107results about How to "Reduce the risk of instability" patented technology

The invention discloses a hot patching implementation method of an embedded system. The method includes: finding the old function in an existing system, changing the first instruction of the function into a skip instruction with the skip address pointing to a new function so as to allow the new function to replace the old function. By the method, system software function updating and defect fixing can be completed while a software system cannot be replaced and equipment restarting is unavailable.

This is a cable stayed steel truss module structure and its construction method. At least two steel trusses are installed to support a high building to be grouted with connecting steel held in between. At least four truss cables are stayed between the building and the steel truss. Beam is installed on the top of the truss with falsework module fixed to the beam.

The invention discloses an emergency control method for high-voltage direct-current continuous commutation failure, and belongs to the technical field of power systems and power system automation. The continuous commutation failure of a direct-current power transmission system possibly causes transient power angle instability of a power grid at a transmitting end; a primary reason for causing system instability by the continuous commutation failure is that an accumulated acceleration area of a power generator is greater than a deceleration area due to consecutive sudden drop of direct-current transmitting power; and an accumulated quantity of commutation failure time in a safety and stability control apparatus is taken as an instability criterion and a matching basis of a generator tripping scheme. In an interval from critical accumulated commutation failure time to direct-current blocking critical commutation failure time, the safety and stability of the system are ensured only by adopting generator tripping measures; and if the accumulated commutation failure time is longer than the direct-current blocking critical commutation failure time, it is required to perform generator tripping after blocking related direct current. According to the method, a process of judging instability and a matching policy table is simplified for complexity of the continuous commutation failure, so that the requirements of actual engineering can be met.

The invention relates to a vibration-proof building unit, in particular to a composite damping single-piston rod viscous damper. The damper is a single-piston rod viscous damper and is characterized in that: a piston rod (2) of the single-piston rod viscous damper passes through a left end cover (1) through a working cylinder (10) on the left of a piston (5); a cylindrical spiral spring (60 is arranged in the working cylinder (10) on the right of the piston (5); one end of the spring is fixed on a right end cover (7), while the other end is fixed to the end face of the piston (5); an outer cylinder barrel (4) is sleeved outside an inner cylinder barrel (3) of the working cylinder (10); the left end cover (1) and the right end cover (7) are respectively arranged at two ends of the outer cylinder barrel (4), so that a gap between the inner cylinder barrel (3) and the outer cylinder barrel (4) forms a compensation cylinder (11); one one-way valve (13) is arranged in the body of the left end cover (1); and another one one-way valve (12) is arranged in the body of the right end cover (7). The viscous damper can simultaneously provide viscous damping and elastic damping in the whole moving process of the piston.

The invention relates to a quick coring drilling system without a marine riser and method based on circulating drilling fluid. The quick coring drilling system comprises a mud circulation system and acoring drilling system body, wherein the coring drilling system body comprises a drill pipe, a spearhead, a driving device, a hydraulic down-hole hammer, a core pipe and a drill bit which are sequentially connected from top to bottom inside the drill pipe; the mud circulation system comprises a return cone, a recovery pump, a mud tank, a mud pump and a conveying pipeline group; the conveying pipeline group comprises a first conveying pipeline, a second conveying pipeline and a third conveying pipeline; and the mud tank, mud pump, the drill pipe, the return cone and the conveying pipeline group are in communication with each other to form a mud circulation channel. The quick coring drilling system does not use the marine riser, the time for lowering a pipe column is reduced, the emergencyrelease speed is accelerated, the connection can be quickly performed through the return cone, time and cost are saved, and the risk of wellhead instability is reduced.

The invention belongs to the field of aero-engine oil supply, and particularly relates to an oil supply correction method in the case of starting an aero-engine at a plateau. The method comprises thefollowing steps of obtaining a power characteristic coefficient epsilon of an auxiliary power system and a power acting proportion coefficient lambda of the auxiliary power system, and calculating anauxiliary power correction coefficient K<auxiliary>; obtaining a correction coefficient K<conventional> performed according to the engine characteristics and an engine ground starting rotating speed rise rate N<2> Dot<ground>, and calculating an engine plateau starting rotating speed rise rate N<2> Dot< plateau>; and calculating a main fuel supply rule according to the engine plateau starting rotating speed rise rate N<2>Dot< plateau>. According to the method, the more real auxiliary power is obtained through correction according to the auxiliary power system power keeping characteristic, comprehensive conversion is performed to form the rotating speed rise rate correction amount according to the proportion relation between the auxiliary system power in the starting rotating speed range and the turbine power, the starting process is corrected, the rotating speed rise rate is more matched with the actual residual power, the oil supply amount is corrected to fully exert the starting potential, the starting time is shortened, and the starting success rate is increased.

The invention discloses a method for realizing persistence of a memory database, which comprises the following steps of: writing a writing operation into a persistence layer, and then writing into a Redis memory database; performing data elimination on the Redis memory database; eliminating the cold data eliminated by the Redis memory database; and reading the Redis memory database by a reading operation, and when the corresponding data is not read, reading the data in the persistent layer and reversely writing the data into the Redis memory database. By adopting the design of separating the cache layer from the persistent layer, the server is transformed, and a persistence scheme for optimizing the native Redis is transformed into a persistence scheme in which the persistence part is independently processed by the LevelDB, so that the instability risk of the native persistence scheme is reduced; the data security and the system recovery efficiency are improved; and the problem that the Redis memory database is crazy and occupies the memory is solved.

The invention is applicable to the technical field of transformer substation service handling, and provides a transformer substation service self-service handling method and device. The method comprises the steps of: receiving a work ticket, and identifying the work task content of the work ticket; determining corresponding safe delivery content according to the identified work task; and playing the safe delivery content. The work task of the work ticket is identified, the work ticket is checked and verified through self-service, the video is used for introducing the field safety risk and identifying charged parts, the personnel safety delivery content is confirmed by verifying the fingerprints and the identities of all the workers, and then a temporary work card is made for each worker, so that the workers can enter a work area or open a work screen cabinet by holding their cards, paperless office and safety management and control of a transformer substation are achieved, the business handling efficiency is greatly improved, the equipment maintenance time is reduced, and the unstable hidden danger of a power system is reduced.

Disclosed is a liquid cooling module for computer servers, including: a pump, a fan, a heat exchanger, at least two ventilation grilles, an open central longitudinal space between the pump and the heat exchanger that is arranged to facilitate airflow therein from a grille of one short side wall to a grille of the other short side wall, this airflow being driven by the fan, a portion of secondary hydraulic circuit located in the liquid cooling module, for circulating a fluid coolant, including no bypass that would allow the pump to operate as a closed circuit and likely to clutter this open longitudinal space, a circuit control board positioned in the longitudinal extension of the open central longitudinal space so as to be directly swept by the airflow.

The invention provides a control platform of automation equipment with multiple interaction channels. The platform comprises an event management module, an action execution management module, a service management module and a center management module, wherein the event management module is used to distribute events to each registered event processing program for processing; the service management module is used to execute specific business processes of a service and call a corresponding achievement interface according to state changes during service execution; the action execution management module is used to run working processes of an action and call the corresponding achievement interface according to the state changes of the action during running; and the center management module is used to control each module in the control platform to conduct registration and monitoring. The platform provided by the invention has the advantages that cooperative stability between each module and each business working process in the automation equipment could be enhanced; complexity of development of each business working process and each input and output module in the automation equipment could be reduced; and stability of overall running of the automation equipment could be enhanced.

The invention relates to a road marking having multiple depressions introduced into the road surface, the depressions comprising two lateral longitudinal walls, extending in the longitudinal direction of the road, that transition, proceeding from the road surface, continuously into a bottom region; and the depression being delimited by two transverse walls extending transversely to the longitudinal direction of the road. The road markings have improved utilization properties if provision is made that the longitudinal walls comprise a region convexly curved transversely to the longitudinal direction of the road. The invention further relates to a cutting unit for producing such road markings.

The invention relates to a method for cooperatively regulating and controlling the phase state of a natural gas hydrate in a reservoir through a drilling fluid additive and a temperature and pressurefield, and belongs to the technical field of natural gas hydrate development. The method comprises the following steps of calculating dynamic distribution rules of a reservoir temperature field and anatural gas hydrate decomposition interface under the conditions of different drilling fluid displacements, injection temperatures and drilling fluid additive concentrations, and drawing a relation curve of the drilling fluid additive concentrations, the injection temperatures and the displacements with the saturation of the reservoir natural gas hydrate; and obtaining an optimal combination of drilling fluid additive concentration, injection temperature and displacement by utilizing a particle swarm algorithm, so that the saturation change of the reservoir natural gas hydrate is minimum. Accurate regulation and control of the reservoir natural gas hydrate phase state of deep-sea shallow-layer complex-structure well drilling can be achieved, and method guidance is provided for inhibiting reservoir natural gas hydrate decomposition in the drilling process.

The invention discloses a lead optimizing method for a P300 brain-computer interface (BCI) and relates to the technical field of the BCI. The method comprises the following steps of: acquiring an event phase locking value according to L leads with the preset number, establishing distance factor matrixes among leads according to the event phase locking value, and defining the intensity of phase synchronism among the leads; acquiring a clustering tree by a hierarchical clustering method according to the distance factor matrixes among the leads; establishing a lead importance sorted table according to the clustering tree and the intensity of phase synchronism among the leads; computing a precision rate of the lead importance sorted table, and acquiring L precision rate values; and sorting the L precision rate values, taking the lead combination with the highest precision rate value as the optimal lead combination, and outputting the optimal lead combination. In the method, the event phase locking value and the hierarchical clustering method are integrated, the number of characteristics sources is calculated and determined, the redundancy leads of a BCI system can be effectively reduced, the instability risk of the BCI system is reduced, and operation program is simplified.

The invention provides a falling prevention device of a carrying trolley, which comprises a stop lever, a first limiting switch, a second limiting switch, a linear motor, a base and a motor rack. The stop lever is connected with the linear motor via the motor rack, the motor rack is driven by the linear motor to be capable of driving the stop lever to stretch and retract in a reciprocating manner, and the movement range of the stop lever is limited between the first limiting switch and the second limiting switch. The invention further provides a three-dimensional parking garage. Compared with the prior art, the falling prevention device of the carrying trolley effectively reduces risks caused by instability of electrical elements via a mechanical limiting mechanism. Besides, the linear motor drives the motor rack to be connected with the retractable stop lever, even if the retractable stop lever is collided with the carrying trolley, the motor cannot be damaged, the carrying trolley can continue being used after the stop lever is replaced directly, and maintenance cost is lowered effectively. In addition, compared with the prior art, the falling prevention device of the carrying trolley and the three-dimensional parking garage are simple in structure, convenient in installation, low in cost and safe and reliable in use.

The invention relates to an optical path assembly auxiliary device of a three-axis integral optical fiber gyroscope. In the optical path assembly auxiliary device, a horizontal rotary plate is connected with a base by a clamping spring through a shaft A, the horizontal rotary plate can rotate relative to the base, the horizontal rotary plate is connected with an angle positioning block A through a short rotary shaft A, the horizontal rotary plate can rotate relative to the angle positioning block A, the horizontal rotary plate is connected with an angle positioning block B through a short rotary shaft B, the horizontal rotary plate can rotate relative to the angle positioning block B, a pitch rotary plate is connected with the horizontal rotary plate through a long rotary shaft A and a long rotary shaft B, the pitch rotary plate can rotate relative to the horizontal rotary plate, an angle rotary plate is connected with the pitch rotary plate by a clamping spring through a shaft B, the angle rotary plate can rotate relative to the pitch rotary plate, and the angle rotary plate is provided with a hole matrix for mounting and fixing a three-axis integral optical fiber gyroscope body. The optical path assembly auxiliary device aims to provide fixing equipment and gesture adjusting equipment for the assembly of the optical path of the three-axis integral optical fiber gyroscope, the assembly efficiency of the optical path is improved, and the batch production of the gyroscope is promoted; additionally, the risks of breakage of an optical device tail fiber and damage of an optical device, due to false operation of operators, are reduced during the optical path assembly process, and the qualified rate of the gyroscope in production is improved.

The present invention relates to a chip resistor detection method, system and device. The method comprises the steps of moving a substrate comprising a plurality of chip resistors under a standard probe card of a measurement card, and measuring the general resistance values of the chip resistors on the substrate; moving the substrate under a 140 high voltage probe card of a high-voltage device, and applying a preset time of high voltage on the chip resistors on the substrate; moving the substrate applied with the high voltage under a standard probe of the measurement device, and measuring the high-voltage resistance values of the chip resistors on the substrate; determining whether the chip resistors are abnormal resistors according to whether the difference of the high voltage resistance values and the general resistance values is within a preset difference range; cutting through the abnormal resistors according to the determination results. By the above chip resistor detection method, system and device, the chip resistors can be determined whether to be the abnormal resistors according to whether the difference of the high voltage resistance values and the general resistance values is within the preset difference range, and the abnormal resistors are cut through according to the determination results, so that the resistor stability yield can be improved, and the risks brought by the resistors instability can be reduced.

The invention provides a construction method of an air duct structure sharing a side wall together with a subway station. The construction method of the air duct structure sharing the side wall together with the subway station specifically comprises the steps of firstly, adopting a mode of erecting templates on the two sides to construct the side wall shared by the air duct structure and the subway station; secondly, breaking station fender posts in a shared side wall area according to a mode of breaking one post every 2-4 posts; finishing excavation of earthwork and construction of an air duct bottom plate, wherein the air duct bottom plate is connected with a station middle plate through a fender post breaking area to form a temporary support; after a station main body structure is constructed, breaking the rest fender posts, and pouring micro-expansion concrete in the breaking area; and fixing the template on the air duct side of the shared side wall on a supporting net sheet by embedding a steel reinforcement anchor bolt in the station building envelope and welding the supporting net sheet on the exposed end of the steel reinforcement anchor bolt. The construction method of theair duct structure sharing the side wall together with the subway station can be widely used for construction of the air duct structure when the station and an air duct share the side wall; the apparent mass of concrete of a shared side wall cast-in-place structure is guaranteed; and the occurrence of foundation pit instability accidents is avoided.

The invention relates to an anti-sloughing drilling fluid for a fractured carbonate rock stratum and a preparation method and application of the anti-sloughing drilling fluid in the field of petroleum drilling. The anti-sloughing drilling fluid can be prepared from the following components in parts by weight: 1000 parts by weight of water, 15 to 40 parts by weight of drilling fluid bentonite, 5 to 35 parts by weight of a micro-nano blocking agent, 20 to 70 parts by weight of a temperature-sensitive blocking anti-collapse agent, 15 to 30 parts by weight of graphene hydrogel and 0 to 1600 parts by weight of an inert weighting agent. The anti-sloughing drilling fluid disclosed by the invention has high anti-sloughing performance, rheological property, temperature resistance and lubricating property, can effectively reduce the well wall instability risk of a fractured carbonate rock stratum, reduce bit bouncing and blocking and ensure underground safe construction, and has a wide application prospect.

The invention relates to a method for the automated electronic control of a braking system (100) in a vehicle (200), having at least the following steps: - reading a request signal (S1) for the automated electronic triggering of actuators (1, 50, 52, 53) in the vehicle (200), wherein at least one of the actuators (1, 50, 52, 53) has an influence on an actual longitudinal dynamic of the vehicle (200), and requests (aSoll, vSoll, RSoll) to establish an automatically requested target longitudinal dynamic of the vehicle which are to be implemented by the actuators (1, 50, 52, 53) are transmitted via the request signal (S1); - plausibility-checking the request signal (S1) to determine whether the requests (aSoll, vSoll, RSoll) to establish the automatically requested target longitudinal dynamicof the vehicle are being or can be fully and correctly implemented by the actuators (1, 50, 52, 53); - defining a correction deceleration (zKorr) and / or a correction speed (vKorr) if at least one ofthe requests (aSoll, vSoll, RSoll) is not or cannot be fully and correctly implemented, to specify corrective braking, the correction deceleration (zKorr) and / or the correction speed (vKorr) being determined depending on the request (aSoll, vSoll, RSoll) which is not or cannot be fully and correctly implemented; - requesting the corrective braking of the vehicle (200) depending on the correction deceleration (zKorr) and / or on the correction speed (vKorr) to put the vehicle (200) into a safe state.

The invention discloses a strip mine high-step large-aperture buffer blasting method. The method can improve the effective utilization rate of the depth of blast holes and reduce the influence of blasting vibration on the stability of a side slope on a high step close to a mining boundary through a blasting technology of distributing buffer holes in the last row and filling explosives in the holesat intervals, so that the slope boundary efficiency is improved, the model of stope drilling machine equipment is simplified, and finally efficient, safe and low-cost boundary operation is achieved.

The invention relates to the technical field of a building and particularly relates to a tower tube pouring construction method and a tower tube. The tower tube pouring construction method comprises the steps of: Step 100, respectively arranging an external mold and an internal mold on two sides of the tower tube to be poured; Step 200, arranging a sealed cabin capable of expansion and shrinkage in the internal mold; Step 300, pouring concrete between the external mold and the internal mold to form the tower tube; fluid is injected into the sealed cabin while concrete is poured, so that first acting force that the sealed cabin acts on the inner surface of the internal mold is no less than second acting force that concrete acts on the external surface of the internal mold. The tower tube is constructed by the tower tube pouring construction method. The invention aims at disclosing a tower tube pouring construction method and a tower tube, thereby solving a technical problem that the tower tube pouring construction cost is relatively high in a prior art.

The invention provides a drilling fluid circulation system for reducing the drilling trip-out suction pressure. The drilling fluid circulation system comprises a drilling rig assembly, a normal drilling circulation channel and a trip-out and trip-in circulation channel. The drilling rig assembly includes a drill string and a drilling bit. The normal drilling circulation channel includes a first rotating valve, a solid phase control device, a mud tank and a mud pump which communicate one another in sequence. The trip-out and trip-in circulation channel includes a second rotating valve, a trip-out and trip-in pump, a trip-out and trip-in mud tank and a third rotating valve which communicate one another in sequence. The method for reducing the drilling trip-out suction pressure through the drilling fluid circulation system includes the steps that before trip out, the first rotating valve and mud pump are closed, the second rotating valve and the third rotating valve are opened, the displacement of the trip-out and trip-in pump is determined according to relevant parameters, and the trip-out and trip-in pump is started to enable the displacement to reach a displacement value of the trip-out and trip-in pump. According to the technical scheme, the drilling fluid circulation system has the beneficial effects that a trip-out and trip-in mud circulation loop is added in a conventional mud circulation loop, and the mud circulation loop is used during trip out and trip in for reducing the trip-out and trip-in suction pressure.

The invention discloses a noise reduction method after histogram equalization of a low-illumination image. The method takes a plurality of minimum brightness values as a reserved set and traverses all pixels, and comprises the following three situations of 1: for the pixel brightness values belonging to the reserved set, keeping the pixel brightness values unchanged; 2, for the pixel brightness values which do not belong to the reserved set, if the brightness values of eight pixels in a 5*5 area around the pixel belong to the reserved set, valuing the pixel brightness in the reserved set; and 3, for other situations, according to the pixel characteristics in the 5*5 area around the pixel, adaptively constructing a 5*5 filtering template, and calculating the brightness value of the pixel by using the filtering template. Compared with the noise reduction via a Gaussian low-pass filter, the method has the advantage that the information in a dark environment can be visually identified better.

The invention provides a nozzle throat section with annular reinforcing ribs. The annular reinforcing ribs are arranged outside an inner cylinder body in the throat section, the overall rigidity of the throat section is enhanced, and the risk of instability of the throat section is reduced. Two or more annular reinforcing ribs are distributed on the outer circumferential surface of the inner cylinder body in the axial direction, and two or more axial strip-shaped grooves are distributed in the outer circumferential surface of the inner cylinder body in the circumferential direction to serve ascold water tanks; and the cold water tanks penetrate through the axial direction of the inner cylinder body to form a cooling water channel, a connecting flange is provided with a water inlet channeland a water outlet channel which are in communication with the cooling water channel; annular grooves which are in one-to-one correspondence with the annular reinforcing ribs are distributed on the inner circumferential surface of an outer cylinder body in the axial direction, when the outer cylinder body sleeves the outer portion of the inner cylinder body, the annular reinforcing ribs are located in the annular grooves corresponding to the outer cylinder body; and the outer cylinder body is fixedly connected with the annular reinforcing ribs, and the nozzle throat section of the structure form can adapt to the use requirements of high mach numbers.

The invention relates to a clotrimazole live lactobacillus composition and a preparation method thereof, and belongs to the technical field of pharmaceutical preparations. The clotrimazole live lactobacillus vaginal tablet disclosed by the invention comprises 500mg of clotrimazole; 1mg of lactobacillus powder; 20mg to 30mg of lactic acid; 8-12mg of calcium lactate; 6-12mg of starch; 200-300mg of cellulose lactose C80; 66mg to 180mg of eudragit-RL30D; 225mg to 314mg of lactose; 170mg to 225mg of microcrystalline cellulose; 70mg of crospovidone; 20mg of colloidal silicon dioxide; and 10 mg of magnesium stearate. The invention provides the clotrimazole live lactobacillus vaginal tablet.

The invention discloses a method for running an interrupt service in a user space. The method comprises the following steps of: 1, sending interrupt information to be registered of the user space to a kernel space; 2, registering the interrupt information to be registered in the kernel space, initializing a communication system between the kernel space and the user space, and storing an entry address of an interrupt service program corresponding to the interrupt information to be registered into the user space; 3, circularly waiting for an interrupt inform in the user space; 4, when the interrupt comes, sending the interrupt inform by the kernel space to the user space through the communication system; 5, running the corresponding interrupt service program through the entry address of theinterrupt service program in the user space; and 6, finishing running of the interrupt service program and returning to the step 3. By the method, an interrupt articulation process and the interrupt service program can be run in the user space, so that an interrupt service program writer does not need to know a kernel mechanism of an operating system well, and the writing difficulty of the interrupt service program is reduced.

The invention discloses an Al-Cu-Li alloy deformation heat treatment process based on particle stimulated nucleation, and belongs to the technical field of aerospace component manufacturing. Accordingto the process, an Al-Cu-Li alloy can be remarkably promoted to be subject to thermal deformation and recrystallization to obtain an isometric fine crystal structure. The process comprises the following steps of carrying out homogenizing annealing on an alloy ingot to obtain a uniformly-distributed micron-scale T1 phase (Al2CuLi), then performing hot-pressing deformation, and annealing at a hightemperature. According to the process, the high-stability recrystallization structure in the Al-Cu-Li alloy can be obtained controllably, the recrystallization degree is high, the fine crystal effectis obvious, the structure is stable, the alloy texture can be remarkably weakened, the alloy anisotropy is reduced, and therefore the multi-directional bearing performance and the corrosion resistanceof the alloy are improved, the comprehensive service performance of the Al-Cu-Li alloy can be greatly improved, the application range of the Al-Cu-Li alloy in aerospace components can be extended, and the competitiveness of products such as materials / components can be improved

The invention provides an anti-slide pile design optimization method based on the instability risk of a slope system. The method comprises the steps that statistical characteristics of uncertainty parameters of a slope are determined; a slope stability analysis model is established; the related failure probability of the slope in an initial state is calculated, and a regional failure probability graph is drawn; a slope anti-slide pile design scheme is initially set according to the regional failure probability graph; anti-slide torque is calculated; the related failure probability of the slope of the scheme after reinforcement is calculated, and reinforcement effects of different schemes are evaluated; the scheme with the lowest instability risk is selected as an optimal anti-slide pile design scheme; whether the optimal scheme in the step 7 meets the target failure probability is judged, and if not, the steps 4-8 are repeated till reliability is met; an alternative design space is refined; and economy is considered, and the design scheme meeting the target failure probability and with the lowest cost is found. Through the method, the instability risk of the slope system can be effectively lowered, the method is more economical, and the influence of multiple failure modes on the reinforcement scheme can be reasonably considered.

Provided is a photovoltaic parallel inverter system having shared capacitor topology. The system comprises a plurality of paths of photovoltaic grid-connected inverter units. Each path of photovoltaic grid-connected inverter unit is connected in series with an independent AC output LC filter unit to form a branch; the plurality of branches are connected in parallel, and the output ends thereof are connected with a shared capacitor unit; the output end of the shared capacitor unit is connected with a power grid; and the LC filter output by each branch and a filter capacitor of the shared capacitor unit and an equivalent inductor at the power grid side form an LCCL filter structure. Since the capacitor of the shared capacitor unit is connected in parallel with the filter capacitor of each branch, the system, on the whole, is still an LCL filter structure; the product of the inductance and capacitance of the AC output LC filter unit is equal to the product of the inductance at the power grid side and the capacitance of the shared capacitor unit, that is, the product of the inductance and the capacitance at the inverter side is equal to the product of the inductance and the capacitance at the power grid side; and the resonant frequency of the LCL filter structure does not change with the number of the branches.

The invention relates to a water-based anticorrosive paint. The paint is prepared from the following raw materials in parts by weight: 40 to 70 parts of water-based composite emulsion, 10 to 30 parts of pigment filler, 5 to 10 parts of multifunctional additive, 0.1 to 1 part of thickening agent, 1 to 10 parts of curing agent and 0 to 10 parts of water. According to the scheme, the multifunctional additive provides multiple purposes such as anti-corrosion performance, dispersing performance and anti-settling performance for the coating, and the unstable risk caused by too many types of additives is reduced; according to the scheme, the water-based paint prepared by taking water as a dispersion medium meets the environment-friendly requirement; an auxiliary dispersing agent in the auxiliary agent provides a stable dispersion system for the modified graphene on one hand, is also a dispersing agent of a coating system on the other hand, and can be firmly adsorbed through electrostatic interaction with pigment and filler ions, so that the anti-settling performance of the water-based coating is improved; and the modified graphene is good in dispersity in the coating, the film forming uniformity is greatly improved, the coating has good corrosion resistance, and the coating is high in adhesive force and not prone to cracking or stripping after being sprayed.