fixing assembly. The pressure mechanism can apply a force toward the turntable to the caster fixing assembly. The vibration velocity sensor is disposed close to the caster fixing assembly. The vibration velocity sensor, the pressure mechanism, and the rotating mechanism are all electrically connected to the controller. The caster quality detection device can detect the caster quality in real time.

The invention relates to a wave node tube and method for measuring a vibration velocity vector sensor, the wave node tube is composed of a cylindrical tube body, four standard pressure-resistant hydrophones and four high-pressure-resistant transmitting transducers, the four high-pressure-resistant transmitting transducers are of the same batch and the same model and are arranged oppositely in pairs, and the sound axes are perpendicular to each other; the standard pressure-resistant hydrophones are positioned on a sound axis and are arranged in a central symmetry manner; when in use, a measured sensor is in the center of the corrugated tube. The node tube can be used for measuring a vibration velocity vector sensor, and during measurement, the push-pull effect is generated by controlling the vibration phase of the transducer, so that the radiation impedance during vibration of the transducer is greatly reduced; and finally, by controlling the vibration amplitude of the transducer, the direction of a vibration velocity field in the tube can be controlled, and a pressure-resistant rotating device does not need to be developed.

The application provides a fatigue test method and device for a target test piece and a train, and can be applied to the technical field of vehicle structure component testing. The method comprises the following steps: determining a target vibration speed amplitude according to an initial displacement amplitude corresponding to a test stress parameter and an initial vibration frequency corresponding to the target test piece; obtaining a test operation frequency corresponding to the test stress parameter determined by controlling the test device to perform fatigue test on the target test piece according to the target vibration speed amplitude, wherein the test operation frequency represents the number of stress application operations performed by the test device on the target test piece under the condition that the target test piece reaches a preset fatigue damage judgment condition; performing curve fitting on a plurality of test stress parameters and a plurality of test operation times corresponding to the plurality of test stress parameters to determine a target fatigue curve; and determining a fatigue state test result for the target test piece according to the target fatigue curve.

The present invention discloses a method for protecting underground engineering from intrusion and explosion by strengthening self-fragmentation of rock mass, which belongs to the technical field of protection against intrusion and explosion of underground engineering. The method comprises a number of fracturers evenly arranged in the protection area, a number of fracture disks also being arranged on the fracturers, and the number of fracture disks being divided into multiple sections. The fracturers are then arranged after the positions of the fracturers are determined by calculation and experiment, and a vibration velocity sensor is arranged. Multiple groups of explosive fractures are carried out in sequence according to the explosion impact intensity sensed by the vibration velocity sensor until the explosion impact does not cause damage to the underground engineering. This method of carrying out batch explosive fractures after monitoring in sequence can form multiple layers of fracture surfaces, better hinder the propagation of the explosion stress wave, and the rock mass crushing between the fracture surfaces formed by the blasting of small-amount interval charge can further enhance the attenuation effect of the explosion impact vibration. At the same time, the fracture surfaces and the crushed rock mass can also suppress the penetration of the projectile, effectively protecting the underground engineering.

The application provides an alarm method and an alarm device, and relates to the technical field of automatic alarm. The alarm method is applied to an alarm device, and the alarm device is buried in a preset range of a target facility. The alarm device comprises a shell, a sound pressure sensor array rigidly connected with the shell, and a vibration velocity sensor array rigidly connected with the shell. The method comprises the following steps: acquiring a sound pressure signal collected by the sound pressure sensor array and a vibration velocity signal collected by the vibration velocity sensor array; detecting a sound-emitting target according to the sound pressure signal; detecting the direction of the sound-emitting target according to the vibration velocity signal; and sending an alarm information when the sound-emitting target is in a preset angle interval. The preset angle interval is used for indicating the direction of the target facility. The method is suitable for the process of risk alarm of the target facility, and is used for solving the problem of low alarm accuracy of current alarm products.

The invention discloses a high-gain spatial directivity construction method of a single-vector hydrophone, and relates to the technical field of underwater acoustic signal processing. Acquiring a sound pressure signal and a three-dimensional vibration velocity signal of the target area by using a three-dimensional vector hydrophone; equally dividing the orientation guide angle of the three-dimensional vector hydrophone to obtain a plurality of guide directions; for each guide direction, extracting a horizontal vibration velocity component in the three-dimensional vibration velocity signal, and obtaining two paths of dipole combined vibration velocity signals in each guide direction according to the horizontal vibration velocity component; performing synthetic convolution operation according to the sound pressure signal and the two paths of dipole combined vibration velocity signals in each guide direction to obtain a plurality of synthetic convolution combined signals in each guide direction; and according to the response of all the synthetic convolution combination signals in each guiding direction, obtaining the corresponding synthetic convolution combination directivity. According to the invention, high-gain high-order combination directivity is constructed, and the stability of the detection precision of an underwater weak target is improved.

The invention discloses an absolute method broadband microphone calibration device, which comprises a broadband sound source, a translation rotating table, a laser vibration measurement system and a measurement and control system, and is characterized in that the broadband sound source generates a broadband pulse sound signal to form a broadband pulse sound field, and the translation rotating table drives the broadband sound source to perform translation and rotation motion to form a broadband pulse sound field; the laser vibration measurement system measures the vibration velocity of an air mass point in the pulse sound field, scanning of the pulse sound field is achieved through translation and rotation of the broadband sound source, the calibrated broadband microphone is installed in the pulse sound field, and the sound center position of the calibrated broadband microphone coincides with the center point position of a scanning plane; and the measurement and control system controls the laser vibration measurement system to scan the broadband pulse sound field, collects the output of the laser vibration measurement system, reconstructs the pulse sound field, and realizes absolute method calibration of the calibrated broadband microphone. According to the method, the boundary dimension, the number and the reciprocity of the microphone to be calibrated are not required, segmented calibration is not required, and absolute method calibration of the broadband microphone at 20-100 kHz can be realized.

The invention belongs to the technical field of transformer iron core vibration noise modeling calculation, and discloses a dry-type transformer vibration noise calculation method, system and device and a medium, and the method comprises the steps: obtaining the normal vibration speed time domain signals of a winding, a clamp and an iron core, and correcting the phase; determining a radiation sound pressure superposition formula taking conformal unit vibration as a model; a vibration-sound coupling frequency domain calculation model based on frequency decomposition is constructed by considering the difference of mechanical wave propagation characteristics under different frequencies; and establishing a mirror image source model considering the sound wave refraction and reflection effect, and superposing the indirect radiation sound pressure and the direct radiation sound pressure to obtain a total sound pressure value. According to the method, the difference of mechanical vibration propagation characteristics under different frequencies and the refraction and reflection effect of sound waves in the environment are introduced, the sound propagation process of the dry-type transformer is modeled, and the improved unit radiation superposition method is applied to vibration-sound coupling frequency domain modeling of the dry-type power transformer. And efficient and accurate calculation of the sound propagation process of the dry-type power transformer is realized.

This invention discloses a method for measuring the sound power level of woodworking machine tool noise based on the sound intensity method, belonging to the field of machine tool noise measurement technology. Specifically, it includes: determining the housing surface covered by the projection of the tool's rotation plane as the main sound radiation area, and the main bearing seat mounting surface as the secondary sound radiation area; acquiring sound pressure, vibration acceleration signals, and dynamic air pressure signals in the main sound radiation area; resampling the dynamic air pressure signal in the rotational angular domain, extracting the reference air pulse waveform synchronized with the tool tooth sweep, and establishing an airflow-induced sound pressure model based on this and the phase relationship; calculating the surface normal vibration velocity based on the vibration acceleration, and establishing a structural radiation sound pressure model based on the sound wave equation; decomposing the sound pressure signal to obtain estimates of two types of components, and obtaining the net sound intensity of the main sound radiation area after parameter optimization; extracting the vibration frequency band energy of the secondary sound radiation area, calculating the equivalent sound intensity based on the sound radiation efficiency model, and spatially integrating to output the total sound power level. This invention provides an effective method for the accurate measurement and control of woodworking machine tool noise.

The invention discloses a blasting parameter dynamic adjustment method based on vibration signal analysis in strip mine blasting, which comprises the following steps of: S1, arranging a plurality of vibration monitoring instruments on a strip mine blasting site, and acquiring vibration velocity, frequency, vibration duration and monitoring point position information of a blasting vibration signal; s2, calculating characteristic parameters such as instantaneous frequency, amplitude and phase of the signal in combination with Hilbert conversion, and decomposing the collected original vibration signal by using a signal processing algorithm; s3, constructing a blasting effect evaluation model by integrating factors such as muck pile lumpiness distribution, root conditions, dust concentration and the like; and S4, a blasting parameter dynamic adjustment strategy is formulated according to the incidence relation between the vibration signal characteristic parameters and the blasting effect. According to the method, the actual information in the blasting process can be timely and accurately obtained, a reliable basis is provided for dynamic adjustment of blasting parameters, the blasting effect is remarkably improved, the lumpiness of a muck pile is more uniform, the generation of roots is reduced, and dust pollution is reduced.

The invention discloses a determination method based on water medium decoupling, and the method comprises the following steps: S1, collecting a design scheme and a design drawing of a tunnel structure, and obtaining related design parameters of a blast hole; s2, the theoretical explosive loading amount is calculated according to the blast hole design parameters; s3, the theoretical explosive charge and the experience explosive charge are subjected to analogy analysis, and the initial blasting explosive charge is determined; s4, the blasting vibration speed is calculated based on the initial blasting explosive load; s5, verifying the blasting vibration speed calculated in the step S4 based on a safe vibration speed control standard in the blasting safety regulation; if the blasting vibration speed does not conform to the safe vibration speed control standard, the theoretical explosive load is recalculated until the blasting vibration speed meets the safe vibration speed control standard; according to the method, the method for calculating the explosive charge when the water medium non-coupling explosive charge blasting technology is applied is improved and corrected, the error in the aspect of explosive charge calculation is reduced, and the more efficient and more economical effect is achieved when smooth blasting is achieved.