7results about How to "Suppress coupling" patented technology

The invention provides a two-wheeled electric vehicle. The two-wheeled electric vehicle comprises: a frame; the wheel at least comprises a front wheel assembly; the steering assembly is located on the front portion of the frame and used for changing the driving direction of the front wheel assembly; the vehicle body covering part comprises an outer covering part located in front of the steering assembly and an inner covering part located behind the steering assembly, and the outer covering part is connected with the inner covering part; the vehicle body covering part further comprises an inner mounting plate located between the outer covering part and the inner covering part, at least part of the inner mounting plate is located in front of the steering assembly, and the inner mounting plate is fixedly connected with the inner covering part. And the electric appliance assembly comprises a controller and a converter, and the controller and the converter are both arranged on the surface of the side, away from the steering assembly, of the inner mounting plate. The problems that in the prior art, electric appliance assemblies at the front end of a two-wheeled electric vehicle are distributed dispersedly, wiring is disordered, and the space utilization rate is low are solved.

The household optical storage all-in-one machine comprises a photovoltaic input Vdc, the two ends of the photovoltaic input Vdc are connected with split capacitors in parallel, and the split capacitors comprise the first split capacitor C1 and the second split capacitor C2 which are connected in series; the second split capacitor C2 is connected with the source electrode of the first switch tube S1, and a first diode D1 is connected in series between the drain electrode of the first switch tube S1 and the midpoint of the first split capacitor C1 and the second split capacitor C2; the active power decoupling circuit is connected in parallel between the drain electrode of the first switching tube S1 and the positive electrode of the first split capacitor C1, the active power decoupling circuit is connected to the non-isolated full-bridge inverter circuit, and the output of the non-isolated full-bridge inverter circuit is connected to the AC side output through the filter circuit. According to the invention, the suppression effect on common-mode current and direct-current side power fluctuation can be realized at the same time.

The invention relates to the field of carbon dioxide catalytic conversion, in particular to a Fe-Co micron alloy catalyst and a preparation method and application thereof.The preparation method includes the steps that firstly, a metal salt solution is subjected to hydrazine hydrate reduction treatment under the strong alkaline condition, and the dosage and reaction time of a cyclohexane dispersing agent and an end-capping reagent PEG-400 are adjusted to prepare Fe-Co micron alloy; and drying in air at room temperature to oxidize the surfaces of alloy particles, and then carrying out H2 reduction treatment to obtain the Fe-Co micron alloy with high-dispersion oxygen vacancies on the surface, and the Fe-Co micron alloy can be directly used for CO2 hydrogenation reaction without subsequent treatment. The catalyst is easy to synthesize and good in stability, the prepared catalyst can achieve methane selectivity of more than 99% in a CO2 hydrogenation reaction, and the CO2 conversion rate in a high-pressure reaction kettle can reach 62.5% within 1 h.

The invention discloses a light-operated terahertz metasurface modulator with an ultrahigh Q value. The light-operated terahertz metasurface modulator comprises a transmission substrate layer and a frequency control structure, the frequency control structure is stacked on the upper surface of the transmission substrate layer; the frequency control structure comprises a surface periodic structure; the surface periodic structure is composed of a plurality of transmission units arranged in a regular matrix. External laser is controlled to apply laser pulses to the light-sensitive material layer of the modulator, so that the light-sensitive material layer generates a large number of optical excitation free carriers, a periodic unit resonator is formed, and the quality factor Q value of transmitted terahertz waves under a specific frequency band is regulated and controlled. Compared with the prior art, the ultra-narrow band-pass filter can realize and regulate ultra-high quality factors under ultra-narrow frequency, is suitable for different occasions, and is simple in structure and convenient to operate.

A linear anti-disturbance control method for suppressing coupling interference of macro-micro linear motion platforms belongs to the field of motor control. The present invention solves the problem that the control law design process of the existing coupling interference suppression method is cumbersome and the decoupling effect is poor. The main technical scheme adopted by the present invention is: step one, establish the mechanical equation of the macro-micro linear motion platform; step two, perform Laplace transform on the established mechanical equation to obtain the equivalent coupling model of the macro-micro linear motion platform; step three, establish the spatial equation of the linear motor and the voice coil motor, estimate the state variables and coupling errors of the macro-motion platform based on the spatial equation of the linear motor and the extended state observer, and estimate the state variables and coupling errors of the micro-motion platform based on the spatial equation of the voice coil motor and the extended state observer; and design a linear state error feedback control law based on the estimated state variables and coupling errors. The method of the present invention can be used to suppress the coupling interference of macro-micro linear motion platforms.

The utility model discloses a small -size base station antenna frame for disaster emergency, including substrate and the MxN antenna array integrated on the substrate, the antenna array is divided into a plurality of pxp sub -matrix that can work independently, and each sub -matrix contains pxp radiating unit and a plurality of radio frequency switches, and each radio frequency switch is connected two adjacent diagonal radiating unit respectively, and each sub -matrix back surface is provided with antenna rotation unit, the utility model divides the antenna array into a plurality of sub -array, adopts radio frequency switch control feed network, supports a variety of sub -array combination mode, and mode switching time reduces from minute level to millisecond level, and disaster response speed is greatly promoted. The utility model positioning accuracy enhances, compared with the traditional scheme >5m precision, adopt the multi -sub -array TDOA joint positioning error of utility model antenna structure <1m. In addition, the coplanar design can directly replace the existing base station antenna, need not structural reconstruction, and the compatibility is strong.

The application discloses an anti-resonant fiber optimization design method and system for infrared waveband transmission, and belongs to the technical field of optical fiber communication, and comprises the following steps: constructing an air-core anti-resonant fiber model for cooperatively optimizing limited loss and bending loss in a target infrared waveband, wherein the air-core anti-resonant fiber model has a five-tube nested structure; selecting a group of key structure parameters to be optimized; determining the theoretical value range of the large-circle wall thickness and the small-circle wall thickness based on the anti-resonant optical principle, and combining with the preparation process constraint to determine the common feasible domain of all the key structure parameters; and cooperatively optimizing through phased parameterization scanning, wherein the optimization parameter subspace is determined through coarse scanning, and the optimal structure parameter combination meeting the preset loss threshold is screened out in the subspace through fine scanning. According to the application, the fiber structure parameters are cooperatively optimized in the 808 nm waveband, the limited loss and the bending loss are significantly reduced, and good process feasibility is ensured.