234results about How to "Precise and stable control" patented technology

An improved system and method for controlling ozone concentration in connection with a multi-chamber tool. The system and method involve a first and a second concentration controller in combination with an ozone generator. The first concentration controller detects an EVENT (i.e., one of the chambers in the multi-chamber tool coming on-line or off-line) and in response provides a power instruction to the ozone generator in accordance with a predictive control algorithm. The first concentration controller has a fast (i.e, about 1 second) response time. The second concentration controller is masked from the ozone generator during the EVENT, but otherwise controls the generator after an interval of time has lapsed after the EVENT. The second concentration controller has a slower response time than the first concentration controller, however the second concentration controller provides the system with long-term stability and can be used to provide updated data to the predictive control algorithm.

The invention discloses a device for controlling temperature and uniformity of epitaxial wafers in an MOCVD (metal organometallic chemistry vapor deposition) system. A group of non-contact optical thermometers is arranged above a tray along the radial direction to feed back the temperature of single or a plurality of epitaxial wafers in a plurality of annular areas. A temperature controller independently controls the power output of a plurality of heating elements below the tray by using difference minimization of a statistical average value of the temperatures of the epitaxial wafers and an epitaxial process specified temperature as a target. The plurality of epitaxial wafers in each annular area are correspondingly heated by using one or more lower adjacent heating elements which are arranged annularly and have small radial coverage area so as to effectively balance the radial heat loss of the epitaxial wafers and the tray under the process condition of different temperatures and realize accurate and stable control of the temperature and the uniformly between the single epitaxial wafers and the adjacent epitaxial wafers. The device is also provided with a contact thermocouple thermometer for measuring a heater temperature serving as a reference point of the epitaxial process specified temperature and meanwhile monitoring whether the heater works normally.

The invention discloses an aeration underground drip irrigation system which comprises a water source, a delivery main pipe (6), a delivery branch pipe (10) and an irrigation capillary (11), wherein abooster pump (5) is connected in series with the delivery main pipe (6). The aeration underground drip irrigation system is characterized in that an aeration chamber (1) is connected in parallel withthe delivery main pipe (6), a micropore aeration part (7) is arranged in the aeration chamber (1), an air compressor (2) is communicated with the aeration part (7) in the aeration chamber (1) througha gas cylinder (3) and a ventilation hose (8) with a one-way valve (9), and a branch ventilation pipe (14) communicated with the aeration chamber (1) is arranged between the one-way valve (9) and a gas flow control valve (13). The aeration underground drip irrigation system can realize the three functions of ordinary underground drip irrigation, aeration underground drip irrigation and simple underground ventilation through water gas supply and valve control, has simple structure, low cost, less energy loss, controllable aeration ratio, wide aeration range, convenient use, management and maintenance and labor saving, and simultaneously can dissolve fertilizer into water, simultaneously irrigate the fertilizer, the water and gas, improve the utilization efficiency of the fertilizer and reduce the pollution for soil and underground water.

The invention provides a combination automatic control method with a single-joint manipulator under mixed suspension microgravity environments. The combination automatic control method comprises the following steps of 1, enabling a combination to be equivalent to an underwater robot, and establishing a kinematics equation and a dynamics equation; 2, approximating the dynamics equation of the combination by a radial basis function neural network, so as to obtain control force and control torque corresponding to the radial basis function neural network; 3, using a sliding mode control method, so as to obtain control force and control torque corresponding to sliding model control; 4, synthesizing the control force and control torque corresponding to the neural network and the control force and control torque obtained by the sliding model control method, and distributing thrust, so as to obtain a general vector which consists of thrust and joint torque of each propeller; approximating the thrust deviation of the corresponding thruster through the radial basis function neural network, so as to obtain the estimation value of the thrust deviation; 5, combining the results obtained in step 2, step 3 and step 4, obtaining the general vector consisting of the thrust and the joint torque of the corresponding propeller, and further obtaining the thrust and the joint torque of the corresponding propeller, so as to realize the automatic control.

The invention relates to a solid fermentation bioreactor. The reactor comprises a reaction casing , and a porous material layer separator plate (5) is arranged in the reaction casing to divide the reaction casing into an upper fermentation chamber (1) and a lower layer air chamber (3); the reactor also comprises a fermentation control system for controlling a stirring unit, a temperature control unit, a humidity control unit, an air feed control unit and a fermentation tail gas detection and processing unit, so as to realize real time monitoring and control on temperature, humidity, ventilation, stirring and tail gas. The invention realizes totally enclosing on-line fermentation and prevents extraneous pollutants from entering; the tail gas detection system carries out real time on-line monitoring on fermentation gas, and tail gas is treated by tail gas recovery equipment to protect the environment, thereby realizing coupling operation of temperature, humidity, ventilation, stirring and tail gas control system and ensuring necessary essential factors for microbe growth.

A method for regulating the production of steam from feed water in an evaporator of a steam plant is provided. A state regulator calculates a plurality of states of a medium in the evaporator by means of an observer and, on the basis thereof, determines a feed water mass flow rate as a regulating variable. In order to obtain a stable and precise regulation of the temperature of the steam, the state regulator is a linear-quadratic regulator.

The invention provides a dual-purpose fertilizing device capable of accurately preparing a fertilizer and irrigating clear water and an EC+PH adjusting method thereof. According to the device, a water feeding system and a fertilizer feeding system are arranged in a fertilizer mixing tank; a backflow pipeline is arranged on the fertilizer mixing tank and a fertilizer feeding pipeline; a fertilizer concentration acquisition device and a pH acquisition device are arranged on the backflow pipeline, and are connected with a fertilizer preparation control system respectively through data lines; and the fertilizer preparation control system is electrically connected with a fertilizer suction electromagnetic valve and a fertilizing pump. Key parameters of an algorithm and a control way are adjusted in real time according to a parameter change situation on the basis of a closed-loop control principle and PID (Proportion Integration Differentiation) adjustment and in combination with the object features of a fertilizer liquid reaction process, in particular the non-linear process features of PH parameter change, and accurate and stable control of EC and PH of a fertilizer liquid is realized by using a most proper control strategy and corresponding regulation and control parameters under different working conditions of a fertilizer preparation reaction process.

The invention discloses an agricultural machinery roll angle test method based on double antenna GNSS (global navigation satellite system) receiver / gyroscope information fusion. The white noise of the roll angle measured by a double antenna GNSS receiver is great, and the roll angle cannot be easily and directly used for agricultural machinery posture correction. The gyroscope output data is stable; the short-time stability is high, but the long-period precision is poor. A Kalman filter is used for performing fusion processing on the roll angle obtained by the double antenna GNSS receiver and the roll angular velocity obtained by a gyroscope; the precise estimation of the agricultural machinery roll angle is obtained. The method has the advantages that more continuous and stable agricultural machinery roll angle data can be formed, so that the tilt correction of the agricultural machinery is more precise.

The invention provides a cantilever crane system, which comprises a plurality of joint arms which are sequentially hinged through horizontal hinge shafts and further comprises two length sensors installed on each joint arm. One length sensor is used for measuring the length of the corresponding joint arms after deformation, the other length sensor is used for measuring the length between the length sensor and the tail end of the corresponding joint arms, and a preset distance is retained between the two length sensors. A dip angle sensor is installed on each joint arm, and an included angle formed by a connection line of the two length sensors and a reference plane is obtained. According to detection results of the dip angle sensors and the length sensors, a processor obtains cantilever crane system terminal end location parameters. By means of the cantilever crane system, single dip angle sensors and double draw line encoders are adopted for single joint arms to obtain terminal end location parameters of the joint arms, and the cantilever crane system terminal end location parameters can be accurately obtained. Engineering machinery and a cantilever crane system terminal end location parameter obtaining method are further provided.

A system and method for controlling drill string frictional forces during horizontal drilling are provided. The system includes a top drive having a motor that transmits a torque to a drill string to rotate the drill string, and an automated controller operably connected to the top drive to send at least one command signal to the top drive to initiate the rotation of the drill string. The controller monitors torque feedback signals, indicating that a torque limit on the drill string is exceeded, and / or a turn feedback signals indicating that the drill string is stalled to control the direction of the torque applied to the drill string when either the torque limit is exceeded or the drill string stalls.

The invention discloses a natural gas hydrate saturation and sediment permeability synchronous measurement device. The device comprises an inverted reaction kettle, wherein a vacuum pumping system, a confining pressure control system and a prepared sample circulation system are connected to the bottom end of the reaction kettle, a permeability transient measurement system, a hydrate saturation measurement system and a data collection system are connected to the top end of the reaction kettle and connected with a computer, and the reaction kettle, the prepared sample circulation system and the permeability transient measurement system are all arranged in a temperature control system. The invention also discloses a natural gas hydrate saturation and sediment permeability synchronous measurement method. Through the device and method, synchronous transient measurement of the hydrate saturation and sediment permeability in the synthesis and decomposition process can be realized, and a reliable experimental platform is provided for research on the change law of reservoir permeability in the hydrate reservoir-forming and exploiting process.

The invention discloses a shortcut method of nerve network decoupling based on the adaptive control multiple-variable system in the complex system intelligent modeling and decoupling control technique domain, which is characterized by the following: adapting on-line identification and decoupling of nerve network; guiding the other two-phase control signal into the input end of nerve network identifier as two signal reference and identification when certain one phase of the three-phase electrode system is on-line identifying; decoupling and controlling the three-phase electrode.

The invention provides a digital signal processor (DSP)-based intelligent gas sensor checking instrument for mines, comprising a microcontroller unit, a signal conditioning unit, a communication interface unit, a keyboard display unit, a touch control unit and a gas circuit system; and in the invention, the communication connection is carried out on the units and modules of the checking instrument. In the invention, the existing checking instrument structure is improved, and the central processing unit (CPU) technology, the electronic technology and the control technology are taken as main technologies, thereby solving the problems of low speed, low accuracy and high labor intensity of the existing checking instrument and providing services for underground safety production of coal mines.

The invention provides a precise propelling type electronic anesthesia machine which is characterized by being provided with an anesthetic propelling unit, a pressure and flow testing unit and a control unit. An anesthetic mixing unit is provided with a heating constant temperature unit. The anesthetic propelling unit is a precise injection unit and comprises an injection pump, a propelling controller and a stepping motor with a reduction gearbox. The pressure and flow testing unit comprises a pressure sensor and a flow sensor. The control unit comprises a signal processing module, a motion execution drive module and a single-chip microcomputer. The heating constant temperature unit is a PID intelligent temperature controller provided with a temperature sensor. According to the precise propelling type electronic anesthesia machine, anesthetic is directly injected into an anesthetic mixing and volatilizing cavity, heated in real time and controlled accurately, and therefore control of the vaporizing and volatilizing process of the anesthetic is economical, precise, accurate and stable. A volatilization core does not need to be adopted, requirements for the initial amount of the anesthetic can be avoided, the range of the applicable anesthetic is wide, generality is strong, a user can switch different kinds of the anesthetic conveniently, and convenience is brought to application in the animal experiment field.

The invention discloses a quenching and tempering device for cooling high-temperature fume, comprising a two-fluid electrical appliance controller, a water path and an air path arranged between a high-temperature fume inlet and a high-temperature fume outlet. The device of the invention is characterized in that a low pressure pump is arranged in the air path, a low pressure air path is combined into a water pipeline before a spray gun, two transducers are arranged to adjust the pressure and flow of a water pump and an air pump, the nozzle bore diameter is phi 6-7mm, and the spray particle diameter is smaller than 300 micrometers; a temperature sensor is respectively arranged at a wetting tower inlet and the fume outlet, and the outlet temperature is controller to 130-150 DEG C; an operation program is controlled to calculate the temperature difference of the fume inlet temperature and the fume outlet temperature, tower volume and spray fall height; two transducers are used for controlling the water pump and the air pump to automatically adjust operation power when low air pressure is 0.4-0.6MPa, and air flow quantity and water flow quantity are 5-25T / H. the particle diameter of sprayed water spray is small and even, which can better realize precise control to temperature and reduces atomization particle residence time and wet bottom danger. The dust removal device designed by the invention increases fume density and volume, lowers speed and improves dust removal function. In particular, the spray granularity is small, which can obviously control temperature and humidity, lower discharge Dioxin and furan mixed in dust and reduce environment protection cost.

A vehicle lane keeping control system calculates a feedforward control amount on the basis of a vehicle traveling path, calculates a first positional deviation amount between a vehicle and a target course at a first forward attention point when the vehicle travels in a straight line to the first forward attention point if a steering torque exceeds a threshold value, calculates a first lateral position feedback control amount, calculates an amount of deviation between an estimated vehicle traveling path and the target course at a second forward attention point remote from the first forward attention point if the first lateral position feedback control amount is lower than the threshold value, calculates a second lateral position feedback control amount, and calculates an electric motor current value by using at least the feedforward control amount and one of the first and second lateral position feedback amounts.

The invention discloses a feed crushing and classified collection device. A feeding mechanism comprises a feeding channel. One end of the feeding channel is connected with a feeding port, and the other end of the feeding channel is horizontally provided with a feeding baffle. One end of the feeding baffle is hinged to the side wall of a box body, and the other end of the feeding baffle is erected on a primary regulating wheel. A crushing mechanism comprises a crushing box. The crushing box is connected to the eccentric position of a rotary table through connection rods, the axis of the rotary table is rotationally connected to a support plate through a rotating shaft, a crushing drive motor drives a crushing frame inside the crushing box, and the bottom of the crushing box is provided with primary sieve holes. A sieving mechanism comprises a primary sieve net and a secondary sieve net which are horizontally arranged, one end of the primary sieve net is hinged to the side wall of a box body, the other end of the primary sieve net is arranged on a secondary regulating wheel, one end of the secondary sieve net is hinged to the side wall of the box body, the other end of the secondary sieve net is erected on a tertiary regulating wheel, a primary box door is arranged at the hinged position of the primary sieve net, a secondary box door is arranged at the hinged position of the secondary sieve net, the crushing effect is good, and the classification sieving function is achieved.

The invention provides a kind lf balance control way of open style industry recycling cooling water's weight concentration and pharmacy concentration .And weight concentration balance control way mainly controls the amount of water and salt of the industry recycling cooling water system ,according to the weight concentration N to control the add water and sewage water effectively to realize the balance control over the weight concentration of the industry recycling cooling water .And the pharmacy concentration balance control way is carried out on the basis of the weight concentration balance control way ,on the basis of weight concentration no change ,through adjusting and controlling the add water amount and dosing amount's proportion ,making the add dosage equal to the losing dosage in the same time of the system ,so realizing the pharmacy concentration keeping no change in the recycling water .The invention's advantages are saving water source ,keeping water quality stable ,etc.

A control system that constantly and accurately controls a control variable so that it remains within an allowable range is provided. The control system in accordance with the present invention estimates a steady-state deviation d in a controlled object as a steady-state deviation estimation value d′ on the basis of a control variable y and a final desired value y2. A control variable y in a controlled object based on the initial desired value y1 is estimated as the primary estimation value y1′ on the basis of at least the initial desired value y1 and the steady-state deviation estimation value d′. If a primary estimation value y1′ is within an allowable range, then a final desired value y2 agreeing with an initial desired value y1 is determined, while, if the primary estimation value y1′ is out of the allowable range, then the final desired value y2 is determined on the basis of at least a boundary value of the allowable range. A manipulation variable x is determined on the basis of the final desired value y2.

The invention discloses a method for setting the width of a ferrite stainless steel slab during continuous casting production. The method comprises the following steps of: according to the steel grades of ferrite stainless steel, calculating the shrinking percentage of a slab in the steel grade in the width direction when the temperature is reduced from the temperature at an outlet of a continuous casting machine crystallizer to room temperature; calculating a swelling value of the slab in the steel grade from creepage starting to creepage termination in the width direction; and according to the target width of the slab in the steel grade, adjusting the positions of copper plates on the two sides of the continuous casting machine crystallizer so as to set the width of the outlet of the crystallizer. The method accords with the performance characteristics of the ferrite steel grades. According to a control result, slabs meeting the preset product requirements can be produced and the requirements of a small error and a stable control law are met.

The invention discloses as-cast high pearlite quantity and high vermicular rate vermicular graphite cast iron and a preparation method thereof. The vermicular graphite cast iron is prepared from the following components by weight percent: 3.5-3.8% of C, 2.2-2.4% of Si, 0.8-1% of Mn, 0.2-0.4% of Cu, 0-0.4% of Mo, 0.08-0.1% of Sn, 0.2-0.4% of Cr, 0.2-0.5% of Ni, 0.05-0.1% of Nb, less than or equal to 0.06% of S, less than or equal to 0 .06% of P, and the balance of Fe and impurities introduced by raw materials. The vermicular graphite cast iron with a high creep rate (90-98%) is obtained by using an Mg-RE creeping method for controlling; furthermore, by means of micro-regulation of multiple alloy elements, the vermicular graphite cast iron with a high high pearlite quantity (90%-100%) can bestably obtained; the tensile strength of the vermicular graphite cast iron is greater than or equal to 500MPa, the elongation of the vermicular graphite cast iron is greater than or equal to 1.5%, Brinell hardness of the vermicular graphite cast iron is 230-260HBW, and the microhardness of pearlite is 300-320HV. The vermicular graphite cast iron provided by the invention has the characteristics of being good in mechanical properties, thermal fatigue resistance, thermal crack resistance and wear resistance under the extremely harsh working conditions; the preparation method is simple in control method and can stably produce castings with excellent comprehensive performance, thus being suitable for industrial mass production.

The invention relates to a garbage incinerator temperature fuzzy control method using case reasoning to extract rules, and relates to the technical field of urban solid garbage incinerator temperature control. The garbage incinerator temperature fuzzy control method using case reasoning to extract rules includes the following steps: 1) using a similarity assessment method to cluster the similar data for the incinerator temperature deviation and rate of change, and the historical data output from a controller; 2) according to the maximum membership rule, generating an initial rule base; 3) using the similarity assessment method to delete the redundancy rule so as to implement reduction of the rule base; 4) calculating the similarity between the target rule and each rule in the reduction rule base to retrieve the rules; 5) according to the nearest neighbor method, reusing the rules so as to form a fuzzy control rule base; and 6) realizing stable and accurate control of the incinerator temperature through a temperature controller.

The invention discloses a helicopter control load system based on an actual control lever system which mainly comprises a human-sensing loading device, a matching rod system and a control unit and control loading system software; the system can simulate the control load system in helicopter flight training, and satisfy the static and dynamic control characteristics of a helicopter under differentflight conditions and different control modes. The invention also discloses a simulation implementation method based on actual control lever system for a helicopter control load system. Firstly, according to the structure of an actual control system, the actual control lever system is equipped; a human-sensing loading equipment is installed at a corresponding position of the control load system, and connected into the matching rod system through a connecting rocker arm, and the human-sensing loading equipment adopts the actual assembled parts; the human-sensing loading equipment, a rudder control box and a control computer are connected through aviation cables; the control load system is controlled by the control software, and the control characteristics under various flight conditions arerealized.

The invention discloses a calcium treatment method in the vacuum process of an RH refining furnace. Through the vacuum cycle treatment process of the RH vacuum refining furnace, the RH alloy silo is used to add a calcium-containing alloy to the molten steel circulating in a vacuum chamber to modify molten steel inclusions and calcium treatment. The process is stable and controllable. After the treatment, the calcium composition of molten steel is controlled stably and accurately. The calcium recovery rate reaches more than 20%. The molten steel inclusions are fully denatured. The invention successfully solves the problem of secondary oxidation caused by the tumbling and exposure of molten steel when the pure calcium wire is fed after the vacuum treatment of the RH refining furnace, stabilizes the calcium treatment effect, reduces the content of inclusions, improves the cleanliness of the molten steel and passes the flaw detection of the finished steel plate The production rate is reduced, and the economic benefit is greatly improved.

The invention provides an air conditioner and a marine air-conditioning system. According to the air conditioner, a box body is provided with a fresh return air mixing cavity and a fresh inlet air cavity and is also provided with a fresh air inlet communicated with the fresh inlet air cavity and a return air inlet communicated with the fresh return air mixing cavity, and the fresh inlet air cavityis communicated with the fresh return air mixing cavity. A fresh air fan is arranged in the fresh inlet air cavity. A fresh inlet air regulating valve is arranged at the fresh air inlet and controlsfresh inlet air amount. A return inlet air regulating valve is arranged at the return air inlet and controls return inlet air amount. A detection control portion comprises an air amount detecting assembly and a control assembly, wherein the air amount detecting assembly is arranged in the fresh inlet air cavity and detects the fresh air inlet amount of the fresh inlet air cavity, the control assembly is connected with the fresh inlet air regulating valve, the return inlet air regulating valve and the air amount detecting assembly, and the opening degrees of the fresh inlet air regulating valveand the return inlet air regulating valve are controlled according to the fresh inlet air amount detected by the air amount detecting assembly. The air conditioner is more accurate in fresh inlet airamount control.

The invention discloses a cyclic aeration subsurface oxygen irrigation system. The system comprises a main water delivery pipe (6), wherein, one end of the main water delivery pipe (6) is communicated with a water source, the main water delivery pipe (6) is communicated with an aeration water storage tank (1) provided with an exhaust valve (2) in parallel through a first three-way joint (7) and a second three-way joint (8), and the other end of the main water delivery pipe (6) is communicated with each water irrigation tubular billet (5) buried in soil. The cyclic aeration subsurface oxygen irrigation system is characterized in that the exterior of the aeration water storage tank (1) is connected with a venturi ejector (3) and a booster pump (4); a first water flow control valve (9) is arranged between the aeration water storage tank (1) and the three-way joint (7); a second water flow control valve (10) is arranged between the aeration water storage tank (1) and the three-way joint (8); and a third water flow control valve (11) is arranged between the three-way joint (7) and the three-way joint (8). The cyclic aeration subsurface oxygen irrigation system disclosed by the invention has the advantages of simple structure, low cost, less energy loss, cyclic aeration function and wide range of aeration ratio, and is convenient for use and management as well as maintenance and is labour-saving; and meanwhile fertilizer can be dissolved in water, and fertilizer, water and gas can be irrigated at the same time, thus utilization ratio of fertilizer can be improved, and pollution to soil and underground water can be reduced.

The invention belongs to the field of machine design and manufacturing-high grade numerical control machine tool and basic manufacturing equipment, and relates to large-scale seven-shaft linkage numerical control laying and winding integrated forming equipment. A main machine which is formed by three linear shafts and one rotating working table rotating shaft, and a laying and winding head which is driven by three rotating shafts are adopted to composite three translation movement and four rotation movement to achieve laying and winding head spatial motion track control and workpiece rotation.A conveying belt u shaft is adopted to drive winding and rewinding of a cloth belt and speed adjustment to achieve eight-shaft control seven-shaft linkage laying, and therefore automatic forming of acomposite material skin structure with all kinds of spacial special-shaped hook surfaces is achieved. The spatial motion track of the laying winding head can be directly controlled, even a workpiecewith the special-shaped hook surface can be accurately attached to the surface of the laying winding head for laying and winding, and therefore forming operation of material cutting after solidifyingand forming can be reduced and even avoided. Pollution is reduced, the cost is saved, and efficiency is improved. The automatic tow placing technology provides an equipment platform suitable for engineering application research and manufacture.

The invention discloses a zebrafish embryo heart injecting system and method based on vision servo three-dimensional rotation, and relates to the field of micro-injection. The zebrafish embryo heart injecting system comprises a stereomicroscope, a CCD camera, a supervisory computer, a triaxial mechanical hand, a rotating manipulator, a micropipet and a pump, wherein the CCD camera is located abovethe stereomicroscope, and is used for collecting images and transmitting the collected images to the supervisory computer for treatment; the supervisory computer is connected with the triaxial mechanical hand and the rotating manipulator, and is used for analyzing the real-time position and the gesture of a zebrafish embryo as well as the point position of the micropipet according to the collected images, and transmitting a control signal to the triaxial mechanical hand and the rotating manipulator to control the direction and the speed of the triaxial mechanical hand and the rotating angle of the rotating manipulator; the triaxial mechanical hand is used for clamping the corresponding micropipet to move the point of the corresponding micropipet to a target position; the rotating manipulator is used for clamping the corresponding micropipet to rotate the zebrafish embryo; and the pump is used for providing sucking force for sucking and holding the zebrafish embryo and thrust for pushing out foreign substances. The system is simple in structure, high in precision and good in stability.