6results about How to "Avoid coupling effects" patented technology

The invention discloses a robust front feedback hybrid active noise control system and method, and belongs to the technical field of active noise control. According to the system provided by the invention, by utilizing the linear prediction filtering subsystem, the broadband auxiliary filtering subsystem and the narrowband auxiliary filtering subsystem, the independence among the feedforward broadband active noise control subsystem, the feedforward narrowband active noise control subsystem and the feedback active noise control subsystem can be improved, and the convergence performance of the whole system is improved; and the separation performance of the broadband auxiliary filtering subsystem and the narrowband auxiliary filtering subsystem on the residual noise is respectively improved by using an efficient self-adaptive variable step size minimum mean square algorithm. The system provided by the invention not only can suppress the wide-narrow band mixed noise component related to the reference signal in the target noise, but also can suppress the narrow-band noise component from other noise sources in the target noise, thereby effectively overcoming the coupling influence among multiple noise sources, improving the noise reduction performance of the system, and widening the practical application range of the system.

This invention discloses a design method for composite material shells of deep-sea pressure-resistant devices and its application. The design method selects four key parameters: initial out-of-roundness amplitude, wall thickness deviation coefficient, hybrid fiber ratio, and difference in elastic modulus between inner and outer fibers. Combining nonlinear finite element analysis and response surface regression techniques, a quantitative prediction model of nonlinear buckling load with respect to the above parameters is established. Based on this, the buckling resistance advantages and performance-cost marginal benefit relationship of hybrid ply configuration are systematically explained from the two dimensions of structural mechanics mechanism and engineering economy.

The application discloses an active magnetic field probe circuit, device, system and electromagnetic interference detection method, wherein the circuit comprises a probe signal acquisition circuit, a full-differential amplifier link and a differential-to-single-end output circuit which are connected in sequence; the input end of the probe signal acquisition circuit is connected to the differential output end of a magnetic field probe sensor, and is used for receiving a raw voltage signal containing a differential mode signal and common mode noise generated by the sensor; the full-differential amplifier link comprises at least two stages of full-differential amplifiers which are connected in cascade; the differential input end of the differential-to-single-end output circuit is connected to the output end of the last stage of the full-differential amplifier link through a direct-current isolation capacitor, and the single-end output end of the differential-to-single-end output circuit is connected in series with an output matching resistor. The circuit of the application improves the accuracy of electromagnetic interference source positioning and the test efficiency.

The application discloses a SoC equalization control method for multiple energy storage units in parallel operation, which comprises the following steps: estimating the SoC of the i-th energy storage unit by using the ampere-hour integration method; obtaining the estimated SoC of other energy storage units through a low-bandwidth communication line, and calculating the average SoC of the n energy storage units in parallel operation; adaptively adjusting the droop coefficient by using the SoC equalization control algorithm to obtain the dynamic correction droop coefficient of the i-th energy storage unit; obtaining the reference output voltage of the converter of the i-th energy storage unit, and obtaining the reference output current of the converter of the i-th energy storage unit by using the voltage loop PI control method; obtaining the switch duty cycle of the converter of the i-th energy storage unit by using the current loop PI control method; and controlling the actions of the switches of the converters of the energy storage units through complementary pulse signals to realize the SoC equalization of the energy storage units in parallel operation. The SoC equalization control method can accurately equalize the SoCs of the energy storage units in parallel operation.

The invention belongs to the technical field of microwaves, and particularly relates to a unit structure of a dual-passband FSR, the dual-passband FSR and an antenna housing, the unit structure comprises an impedance layer and an FSS layer; the impedance layer comprises a first dielectric substrate, double-helix resonance structures, interdigital capacitor structures and connecting wires, the double-helix resonance structures and the interdigital capacitor structures are arranged on the two faces of the first dielectric substrate, the double-helix resonance structures and the interdigital capacitor structures located on the same face are connected through the connecting wires, and resistors are arranged on the connecting wires; the two connecting wires on the two faces of the first dielectric substrate are in a crossed position relation. The FSS layer has a dual annular gap to construct two transport bands. According to the invention, a radar antenna is not influenced at two working frequency bands, radar low detectability is realized through out-of-band wave absorption, dual polarization is realized, the profile is as low as 0.085 # imgabs0 #, and the oblique incidence stability can reach 45 degrees, so that the requirements of low profile, dual polarization and wide-angle performance stability are simultaneously realized.

The invention discloses a pixel circuit, a display panel and a display device. The pixel circuit comprises a first light-emitting control unit, a driving transistor and a compensation unit, the first end of the first light-emitting control unit is electrically connected with a first power supply signal end; the second end of the first light-emitting control unit, the first electrode of the driving transistor and the first end of the compensation unit are connected to a first node; the second end of the compensation unit is electrically connected with the compensation signal end; the control end of the first light-emitting control unit is electrically connected with a light-emitting control signal end; a light-emitting control signal of the light-emitting control signal end begins to generate first voltage jump at a first moment t1 and is kept at a first level in a first time period, a compensation signal of the compensation signal end begins to generate second voltage jump at a second moment t2 and is kept at a second level in a second time period, the first time period and the second time period are overlapped, t1 < = t2, and t2 < = t3. And the jump direction of the first voltage jump is opposite to the jump direction of the second voltage jump. According to the technical scheme, the high-frequency driving visual effect of the display panel can be improved.