56results about How to "Increase amplitude" patented technology

The invention discloses a ventilation-sound insulation integrated ultrathin metasurface grating and a using method thereof. The grating is composed of a perforated cover plate, a bottom plate, a plurality of slender cavities with different lengths formed by separating the perforated cover plate and the bottom plate through wall plates, and a peripheral grid-shaped ventilation area. According to the grille, the excellent broadband sound insulation performance can be achieved on the premise that the high ventilation quantity is guaranteed through a thin layer structure with the thickness as low as about 20 mm. The folded labyrinth resonance sound absorption units with gradient lengths are arranged in the non-ventilation area, broadband continuous sound absorption peaks can be generated, and sound absorption replaces sound insulation, so that broadband sound attenuation performance is obtained. Compared with an existing ventilation and sound insulation grille, the grille structure is thinner, larger in ventilation area and wider in working frequency band, the wide engineering application value of the grille structure is shown, a light-weight and low-frequency broadband noise reduction solution is provided for mechanical equipment such as airplanes, warships, high-speed rails and automobiles, and the mechanical equipment can be widely applied to mechanical equipment such as the airplanes, the warships, the high-speed rails and the automobiles. And the method also has wide application prospects in ventilation and sound insulation systems in green buildings.

The invention relates to the technical field of bridge accessory structures, and provides a power generation device using bridge vibration and a bridge, the power generation device comprises a first piezoelectric part and a second piezoelectric part, the first piezoelectric part and the second piezoelectric part are both located in a cavity of a bridge body, and the first piezoelectric part and the second piezoelectric part are arranged in the cavity. One side of the first piezoelectric component is connected with one side of the second piezoelectric component, the other side of the first piezoelectric component is connected to the side wall through a first elastic component, and the other side of the second piezoelectric component is connected to the side wall through a second elastic component. The deformation directions of the first elastic component and the second elastic component are parallel to each other, the second piezoelectric component is compressed when the first piezoelectric component is stretched, and the second piezoelectric component is stretched when the first piezoelectric component is compressed. The device can generate power through vibration generated by the bridge, the power generation efficiency can be improved, and the continuity and stability of power generation are guaranteed.

The invention discloses a Fourier photoacoustic gas detection device and method, and belongs to the technical field of gas detection. In order to solve the problems that the anti-interference capability of an existing Fourier transform photoacoustic spectrum on a sound signal is limited and the detection sensitivity is low, the Fourier photoacoustic gas detection device is designed, and a super-continuum spectrum broadband light source is used as an excitation light source of a photoacoustic effect; uniform intensity modulation of wide-spectrum light is achieved through the intensity modulation assembly, and phase modulation is achieved through the interferometer assembly. The broadband interference light emitted through double modulation acts with gas molecules to generate wide-spectrum mixed sound waves, and the quartz tuning fork sound measurement assembly extracts resonance components in the wide-spectrum mixed sound waves and converts the resonance components into electrical signals; the generated electrical signal is processed by the signal amplification assembly, the phase-sensitive demodulation assembly and the Fourier transform assembly in sequence, and component discrimination and concentration inversion of the target gas are realized by the processed signal.

The invention relates to the technical field of friction stir welding joint post-treatment strengthening, and particularly discloses a friction stir welding joint strengthening device and method based on grinding and laser peening, and the device mainly comprises a movement assembly and a welding joint grinding and laser peening composite strengthening machining head; the moving assembly further comprises a machining platform and a six-axis robot. The welding seam grinding and laser peening composite strengthening machining head further comprises a machining head cross beam, a galvanometer laser head, a laser total reflection mirror, a front grinding wheel and a rear grinding wheel. Polishing and surface strengthening are organically combined, friction heat in the polishing process is fully utilized, the plasticity of the high-strength aluminum alloy in the polishing area is enhanced, laser peening without an absorption layer and a restraint layer can be directly used for strengthening the surface, remarkable microstructure optimization and a residual stress field with a higher amplitude and a larger depth can be obtained, and the surface strengthening effect is improved. Therefore, the friction stir welding joint with smooth surface and high performance is obtained.

The invention belongs to the related technical field of motor control, and discloses a flexible servo system mechanical resonance suppression method and suppression system based on quasi-resonance, and the method comprises the steps: carrying out the speed PID regulation and control of a motor actual rotating speed omega m (k) and a rotating speed instruction omega ref (k) at the kth moment, and obtaining a speed initial regulation and control value u0 (k); inputting q-axis current values iq (k) and omega m (k) at the kth moment into a discretized extended state observer, observing a rotating speed disturbance estimated value # imgabs0 # and compensating the rotating speed disturbance estimated value # imgabs0 # into u0 (k) to obtain u1 (k); discretized quasi-resonance processing is carried out based on the motor rotating speed errors at the (k-2) th moment and the kth moment, OutQR (k) is obtained and compensated to u1 (k), u2 (k) is obtained and input into a current loop, and vector control over the motor inverter bridge is achieved. By means of the method, mechanical resonance can be actively suppressed, meanwhile, system response overshoot is reduced, and the response speed is increased.

The invention discloses a fault diagnosis method and system for a transmission system. The method comprises the steps that a friction power generation sensor is installed on a coupler of the transmission system; collecting output signals of the friction power generation sensor of the transmission system under different working conditions; performing feature extraction and calibration on the output signal to obtain a data set; training and testing a support vector machine by using the data set to obtain a fault diagnosis model; and intelligent fault diagnosis of the transmission system is carried out based on the fault diagnosis model. The friction power generation sensor is installed on the elastic body of the coupler in a specific installation mode, the amplitude of output signals of the friction power generation sensor is effectively improved, the characteristic difference of the output signals under different working conditions is made to be obvious, the accuracy of subsequent model fault type recognition is effectively improved, the structure is compact, installation is convenient and fast, and the application range is wide; a machine learning algorithm is combined to realize automatic identification of transmission system fault types, and the intelligent degree of industrial automation is improved.

The invention discloses a distribution network traveling wave fault identification method based on symplectic geometric mode decomposition. The method comprises the following steps: step 1, sampling a distribution network traveling wave fault current signal; step 2, carrying out two-end symmetric point continuation on the initial signal by adopting a self-adaptive waveform matching endpoint continuation method; 3, using a symplectic geometric mode decomposition method to decompose a distribution network traveling wave initial current signal; step 4, effective components of the continuation components obtained in the step 3 are determined by calculating Pearson's correlation coefficients between construction components, and similar initial components in the effective components are reconstructed by constructing a Pearson's correlation coefficient matrix, so that final symplectic geometric components are obtained; and 5, demodulating the optimized symplectic geometric component by using a frequency weighted energy operator to obtain a time-energy spectrum diagram of the symplectic geometric component, and finally identifying a fault. In combination with ASGMD-FWEO, the method shows excellent performance in the aspects of adaptive preferential selection, interference resistance, noise resistance and the like.

The embodiment of the utility model discloses an ultrasonic scalpel rod, an ultrasonic scalpel handle and an ultrasonic surgical instrument, the ultrasonic scalpel rod transmits ultrasonic waves from the bottom end to the top end, and the top end of the ultrasonic scalpel rod corresponds to the maximum amplitude point of the ultrasonic waves; the length of the ultrasonic scalpel rod is a preset integral multiple of the half-wavelength of ultrasonic waves, and the preset integral multiple is larger than or equal to 5 times and smaller than or equal to 11 times; the area of the cross section of the energy output end of the ultrasonic scalpel rod is gradually reduced from the bottom to the top end. According to the embodiment of the invention, the overall mechanical strength of the cutter bar can be higher, the risk of breakage is reduced, ultrasonic waves can be output with maximum energy, and the surgical effect is improved.

The invention provides a TDDI circuit. The TDDI circuit comprises first to sixth pins, first to second low dropout regulator (LDO) and first to seventh switches. The fourth pin is coupled to the first pin through a first external capacitor and provides a first driving voltage. The fourth pin is coupled to a first lower limit voltage. The fifth pin is coupled to the second pin through a second external capacitor and provides a second driving voltage. The sixth pin is coupled to the third pin through a third external capacitor and provides a substrate voltage. The sixth pin is coupled to a second lower limit voltage and a ground voltage. The first LDO provides a specific voltage. The second LDO provides an output signal. The first switch, the fifth switch and the seventh switch are controlled by a first control signal. The second switch and the sixth switch are controlled by a second control signal. The third switch and the fourth switch are respectively controlled by the third control signal and the fourth control signal.

The invention belongs to the technical field of well drilling equipment, and discloses a thick-wall windowing milling cone which is used for windowing operation of old well casings. The thick-wall windowing milling cone is configured to extend into the casing pipe and windowing the side wall of the casing pipe. The thick-wall windowing milling cone comprises a connector, a drill bit and an eccentric drill bit. Wherein one end of the joint is connected to the driving mechanism; the drill bit is fixedly connected to the end, away from the driving mechanism, of the connector and is configured to cut and mill the side wall of the sleeve. The eccentric bit is eccentrically arranged on the outer end face of the body bit away from the connector. The eccentric drill bit is matched with the main drill bit, and after the eccentric drill bit breaks through the sleeve, due to the eccentric arrangement of the eccentric drill bit relative to the main drill bit, the amplitude of the main drill bit can be improved under the action of rotation and self gravity, so that the impact force of the main drill bit is indirectly improved, and the main drill bit can finish window opening operation more quickly.

The invention discloses an MEMS loudspeaker, a manufacturing method thereof and an electronic device, and the method comprises the steps: providing a semiconductor substrate which comprises a first surface and a second surface which are opposite to each other, and sequentially forming a vibrating diaphragm layer, an insulating layer and a first electrode layer on the first surface of the semiconductor substrate; forming a lithium niobate piezoelectric layer on the first electrode layer; forming a second electrode layer on the lithium niobate piezoelectric layer; patterning the lithium niobate piezoelectric layer, the first electrode layer, the insulating layer and the diaphragm layer to form a vibration structure and a fixed end which are separated by a groove; a flexible covering layer covering the bottom and the side wall of the groove is formed, and the vibration structure is connected with the fixed end through the flexible covering layer; and etching the semiconductor substrate from the second surface of the semiconductor substrate to form a cavity. The sound pressure level of the MEMS loudspeaker can be improved by adopting lithium niobate as the piezoelectric layer, and the amplitude of the vibration structure can be improved by adopting the flexible covering layer to connect the vibration structure and the fixed end.

This utility model discloses a sound-generating unit, including a diaphragm assembly, a frame, a voice coil, and a centering support. The frame includes a housing connecting the diaphragm assembly, and the housing has a connecting arm extending away from the diaphragm assembly. The bottom end of the connecting arm has an outwardly extending extension arm. The connecting arm connects to the inner peripheral wall of the voice coil, and the bottom surface of the voice coil connects to the extension arm. The centering support includes an inner mounting part, a deformation part, and an outer mounting part connected sequentially from the inside to the outside. The bottom surface of the inner mounting part connects to the extension arm. This sound-generating unit effectively improves the connection stability between the voice coil and the frame, reducing the risk of the voice coil falling off. Simultaneously, the inner mounting part of the centering support is directly bonded to the bottom surface of the extension arm, rather than the outer wall or bottom surface of the voice coil in traditional structures. This avoids the limitation of the bonding area caused by the thickness of the voice coil itself, further enhancing the connection reliability between the centering support and the vibration system. Thus, while increasing the amplitude, it significantly improves the structural stability of the large-amplitude sound-generating unit.

The utility model discloses a magnetic confinement hydrogen locking production system which comprises a circulation stirring tank, a magnetic field generator, a temporary storage tank and a canning production line, the circulation stirring tank is communicated with the magnetic field generator, the magnetic field generator is communicated with the temporary storage tank, the temporary storage tank is communicated with the canning production line, and the canning production line is communicated with the temporary storage tank. A polarization area and a solution pipeline arranged in the polarization area are arranged in the magnetic field generator, the solution pipeline is communicated between the circulating stirring tank and the temporary storage tank, and the polarization area can perform magnetic dipole whole-pole paramagnetic treatment on a solution in the solution pipeline; a first magnetic area, a second magnetic area and a third magnetic area are arranged in the polarization area, and the solution pipeline comprises an inlet pipe section, a middle pipe section and an outlet pipe section which are communicated with one another. By adopting the hydrogen-rich water treatment device, hydrogen can be prevented from escaping from water for a long time, so that the quality of hydrogen-rich water is improved, and the quality guarantee period is prolonged.

A laser-ultrahigh frequency pulse arc hybrid welding device comprises a welding gun arranged on a motion execution mechanism, a laser welding head, and an ultrahigh frequency pulse current generating device, a welding power supply and a laser which are respectively connected with the laser welding head, wherein the motion executing mechanism, the welding power source and the laser are connected with the control module to transmit and control laser parameters, motion parameters and electric arc welding parameters, laser beams generated by the laser are input into the laser welding head through optical fibers, and the ultrahigh-frequency pulse current generating device generates ultrahigh-frequency pulse welding current and is connected with the welding power source in parallel. The output end of the welding power source is connected with the welding gun and the workpiece to form a loop, and therefore high-frequency compression electric arcs are generated between the welding gun and the workpiece. The stiffness and stability of the electric arc are improved through the ultrahigh frequency pulse current and the high-frequency compression effect of the ultrasonic electric arc.

The invention relates to the related technical field of anti-collision guardrail prefabrication, and discloses a construction device for concrete pouring of an anti-collision guardrail through an inverted method, the construction device comprises a shell, two semi-ring plates are symmetrically and fixedly arranged on one side of the shell, an operation table is arranged on the other side of the shell, a mold is arranged in the shell, and a vibrating assembly is arranged in the shell; one side of the movable block slides on the inclined surface of the outer side of the lower part of the mold, so that the distance between the shell and the frame body is reduced, the position of the eccentric wheel in the two semi-conical plates is changed, and the vibration frequency of the shell and the movable block is conveniently changed; the two ejector rods get close to each other to drive the two semicircular cylinders and the two semi-conical plates to get close to each other, so that the distance between the two semi-conical plates is reduced, the rolling path of the eccentric wheel is shortened, the vibration output frequency of the shell and the movable block to the mold is changed, and finally the continuously changing vibration output frequency is obtained; therefore, richer vibration waves can be output, and the vibration effect can be improved.

The utility model discloses a test current generating device of a converter grid-connected cabinet, and relates to the technical field of power electronics. The test current generating device of the converter grid-connected cabinet comprises an alternating current source and a transformer, wherein the input end of the alternating current source is configured as the input end of the test current generating device, and the output end of the alternating current source is connected with the primary winding of the transformer; a secondary winding of the transformer is configured as an output end of the test current generating device and is connected with a machine side of the converter grid-connected cabinet; the number of turns of the primary winding is N times that of the secondary winding, so that the voltage output by the alternating current source can be reduced to 1 / N through the transformer; due to energy conservation, under the condition that loss is ignored, the current output by the alternating current source can be expanded to N times through the transformer and then serves as the test current, namely, the amplitude of the test current received by the converter grid-connected cabinet can be improved, and then the large-current test requirement exceeding the set capacity of the alternating current source can be met.

The invention discloses a method and circuit for improving the signal-to-noise ratio of an eddy current angle sensor, and the method comprises the steps: inducing an alternating magnetic field generated by a rotor, and generating a high-frequency carrier signal with rotor angle information; respectively demodulating the positive end and the negative end of the high-frequency carrier signal to realize the separation of the sine and cosine signal with the rotor angle information from the high-frequency carrier signal; amplifying the separated sine and cosine signals with the rotor angle information and the high-frequency carrier signals to enable the signal amplitude to be close to the AD measuring range; filtering the high-frequency carrier signal and the harmonic signal thereof to form a group of differential angle signals; and subtraction and sampling are carried out on the differential angle signals. According to the invention, the angle information of the rotor is received by adopting the resonance principle, the amplitude of a high-frequency carrier signal can be greatly improved, and the magnitude of other interference signals can be suppressed. Meanwhile, signal demodulation, amplification, filtering and AD sampling all adopt a differential mode, interference of common-mode signals can be effectively reduced, and the signal-to-noise ratio and the anti-interference capability of the eddy current angle sensor are improved.

The invention discloses an engineering plastic crushing device, which relates to the technical field of crushing devices, and comprises a crushing frame, a feeding device and a crushing device, wherein a feeding frame is fixedly installed on the top of the crushing frame, an arc panel is fixedly installed on the surface of the feeding frame, a discharge hole is opened on the surface of the crushing frame, a control panel is slidably installed on the surface of the crushing frame, a dust collecting device is fixedly installed on the surface of the control panel, wherein the feeding device comprises a feeding hole, a sliding block, a rotating plate, a feeding plate, a displacement plate, a load-bearing rod and a supporting rod, after the limit of the feeding plate is released, it is squeezed by the plastic on the top to generate rotation, the feeding plate rotates to release the seal of the feeding frame, after the seal of the feeding frame is released, the quantitative plastic on the top of the feeding plate enters the crushing frame through the feeding frame to be crushed, and the quantitative feeding can prevent too much or insufficient plastic from entering the crushing device, reduce the load and wear of the equipment, and extend the service life of the equipment.

The utility model discloses a classifying screen with an automatic screen cleaning anti-blocking structure, which belongs to the technical field of classifying screens and comprises a screen plate used for screening materials, a driving unit used for driving the screen plate to rotate and a machine body used for installing the screen plate and the driving unit. The vibrator is used for providing local exciting force for the sieve plate when the sieve plate is blocked so as to increase the vibration amplitude and vibration frequency of vibration of the sieve plate, the cleaning effect of the sieve plate can be enhanced through the vibrator, the cleaning effect of the bouncing ball can be improved, automatic cleaning in the starting state is achieved, and shutdown for manual cleaning is not needed any more.

The present application relates to the technical field of gas leakage detection, in particular to a photoacoustic spectroscopy trace detection method for gas path system leakage and related device. The photoacoustic spectroscopy trace detection method for gas path system leakage comprises the following steps: emitting specific wavelength laser with double-frequency intensity modulation to the suspected leakage area of the gas path system, the specific wavelength matches two adjacent absorption spectral lines of the target leakage gas, and the frequency difference of the double-frequency intensity modulation corresponds to the frequency interval of the two adjacent absorption spectral lines, so that the leakage gas molecules absorb laser energy of two frequencies at the same time to enhance the amplitude of the periodic photoacoustic signal. Through the cooperation of multiple technical links, the present application effectively solves the problems of weak trace signal, difficult noise suppression and low positioning accuracy in the existing method, and realizes the unification of high-sensitivity trace detection and centimeter-level accurate positioning for gas path system leakage.

This invention discloses a DAC output error correction method based on digital compensation, comprising: collecting amplitude deviation, phase shift, and timing jitter data of the DAC output signal through a quantum sensing DAC calibration and analysis platform to construct a multi-dimensional original error dataset; calling an operational amplifier offset dynamic coupling prediction model to analyze the coupling relationship and extract dynamic correlation features; separating harmonic components and screening error contribution factors based on a broadband DAC harmonic distortion correction model; calculating the gradient change law and extreme point position using a differential nonlinear gradient correction model; integrating the above features and parameters to construct a digital compensation parameter matrix, and dynamically adjusting the output code value through real-time digital modulation to achieve error correction. This method, through multi-model collaborative operation and full-process closed-loop processing, accurately captures the dynamic correlation and distribution characteristics of multi-source errors, achieves synchronous correction of multi-dimensional errors, and improves DAC output accuracy and operating condition adaptability.

The invention discloses a slope compensation circuit of a switching power supply. The slope compensation circuit comprises a current source module, a slope signal generation module, a signal superposition module and a reference level compensation module, the current source module comprises a first current mirror unit and a second current mirror unit, a first current source is arranged on the first current mirror unit, and the first current mirror unit is used for mirroring current of the first current source to the second current mirror unit and outputting the current; the slope signal generation module generates a slope compensation current signal under the control of the enable signal; the signal superposition module superposes the slope compensation current signal and the sampling current of the switching power supply so as to generate a slope compensation control signal; the reference level compensation module performs selectable multi-gear compensation on a reference level so as to generate a compensated reference level; and determining the peak current of the switching power supply based on the slope compensation control signal and the compensated reference level.

The invention belongs to a power electronic electric energy conversion technology, and particularly relates to a medium-voltage bidirectional direct-current converter based on a three-level resonance type DAB and a control method, and the medium-voltage bidirectional direct-current converter comprises N branch three-level resonance type DAB direct-current converter units and a modularized multi-level unit, the three-level resonance type DAB direct-current converter units of all branches are connected with a low-voltage direct-current bus side, and the modularized multi-level units are connected with a medium-voltage direct-current bus. A low-voltage port adopts a parallel structure of an NPC topology of a resonance type DAB to be matched with a direct-current low-voltage bus of the new energy motor, and the characteristics of low voltage and large current of the low-voltage direct-current bus are adapted; the current of the low-voltage direct-current bus is uniformly distributed on the input port of each resonance type DAB circuit, so that the current stress of a switching tube is reduced; a high-frequency isolation frequency converter is arranged in the three-level resonance type DAB structure, so that a low-voltage direct-current bus can be electrically isolated from a medium-voltage direct-current bus, and the electricity utilization safety of the low-voltage side is improved.

The invention discloses a common ground type five-level photovoltaic inverter with a capacitor voltage self-balancing function. The inverter topology comprises a photovoltaic cell, a five-level inverter circuit with a capacitor voltage self-balancing function, a single-phase output LC filter circuit and a single-phase load. Wherein the five-level inverter circuit is composed of a direct-current input filter capacitor Cdc, switched capacitors C1 and C2 and ten switching tubes S1 to S10, S1 is an IGBT (Insulated Gate Bipolar Translator) without a fly-wheel diode, and S2 to S10 are IGBTs with fly-wheel diodes. According to the control method of the inverter, a sine wave reference signal is compared with two paths of in-phase triangular carrier waves and two paths of phase-shifting triangular carrier waves to generate four paths of preprocessing signals, and then logic operation is carried out according to the switching tube conduction relation in six working modes to obtain a control signal. According to the inverter, self-balancing of the switched capacitor voltage can be achieved through mode switching, and the quality of the output voltage is remarkably improved.

The utility model discloses a soybean curing device, which belongs to the technical field of soybean processing, and comprises a screening barrel, a cleaning barrel, a crushing barrel and a curing barrel, a screen mesh is arranged in the screening barrel, a vibration structure is arranged below the screen mesh, and the vibration structure drives the screen mesh to vibrate, so that materials on the screen mesh continuously jump; the cleaning barrel is located on one side of the screening barrel and used for washing the surfaces of the soybeans and removing dust and impurities on the surfaces; the crushing barrel is positioned on one side of the cleaning barrel and is used for crushing the cleaned soybeans; the curing barrel is positioned on one side of the crushing barrel and is used for carrying out heat treatment on the soybeans. The vibration structure is arranged in the screening barrel to be matched with the screen, so that the screen generates stable and continuous vibration, impurities such as soil, stones and shriveled grains are effectively separated through the difference of soybeans and stones in shape, size and density, and high-quality soybean raw materials which are full in grains and free of mildew are accurately screened out.

The invention discloses a compensation differential integrator for a magnetic confinement fusion device and a use method, and relates to the technical field of magnetic confinement fusion, the compensation differential integrator comprises a resistor R1, a resistor R3, an adjustable resistor R2, a capacitor C1 and a first arithmetic unit, the resistor R1 and the adjustable resistor R2 are connected in series, one end of the resistor R1 and the adjustable resistor R2 after series connection forms an outer ring access end, and one end of the resistor R3 forms an inner ring access end; one end of the capacitor C1, the other end of the resistor R3 and the other end of the resistor R1 connected with the adjustable resistor R2 in series are all connected with the input end of the first arithmetic unit, and the other end of the capacitor C1 is connected with the output end of the first arithmetic unit to jointly form the output end of the compensation differential integrator; based on a diamagnetic measurement mode of concentric coils, a circuit is improved on the basis of a common differential integrator, and errors caused by an amplifier and the like are avoided on the basis that the area difference of the two coils does not need to be measured, so that the error influence caused by a traditional integrator is avoided.

The utility model discloses a variable vibration litchi picking device, include: delta parallel mechanism is used for the mobile positioning of litchi picking, variable vibration output mechanism is used for the vibration collection of litchi picking, visual sensor is used for gathering litchi fruit cluster information, control box is used for processing fruit cluster coordinate information and sends control information, wherein, variable vibration output mechanism and visual sensor are installed respectively on the dynamic platform of delta parallel mechanism, and the control box is connected on the fixed platform of delta parallel mechanism, the utility model discloses simple and reliable structure design, convenient to use, and picking positioning is accurate and efficient, and litchi vibration picking efficiency is improved greatly, especially suitable for the vibration collection operation of litchi orchard, and is installed in the field mobile platform, and single operation can realize the vibration collection of most litchi in 1500*2000*200mm range.

The invention relates to a modulation and demodulation method for noise suppression of multiple reverse air chambers, and belongs to the technical field of gas detection. The method comprises the following steps: selecting a DFB laser with specific wavelength and current modulation rate; the sawtooth wave and the sine wave are superposed to generate an original modulation signal; according to a comparison relationship between a sawtooth wave scanning spectrum range and a gas spectrum absorption peak, determining a Gaussian signal amplitude, and generating a Gaussian signal; combining the generated Gaussian signal with the original modulation signal to obtain a variable stepping modulation signal; inputting the variable stepping modulation signal as a driving current into a laser, and driving the laser to emit a laser signal; the laser signal passes through the gas to obtain a gas spectral signal. According to the invention, the Gaussian line type signal similar to the gas absorption peak is superposed on the sawtooth wave signal, so that the current stepping is increased and the scanning time ratio is reduced in the non-absorption section, the current stepping is reduced and the scanning time ratio is increased in the absorption section, and the signal absorption intensity is effectively improved under the condition that the current scanning range is not changed.

The utility model discloses a miniature loudspeaker which comprises a magnetic circuit assembly, a voice coil, a vibrating diaphragm, an FPC assembly and a top plate. The vibrating diaphragm comprises an outer ring body, an inner ring body and an arched part connected between the outer ring body and the inner ring body; the FPC assembly is connected with the vibrating diaphragm and comprises an annular outer ring part, a middle ring part connected with the outer ring part and an inner ring part connected with the middle ring part, the outer ring part, the middle ring part and the inner ring part are each composed of a multi-layer structure, and the number of layers of the middle ring part is smaller than that of the outer ring part and larger than that of the inner ring part; the top plate is connected with the FPC assembly and the vibrating diaphragm and seals the inner ring body. According to the utility model, the overall FPC assembly design effectively ensures the realization of hardness, compliance, quality and process, so that the condition of mass production is met.

The application provides a voltage transformer real-time diagnosis method based on a Hongmeng system, and relates to the field of data processing. In the method, an original sampling sequence is acquired at a Hongmeng system edge computing node and an adaptive sliding window is constructed, a phase reference signal is extracted based on a standard voltage transformer secondary voltage sampling sequence and a power grid actual operating frequency is dynamically estimated, and a variable-length sampling window is generated; under the window, a windowed interpolation spectrum analysis process is performed to obtain a fundamental wave phasor estimation result, a ratio difference result and an angle difference result are calculated, test working condition information is combined to form an error characteristic data record, an error anomaly diagnosis result is obtained through error characteristic knowledge graph and graph neural network reasoning, and a differential processing strategy is executed to complete real-time diagnosis. By implementing the technical solution provided in the application, real-time diagnosis of error sources can be realized while ensuring the calculation accuracy of the ratio difference result and the angle difference result.