74results about How to "Guaranteed frequency" patented technology

The invention relates to a real-time dynamic 3D water balance monitoring system of a power plant and a working method of the system. The system is characterized by comprising a data collection module, a data transmission module, a data storage module, a monitoring center and a data analysis and application module, wherein the data collection module collects flow data, and the data transmission module returns data collected by the data collection module in real time. Water volume data of different collection points is collected by the data collection module, transmitted to the data storage module by the data transmission module, and further transmitted to the data analysis and application module by the data storage module. The system and method have the advantages that the relation between water volume change and generating load is found via data analysis, the imbalance rate is calculated, and thus, scientific basis is provided for planning water-saving measures of the power plant.

The invention discloses a microgrid robust optimization scheduling method in consideration of component frequency characteristics. In consideration of the uncertain fluctuation characteristics of windpower and photovoltaic power output, a microgrid robust optimization scheduling module in consideration of the frequency response characteristics of various components is established. The robust optimization scheduling module is solved by using a Benders decomposition method. An original problem is decomposed into a sub problem and a main problem to be alternately iterated to obtain a robust optimization scheduling scheme. The objective function of the robust optimization model achieves minimum total operating cost of the microgrid under an extreme scenario with maximum network loss. The constraints include active balance constraint, diesel set operating characteristics, energy storage device operating characteristics, line frequency characteristics, load frequency characteristics, voltage safety constraint, and frequency security constraints. The obtained scheduling scheme can ensure that the system cannot exceed a frequency limit within the uncertain fluctuation range of distributedwind power and photovoltaic power output, and ensure the frequency safety of the microgrid.

The invention discloses a micro-grid combination control method based on an inverter in an energy storage unit. The control method is characterized in that inverter power supplies (of a micro-grid) which operate in a parallel manner before the micro-grid combination all adopt droop control policies; the inverter power supplies adopting the droop control policies adopt an operation mode of peer-to-peer control; a static switch which is used as a grid combination switch-on switch is adopted between the micro-grid and a power frequency power grid; the micro-grid combination control method comprises the following steps of: measuring and calculating a voltage amplitude value difference and a frequency difference at two sides of a public coupling point of the micro-grid and the power frequency power grid; adding the energy storage unit for adjusting so as to enable the voltage phase angle difference to meet voltage phase angle constraint conditions; closing a grid combination switch when all constraint conditions are met; and switching over inverter control policies of the energy storage unit to accomplish the whole process of the grid combination after the switch is closed. According to the method, the impact caused by the grid combination is reduced, and the micro-grid is smoothly combined into the power frequency power grid.

The present invention discloses a GPS wireless positional method and system. Said method mainly includes: control center transmitting GPS dynamic positioning beginning request to GPS positioning terminal, GPS positioning terminal regulating frequency of reporting GPS positioning information to control center, transmitting GPS positioning information to control center; said system including control center, wireless mobile communication network, GPS positioning terminal, GPS satellite; said control center transmitting dynamical wireless positioning request to said GPS positioning terminal, said GPS positioning terminal regulating reporting GPS positioning information frequency to said control center, and transmitting GPS positioning information to control center. The present invention method and system make a reasonable balance between GPS wireless application system wireless data communication quantity and GPS positioning information real time.

The invention relates to a tennis training machine and a training method of the tennis training machine. The tennis training machine comprises a ball picking system, a turning system, a ball hitting system and a ball collecting system, wherein the ball picking system, the turning system, the ball hitting system and the ball collecting system are used in cooperation. The turning system comprises an irregular cam rotating shaft, the ball hitting system comprises an incomplete gear, the ball collecting system comprises a ball conveying device, the irregular cam rotating shaft is connected with a main shaft of the motor, the incomplete gear is connected with the main shaft of the motor through a belt, and the ball conveying device is connected with the main shaft of the motor. The tennis training machine is simple in structure, a shoot cylinder can randomly rotate in an irregular mode, the frequency and the speed of throwing tennis balls are ensured, the tennis balls on the ground can be automatically collected when the tennis training machine is pushed, the tennis training machine has high training simulation performance, and the training effect can be better.

The invention is concerned with stabilized frequency method and equipment of double longitudinal modes laser based on thermoelectric cooler. The stabilized frequency method is piezoelectric ceramics, and so on. Detect the circumstance temperature T0 of laser to confirm heat balance temperature Tset, start electrical source of laser to test current temperature Treal of laser tube at real time. Adjust countercurrent I according to different value between current temperature Treal and heat balance temperature Tset and heat up laser tube to keep temperature arrive to Tset. Detect optical power Pm and Pm+1of m order and m+1order on the mutual vertical polarization direction to laser and count the different valueDeltP of the two powers. When the temperature of laser tube is near to heat balance temperature Tset, afford forward or counter current to thermoelectric cooler according to the forward or counter to the different valueDeltP, keep the symmetry of two longitudinal mode laser frequency and make the different valueDeltP close to zero, by controlling the temperature of laser tube, the length of resonant cavity and laser longitudinal mode frequency. The two longitudinal mode frequencies are steady, and this product is fit for stabilized frequency.

The invention relates to a method for adjusting output power of a synchronous generator. The method is implemented by the utilization of properties as follows: magnitude of excitation magnetic field during operation of the synchronous generator is unrelated to input power of the generator; magnitude of input power is proportional to magnitude of a load connected to an induction coil, current intensity and number of turns of the induction coil; and when rotor speed of the synchronous generator is unchanged, magnitude of excitation magnetic field is proportional to magnitude of output voltage and is proportional to number of turns of an armature coil. During design, excitation flux of a rotor is designed to be higher, and the maximum value is unchanged during operation of the generator. Then, a stator coil is designed to be a structural form capable of adjusting the number of turns. During operation of the generator, it is ensured that output voltage and frequency of the generator are rated values by adjusting or selecting the number of turns of the corresponding stator coil and the magnitude of input power according to the condition of the load. In addition, the method used in a permanent magnet synchronous generator has a more obvious energy-saving effect.

The invention discloses a satellite user side beam design method applied to a satellite mobile communication system, and the method comprises the following steps: 1, arranging at least one service beam and at least one signaling beam on a satellite user side, and in an idle state, enabling a user to reside in the signaling beam and receive system broadcast and monitoring paging at the signaling beam; after the user enters the connection state, switching to a service beam, and realizing transmission of service data by the service beam; 2, dividing a service area of the satellite into M service wave positions and N signaling wave positions, wherein M>=N, and the value of M is based on the signal-to-noise ratio of a satellite user side link to ensure that the service transmission rate of the connected state user meets the requirement; and the value of N is determined according to the overhead time of the satellite service area, so that the beam switching and reselection of the user are not too frequent. According to the invention, the resource utilization rate of the system can be improved, the service transmission rate is improved, the full coverage of the satellite service area is realized, and the beam switching and reselection times are reduced.

The invention discloses a low-temperature microwave source, a low-temperature microwave source chip and a manufacture method thereof. The chip comprises a substrate, a transmission cavity, a bias junction, a voltage bias line and a direct current bias line, wherein the transmission cavity, the bias junction, the voltage bias line and the direct current bias line are located on the surface of the substrate. The transmission cavity comprises a SQUID chain and is used for emitting microwave photons. The bias junction is electrically connected with the transmission cavity and is used for generating microwave photons. The voltage bias line is used for applying bias voltage to the bias junction, so that electronic cooper pairs in the bias junction are transformed into microwave photons through stimulated emission. The direct current bias line is used for applying a magnetic field to the transmission cavity. The resonant frequency of the transmission cavity is determined by the total capacitance and total inductance of the SQUID chain. The total inductance of the SQUID chain varies with the size of the magnetic field. The size of the magnetic field varies with the magnitude of the current in the direct current bias line. According to the invention, the low-temperature microwave source chip generates microwave photons through stimulated emission; the stability of the frequency, the amplitude and the phase of emitted microwave photons is ensured; and microwave source requirements are met.

The invention discloses an electric power system secondary frequency modulation method based on DFIG and a synchronous generator. According to a synchronous generator frequency deviation, a connectingline net exchange power and a wind power predication error, an ACE value of a power grid is calculated, and furthermore the active power adjustment amount of each modulated frequency is distributed according to a wind power field and synchronous generator secondary frequency modulation adjustment participation coefficient, thereby realizing coordinated secondary frequency modulation control between DFIG and the synchronous generator. According to the electric power system secondary frequency modulation method, based on traditional power grid AGC controlling, influence of the wind power predication error to the magnitude of ACE is considered, and active standby of the wind power field is taken into the power grid secondary frequency modulation. Based on the traditional secondary frequencymodulation, a secondary frequency modulation adjustment coefficient of the wind power field is defined so that coordinated secondary frequency modulation control of the DFIG and the synchronous generator is realized.

The invention discloses a control method of a new energy power system in a multi-source multi-regulation-domain operation mode, which belongs to the field of active scheduling control of electrical engineering. The multi-source multi-domain control method is adopted, and closed-loop feedback is introduced, the generator set is controlled to track the load increment in real time so as to ensure that the frequency is at a required level. The load component with the adjustable load (changing period between 10 seconds to several minutes) can be tracked, and the correlation coefficient of the adjustable load and the generator set can be defined, so that the load weight can be effectively controlled. The electric load and the stabilizing capacity of the power generation system can be balanced, and safe and stable operation of the power grid can be realized.

The invention discloses a combined installation system for accelerometer and total station measurement. The combined installation system comprises a basic disc assembly, a base plate assembly, a spirit level, a compass, a prism and a transparent protection cover, wherein the spirit level, the compass, the prism and the transparent protection cover are mounted on the basic disc assembly; the base plate assembly is fixed on a to-be-monitored part; the basic disc assembly is mounted on the base plate assembly and can rotate; the transparent protection cover is fixed on the basic disc assembly; the spirit level, the compass, the prism and a three-dimensional accelerometer are all mounted in the transparent protection cover; the prism is aligned with a total station. The combined installation system has the advantages of simple and compact structure, low cost and the like, and is very convenient to mount and operate.

The invention relates to a high-power multi-core optical fiber laser device. The high-power multi-core optical fiber laser device is composed of a seed resource, a pattern matcher, an amplifier and an optical fiber transmission system. The seed resource is composed of (N+1)*1 couplers, doping optical fibers and two fiber bragging gratings. The output ends of the (N+1)*1 couplers are sequentially connected with one fiber bragging grating, the doping optical fibers and the other fiber bragging grating. The pattern matcher is composed of output optical fibers and multi-core optical fibers of the seed resource and the amplifier is composed of the multi-core (N+1)*1 couplers and the multi-core doping optical fibers. The multi-core optical fibers of the pattern-type matcher are connected with the input ends of the multi-core (N+1)*1 couplers and the output ends of the multi-core (N+1)*1 couplers are connected with the multi-core doping optical fibers. Flattening or tapering flattening is conducted on the output ends of the multi-core doping optical fibers, so that the output ends of the multi-core doping optical fibers are connected with an end cap in a fused mode to form the optical fiber transmission system to output lasers. The high-power multi-core optical fiber laser device can effectively avoid the non-linear phenomenon, enables ultra-high power laser output to be achieved and has the advantages of being compact in structure, high in photoelectric conversion efficiency, stable, reliable and good in laser beam quality.

The invention provides a content recommendation method and device. The method comprises the steps that content classification recommendation information generated according to a user search behavior is received; the content classification recommendation information comprises at least one content classification; and the content classifications are subscribed for a current user. According to the method, by subscribing the content classifications recommended according to the user search behavior, a product can recommend information content, optimally recommended according to the user search behavior, to the user in a subscription page actively and continuously, recommendation frequency is guaranteed while recommendation accuracy is improved, and therefore the information distribution amount of the product is substantially increased.

The invention provides laser tin soldering equipment for welding a mobile phone camera. The equipment comprises a laser generator, a beam expander, a diaphragm, a laser galvanometer, an F-Theta field lens, and a PWM modulating circuit connected with the laser generator. The invention further provides a method for welding the mobile phone camera by using the laser tin soldering equipment; the method comprises the following steps: (1) the laser tin soldering equipment moves to enable the F-Theta field lens to be aligned to a processing platform; and (2) the laser generator emits a pulse laser; the PWM modulating circuit adjusts the duty ratio of the laser pulse; one tin soldering process consists of multiple time periods connected in sequence; the duty ratio of the laser pulse in each time period is kept invariable; and the duty ratios of the laser pulse corresponding to the multiple time periods are gradually increased from the first time period to the last time period. The equipment and the method are low in cost, and can effectively prevent solder paste from splashing in the tin soldering.

The present invention discloses an information processing method and an electronic device. The method comprises the steps of acquiring first information, wherein the first information comprises running parameters of a first electronic device; determining, based on the first information, the running state of the first electronic device; processing, based on an eavesdrop interval time adjustment policy corresponding to the determined running state, a first eavesdrop interval time, so as to obtain second eavesdrop interval time; and after each second eavesdrop interval time is up, acquiring first data from a second electronic device through a data channel in the running state in which the first electronic device is. According to the method, while the requirement of real-time data transmission of the electronic device is met, the power of the electronic device is saved, and the endurance performance of the electronic device is ensured.

The invention discloses an economical and practical embedded freezing and cold storage fresh-keeping and preservation low-intensity magnetic field modularization device which can be applied to refrigerators, intelligent cabinets, wine cabinets, warehouse logistics equipment and the like. The device comprises a coil frame, a magnet exciting coil and a control circuit, the magnet exciting coil is arranged in the coil frame so as to generate a steady low-intensity magnetic field or a pulse steady low-intensity magnetic field; and the control circuit is connected with the magnet exciting coil and used for adjusting the magnetic field intensity of the steady low-intensity magnetic field or the pulse steady low-intensity magnetic field and the magnetic field frequency and the duty ratio of the pulse steady low-intensity magnetic field. According to the device, a small-size coil frame and a small-size wire diameter are adopted, so that the ratio range of the weight of the device to the effective storage volume of embedded equipment is 0.05-0.5 kg / L, the unit volume energy consumption of the embedded equipment is 0.03-5.0 W / L, important factors such as weight, magnetic field intensity and frequency, coil heat dissipation, magnetic field duty ratio and the like are balanced, high-quality and low-energy-consumption freezing and refrigeration of food, medical supplies, agricultural product raw materials, fresh flowers, plant seeds and the like by the magnetic field are kept to the maximum extent.

The invention provides a vehicle braking method and device based on vehicle weight and gradient self-adaption and a medium. The method comprises the following steps: determining a first forgetting factor corresponding to vehicle weight data and a second forgetting factor corresponding to road slope data; obtaining a forgetting vector; based on the forgetting vector and a preset recursive least square method with a forgetting factor, constructing a corresponding vehicle weight and road slope estimation model; obtaining vehicle weight estimation data and road slope estimation data at the current moment according to the driving state parameters and the vehicle performance parameters of the vehicle at the current moment and the vehicle weight and road slope estimation model; and according to the vehicle weight estimation data and the road slope estimation data at the current moment, determining the brake pedal force and the brake safety distance of the vehicle at the current moment, and conducting vehicle braking based on the brake pedal force and the brake safety distance. Therefore, an emergency braking system can carry out self-adaptive control on the braking safety distance and the braking pedal force according to the vehicle center and slope conditions.

The invention relates to rapid hydrogen charging complete equipment based on a gas driving and pressure enhancing technology. The equipment comprises a pregaining hydrogen storage tank, a gas driving and pressure enhancing pump, a detected hydrogen storage tank, a first pressure sensor, a PLC controller, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve,a fourth electromagnetic valve, a first gas control valve controlled by the first electromagnetic valve, a second gas control valve controlled by the second electromagnetic valve, a third gas controlvalve controlled by the third electromagnetic valve, a fourth gas control valve controlled by the fourth electromagnetic valve and a fifth electromagnetic valve. A gas inlet of the gas driving and pressure enhancing pump is connected with corresponding gas outlet pipelines of the detected hydrogen storage tank and the pregaining hydrogen storage tank. A gas outlet of the gas driving and pressure enhancing pump is connected with corresponding gas inlet pipelines of the detected hydrogen storage tank and the pregaining hydrogen storage tank. The first pressure sensor detects the pressure of thedetected hydrogen storage tank, and outputs the pressure signal to the PLC controller, the PLC controller controls opening and closing of the gas driving and pressure enhancing pump through the fifthelectromagnetic valve, and controls the first gas control valve, the second gas control valve, the third gas control valve and the fourth gas control valve through the corresponding first electromagnetic valve, the corresponding second electromagnetic valve, the corresponding third electromagnetic valve and the corresponding fourth electromagnetic valve to open or close the gas path. According tothe present invention, the sufficient and real hydrogen storage and rapid hydrogen charging and discharging tests are provided for the high-pressure hydrogen storage tank provided by the present invention to obtain the leakage prevention ability of the high-pressure hydrogen storage tank during bearing repeatedly hydrogen charging and discharging, the equipment provided by the present invention has advantages of rapid speed of the hydrogen charging and discharging, high performance and reliability.

The invention discloses an experimental device and an experimental method for simulating the wave disturbance of a lake, belonging to the field of water environment experiment. In order to solve the problem that the experimental device in the prior art has the disadvantages of non-uniform environment, complex assembly and complicated operation, the invention provides an experimental device and an experimental method for simulating the wave disturbance of a lake. The experimental device comprises an experimental table base. The periphery of the experimental table base is equipped with a support. The support is arranged around and above the experimental table base. A sample culture pool is arranged on the experimental table base. A disturbance device is arranged on the support, and passes through the support into the sample culture pool. Motors rotate circularly to make support rods do up-down linear periodic motion. Under the action of frequency modulators on the motors, the motors rotate at the same speed, and the left and right support rods do different linear motion. By converting mechanical energy into potential energy, the irregular three-dimensional wave of a lake can be simulated. A realistic simulation environment is achieved. The device is simple, and easy to operate.

The invention discloses a device and a method for sampling a deep well gas-liquid fluid in ultra-low permeability stratum. The invention utilizes design for ground valve block, reducing combined design for underground sampling pipe and design for lyophilic / hydrophobic phase coating in reducing pipe to realize gas-liquid fluid sampling and accurate control on sampling process. Due to the design forground valve block, fluid, especially sampling rate and sampling volume of fluid, can be controlled, and the problems of rapid pressure drop, sample distortion, and the like, caused by the sampling process can be reduced. Due to the reducing combined design for underground sampling pipe and the design for lyophilic / hydrophobic phase coating in reducing pipe, the effective ratio of sample is increased. The device disclosed by the invention is convenient in operation; the operation method is simple and practicable; the sampling volume and the influence on stratum are greatly reduced; the deviceis suitable for deep well sampling and monitoring in low-permeability and ultra-low permeability stratums; the problems of greatly reducing stratum pressure, sample distortion, slow pressure recovery, long sampling time interval and low sampling efficiency possibly caused after the sampling of fluids in deep wells in low-permeability and ultra-low permeability stratums can be solved.

The invention discloses an intelligent vital sign detecting device, comprising a millimeter wave radar part, a DSP processor part, a signal output part, a memory module, a WIFI module and the like. The DSP processor sets up two parts to calculate that processing information respectively, A signal separation module is used to separate the breathing and heartbeat waveforms, the waveform and frequency of respiration and heartbeat are obtained through the DSP processor and sent to a memory module for memory storage, and compared with the real-time monitoring data, If the value exceeds the standard, it will be processed by voice alarm and sent to the host computer through WIFI and the current location will be located. The device utilizes the effective combination of the memory module and the WIFI module to intelligently judge the waveform and the frequency of the breath and the heartbeat of the monitored person, and realtime broadcast and display and can be operated by WIFI interconnection.

The invention discloses a magnetic loss automatic test platform and a sinusoidal excitation signal source used by the same. The magnetic loss automatic test platform comprises a power analyzer, an upper computer, the sinusoidal excitation signal source, a power amplifier and the like. The power analyzer collects information such as an excitation voltage and a frequency of a tested magnetic core and feeds back monitored voltage, current and power signals to the upper computer; the upper computer adjusts the sinusoidal excitation signal source in real time based on the monitoring results; the power amplifier generates a power signal to enable the tested magnetism to work in an expected scope. The sinusoidal excitation signal source comprises a single-chip with the model of STC89C52, a DDS chip with the model of AD9834, a DAC chip with the model of AD5620, a first resistor, a second resistor and a 75 MHz crystal oscillator. The magnetic loss automatic test platform and the sinusoidal excitation signal source used by the same are applicable for design of magnetic loss automatic test platform circuits, and have a wide application foreground.

The invention discloses a GaAs based composite collecting region trajectory transmitting heterojunction bipolar transistor comprising, a semi-insulating GaAs substrate, a N#+[+] adulterated GaAs collecting sub-region grown on the semi-insulating GaAs substrate, a composite collecting region grown on the N#+[+] adulterated GaAs collecting sub-region, a heavy type P GaAs base grown on the composite collecting region. On the base region a type N InGaP emitting region is formed the top of which is a cap layer used for making Ohm contact, an emitting electrode is formed on the cap layer, and a base electrode is formed on the type N InGaP emitting region on the base region.

The invention discloses a method for controlling the evaporation pressure of an air conditioner evaporator. The method comprises the steps that the indoor dry bulb temperature and relative humidity are measured, calculating with the target dry bulb temperature and the target relative humidity is carried out to obtain the corresponding residual error, corresponding sensible heat load and wet load are obtained through the corresponding residual error, and then the entire indoor heat load is solved and obtained; and the initial compressor frequency is obtained, then the compressor frequency is adjusted to adjust the evaporation pressure of the evaporator, the indoor relative humidity control is achieved, the control effect is improved , and the technical effects of improving the energy savingand comfort of a system can be achieved.

The invention discloses a micro-grid combination control method based on an inverter in an energy storage unit. The control method is characterized in that inverter power supplies (of a micro-grid) which operate in a parallel manner before the micro-grid combination all adopt droop control policies; the inverter power supplies adopting the droop control policies adopt an operation mode of peer-to-peer control; a static switch which is used as a grid combination switch-on switch is adopted between the micro-grid and a power frequency power grid; the micro-grid combination control method comprises the following steps of: measuring and calculating a voltage amplitude value difference and a frequency difference at two sides of a public coupling point of the micro-grid and the power frequency power grid; adding the energy storage unit for adjusting so as to enable the voltage phase angle difference to meet voltage phase angle constraint conditions; closing a grid combination switch when all constraint conditions are met; and switching over inverter control policies of the energy storage unit to accomplish the whole process of the grid combination after the switch is closed. According to the method, the impact caused by the grid combination is reduced, and the micro-grid is smoothly combined into the power frequency power grid.

The invention relates to a working state control system and method for a black-start electric control system of a water turbine speed regulator, in particular to eight working states of the electric control system under the black-start condition of the water turbine speed regulator. The invention relates to an electric control method and an execution control method in each state, namely, a shutdown standby state, a startup process state, a no-load state, a load state, a shutdown process state, a black-start startup process state, a black-start no-load state and a black-start shutdown process state which are mutually switched in turn, and aims to solve the problem that in the black-start process of a speed regulator, in an automatic or manual mode, the speed regulator cannot be powered on or powered off. Meanwhile, the problems of smooth transition, reasonable conversion and the like of the eight working states of the electric control system of the water turbine speed regulator when the automatic mode and the manual mode are mutually switched are solved. The speed regulator electric control system can normally control and regulate the guide vane opening degree, the unit power and the unit frequency under the black-start working states of the speed regulator, and the control target of the working states is achieved.

The invention relates to a polyester woven label and a preparation method thereof. The preparation method of the polyester woven label comprises the following steps that 1, weft yarn processing is performed, wherein weft yarns are preprocessed, and then alkali weight reduction finishing and anti-static finishing are performed; weft yarns re twisted to reach 180-250 / m; 2, label weaving is performed, wherein conventional warp yarns and the weft yarns in the step 1 are adopted to perform label weaving in a label weaving machine, wherein the number of texture structures for label weaving is controlled to be smaller than 4, and the tightness of the warp and weft yarns of the woven label is greater than 4200; 3, label cutting is performed, wherein label cutting and stripping are performed by adopting an ultrasonic blade with the thickness of 0.25-0.45 mm; 4, resin finishing is performed, wherein label strips obtained in the step 3 are subjected to resin finishing, and then drying is performed under the pressure of 3-4.5 kg / cm <2> and the temperature of 115-130 DEG C; shearing and folding are performed to obtain the polyester woven label. The polyester woven label free of raw edges and loosen yarns can be prepared by adopting the preparation method.

The invention discloses a cleaning system applied to a film blowing process. A manufacturing shop is sequentially divided into a material area, a production area, a packaging area and a storage area in an independent divisional form; the production area is divided into a forming area, a material sucking area, an extrusion area and a first air return area which are positioned on one side of the forming area, and a slitting area and a second air return area which are positioned on the opposite side of the forming area; two opposite side walls of the forming area are provided with shutter air holes; a joint of the forming area and the extrusion area and a joint of the forming area and the slitting area are provided with a ventilation device respectively. Each area in the cleaning system is independently controlled, the volume and the speed of airflow are adjusted in a targeted manner, and the effect of saving energy is achieved; by combining the production flow of the film blowing process, external pollutants are systematically prevented from entering the production area, and an internal airflow control technology is used for ensuring that the dynamic cleanliness of the production area reaches thousand class level. The invention also discloses an implementation method of the cleaning system applied to the film blowing process.

The invention discloses a millimeter wave agility signal open loop amplitude control method and device. The millimeter wave agility signal open loop amplitude control method comprises the steps that amillimeter wave signal with the broadband of 10 MHz to 67 GHz is divided into four frequency band signals with the frequency bands of 10 MHz to 3 GHz, 3 GHz to 20 GHz, 20 GHz-40 GHz and 40 GHz to 67GHz, and the four frequency band signals are amplified and attenuated to obtain amplitude adjusting signals; the amplitude adjusting signals are subjected to harmonic wave filtering to obtain filteredsignals; the filtered signals are synthesized and subjected to coupling output to obtain a coupling output signal; according to a temperature control word, a power control word and a frequency control word, the coupling output signal is subjected to digital processing and table look-up amplitude correction to generate an amplitude control word; the amplitude control word is converted into an analog signal; the analog signal is continuously transmitted back to an electrically controlled attenuator for controlling a signal attenuation amount; and a millimeter wave agility signal is output. High-stability and high-precision control is achieved; the accuracy of the output signal is less than 0.5dB; the amplitude control precision is less than 0.5dB; and the frequency, the amplitude, the phaseand the modulation speed of the output signal are within 100 ns.