3594 results about "Damper" patented technology

The invention discloses a pre-twisted damper fatigue life prediction method for an extra-high voltage ground wire, and particularly relates to the technical field of power transmission line vibration prevention. Collecting multi-source vibration and environment data, and constructing a vibration characteristic time sequence; amplitude, frequency and strain energy are extracted based on the multi-frequency vibration response, and a multi-frequency collaborative vibration model is established; obtaining a damper structure and material parameters, establishing a finite element model, coupling the finite element model with a vibration model, and simulating local stress response; a Rainflow counting method and a Miner damage criterion are adopted to construct a fatigue damage factor distribution matrix; predicting the residual fatigue life of the damper based on the damage evolution trend, and evaluating the replacement opportunity; according to the method, accurate fatigue life prediction and optimal replacement strategy recommendation of the pre-twisted damper under complex working conditions can be realized, and the method has high precision, high adaptability and engineering practicability.

The present disclosure relates to a hydraulic damper comprising a main tube, a piston assembly, a base valve assembly, and at least one hydraulic compression stop assembly cooperating with a compression valve assembly, and comprising a pin disposed slidably within the piston rod and biased to project an activating tip towards the compression chamber. Said compression valve assembly comprises at least one deflectable or floating disc covering compression flow passages, and biased by a piston member slidable along said axis and normally abutting a retaining surface, and a pressure chamber having one surface defined by a surface of said piston member abutting said retaining surface, wherein said pin upon sliding inside the piston rod facilitates a flow of the working liquid from the compression chamber into said pressure chamber to increase biasing load on said at least one deflectable or floating disc.

A diagnostic method localizes technical faults in a motion system that includes a base adapted to receive a motion stage for equipment, a machine frame resting on the floor, dampers adapted to support the base, and an active isolation system arranged between the base and the machine frame. The active isolation system and the base form a mechanical system. The active isolation system includes actuators, adapted to impart six degree-of-freedom (DOF) motion to the base in a reference frame, and inertial sensors adapted to provide a six DOF measurement of the base's motion. The method includes: i) applying a control signal for actuating or contributing to the actuation of the actuators of the active isolation system to impart a motion to the base; ii) obtaining, with the inertial sensors, a six DOF measurement of the base's motion relative to a reference point; iii) creating a measured process sensitivity matrix of the mechanical system using the six DOF measurement; and iv) determining, based on the measured process sensitivity matrix, whether all the actuators and sensors of the active isolation system are working as expected and / or whether there is a pivot point impeding the movement of the base.

Low-pressure oil enters an inlet of a proportional overflow valve, the pressure of a low-pressure system is controlled by the proportional overflow valve, pressure oil on the low-pressure side acts on a plunger control cavity of the hydraulic control overflow valve through a pressure stabilizing damper and a one-way valve, and hydraulic pushing force generated by a plunger is transmitted to an overflow valve steel ball through a disc spring; when the force obtained by multiplying the ultrahigh pressure of the inlet of the hydraulic control overflow valve by the action area of the steel ball is equal to the pushing force of the plunger, the steel ball of the overflow valve is opened to start overflowing, and the overflow pressure of the ultrahigh pressure system can be controlled by adjusting the pressure of the proportional overflow valve of the low-pressure system. The external control type ultrahigh-pressure proportional pressure regulating valve can be used for pressure regulation of a hydraulic system with the pressure being 200 MPa or above and can be used as a proportional overflow valve of an ultrahigh-pressure hydraulic system. By arranging a hydraulic loop of two auxiliary oil ports of the external control type ultrahigh pressure proportional pressure regulating valve, the pressure rising one-way proportional regulating function, the pressure unloading function and the pressure rising / falling two-way proportional regulating function of an ultrahigh pressure system can be achieved.

The invention relates to the technical field of mining local fan air duct air volume self-adaptive adjusting equipment, in particular to a mining local fan air duct air volume self-adaptive adjusting device. According to the technical scheme, the self-adaptive adjusting device for the air volume of the air duct of the mining local fan comprises a fan body, a radiator, an installation support, an electric adjusting air door, an air storage bin, the air duct, an environment detection module, an air speed detection module and a control module, the radiator is arranged on one side of the fan body, and the installation support is arranged on the bottom face of the fan body; an electric adjusting air door is arranged on one side of the ventilator main body; the environment sensing module is arranged, triple redundancy design is adopted, when the gas concentration is abnormal, whether the gas concentration is a spontaneous combustion symptom or not can be discriminated in combination with temperature data, or the coal rock collapse risk is pre-judged through the dust concentration change, and the safety interlocking response time is shortened.

The invention relates to the technical field of air door motor control, and discloses an air door motor control method and system based on current detection, and the method comprises the steps: carrying out the single-phase current signal collection of an air door motor system, and obtaining a current change signal in the opening and closing process of an air door; carrying out FFT (Fast Fourier Transform) and wavelet decomposition processing on the current change signal to obtain a current characteristic spectrum component and a time domain characteristic; processing the current characteristic frequency spectrum component and the time domain characteristic to obtain an air door load current characteristic; iterative learning control is executed, and air door rotating speed control parameters are generated; the PWM duty ratio is calculated, and air door motor driving pulses are generated; according to the air door motor control method, a complete air door motor control protection mechanism is established, abnormal conditions such as stalling can be detected and coped with in time, the safety of an air door motor system is improved, and the service life of the air door motor system is prolonged.

The invention discloses a design method of an equivalent simulation component of a wall-type connection metal shear damper, and relates to the field of design methods of anti-seismic components. Comprising the steps that a non-damping structure model without a damper is established, the plane arrangement position of the metal shear damper in a building is determined, the yield bearing capacity of the damper is determined according to the proportion of earthquake shear force shared by the damper in the X direction and the Y direction of the structure, and the yield displacement of the damper is determined according to the design performance target of the damper. And determining the post-yield stiffness ratio of the metal shear damper, establishing a damping structure analysis model with a damper unit and a connecting wall pier unit, calculating the secant stiffness of the metal shear damper, and calculating the stiffness of the metal shear damper connecting the wall pier. According to the design method, the equivalent simulation component of the damper in the construction drawing model can be designed according to the performance parameters of the metal shear damper and the connecting wall pier, and the design method has important significance on correct establishment and equivalent elasticity analysis of the construction drawing model of the damping structure of the metal damper.

The invention discloses a transformer self-adaptive vibration reduction system based on a magnetorheological damper and a multi-mode cooperative control method, which are used for solving the problems of insufficient low-frequency vibration suppression and poor environmental tolerance in the prior art. The vibration reduction system comprises a sensor module, a control unit, an execution mechanism and an energy recovery module. The sensor module monitors vibration signals of a transformer iron core and a winding in real time; the control unit converts the vibration signal into a magnetic field intensity adjusting instruction in real time, and the damping force accurately matches the target demand by actively compensating disturbance and dynamically optimizing parameters; the execution mechanism comprises a dual-channel magnetorheological damper, the energy recovery module comprises a friction nanometer generator TENG and a super capacitor, the output voltage of the TENG is stored in the super capacitor after DC-DC conversion, and energy closed-loop utilization is achieved. The problems that a traditional vibration reduction device is insufficient in low-frequency suppression, prone to corrosion and high in energy consumption are solved through multi-frequency-band vibration suppression, environment self-adaption design and the self-power-supply technology.

A vibration damping device for a head-up display driving module, the device comprising: a power generating unit configured to a first damper having a predetermined thickness based on a shape corresponding to a motor mount to which a motor is fixed and a second damper fitted into an open hole of a damper mount disposed on top of the motor mount; and a power transmission unit configured to transmit power of the motor by rotating a lead screw extended and coupled to a rotating shaft of the motor.

The invention discloses a multi-branch industrial ventilation intelligent regulation and control system and method based on a PLC. According to the system, a closed-loop control network is formed by an infrared sensor, a wind speed sensor, a PLC (Programmable Logic Controller), an air door control cabinet, an electric valve, a frequency converter, a frequency conversion fan and an upper computer. The infrared sensor is responsible for monitoring the running state of each production line in real time. The wind speed sensor is used for detecting the wind speed in the wind pipe and verifying wind quantity balance. The PLC processes all sensor data and outputs a control instruction. On one hand, the opening degree of the electric valve is adjusted through the air door control cabinet, and on the other hand, the rotating speed of the fan is adjusted in real time through the frequency converter. The upper computer is used for system parameter monitoring, threshold setting and data interaction with the manufacturing execution system. According to the system, on-demand adjustment of multi-branch ventilation is achieved through intelligent closed-loop control, the problem of response lag of a traditional control mode is effectively solved, the dust removal efficiency and the energy utilization rate are remarkably improved, and safe and efficient operation of the industrial environment is guaranteed.

The invention relates to a variable dew point control method of an all-air air conditioning system, belongs to the technical field of heating ventilation air conditioners, and solves the technical problems of temperature and humidity coupling in the prior art and difficulty in landing of a chilled water temperature resetting technology. The control method comprises the steps of S1, parameter initialization, S2, system starting and stabilizing, S3, air supply dew point dynamic adjustment and cold water valve control, S4, temperature and air supply amount control and S5, fresh air optimization and air valve control. The water supply temperature is adjusted by dynamically adjusting the air supply dew point and dynamically increasing the temperature of the outlet of the surface air cooler, the energy efficiency of the unit is remarkably improved, and the system is suitable for the chilled water temperature resetting technology and compatible with the application of the medium-temperature water supply technology.

A vibration absorber arrangement (1) is provided, in particular for tall slender structures, comprising a supporting structure (8), an absorber mass (2) which comprises a center of mass (3), and at least one wheel (4, 5) by means of which the absorber mass (2) is movable on a concavely curved rail arrangement (6), which is connected to the supporting structure (8), from a stable central position in two opposite directions, wherein a friction damper device (9) is provided. One wants to be able to adapt such a vibration absorber arrangement in a simple manner to different operating requirements. For this, it is provided that the friction damper device (9) is adjustable between a first state, in which it does not interact with the absorber mass (2) or only dampeningly, and a second state, in which it controlledly brings a movement of the absorber mass (2) to a standstill.

The invention relates to the technical field of automatic focusing control, and discloses a rotary objective switching control method and system, a storage medium and a processor, and the method comprises the following steps: obtaining the actual position of an objective turntable based on a magnetic encoder, carrying out curve planning according to the actual position information, and carrying out the open-loop control of a motor to drive the objective turntable to rotate; and after entering a set error range of the actual position and the target position, ending curve planning and starting closed-loop control, and based on a relation model of deviation weight vectors of the actual position and the theoretical position of the magnetic encoder at the zero point and a motor output weight vector, controlling a motor to output pulses according to deviation so as to realize switching and positioning of the rotary objective lens. According to the scheme, the turntable end magnetic encoder is adopted for positioning, locking is carried out based on a fuzzy control strategy after curve planning is finished, the clamp spring only plays a role of a damper and does not need to be positioned, and the precision requirement of the clamp spring and the equipment manufacturing cost are reduced.

The invention provides a sound transmission device which can transmit clear sound to a user without damaging the user and can be actually used. This sound transmission device (1) is provided with: a transducer (2); a transmission plate (3) that transmits vibration to the bone of the head of a person; a housing (4) that houses the transducer (2); and a ring member (7) that is disposed so as to cover the side surface of the housing (4). Furthermore, the transducer (2) includes a giant magnetostrictive element (21), permanent magnets (22a, 22b) disposed at both ends of the giant magnetostrictive element (21), and a coil (23), and the permanent magnet (22a) disposed at one end is connected to the transmission plate (3). The housing (4) is configured so as to include a housing part (41) that houses the transducer (2), and a counterweight body (42) that is connected to the permanent magnet (22b) disposed at the other end. In addition, the ring member (7) holds the side surface of the housing (4) via the damper member (6).

The utility model relates to the technical field of consultation desks, in particular to a convenient-to-use bank consultation desk which comprises a moving assembly, cavities are formed in the two sides of the interior of the moving assembly, motors are embedded in one ends of the two cavities, and connecting shafts are arranged on the two walls of the interior of the two cavities through bearings. Through cooperation of a damper, a fixing base and universal wheels, the convenience of the consultation desk body in the carrying process is greatly improved during use of the bank consultation desk, the problem that a large amount of manpower is consumed during carrying and moving due to the fact that the weight of the bank consultation desk is large is solved, and therefore the labor intensity of workers is reduced, and the working efficiency is improved. The height of the bank consultation desk body can be adjusted according to the requirements of a user during use of the bank consultation desk through cooperation of a connecting shaft, a motor and a threaded rod, the problem that the bank consultation desk is extremely inconvenient to use when a worker is too tall is solved, and therefore the requirement of the bank consultation desk convenient to use is met.

The invention discloses a combustor safety control system for a negative pressure furnace, relates to the technical field of combustion control of negative pressure furnaces, and aims to solve the technical problems that single closed-loop control response of an existing negative pressure furnace combustor is lagged, and the system stability is poor. According to the system, a double-closed-loop control framework of cooperative work of an inner-layer combustion stability closed loop and an outer-layer negative pressure closed loop is constructed, flame characteristic parameters and the gas / air proportion serve as core control objects of the inner-layer closed loop, the opening degree of a gas proportional valve and the rotating speed of a draught fan are adjusted in real time through a PID algorithm, and the combustion state is kept stable; the outer-layer closed loop dynamically adjusts the opening degree of the hearth baffle valve based on the inner-layer adjusting result so as to maintain the negative pressure within a preset range; when any closed loop is abnormal, the system automatically triggers a cross-closed-loop compensation mechanism, and the other closed loop optimizes self-adjusting parameters in real time to realize dynamic compensation. Through double-closed-loop cooperation and abnormal compensation design, the control response speed and operation safety of the negative pressure furnace combustor are greatly improved, the problem of response lag of single closed-loop control is effectively solved, and the method is suitable for safety control of various industrial negative pressure furnace combustion systems.

The invention discloses a grey wolf algorithm flue gas waste heat control method and system introducing exhaust gas temperature prediction constraint, and the method comprises the steps: firstly building a thermodynamic simulation model of a flue gas waste heat system, collecting the working condition data of a unit in real time, and calibrating the model; under the targets of power supply coal consumption minimization, waste heat recovery rate maximization and the like, an exhaust gas temperature prediction result is used as a dynamic constraint, a grey wolf optimization algorithm is adopted to carry out multi-target optimization on parameters such as the opening degree of a flue gas baffle, the water supply distribution proportion of an economizer and the water flow of an air heater, and multiple regression or a BP neural network model is utilized to predict the exhaust gas temperature. If the predicted value is lower than the safety lower limit, dynamically adjusting the search direction to avoid an infeasible solution; and an optimization result is issued on line through a DCS system, and closed-loop control is realized. Compared with the prior art, on the premise that the safety of the exhaust gas temperature is guaranteed, the waste heat utilization rate is remarkably increased, power supply coal consumption is reduced, the capacity of adapting to different coal qualities and load fluctuations in a self-learning mode is achieved, and the good engineering application prospect is achieved.

Variable Orifice Plate technology represents new physics for measuring fluids accurately over a dynamic range and obsoletes fixed orifice plates. Therefore, a new balancing procedure using an updated correction factor is needed to mitigate and calibrate for field systems effects. Architectures are provided that can leverage correction factor values (CFVs) that are determined from a third party device such as a TAB contractor in order to determine other CFVs for a fluid flow with a variable aperture. The fluid flow device can change state, which changes the area of the variable aperture and, accordingly, the fluid flow profile. Multiple CFVs can be determined from TAB measurements taken while the fluid flow device is in respective different states, while other CFVs for different states can be determined as a function of the known CFVs and associated states or other suitable data such as damper position, aperture area, or the like.

The invention relates to the technical field of mine safety equipment, in particular to a mining intelligent air door locking and air speed sensing control device. According to the technical scheme, the mining intelligent air door locking and wind speed induction control device comprises an air door channel body, multiple sets of locking mechanisms, an air door body, a displacement sensor, a wind speed sensor, an environment detection mechanism, a control unit, an alarm mechanism and a sealing assembly, and the multiple sets of locking mechanisms are arranged on one face of the air door channel body; an air door body is arranged at one end of the locking mechanism, and a displacement sensor is arranged on the surface of one end of the locking mechanism. By adopting the physical locking combination of the electromagnetic bolt mechanism and the dual-redundancy mechanical spring bolt and integrating the pressure sensitive diaphragm to monitor the sudden pressure change of the air duct, the safety redundancy of the locking mechanism is remarkably improved, and under the abnormal working condition, the system can automatically trigger locking and cut off a power source to prevent the air door from being opened unexpectedly, so that the safety of the air door is improved. The stability of a mine ventilation system is ensured.

The invention discloses a laser ablation and parameter optimization system and method for a hemispherical harmonic oscillator. The system comprises a laser, a control system, a frequency difference test module, a vacuum cavity, and an electric rotating base, a working platform, a vibration test clamp, an electric control excitation hammer and a vibration stopping damper which are arranged in the vacuum cavity, the working platform is mounted on the electric rotating base; the vibration stopping damper, the vibration testing clamp and the electrically-controlled excitation hammer are all installed on the working platform. By means of the parameter optimization method of the ablation system, the fitting matching degree is judged according to experimental samples added in real time, and the fitting function is dynamically updated. Laser trimming parameters are determined according to the fitting function, the accuracy of the ablation amount is guaranteed, and the trimming efficiency and convergence are improved. The method is widely suitable for the size of the harmonic oscillator, and provides technical support for engineering development of the high-precision hemispherical harmonic oscillator.

A system for controllably releasing humid air including a washing unit having a housing; a washing drum within the housing; a port defining a first opening operable to intake air from an outside atmosphere into an internal cavity of the washing drum; a vent defining a second opening operable to direct the air to flow out of the internal cavity of the washing drum; and a release pipe with a first end coupled to the vent and a second end terminating on an exterior of the washing unit to enable the air to flow out of the vent to an exterior of the housing. The system also includes a damper positioned within the release pipe operable to open or close the release pipe to release humidity to the outside atmosphere and a processor configured to communicate with an external measurement device and operable to selectively open or close the damper.

The invention relates to a wind turbine blade damping control method, system and device, a storage medium and a program product. The method comprises the following steps: acquiring blade vibration monitoring data; according to the blade vibration monitoring data, using a pre-trained wind turbine blade damping control model to obtain operation prediction data and damping demand data; wherein the pre-trained wind turbine blade damping control model is obtained by training based on a CNN-LSTM neural network; and according to the operation prediction data and the damping demand data, the effective coincident area between two magnetic poles of an electrorheological damper of the wind turbine blade is adjusted, so that the damping of the electrorheological damper is adjusted by changing the magnetic field intensity of the electrorheological damper. The safety and reliability of operation of the wind turbine can be effectively improved.

The invention discloses an energy-saving control system for dust removal equipment. The energy-saving control system comprises production equipment, a suction pipe net, an air door assembly, an air door control module, an air pressure detection device, a suction device and a main control module. The production equipment is provided with a machining area and a workpiece detection module. The suction pipe net is composed of a main pipeline and branch pipelines, and the branch pipelines correspond to all devices and are provided with air door assemblies. The air door control module opens and closes an air door according to the workpiece detection signal; the air pressure detection device monitors the air pressure of the main pipeline, the main control module adjusts the power of the suction device accordingly, and the system achieves on-demand dust removal, accuracy, high efficiency and remarkable energy conservation.

The invention relates to an intelligent temperature control rock heat-water-force-sound-light multi-field coupling disturbance shearing device and a use method of the intelligent temperature control rock heat-water-force-sound-light multi-field coupling disturbance shearing device. A disturbance shearing mechanism composed of a trapezoid pressing rod, a constant damper and a spring is additionally arranged on the driving side of the lower shearing box. When the tangential loading shaft is propelled at a constant speed, the mechanism can convert stable linear displacement into disturbance shear load of periodic loading and unloading, so that engineering power disturbance is simulated. According to the device and the method, periodic shear disturbance is synchronously applied to a rock sample in a high-temperature seepage environment, mechanical response, seepage characteristic change, internal micro-fracture and surface full-field deformation of the rock sample are comprehensively observed, and an advanced test means is provided for researching a catastrophe mechanism of a deep rock mass under the action of multi-field coupling and dynamic disturbance.

The invention belongs to the technical field of bridge wind resistance, and discloses a large-span bridge wind-induced low-frequency torsional vibration control device which is mainly composed of a fixed pulley, a rope, a mass block, a spring and a damper or an actuator. Based on the characteristic that the two sides vertically vibrate in opposite phases during torsional vibration of a bridge girder, mass blocks are transversely and symmetrically arranged on the bridge girder in a stress mode of rope suspension and fixed pulley transmission, so that the mass blocks on the two sides are balanced in self weight in a static state, and the bearing capacity requirement of a spring or an actuator and the engineering cost are greatly reduced. Compared with a low-frequency torsional vibration control traditional passive measure, the strength, the length, the number and the cost of the spring are greatly reduced, and the static deformation of the spring is greatly reduced. Compared with a low-frequency torsional vibration control traditional active measure, the driving force and power consumption requirements of the actuator are greatly reduced, the weight is lighter, and the cost is lower. The device is also suitable for different-frequency torsional vibration control and torsional vibration excitation of other engineering structures, the function is powerful, and the application range is wide.

To provide an air conditioning system enabling an air humidity in a living room to be closer to a target humidity while making an air temperature in a living room close to a target temperature.SOLUTION: A control part in an air conditioning system includes: a temperature conditioning and air quantity control mode for controlling an air quantity of a carrying fan and an aperture of a damper on the basis of a temperature conditioning operation where an air conditioning device conditions an air temperature in a living room so as to have a target temperature; and a humidity conditioning and air quantity control mode for controlling the air quantity of the carrying fan and the aperture of the damper on the basis of a humidity conditioning operation where the air conditioning device conditions an air humidity in the living room so as to have a target humidity. The control part performs control for switching the temperature conditioning and air quantity control mode and the humidity conditioning and air quantity control mode on the basis of a first control capability value set on the basis of temperature difference between the air temperature in the living room and the target temperature and a second control capability value set on the basis of humidity difference between the air humidity in the living room and the target humidity.SELECTED DRAWING: Figure 3

The invention relates to the technical field of catering oil fume emission time sequence accurate cooperative control, in particular to a catering oil fume emission dynamic regulation and control system which comprises a monitoring module for collecting oil fume concentration, environmental parameters and execution mechanism state signals; the dynamic modeling module generates an emission trend predicted value; the response quantification module is combined with the delay parameters to construct a physical dynamic response model; the time sequence compensation module is used for calculating fan lag offset, purification unit advance offset and air valve interlocking offset based on real-time working conditions; the cooperative control module outputs a synchronization instruction carrying an offset parameter, so that the fan speed is increased, and the activation time of the purification unit is aligned with the opening and closing action time of the air valve; the closed-loop correction module extracts an actual response curve of the execution mechanism; and the model updating module compares the theoretical output value and updates the delay parameter when the deviation exceeds the threshold value. Through physical response modeling and a dynamic time sequence compensation mechanism, the problem of time sequence mismatch of cooperative control of the fan, the purification unit and the air valve is solved, the purification efficiency is improved, and invalid energy consumption is reduced.

The invention provides a windshield control method and device with a memory function, and the method comprises the steps: controlling a windshield to move to a first locked-rotor point through time, and enabling the first locked-rotor point to be a positioning point at which a motor stops due to physical blocking when the windshield is driven by the motor to move to a first mechanical limit position; controlling the windshield to unidirectionally move to a target position only along the first direction, and recording the motor operation time T from the first locked-rotor point to the target position; storing the running time T; and when a position calling instruction is received, the windshield is controlled to move to the first locked-rotor point and then runs for the time T in the first direction to reach the target position. The technical scheme of the invention is a solution for realizing the grading controller with the memory function at low cost.

The invention belongs to the technical field of damper testing, and particularly relates to hydraulic damper dynamic and static performance testing equipment and method.The hydraulic damper dynamic and static performance testing equipment comprises a testing machine table, and a vertically-arranged rack is fixedly connected to the testing machine table; the rack is slidably connected with a test assembly. An air cylinder frame and a supporting frame are fixedly connected to the upper end and the lower end of the rack respectively, a hydraulic cylinder is fixedly installed on the air cylinder frame, and a laser displacement sensor is installed on the supporting frame. The testing assembly comprises a sliding seat in sliding connection with the sliding rail, a testing seat is movably connected to the sliding seat, a driving motor is fixedly installed on the sliding seat, and a cam used for driving the testing seat to vibrate in a reciprocating mode is fixedly connected to a rotating shaft of the driving motor; a locking air cylinder is installed on the sliding seat, and a piston rod of the locking air cylinder is fixedly connected with a locking frame. According to the testing assembly, the testing seat, the locking frame, the driving motor, the cam and other structures are arranged, the dynamic performance and the static performance of the hydraulic damper can be tested, and testing data are comprehensive and real.

The invention discloses a silicon steel annealing furnace air-fuel ratio dynamic optimization control method based on multi-mode perception. The method comprises the steps that the oxygen concentration and the carbon monoxide concentration in smoke, the uniformity standard deviation of a hearth temperature field, the high calorific value of fuel gas, the fuel volume flow and the combustion-supporting air volume flow are collected in real time; the current actual air-fuel ratio is calculated according to the flow data; the efficiency index and the state evaluation index of the current combustion system are calculated in real time, dynamic optimization is carried out with the maximum efficiency index and the minimum evaluation index as double targets, and an optimal excess air coefficient set value is solved; the optimal excess air coefficient set value is restrained and compensated; and a combustion-supporting air flow set value is calculated, and a combustion-supporting air door or an adjusting valve is controlled to act after fine adjustment, so that precise control is completed. According to the method, multi-mode sensing is combined with a dynamic optimization algorithm, closed-loop optimization control over the air-fuel ratio is constructed, fine control over the air-fuel ratio is achieved, the response time is shortened, and efficiency and quality are both considered.