234 results about "Exciter" patented technology

A blood pressure monitoring system, comprising: an exciter configured to produce an acoustic signal, the exciter being provided on a first substrate portion; a detector spaced apart from the exciter, the detector being configured to detect the acoustic signal and to produce an electrical output signal, the detector being provided on a second substrate portion that is mechanically or acoustically decoupled from the first substrate portion, wherein the detector comprises at least four detectors; and a processor configured to determine a blood pressure measurement from the electrical output signal.

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 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.

A method for determining variables influencing a total zero point error of a Coriolis mass flow meter comprises: exciting a vibration of a bending vibration mode; measuring a first total zero point error T at a flow of zero; ascertaining a first damping value D of the vibration of the bending vibration mode; measuring an exciter-independent zero point error I during a decaying vibration of the bending vibration mode at a flow of zero; ascertaining a first exciter-dependent contribution E to the first total zero point error T based on the first total zero point error T and based on the exciter-independent zero point error I; and ascertaining a sensitivity factor S for the bending vibration mode based on the first exciter-dependent contribution E to the total zero point error T and based on the first damping value D.

A device and method for representing the foam porosity state of foamed lightweight soil with self-adjusting beams, and relates to the technical field of sound absorption coefficients measurement; the device includes a standing wave tube, a plurality of polyvinylidene fluoride piezoelectric films, a sensor, an exciter, a push-pull handle, an adjustable telescopic tube, a foamed lightweight soil detection material, a charge amplifier, a data memory, a data adapter, a signal generator, an adaptive power amplifier board, and a PC computer; the device of the invention has low cost, long service life, high measurement accuracy, relatively simple production process, and can be applied to different scenarios.

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 utility model discloses a relay which comprises a shell, an internal part, a coil assembly, an exciter and a monitoring control assembly. The internal component is configured to switch the relay between a closed state and an open state in response to an input signal. The coil assembly is used for driving the internal component to move. The exciter is configured to generate gas impact force when the exciter is activated, and the gas impact force is used for driving the internal part to move, so that the relay is switched from a closed state to an open state; the monitoring control assembly is electrically connected with the coil assembly and the exciter, and is configured to monitor a current value passing through the internal part, and control the coil assembly to be powered off or activate the exciter according to a comparison result of the current value, a first threshold value and a second threshold value; the first threshold is smaller than the second threshold. When the current value is larger than or equal to the first threshold value and smaller than the second threshold value, the monitoring control assembly controls the coil assembly to be powered off. When the current value is larger than or equal to the second threshold value, the monitoring control assembly activates the exciter.

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.

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.

An exciter (11, 12) induces an elastic wave in a test object by sequentially giving the object multiple kinds of vibrations having different frequencies. An illuminator (13, 14) performs stroboscopic illumination on a measurement area on the surface of the object. A displacement measurer (15) controls the timing of the stroboscopic illumination with respect to the phase of the elastic wave for each kind of vibration to perform a batch measurement of the displacements, in the off-plane direction of the surface, of the points within the measurement area at least at three different phases of the elastic wave, using speckle interferometry or speckle-shearing interferometry.

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 present invention provides a refrigerator comprising an exciter assembly including a first exciter and a second exciter; a housing including an insulation layer, a first shell, and a second shell; the insulation layer being provided with a first recess and a second recess spaced apart from each other; the first exciter being located within the first recess, and the second exciter being located within the second recess; a portion of the second shell corresponding to the first recess constituting a first vibrating portion, and a portion of the second shell corresponding to the second recess constituting a second vibrating portion; the first exciter being connected to the first vibrating portion, and the second exciter being connected to the second vibrating portion; and the difference in loudness per octave between the sound waves emitted by the first vibrating portion and the sound waves emitted by the second vibrating portion being less than 3dB. The refrigerator provided by the present invention can reduce a user's sensitivity to sound sources.

In an acoustic vibration device that vibrates panel material, a drip-proof structure is added while suppressing an increase in the height dimension. [Solution] The acoustic vibration device 1 comprises a frame 11 fixed to the ceiling interior material 501 side between the ceiling interior material 501 and the outer panel 502 of the vehicle, a vibration unit 12 including a cylindrical body 4 and a magnetic circuit unit 3, a voice coil 52 arranged in the magnetic gap of the magnetic circuit unit 3, a bobbin 51 around which the voice coil 52 is wound, a first damper 61 connecting the cylindrical body 4 and the bobbin 51, a second damper 62 connecting the cylindrical body 4 and the frame 11, and a drip-proof cover 2 to prevent water droplets falling from the outer panel 502 side from adhering to the second damper 62. The drip-proof cover 2 is formed in an annular shape with an open center, is attached to the vibration unit 12, and is positioned on the outer circumference side of the magnetic circuit unit 3 and above the second damper 62. The upper part of the magnetic circuit unit 3 is positioned above the drip-proof cover 2, passing through the opening 23 of the drip-proof cover 2.

The embodiment of the utility model relates to the display technology, in particular to display equipment. The display device comprises the display panel, the backlight assembly and the exciter, the exciter drives the display panel to vibrate and produce sound through the cavity between the backlight assembly and the display panel, the acoustic effect is good, and sound and picture integration is easy to achieve. The actuator of the exciter easily generates a large amount of heat due to reciprocating vibration, the damper is arranged to transfer the heat generated by vibration of the exciter to the side deviating from the vibration output end of the exciter, and a gap is formed between the damper and the backlight assembly; the heat generated by vibration of the exciter can be dissipated through air and also can be dissipated through the damper, so that the temperature of the actuating piece is reduced, the influence of local temperature on the image display quality is reduced, and the image display quality of the display equipment is improved.

The utility model relates to the technical field of musical instruments, in particular to a piano function enhancing device. The utility model provides a piano function enhancing device. The piano function enhancing device comprises a power amplifier and a vibration excitation assembly, the power amplifier is electrically connected with the vibration excitation assembly; the vibration excitation assembly comprises a vibration exciter, a conduction base and a fixing piece, the vibration exciter is fixedly connected with the conduction base, the fixing piece is used for detachably and fixedly connecting the conduction base with a wall bar of the piano, the conduction base is further provided with an abutting face used for abutting against a soundboard of the piano, and the conduction base is fixedly connected with the wall bar of the piano through the abutting face. The abutting surface is used for transmitting vibration of the vibration exciter to a soundboard of the piano. According to the technical scheme, the electronic audio signals are converted into mechanical vibration energy through cooperative work of the power amplifier and the vibration excitation assembly, the function of the piano is enhanced, the piano has the function of a sound box, and the piano can interact with electronic equipment and play the electronic audio signals in the electronic equipment.

The present invention relates to a multi-stage motor initial position estimation method based on low-frequency square wave signal injection. The method sequentially applies square wave voltage low-frequency voltage signals in four directions equivalent to the α-axis, α-axis, β-axis and β-axis of the stator winding of the main motor, and collects the stator winding current of the two-phase exciter in real time. At the end of the injection of the square wave voltage in the four directions within a low-frequency voltage cycle, the estimated main motor excitation current is sequentially collected and saved, and then the sine and cosine signals containing the main motor rotor position information are extracted. The obtained sine and cosine signals are compensated by the inverse tangent and according to the positive and negative value relationship of the sine and cosine signals, and the initial position of the main motor rotor can be uniquely estimated. The method proposed by the present invention is not affected by the salient polarity of the main motor and the initial position of the exciter rotor, has high estimation accuracy, and the signal extraction and position estimation methods are simple, with low requirements on processor performance.

The application discloses a kind of simulation vibration excitation method and system for power transmission tower, belong to electric power engineering and structural health monitoring field, its method includes: obtaining tower finite element model;Deploy flexible exciter array, the array includes permanent magnet adsorption exciter unit and tunable resonance coupling layer;Determine target vibration mode, set mixed excitation parameter set;Perform target mode decoupling cooperative control, produce collaborative drive signal and excite tower;Real-time monitoring dynamic response data and carry out closed-loop control;Finally extract damage identification feature to assess structural safety.The application adopts flexible exciter array, acoustic wave-mechanical hybrid excitation and mode decoupling cooperative control technology, can realize the accurate excitation of specific vibration mode of power transmission tower, solve the problem that traditional excitation device is difficult to simulate low-frequency long-period vibration, improve the simulation fidelity of vibration excitation and the sensitivity of structural damage identification.

Disclosed in the embodiments of the present disclosure are a haptics panel and a haptics apparatus. By means of rationally designing structural parameters of a supporting structure, the resonance frequency of a haptics substrate is within 100 Hz-300 Hz, such that the haptics effect of the haptics panel based on vibration excited by an exciter in a low-frequency range can be effectively improved by means of using the resonance frequency of the haptics substrate; moreover, by means of rationally designing the structural parameters of the supporting structure and also preventing the supporting structure from buckling under the action of static and dynamic loads, the haptics panel can meet the requirements of a haptic design for a vibration amplitude and an acceleration under the condition that the haptics panel meets a rigid design.

The utility model discloses a coal flow unloading point anti-clogging device which comprises unloading baffles arranged on the two sides of a conveying belt, high-frequency vibration exciters are installed on the unloading baffles, and a coal flow height detection device is installed above the conveying belt. The device further comprises a controller, the signal output end of the coal flow height detection device is connected with the signal input end of the controller, and the signal output end of the controller is connected with the high-frequency vibration exciter. When clogging occurs on the conveying belt, materials on the conveying belt are heightened due to accumulation, and after the coal flow height detection device detects that the stacking height of the materials on the conveying belt reaches the upper limit, the controller starts the high-frequency vibration exciter to work, the materials on the conveying belt are dredged through high-frequency vibration of the high-frequency vibration exciter, extrusion of the materials can be prevented, and the conveying belt is prevented from being blocked. Friction between the conveying belt and materials is avoided, the service life of the conveying belt is prolonged, and normal operation of material conveying is guaranteed.

The invention relates to the technical field of bionic interaction, and particularly discloses a bionic robot nose sounding system and a robot. The system comprises a nasal cavity sounding module which comprises a nose sensor and a vibration exciter; an emotion-acoustic parameter mapping table is built in the multi-mode emotion control module, and emotion labels are converted into quantization parameters such as sound pressure level and frequency deviation; the module performs millisecond-level synchronous control on the nose sensor and the vibration exciter through the real-time controller, and dynamically adjusts the emotional intensity of sound production according to mapping parameters. Different from the mode that a traditional robot depends on a non-nose loudspeaker to produce sound, the robot can output voice directly depending on a nose structure by deeply integrating the excitation source and the bionic nose anatomical structure. In combination with real-time accurate regulation and control of multi-modal emotion, the reality sense of close-range man-machine interaction (especially ear language level communication) and the emotion expression adaptation ability in a complex scene are remarkably improved.

The application discloses a high-frequency micro-amplitude exciter for vibration-assisted laser cladding of medium-large workpieces. The parallel cylinders in the exciter are coaxially arranged with equal phase difference. A plurality of partitions are arranged in each cylinder unit with equal phase. The partitions of adjacent cylinder units are arranged with equal phase difference. A plurality of steel balls in each cylinder unit are sequentially thrown to impact the inner wall of the cylinder to generate micro-amplitude vibration. The m*a steel balls in the m cylinders excite micro-vibration of m*a Hz. The amplitude of the workpiece to be processed can be adjusted according to the need. The vibration frequency of the workpiece to be processed can be changed by replacing the number of cylinders and the corresponding installation angle of the cylinders or replacing the number of steel balls in the cylinders. The exciter is especially suitable for vibration-assisted laser cladding, grain refinement, stress release, homogeneous phase and obtaining forged state organization.

The application relates to the technical field of audio-video equipment, and discloses a sound-emitting screen and a projection system. The sound-emitting screen comprises a sound-emitting plate and an optical film. The sound-emitting plate comprises a skin, a reinforcing structure and an exciter. The skin comprises opposite first and second surfaces; the reinforcing structure is fixed to the first surface; the reinforcing structure comprises a plurality of reinforcing plates, the plurality of reinforcing plates separate the first surface into a plurality of sound areas; the exciter is fixed to the first surface; and the exciter is arranged in each sound area. The optical film is fixed to the second surface. The sound-emitting screen provided by the application can enhance the sound area resolution and improve the sound-emitting effect.

The invention relates to the technical field of non-contact small-caliber corrugated pipe modal characteristic testing, in particular to a non-contact small-caliber corrugated pipe modal characteristic testing device. According to the device, force hammer excitation is applied to the small-caliber corrugated pipe to be detected, part of external sound field noise interference is effectively isolated through the wedge type silencing box, response data are synchronously collected through the multiple sound pressure sensors, and modal characteristic parameters of the small-caliber corrugated pipe can be accurately obtained after calculation and analysis. Measurement deviation caused by additional rigidity and mass of a traditional vibration exciter and a traditional contact sensor is overcome, testing precision and reliability are remarkably improved, installation difficulty and complexity of the traditional contact sensor on the small-caliber corrugated pipe are avoided, and an effective means is provided for scientific prediction of modal characteristics of the small-caliber corrugated pipe.

The invention discloses a surface dielectric barrier discharge exciter working mode on-line diagnosis device based on electroacoustic signal coupling characteristics, and belongs to the cross technical field of plasma technology and electrical equipment state monitoring. Voltage and current waveforms and excitation acoustic signals in the discharge process are synchronously collected, and associated characteristics of the voltage and current waveforms and excitation acoustic signals in a time domain, a frequency domain and an energy coupling layer are extracted, so that non-optical and real-time on-line judgment of filamentous discharge, dispersion discharge and a transition state in a typical working mode of surface dielectric barrier discharge is realized. The device does not need high-speed imaging equipment, is suitable for exciter state monitoring and closed-loop regulation and control in severe environments such as flow control, and has the advantages of simple structure, quick response, high environmental adaptability and the like.

The invention provides an acoustic electric exciter with opposite magnetic force and spring force and an output device. The invention relates to an electrodynamic exciter having a voice coil arrangement, a magnetic circuit system and a spring arrangement, in which the magnetic circuit system comprises a (annular) outer magnetic circuit part which extends radially beyond the voice coil arrangement, in which the voice coil arrangement and the outer magnetic circuit part are arranged in a fixed relationship to one another, and in which the spring arrangement is arranged in the outer magnetic circuit part. The magnetic circuit system includes an inner magnetic circuit portion disposed radially within the voice coil device. The spring device couples the inner magnetic circuit portion to the outer magnetic circuit portion and allows relative movement between the inner magnetic circuit portion and the outer magnetic circuit portion in an offset direction parallel to the voice coil axis, where the magnetic force and the spring force are opposite. Further, an output device is disclosed comprising a sound emitting structure and such an electrodynamic actuator connected thereto.

A method for synchronous excitation of multiple exciters relates to the field of dynamic testing and vibration control technology for large civil structures. The method includes the following steps: after constructing a unified time reference based on satellite navigation signals and a rubidium atomic clock, excitation amplitude and phase parameters are obtained based on the target modal requirements, and these parameters are sent to all exciter slave stations; the exciter slave stations generate a reference trajectory based on the excitation amplitude and phase parameters, enabling the exciter motor shaft angle to follow the reference trajectory in real time and output the target excitation; the phase error is obtained based on the measured excitation phase value and the reference trajectory, and then the motor angular velocity of the exciter is corrected based on the phase error. This invention solves the problems of startup phase error and long-term frequency drift in master-slave triggering schemes, ensuring synchronous start-up of all exciters. Combined with dynamic correction of the exciter motor angular velocity, it suppresses phase drift during long-term operation, significantly improving the excitation efficiency of higher-order modes and the clarity of the response signal.

The invention relates to a measuring system comprising an electrical-physical-electrical measuring transducer (10) having at least one vibration element (111), an exciter arrangement coupled to the vibration element for bringing about a measurement effect that is dependent on the measurement variable, and a sensor arrangement coupled to the vibration element for providing a sensor signal (s1) that represents the measurement effect. In addition, the measuring system comprises measuring system electronics (20) electrically connected to the exciter arrangement and sensor arrangement. The measuring system electronics (20) feed electric power into the exciter arrangement by means of an electrical driver signal (e1). The driver signal (e1) contains at least for part of the time a useful component (e1N1) having a predetermined signal frequency and signal amplitude and a useful component (e1N2) having a signal frequency fN2 that deviates from the signal frequency fN1 and a predetermined signal amplitude. In the process, the sensor signal (s1) contains measuring components (s1N1, s1N2) with corresponding signal frequencies fN1 and fN2. The measuring system electronics (20) determine measurement values for at least one measurement variable and detect disruptions of the measuring system if one of the signal amplitudes and / or phases of the measuring components (s1N1, s1N2) has a beat or such a beat is determined.

A medical device with audio output for use in a sterile field may include a housing and an audio output device. The housing may include an interior surface and an exterior surface, the interior surface may define an interior space of the housing including the audio output device, and the interior space of the housing may be fluidically sealed from an external environment by the housing. The audio output device may include a speaker and / or an audio exciter.