93results about How to "Good control precision" patented technology

The invention discloses an error correction system of a machine tool XY plane, belonging to the technical field of error correction control of a machine tool system. A system hardware comprises a servo driver and a servo motor, wherein the servo driver is controlled on the basis of an upper computer and a programmable logic controller, and the servo motor is connected with the servo driver; and the working platform of the XY plane is driven by the servo motor via a lead screw, and the upper computer is internally provided with a system error recognition module and a fitting compensation module for the machine tool XY plane. Since the software and the hardware of the system cooperate with each other, the function module of the upper computer can identify the data of a machine tool accuracy error model; by means of the timing compensation of the system, the machine tool can obtain ideal control precision; and meanwhile, a numerical control system is simple and convenient to set compensation data.

The invention discloses a three-degree-of-freedom space simulator and belongs to the field of simulating equipment in the aerospace field. The three-degree-of-freedom space simulator aims to solve the problem that space simulated test equipment is poor in universality, high in cost, complicated in mechanical structure and high in maintenance cost. The three-degree-of-freedom space simulator comprises a two-degree-of-freedom horizontally-moving part and a single-degree-of-freedom rotating part, a high-pressure gas cylinder is adopted by the supporting surface of the simulator, the supporting surface of the simulator is designed according to the air flotation principle, the horizontal movement in the horizontal XY direction of the two-degree-of-freedom horizontally-moving part is achieved through an air floating guide rail, an air floating groove, an X-axis grating ruler and a Y-axis grating ruler, and 360-degree movement in the clockwise direction and in the anticlockwise direction of the single-degree-of-freedom rotating part is achieved through a rotary shaft, a reaction flywheel and a round grating ruler. The simulator further comprises three communication controllers, wherein the three communication controller are used for acquiring the location information in the X-axis direction, the location information in the Y-axis direction, and the location information in the rotation-axis direction respectively and driving nozzles of the simulator to spray air. The three-degree-of-freedom space simulator is used for aerospace tests for simulating the micro-gravity and micro-interference environment of the outer space.

The invention discloses a half circle repetitive controller based on ideal error trends. A controlled object is a servo system, and a reference signal with half circle symmetry property is given so as to construct the ideal error trends; the half circle repetitive controller is designed according to an ideal error trends equation; and a signal calculated by the controller is used as control inputof the controlled object, so that the servo system varies with the reference signal. The half circle repetitive controller based on the ideal error trends reduces memory usage and has better control precision.

The invention relates to a realization method for the real-time transmission of satellite lateral motion image, which is characterized in that: a complete satellite adopts four control antennae for transceiver, so that the control antenna beam is in omnidirectional coverage after the satellite being moved laterally; the complete satellite is controlled to move laterally, continuously and rapidly in a large angle by a momentum wheel; the satellite attitude is measured by using a whirligig in the process of lateral motion; and the satellite crab angle can be calculated in real time, simultaneously, the drift angle can be controlled, so the satellite lateral motion is set to a swinging angle scope stably. In the phase of satellite bias flight, a star sensor and the whirligig are adopted for united attitude determination to the satellite; the camera integral time is calculated in real time by a GPS receiver according to the satellite orbit and latitude; the camera will generate exposure and imaging according to the integral time; the imaging data after the lateral motion can be transmitted to the ground by the satellite through an array data transmission antenna. The realization method for the real-time transmission of satellite lateral motion image has the advantages that: the large-angle lateral motion of the satellite can be realized; thereby the camera development difficulty because of camera wabble or swing mirror addition can be lowered; the visual range of the satellite can be expanded; and the revisit cycle of the satellite can be increased.

The invention relates to an intelligent fresh gas flow and oxygen concentration control device for an anesthesia machine, which comprises a gas mixing cavity, an oxygen input channel, a laughing gas input channel, an air input channel and a PLC control system, the oxygen input channel, the laughing gas input channel and the air input channel are respectively communicated with the gas mixing cavity to output fresh gas, the oxygen input channel, the laughing gas input channel and the air input channel are respectively provided with regulating valves controlled by stepping motors, the stepping motors on the three gas input channels are respectively connected with the PLC control system, and the PLC control system controls the stepping motors on the three gas input channels respectively after calculating according to set fresh gas flow and set oxygen concentration, thus regulating the corresponding regulating valves to realize the flow regulation of the three gas input channels. The device has simple structure, steady gas supply and safe and reliable use and can control the fresh gas flow and the oxygen concentration accurately.

The invention discloses an accelerometer calibration system and an accelerometer calibration method within a low g value range. The calibration system comprises a power source, a collider, an air bearing and an impact acceleration detection module; the impact acceleration detection module comprises an accelerometer, a laser interferometer and a data processing unit; the laser interferometer, the air bearing and the power source are sequentially coaxially arranged along the horizontal direction, and the collider is supported by the air bearing in a suspended manner; the accelerometer and the laser interferometer are electrically connected to the data processing unit. The calibration method comprises the steps of: impacting the collider by the power source, measuring the acceleration speed of the collider by the accelerometer and the laser interferometer respectively, transmitting measuring results to the data processing unit, comparing the measuring results, and thereby completing the calibration process. According to the accelerometer calibration system and the accelerometer calibration method within the low g value range, the control accuracy of peak of the impact acceleration speed is superior to 1%, the repeatability of peak of the impact acceleration speed is superior to 1%, transverse motion of the calibration system is superior to 3%, and uncertainty of measurement for peak of the impact acceleration speed of the calibration system is 0.5%.

The invention belongs to the field of simulators in the field of aerospace and relates to a wireless-transmission-based three-degree-of-freedom space simulator for solving the problem of strong disturbance in a space simulated test device. The simulator comprises a two-degree-of-freedom translation portion, a single-degree-of-freedom rotating portion and three communication controllers, wherein high-pressure gas cylinders are designed among bearing surfaces of the simulator by virtue of an air flotation principle, the two-degree-of-freedom translation portion can realize horizontal movements in X and Y directions by virtue of an air flotation guide rail, an air flotation trough, an X-axis grating ruler and a Y-axis grating ruler, and the single-degree-of-freedom rotating portion can realize the 360-degree clockwise and clockwise movements by virtue of a rotating shaft, a counteractive fly wheel and a round grating ruler; the three communication controllers are used for respectively collecting position information in the X-axis direction, the Y-axis direction and the rotating shaft direction and simultaneously driving nozzles of the simulator to blow and are communicated with an upper computer through wireless modules. The simulator is used for simulating microgravity and micro-interference environments of an outer space in an aerospace experiment.

The invention relates to the technical field of PID control, in particular to a control method and a control system thereof using a PID algorithm. In the improved PID algorithm, besides four basic peripheral parameters, such as a sampling period, a proportionality factor, an integral coefficient and a differential coefficient, six peripheral parameters such as an initial difference, a dead zone difference, a dead zone integral value, a differential period, an integral weighting coefficient and an integral value upper limit are added, and a method for calculating the integral value is also changed, so that through the control method and the control system, intensity reaction can be more reasonably performed and ideal control accuracy can be obtained by more methods.

The present invention discloses a double-direction double-speed positioning control method. At the beginning, equipment is arranged at the point A, and the equipment is required to be positioned at the point O. At the beginning, the equipment moves to the point B at high speed along the close direction and then is changed into low speed closing to move to the point C, the close output of the equipment is switched off, and the equipment keeps on moving under the inertia effect and stops moving at the point D. In the positioning control, the selection of four control parameters can influence the positioning precision and the total time required for positioning, so as to obtain the best value of four parameters. The present invention discloses the method for automatically identifying by the actual movement of the equipment; the present invention also discloses a self-adaptation method of the parameters; the present invention also discloses the control function of eliminating the mechanical gap and the measures for preventing the output from being switched frequently between high speed and low speed and between the low speed and the stop. The positioning control method disclosed by the present invention has the advantages of high positioning precision and fast positioning time.

The invention discloses a cement solidification strength ultra-early prediction method, and belongs to the foundation treatment and sludge solidification. The method comprises the following steps: determining a series of model fitting parameters unrelated to temperature and proportion by development related preliminary experiment at an investigation stage based on a strength increasing model in consideration of the cement solidification sludge under the temperature influence, and then sampling at the cement solidification sludge at the construction stage, and performing early strength acceleration testing under a predetermined high-temperature condition, and predicting the middle and late strength value under the cement solidification sludge construction environment based on the strength testing value under the early high-temperature condition. The cement solidification strength ultra-early prediction method, and belongs to the foundation treatment and sludge solidification disclosed by the invention is simple in operation and high in accuracy, the middle and late period strength prediction can be performed at the early stage of the construction, the early quality control of the cement solidification sludge filling engineering can be realized, the optimal mixing proportion at the construction field can be adjusted as early as possible under the guidance, the problem that the strength sampling inspection is substandard after the construction is finished can be effectively avoided, the curing agent cost and the later solidification cost can be obviously reduced.

An LADRC (linear active disturbance rejection controller) control based three-level shunt active power filter system is characterized by comprising a sampling and conditioning circuit unit, a DSP (digital signal processor) control unit, an IGBT (insulated gate bipolar transistor) isolation driving circuit unit, a protection circuit unit and a main circuit unit. A method of the LADRC control based three-level shunt active power filter system includes the steps of sampling and conditioning, DSP control processing, PWM (pulse width modulation) outputting, driving and transmitting. The control based three-level shunt active power filter system has the advantages that device design in simple, an advanced linear active disturbance rejection technology is adopted, high control accuracy is kept, system reliability is improved greatly, and the system has promising market prospect and engineering application value.

The invention discloses a non-complementary chopping-control intelligent AC voltage-stabilizing and voltage-regulating method and a device. The voltage signal and the current signal of a circuit are collected and processed by a signal collecting module (1) and then converted to a timing control signal by an input signal combining module (2); the timing control signal is input to a timing interlock module (4); and the signals of a PWM wave signal generating module (3) and the timing interlock module (4) are simultaneously input to a signal modulating module (6) to obtain a PWM impulse control signal which is modulated by the timing control signal. The method and the device adopt an embedded single-chip microcomputer as the core to control and complete the processes relating to the power signal collection, the PWM signal generation and regulation, the non-complementary chopping-control signal generation and the circuit protection. Compared with the prior art using the hardware technique or the computer control technique with regard to the PWM signal generation and regulation, the circuit structure is differentiated and improved essentially at the levels, and the control accuracy and the overall stability and reliability are greatly increased .

The invention discloses a method for improving the performance of a rare-earth permanent magnetic material by high temperature compressive stress. The method for improving the performance of the rare-earth permanent magnetic material by high temperature compressive stress at least comprises the following steps: attaching heavy rare-earth compounds to the surface of the sintered magnet; and obtaining the magnet through heating and applying compressive stress at high temperature. According to the invention, the problems of the limitation of the magnet specification and dimension and the inconsistency of the heavy rare-earth diffusion in the traditional process can be overcome by improving the diffusion depth of magnet, therefore, the diffusion effect is enhanced, the magnet can obtain better magnetic performance, the equipment investment is simple, the cost is lower, and the invention is suitable for large-scale promotion.

The invention relates to a novel electronic expansion valve used for cooling, air conditioning and hot pump system. The invention aims at improving a drive mode and a displacement transmitting structure of the electronic expansion valve. The electronic expansion valve of the invention generates a magnetic field to lead a magnetostriction material drive rod to stretch to put a displacement transmitting rod (5) to move when a current is pumped into a loop (8). The displacement transmitting rod (5) then pushes a pushing valve rod (3) to move along a rotary shaft(4) to lead the distance between the valve rod (3) and a liquid inlet; thereby leading the current area of a freezing medium to be changed. Adjusting the current in the loop (8) can control the flow of the freezing medium.

The invention discloses a remote-control intelligent floor lock having a parking place state detecting function.According to the remote-control intelligent floor lock, a Bluetooth communication module is adopted for receiving an external operation instruction, remote control of the floor lock can be completed through a mobile phone with Bluetooth and other mobile equipment, special remote control equipment is not needed, control is easy and convenient, a good encryption effect is achieved, and power consumption is low; terrestrial magnetism intensity data in two axis directions around the floor lock is collected, the floor lock is automatically controlled to be closed according to changes of the terrestrial magnetism intensity data around the floor lock, and control accuracy is good.After it is judged that a vehicle parks on a parking place, the intelligent floor lock is remotely controlled to enter an intermittent working mode, so that the power consumption of a system is effectively lowered; a non-vehicle environment value is automatically updated, it is avoided that when a fixed non-vehicle environment value is adopted, components work for a long time or the external environment changes, so that zero drift is judged by mistake, and meanwhile because correcting and updating are performed according to the previous non-vehicle environment value, occasionality is avoided.

The invention discloses a voltage sampling circuit. The reference ground end of a control circuit and the ground end of a system are connected by a sampling resistor, the source of a power switching tube is connected with the reference ground end of the control circuit, and the voltage detection pin of the sampling voltage is connected with the ground end of the system. When an LED current flows through the sampling resistor, the control circuit obtains a negative sampling voltage, and the control circuit performs conversion to get the absolute value information of a sampling voltage signal so as to control the LED current. By using the control scheme of the invention, the following beneficial effects are achieved: the gate and source voltages of the power switching tube are not affected by the voltage of the sampling resistor, and the phenomenon that the driving voltage is low is avoided; no special ESD treatment is need for the source of the power switching tube, and the size and cost are reduced; and the working current of the control circuit flows through the sampling resistor when the control circuit takes electricity from the drain of the power switching tube, and the control precision of output current is high.

The invention discloses an automatic supply assembly line for umbrella tails and umbrella bodies of umbrellas. The automatic supply assembly line comprises an automatic umbrella tail loading system, a circulating feeding system, an automatic umbrella body feeding system, an assembly system and the like. The automatic umbrella tail loading system comprises a bin, a dropping oblique plane, a conveying groove, a partitioning device, a partitioning connector and the like; the circulating feeding system comprises a conveying assembly, an annular guide rail, a slider, a fetching device, a limiting switch, a dispensing device and the like; the automatic umbrella body feeding system comprises an umbrella body oblique plane, a conveying assembly, V-shaped supports and the like; the assembly system comprises a guide oblique plane, a cylinder assembly and the like. All the systems are controlled by a PLC (programmable logic controller) and are collaboratively operated. The automatic assembly line has the advantages that the automatic umbrella tail assembly system is fully automatic, accordingly, the work efficiency can be greatly improved, all automatic devices are designed according to shape characteristics of the umbrella tails, and the stability of the quality of products can be improved.

A vehicle includes an engine, a first MG (motor generator), a second MG, a planetary gear mechanism provided among the engine, the first MG and the second MG, a battery, and an ECU. The ECU executes batteryless travel control when the battery is abnormal. The batteryless travel control includes engine F/B control for controlling a rotation speed of the engine to become a target rotation speed, and power balance control for controlling a requested driving force to be output and allowing a power generated by the first MG to become equal to a power discharged by the second MG. When the rotation speed of the engine is higher than a threshold speed higher by a prescribed value than the target rotation speed while the batteryless travel control is in execution, the ECU decreases the requested driving force.

The invention discloses a micro-fluidic chip and a method for sorting micro-nano particles by inertia turbulent flow. The micro-fluidic chip comprises an upper-layer substrate and a lower-layer substrate, wherein the upper-layer substrate and the lower-layer substrate are bonded together in a sealing manner to form the micro-fluidic chip; the upper-layer substrate is provided with a liquid inlet hole, an inlet liquid storage tank, an inertia flow channel, a sudden expansion flow channel, a turbulent flow barrier, an inner outlet flow channel, an inner outlet liquid storage tank, an inner liquid outlet hole, an outer outlet flow channel, an outer outlet liquid storage tank and an outer liquid outlet hole; the liquid inlet hole is sequentially communicated with the inlet liquid storage tank,the inertia flow channel and the sudden expansion flow channel; then the liquid is divided into two branches, one branch is sequentially communicated with the inner outlet flow channel, the inner outlet liquid storage pool and the inner liquid outlet hole, and the other branch is sequentially communicated with the outer outlet flow channel, the outer outlet liquid storage pool and the outer liquid outlet hole; and the turbulent flow barrier is positioned in the sudden expansion flow channel. The micro-fluidic chip overcomes the technical bottleneck that the traditional inertial micro-fluidicchip is difficult to accurately sort micro-nano particles, and has the advantages of simple structure, good control precision and high flux.

The invention discloses an RBF neural network generalized inverse internal model control method of a linear motor. A generalized inverse system of a permanent magnet linear motor free of an accurate mathematical model is approached through an RBF neural network; and the generalized inverse system is connected with a permanent magnet linear motor system in series, so that linearization and decoupling of a permanent magnet linear motor control system are achieved; and through correction on a decoupled pseudo linear system through inner model control, the key properties of the control accuracy, the dynamic response capability, the robustness and the like of the permanent magnet linear motor control system are more excellent.