38results about How to "Improve static performance" patented technology

The invention relates to a control system of an opening-closing die motor and a push-out motor of a fully-electric injection molding machine, comprising a computer controller, a PLC (Programmable Logic Controller), an opening-closing die push-out driver, the opening-closing die motor and the push-out motor which are mutually connected. The invention also analyzes the motion characteristics and the dynamic characteristics of a toggle lever mechanism of a five-hinge die-closing double-toggle die closing mechanism object, provides a die protection implementation method of a die closing mechanismunder the driving of a fully-electric motor as well as a die closing mechanism control method and a field oriented control algorithm on the basis of a fuzzy adaptive theory from the angle of a control theory, meets the control requirements on three aspects of the die closing force, the speed, and the position, ensures the reliable closing of the molded die and realizes the opening-closing motion of the die and accurate and stably push-out of products from the die; and the designed DSP (Data Signal Processing) driver ensures that the system has stable reliability under the condition of high load and simultaneously improves the disturbance compensation.

The invention discloses a control method of a micro-grid bidirectional DC/DC (Direct Current/Direct Current) change drooping coefficient. The method comprises the following steps: detecting direct current bus voltage Udc and direct current bus current Idc on an output side; inputting the Udc, the Idc, a direct current bus voltage set value Udc<*> and a drooping coefficient initial value k0 into a direct current bus drooping controller; comparing the direct current bus voltage Udc with the direct current bus voltage set value Udc<*> to determine a DC/DC working region and regulating the drooping coefficient of each region; calculating a DC/DC output voltage reference value Udc-ref; transmitting a difference value of the DC/DC output voltage reference value Udc-ref and the direct current bus voltage Udc into a direct current voltage PI (Proportional Integral) regulator, and outputting a given value Idc<*> of a current ring; comparing the Idc<*> with the direct current bus current Idc, inputting the difference value into the direct current PI regulator, and taking the output as a given value of PWM (Pulse Width Modulation); generating PWM wave for controlling switch-on and switch-off of an IGBT (Insulated Gate Bipolar Transistor) to realize constant voltage control of DC/DC. The problem that the DC/DC output power cannot be regulated on line in the drooping control is effectively solved, the dynamic performance and the steady state performance of a direct current converging system are improved, and loop current between energy storage units is reduced.

The invention discloses a weight-coefficient-free double-virtual-voltage-vector predictive torque control method for a five-phase permanent magnet synchronous motor. The method comprises the steps: obtaining a current component under a two-phase static coordinate system and a voltage output at a moment k; carrying out delay compensation of a beat to obtain a current component under a two-phase static coordinate system at a k+1 moment; predicting a magnetic flux linkage and a torque at a k+1 moment; predicting a reference voltage vector required at a k+1 moment according to a magnetic flux linkage and torque dead-beat principle so as to select a first virtual voltage vector; and selecting a second virtual voltage vector according to a voltage error tracking principle, respectively calculating the action time of the two vectors, and synthesizing and outputting. On the basis that the original topological structure of the five-phase permanent magnet synchronous motor drive control system is not changed, harmonic waves in the five-phase motor are effectively restrained through the virtual voltage vectors, and the vectors are directly and quickly selected by adopting a dead-beat principle, so that the calculation burden of a traditional model prediction control method is greatly reduced.

The invention discloses an installation method of an optical fiber aerodynamic force measuring balance and an optical fiber strain gauge for high-ultrasonic speed and low-density air tunnels. The installation method has the advantages that by designing a circular arc channel for positioning installing an optical fiber F-P strain gauge on a measuring beam of the optical fiber aerodynamic force measuring balance, the problems of low installation strength, and easiness in offset of the installation position due to small size of the optical fiber F-P strain gauge can be effectively solved, and theinstallation quality of the optical fiber F-P strain gauge is guaranteed; by designing holes and grooves for leading out optical fibers for each optical fiber strain gauge on a structure body of theoptical fiber aerodynamic force measuring balance, the problem of difficulty in layout of led-out wires in the optical fiber strain gauge can be effectively solved; by establishing an adhering installation technology of the optical fiber F-P strain gauge, the installation quality of the optical fiber strain gauge is guaranteed, the static property of the optical fiber balance is improved, and therequirement of aerodynamic measuring accuracy of the high-ultrasonic speed and low-density air tunnel of an advanced aerospace craft model is met.

The invention discloses a control parameter optimization method and system through vector time series prediction and the expert fuzzy transformation ratio. The control parameter optimization method and system through vector time series prediction and the expert fuzzy transformation ratio can be applied to the fields such as the field of control, the field of decision making and the field of artificial intelligence. According to the scheme, input which serves as control parameter on-line optimization setting is predicted and is output through a vector time series prediction method according to the states of a control system and output time series, a transformation ratio value of the control parameter on-line optimization setting is predicted through an expert rule table or a fuzzy controller to carry out on-line optimization setting on control parameters, and the control parameter optimization method through vector time series prediction and the expert fuzzy transformation ratio is formed by combining the two points and a classic control method, further, a specific device and a specific connection relation are designed, and the control parameter optimization system through vector time series prediction and the expert fuzzy transformation ratio is formed. According to the control parameter optimization method and system through vector time series prediction and the expert fuzzy transformation ratio, on-line optimization setting can be carried out on the control parameters according to difference between the working environments and uncertainty of the working environments, a control system can deal with various sudden environmental changes, dynamic performance, anti-interference performance and static performance are improved, and the defect of overshoot is overcome.

The invention discloses a control parameter setting method of a speed regulating controller in a speed regulating device of a torque motor; a speed regulating device on which the method is based is composed of a speed regulating order generator, a speed regulating controller, a power driving module, a speed regulating executing mechanism and a speed sensor; the setting method comprises the steps of forming a parameter identifying device of the speed regulating executing mechanism; according to a phase step output response feature of the speed regulating executing mechanism, identifying an equivalent viscous damping coefficient and an equivalent inertia of the speed regulating executing mechanism, dividing the maximal output voltage of the power driving module by the maximal value of a speed regulating order, squaring the obtained quotient, multiplying by 5 times and dividing by the equivalent inertia to obtain an integral coefficient of the speed regulating controller; multiplying the equivalent inertia by the integral coefficient of the speed regulating controller and calculating a square root, multiplying by twice, and subtracting the equivalent viscous damping coefficient from the obtained product to obtain a probability distribution function (PDF) coefficient of the speed regulating controller. According to the control parameter setting method, the controlling parameter of the speed regulating controller is precisely set, and the speed of the torque motor is stably regulated within a wide range.

The invention discloses a method for reinforcing a steel tube truss tubular joint through ring opening sleeves. The two semicircular sleeves are adopted in the method, an orifice matched with the position where a reinforced joint main tube intersects with a reinforced joint branch tube is formed in the middle of a straight-line side of each sleeve, and the two orifices are in butt joint to form a round hole; the reinforced joint branch tube is welded to the reinforced joint main tube, and a T-shaped tubular joint is formed; the two sleeves are respectively and oppositely clamped onto the reinforced joint main tube, and the two orifices are oppositely clamped onto the reinforced joint branch tube; the two sleeves are in butt joint to form a welding seam, the upper surface of the welding seam and the lower surface of the welding seam are in butt joint, the two orifices and the surface of the reinforced joint branch tube are welded to form a surrounding welding seam, and the two sleeves are connected to the reinforced joint main tube in a sleeved mode to form two lateral welding seams. According to the method, the static performance of the tubular joint can be improved effectively, the anti-seismic and anti-fatigue performance of the joint can be improved effectively, and therefore it is guaranteed that a tube truss structure has higher bearing capacity, better anti-seismic performance and longer service life.

The invention relates to a multivariable PID controller parameter setting method. The multivariable PID controller parameter setting method comprises following steps of leading in a model of a control system, and generating a reference point set in dependence on the target number of design models and a system sampling method; generating an initial population which is distributed uniformly randomly, wherein each individual in the population is a multivariable PID controller parameter; carrying out genetic algorithm operation to the population by Comprehensively considering a plurality of system performance indexes such as the steady state error, the rise time, the adjusting time and the overshoot to obtain a new population; mixing the obtained new population with the initial population, and achieving multivariable PID controller parameter setting. Under the condition that the same stability index is satisfied, the dynamic performance and the static performance of the optimization scheme provided by the invention are better.

A method for creating a switch reluctance motor memory sensor model. A switch reluctance motor memory sensor circuit model is formed by two current transmitters AD844, an operational amplifier AD826, a memristor, a capacitor, and three resistors. The method for creating a switch reluctance motor memory sensor model enables physical phenomena in a simulation system to be similar to an actual switch reluctance motor system, and is beneficial for direct mathematical simulation of a switch reluctance motor system. The method is simple, can improve static and dynamic performance of a system, and achieves real-time simulation and real-time control of the switch reluctance motor system.

Belonging to the technical field of air conditioner control, the invention discloses an internal model decoupling control method and control system of a variable air volume air conditioner. The methodincludes: building a three-input three-output model adopting air volume, cold supply water flow and fan rotating speed as the input variables and taking room temperature, supply air temperature and static pressure as the output variables; constructing an internal model control structure; and constructing a decoupling network model, which adopts a multiple-input multiple-output internal model decoupling control method for decoupling, and realizes single-input single-output control of the air volume-room temperature, chilled water flow-supply air temperature and draught fan rotating speed-static pressure. According to the invention, internal model decoupling control is adopted to weaken the coupling performance of the control loop with strong coupling performance, namely the air volume-roomtemperature, chilled water temperature-supply air temperature and fan rotating speed-static pressure, to negligible, and when any control variable changes, the influence caused by the coupling loop can be negligible, and the overall stability and robustness of the variable-air volume air conditioning system are improved.

The invention provides a salient point forming device for forming salient points on a preset position on a workpiece, which comprises a base with a concave surface, a heating unit and a molding pin with a spherical surface, wherein the base is arranged at the lower part of the workpiece; the heating unit is used for heating the preset position on the workpiece to improve the ductility of the preset position on the workpiece; the molding pin is arranged at the upper part of the workpiece and the spherical surface of the molding pin aligns with the preset position heated by the heating unit on the workpiece; and before the preset position on the workpiece is stamped by the molding pin, the heating unit effectively improves the ductility and malleability of the preset position on the workpiece, and the stress generated at junctions for salient points is smaller when the molding pin stamps the workpiece. The invention also discloses a salient point forming method, a head gimbal assembly and a manufacturing method thereof.

The invention discloses a novel rotating shaft sealing ring and relates to the technical field of rotating shaft sealing rings. The appearance of a sealing ring body is of a circular structure, a connecting through hole is formed in the center of the sealing ring body, an inner wall is formed at the joint of the connecting through hole and the sealing ring body, an outer wall is formed on the periphery of the sealing ring body, one end face of the sealing ring body is a mounting end face, and the other end of the sealing ring body is a connecting end face. The novel rotating shaft sealing ring has the beneficial effects that the sealing ring is formed by machining an iron material integrated structure, it can be guaranteed that the phenomena of lubricating oil leakage and dust invasion cannot occur when the sealing ring is used in the high-pressure environment of 0-28 MPa, an inner wall groove is formed in the inner wall of the sealing ring body, and an inner wall groove sealing gasket of a double-layer combined structure is installed on the inner wall groove. An end face groove is formed in the connecting end face of the sealing ring body, an end face groove sealing gasket is installed on the end face groove, and the overall practicability is high.