618 results about "Vibration exciter" patented technology

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 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 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 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 invention provides a crimping quality online detection method and system based on acoustic emission signal analysis, relates to the technical field of industrial detection, and solves the technical problems that an existing detection method is not sensitive to early defects and is insufficient in adaptability under complex working conditions. The method comprises the following steps: applying mechanical excitation to the crimping structure, exciting the crimping structure to generate vibration response, and synchronously collecting a vibration response signal and an acoustic emission signal; wherein the mechanical excitation represents sweep frequency excitation or pulse excitation generated by a piezoelectric vibration exciter or an impact hammer so as to excite a plurality of co-frequency offset vibration modes of the crimping structure; calculating the resonant frequency of the crimping structure based on the vibration response signal; calculating frequency offset characteristic parameters according to the resonant frequency based on an inversion method of a physical model; calculating acoustic emission signal characteristic parameters based on the acoustic emission signals; and identifying the type and severity of the crimping defect by utilizing a D-S evidence theory and combining the frequency offset characteristic parameters and the acoustic emission signal characteristic parameters.

The invention discloses a dynamic and static testing device and method for a flexible pressure sensor, and relates to the technical field of sensor testing. The dynamic and static testing device for the flexible pressure sensor comprises a bracket, a pressure applying mechanism, a pressure applying head assembly, a pressure applying head support frame, a sample seat and a control system, the pressure applying mechanism outputs air pressure to the pressure applying head assembly through cooperation of the vibration exciter and the air pressure rod, so that a flexible film in the pressure applying head assembly deforms and further provides pressure applying pressure for a to-be-tested sample in contact with the flexible film; controllable electric signals including constants, lines, trigonometric functions or mutual combination are conveyed to the vibration exciter through the control system, and the electric signals can be converted into corresponding pressure waves through the vibration exciter and are applied to the sample to be tested, so that multi-waveform and multi-mode self-defined pressure waves are output to the sample to be tested; and dynamic parameters such as frequency response, resonant frequency and damping ratio of the flexible pressure sensor can be accurately tested.

The invention relates to the technical field of deep ploughing and fertilizing, in particular to a deep crop weeding and fertilizing all-in-one machine which comprises a mounting frame and a plurality of fertilizer conveying pipes, a plurality of supporting shells and elastic supporting mechanisms are arranged at the bottom of the mounting frame, plough shares are hinged into the supporting shells, and the top ends of the plough shares are connected with the elastic supporting mechanisms; the output end of the fertilizer conveying pipe is provided with an electromagnetic pinch valve, the electromagnetic pinch valve is fixed on the back of the supporting shell, the electromagnetic pinch valve is provided with a mechanical closed driving part, and the mechanical closed driving part is linked with the plough share; a vibration exciter is installed on the supporting shell, and a flow valve is arranged on the fertilizer conveying pipe. The ploughing function and the fertilizing function are integrated, and the working efficiency is high; in the ploughing operation process, when the plough share makes contact with and collides with hard obstacles such as stones existing in soil, the plough share is stored in the supporting shell to be buffered, and the damage phenomena such as deformation and breakage of the plough share caused by too large instantaneous impact force can be prevented.

The invention discloses a performance test method and device for a rotor system excited by a vibration table, and belongs to the technical field of rotary mechanical performance test. The test method comprises the following steps: carrying out resonance search on a tested rotor system; carrying out vibration and static / dynamic force loading on the rotor system; measuring performance parameters of the rotor system in a load state; calculating and stripping the relative motion influence of the measured rotor and the displacement sensor bracket, and correcting the radial error motion value of the rotor; establishing a performance state matrix of the rotor system under each working condition; forming rotor system service suggestion parameters; the testing device mainly comprises an electric vibration exciter, the top end of the electric vibration exciter is fixedly connected with a motor, and the output end of the motor is connected with a rotor system. According to the method and the device, active excitation and load loading are carried out on the rotor system under the stable / non-stable working condition, rapid and synchronous testing of rotation errors, thermal elongation, static rigidity and other performance under the load state can be achieved, and guidance is provided for improvement and optimization and service parameter setting of the rotor system.

The invention discloses a brush wire rigidity detection device for an aero-engine brush seal, belongs to the technical field of aero-engine seal part testing devices, and solves the problem of accurate detection of the brush wire rigidity of the brush seal. Comprising a high-precision annular base (with a sliding rail), a three-axis displacement adjustable sliding block assembly and a bimodal displacement monitoring system composed of a high-speed microscopic vision acquisition module and an infrared laser displacement sensing device. A high-pressure sealed cabin is arranged on the periphery of the base, an intelligent pressure applying mechanism based on the cam-sliding block principle is arranged in the center of the base, a servo motor drives a cam disc to convert rotary motion into high-precision radial displacement, and a force sensing module and a safety gap are integrated to form pressure closed-loop control. The sample fixing device is compatible with samples with different diameters through adjustment of an electrodeless light ring, and a high-frequency vibration exciter simulates a working environment. Force is applied through the pressure applying mechanism, displacement is monitored through the bimodal system, and the rigidity of the brush wire is accurately measured.

The application discloses a pipe jacking construction grouting control method and belongs to the technical field of pipe jacking construction. The purpose is to provide accurate control for the grouting technology in pipe jacking construction. According to the density of stratum, the grouting amount is monitored and controlled in real time through flow meter monitoring and electric switch control. Meanwhile, the grouting holes are arranged along the ring direction on different grouting sections in the pipe jacking direction, so that the grouting can penetrate the whole section, and the wrapping of grouting on the whole pipe jacking section is improved. A plurality of uniformly distributed grouting holes are arranged on the pipe wall of the prefabricated pipe section along the ring direction. A one-way valve is arranged at the outer end of the grouting hole, and a joint for connecting a grouting branch pipe is arranged at the inner end of the grouting hole. A total electromagnetic flow meter, a total electromagnetic pressure gauge and a total electromagnetic ball valve are connected to the grouting main pipe. A branch pipe electromagnetic flow meter, a branch pipe electromagnetic pressure gauge and a branch pipe electromagnetic ball valve are respectively connected to each grouting branch pipe. A plurality of vibration exciters and vibration sensors are fixed on the inner wall of the prefabricated pipe section along the ring direction.

The invention relates to a vibration excitation method and system based on impedance identification, and the method comprises the steps: carrying out the frequency domain conversion of force-speed data obtained by a displacement closed-loop system, and obtaining the mechanical impedance of a drive point; performing flexibility compensation on the mechanical impedance of the driving point to obtain the real impedance of the structure end; extracting an imaginary part and constructing a matching residual error by using the real impedance of the structure end, correcting the excitation frequency of the current vibration exciter through gradient frequency, and iteratively determining the optimal excitation frequency of the vibration exciter meeting a convergence condition; mechanical active power generated by the vibration exciter is calculated under the optimal excitation frequency, dual-target optimization is carried out on the amplitude of the vibration exciter, and the optimal amplitude with the maximum mechanical active power and the minimum equivalent output of the actuator is obtained; based on the real impedance of the structure end, the matching criterion and the optimal amplitude, variable parameters are introduced to construct a source-side impedance model, a source-side impedance matching frequency domain interval is expanded through slow time mark setting parameters, and mechanical active power generated by a vibration exciter is coupled to a tested structure.

The invention discloses a prebaked anode production material conveyor and a control method, and relates to the technical field of prebaked anode production, the prebaked anode production material conveyor comprises a conveyor main body, and the conveyor main body comprises an inner-layer conveying pipe and an outer-layer cooling jacketed pipe coaxially arranged outside the inner-layer conveying pipe; an electromagnetic vibration exciter; the electromagnetic vibration exciter is arranged below the conveyor body and fixedly connected with the inner-layer conveying pipe through a rigid connecting piece, and the feeding module and the discharging module are located at the starting end and the tail end of the conveyor body respectively. The material characteristic identification sensor group is arranged in the feeding module; and the central control system is electrically connected with the material characteristic identification sensor group and the electromagnetic vibration exciter. Safety and environmental protection are guaranteed through a full-sealing structure and an active heat dissipation technology, efficient and general conveying of multi-form materials is achieved through material recognition and self-adaptive vibration control, and continuity and reliability of production are guaranteed in combination with an online self-cleaning system.

The invention discloses a parameter identification test system and method for a tuned mass damping inerter, and the method comprises the steps: generating a signal through a signal generator in a TMDI parameter identification process, converting the signal into mechanical vibration through a vibration exciter after amplification, and enabling the mechanical vibration to act on a main structure equipped with TMDI; a force sensor and a laser displacement sensor are used for obtaining the exciting force borne by the main structure provided with the TMDI and the displacement time sequence under the action of the exciting load; on the basis, based on a mathematical model of the TMDI, seven key parameters including the mass, the rigidity and the damping coefficient of the main structure with the TMDI and the mass, the rigidity, the damping coefficient and the system inertia coefficient of the TMDI are effectively recognized through a global optimization algorithm; the method is accurate in parameter identification, high in identification efficiency and suitable for performance analysis and optimization of various TMDIs.

The utility model discloses a medical CT (Computed Tomography) supporting frame casting core shaking machine overturning supporting structure which comprises a base, supporting legs are fixedly mounted at four corners of the bottom of the base, and a mounting plate is movably connected to the right side of the top of the base. The base, the supporting legs, the mounting plate, the first clamping groove, the first clamping block, a positioning mechanism, a moving groove, a moving plate, a sleeve block, a second clamping block, a bearing, a stud, a threaded groove, a rotating rod, an overturning motor and a vibration exciter support are matched with one another, so that the effect of facilitating transportation is achieved, and the device can be conveniently disassembled into two parts during transportation; therefore, the size of the whole device is greatly reduced, and transportation is facilitated.

The utility model 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 embodiment of the present application provides an engine suspension test bench, method, equipment and storage medium, comprising: a vibration table for restraining and installing an engine and suspension to be tested; a support buffer arranged below the vibration table, used for supporting the vibration table and the engine and suspension to be tested, so that the vibration table and the engine and suspension to be tested are in a suspended state; an exciter arranged on opposite sides of the vibration table, the exciter being used for driving the vibration table to vibrate when in-phase excitation or anti-phase excitation, so as to simulate road vibration; and a controller connected with the exciter, used for in-phase excitation or anti-phase excitation of the exciter. Through the test of the bench of the embodiment of the present application, the vibration performance similar to the road surface can be simulated, the risk assessment and abnormal sound problem reproduction function of the suspension abnormal sound are realized, so that the verification period is shortened and the comprehensiveness of the test is ensured.

A vibrating plate for compacting a floor has an upper mass; a lower mass movable relative to the upper mass; a vibration exciter for generating vibrations for compacting the floor; and a vibration decoupling device arranged between the upper mass and the lower mass. The the upper mass has components selected from the group consisting of a drive for driving the vibration exciter, an energy storage for the drive, a frequency converter, and electronic components. The lower mass has a floor contact plate for introducing the vibrations into the floor to be compacted. The vibration decoupling device has a plurality of attachment points to which the upper mass is attached. The upper mass has a one-piece shell body that at least partially encloses at least some of the components of the upper mass and that is attached to the vibration decoupling device at the attachment points.

The invention discloses a turbine blade crown damping structure vibration characteristic test device and method. The device comprises a workbench, a mounting plate, a blade clamp, a first clamping plate, a second clamping plate, a first limiting block, a second limiting block, a first pressure sensor, a second pressure sensor, a pre-tightening module, a vibration exciter, an acceleration sensor and a control module. During working, the positive pressure of the blade crown is adjusted through the pre-tightening module, the excitation force is directly applied to a test piece through the vibration exciter, and feedback data is obtained through the acceleration sensor. The technical problems that the loading force cannot be adjusted, the loading precision is poor or the loading force is easy to attenuate in the prior art are solved; the universality of the whole test device for turbine blades of different specifications is improved; the coupling interference of the loading mechanism on the excitation signal is avoided; the test process and procedure are simplified, and the test preparation time and efficiency are remarkably improved.

The invention discloses a simulated vibration excitation method and system for a power transmission tower, and belongs to the field of electric power engineering and structural health monitoring, and the method comprises the steps: obtaining a tower finite element model; deploying a flexible vibration exciter array, wherein the array comprises vibration exciter units adsorbed by permanent magnets and a tunable resonance coupling layer; determining a target vibration mode, and setting a hybrid excitation parameter set; target modal decoupling cooperative control is executed, and a cooperative driving signal is generated to excite a tower; monitoring dynamic response data in real time and performing closed-loop control; and finally, extracting damage identification features to evaluate the structural safety. The flexible vibration exciter array, sound wave-mechanical hybrid excitation and modal decoupling cooperative control technology is adopted, accurate excitation of a specific vibration mode of the power transmission tower can be achieved, the problem that a traditional excitation device is difficult to simulate low-frequency long-period vibration is solved, and the simulation fidelity of vibration excitation and the sensitivity of structural damage recognition are improved.

A measuring system includes a vibration-type transducer and electrically coupled measuring system electronics unit for controlling the transducer and evaluating vibration measurement signals provided by the transducer. The exciter arrangement has a vibration exciter which is positioned and aligned such that a drive offset is no more than 0.5% of the tube length. The measuring system electronics are configured to supply electrical power to the vibration exciter by means of an electrical drive signal having a temporally variable electrical current and to provide the drive signal at least intermittently with a sinusoidal second useful current having a second AC frequency, in order to monitor a quality of the measured substance based upon a corresponding second useful signal component of at least one of the vibration measurement signals.

The invention discloses a compensation parameter self-tuning vibration suppression method for a magnetic suspension bearing system, which belongs to the field of magnetic suspension bearing control, and comprises the following steps: S1, carrying out a pulse excitation experiment on a magnetic suspension bearing-rotor system by using an electromagnetic vibration exciter, a magnetic suspension bearing-rotor system model is obtained through parameter identification of the frequency response function; s2, obtaining a phase compensation angle according to the mapping relation of the frequency response function; and S3, according to the system model, designing a compensation controller based on a second-order generalized integral-synchronous rotating coordinate system, and through the system model, the phase compensation angle and stability criterion self-tuning compensation control parameters, realizing vibration suppression of the magnetic suspension system. The method can effectively suppress unbalanced mass vibration of the rotor, compensation parameters do not need to be tested and calibrated in advance, the self-tuning process is rapid and convenient, and the method is suitable for any multi-degree-of-freedom magnetic suspension bearing-rotor system and has good practical value and economic value.

The utility model discloses a modal vibration exciter testing device which comprises a supporting assembly, the supporting assembly comprises a base plate, a movable supporting guide rail plate is fixedly installed at the upper end of the base plate, a sliding groove is formed in the movable supporting guide rail plate, the interior of the sliding groove is connected with a movable block in a sliding mode, and the movable block is connected with the base plate in a sliding mode. One end of the movable block is fixedly provided with a fixed guide column, one end of the fixed guide column is installed at one end of the fixed plate, the guide column, the movable block and the guide rail plate are driven by the lifting hydraulic cylinder to move up and down, accurate position adjustment of the vibration exciter assembly can be achieved, and the vibration exciter is accurately in height butt joint with a to-be-tested structure during installation. It is ensured that the relative position between the vibration exciter and the to-be-tested structure meets the test requirement, the height adjustment of the vibration exciter can be completed in a short time, the overall test efficiency is improved, it is avoided that the vibration exciter and the test structure are installed and connected through an ejector rod due to the fact that the height distance is long, and the ejector rod is not used as a connecting medium; introduction of additional rigidity or damping effect is prevented, characteristics of exciting force are changed, and vibration transmission efficiency is reduced.

The vibration exciter fixing device for pool vibration monitoring comprises a pool, sliding guide rails are arranged at the tops of the two sides of the outer surface of the pool, sliding trolleys are connected to the sliding guide rails in a sliding mode, a movable supporting frame is arranged at the tops of the two sliding trolleys, and a middle protrusion is arranged in the center of the movable supporting frame. The bottom of the middle protrusion is provided with an inner cavity, the top of the inner cavity is fixedly connected with a second telescopic air cylinder, the telescopic end of the second telescopic air cylinder is provided with a top seat, four corners of the bottom of the top seat are provided with connecting rods, the bottoms of the connecting rods are provided with bases, and the center of the bottom of the top seat is fixedly connected with a first telescopic air cylinder. According to the utility model, the vibration exciter can move in the horizontal longitudinal direction and the vertical plane, so that the excitation position of the vibration exciter can be quickly and flexibly adjusted, the condition that excitation is carried out from the outside of a test model in a pool vibration noise test is met, and the device has certain practicability.

The utility model discloses a kind of vibration exciter and electronic equipment, it is related to vibration device technical field, the vibration exciter includes shell, the vibrator subassembly and stator subassembly received in shell, vibrator subassembly is suspended in shell, including annular magnetic conductive plate, annular magnetic conductive plate inner surface opposite side is equipped with first magnet and second magnet;Stator subassembly includes coil and the support of coil fixed in shell, coil is located between first magnet and second magnet;Vibration exciter further includes FPC, FPC includes main part and bending part, main part and bending part are fixed on the outer surface of two adjacent side walls of shell, two first soldering pads are equipped on main part, two second soldering pads are equipped on bending part.The FPC of the vibration exciter and electronic equipment of the utility model embodiment is integrated structure, not only make full use of space, but also assembly welding is convenient, FPC's length can also be reduced, reduce cost.

The utility model discloses a flange type thin oil vibration exciter, and relates to the technical field of vibration exciters. The rotary shaft comprises a fixed shell, a rotary shaft assembly, an inner sleeve, shaft seals and an eccentric block, the two ends of the fixed shell are fixedly communicated with main mounting rings, the shaft seals are movably connected into the two main mounting rings, and bearings are fixed to the ends, close to each other, of the two shaft seals; the shaft body jointly penetrates through the two shaft seals and the two bearings, a shaft sleeve is fixed on the outer peripheral surface of the shaft body between the two bearings, the outer side of the shaft sleeve is movably connected with an inner sleeve, and eccentric blocks are in key connection with the peripheral sides of the shaft body at the ends, far away from each other, of the two shaft seals. Through the arrangement of the fixed shell, the rotating shaft assembly, the inner sleeve, the shaft seal and the eccentric block, the problems that sealing can be achieved only through larger pressing force between the lubricating oil shell and the shaft seal of the flange type thin oil vibration exciter, assembling is inconvenient, and lubricating oil in the whole shell is not used uniformly are solved.

The present invention provides a noise test bench with a fast switching mode, comprising a base, a first test unit, a second test unit, and a power unit disposed between the first and second test units; the power unit includes two exciters arranged in the y-direction; the first test unit can cause the component under test to vibrate in the x, y, and z directions with single degrees of freedom, while the second test unit can cause the component to vibrate in the pitch and roll directions with compound degrees of freedom. The present invention can use the same power unit to drive the first and second test units, respectively. Mode switching requires only moving the component under test a short distance, and both test modes utilize the same power unit. During the second half of the test, since the relevant parameters between the component under test and the power unit have already been acquired in the first half, debugging time between the component and the power unit is significantly reduced, thereby improving test efficiency.

The application belongs to the technical field of vibration exciters, and discloses a high-frequency-response screen sound-producing vibration exciter, which comprises an exciter main body, a plurality of mounting grooves capable of hiding screw rods are arranged on the exciter main body, two rotating shafts are rotatably arranged in the mounting grooves, a threaded sleeve is arranged in the mounting groove, a connecting screw rod for connecting a screen is arranged in the threaded sleeve, and the outer walls of the middle sections of the threaded sleeve are fixedly connected with the two rotating shafts in the mounting groove; after the connecting screw rod is controlled to rotate until the connection between the exciter main body and the screen is disconnected, the connecting screw rod does not need to be completely screwed out of the threaded sleeve, the rotating disc is controlled to rotate until the actuating piece is attached to the limiting protrusion, and then the threaded sleeve and the connecting screw rod are stored in the mounting groove, so that the loss of the connecting screw rod can be avoided.

The invention discloses a gas turbine damping blade vibration characteristic testing device and method under a multi-load loading condition, an electric heating furnace is internally provided with an induction heating coil, and a damping blade test piece is arranged in the induction heating coil; a tenon tooth fixture is mounted on the tenon tooth fixing base, and a tenon tooth part of the damping blade test piece is mounted in the tenon tooth fixture; a loading top block is mounted on the positive pressure loading disc and is in contact with a damping structure of the damping blade test piece; a modal vibration exciter is installed on the vibration excitation support, one end of the large-rigidity-ratio vibration excitation rod is connected with the modal vibration exciter, and the other end of the large-rigidity-ratio vibration excitation rod is connected with the blade body surface of a damping blade test piece. And the optical head is connected with a laser controller and is over against the furnace wall of the electric heating furnace. The change rule of the blade vibration characteristic along with each load factor can be obtained, and the accuracy of the damping blade vibration characteristic analysis method is verified.

The utility model provides a pneumatic and mechanical linkage oscillation mechanism and a passenger massage device.The pneumatic and mechanical linkage oscillation mechanism is arranged in a mounting groove of a bearing part and comprises a vibration exciter, the vibration exciter is arranged in the mounting groove, and the vibration exciter can vibrate in the mounting groove at a set frequency; a pneumatic adjusting part is further arranged on the side, close to and / or away from the opening of the mounting groove, of the vibration exciter, is an air bag body with the variable volume through inflation and deflation, and is used for adjusting the distance between the vibration exciter and the opening of the mounting groove and transmitting vibration. By arranging the vibration exciter, the vibration exciter vibrates in the mounting groove at the set frequency, the massage function can be achieved, the pneumatic adjusting part is arranged on the side, close to and / or away from the opening of the mounting groove, of the vibration exciter, and the pneumatic adjusting part can transmit vibration while adjusting the distance between the vibration exciter and the opening of the mounting groove. The vibration amplitude of the vibration exciter transmitted to the passenger position on one side of the opening of the mounting groove is changed, and then the effect of adjusting the massage strength is achieved.