35results about How to "Offset adverse effects" patented technology

The invention discloses a motor servo system additivity fault detection and fault tolerant control method based on a slip form. The method includes building a motor servo system mathematical model containing additivity fault description, designing a slip form disturbance observer to observe additivity fault level and demonstrate observation accuracy, designing an initiative fault tolerant controller according to the observed additivity fault, and demonstrating system overall gradual stability according to the Lyapunov nonlinear stability principle. By means of the control method, the reasonable fault tolerance degree can be set to ensure that effects caused by various model uncertainties are kept in the designed fault tolerance range all the time when the system has no fault, false alarming of the system is avoided, and fault detection robustness is improved. The additivity fault level of the system can be observed on line, real-time performance of additivity fault detection is guaranteed while system control performance is not affected, active detection missing and fault tolerant control of minor faults can be achieved, and timely warning of severe faults is also achieved.

The present invention relates to the electric energy transformation technology field, in particular to a voltage drop detection method suitable for a power grid voltage large harmonic content. The method comprises the steps of real-timely detecting a power grid voltage, calculating a positive sequence module value eP and a negative sequence module value eN of the power grid voltage, and carrying out the steady state judgment according to a calculation result; real-timely detecting the power grid voltage, calculating the voltage components e alpha and e beta of the power grid voltage in an alpha-beta stationary reference frame, carrying out the instant judgment according to the calculation result. When the instant judgment is used to limit an instant overcurrent, and the steady state judgment is used to determine a reactive current, the instant judgment pays attention to the rapidity, and the steady state judgment pays attention to the stability and accuracy. The two methods are combined to use, and make up the insufficiency mutually, thereby guaranteeing the accuracy and the stability of a judgment result.

The invention relates to a motor driving system, in particular to a sine-wave current driving system of a single-winding brushless direct current motor and a control method thereof. The driving system and the control method calculate an input current phase angle instantaneous value and an input current instruction value according to the motor rotation frequency acquired by a position sensor, further sequentially obtain a circuit control voltage item, an instantaneous sensing voltage value and an output voltage instruction value, finally obtain the output duty ratio alpha so as to generate a PWM wave signal, transmits the signal to a full-bridge power inverter circuit so as to control a high-power switch device and accordingly achieves driving control of the single-winding brushless direct current motor. The driving control of the single-winding brushless direct current motor is performed by adopting the driving system and the control method, the motor is easy to start, the manufacture cost is low, vibration and noise are small during motor running, and an application range is wide.

The invention relates to a solar constant temperature fermentation biogas tank which pertains to the field of biochemistry, can eliminate the effect of natural environment on fermentation temperature and overcomes the disadvantages that the current biogas fermentation tank is unstable in output and even cannot produce gas in cold areas. The made improvement is that the wall or the wall and the bottom of the fermentation tank are two-layered and an interlayer for circulating water is formed between the two layers. A solar water heater is added. The interlayer connecting the solar water heater and the fermentation tank forms a water circulation circuit. A water pipe is provided with a pump. A biogas burner is arranged at the back of the absorber plate of the solar water heater. The pump and the biogas burner are controlled by a temperature sensor and a temperature signal processing circuit which are positioned in the fermentation tank and the water heater. The fermentation biogas tank of the invention has the advantages of utilizing the solar water heater and circulating water in the interlayer under particular cases, in which the fermentation tank is the biogas tank to heat and preserve heat, to realize the fermentation of the fermentation biogas tank under the optimum temperature condition, thus offsetting the unfavorable effects of the change of natural temperature on the fermentation and obtaining the effect of stable and high efficient biogas production in cold areas where temperature changes greatly.

The invention discloses an intelligent primary air pressure target value control system and method. The system comprises a first control logic module, a second logic control module, a controller, a summator, and a collecting module for collecting AGC instructions sent out by an electric energy management system. The output end of the collecting module is connected with the input end of the second logic control module. The output end of the second logic control module is connected with the output end of the first control logic module and the input end of the summator. The output end of the summator is connected with the input end of the controller. The output end of the controller is connected with the control end of a hot air baffle in a primary air duct. By means of the system and method, primary air power consumption can be effectively lowered.

According to the bulk acoustic wave filter capable of improving near-stop band suppression and the electronic equipment. Sealing rings are connected to the reference ground plane of the carrier platethrough the solder balls, so that coupling between the resonators and coupling between the resonators and the sealing rings are eliminated, and near-stop band suppression is further improved. The bulkacoustic wave filter comprises a chip main body, a protective cap and a carrier plate, wherein a plurality of resonators are sequentially arranged on the surface layer of the chip main body, and a sealing ring is arranged at the periphery of the plurality of resonators; the protective cap is arranged on the chip main body, the two sides of the sealing ring are respectively connected with a metalcolumn, the bottom ends of the two metal columns are respectively connected with the sealing ring, the top ends of the two metal columns penetrate through the surface layer of the protective cap to beconnected with a metal strip, and the metal strip is connected with the carrier plate through metal balls.

The invention relates to a neural network pulse synchronization method and system containing clustering topology coupling. The method comprises the steps that an isolated neural network model with random disturbance and a derivative coupling neural network model with multiple clusters are established; establishing an error network model according to the isolated neural network model and the derivative coupling neural network model, and designing a pulse containment controller according to a topological structure of the error neural network model and the pulse signal; selecting a correspondingfunction according to the error network model, and realizing clustering synchronization between a derivative coupling neural network model and an isolated neural network model in combination with thepulse containment controller; and establishing a neural network model and performing numerical simulation by using the neural network model to verify a clustering synchronization effect between the derivative coupling neural network model and the isolated neural network model. The method is low in cost and is beneficial to accurately controlling the synchronization rate.

A combination of a muscarinic cholinergic receptor agonist, a non-anticholinergic antiemetic agent and a non-selective, peripheral anticholinergic agent for the treatment of hypocholinergic disorders of the central nervous system.

The invention relates to a non-split complete matching layer absorption boundary method, a lower medium is semi-infinite, and a calculation space is limited such that an absorption boundary needs to be introduced when seismic wave propagation is simulated. The absorption boundary does not truly exist in an underground medium, reflection is not formed when actual seismic waves are transmitted to the absorption boundary, and certain false reflection can be brought by artificial boundaries. By adopting a residual error complete matching layer provided by the invention, incident waves can be effectively absorbed, and seismic waves are prevented from being transmitted back to a main area. According to the method, the form of an original equation is not changed, programming implementation is facilitated, and the method can be popularized to more complex medium simulation; an auxiliary equation eliminates a time partial derivative term of an original variable, and the popularization to high-precision forward modeling is more facilitated. Meanwhile, complex frequency shift transformation is successfully realized on the basis of the residual error complete matching layer such that grazing-in waves can be absorbed, and the generation of low-frequency singular values is avoided; and a complete matching layer structure with double attenuation sections is adopted such that the stability isimproved.

The invention discloses a preparation method of a waterborne peelable coating. The preparation method comprises the following procedures: (1) preparing an epoxy resin-butanone solution; (2) adding isophorone diisocyanate and the like into a first reaction kettle at the room temperature, so as to obtain a primary product; (3) adding dimethylolpropionic acid and the like into the primary product, so as to obtain an epoxy-modified polyurethane emulsion; (4) adding silica sol and the epoxy-modified polyurethane emulsion into a third reaction kettle, so as to obtain a mixed emulsion; (5) adding a proper amount of acrylic copolymer sylvite and the like into a fourth reaction kettle, so as to obtain a mixed base solution; (6) adding the mixed emulsion into the mixed base solution, so as to obtain the waterborne peelable coating; (7) carrying out wiping and air-drying on a plastic film, and diluting the waterborne peelable coating; (8) spraying waterborne peelable coating to the plastic film, and airing, so as to obtain a waterborne peelable coating paint film. The paint film prepared by virtue of the preparation method can be used for conveniently testing the properties such as tensile property, corrosion resistance, vapor permeability and peel strength of the coating.

The invention discloses a method for preparing a water-based aliphatic polyurethane emulsion type strippable coating. The method comprises the following procedures: (1) adding isophorone diisocyanate and the like into a first reaction kettle at room temperature to obtain a primary product; (2) adding dimethylolpropionic acid and the like into the primary product to prepare acrylate modified aliphatic polyurethane emulsion; (3) adding silica sol and the acrylate modified aliphatic polyurethane emulsion into a third reaction kettle at room temperature to obtain mixed emulsion; (4) adding a proper amount of an acrylate copolymer potassium salt and the like into a fourth reaction kettle in which distilled water is contained to obtain a mixed base solution; (5) adding the mixed emulsion into the mixed base solution to obtain the water-based aliphatic polyurethane emulsion type strippable coating. By the prepared coating, a protected object can be effectively sealed and protected, and can be prevented from being polluted, corroded and damaged. In addition, the coating is also high in water resistance and strippability and stronger in cohesive force and coating film strength.

The invention discloses a constant tension control device and a control method. The constant tension control device comprises a first guide wheel, a floating pulley assembly, a second guide wheel, a measuring and monitoring mechanism, a guide wheel mounting plate, a third guide wheel, a bottom plate, a driving mechanism and an encoder; one end of a base material is attached to a winding roller ina winding manner, and the other end of the base material sequentially penetrates through the third guide wheel, the measuring and monitoring mechanism, the second guide wheel, the floating pulley assembly and the first guide wheel from the winding roller; and the driving mechanism is used for driving the winding roller to rotate according to a tension value, displayed by the measuring and monitoring mechanism, of the base material, so that winding or unwinding of the base material is achieved, and the tension of the base material is kept constant. According to the constant tension control device, a motor-driven magnetic powder clutch is used as an actuating mechanism, and the floating pulley assembly is used for passive adjustment, so that the tension of a controlled target is well controlled; and the tension of the controlled target is accurately controlled by adopting a method of combining feedforward control and feedback control, so that the control precision is improved.

The invention relates to a halogen-free flame-retardant PA6 composite material which comprises the following components in percentage by mass: 66%-90% of a PA6 base material, 9%-25% of a compound halogen-free flame retardant, 0.1%-2.0% of a main antioxidant, 0.2%-4.0% of an auxiliary antioxidant and 0.7%-3.0% of a lubricant, wherein the compound halogen-free flame retardant is prepared from a hypophosphite-cyclotetrasiloxane double-base synergistic compound and a nitrogen flame retardant together. Hypophosphite-cyclotetrasiloxane double groups are used for cooperation, the flame retardant hasextremely good charring performance and an excellent flame retardant effect, the addition amount of the halogen-free flame retardant can be greatly reduced, the compatibility problem of the flame retardant and a matrix is improved, and the mechanical property of the matrix can be enhanced due to the existence of a Si crosslinking structure contained in a siloxane group so that adverse effects caused by the addition of the flame retardant are further counteracted; the halogen-free flame-retardant PA6 composite material has the advantages of high flame-retardant efficiency, no halogen, low smoke, low toxicity, dripping resistance and excellent processability and is widely applicable.

The invention discloses a heavy metal removing device for a seedling growing pool, the heavy metal removing device is provided with a rectifying casing with a hollow inner cavity, and the rectifying casing inner cavity is provided with a spiral exchange group capable of absorbing heavy metal ions; the upper part of the rectifying casing is provided with a water outlet; the center of the lower part of the rectifying casing is provided with a water inlet, and flow mixing holes go through the periphery of the water inlet in a uniform distribution; an annular air stone is hung at the lower side of the rectifying casing. During inflation and oxygenation of the annular air stone, water is driven to form a rising flow, which flows by the spiral exchange group from the water inlet, and flows out from the water outlet. In the process, the water flow flows by the spiral exchange group, and the heavy metal ions in the water are absorbed by the spiral exchange group, reaching effect of removing the heavy metal ions. The heavy metal removing device in the invention is advantaged by firm structure, high safety, wide application scope, high absorption efficiency of ions, and small harm upon fry.

The invention relates to a method and a system for monitoring and evaluating the mechanical state of an intelligent high-voltage switching device. The system comprises a monitoring host which is communication connection with a corresponding sensor of each kinematic pair on a kinematic chain. The monitoring host is used for monitoring kinematic parameters of at least two kinematic pairs on the kinematic chain, and recording the kinematic parameters in real time. The transmission performance of the kinematic chain is evaluated according to the transmission relationship among the kinematic pairs by comparing and judging the recorded information of the kinematic pairs. According to the method for monitoring and evaluating the mechanical state of an intelligent high-voltage switching device of the invention, the kinematic performance of a whole kinematic chain is comprehensively analyzed and judged according to the transmission relationship among a plurality of kinematic pairs selected from the kinematic chain instead of being represented with data of a single kinematic pair.

The invention discloses a preparation method of an acrylate modified polyurethane protecting packaging film composition. The preparation method comprises the following procedures: (1) adding toluene diisocynate and the like into a first reaction kettle at the room temperature, so as to obtain a primary product; (2) adding dimethylolpropionic acid and the like into the primary product, so as to obtain an acrylate modified aromatic waterborne polyurethane emulsion; (3) adding silica sol and the acrylate modified aromatic waterborne polyurethane emulsion into a third reaction kettle at the room temperature, so as to obtain a mixed emulsion; (4) adding a proper amount of acrylic copolymer sylvite and the like into a fourth reaction kettle containing distilled water, so as to obtain a mixed base solution; and (5) adding the mixed emulsion into the mixed base solution, so as to obtain the acrylate modified polyurethane protecting packaging film composition. By utilizing the packaging film composition prepared by virtue of the preparation method, a to-be-protected object can be effectively closed and protected, and the pollution, corrosion and damage of the object are prevented. The packaging film composition further has excellent water tolerance, relatively high stability, relatively strong cohesion, good peelable property and relatively high paint film strength.

The invention discloses a preparation method of a high-coating-strength packaging body composition. The method comprises the following processes: (1) preparing an epoxy resin-butanone solution; dewatering and drying raw materials; (2) adding toluene diisocynate and the like into a first reaction kettle to obtain a primary product; (3) adding dimethylolpropionic acid into the primary product, and then adding triethylamine to prepare epoxy-modified aromatic polyurethane emulsion; (4) adding silica sol and the epoxy-modified aromatic polyurethane emulsion into a third reaction kettle at the room temperature to obtain mixed emulsion for later use; (5) adding right amount of acrylic copolymer potassium salt and the like into a fourth reaction kettle filled with distilled water to obtain a mixed base solution; (6) adding the mixed emulsion into the mixed base solution to obtain the high-coating-strength packaging body composition. The high-coating-strength packaging body composition prepared by the method has higher safety, excellent water resistance, higher stability, stronger cohesion, good strippable property and higher coating strength.