79results about How to "Guaranteed automatic adjustment" patented technology

An articulated anchor and a prestress tensioning method of high strength fibre composite sheet relate to an anchor holder used to perform prestress tensioning to the high strength fibre composite material of the enhancement or reinforcement engineering structure and a method thereof. The articulated anchor of the invention comprises an anchor head and a compression and locking device, and the articulated anchor is characterized in that the anchor head contains a raised head anchor and a concave block. The method of the invention is that the articulated anchor is used to clamp and anchor the two ends of FRP sheet, a jack is used to apply a tension on the concave block and the concave block pushes the raised head anchor to perform prestress tensioning to FRP sheet. The articulated anchor of the invention has simple structure, convenient installation and low cost; and the method of the invention is simple, intuitive and practical, and can ensure the tensioning uniformity of FRP sheet, made full use of the intensity of FRP sheet and effectively increase the bearing capacity of the engineering structure. The articulated anchor of the invention can be widely used to enhance or reinforce the large engineering structures such as bridges or buildings and especially to perform external prestressing reinforcement to longspan concrete beams, longspan concrete slabs and the like.

The invention relates to a colour-changing control method for liquid crystal sunglasses and a control device thereof. A control module which can output the control voltage according to the change of a light intensity sensing signal is provided, the output control voltage thereof is applied to liquid crystal lens to control the light transmission rate of the liquid crystal lens; a photoelectric change battery which can receive visible light is used to provide power for the control module, the photoelectric battery is used to input the light intensity sensing signal to an input control module; a lower limit threshold value and an upper limit threshold value of the working voltage of the control module are set, when the light intensity sensing signal applied by the photoelectric battery on the control module is lower than the lower limit threshold value of the working voltage, the control module does not work; when the light intensity sensing signal applied by the photoelectric battery on the control module is higher than the lower limit threshold value of the working voltage and lower than the upper limit threshold value, the control module works to output the control voltage varying with the light intensity sensing signal. The device has the advantages of simple structure, small volume and less energy consumption so that colour of the sunglasses containing the device can vary with the external light intensity.

The invention provides a mobile satellite uplink adaptive coding and modulation method based on partial channel information. For realizing adaptive coding and modulation of ground terminals, a transmitter obtains equivalent uplink line of sight channel information through an open loop method according to reciprocity of mobile satellite uplink and downlink line of sight channel information, and bya closed-loop system, the transmitter obtains multi-path channel statistics information fed back by a receiving end. The invention also provides an optimal adaptive algorithm suitable for the mobile satellite uplink, wherein a ground end calculates an optimal switching threshold through an optimization algorithm based on the acquired partial channel information, and thus, adaptive switching of coding and modulation modes is realized. The method provided by the invention effectively overcomes boundedness of the existing mobile satellite adaptive method, avoids influence of channel information feedback delay on adaptive performance and guarantees implementation of reliable and efficient adaptive coding and modulation under a mobile satellite communication environment.

The invention relates to a wind turbine comprising a rotor including one or more rotor blades, a pitch system for controlling the pitch angle of said one or more rotor blades, said pitch system comprises at least one pitch actuator, a pitch controller for generating pitch actuator control signals and sensor elements for establishing values of pitch performance parameters, and a compensation controller to compensate for disparities between said pitch actuator control signals and said values of pitch performance parameters, according to a control algorithm. The the compensation controller is arranged to adjust parameters of the control algorithm of said compensation controller in dependency of said disparities. Furthermore the invention relates to a method for compensating for disparities in a wind turbine rotor blade pitch system and use of a method.

The embodiment of the invention discloses a photographing method that includes steps of: acquiring the shake speed of a current frame by using the speed information of a previous frame of image duringa photographing shake; acquiring the shake displacement threshold of the current frame by using the imaging parameter information of the current frame, wherein the imaging parameter information includes the pixel width, the object distance and the image distance of an imaging sensor; and calculating the exposure time threshold of the current frame according to the shake speed of the current frame and the shake displacement threshold of the current frame; and adjusting the actual exposure time of the current frame according to the exposure time threshold of the current frame. The embodiment of the present invention also discloses a photographing terminal.

The invention provides an electric power system node voltage automatic adjusting method, and refers to a cycle process; the method can adjust for many times, can solve the sensitivity of a PV node onan off-limit node voltage, and can solve the sensitivity of a reactive compensation node on an off-limit node voltage, thus obtaining the optimal PV node voltage adjusting amount and the reactive compensation node reactive adjusting amount. In an adjusting process, no artificial intervention is needed except giving the target voltage and voltage allowable deviation of each off-limit node, thus solving the problems that an artificial node voltage adjusting mode is time and labor wasting; in electric power system trend analysis, the method can greatly save work hours, thus improving the calculation and analysis efficiency. When the two sensitivities are solved, the automatic adjusting method mainly employs calculation methods that have no convergence problem, such as matrix inversion, matrixpartitioning, and matrix multiplication; the whole adjusting method is good in convergence, and can automatically finish the adjustments.

The invention provides an included angle and gravity center varying mechanism for tail fins of a bio-robotic fish. The mechanism comprises a housing, a lead screw, guide rods, a slide block, a balancing weight, racks, gears, shafts and the tail fins, wherein the guide rods, the racks, the gears and the tail fins are symmetrically distributed about the lead screw. According to the mechanism, the lead screw can be rotated to drive the slide block, the balancing weight and the racks to move forwards and backwards, and on that basis, included angles of the tail fins can be switched between a cruising mode and a charging mode; the balancing weight can move to automatically adjust the gravity center of the bio-robotic fish; when the bio-robotic fish is to enter the cruising state, the lead screw can be clockwise rotated to drive the balancing weight and the racks to move forwards, and the movement of the racks can drive the gears to rotate to enable the tail fins to backwards incline relative to a fish body, so that the gravity center can move forwards, and as a result, the fish body can keep balance and remain stable so as to enter the cruising state; if the bio-robotic fish is to enter a charging state, the lead screw can anticlockwise rotate to drive the balancing weight and the racks to move backwards, and the movement of the racks can drive the gears to rotate to enable the tail fins to be vertical to the fish body, so that the gravity center can move backwards, and as a result, the fish body can keep balanced and remain stable so as to enter the charging state.

The invention relates to thawing equipment for frozen blood products, which comprises a thawing furnace arranged in a box body, a thawing box, a heater and an automatic control device, wherein the heater is a magnetron (microwave generator), the thawing furnace is a microwave thawing furnace, the thawing box is a microwave thawing box which is arranged on a rotatable rotating disk in the microwave thawing furnace, the automatic control device is an infrared temperature probe, an intelligent temperature controller and an electric control element and is connected with the magnetron, a button, an infrared temperature gauge, a timer and an ampere meter through a control circuit, wherein the button, the infrared temperature gauge, the timer and the ampere meter are arranged on an operating panel of the box body. A magnetron microwave water heating method is replaced with a traditional water bath method without preheating, therefore, the preparation time is saved, the thawing speed is high, and the energy and the water are saved; the thawing equipment with a self-providing supply can work for 30 minutes with convenient carrying; by adopting the infrared temperature probe and the intelligent temperature controller, the thawing equipment has high measurement and control accuracy, ensures that the thawing temperature can be automatically adjusted within safety range, guarantees the blood product quality, and is especially suitable for rapidly providing blood products during the emergence of field operations and disasters.

The invention relates to a computer with a function of automatic adjustment based on smart home, and the computer comprises a display screen, adjustment mechanisms, and a substrate. The substrate is in transmission connection with the display screen through the adjustment mechanisms. The front surface of the display screen is uniformly provided with four cameras. The computer employs the horizontal axial adjustment mechanism, the height adjustment mechanism and the vertical axial adjustment mechanism to respectively adjust the horizontal angle, height and vertical angle of the display screen, and can guarantee the adjustment of the display screen at different angles. The four cameras are used for recognition of the head of a user and the feedback, and achieve the automatic adjustment function of the computer. Moreover, a first triode, a second triode, a third triode and a fourth triode form an H-bridge control circuit in a motor drive circuit, thereby achieving the bidirectional control of a motor, and improving the reliability of automatic adjustment.

The invention discloses a circular cutting blade with an accurate positioning structure and a cutting tool. The circular cutting blade comprises a circular blade body which consists of an upper surface, a lower surface and side surfaces connecting the upper surface to the lower surface, wherein a central hole which penetrates through the upper surface and the lower surface is formed in the blade body; the blade body is centrosymmetric with respect to a central axis of the central hole; the upper surface is crossed with the side surfaces to form cutting edges; at least one circular-arc-shaped groove which is matched with the surface of a fastening screw for fixing the circular cutting blade is formed in the inner surface of the central hole; and offset distance is formed between the groovecentral axis of the circular-arc-shaped groove and the central axis. The cutting tool adopts the cutting blade. The circular cutting blade has the advantages of being reliable and stable in positioning, prolonging the service life of the cutting blade and being capable of preventing the circular blade from rotating in the peripheral direction.

The invention discloses a double-column blowing-needle-height-automatic-adjusting nitrogen blowing concentrator and belongs to the field of a nitrogen blowing concentration or purification device. Thenitrogen blowing concentrator comprises a heat insulation shell base, a heating plate, a heating tank, a test tube stand, a nitrogen blowing device, a temperature sensor and an integrated control device. The heating plate is mounted in the heat insulation shell base; the heating tank is mounted on the heating plate; the test tube stand is mounted on the heating tank; the temperature sensor is mounted in the heating tank; the integrated control device is mounted on the front surface of the heat insulation shell base; and the nitrogen blowing device is mounted above the heat insulation shell base. The nitrogen blowing concentrator is characterized in that the nitrogen blowing concentrator also comprises a double-column lifting device and a water level alarm device. The nitrogen blowing concentrator can automatically adjust the height of the nitrogen blowing device, is stable in operation and high in positioning accuracy, can carry out nitrogen blowing concentration or purification on mixed liquid to be concentrated or purified in multiple tubes and can prevent dry burning of the heating tank.

The invention discloses an environmental-friendly synthetic paper production method based on a two-way stretching process. Based on the prior art, a center pipe with a sleeve structure form is adopted on a mouth mould, a paper film is expanded and cooled by using external compressed air in a primary forming stage, and transverse stretching and stretching amplitude of the paper film in the primary forming stage are automatically regulated by using a mutual matching and cooperating function of a strutting device sleeving an inner pipe of the center pipe and an airflow, the paper film is limited by gas introduced between the paper film and the wall of a cylinder by using the cylinder arranged outside the strutting device; by adopting a series of technical means of immediately guiding a hot airflow in a paper film cylinder for being recycled by using the center pipe and improving a guide device into a roller type guide structure, compared with the prior art, the environmental-friendly synthetic paper production method has the beneficial effects that the process is simply controlled, the core process parameter of a key procedure is regulated conveniently, the product quality is stable, the production cost is low and the like.

The invention provides a VMOS switching control circuit with robustness. The VMOS switching control circuit with the robustness mainly solves the problems that an existing low-voltage new energy power converter is high in power consumption, low in efficiency and poor in reliability. An output current sampling circuit of the VMOS switching control circuit with the robustness comprises a current sensor CS2, a capacitor C9 and a diode D5, the current sensor CS2 and the diode D5 are connected in series to form a subcircuit, and the capacitor C9 is connected with the subcircuit in parallel. A reverse isolation circuit is formed by a VMOS group performing synchronous rectification with a VMOS switching circuit and is synchronously driven by a driving signal synthesis circuit through a freewheeling driving circuit. An energy storage filter circuit is provided with a capacitor, the positive end of the capacitor is connected with the positive end of a load, and the negative end of the capacitor is connected with the negative end of the load. An output protection circuit is further arranged before the load.

The invention provides an output protection type PWM boost control circuit. The output protection type PWM boost control circuit mainly solves the problem that an existing low-voltage new energy power adapter is high in power consumption, low in efficiency and poor in reliability. The output protection type PWM boost control circuit comprises two differential-mode symmetric inductors and an output protection circuit, and the two differential-mode symmetric inductors are arranged at the positive end and the negative end of an input power output end respectively. An output current sampling circuit comprises a current sensor CS2, a capacitor C9 and a diode D5, the current sensor CS2 and the diode D5 are connected in series to form a branch circuit, and the capacitor C9 is connected with the branch circuit in parallel. A common cathode diode is adopted by a reverse isolation circuit.

The invention provides a high-efficiency output power supply adaption circuit for an LED chip, which mainly solves the problems of high power consumption, low efficiency and poor reliability of a low-voltage new-energy power converter. The output end of an output power supply of the high-efficiency output power supply adaption circuit for the LED chip is respectively connected with the input end of a flow current inductor and the input end of an input current sampling circuit, the output end of the flow current inductor is connected with the input end of an VMOS (V-groove metal oxide semiconductor) switch circuit, the input end of the VMOS switch circuit is further connected with the output end of a control circuit, and the output end of the VMOS switch circuit is connected with a load through a reverse isolation circuit, an energy storage filter circuit and an output protection circuit sequentially. The high-efficiency output power supply adaption circuit for the LED chip can more efficiently and reliably provide power to the LED chip at a low cost, and has no requirement on the form of low-voltage input voltage; the added output protection circuit can guarantee current-limited output of the LED chip in accidental short circuit during the work of the LED chip, and meanwhile, low power consumption can also be guaranteed.

The invention relates to a colour-changing control method for liquid crystal sunglasses and a control device thereof. A control module which can output the control voltage according to the change of a light intensity sensing signal is provided, the output control voltage thereof is applied to liquid crystal lens to control the light transmission rate of the liquid crystal lens; a photoelectric change battery which can receive visible light is used to provide power for the control module, the photoelectric battery is used to input the light intensity sensing signal to an input control module; a lower limit threshold value and an upper limit threshold value of the working voltage of the control module are set, when the light intensity sensing signal applied by the photoelectric battery on the control module is lower than the lower limit threshold value of the working voltage, the control module does not work; when the light intensity sensing signal applied by the photoelectric battery on the control module is higher than the lower limit threshold value of the working voltage and lower than the upper limit threshold value, the control module works to output the control voltage varying with the light intensity sensing signal. The device has the advantages of simple structure, small volume and less energy consumption so that colour of the sunglasses containing the device can vary with the external light intensity.

The invention discloses an intelligent control integrated device for online water addition of an organic fertilizer production line. The integrated device comprises a material input conveyor belt, a far infrared laser data collector, a data collection and analysis instruction system, a water adding system, a material stirrer and a material output conveyor belt, wherein the far infrared laser datacollector is arranged above the material input conveyor belt; the data collection and analysis instruction system is connected with the far infrared laser data collector; the water adding system is connected with the data collection and analysis instruction system and arranged above the material stirrer; an inlet of the material stirrer is connected with the material input conveyor belt, an outletof the material stirrer is connected with the material output conveyor belt, and a material stirred by the material stirrer is output by the material output conveyor belt. According to the integrateddevice, effective butting of material humidity and the injection amount of optimum moisture for granulation is realized by online accurate moisture monitoring for the material.

The invention provides a self rectification / guiding power stable switching circuit. An L1, a D3 and a C14 form an LDC of a BOOST circuit, in order to adapt to the asymmetry of an input power supply, such as unipolar direct current, unipolar square waves and unipolar triangular waves, the L1 adopts a differential mode symmetric style, and an inductor can also be arranged only at the positive end or negative end of an input loop to serve as the L1. The BOOST circuit can automatically achieve automatic identification orientation of a bipolar power supply (alternating current sine waves, square waves, triangular waves, alternating current power frequency, medium frequency, low frequency and ultra-low frequency), and automatic identification orientation of a unipolar power supply (direct current, direct current square waves, direct current triangular waves and the like), and the alternating current bipolar power supply and the direct current unipolar power supply can be freely connected regardless of the positive pole and the negative pole. The self rectification / guiding power stable switching circuit solves the problems that an existing low-voltage new energy power supply converter is high in power consumption, low in efficiency and poor in reliability.

The invention provides an MOS transistor conduction low power consumption anti-jamming circuit. The problems that an existing low voltage new energy power adapter is high in power consumption, low in efficiency and poor in reliability are mainly solved. According to the MOS transistor conduction low power consumption anti-jamming circuit, an alternative PWM control mode is used for enabling an M1 and an M2 to be alternatively conducted, the working frequency of each VMOS switch is 1 / 2 of a circuit frequency, the VMOS switches can work in a low switching frequency, and the switching power consumption is greatly lowered. Correspondingly, the working frequency of an L device and a C device in the circuit is twice the frequency of a VMOS transistor, the high working frequency of the circuit lowers the requirement for an inductor (L) and a capacitor (C) in an LC circuit, and cost and technological difficulty are lowered. An output protecting circuit is arranged in front of a load, it can be guaranteed that BOOST output is automatically adjusted when the load is in short circuit, current-limiting output is achieved, and meanwhile low power consumption is still guaranteed.

The present invention discloses an auto centering fitting system for the assembly of rotating electrical machines, comprising a couple of caps (1a) and (1b), wherein said cap (1b) shows a cylindrical geometry, optionally interrupted, comprising a strengthened peripheral region (3b) from which a male-type structure (6) complementary to the channel (4) of the cap (1a) extends longitudinally; and said cap (1a) shows a strengthened region (3a), from which a pair of symmetrical tabs (3c) project distally, which will define a fitting channel (4), forming a junction (5) through the application of axial pressure on both caps in opposite directions to each other, allowing for the fitting of (6) to (4).

The invention relates to a linkage type step hole inner expansion mandrel clamp used for a numerically controlled lathe. The linkage type step hole inner expansion mandrel clamp comprises a support shaft (4), two taper nuts which are oppositely installed on the support shaft (4) at intervals in a threaded manner, and a floating expansion sleeve (6) which is used for tensioning and fixing a part (7) to be machined, the two ends of the floating expansion sleeve (6) are floating end parts (61) with telescopic outer diameters, circular-truncated-cone-shaped holes which are matched with the tapersof the outer surfaces of the taper nuts are machined in the inner sides of the floating end parts (61), and the two taper nuts correspondingly stretch into and abut against the inner wall faces of thecircular-truncated-cone-shaped holes in the two floating end parts (61) respectively, so that the floating expansion sleeve (6) is fixedly arranged on the supporting shaft (4) in a sleeving mode. Compared with the prior art, the linkage type step hole inner expansion mandrel clamp used for the numerically controlled lathe can cooperate with the numerical control lathe, so that turning machining the two end faces and a outer circle of the part at a time is completed, the very high parallelism of the two end faces and the very high perpendicularity of the two end faces and the outer diameter are further guaranteed, and the machining process is flexible and convenient.

The invention provides a PWM control conduction XC / DC circuit for an LED. The circuit is in a wave-shaped positive half cycle when alternating currents are input or is positive up and negative down when direct currents are input. When one of control signals P1 and control signals P2 output by a PWM control circuit (IC1) is in high level, the XC / DC automatic orientation BOOST circuit is in a PWM conduction state, and the currents sequentially flow through a first set of VMOS switching circuit sets (M1 and M2) and a second set of VMOS switching circuit sets (M3 and M4) from the positive end in an input circuit, and then flow back to the negative end. Due to the fact that a D3 plays a role of reverse isolation, stored energy in a C14 can not reversely flow back to the input circuit. The problems that an existing low voltage new energy power adapter is high in power consumption, low in efficiency and poor in reliability are solved.

The invention discloses an animal fat washing device which comprises a melting device, a centrifugal device, a washing separation device, an oil pumping device and a mixing device, a first oil conveying pipe is connected between the melting device and the centrifugal device, and a second oil conveying pipe is connected between the centrifugal device and the washing separation device. An oil pumping device is arranged at the position, close to the second oil conveying pipe, of an inner cavity of the washing separation device, and a mixing device is arranged on the side, close to the oil pumpingdevice, of the inner cavity of the washing separation device. According to the invention, the purity of animal fat is greatly improved, oil-water layering can be continuously carried out, manual monitoring is not needed, the automation degree is improved, the production cost is reduced, and the animal fat and water can enter the mixing cylinder through the second oil conveying pipe and the waterconveying pipe respectively and then are fully mixed by the first impeller, the mixing impeller and the second impeller, thus to improve the washing quality; and the first impeller and the second impeller can quickly push oil and water to one side of the partition plate to finish layering, so that the washing efficiency is improved.

The invention provides an automatically-directed power-switching circuit with an output protection function. The automatically-directed power-switching circuit mainly solves the problems that an existing low-voltage new-energy power converter is high in power consumption, low in efficiency and poor in reliability, and comprises a reverse isolation circuit and an output protection circuit. The output end of the reverse isolation circuit is connected with a load through an energy storage filter circuit, the input end of the reverse isolation circuit is connected with the output end of a VMOS switch circuit, and the input end of the VMOS switch circuit is connected with the output end of an input power through a follow-current inductor; the reverse isolation circuit is composed of a VMOS tube group which is used for synchronous rectification with the VMOS switch circuit, and the VMOS tube group is synchronously driven by a drive signal synthesis circuit through a follow-current drive circuit; the output protection circuit can guarantee that the BOOST output can be automatically adjusted when short circuit of the load happens, current-limiting output is achieved, and low power consumption is also guaranteed.

A cutter clamping device for the shape-following machining of a complex curved surface belongs to the field of mechanical equipment manufacturing and comprises a spindle mounting plate, shape-following springs, hanging lugs, bearings and a shape-following plate; the spindle mounting plate is provided with a spindle mounting hole and shape-following spring positioning blocks; the shape-following plate is provided with a shape-following cushion rail and cutter mounting holes; the shape-following springs are respectively fixed on the shape-following spring positioning blocks of the spindle mounting plate; the hanging lugs are respectively fixed on the shape-following springs; the shape-following plate is connected with the hanging lugs by the bearings. By applying the cutter clamping device, the aim of clamping a cutter for performing shape-following machining on the complex curved surface is realized.

The invention provides a high-stable-output VMOS follow current conduction control circuit which mainly solves the problems that an existing low-voltage new energy power converter is high in power consumption, low in efficiency and poor in reliability. The output end of an input power source of the high-stable-output VMOS follow current conduction control circuit is connected with the input end of a width modulation pulse control circuit through an input current sampling circuit. The output end of an energy storage filter circuit is connected with the input end of the width modulation pulse control circuit through an output current sampling circuit. The output end of the width modulation pulse control circuit is connected with the input end of a VMOS switching circuit through a drive signal synthetic circuit and a VMOS switching drive circuit in sequence. An output protection circuit is arranged in front of a load.

The invention provides a self-protection conversion circuit of an input power supply with undifferentiated output, which mainly solves the problems of high power consumption, low efficiency and poor reliability of the existing low-voltage new-energy power converter. A control circuit in the conversion circuit adopts a current mode PWM (Pulse Width Modulation) controller, two output ends Ao and Bo of the PWM controller are respectively connected to a group of input ends of a driving signal synthesis circuit, an input current sampling circuit comprises a current sensor CS1, a capacitor C13, a resistor R21 and a diode D4, wherein the current sensor CS1 and the diode D4 are connected in series to form a branch; the capacitor C13 and the resistor R21 are respectively connected to the branch in parallel; and an output protection circuit is arranged before a load.

The invention provides an intelligent rectification control high-robustness output circuit. The intelligent rectification control high-robustness output circuit mainly solves the problems that an existing low-voltage new energy power converter is high in power consumption, low in efficiency and poor in reliability. A follow current inductor of the intelligent rectification control high-robustness output circuit utilizes the inductance characteristic to boost an input power supply; in the switching-on process of a VMOS switching circuit, current passes through the follow current inductor; in the switching-off process of the VMOS switching circuit, a follow current circuit is switched on, the current in the follow current inductor continues passing, high voltage is produced to charge an energy storage filter circuit, and the energy storage filter circuit charges a load after being charged; the energy storage filter circuit is used for supplying power to the load in the switching-off process of the VMOS switching circuit; an output protective circuit is arranged before the load.

The embodiment of the present invention discloses a photographing method, the method comprising: obtaining the shaking speed of the current frame by using the speed information of the previous frame image when photographing shaking; obtaining the shaking speed of the current frame by using the imaging parameter information of the current frame The shake displacement threshold value; the imaging parameter information includes: the pixel width, object distance and image distance of the imaging sensor; according to the shake speed of the current frame and the shake displacement threshold value of the current frame, calculate the current The exposure time threshold value of the frame; adjusting the actual exposure time of the current frame according to the exposure time threshold value of the current frame. The embodiment of the invention also discloses a camera terminal.

The invention provides a noise elimination system and noise elimination method for an air inlet and exhaust system and a vehicle. The noise elimination system comprises a signal acquisition unit, a control unit and an execution unit, wherein the signal acquisition unit is used for acquiring sound pressure signals in an air inlet cavity of an air inlet pipeline, the control unit is used for carrying out frequency spectrum analysis on the sound pressure signals so as to obtain an actual peak frequency in the air inlet cavity, comparing the actual peak frequency with a preset peak frequency of the control unit, and sending a corresponding control instruction according to the comparison result. The execution unit can adjust the size of an expansion cavity of a silencer of the noise eliminationsystem according to the control instruction, the purpose of automatic noise elimination and noise reduction is reached. The noise elimination system is provided with the signal acquisition unit, thesound pressure signals in the air inlet pipeline are collected, and the sound pressure signals can be automatically adjusted according to the actual variable noise environment, so that the purpose ofautomatically carrying out noise elimination and noise reduction is achieved.