372 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 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 provides an implementation method of a novel low-distortion digital modulation direct drive power amplifier device, and relates to the field of plasma generation radio frequency power supplies, the method realizes acquisition of modulation waveform signals through a delta-sigma oversampling technology, and realizes further improvement of the sampling rate of the modulation waveform signals through a PDM pulse distribution unit interpolation filter. The exciter can generate multi-phase PDM modulation waveform pulses and carrier wave driving pulses, and directly drives the power amplifier module to complete carrier wave generation and waveform modulation. Multi-phase PDM modulation can achieve a better modulation waveform THD (Total Harmonic Distortion) index, it is ensured that a modulation waveform signal is basically subjected to distortion-free recovery, but in order to reduce the complexity of a system and give consideration to the modulation waveform total harmonic distortion index, the multi-phase PDM modulation is generally controlled within 12 phases. In addition, a modulation waveform signal is divided into a plurality of equal-amplitude PDM square wave signals by a multi-phase PDM modulation and superposition technology, so that the power amplifier works in an on-off state, and the efficiency of the power amplifier is improved.

The utility model provides a power calibration system of a solid-state high-power AM short-wave transmitter, relates to the technical field of radio and television, and adopts the technical scheme that the system can quickly respond to power deviation and continuously adjust parameters of excitation signals through a control mechanism based on real-time feedback, so that the output power is accurately controlled. After the exciter unit receives the control signal sent by the computer, the optimized excitation signal can be generated, it is ensured that the input signal received by the power amplifier unit is adjusted in advance, and the power amplifier efficiency and the output signal quality can be improved. And the power amplifier unit amplifies the optimized excitation signal into a high-power radio-frequency signal and outputs the high-power radio-frequency signal to complete the whole power amplification process. Through cooperative work of the computer, the exciter unit, the power amplifier unit, the frequency spectrograph and the power meter, a closed-loop control system is formed, and high-precision and high-efficiency power calibration can be realized.

An exciter-equipped glass diaphragm, includes: a glass plate structure; and a first exciter and a second exciter, which are attached to the glass plate structure, in which, when a lowest resonant frequency of the first exciter is F1(0) (Hz), and a lowest resonant frequency of the second exciter is F2(0) (Hz), the exciter-equipped glass diaphragm satisfies: 3≤|F1(0)−F2(0)|≤100 (Hz).

The invention relates to automatic stabilization of an encoder. Novel tools and techniques are provided for implementing an encoder capable of performing a self-correcting process, and more particularly, methods, systems, and apparatus are provided for implementing the encoder capable of performing a process to correct itself during operation of the encoder. In various embodiments, the encoder includes an exciter and a sensor capable of detecting a position of the exciter and generating a signal based on the position of the exciter. The encoder can then perform one or more steps to detect at least one of a first error in an offset of the signal, a second error in a gain of the signal, or a third error in a phase of the signal as the exciter rotates, and correct the signal from the sensor based on the detection of at least one of the first error, the second error, or the third error.

The invention provides a seat air bag control method and system based on music, and belongs to the field of air bag control. The method comprises the steps that a rhythm signal of target music is extracted, and a first control signal is generated according to the rhythm signal; extracting a vibration signal of the target music, and generating a second control signal according to the vibration signal; and controlling an air bag of the target seat according to the first control signal, and controlling an exciter of the target seat according to the second control signal, so that the target seat executes a massage action. According to the music-based seat air bag control method and system provided by the invention, the association degree of the music and the air bag can be improved, and immersive experience of the music is provided for customers.

The invention relates to the technical field of corrosion detection, and discloses an anchor rod non-excavation corrosion detection method and system based on multi-modal mechanical waves, and the method comprises the steps: arranging an exciter on the surface of an anchor rod, generating the multi-modal mechanical waves, and collecting mechanical wave signals in propagation through a multi-point receiver; performing digital processing on the mechanical wave signal, inverting a signal time sequence through time reversal, generating a time reversal mirror image signal, re-injecting the time reversal mirror image signal into the anchor rod, and positioning a corrosion area; and analyzing the characteristic parameters of the time reversal mirror image signal, and calculating the corrosion depth and range in combination with the propagation characteristics of the multi-modal mechanical wave, thereby realizing quantitative evaluation of the corrosion degree. According to the method disclosed by the invention, signal focusing is realized by exciting multi-mode mechanical waves and combining a time reversal mirror image technology, so that a corrosion area can be accurately positioned; the signal quality is optimized through dynamic gain control, and signal attenuation is effectively compensated; the propagation characteristics of multi-modal waves are utilized to cover different depths and ranges, and quantitative evaluation of the corrosion depth and range is achieved.

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 present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of Δf. The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F ≥ 1; wherein the transposition order P is different from the resolution factorF.

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.

Laminated glass speaker systems include at least one pair of asymmetrical piezoelectric exciters within a laminating material used to effectively bond glass panels together. The laminated glass speaker system can be utilized about the vehicle anywhere sound generation is desired, e.g., passenger windows, fixed or sliding roofing systems, front windshield, rear windshield, side windows, rear quarter glasses, and the like. The piezoelectric exciters are generally off-axis relative to a centerline longitudinally extending between the glass panels and act as a diaphragm to produce sound upon vibration.

A musical instrument includes: an acoustic portion that makes sound in response to vibration; an exciter that includes an exciter body and a vibrating portion vibrating with respect to the exciter body, and excites the acoustic portion; and a support portion that is attached to the acoustic portion and supports the exciter body such that the vibration is transmitted from the vibrating portion to the acoustic portion. The support portion supports the exciter body such that the exciter body is elastically displaced with respect to the acoustic portion. A resonance frequency of a vibration system including the exciter body and the support portion is lower than the lowest resonance frequency of the acoustic portion.

The invention provides a buried pipeline positioning device and method based on sound wave reflection time delay. The method comprises the following steps: step 1, setting initial parameters: geophone spacing and vibration exciter position; and step 2, detecting field longitudinal wave velocity test: acquiring signals, calculating sound wave propagation distance and time, and performing linear fitting to obtain the longitudinal wave velocity. And step 3, reflection time delay extraction: the upper computer processes the collected signals, and compares signal waveforms in a similar frequency range to obtain a reflection time delay range. And 4, determining a pipeline position trajectory equation according to the reflection time delay range, and drawing a curve to obtain a pipeline positioning result. According to the method, the buried pipeline can be positioned with high precision and low cost, and the actual engineering requirements are met.

The embodiment of the invention belongs to the technical field of display, and provides display equipment, the display equipment comprises a display panel, lamp panels and an exciter, the vibration output end of the exciter is connected with the splicing position of the lamp panels, vibration force can be transmitted to the lamp panels at the same time, and the vibration area is increased; and the exciter drives the display panel to vibrate and produce sound through the gas in the cavity between the lamp panel and the display panel, so that the acoustic effect is good, and sound and picture integration is easy to realize.

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.