318results about How to "Solve the coupling problem" patented technology

The invention discloses a rotor gravity unloading type magnetic bearing composite motor comprising an external stator, an armature winding, a permanent magnet, a rotor, a magnetic isolation aluminum ring, an internal stator and a suspension control winding. The armature winding is wound in external stator slots. The magnetic isolation aluminum ring is embedded in the rotor. A Halbach type permanent magnet array is surface-mounted on the surface of the rotor. The internal stator has seven internal stator poles including two opposite bias flux magnetic poles, four radial suspension control poles and one gravity direction rotor weight unloading pole. Radial magnetized permanent magnets are surface-mounted on the surface of the bias flux magnetic poles. The suspension control winding is wound on the four suspension control poles. Coupling between the suspension winding and the armature winding in the conventional magnetic suspension motor can be eliminated, and the influence of the rotor weight on suspension control in the conventional suspension motor can also be greatly solved so that the rotor is enabled to stably work at the central balance position without increasing suspension control current, and low power consumption and stable suspension of the magnetic bearing composite motor can be realized.

A method for automatically optimizing the technological parameters in rolling metallic plate or band features use of an automatic control system composed of an in-line automatic measuring unit, a network communication unit and a data processing unit with computer. It includes measuring the rolling force F and advancing value fs, inserting them in a dyadic high-order non-linear equations to find out deforming resistance K and friction coefficient Mu, adaptive learning of the calculation module, and optimizing.

The present invention relates to an optical fibre side edge coupling method for pumping light source, and includes the following steps: using MM optical fibre as pump input optical fibre, DC optical fibre as one fo producing amplifier or laser, removing protecting layer in the MM optical fibre and DC optical fibre coupled zone and coiling the coupled part of DC optical fibre. The coupling of the above-mentioned two optical fibres adopts chemical contact, i.e. they are mutually molten or mutually combined together. Said invention not only raises the coupling efficiency, but also can make DC optical fibre obtain uniformly pumping and can raise the conversion efficiency from pumping light source to optical fibre laser output.

The invention discloses a speed-tension coordination control method for jigger fabrics; the method mainly uses a fuzzy control system to compare the sampling speed of a photoelectric coder with the set speed, and compare the tension-detection value of a tension detection device with the set tension, so as to timely adjust the control rules according to the dynamic changes of the errors to subsectionally and alternately control the speed and the tension to respectively obtain a coiling frequency fA and an unwinding frequency fB needed in maintaining the equal linear velocity constant tension of dyeing fabrics; a coiling electromotor and an unwinding electromotor are respectively controlled by a coiling transducer working in speed mode and an unwinding transducer working in torque conversion mode. The method solves the coupling problem between the speed and the tension of the jigger fabrics and makes more accurate speed-tension coordination control of the double-input/double-output, coupled and time-varying non-linear system of jiggers, so as to reduce dyeing color difference caused by instable speed and tension and improve the dyeing quality of fabrics.

The invention discloses a monolithic integrated six-degree-of-freedom micro-inertial measurement unit and a processing method thereof. The monolithic integrated six-degree-of-freedom micro-inertial measurement unit comprises a main unit structure mounted in the center of a glass substrate in a bonding manner, wherein the main unit structure is square and comprises a triaxial accelerometer unit and a triaxial gyroscope unit; the triaxial gyroscope unit comprises four square frames same in structure; a Z-axis detection structure, a driving structure, a Y-axis detection structure and an X-axis detection structure are connected to the inner side edge of each square frame; the triaxial accelerometer unit comprises a central mass block positioned in the center of the main unit structure and twisting-type mass blocks mounted at four top angles of the main unit structure respectively. The monolithic integrated six-degree-of-freedom micro-inertial measurement unit has the advantages of high measurement precision, strong reliability, high panel utilization rate, full decoupling, small mass, low cost, simple and ingenious volumetric structure and the like, can be used for measuring accelerated speeds and angular speeds in three directions at the same time, and is strong in applicability, thereby having a wide market prospect.

The invention discloses a six-phase permanent-magnet synchronous motor (PMSM) model predictive control method comprising establishing a state space model of a six-phase PMSM by performing discretization on the six-phase PMSM in a natural coordinate system; by acquiring the state information at the kth time, using the current in the fundamental wave subspace as a master control amount and using the current in the harmonic wave subspace as an optimizable controlled amount, establishing an objective function based on torque maximum and harmonic current minimum. The six-phase PMSM model predictive control method is established on the basis of a completely-discretized six-phase PMSM mathematic model and the essential discreteness of the method is liable to digital realization. An experiment verifies the fast responsiveness and the good robustness of the method in real control.

The invention provides an active disturbance rejection control method for cluster spacecraft electromagnetic traction, complexity of a cluster spacecraft system and model uncertainty are fully considered, an electromagnetic force/torque model and a relative motion dynamics equation are established, so that the active disturbance rejection control method formed by a most speed tracking differentiator, a non-linear extension observer and a non-linear feedback control law has good working performance, a coupled problem of a dynamic model is effectively solved, high precise electromagnetic traction control can be realized, and the effectiveness and the Lyapunov asymptotic stability of the method are verified; compared with the control performance of a finite time control method, the control method has better rapidity, vibration resistance ability and disturbance rejection, and the control method is simple in design and has engineering realizability.

The invention discloses an all-fiber electro-optical modulator based on graphene materials and a method of the all-fiber electro-optical modulator. The all-fiber electro-optical modulator based on the graphene materials comprises a single mode fiber, a silicon dioxide groove-type substrate, an Al2O3 transition thin layer and a graphene membrane, wherein the single mode fiber is arranged on the silicon dioxide groove-type substrate and fixed through sealed epoxy glue, a groove is formed in the single mode fiber, the Al2O3 transition thin layer is arranged in the groove, and the graphene membrane is arranged on the Al2O3 transition thin layer. Conductivity performance of graphene is changed through change of voltage applied on a metal electrode, therefore an imaginary part or a real part of an effective refractive index of a graphene composite layer structure is changed, and an electric absorption strength modulator or a phase modulator is achieved. The all-fiber electro-optical modulator based on the graphene materials and the method of the all-fiber electro-optical modulator can achieve design of the all-fiber electro-optical modulator, and have the advantages of being tiny in size, little in power consumption, low in insertion loss, high in modulating speed, beneficial for optical integration and the like. In addition, due to the fact that additional optoelectronic devices are not introduced, the all-fiber electro-optical modulator based on the graphene materials and the method of the all-fiber electro-optical modulator are suitable for being used in an all-fiber communication system and a dense wavelength division multiplexing (DWDM) system.

The invention discloses a method and a system for mobile phone antenna coupling test on a production line. The system comprises a coupling test module, an industrial personal computer, a multi-signal-source device, radio-frequency cables, a combiner and a coupling shielding box. The coupling test module comprises mobile internal test software for coupling test of a to-be-tested mobile phone in set process; the industrial personal computer is connected with the multi-signal-source device and used for configuration of parameters of the multi-signal-source device and controlling a transmission channel of the multi-signal-source device to open or close; the multi-signal-source device under control of the industrial personal computer is used for generating radio-frequency signals with multiple frequency points for mobile phone antenna coupling; the radio-frequency cable is arranged between the multi-signal-source device and the combiner and between the combiner and the coupling shielding box respectively; the coupling shielding box is used for placement of at least one mobile phone and used for broadcast type parallel coupling test of mobile phones. The method and the system for mobile phone antenna coupling test on a production line have the advantage that test efficiency and precision can be improved.

The invention relates to an electromechanical equipment digital twin model consistency maintaining method. The method is applied to digital twinning model consistency of a digital space to a physicalspace. a digital twinning mapping module is arranged between the physical space and the digital space; Electromechanical equipment data collected by a data sensing device in a physical space is mappedto a digital space, and an updated digital twin model is obtained through a data processing module, a performance attenuation updating module and a self-updating digital twin model overall construction module in the digital space. The electromechanical equipment digital twin model consistency maintaining method comprises the following steps: carrying out modal analysis on a performance attenuation part; and analyzing the function static link library file through the modal neutral file, combining the performance attenuation part with other associated part systems, constructing an integrity attenuation updating electromechanical equipment digital twinning model, maintaining the consistency with physical electromechanical equipment in the use period, and providing support for data communication in the whole use period.

The invention discloses a method to measure the parameter distribution of the nonuniform structure of a particle-fluid two phase flow system, which comprises the following steps: 1. determination of the input conditions; 2. establishment of a two-phase equation of momentum and mass conservation of particle-fluid; 3. getting the local void ratio and the local void ratio gradient of particles according to the particles inside grids; 4. dividing the nonuniform structure inside the grids into combinations of local uniform structures according to the local information of the particles, and distributing the rates of flow of the fluid; 5.the distributed rates of flow of fluid are substituted in the equation of momentum and mass conservation to get the results. The problem of coupling between phases of particle-fluid is solved, and the inherent limitations of experience relation equations are overwhelmed.

The invention relates to a D-type optical fiber based graphene electro-optical modulator which is characterized in that one section of an optical fiber (1) is prepared into a D-type groove, graphene (4) is laid on the surface of a D-type optical fiber (2), one end of the graphene (4) is provided with a metal electrode and lead (3), and a film of the graphene (4) is plated with an insulating layer (5); the insulating layer (5) is an Al2O3 insulating layer or an insulating layer with a high dielectric constant, and the insulating layer (5) is plated beside a metal electrode and lead (6) on the film of the graphene (4); and the metal electrode-lead (6) is a conductive electrode, and the conductive electrode is made of Au or Pt. According to the invention, electrical signals are applied to the two electrode and leads so as to generate an electric field perpendicular to the film of the graphene (4), thereby changing the Fermi level of the graphene (4), and further realizing the electro-optical modulating function of the graphene (4) through changing the optical signal absorption strength of the graphene (4).

A method of hydraulic pressure auto-leveling controlled by an adaptive fuzzy-surface switch valve comprises the steps: a neural network is adopted to train the movement characteristics of one-way hydraulic cylinder of each hydraulic pressure support leg of the hydraulic pressure system controlled by the switch valve, the functional relation of travel Z, flow Q, load F and on-off time t is determined, a corresponding model is established; a surface-leveling method of 'adjust surface by using surface' is adopted to cause each hydraulic support leg to move at the same time so as to realize all-way adjustment; an adaptive fuzzy-surface controller is adopted to modify leveling angel, travel and time in real time, obtain the relationship of an angle amendment quantity, travel amendment quantity and time amendment quantity, solve the problem of strong coupling and weak supporting in the process of leveling and realize multipoint adjusting until the demand on horizontal precision is achieved. The method of the invention changes the one-point and one-way adjustment situation existing in the prior art, realizes multipoint adjustment; by adopting the combination of MIMO following-up fuzzy control and surface leveling methods, real decoupling is realized and weak supporting problem is thoroughly solved as well as multipoint decoupling auto-leveling of a hydraulic pressure system controlled by the switch valve of overloading large-span launch or supporting platform is realized.

The invention discloses a coordinated turning control method for a tailless air vehicle on the basis of fusion of multiple controllers and belongs to the technical field of automatic control over air vehicles. According to the coordinated turning control method for the tailless air vehicle on the basis of the fusion of the multiple controllers, the controllers are divided into inner ring controllers and outer ring controllers, wherein robust self-adaptive nonlinear inverse controllers are used as main controllers by the inner ring controllers, H<8> times optimum controllers are used as compensators by the inner ring controllers, and nonlinear inverse controllers are adopted by the outer ring controllers. According to the kinematics characteristics of the tailless air vehicle in the turning process, multiple control methods are fused, and therefore the problems, such as nonlinear coupling, heading static instability and uncertain disturbance, existing in the turning process of the tailless air vehicle are solved. The tailless air vehicle can complete coordinated turning stably, accurately and rapidly by adopting the control mode that the multiple controllers are coordinated and combined.