8results about How to "Stable fluctuation" patented technology

The invention discloses a permanent magnet generator air gap eccentricity fault identification method and system, relates to the technical field of permanent magnet generators, and uses wavelet transform to extract time-frequency features and generate multi-band feature vectors, so that the system can more sensitively identify subtle features of air gap thickness deviation. And the extraction and analysis precision of characteristic signals of different frequency bands is effectively improved. And secondly, analyzing the air gap thickness deviation condition based on the feature vector, constructing an eccentricity degree index, and quantifying the eccentricity degree, so that the severity of the air gap eccentricity fault of the permanent magnet generator can be intuitively judged. And when the eccentricity degree exceeds a set threshold value, the system automatically sends a fault type checking instruction, so that the fault detection process is more intelligent. Afterwards, abnormal changes of all positions are analyzed through infrared thermal data and temperature gradients, air gap foreign matter faults possibly causing air gap eccentricity are further recognized, and the limitation of single signal analysis in traditional detection is made up.

The invention discloses a noise reduction and efficiency improvement pump jet propeller C-shaped circumferential bending stator and a design method, and the method comprises the steps: building a hull-rudder-pump jet propeller calculation model, changing the phase angles theta of the stator at different radiuses, and preliminarily determining the lateral slope distance distribution parameter ai of the C-shaped circumferential bending stator; after a pump-jet propeller provided with a straight stator and a C-shaped circumferential bending stator is arranged in an underwater vehicle, self-propulsion test simulation is carried out, and the thrust and torque of each component of the propellers when the two different propellers are at self-propulsion points are monitored; adjusting a slant distance distribution parameter ai of a bent stator side to obtain different distribution forms of circumferential phase angles of the stator; adjusting geometric attack angles alpha of sections at different radiuses of the stator blade, and selecting the most suitable distribution form of the geometric attack angles alpha as an optimization result; and determining the most suitable chordwise distribution form of the blade section as an optimization result. According to the invention, the bearing force, hydrodynamic noise and structural vibration noise of the submarine propeller are reduced only through the lateral inclination change of the stator blades.

This utility model relates to the field of odor control technology in pulp and paper mills, specifically disclosing an odor stabilizing and safety device for the pulp industry. It includes a pressure-stabilizing tank vertically positioned between the odor collection outlet and the odor treatment equipment. An odor inlet pipe is centrally located at the lower end of the pressure-stabilizing tank, extending into the tank. An emergency odor outlet pipe is centrally located at the upper end of the pressure-stabilizing tank. A sealing pipe is inverted and placed above the odor inlet pipe inside the pressure-stabilizing tank. The sealing pipe is sealed at the top and open at the bottom, with its top not contacting the upper end of the odor inlet pipe. The vertical height of the sealing pipe should be greater than the liquid level difference formed by the maximum and minimum odor pressures. A clean water inlet pipe is located at the lower part of one side of the pressure-stabilizing tank, and an overflow pipe is located in the middle of the other side. This utility model has multiple functions, including odor network pressure stabilization, safety valve, and prevention of odor overflow. One set of equipment integrates the functions of multiple devices, saving both investment costs and installation space.

The invention relates to the technical field of phototherapy masks, and discloses a light source control method, a phototherapy mask and a computer readable storage medium, and the light source control method is used for the phototherapy mask and comprises the steps: obtaining a receiving signal of a receiving end of a wearing sensor, judging the signal transmission condition between the transmitting end of the wearing sensor and the receiving end according to the receiving signal; if the receiving end receives the transmitting signal transmitted by the transmitting end, controlling the light source of the phototherapy mask to be turned off; and if the receiving end does not receive the transmitting signal transmitted by the transmitting end, controlling the light source of the phototherapy mask to be turned on. According to the light source control method provided by the invention, when the receiving end receives the transmitting signal transmitted by the transmitting end, the light source of the phototherapy mask is controlled to be turned off; only when the receiving end does not receive the emission signal emitted by the emission end, the light source of the phototherapy mask is controlled to be turned on, strong light stimulates eyes, great discomfort is avoided, and user experience is improved.

The present invention discloses a method and device for scheduling charging and discharging of electric vehicles, and relates to the technical field of charging and discharging of electric vehicles; predicting a first load curve according to historical power data of a target power grid; obtaining charging information of a plurality of charging vehicles; dividing charging vehicles into non-dispatchable vehicles and dispatchable vehicles; determining the charging power of the non-dispatchable vehicles according to the charging information of the non-dispatchable vehicles, and correcting the first load curve to obtain a second load curve; determining the charging and discharging power of the dispatchable vehicles according to the charging information of the dispatchable vehicles and the second load curve. By predicting and correcting the load curve, combined with the scheduling of the charging and discharging power of the dispatchable vehicles, the system can fill the valley during the low load period of the power grid, and cut the peak during the peak period. By comprehensively utilizing the charging and discharging capabilities of electric vehicles, the fluctuation of the power grid can be effectively stabilized, and the stability and reliability of the power grid can be significantly improved.

This invention relates to a collaborative control method, apparatus, and equipment for a dual-track loading and feeding system, belonging to the field of railway loading technology. In this method, apparatus, and equipment, when the target car reaches a switching threshold during loading, it switches to the replenishment stage. By setting replenishment priority determination rules, the replenishment sequence of the two tracks is clearly defined, avoiding the problem of insufficient or accumulated material in the buffer bin caused by simultaneous replenishment, resolving the conflict problem of dual-track operations, and improving loading efficiency and accuracy. Furthermore, during the replenishment stage, a fuzzy PID fusion collaborative adjustment algorithm is used to adjust the parameters of multiple devices in a coordinated manner, stabilizing the material level in the buffer bin within the ideal range of 30%-50%. This ensures that coal flows directly into the chute with stable flow fluctuations, eliminating the need for secondary leveling, stabilizing the replenishment conditions, and significantly improving loading accuracy. Simultaneously, it avoids equipment overload caused by material accumulation and blockage, reduces the frequency of air cannon activation, and lowers equipment wear and energy consumption.

The invention discloses an inertia response method of a wind storage coupling system, a medium and a system, and the method comprises the steps: S1, obtaining a power grid frequency, and obtaining a power grid frequency change rate according to the power grid frequency; s2, comparing the power grid frequency change rate with a corresponding preset threshold value; when the power grid frequency change rate exceeds a preset threshold value, calculating power required by inertia response; s3, according to the real-time state of the energy storage system, dynamically distributing power required by inertia response to a fan end and an energy storage end for power response; and S4, after the inertia response exits, inputting the energy storage system to realize smooth transition of the active power of the outlet to the state before the inertia response. According to the invention, rapid and accurate response of inertia is realized, fluctuation of the power grid frequency is stabilized, and safety and stability of the power grid frequency are ensured. According to the invention, rapid and accurate response of inertia can be realized, fluctuation of the power grid frequency is stabilized, and safety and stability of the power grid frequency are ensured.

The invention relates to the technical field of preparation of lustrous polyester-nylon superfine fibers, in particular to a preparation method of lustrous polyester-nylon superfine fibers, which comprises the following steps: step S1, raw material preparation, step S2, polyester melt extrusion, step S3, nylon melt extrusion, step S4, composite spinning, step S5, primary stretching, step S6, secondary stretching, step S7, heat setting, and step S8, winding. An existing preparation method of the lustrous polyester-nylon superfine fiber is improved, a special distribution plate structure is used for filtering a polyester melt and a nylon melt in the flow dividing process, impurities in the polyester melt and the nylon melt are removed, the gloss and brightness of the prepared lustrous polyester-nylon superfine fiber are effectively improved, and the lustrous polyester-nylon superfine fiber has a good application prospect. The quality of the lustrous polyester-nylon superfine fiber is further improved.