13results about How to "Solve the coupling problem" patented technology

This invention discloses a live-line detection device and method for partial discharge in GIS (Gas Insulation System), relating to the field of live-line detection of power equipment. The equivalent capacitance between the primary and secondary windings of a current transformer coil is used as a pulse signal coupling channel. Two sets of pulse current signals within the high-voltage conductor of the GIS are acquired through these two pulse signal coupling channels. Then, the partial discharge voltage signal of a specified frequency is extracted through a pulse partial discharge detection circuit. The two extracted pulse signals are output to a differential mode comparison and acquisition module. This module compares the pulse signals input from the two channels, effectively eliminating interference signals. This invention simultaneously solves two problems in GIS live-line partial discharge pulse detection: pulse coupling and high-voltage side partial discharge interference during live operation. It achieves accurate detection of partial discharge during GIS operation, ensuring the safe and stable operation of GIS electrical equipment.

The invention discloses a high-speed heavy-load working condition bearing dynamic stiffness testing device and testing method, and relates to the field of bearing testing. The invention solves the problems that the existing bearing dynamic stiffness test technology and equipment only can load in a single direction, cannot simulate axial and radial composite loading, depends on contact transmission, is insufficient in heavy load bearing, lacks system vibration error suppression measures, and is poor in reliability. And the high-precision test requirement of the independent rolling bearing under the high-speed heavy-load composite working condition is difficult to meet. A shafting supporting module is arranged on the upper portion of a test bench support, a measuring module is located over the shafting supporting module, an axial loading module and a radial loading module apply axial force and radial force to a tested bearing respectively, and a driving module drives a supporting shaft and an inner ring of the tested bearing to rotate. Axial and radial composite loading under the high-speed heavy-load working condition can be achieved, axial and radial displacement can be monitored synchronously, system errors are reduced, and high-precision measurement of the dynamic stiffness of the bearing is achieved.

This invention discloses a method for controlling the downward speed deviation of a hydraulic press slide, belonging to the field of hydraulic press control technology. The method first collects real-time signals of slide position, main cylinder pressure, and oil temperature, and calculates the speed deviation. When the speed deviation continuously exceeds the limit, the system automatically switches from basic PID control to adaptive fuzzy PID control mode. In this mode, the system comprehensively considers the speed deviation, its rate of change, and pressure signals, determines the dominant disturbance type online according to preset rules, and generates targeted compensation commands accordingly. Through a multi-disturbance coordination strategy, the commands are output in an orderly manner to actuators such as proportional valves, cooling valves, and hydraulic pumps. The system monitors the speed deviation in a closed loop, achieving automatic mode recovery or abnormal protection. This invention achieves accurate identification and dynamic compensation of multiple disturbances, significantly improving the control accuracy, anti-interference capability, and system intelligence level of the slide speed.

The application discloses a control system design method for space gravitational wave detection. The method first performs modeling on a problem domain of the control system, constructs a first mapping matrix from a functional requirement to a behavior element, performs decoupling verification on the first mapping matrix until the first mapping matrix is in a lower triangular structure. Then, modeling is performed on a solution domain of the control system, a second mapping matrix from the behavior element to a design parameter is constructed, and independence verification is performed on the second mapping matrix until the second mapping matrix is in a lower triangular structure. Finally, a composite equivalent mapping matrix of the two-level matrix is calculated, and is used for change management of the control system. The application can realize formalized design and quantitative evaluation of a strong coupling control system architecture, identify coupling problems in an early design stage, improve design iteration efficiency and change management accuracy, and is mainly applied to control system design for space gravitational wave detection, and can also be applied to design scenes of various high-coupling high-precision space control systems.

The application discloses a kind of low-speed fixed-wing unmanned aerial vehicle longitudinal controllable field and stability analysis method, comprising: determining the desired working range of angle of attack and track inclination state;Angle of attack and track inclination expected value are substituted into trim calculation, and the trim elevator deflection, trim airspeed and trim thrust are obtained;With angle of attack as horizontal axis, track inclination as vertical axis, the trim elevator deflection, trim airspeed and trim thrust are expressed in the form of contour distribution, and the full-state trim contour distribution diagram is obtained;Introduce aircraft performance constraints and control constraints in the full-state trim contour distribution diagram, and obtain the controllable field;Select the desired working point in the controllable field, calculate the speed, angle of attack trend in the neighborhood of the working point, obtain the speed angle of attack phase diagram, and judge the stability of the working point through the speed angle of attack phase diagram.The application is applied to the technical field of unmanned aerial vehicle, has the advantages of low complexity of trim solution, strong result display intuitiveness and high application analysis efficiency.

This invention discloses a broadband impedance measurement device for high-voltage systems and a voltage regulation method for its sub-modules. Each sub-module of the device consists of a cascaded H-bridge and a floating DC / DC converter connected in series on the DC side. One end of the cascaded H-bridge is connected to the current of each phase of the high-voltage system, and the AC side of the cascaded H-bridges in each sub-module is cascaded. The other end of the cascaded H-bridge is connected to the floating DC / DC converter. One end of the floating DC / DC converter is connected to the cascaded H-bridge, and the other end is floating. The device of this invention controls the energy balance on the bus capacitor of the cascaded H-bridge connected to the DC / DC converter in real time, so that the DC bus voltage remains stable when implementing current injection functions at different frequencies, thereby improving the impedance measurement effect. Through three-phase active and reactive power control, the energy loss on the floating side of the high-frequency DC / DC converter is compensated, a certain voltage range is maintained, and the voltage regulation and balance control effect between phases within the sub-module is improved.

The invention relates to the technical field of chip manufacturing, in particular to a flip photodiode and a manufacturing method thereof.The flip photodiode comprises an epitaxial wafer, a reflecting layer and a lens layer, and a P electrode and an N electrode are arranged on the epitaxial wafer; the lens layer receives an optical signal from the laser, the epitaxial wafer absorbs the optical signal to generate an electric signal, and the electric signal is transmitted through the P electrode and the N electrode; the reflecting layer reflects the optical signal, so that the epitaxial wafer repeatedly absorbs the optical signal; a lens layer is corroded on the back surface of an epitaxial wafer, so that an optical signal enters from the back surface of the photodiode, and the coupling problem of the photodiode with light entering from the back surface and a laser is solved; and on the other hand, the reflecting layer is arranged on the front surface of the photodiode, so that after the optical signal transmitted from the lens layer is absorbed by the epitaxial wafer, the remaining optical signal can be reflected back by the reflecting layer to be continuously absorbed, the thickness of the absorbing layer in the epitaxial wafer is reduced, and the response speed is improved under the condition that the responsivity of the photodiode is not influenced.

This invention provides a method and system for assessing the adaptability of a satellite to the mechanical environment during long-distance transportation after propellant loading, belonging to the field of spacecraft mechanical environment engineering technology. This method aims to solve the challenge of assessing the structural safety and leakage risk of propellant-loaded satellites during long-distance transportation under the coupling of static pressure stress within the propellant tank and dynamic stress during transport. The method includes: establishing a model of the satellite and packaging system; defining the transportation mechanical environment conditions; analyzing and calculating random vibration fatigue strength and impact strength, predicting propellant leakage rate, and conducting a comprehensive assessment. This method employs the mean stress correction theory and the quasi-static transformation method to solve the coupling problem of static and dynamic stresses in fatigue analysis and impact strength verification, respectively, and predicts leakage risk by comparing acceleration response with ground test data. This invention can comprehensively assess the safety of propellant-loaded satellite transportation and supports the optimization of spacecraft development processes.

The application belongs to the field of magnetic resonance sounding signal noise filtering, and is a kind of magnetic resonance sounding signal extraction method based on intelligent optimization manifold learning, the parameter group of the local linear embedding manifold learning method is initialized, the genetic algorithm in the intelligent optimization algorithm is used, the signal-to-noise ratio is taken as the fitness function, and the parameter group in the local linear embedding manifold learning method is optimized, the local linear embedding manifold learning method uses the optimized parameter group to sequentially perform first processing and second processing on the magnetic resonance sounding signal, removes random noise, and obtains the final denoised magnetic resonance sounding signal. The application effectively retains the signal characteristics through the nonlinear dimension reduction of manifold learning, avoids the information loss caused by frequency band selection, maintains the local relationship between data points in the dimension reduction process, ensures that adjacent points in m-dimensional space remain adjacent in d-dimensional space, only compresses and filters noise, and realizes signal extraction.

This invention discloses a tension decoupling control method for a dual-actuator, off-axis cooperative wire feeding system. The method includes: 1. System initialization; 2. Acquiring the current time. k 3. Obtain online identification of rotational inertia; 4. For the current time... k 5. Adaptively adjust the PID gain and decoupling coefficient to obtain the adjusted PID gain and decoupling coefficient; 6. Solve for speed deviation and tension deviation; 7. Perform PID calculation to obtain the current time. k 7. Obtain the decoupled drive speed output and braking tension output; 8. Perform push-pull feedforward correction to obtain the current time. k The final drive command and final braking air pressure command are received; return to step 2 to start the next cycle of control; until the end. This invention uses model-driven control to decouple and eliminate mutual interference, improve dynamic performance through feedforward, and adaptively respond to load changes, thereby achieving independent control of drive and braking.

The invention relates to a motor cross coupling effect identification and compensation method for a multi-degree-of-freedom forming robot. The method comprises the following steps: S1, establishing a kinematics model, a mechanical dynamics model, a permanent magnet synchronous motor dynamics model considering the cross coupling effect and an electromechanical coupling dynamics model of the multi-degree-of-freedom forming robot; s2, establishing a motor cross coupling angle identification model of the multi-degree-of-freedom forming robot in combination with an electromechanical coupling dynamic model; and S3, combining the electromechanical coupling dynamics model and the motor cross coupling angle identification model to establish a multi-degree-of-freedom forming robot dynamics feedback control model, wherein the multi-degree-of-freedom forming robot dynamics feedback control model comprises coupling field orientation control, load feedback control and dynamics feedback control. High-precision and high-efficiency forming of the thin-wall high-rib component is achieved, and the forming precision can be guaranteed on the premise that the forming speed is increased.

The invention relates to a multifunctional heat preservation box for simulating a soft rock shear rheological experiment shear box based on five-field coupling. The invention relates to the technical field of rock mechanics tests, in particular to a multifunctional heat preservation box applied to a THMC-B multi-field coupling shear rheological experimental instrument, which comprises a heat preservation box front part, and an internal electronic temperature display meter and heat preservation glass are mounted on the heat preservation box front part; the thermal insulation box rear part is fixed on the experimental instrument through a vertical steel column and a lateral steel column, a seepage field / chemical field water inlet and a seepage field / chemical field water outlet are formed in the rear part of the thermal insulation box rear part, holes for a horizontal static load electric cylinder, a horizontal dynamic load electric cylinder and a normal dynamic load electric cylinder are reserved in the whole thermal insulation box, and thermal insulation felt cloth is mounted at the openings. The device has the advantages that the device is easy to install and convenient to use, the heat preservation efficiency needed in a temperature field experiment is effectively improved, meanwhile, the temperature of the internal shear box can be detected in real time, and temperature measurement in the experiment is facilitated. Besides, compared with a traditional heat preservation box, the heat preservation box is designed through a novel composite multi-layer material, temperature dissipation and heat exchange of the heat preservation box are greatly reduced, and the heat preservation box has the advantage of being beneficial to popularization and test.

The invention discloses a CEB waste heat recovery safety system and method based on the metal fiber surface combustion technology, the system comprises a CEB direct combustion device, a combined air inducing device, a waste heat recovery unit and a control unit, the combined air inducing device is arranged at the rear end of a smoke outlet of the CEB direct combustion device, and an air inducing channel and an emergency discharge channel are arranged in the combined air inducing device in parallel; the control unit monitors system pressure parameters in real time, controls the air inducing channel to be opened under the normal working condition, and introduces high-temperature flue gas into the waste heat recovery unit for heat energy recovery. When it is monitored that the pressure exceeds a safety threshold value, the combined air inducing device is immediately controlled to be switched to an emergency relief channel, smoke is directly exhausted into the atmosphere, and rapid pressure relief is achieved. By means of a double-channel switching mechanism of the combined air inducing device, the adaptability problem of CEB direct combustion equipment and a waste heat recovery system under the fluctuating load is effectively solved, and the safety of the CEB direct combustion equipment and the waste heat recovery system is improved. The device has efficient waste heat recovery and intrinsic safety protection capabilities, and is suitable for storage and transportation tank areas, loading platforms and other scenes where waste gas loads fluctuate severely.