89 results about "Control principle" patented technology

The invention relates to the technical field of industrial process automation control, and discloses an intelligent adjusting method for an industrial waste liquid low-temperature evaporation process, which comprises the following steps of: superposing pressure step test excitation to a vacuum adjusting valve, synchronously acquiring temperature response data flow, calculating absolute error integral and SIAE and reply time characteristics of a response curve, and calculating the temperature response data flow according to the absolute error integral and SIAE and reply time characteristics of the response curve; substituting into an inverse model to solve an equivalent process gain and a time constant of the controlled object; based on the internal model control principle, PID controller parameters are dynamically calculated and updated through the calculated gain and the time constant, a control law is reconstructed to generate an execution instruction, and the problem of control divergence of a non-linear time-varying object under model mismatch is solved through active energy feature identification and a pole assignment mechanism; decoupling control and self-adaptive adjustment of fluid viscosity sudden change and equipment scaling are achieved, and the stability and control precision of the system are improved.

The invention discloses a high-speed level flight ten-rotor unmanned aerial vehicle. The high-speed level flight ten-rotor unmanned aerial vehicle comprises a flight control device, a fuselage frame, a plurality of rotor assemblies on the two sides of the fuselage frame and a tail thrust assembly. The motor bases of the rotor assemblies on the two sides have a certain inclination angle, and can drive the propellers to generate thrust in the vertical direction and the lateral direction when the propellers work. A tail thrust motor of the tail thrust assembly drives a tail thrust propeller to generate thrust. Through the design of the rotor wing assembly and the tail thrust assembly, rapid flight can be achieved, and forward flight of the fuselage under the horizontal state is kept; meanwhile, the unmanned aerial vehicle adopts a modular design, multiple unmanned aerial vehicles can be combined, and the carrying capacity is improved. In the control aspect, pitching, rolling, yawing, up-and-down movement and front-and-back movement of the unmanned aerial vehicle are controlled through different motor differential speeds based on a longitudinal eight-rotor structure, and height position and attitude control of the unmanned aerial vehicle can be achieved in combination with the PID control principle. Compared with a traditional unmanned aerial vehicle, the flight performance and the carrying capacity of the unmanned aerial vehicle are remarkably improved.

The utility model provides a computer interlocking practical training function distributed control device, and relates to the field of railway signal system practical training. The computer interlocking practical training function distributed control device comprises a control host, a point switch switching control unit and a signal machine switching control unit. The switch machine switching control unit is used for receiving a control instruction sent by the control host or acquiring first switching control information of a user on at least one first switching control button of the switch machine switching control unit, so that at least one first target relay in the switch machine acts; the annunciator switching control unit is used for enabling at least one second target relay in the annunciator to act, so that each student can observe the control process of the annunciator and the switch machine, and can master the control principle of the computer interlocking system cabinet by observing the action state of the equipment and learning and analyzing the action program of the equipment; the learning effect is improved, and the practical teaching effect is ensured.

The application discloses a light / sound early warning method based on a vehicle distance, an intelligent cockpit and a vehicle thereof, and belongs to the technical field of intelligent control, and comprises the following steps: acquiring distance information of a host vehicle and a preceding vehicle through a vehicle-mounted sensor; detecting a distance change value of the host vehicle and the preceding vehicle in real time, generating a following vehicle strategy based on a PID control principle, comparing the distance change value with a preset threshold value, and judging whether the current distance change value reaches the preset threshold value; if the current distance change value reaches the preset threshold value, a light warning signal is sent through a vehicle-mounted light system, and a sound prompt signal is sent through an in-vehicle sound system. The early warning method provided by the application is combined with light reminding and sound prompting, when the system detects that the distance from the preceding vehicle is too close or there is a dangerous behavior, warning information is timely transmitted to the driver through flashing warning lights and sound prompting, so that the driver takes corresponding measures to ensure driving safety.

The invention discloses an intelligent mine refrigeration system, which relates to the technical field of mine refrigeration and comprises a regional thermal control unit, a state sensing module and a signal control distribution module, the regional thermal control unit is used for refrigerating by using a solid-state heat flow regulation and control principle, the state sensing module is used for detecting the running state of a heat source module, and the signal control distribution module is used for communicating local cooling node signals of each region to facilitate power and signal transmission; the regional thermal control unit comprises local cooling nodes, dynamic electric distribution regulation modules and a refrigeration regulation and control unit, the state sensing module comprises a thermal intensity acquisition unit, a hot area contour modeling module and a comparison judgment module, and the signal control distribution module is in signal communication with the dynamic electric distribution regulation modules of the local cooling nodes. And the dynamic power distribution regulation module and the refrigeration regulation and control unit are in signal communication with the comparison judgment module. The system has the characteristic of distributed regulation and control.

The novel anti-blocking steel bin comprises a bin body 1, a nitrogen pipe 3, two groups of air cannon bodies 4, an electromagnetic valve 5 and a local control box 6, a discharge port 2 is arranged at the bottom of the bin body 1, the two groups of air cannon bodies 4 are respectively mounted on two sides below the bin body 1, and each air cannon body 4 is provided with an air inlet 7, an exhaust port 8 and a blowing port 9. Blowing ports 9 of the air cannon bodies 4 are communicated with the interior of the bin body 1, air inlets 7 of the air cannon bodies 4 are connected with the nitrogen pipe 3, the two sets of electromagnetic valves 5 are arranged and installed at exhaust ports 8 of the two sets of air cannon bodies 4 respectively, and the local control box 6 is electrically connected with the two sets of electromagnetic valves 5. The circulating blowing device has the advantages that the circulating blowing effect is achieved by utilizing the double-time-relay control principle, blowing is carried out under the condition that material blockage occurs in the bin body, meanwhile, the rotating plate is pushed through the air pressure of the air cannon, the discharging opening is dredged, and stable material circulation is guaranteed.

The crawler-type photovoltaic power generation panel cleaning robot comprises a metal plate machine body, a machine body protection shell is installed on the outer surface of the metal plate machine body, rolling brush bodies are installed at the two ends of the metal plate machine body correspondingly, a crawler structure is installed at the bottom of the metal plate machine body, and a heat insulation cover is installed on the surface of the upper end of the metal plate machine body; and a signal receiving end, an antenna main body and an RTK receiving end are respectively mounted on the surface of the upper end of the heat shield. A belt wheel is driven by a brushless motor, the direction of the belt wheel is controlled through the differential control principle, plastic fiber brush heads are arranged at the front end and the rear end, dust is adsorbed by static electricity generated by high-speed friction, dust deposited on a photovoltaic power generation panel is cleaned in a mode of physically removing redundant sundries, and the device has the advantages of being high in automation degree and convenient to control. The whole device is flexible in steering control, high in maneuverability and high in dust removal and cleaning efficiency.

The invention relates to the technical field of train side door spraying and sealing, in particular to a polyurethane spraying device based on an automatic identification control principle, which is provided with a bearing platform, a visual identification assembly, a linear telescopic piece, a spray gun and a controller, the inclination angle of the linear telescopic piece is suitable for enabling the horizontal component velocity to be matched with the train traveling speed during stretching, the highest point of the telescopic end of the linear telescopic piece is suitable for being matched with the height of the upper edge of the side door, and the spray gun is installed at the telescopic end of the linear telescopic piece. During spraying, the whole device is placed on one side of the advancing direction of the train, and the controller controls the right spray gun to sequentially complete spraying of the upper edge and the right edge of the side door according to a detection signal of the visual recognition assembly and controls the left spray gun to sequentially complete spraying of the left edge and the lower edge of the side door. Spraying control of the device is achieved through cooperation of the visual recognition assembly and the controller, and the spraying difficulty is small; meanwhile, manual operation is not needed, and labor force is saved.

The invention relates to a model prediction control method and device for dynamically adjusting a prediction range. The method comprises the following steps: performing one-beat delay compensation on a motor system according to sampled data, and adjusting a prediction range of the one-beat delay compensation according to an actual switching frequency of the motor system at the current moment and a preset target switching frequency; calculating a reference voltage vector of the motor system based on a current dead-beat control principle, and performing space vector modulation on the reference voltage vector based on a volt-second balance principle to obtain a plurality of candidate voltage vector sequences; and selecting the candidate voltage vector sequence with the minimum harmonic current effective value as an optimal voltage vector sequence, and controlling the action of the motor system at the future moment according to the optimal voltage vector sequence. According to the method provided by the invention, the current harmonic is relatively small by adjusting the prediction range, limiting the switching frequency and screening the voltage vector sequence, so that the steady-state performance of the motor system is improved.

The invention discloses a multi-point distributed optical storage cooperative control method and device and a storage medium, and relates to the technical field of optical storage cooperative control, and the method comprises the steps: building an active anti-interference control model based on a virtual synchronous generator control principle according to the device parameters of each distributed optical storage system; constructing a voltage cooperative control model based on the Ressel invariance theorem; constructing an energy storage cooperative control model based on the energy storage charge state time sequence dependency relationship; a state space sharing strategy is utilized to associate the voltage cooperative control model and the energy storage cooperative control model to construct a cooperative control model; outputting an active disturbance rejection control strategy based on the active disturbance rejection control model; based on the disturbance elimination result, judging whether to call a cooperative control model to output a cooperative control strategy according to the power grid real-time operation data; and executing distributed optical storage control according to the active disturbance rejection control strategy or / and the cooperative control strategy. The method has the beneficial effect that the stability and adaptability of cooperative control of the distributed optical storage system are improved.

The application relates to a safe and stable control power distribution method and device of a two-end modified three-end parallel DC line. In the safe and stable control power distribution process of the two-end modified three-end parallel DC line, the power sending and receiving mode of the three-end converter station is determined according to the power sending capacity of the newly-added sending-end converter station and the power consumption capacity of the original two-end converter station, and the power coordination control principle and the power distribution implementation method of the power promotion and reduction function actions of each station in the power sending and receiving mode of 'one-end power sending and two-end power receiving' and 'two-end power sending and one-end power receiving' are respectively designed, so that the power distribution of the two receiving ends in the 'one-end power sending and two-end power receiving' mode can preferentially meet the power receiving of the original two-end converter station inverter station, and the power distribution of the two sending ends in the 'two-end power sending and one-end power receiving' mode can preferentially meet the power sending of the newly-built station, and the efficiency and accuracy of the power distribution of the parallel three-end DC project are improved.

The utility model discloses a compression device for an undercarriage buffer of an unmanned aerial vehicle, which relates to the technical field of unmanned aerial vehicles and comprises a pair of top fixing force arms, a pair of bottom fixing force arms and a pair of bottom fixing force arms, one end of each bottom fixing force arm is connected with the lower end of the buffer; the telescopic pull rod is arranged between the pair of top fixed force arms and the pair of bottom fixed force arms; the jack is arranged between the other ends of the pair of top fixed force arms and the other ends of the pair of bottom fixed force arms, and when the jack extends, one ends of the pair of top fixed force arms and one ends of the pair of bottom fixed force arms move oppositely; the compression device conforms to the mechanical control principle, and is easy and convenient to operate, reliable in function, stable in quality, lighter in weight, smaller in size, higher in portability and more flexible in application scene.

The utility model discloses an external reversing valve which comprises an upper valve body. The reversing sliding block is arranged in a cavity of the upper valve body in a sliding mode. The electromagnetic valve and the relay are connected with the side part of the upper valve body; the reversing pistons are arranged in pairs and connected with the two sides of the reversing sliding block respectively. The lower valve body is connected with the upper valve body, and an oil inlet channel and an oil return channel which are communicated with an excavator oil cylinder are formed in the lower valve body. According to the reversing valve, due to the oil liquid reversing control principle and the innovative structural arrangement of all parts, the sensitivity of the reversing piston in the reversing valve to oil liquid impurities is reduced, the situation that the reversing piston is stuck is not prone to occurring, the service life of the whole reversing valve is prolonged, the reliability of the whole reversing valve is improved, and crushing operation is guaranteed.

The invention discloses a self-adaptive control method and system for an electric shovel working device based on danger situation assessment, and belongs to the technical field of electric shovel collision avoidance. According to the method, a multi-layer working device operation danger situation comprehensive evaluation system is established, multi-source information such as the operation speed, the current position and the operation intention of a driver is comprehensively considered, and a danger situation evaluation problem is regarded as a mixed multi-criterion decision problem. And quantitative evaluation is carried out by using a TTC risk evaluation model, and anti-collision pre-decision making is carried out based on a feedforward control principle. Meanwhile, a decision evaluation and correction mechanism is introduced, and a control strategy is dynamically judged and corrected by calculating a danger situation change rate, so that a reliable closed loop is formed. The defects that in the prior art, single position information is relied on, the braking strategy is stiff, and state feedback is lacked are overcome, smooth and self-adaptive anti-collision control is achieved, equipment impact and abrasion are effectively reduced, the reliability of a control system is improved, and the service life of equipment is prolonged.

1. The name of the design product: airplane horizontal stabilizer control intelligent teaching equipment. 2. The use of the design product: for the control principle teaching of airplane horizontal stabilizer in airplane maintenance training course. 3. The design points of the design product: in shape. 4. The picture or photo that can best show the design points: perspective view. 5. The bottom of the design product is the part that is not easy to see or cannot be seen during use, so the top view is omitted.

This invention discloses a method and system for on-site simulated interlocking testing of railway signals, relating to the field of interlocking testing technology. The method includes: generating a configuration table of individual equipment simulation test data based on the equipment layout diagram of the test station; compiling a template file for generating individual equipment test steps based on the configuration table and the control principle diagram of the test station equipment; generating different individual equipment test tables based on the configuration table and the template file; analyzing all conditions requiring inspection in the template file based on the computer interlocking status, button information, and relay action information in the relay assembly rack to determine the interlocking test items; and managing the current test data of the station to be tested. This invention enables monitoring from operation to status during the simulation test, improving the completeness and accuracy of the simulation test.

The invention relates to the technical field of gas turbine control, and discloses a gas turbine purging system fault diagnosis method and system. Aiming at the problems of high false alarm rate, lack of systematic classification, difficulty in finding potential faults in time and no combination of dynamic characteristics of a combustion mode and the like due to the fact that fault judgment depends on a single sensor signal in the prior art, the method comprises the following four steps of: firstly, determining operation state characterization according to an operation state of a purging valve group; determining faults through random combination characterization and constructing a fault library; secondly, analyzing fault types based on system control logic, and determining each fault type in a fault library in combination with a control logic diagram to obtain a fault type library; thirdly, determining a processing scheme according to the fault type reason; and finally, fault types are diagnosed according to the fault type library, and maintenance is performed according to a corresponding scheme. According to the method, systematization and precision of fault diagnosis are achieved, potential fault scenes are comprehensively covered, a fault triggering mechanism is defined from the control principle level, a complete closed loop from recognition to processing is formed, the accuracy and efficiency of fault diagnosis are effectively improved, dynamic characteristics of a combustion mode are adapted, and powerful technical support is provided for safe and stable operation of the gas turbine.

The application provides a wind storage power station frequency modulation control method and device, wherein the wind storage power station frequency modulation control method comprises the following steps: obtaining power grid frequency data of a power grid connected to a wind storage power station, first group frequency modulation data of each energy storage unit in an energy storage device, and second group frequency modulation data of each wind turbine generator set in a plurality of wind turbine generator sets; determining first power released by the wind storage power station by using a droop control principle based on the power grid frequency data; further determining second power released by the energy storage device; and determining power reference values of each wind turbine generator set in the wind storage power station based on the first power released by the wind storage power station, the second power released by the energy storage device, and the second group frequency modulation data of each wind turbine generator set, so as to control the power grid frequency of the wind storage power station. The application can solve the technical problem of how to coordinate the active power released by each wind turbine generator set in the wind storage power station and the active power released by the energy storage device, and realize short-term stability of the power grid frequency connected to the wind storage power station.

According to the method and device for determining the theoretical power of the wind turbine generator set, a set theoretical power calculation scheme integrating multiple theoretical power calculation algorithms is provided from the power generation control principle of the wind turbine generator set, the method does not depend on a traditional scheme based on wind speed prediction, and the method and device have the advantages of being high in precision and accurate in calculation. The method for determining the theoretical power of the wind turbine generator comprises the steps that the current generator rotating speed and the variable pitch angle of the wind turbine generator are obtained; according to the rotating speed and the variable pitch angle of the generator, selecting a target determination curve matched with the rotating speed and the variable pitch angle of the generator from a plurality of pre-calibrated theoretical power determination curves, and determining theoretical power based on the target determination curve; wherein the pre-calibrated determination curve of the various theoretical powers is obtained through calibration according to historical operation data of the wind turbine generator.

This application discloses a magnetically controlled tripping device for a circuit breaker and its usage method. The tripping device includes a lever, a bracket, an iron core operating rod, and a magnetic control assembly. One end of the lever is the tripping action end, the middle of the lever is rotatably mounted on the bracket, and the other end of the lever is movably connected to the iron core operating rod. The iron core operating rod pries the lever and limits it within the magnetic control assembly. The usage method employs the aforementioned tripping device; when an external sensing device detects that the current value i or the current rise rate di / dt in the main circuit exceeds a predetermined value, the magnetic control assembly causes the internal iron core operating rod to rise, driving the tripping action end of the lever to descend, thus performing the tripping operation. The beneficial effects of this application are: when an overload or short-circuit current is detected in the main circuit, the device can respond quickly, with a fast tripping speed, protecting equipment and personnel safety; utilizing the magnetic control principle combined with the lever principle, it has a simple structure, is easy to install, has few mechanical parts, low wear, long service life, and high reliability.

The application provides a conflict elimination model and method for a weaving area of a quick exit ramp and a connection road section of an intersection. According to the optimization theory and the rolling horizon control principle, the conflict elimination model adopts a linear programming expression form, and takes the maximum average driving speed of all vehicles as an optimization target. Constraint conditions are set in the light of traffic safety and efficiency, including vehicle weaving decision constraints, safety distance constraints and vehicle dynamics constraints. The weaving vehicle is separated in time and space, the passing right of the vehicle in the area is orderly controlled, the purpose of zero conflict of the vehicle driving is achieved in the model control range, and the traffic passing efficiency of the road section is improved to a certain extent.

The utility model discloses a hydraulic control system of a hydraulic slag hopper. The hydraulic control system comprises an integrated valve block, a two-way hydraulic motor, a driving piece used for driving the two-way hydraulic motor to work, an oil suction one-way valve, a first pressure oil way and a second pressure oil way, wherein the oil suction one-way valve, the first pressure oil way and the second pressure oil way are installed on the two-way hydraulic motor. The integrated valve block is arranged on the slag hopper oil tank, two oil ports of the bidirectional hydraulic motor are communicated with two oil inlets of the integrated valve block through hydraulic pipelines respectively, the two oil ports of the bidirectional hydraulic motor are each connected with an oil suction one-way valve in parallel, and the oil suction one-way valves are connected to the first pressure oil way and the second pressure oil way respectively. The driving part rotates forwards and backwards to drive the bidirectional hydraulic motor to rotate forwards and backwards so as to switch hydraulic oil flowing paths and supply oil to the two oil inlets of the integrated valve block, and the telescopic action of the hydraulic cylinder is controlled. The system is simple in control principle and control mode and convenient to overhaul, control is achieved through the integrated valve block, the module size is small, and disassembly, assembly, repair and maintenance are convenient and fast.

This application discloses a control testing method, apparatus, system, and program product for construction machinery. Relating to the field of construction machinery technology, the method includes: acquiring electrical signals generated from operating components for controlling actuators, and matching the electrical signals with corresponding operating actions to form a corresponding control mapping relationship; generating control signals based on the control mapping relationship to drive the actuator using either a host computer or a physical input device. By matching and analyzing the electrical signals of the operating components and establishing control mapping relationships, a structured expression of the control principle of construction machinery can be achieved, and control signals can be generated based on the control mapping relationship, realizing integrated processing of control principle detection and control testing, improving testing efficiency and consistency.

The invention discloses a shallow-buried large-span roadway digging and anchoring integrated parallel operation method which comprises the following steps: S1, analyzing a control principle of a shallow-buried large-section roadway through theoretical analysis and numerical calculation; s2, analyzing surrounding rock stability influence factors under different support major cycle step pitches; s3, the parallel operation distance of a large cycle is simulated and determined according to the analysis results of the step 1 and the step 2, the forward tunneling distance of the tunneling and anchoring all-in-one machine after primary supporting is determined, and secondary supporting of the anchor rod reversed loader is started; s4, carrying out first support according to the distance determined in the step 3: constructing part of anchor rods of the roof by using a digging and anchoring all-in-one machine; and S5, follow-up secondary supporting is conducted, specifically, all the anchor rods and the anchor cables are completed through construction of the hydraulic anchor rod trolley, and therefore one cycle operation is completed. According to the method, advancing and retreating of the heading machine and moving of the roof bolter are omitted, the unsupported roof time is greatly shortened, and temporary supporting and permanent supporting can be conducted on the roadway in time.

This invention discloses an energy management method and system, relating to the field of new energy vehicle technology. Based on the water tank control principle used in existing technologies, it introduces a battery temperature rise rate coefficient. Different values ​​are calibrated for the temperature rise rate at different times within a set target operating time period, enabling energy distribution management and control of the load. This allows the battery to achieve optimal charging and discharging performance, ensuring vehicle power requirements, while effectively controlling battery temperature rise, improving battery life, avoiding high-temperature battery operation, and enhancing vehicle safety. SOP (Start of Production), which allows for a linear slope smooth decrease when the allowable charging and discharging power limit decreases, can act as a damping mechanism, ensuring smooth vehicle power output. Conversely, it allows for a step increase when the allowable charging and discharging power limit increases, enabling the fastest recovery of power and improving vehicle acceleration performance.

The embodiment of the invention provides a power supply controller of a multi-phase power supply and a control method. The power supply controller comprises a pulse enhancement unit, a transient monitoring unit, a signal selection unit and a multi-phase control unit, the transient monitoring unit is used for monitoring the voltage output state of the multi-phase power supply; the multi-phase control unit is used for providing PWM signals with fixed phase difference based on a constant on-time control principle in a steady state, and providing the PWM signals to a power switch of the multi-phase power supply through the signal selection unit, so that the power switch can perform switching state switching according to the PWM signals to supply power; the pulse enhancement unit is used for providing enhanced pulse signals with the phase difference according to the preset pulse width and number when the transient monitoring unit monitors a serious transient event, and providing the enhanced pulse signals to a power switch of the multi-phase power supply through the signal selection unit; therefore, the power switch performs switch state switching according to the enhanced pulse signal so as to respond to the serious transient event.

This application discloses a vehicle power take-off torque control method, device, equipment, and storage medium, relating to the field of new energy commercial vehicle technology. The method includes: acquiring a rotational speed value, a proportional-integral coefficient, and a proportional-speed difference; calculating a proportional control torque and an integral control torque based on the rotational speed value, the proportional-integral coefficient, and the proportional-speed difference; and adjusting the vehicle's power take-off torque based on the rotational speed value, the proportional control torque, and the integral control torque to maintain constant speed driving. This application utilizes the proportional-integral control principle to calculate the proportional control torque and integral control torque. The operation is simple and saves calibration effort in practical applications, thereby limiting overshoot and precisely adjusting the vehicle's power take-off torque. This achieves constant speed control of the motor in driving power take-off mode, automatically adapting to road conditions and load changes. Furthermore, the driver does not need to manually adjust the accelerator and brake pedals, effectively reducing the driver's workload and significantly improving vehicle performance and work efficiency.

This invention belongs to the field of coking dry quenching production technology, specifically based on an intelligent control method for the temperature of circulating gas after the heat pipe heat exchanger in dry quenching. This method abandons the traditional method of relying on temperature detection, audible and visual alarms, and manual control of the amount of demineralized water entering the heat pipe heat exchanger. By setting a circulating gas temperature detection point after the heat pipe heat exchanger, a demineralized water flow detection point at the point of entry into the heat pipe heat exchanger, and a demineralized water flow regulating valve, a cascade regulation loop is constructed based on the PID control principle. The circulating gas temperature after the heat pipe heat exchanger is used as the main regulating parameter, and the demineralized water flow rate entering the heat pipe heat exchanger is used as the secondary regulating parameter. This achieves automatic and precise control of the demineralized water flow rate entering the heat pipe heat exchanger, effectively improving the stability of the circulating gas temperature after the heat pipe heat exchanger, reducing corrosion of pipelines and the inner wall of the dry quenching furnace, preventing tube rupture accidents, improving the safety of the production process, optimizing heat exchange efficiency, saving labor costs, and achieving a high level of automation in dry quenching production.

The invention discloses a fault detection method, a fault detection circuit and electronic equipment. The fault detection method comprises the following steps: acquiring an alternating current input characteristic parameter and an inverter output characteristic parameter of a bidirectional inverter circuit; detecting whether a first error value between the alternating current input characteristic parameter and the inversion output characteristic parameter is smaller than a first threshold value or not; if the first error value is smaller than a first threshold value, disturbance adjustment is carried out on the inversion output characteristic parameters; detecting whether a second error value between the alternating current input characteristic parameter after disturbance adjustment and the inversion output characteristic parameter is smaller than a second threshold value or not; if the second error value is smaller than the second threshold value, fault alarm is triggered. By means of the mode, the fault detection method can still be effectively achieved even when the alternating current input switch is normal, by using a software algorithm, hardware cost is not increased, the control principle is simple, chip resources are not occupied, and engineering implementation is easy.

The invention discloses a semiconductor defect detection ultrasonic microscopic measurement system and method. The system comprises a mechanical structure connection part of the ultrasonic microscopic measurement system, a hardware integration part of the ultrasonic microscopic measurement system, and a control principle part of the ultrasonic microscopic measurement system. The method comprises the following steps: firstly, constructing a high-precision motion control platform to realize stable and accurate scanning positioning; designing and breaking through key technical problems such as excitation of high-frequency ultrasonic pulses and reception and acquisition of echo signals; finally, computer software control and data processing means are combined to complete semiconductor defect detection ultrasonic microscopic measurement system equipment, and a low-cost high-end nondestructive testing instrument with the technical index of 1-500MHz working frequency bandwidth and submicron scanning and imaging precision is realized. And high-resolution precise scanning of the semiconductor device is realized, so that an efficient and reliable technical support is provided for defect detection in a semiconductor manufacturing process.