1055 results about "Vibration exciter" patented technology

The invention discloses a mechanical arm welding detection intelligent diagnosis method and system based on laser ultrasonic guided waves. According to the system, a high-precision multi-degree-of-freedom steering engine, an infrared distance measurement array, a temperature sensor, a laser vibration exciter and a laser vibration meter are integrated at the tail end of a mechanical arm, synchronous operation of welding and online detection is achieved by presetting a welding track, and the system collects an excitation signal, a reflection ultrasonic signal and temperature data through a high-speed data collection card; and the signal is preprocessed through a temperature matching model, phase compensation and baseline correction. Then, wavelet decomposition is adopted to extract time-frequency features, intelligent diagnosis is achieved through a pre-trained one-dimensional convolutional neural network, a dynamic threshold value is set based on the 3 sigma criterion, and recheck feedback is automatically triggered when detection data exceed the limit, the welding detection efficiency and precision are remarkably improved through the scheme, data closed-loop management and intelligent quality tracing are achieved, and the reliability of welding detection is improved. And the automatic production requirement of modern steel structure manufacturing is met.

The invention provides an abnormal sound test bench capable of rapidly switching modes. The abnormal sound test bench comprises a base, a first test unit, a second test unit and a power device arranged between the first test unit and the second test unit. The power device comprises two vibration exciters arranged in the y direction. The first test unit can make a to-be-tested part generate single-degree-of-freedom vibration in x, y and z directions, and the second test unit can make the part generate pitching and side-tipping composite-degree-of-freedom vibration. The first test unit and the second test unit can be respectively driven by the same group of power device, only the tested part needs to be transferred in a short distance during mode conversion, the same group of power device is used in the two test modes, and the test efficiency is greatly improved during the test of the rear half part. The relevant parameters between the tested part and the power device are acquired in the first half part, so that the debugging time between the part and the power device is greatly saved, and the testing efficiency is improved.

The invention relates to an AI server cooling water pump vibration quantity self-adaptive calibration test method and system, an intelligent test platform integrates a six-dimensional force sensor and a temperature compensation vibration exciter, the platform rigidity is automatically calibrated, a water pump-pipeline system transfer function is obtained, and a rotating speed-lift-modal frequency three-dimensional mathematical model is established; a three-axis MEMS accelerometer array is arranged at sensitive parts such as a water pump bearing seat and a motor shell, and vibration, current and pressure signals are synchronously collected; carrying out time-frequency domain signal processing by adopting variational mode decomposition in combination with self-adaptive S transformation, and extracting a 128-dimensional full-frequency domain feature vector containing a modulation side frequency band; effective values of vibration acceleration, speed and displacement are calculated through a frequency domain integration algorithm, and current harmonic interference is corrected through an electromagnetic vibration compensation model; and finally, a vibration health degree evaluation model containing 18 characteristic parameters is established based on a support vector machine, the test system comprises an intelligent test platform unit, a multi-source sensing unit, an edge calculation unit and a data management unit, and microsecond-level synchronous acquisition and GB-level data throughput are realized through a time sensitive network. And online incremental learning and automatic generation of a test report are supported. The method has the effect of improving the water pump vibration quantity test precision.

The invention discloses a loss tuning method of a power transformer, which is applied to a transformer body sleeved with a winding and comprises the following steps: applying scanning current excitation containing fundamental waves and harmonic waves to the winding, synchronously acquiring a body vibration signal and converting the body vibration signal into a frequency spectrum; extracting a formant from the frequency spectrum, matching the formant with a theoretical electromagnetic force wave and a structure inherent frequency library, and identifying a coupling formant to be optimized; aiming at each formant, installing a vibration exciter in a corresponding area, sending out an anti-phase periodic pulse force, and dynamically and finely adjusting a pulse force parameter by monitoring a vibration response in real time and taking equivalent mechanical impedance minimization as a target; when the optimal damping state is achieved, the vibration exciter output rod is locked, and static pre-tightening force is formed; and after all formants are adjusted and optimized in sequence and the prestress is locked, final pressing and fixing of the transformer body are completed in the state that the pretightening force is kept. According to the invention, the dynamic loss source of the individual transformer can be actively inhibited and cured before assembly and curing, the operation loss and noise are effectively reduced, and the structural stability is improved.

The invention relates to the technical field of parameter control, and discloses a vibrating screen parameter self-adaptive control method and system based on machine learning. The method comprises the following steps: collecting coal characteristic parameters through an image device and a sensor; calculating a load coefficient and a difficulty index according to the parameters, and adjusting the parameters of the dual-motor vibration exciter to control vibration; the spring pre-tightening force and the screen surface inclination angle are adjusted according to vibration feedback, and the screening track is optimized; and the feeding speed and the baffle height are adjusted based on screening efficiency data, and self-adaptive control is achieved. The technical problems that traditional vibrating screen fixed parameter control cannot adapt to multi-coal-type changes, a vibrating screen control system lacks coal material characteristic real-time sensing and analyzing capacity, and a precise mapping and dynamic optimization mechanism is lacked between vibrating parameters and screening efficiency are solved.

The invention relates to the technical field of data processing, and discloses an environment detection analysis method and system based on a simulation micro-motion signal excitation generator. The method comprises the following steps: generating a vertical vibration signal through an integrated structure of a constant-resistance vibration exciter and a special coupling base; performing multi-band signal excitation and station arrangement according to the frequency parameter combination; filtering and normalizing the original signal, and calculating a spatial autocorrelation coefficient; a frequency dispersion curve is extracted through an SPAC method; inverting an underground S-wave velocity structure by using a divergence genetic algorithm; and analyzing the speed abnormal region by adopting an edge detection algorithm, and determining the position and state of the box culvert body. According to the invention, high-precision non-destructive detection of the buried power pipeline box culvert body is realized in an urban complex underground environment.

The invention relates to a large-scale structure dynamic response prediction method based on a hybrid deep learning model. The method comprises the following steps: establishing a finite element model of a large-scale structure; a vibration exciter is used for measuring modal parameters of the large-scale structure, and the finite element model of the large-scale structure is corrected according to the modal parameters of the large-scale structure; simulating the dynamic response of the large-scale structure under the dynamic load by using the corrected finite element model; meanwhile, a sensor is used for actually collecting the dynamic response of the large-scale structure under the dynamic load; constructing a training set through analog simulation and actually acquired dynamic response of the large-scale structure under the dynamic load; training the hybrid deep learning model according to the constructed training set; and inputting the dynamic load acting on the large-scale structure into the trained deep learning model to predict the dynamic response of the large-scale structure. According to the method, the prediction efficiency and accuracy are improved, the generalization ability of the model is enhanced, and the method can adapt to various different environments and conditions.

The high-cleanliness cleaning device comprises a cleaning basin, a plurality of ultrasonic transducers are annularly arranged on the side wall of the cleaning basin, the bottom face of the cleaning basin is connected with the bottom face of a vibration excitation plate through a spring seat, the vibration excitation plate is provided with a vibration exciter, and the center of the vibration excitation plate is rotationally connected with a leakage disc. The bottom surface of the drain plate is connected with the output end of a rotating motor through a universal joint A, the rotating motor is mounted below the cleaning basin, and a spraying mechanism is arranged above the cleaning basin; the technology comprises the five steps of pre-spraying cleaning, ultrasonic cleaning, neutral liquid cleaning, purified water cleaning and workpiece multi-stage drying. The cleaning equipment has the full-automatic rotary spraying function, ultrasonic excitation cleaning can be conducted on workpieces on the drain disc, the problems that the number of particles of the aluminum die-casting workpieces is out of tolerance, and the aluminum die-casting workpieces become yellow after being cleaned can be solved by combining two specially-made cleaning agents, the corrosion speed of elements such as silicon, copper and iron is increased while aluminum corrosion is slowed down, and the cleaning efficiency is improved.

The invention provides a weather-proof test system for an abnormal sound vibration test. The weather-proof test system comprises an environment box and abnormal sound test equipment, the environment box comprises a base table and a box body, a temperature adjusting chamber is formed in the box body, the base table is provided with a carrying base face located on the lower side of the temperature adjusting chamber, the base table is provided with a heat insulation chamber sunken relative to the carrying base face, and the heat insulation chamber is separated from the temperature adjusting chamber through a heat insulation plate; the abnormal sound testing equipment comprises a driving mechanism, a transmission mechanism and a bearing mechanism, the driving mechanism comprises a vibration exciter, the vibration exciter is arranged in the isolation chamber, and the transmission mechanism and the bearing mechanism are arranged above the carrying base plane. Different parts of the abnormal sound testing equipment are separated by arranging the temperature adjusting chamber and the heat insulation chamber, the transmission mechanism and the bearing mechanism of the mechanical part are arranged in the temperature adjusting chamber, and the driving mechanism of the electrical part is arranged in the heat insulation chamber, so that the requirement of a weather-proof test can be met, and the working stability of the vibration exciter can be ensured.

The invention discloses a vibration type battery liquid cooling device and a method thereof.The vibration type battery liquid cooling device comprises a sealing box body containing cooling liquid, a battery, a temperature adjusting assembly, a water pump, a vibration assembly and a controller, a gas cavity is formed between the upper surface of the cooling liquid and the inner top wall of the sealing box body, and the battery is detachably installed in the sealing box body and immersed in the cooling liquid; the temperature adjusting assembly is arranged on the inner wall of the sealing box body, the vibration assembly is arranged at the bottom of the outer side of the sealing box body, a water inlet and a water outlet lower than the water inlet are formed in the two sides of the sealing box body respectively, and the water inlet and the water outlet are connected with the water pump through pipelines respectively to form a circulating water path. The controller is in signal connection with the temperature adjusting assembly, the water pump and the vibration assembly. On the basis of circulating water cooling of a traditional battery, vibration generated by the vibration exciter installed below the sealed box body promotes instability of a temperature boundary layer in cooling liquid, the convection heat exchange efficiency of flowing is improved along with enhancement of vibration strength, and the cooling efficiency is improved.

The invention relates to an engine vibration boundary condition calibration test bed and a test method, and belongs to the technical field of vehicle testing. According to the technical scheme, the engine vibration boundary condition calibration test bed comprises a simulation suspension used for installing an engine to be calibrated; the vibration excitation device comprises a Z-direction vibration exciter located at the bottom of the simulation suspension, a Y-direction vibration exciter located on one side or two sides of the simulation suspension in the vehicle driving direction, and an X-direction vibration exciter located on the front side and / or the rear side of the simulation suspension in the vehicle driving direction; a plurality of acceleration sensors which are installed on the simulation suspension and are used for collecting acceleration signals of the simulation suspension; and the data processing module is used for collecting and processing acceleration signals of the plurality of acceleration sensors. The scheme has the beneficial effects that the vibration environment of the engine in actual work can be accurately simulated, a reliable basis is provided for vibration calibration, and the calibration efficiency and the data accuracy are improved at the same time.

The utility model discloses a civil air defense engineering pipeline filtering and purifying device which comprises a mounting pipe, an obliquely arranged filtering net plate is fixedly mounted in the mounting pipe, impurities in flowing gas are filtered through the filtering net plate, and an obliquely arranged vibration exciter is fixedly connected to the bottom of the right side of the filtering net plate. Through the arrangement of a series of structures, gas introduced into the civil air defense project can be filtered and purified, tiny impurities in the gas can be effectively treated in the mode that the gas is filtered and then purified, the filtering and purifying effect on the gas is improved, and the gas purification effect is improved. According to the air-raid shelters, the situation that impurities enter the air-raid shelters and hurt the bodies of people is reduced, dust attached to the filter screen plate can be effectively cleaned in the mode that excitation is matched with air back-blowing, the situation that the dust blocks meshes of the filter screen plate can be effectively reduced in the mode of back-blowing dust cleaning, and the dust cleaning effect on the filter screen plate is improved.

The permanent magnet type dual-drive electric vibration exciter comprises a magnetic circuit assembly and a moving coil assembly, the magnetic circuit assembly comprises a magnetic steel ring, an upper permanent magnet, a lower permanent magnet, a center magnetic pole and a bottom connecting plate, a first containing space and a second containing space are arranged in the magnetic steel ring, the upper permanent magnet is arranged in the first containing space, and the lower permanent magnet is arranged in the second containing space. The moving coil assembly comprises a moving coil framework, a first driving coil and a second driving coil, the first driving coil and the second driving coil are wound on the moving coil framework, the upper permanent magnet, the magnetic steel ring and the center magnetic pole form an upper magnetic field ring space, the first driving coil is located in the upper magnetic field ring space, and the second driving coil is located in the lower magnetic field ring space. The lower permanent magnet, the magnetic steel ring and the central magnetic pole form a lower magnetic field ring space, the second driving coil is located in the lower magnetic field ring space, the central magnetic pole is arranged in the magnetic steel ring, and the bottom connecting plate is arranged at the bottom of the lower magnetic steel ring; two independent magnetic field loops are established, a larger magnetic field is achieved, thrust is increased, the utilization rate of the magnetic field is improved, and higher vertical vibration precision and smaller transverse vibration are achieved.

The invention discloses an automatic sample weighing instrument. The automatic sample weighing instrument comprises a main body, a lofting module, a sampling module, a sample weighing module and a cleaning module, the lofting module and the sampling module are both movably arranged on the main body, and the sample weighing module and the cleaning module are both fixedly arranged on the main body; the lofting module is used for fixing and storing samples; the sampling module is used for extracting the sample stored in the sample placing module and transferring the sample to the sample weighing module, the sampling module comprises a vibration exciter and a sampling mechanism capable of being opened and closed, the vibration exciter is connected with the sampling mechanism, and the vibration exciter can vibrate the sample in the sampling mechanism so as to add the sample into the sample weighing module; the sample weighing module is used for weighing the weight of a sample; the cleaning module is used for cleaning the sampling module. The sampling module of the automatic sample weighing instrument is arranged, so that the sampling mechanism can be closed after a sample is taken, and flying dust pollution in the transfer process is avoided. Moreover, not only can the sample be taken, but also the sample can be transferred and added, so that the automatic sample adding process is simplified, and the sample adding efficiency is improved.

The invention relates to the technical field of shakeout machine equipment, and discloses a vibration exciter type inertial vibration shakeout machine which comprises a base, a vibration structure and a screening structure. The base is rectangular, the vibration structure is fixedly arranged on the upper wall of the base, and the screening structure is fixedly arranged on the vibration structure; the device has an efficient screening effect; through the synergistic effect of the first vibration assembly and the second vibration assembly, the vibration effect of the first sieve plate can be improved, according to the whole scheme, assembly structures can be selected according to different requirements, the possibility of flexibility and customization is provided, and the requirements of different users and different application scenes are met; through the arrangement of the stirring structure, especially the design of the stirring rod, the stirring rod can reciprocate below the sieve plate and is obliquely attached to the sieve plate, so that the stirring rod can be inserted into the sieve holes under the action of elastic force, the blockage of the sieve holes is effectively prevented, and the continuity and the stability of the sieving process are ensured.

The embodiment of the invention provides an engine suspension test bench, method and equipment and a storage medium, and the test bench comprises a vibration table which is used for constraining and installing a to-be-tested engine and a suspension; the support buffer piece is arranged below the vibration table and is used for supporting the vibration table, the engine to be tested and the suspension so as to enable the vibration table, the engine to be tested and the suspension to be in a suspension state; the vibration exciters are arranged on the two opposite sides of the vibration table, and the vibration exciters are used for driving the vibration table to vibrate during in-phase excitation or anti-phase excitation so as to simulate road vibration; and the controller is connected with the vibration exciter and is used for exciting the vibration exciter in the same phase or in the opposite phase. When the rack is used for testing, the vibration condition performance similar to the pavement can be simulated, and the functions of risk assessment and abnormal sound problem reproduction of the suspension abnormal sound are realized, so that the verification period is shortened, and the test comprehensiveness is ensured.

The utility model provides a self-balancing sealing switching assembly and a comprehensive test device, the self-balancing sealing switching assembly is arranged between a test box and a vibration exciter, is used for transmitting vibration force of the vibration exciter into the test box, and comprises an outer support, an inner support and a switching plate, the outer support is arranged on a shell of the vibration exciter, and the inner support is arranged on the shell of the vibration exciter. The inner support is connected with the output end of the vibration exciter, the inner support is arranged in the outer support, the outer support is provided with a hole through which the inner support can penetrate to do reciprocating motion, the adapter plate is arranged at the top of the inner support, and a balance supporting piece is arranged between the outer support and the inner support and used for balancing pressure inside and outside the test box; a flexible sealing structure for sealing is arranged between the outer bracket and the test box; a rolling sealing piece used for sealing is arranged between the outer support and the adapter plate. By means of the structure, air pressure in the test box is balanced, sealing between the test box and the outer support and sealing between the adapter plate and the outer support are achieved, the sealing device is matched with a conventional vibration table, and the specification requirements for the test box and the vibration table are lowered.

The invention relates to the technical field of vibration control, in particular to a truss vibration control method fusing a virtual vibration absorber and a notch filter, and the method comprises the steps: building a dynamic model of a truss, carrying out the modal identification of the dynamic model, obtaining the modal parameters of the truss, determining the positions of the truss where vibration exciters are installed according to the modal parameters, and carrying out the vibration control of the truss. And after the position of the vibration exciter is confirmed, a controller is established in combination with the virtual vibration absorber and the notch filter, an output value of the controller serves as a control value of the vibration exciter and is input into the vibration exciter, and the vibration exciter is controlled to suppress truss vibration at the position of the vibration exciter. According to the method disclosed by the embodiment of the invention, the fixed-frequency disturbance is provided by using the inertial exciter, the active cancellation of the fixed-frequency disturbance on the truss is realized, and the harmonic vibration of the truss can be efficiently, accurately and stably inhibited in a complex space environment.

The invention relates to the technical field of simulation control, and discloses a machine tool environment vibration simulation device and control system based on an electric vibration exciter, and a signal generation module generates a control signal according to a control instruction through a signal generation strategy; the excitation driving module amplifies the control signal and drives the excitation module; the feedback monitoring module monitors the working state data of the machine tool to be tested, generates feedback information, and performs adjustment according to needs, so that the accuracy and efficiency of testing are improved; the safety protection module recognizes the abnormal state adjusted according to the feedback information, executes safety protection according to the abnormal state, and immediately executes safety protection measures once abnormity is monitored so as to prevent equipment damage or personnel injury; the reliability and the stability of environment vibration simulation of the tested machine tool are improved, through accurate control, real-time monitoring and self-adaptive adjustment, the simulation control system can keep consistent performance in long-time operation, and accidental shutdown and maintenance cost are reduced.

The invention discloses high-voltage wiring harness connector terminal fretting wear test equipment which comprises an equipment base, a high-frequency vibration exciter and a lifting platform are mounted on the equipment base, and a mounting platform is arranged at the top of the lifting platform; a left test piece mounting loading mechanism and a right test piece mounting force measuring device are arranged on the mounting platform. The device can realize a multi-physics field coupling test, current-carrying friction and arc erosion of an electric contact surface in a real working condition are simulated by combining a current load with high-frequency mechanical wear, and the electric-mechanical coupling wear characteristic of a new energy automobile charging terminal is accurately reproduced. The device supports the dynamic adjustment of normal load, simulates the contact pressure change of the left and right test samples of the test terminal in the plugging process through the test sample pin and the test sample jack, can be used for researching the relevance between the fretting wear and the contact resistance of the test terminal under different loads, and realizes the test of the terminal under complex working conditions in a laboratory environment. The test process is convenient, efficient and accurate, and the test cost and the test period are greatly reduced.

The invention provides a rock testing device and method based on laser calibration excitation compensation, and relates to the technical field of rock physical testing, and the rock testing device comprises a rock sample clamping part which is used for clamping a rock sample; the strain testing part is used for being arranged on the surface of the rock sample; the output end of the vibration exciter is in contact with the rock sample clamping component; the driving module is connected with the vibration exciter and is used for inputting an electric signal to the vibration exciter so as to drive the vibration exciter to operate; the laser vibration meter is used for testing the acceleration of the output end of the vibration exciter during no-load operation under different operation frequencies; the problem that in the prior art, in a large frequency range, the testing precision of rock physical testing under different frequencies is poor is solved.

The invention discloses a large-stroke hydraulic vibration horizontal test bed, which is used for solving the problems of interference, abrasion and easy fatigue fracture of a force transmission component caused by a centering error between a large-stroke hydraulic vibration exciter and a horizontal table board. The test bed comprises a base, a hydraulic vibration exciter, a horizontal table top and a spring plate assembly connecting the base and the hydraulic vibration exciter. A function decoupling design is adopted, wherein a guide rail compensation block with horizontal transverse elasticity is arranged in a guide mechanism between a horizontal table top and a base and is specially used for dynamically compensating centering errors in the horizontal direction; meanwhile, the spring plate assembly is constructed to be composed of multiple layers of stacked spring plates parallel to the horizontal table top, centering errors in the vertical direction are dynamically compensated through bending flexibility of the spring plates in the vertical plane, the working stress is greatly reduced through the multi-layer structure, and the fatigue life is prolonged. By means of the design, unification of high-rigidity excitation force transmission and multi-dimensional dynamic error compensation is achieved, the reliability and precision of equipment are remarkably improved, and the service life of the equipment is remarkably prolonged.

The invention provides a low-frequency excitation and high-frequency impact coupled void lining test device and method, and belongs to the technical field of tunnel instability monitoring, and the device comprises a lining loading system, a low-frequency excitation system and a high-frequency impact system. The loading mechanism simulates the surrounding rock load borne by the lining in the circumferential direction, and the surrounding rock load borne by the lining can be simulated by adjusting parameters such as the magnitude and the direction of loading force. The vibration exciter is matched with the power amplifier, low-frequency and high-amplitude vibration matched with the axle load characteristics of the train can be generated, and the fatigue damage effect on the lining caused by long-term running of the train is simulated. When the electric detacher controls the drop hammer to be separated from the truss and fall freely, high-frequency transient impact force can be generated, and the transient load effect of a lining impacted by falling rocks is simulated. According to the test device, through multi-physics field coupling loading, the problems that a void lining damage mechanism is unclear and prediction means are deficient are solved, a complete technical chain is provided for railway tunnel structure safety, and the test device has academic value and engineering popularization significance.

The invention relates to the technical field of vibrating feeders, and particularly discloses a vibrating feeder which comprises a rack, a vibration exciter and a feeding groove, the feeding groove comprises a first groove body and a second groove body, the second groove body is connected to the lower portion of the first groove body, the second groove body is obliquely arranged rightwards, and at least one layer of screen cloth parallel to the bottom of the second groove body is arranged in the second groove body from bottom to top; the screen divides the second groove into at least an upper groove body and a lower groove body, a partition plate is arranged below the left side of the screen to divide the groove body below the partition plate into a left space and a right space, the screen comprises a fixed column parallel to the second groove and a plurality of movable rods extending in the front-back direction, and an elastic piece is installed between each movable rod and the fixed column. The front end of each layer of groove body is provided with a blocking piece used for sealing the groove body, each blocking piece is provided with an elastic pushing piece, and one side of each elastic pushing piece is further provided with a locking assembly. The size of the screen is small so that cleaning can be facilitated, and the crushing efficiency of the materials is improved by intermittently enabling the materials to fall down.

The invention relates to the technical field of residual stress regulation and control of castings, in particular to a device and a method for regulating and controlling residual stress of a casting after heat treatment. In order to solve the problem that a common method for regulating and controlling the residual stress of the casting after heat treatment is poor in regulating and controlling effect on a stress concentration area or internal residual stress of the casting, the invention provides a device and a method for regulating and controlling the residual stress of the casting after heat treatment. The vibration aging mechanism comprises a vibration reduction platform, an elastic cushion and a vibration exciter, and the elastic cushion is fixed to the upper surface of the vibration reduction platform; the shot peening strengthening mechanism comprises two linear modules, two six-axis mechanical arms and two shot peening assemblies, the two six-axis mechanical arms are fixed to the two linear modules correspondingly, each shot peening assembly comprises a shot peening pipe, and the shot peening pipes are fixed to the tail ends of the six-axis mechanical arms. During use, the vibration aging mechanism and the shot peening strengthening mechanism are used for carrying out synchronous coupling regulation and control on the casting. The regulation and control device is simple in structure and convenient to operate.

The invention discloses a gear meshing time-varying dynamic stiffness measuring device and method based on analysis of rotor vibration characteristics, and belongs to the technical field of test tools. In order to overcome the defects that an existing gear meshing rigidity testing device is complex in structure and large in size, calculation steps of a measuring method are tedious, calculation is complex and time cost is high, a random signal is given to a vibration exciter through a signal generator, and radial random excitation force is applied to the free end of a rotor; obtaining a rotor vibration test transfer function when the bevel gear is engaged; constructing a theoretical model of the rotor-bevel gear meshing system, and calculating vibration response and a theoretical transfer function of a rotor in the rotor-bevel gear meshing system; and deducing the gear meshing dynamic stiffness based on a numerical method by comparing the test transfer function with the theoretical transfer function. The device and the method are mainly used for measuring the gear meshing time-varying dynamic stiffness.

The invention relates to the technical field of strip mine side slope slippage trend early warning, and particularly discloses a strip mine side slope slippage trend early warning system based on active micro-vibration excitation, which comprises the following components: an excitation unit which is composed of a frequency-adjustable micro-vibration exciter which periodically applies low-amplitude controllable mechanical disturbance signals to a side slope rock mass, the rock-soil medium structure response is excited, and the early warning sensitivity is improved; the sensing unit comprises a three-axis acceleration sensor, a displacement meter, a GNSS (Global Navigation Satellite System) sensor and a ground acoustic wave sensor, and is used for recording response change in a vibration disturbance signal propagation process and obtaining data; the analysis unit comprises an edge intelligent terminal, a slippage trend identification model built in the edge intelligent terminal and a lightweight neural network, and the slippage trend identification model performs sensing processing on the data and outputs a slippage trend label; and the communication control unit is used for ensuring that the data streams of the units are stable and cooperatively run with the modules.

The present invention relates to the technical field of sand-dropping machine equipment, and discloses an exciter-type inertial vibration sand-dropping machine, comprising a base, a vibration structure and a screening structure; the base is rectangular, the vibration structure is fixedly arranged on the upper wall of the base, and the screening structure is fixedly arranged on the vibration structure; the present invention has a high-efficiency screening effect; through the synergistic effect of the first vibration component and the second vibration component, the vibration effect of the first screen plate can be improved, and the overall solution can be assembled and structured according to different needs, providing flexibility and customization possibilities to meet the needs of different users and different application scenarios; by setting a toggle structure, especially the design of a toggle rod, it can be reciprocated and tilted under the screen plate, so that the toggle rod can be inserted into the screen hole under the elastic force, effectively preventing the blockage of the screen hole and ensuring the continuity and stability of the screening process.

The invention belongs to the technical field of high-frequency vibration dehydration and medium drainage, and particularly relates to flange type vibration exciter high-frequency vibration dehydration and medium drainage equipment which comprises a vibration excitation base, a motor frame, a vibration excitation body screening mechanism and a pressure rotating type auxiliary vibration mechanism, the motor frame is arranged on one side of the vibration excitation base, the vibration excitation body screening mechanism is arranged on the upper wall of the vibration excitation base, and the pressure rotating type auxiliary vibration mechanism is arranged on the other side of the vibration excitation base. The rotating pressure type auxiliary vibration mechanism is arranged on the vibration excitation body screening mechanism, the vibration excitation body screening mechanism comprises a material screening mechanism, a discharging mechanism and a driving mechanism, the material screening mechanism is arranged on the upper wall of the vibration excitation base, the discharging mechanism is arranged on the inner wall of one end of the material screening mechanism, and the driving mechanism is arranged on the bottom wall of the material screening mechanism. The flange type vibration exciter high-frequency vibration dehydration and medium drainage equipment provided by the invention can accelerate the evaporation speed of moisture on the surface of a material with relatively high humidity, can reduce the probability of blockage of the screen in the material screening process, and can limit the jumping height of the material jumping on the screen.

An unbalance exciter is described, comprising at least two unbalance shafts (21, 22) arranged parallel to each other; wherein each of the unbalance shafts (21, 22) has its own separately controllable drive (23, 24) for generating a drive torque; wherein a coupling device (27) is provided for coupling the two unbalance shafts (21, 22) in opposite directions; wherein the coupling device (27) has a play device (31) for enabling controlled play in the rotational positions of the two unbalance shafts (21, 22) relative to each other; and wherein the play device (31) enables play between the two unbalance shafts (21, 22) with a predetermined angle of rotation, the angle of rotation being selected from a range of 45° to 315°.