309 results about "Work cycle" patented technology

The invention relates to a stern bearing lubrication characteristic analysis method coupled with the influence of three-dimensional vibration of a stern shaft, and the analysis method comprises the steps: S1, inputting global parameters into a bearing lubrication performance and kinetic parameter calculation module and a propulsion shaft system vertical, horizontal and torsional three-dimensional vibration calculation module, and completing the corresponding calculation; s2, obtaining a bearing transfer matrix; s3, obtaining a system transfer matrix; s4, the forced vibration calculation module completes corresponding calculation; s5, a bearing relative position feedback module completes corresponding calculation; and S6, judging whether the calculation of one work cycle is completed or not, and storing and outputting the working characteristic result of the stern shaft-stern bearing in the cycle. By designing a bearing lubrication performance and kinetic parameter calculation module and a propulsion shafting vertical and horizontal torsion three-dimensional vibration calculation module, the vibration and lubrication coupling effect between a stern shaft and a stern bearing is fully considered, and a stern shaft vertical and horizontal torsion three-dimensional vibration and stern bearing lubrication characteristic bidirectional coupling model is established. And a vibration lubrication mutual feedback mechanism under a complex vibration condition is disclosed.

The invention relates to a high and low temperature durability test system for an oil pump. The test system comprises a mold temperature controller assembly, an environment box assembly, an oil pump working cycle assembly, an auxiliary oil tank assembly and a control system. The mold temperature controller assembly can provide medium engine oil with different temperatures, the environmental box assembly can create required high and low temperature environments, the oil pump working circulation assembly realizes flow and pressure adjustment and circulation of oil pumps with different calibers through two independent loops, and the auxiliary oil tank assembly facilitates rapid replacement of test engine oil. And the control system realizes automatic control and parameter monitoring of the whole process. The device can complete various tests such as high-temperature durability, low-temperature durability and high-low temperature cycle durability, has the advantages of low cost, rich test conditions, flexibility in operation, high safety, high adaptability and the like, and effectively improves the research and development test efficiency of the oil pump.

A method for modelling a coating process including a plurality of coating parameters, includes the steps of: dispensing, by the coating process and during K work cycles, a coating on each of K pieces of objects to thereby obtain K pieces of coatings; recording, during each of the K work cycles, coating variable values of p coating parameters at M instances to thereby obtain recording results; and measuring at least one coating property at m locations of each of the K pieces of coatings to thereby obtain measurement results. The method is characterized by the step of determining a digital twin of the coating process on the basis of the recording results and the measurement results. By using results from a large amount of classical quality control measurements together with corresponding coating parameter information, a digital twin of the coating process can be determined through statistical processing of such big data. The digital twin may be used either for automatic adjustment of the coating parameters to obtain an improved coating quality, for prediction of the coating quality right after a work cycle to obtain an improved quality control, or for both.

The invention relates to the technical field of intelligent control and predictive maintenance of heating water heaters, in particular to a wind pressure switch control system and method for a heating water heater. The method comprises the following steps of: extracting a starting pressure curve slope, a steady-state pressure fluctuation frequency spectrum entropy and a shutdown pressure decay time constant by collecting a time sequence pressure signal in a working period of a fan so as to generate a dynamic feature vector; comparing the vector with a preset reference health vector by the system, and resolving the health state confidence and the state deviation drift rate of the system in real time; when the health confidence coefficient is lower than a safety threshold value or the deviation drift rate is too high, the system executes forced safety locking; if the health degree is slightly reduced, the pre-purging time of the fan is actively prolonged as compensation; according to the method, conversion from fault response to predictive maintenance is achieved, early performance degradation symptoms such as fan abrasion and air duct dust deposition can be recognized in advance, post-maintenance is converted into beforehand intervention, and the fault rate and maintenance cost are effectively reduced.

The invention discloses a path planning method and full-automatic carrier tape braiding packaging equipment, and relates to the technical field of automatic packaging. The method comprises the following steps: acquiring an initial position coordinate of a mechanical arm and identifying a target position of a to-be-grabbed semiconductor device; constructing a feasible position set, wherein the feasible position set comprises all candidate positions which can be safely reached and have no collision risk; traversing the set, calculating the distance from the current position to each candidate position, and selecting the nearest position as a next target; removing the data from the set and updating the set; and when the mechanical arm reaches the target position, grabbing is executed, the final position is recorded, then the position is set as the initial position of the next mechanical arm, and the steps are repeated till all tasks are completed or the target position is empty. When the position of the device in the vibration disc changes or a new device capable of being grabbed appears, the path can be automatically re-planned, the grabbing strategy can be automatically adjusted, invalid movement can be reduced, the work period is shortened, and the production efficiency of the full-automatic carrier tape braiding packaging equipment is remarkably improved.

The invention discloses a combined air inlet two-stage combustion six-stroke engine, and relates to the field of power energy. In order to overcome the defects that in the prior art, a six-stroke engine is insufficient in gas inlet in the secondary combustion stage, poor in oil-gas mixing quality and low in combustion efficiency, according to the technical scheme, the six-stroke engine comprises a combustion chamber assembly, a fuel injector, a transmission mechanism and a gas distribution mechanism; the gas distribution mechanism comprises a gas inlet pipeline, an exhaust pipeline, a gas storage cavity, a gas inlet pipeline valve, a scavenging duct and a scavenging duct one-way valve, the working cycle of the engine comprises two times of gas inlet and two times of oil injection combustion acting, and the gas storage cavity releases gas to supplement fresh air in the combustion chamber in the second time of gas inlet. The combustion chamber assembly comprises a cylinder, a piston and a cylinder cover, the piston reciprocates in the cylinder, and the cylinder and the cylinder cover are closed to form a combustion chamber. The invention is suitable for improving the heat efficiency and output performance of the engine, especially for an internal combustion engine power system requiring multiple combustion work.

The invention discloses a shafting vibration characteristic analysis method and system based on elastohydrodynamic lubrication, and relates to the technical field of mechanical engineering.The method comprises the steps that the entrainment speed, the time-varying curvature radius and the contact load at a contact point in a gas distribution-oil supply cam pair are determined; respectively inputting the entrainment speed, the time-varying curvature radius and the contact load at the contact point into a friction analysis model in an elastohydrodynamic lubrication state, and calculating a time-varying curve of the total interfacial friction force of the gas distribution-oil supply cam pair in the whole working cycle; based on time-varying friction excitation corresponding to any moment in the change curve, determining a system excitation vector of the gas distribution-oil supply cam pair by using interface friction as a key connection quantity through experimental testing and simulation modeling technologies; according to the system excitation vector and the structure parameters of the camshaft system, establishing a camshaft system torsional vibration characteristic coupling analysis model considering the interface elastohydrodynamic state; and solving the shaft system torsional vibration differential equation set to obtain the influence rule of the time-varying friction on the instantaneous vibration characteristics of the camshaft system.

The invention relates to the field of carrier steering control, in particular to a non-return transmission device for a carrier and a control system thereof.The non-return transmission device comprises a large bevel gear, a small bevel gear, a large straight tooth, a small straight tooth, a worm and a turbine which are sequentially meshed, the large bevel gear is fixed to an input shaft, the small straight tooth and the worm are coaxial, the turbine is fixed to an output shaft, and when the worm drives and the turbine drives, the large straight tooth and the small straight tooth are coaxial. Clockwise and anticlockwise rotation of the input shaft is transmitted to the output shaft; when running external force acts on the turbine through the output shaft to try to reversely drive the worm, force flow is cut off through the self-locking effect of the worm and the turbine, non-return of the output shaft relative to the input shaft is achieved, and hand beating and high-speed shimmy are weakened. The input shaft and the output shaft are coaxially arranged through a coaxial device, and the gears, the worm and the worm gear are installed in the shaft box. The control system is provided with an angular speed sensor, a temperature sensor, a vibration sensor, a working cycle number sensor and the like, signals are input into an electronic control unit, and state monitoring and fault early warning are carried out through the electronic control unit.

The invention provides a pile foundation excavation method and equipment, and belongs to the technical field of foundation pit engineering, the pile foundation excavation equipment comprises an integrated multi-head drilling machine, the integrated multi-head drilling machine can be fixedly mounted at a center hole through a bottom expansion locking mechanism, a plurality of holes can be formed at a time when the integrated multi-head drilling machine works, and the integrated multi-head drilling machine resets and rotates by a certain angle after working once. The drilling work is repeated, then an annular groove is drilled after multiple times of work, a rock core in the annular groove is taken out through a coring tool, then the rock and the mountain in the central area can be separated and taken out through a coring barrel, and the slag removal work is completed; by means of the expansion locking mechanism arranged at the bottom of the drilling machine, the integrated multi-head drilling machine can be fixed to a center positioning hole, the situation that equipment deviates in the working process and influences the overall drilling effect is avoided, the multiple drilling machines are arranged together, drilling work of multiple holes can be conducted at the same time, automatic drilling is achieved, the working efficiency is higher, and the drilling efficiency is improved. Meanwhile, workers do not need to go down to operate, and safety and reliability are achieved.

The invention discloses a gearbox fault diagnosis method based on a speed fluctuation periodic ring diagram, and the method comprises the following steps: 1, collecting a motor current signal, a motor instruction rotation speed signal and a motor rotation angle signal through an RV gearbox fault simulation experiment table, and enabling the fault type to be a sun gear single tooth crack wear fault; 2, setting a window parameter set in a certain range; 3, at a fixed moment, carrying out high-order multiple compression transformation on the fault motor current signal, and further extracting an actual current instantaneous frequency; 4, converting the actual current instantaneous frequency into an actual motor speed; 5, calculating speed fluctuation; 6, setting a speed fluctuation threshold value, and traversing all moments to obtain an optimal window parameter set; 7, self-adaptive high-order multiple compression transformation is carried out, and motor speed fluctuation is calculated in a self-adaptive mode in the complete work period; and 8, drawing a speed fluctuation periodic loop graph based on the motor rotation angle signal. According to the method, the gear box fault is visually displayed by detecting the abnormal speed fluctuation synchronous with the fault tooth meshing period, the problems that the resolution of traditional time-frequency analysis is low, distortion is caused by fixed window parameters, and the spectral analysis result is unreliable are solved, and the gear box fault can be more visually and accurately diagnosed.

This invention provides a fuel injection method for an engine, an engine, a vehicle, and a computer-readable storage medium, relating to the field of vehicle exhaust emission control technology. The fuel injection method provided by this invention includes the following steps: Before the engine reaches a stable idle speed, fuel is injected at a preset fuel pressure during the first intake stroke and the first compression stroke of each working cycle, wherein the fuel injection mass ratio of the first intake stroke to the first compression stroke is greater than 4:1, and the preset fuel pressure ranges from 20 to 50 MPa. When the engine speed is at a stable idle speed, fuel is injected during the second intake stroke and the second compression stroke of each working cycle at a preset fuel pressure, wherein the fuel injection mass ratio of the second intake stroke to the second compression stroke is greater than or equal to 4:1. This method ensures that the vehicle's exhaust emission level meets the requirements of Euro 6 emission standards without requiring a particulate filter, thus optimizing the engine's original emissions.

The invention discloses a double-layer powder material servo prepressing forming device and method, and belongs to the technical field of powder metallurgy forming. A set of built-in servo driving mechanism is additionally arranged on a traditional forming upper punching mechanism, a set of movable pre-pressing upper punching mechanism is additionally arranged, after first-time powder filling is completed, the forming upper punching mechanism stops at the first position, at the moment, the pre-pressing upper punching mechanism conveys a pre-pressing upper punch to the upper side of a die cavity, and through control of a servo motor, the forming upper punching mechanism stops at the first position; the driving rod moves downwards to make contact with the pre-pressing upper punching mechanism, the pre-pressing upper punching head is pressed into the die cavity, the needed interlayer interface shape is pressed, then the driving rod and the pre-pressing upper punching head retreat, secondary powder filling is conducted, and the forming upper punching head enters the die cavity to conduct final forming pressing. Step-by-step powder filling and step-by-step pressing are achieved in one working cycle of the forming upper punching mechanism, the requirement that the interlayer interface shape of a final product can be set is met, operation is easy and convenient, the application range is wide, and the method can be popularized to various powder metallurgy devices.

This invention relates to the field of electric drive technology, and particularly to a dynamic matching method, device, system, medium, and product for electric drive systems based on load spectrum driving. The method includes: acquiring load spectrum data based on the operating conditions of the electric drive system and the fatigue work cycle table of engineering machinery; classifying the load spectrum data, judging the motor's overload suitability, and compiling a cyclic load spectrum; obtaining the motor's theoretical temperature rise result and the motor's thermal simulation temperature result; dynamically adjusting the motor's thermal capacitance coefficient and thermal resistance coefficient based on the obtained motor theoretical temperature rise result and motor thermal simulation temperature result; and outputting the final motor thermal capacitance coefficient and motor thermal resistance coefficient. For redundancy optimization in motor overload matching, a closed-loop process of drive system load spectrum acquisition – load spectrum analysis – overload temperature rise theoretical calculation – motor thermal simulation verification is used to solve the problems of excessive redundancy, insufficient dynamic adaptability, and poor economy in traditional motor selection.

The invention relates to a method for operating an industrial robot, wherein a plurality of movements are carried out by the industrial robot during a work cycle to be completed within a specified target cycle time, the speed of the movements being described by a speed parameter. According to the invention, the following steps are carried out in order to approximate the target cycle time and / or reduce the load on the industrial robot: a. selecting a plurality of movements in order to form a movement corpus and ascertaining movement data belonging to the movements in the movement corpus, the movement data comprising a load resulting from the movement, b. temporarily storing the movement data, including a unique assignment to the corresponding movement, c. evaluating the temporarily stored movement data and selecting at least one movement to be controlled by means of a control intervention, d. carrying out a control attempt involving at least one control intervention, a new speed parameter for a movement to be controlled being determined as part of a control intervention, whereby the target cycle time is approximated and / or the load on the industrial robot is reduced, and e. storing the new speed parameter generated during the control intervention as the new speed parameter for the movement to be controlled. The invention also relates to a control device.

This invention relates to a magnet insertion device for iron cores and a magnet insertion system having the same. The magnet insertion device includes a frame, a loading platform mounted on the frame, a guide plate above the loading platform, a pressing mechanism above the guide plate, several pushing mechanisms on the guide plate, a buffer feeding plate above the pushing mechanisms, and several buffer feeding mechanisms on the buffer feeding plate. The number of buffer feeding mechanisms corresponds one-to-one with the pushing mechanisms. Each buffer feeding mechanism includes a buffer feeding bin, a baffle plate below the buffer feeding bin, and a buffer feeding cylinder for driving the baffle plate. The baffle plate has a first position that blocks the bottom of the buffer feeding bin and a second position that avoids the bottom of the buffer feeding bin. The guide plate has several pressing ports corresponding to the number of pushing mechanisms, and a blocking component above the pressing ports to restrict the falling of the magnets. This invention has a magnet buffering function, effectively accelerating the working cycle and improving work efficiency.

This invention provides a cigarette sealing unit and its cavity forming device and method. The cavity forming device includes a driving mechanism, a pushing mechanism, an extrusion mechanism, and a pressure receiving mechanism. A film to be formed is disposed between the extrusion mechanism and the pressure receiving mechanism. The driving mechanism drives the pushing mechanism to move downward in a vertical direction, and the extrusion motion moves synchronously towards the pressure receiving mechanism. The film to be formed forms a cavity after being acted upon by the extrusion mechanism and the pressure receiving mechanism simultaneously. The cavity forming device has a non-working state, a pre-pressing state, and a forming state. The cavity forming device, according to the cavity forming method, combines the three states with three processes: pre-pressing, vacuum forming, and blow molding to complete the preparation of the cavity in the cigarette sealing unit. The cavity forming device of this patent achieves the organic integration of the three forming actions of pre-pressing, vacuum forming, and blow molding of the film to be formed through the precise cooperation of the extrusion mechanism and the pressure receiving mechanism, and the three actions occur synergistically within a continuous working cycle.

The bionic frog robot comprises front limbs, rear limbs and a body frame, a front rotating shaft is installed in front of the body frame, the front limbs are installed on the front rotating shaft, and a front driving motor and an attitude sensor are installed on the upper surface of the body frame; the front driving motor drives the front rotating shaft to rotate in a vertical transmission mode, the rear rotating shaft is installed on the rear portion of the body frame, the two ends of the rear rotating shaft are installed at the eccentric positions of the cams, the rear driving motor is installed on the upper surface of the body frame and drives the rear rotating shaft to rotate in a vertical transmission mode, and frog-shaped palms are arranged at the front ends of the posterior limbs. Guiding pieces are mounted at the rear ends of the hind limbs and connected with the stand columns of the body frame through force storage springs; the cam phase locking technology is applied to the jumping robot, the three-stage cam structure achieves the work cycle of energy storage, locking and releasing, continuous jumping is achieved, and the interval of continuous jumping is greatly shortened.

This invention proposes a hysteresis compensation control method for high-speed switching valves based on PWM, belonging to the field of high-speed switching valve control. Its key feature is that the working cycle of the high-speed switching valve is divided into four stages. The rising and falling edges of the reference PWM control the opening and closing times of the high-speed switching valve, while the loading signal consists of on-compensation PWM, excitation PWM, opening-hold PWM, and closing compensation PWM. By varying the pressure before the valve, the critical voltage values ​​for opening and closing the valve core are obtained, thereby controlling the amplitudes of the on-compensation PWM and opening-hold PWM to reduce the hysteresis time and current consumption of the valve core response. The duty cycle of the excitation PWM is determined by the derivative of the pressure before the valve, and the duty cycles of the on-compensation PWM and closing compensation PWM are obtained based on the coil current, accelerating the valve core response speed and optimizing current consumption. This invention can improve the response speed of high-speed switching valves, reduce energy consumption, and expand the frequency response range, offering advantages such as high response, low power consumption, low cost, and small footprint.

The invention provides a lubricating system, a lubricating control method, a controller and a vehicle. Relates to the technical field of engineering vehicles and comprises a controller, and a lubricating pump, a first pressure sensor and a second pressure sensor which are respectively connected with the controller. Wherein the lubricating pump is used for pumping a lubricating agent from the storage device into the at least one oil injector through the main pipeline; the first pressure sensor is arranged on the main pipeline, located between the lubricating pump and the at least one oil injector and used for detecting the outlet pressure of the lubricating pump. The second pressure sensor is arranged at the tail end of the main pipeline and used for detecting the tail end pressure of the main pipeline; and the controller is used for determining whether the working cycle of the lubricating pump is ended or not according to the pressure detected by the second pressure sensor. The system is used for automatic lubrication control of the engineering vehicle, the end time of the working cycle of the lubrication pump can be accurately judged by detecting the pressure at the tail end of the main pipeline, it is ensured that a lubricant accurately covers all lubrication points, mechanical abrasion is reduced, and the lubrication effect is improved.

The application provides an automatic control method of an excavator, an excavator controller, an excavator and a medium, and relates to the technical field of excavator control. The method comprises the following steps: acquiring a current work track corresponding to a first work cycle of the excavator; determining a relative position and a relative height between a starting point and an ending point of the current work track; determining a target work track with the shortest distance between the starting point and the ending point according to the relative position and the relative height of the current work track; determining a target speed proportion relationship between a swing speed of a swing arm and a lifting speed of the swing arm according to the target work track; determining an actual handle opening degree of an operation handle according to the target speed proportion relationship, and automatically controlling the excavator according to the actual handle opening degree. According to the method, the handle opening degree can be automatically adjusted according to an actual working condition, so that different working conditions can be automatically adapted, the operation difficulty of the excavator is reduced, and the working efficiency is improved.

The invention discloses an engine direct injection control method and system, a vehicle and a main controller applied to the engine direct injection control system, and the system further comprises at least two oil injectors arranged in an engine cylinder. The rotating speed of an engine, the cooling liquid temperature, the catalytic converter temperature and the required torque are obtained; according to the rotating speed, the temperature of the cooling liquid and the temperature of the catalytic converter, the operation mode of the engine is determined, and the injection control step is executed and comprises the substeps that the required torque is controlled based on the operation mode, the rotating speed and the required torque; the injection starting angle of each oil injector in the at least two oil injectors in one engine working cycle and the injection pulse width corresponding to each injection starting angle are obtained; controlling at least two oil injectors to inject according to the corresponding injection pulse width and injection starting angle in one engine working cycle; and the operation mode of the engine is monitored, and if the operation mode is changed, the injection control step is executed based on the changed operation mode until the engine stops working.

The invention relates to a thermoforming packaging machine (1) comprising at least one transport chain (9) which grasps a bottom film (8) and transports it in a transport direction (R) for each main work cycle, and at least one drive unit (18) for driving the transport chain (9) in the transport direction (R), wherein, for fine positioning of the transport chain (9) in an area of ​​at least one work station of the thermoforming packaging machine (1), a pairing of several chain links (16) of the transport chain (9) driven in the transport direction (R) by means of the drive unit (18) with a separately driven toothing (17, 17') can be produced.

The application discloses a waste gas purification device with a detection effect, and relates to the technical field of air pollution. The waste gas purification device with the detection effect comprises a purification device, a power device arranged on the upper side of the outer surface of the purification device, a purification device box, an inlet and outlet base fixedly connected to the left side of the outer surface of the purification device box, and a fixed pipe fixedly connected to the left side of the outer surface of the inlet and outlet base. The waste gas purification device with the detection effect is provided with the power device arranged on the upper side of the outer surface of the purification device and a rotating motor arranged in the power device. When the rotating motor is started, the rotating circular shaft drives the fan-shaped gear plate to move up and down. Since the left side of the outer surface of the fan-shaped gear plate is overlapped with the outer surface of the pushing gear rod, the rotating cylinder is driven to rotate, and the filter cylinder is driven to rotate. The rotating of the filter cylinder can rotate the filtering surface, reduces the frequency of manual replacement, increases the working period, and reduces time and manpower.

The invention relates to a method for operating an industrial robot, wherein the industrial robot performs a plurality of movements during a work cycle to be completed within a predetermined target cycle time, the speed of which is described by a speed parameter. According to the invention, the following steps are carried out to approximate the target cycle time and / or reduce the load on the industrial robot: a. Selecting multiple movements to form a movement set and determining movement data belonging to the movements in the movement set, wherein the movement data includes a load resulting from the movement, b. Temporarily storing the movement data, including a unique assignment to the corresponding movement, c. Evaluating the cached motion data and selecting at least one motion to be controlled by a control intervention, d. Performing a control attempt comprising at least one control intervention, wherein, within the framework of a control intervention, a new speed parameter for a movement to be controlled is determined, thereby approximating the target cycle time and / or reducing the load on the industrial robot, and e. Saving the new velocity parameter generated during the control intervention as the new velocity parameter for the movement to be controlled. The invention also relates to a control unit.

The utility model discloses a synchronous rapid driving device for online hard surface surfacing of a grinding roller and a grinding disc, and relates to the technical field of coal mills. The coal mill comprises a coal mill body and a milling roller, an inner gear ring is arranged on the side wall of an inner ring of the coal mill body, a connecting ring is fixedly installed on the side wall of the milling roller, a transmission loose gear ring is fixedly installed on the connecting ring, and the transmission loose gear ring is meshed with the inner gear ring. And a protection mechanism is arranged on one side of the inner gear ring on the side wall of the coal mill body. According to the utility model, the grinding bowl and the grinding roller can synchronously rotate, so that the grinding bowl and the grinding roller can work together, the welding efficiency is further improved, the working period is accelerated, and meanwhile, in the transmission process, the arranged air blowing fan can start to supply air, so that the air is guided into the two air blowing pipes and then is exhausted by virtue of the exhaust holes in the air blowing pipes; in this way, the transmission loose gear ring and the inner gear ring can be cleaned, and then the stability of gear rotation is guaranteed.

This invention proposes a strip stamping forming device for a distributor, belonging to the technical field of distributor production equipment. The device includes a frame, a stamping table, a pre-clamping mechanism, and a blanking mechanism. A main drive mechanism is mounted on the frame, and a stamping die is installed on the main drive mechanism. The pre-clamping mechanism and the blanking mechanism are configured to sequentially perform the following operations within a complete working cycle of the main drive mechanism: driving the stamping die downwards while simultaneously driving the pre-clamping mechanism to clamp the strip before the punch of the stamping die contacts the strip; maintaining the clamping force while allowing the stamping die to complete the stamping stroke; driving the stamping die back upwards while simultaneously driving the blanking mechanism to separate and blank the formed part. Specifically, this invention provides a strip stamping forming device for a distributor that solves the problems of response delay and control asynchrony between the independent clamping mechanism and the main stamping action in the prior art through the time-sequential linkage of the pre-clamping mechanism, the blanking mechanism, and the main drive mechanism.

A method of controlling power consumption of an electrical mining and / or construction machine (2) connected to an electrical network (10) is provided, wherein the machine (2) comprises one or more electrical power consuming devices (110, 120). The method comprises the following steps: detecting an event in the network (10) based on measurements, and determining a possible change in the power consumption in the machine (2) based on work cycle thereof. Subsequently, based on the detected event in the electrical network (10) and the possible change in power consumption, a required change in the power consumption in the machine (2) is determined and requested. Based on the requested change in the power consumption in the machine (2), the power consumption in the machine (2) is adjusted. An electrical mining and / or construction machine (2) controlled according to the method is also provided.

The invention relates to the technical field of data processing, in particular to an engine fault detection method and system. The method comprises the steps that the standardized energy deviation of the current working cycle is determined according to the working condition similarity of the current working cycle and multiple historical reference working cycles in the engine operation process and the vibration energy of vibration signals of all the historical reference working cycles; decomposing the current working cycle into a power stroke and a compression stroke, determining a stroke asymmetric index according to the angular velocity fluctuation degree of the power stroke and the angular velocity fluctuation degree of the compression stroke, and determining an instantaneous risk index of the current working cycle by integrating the standardized energy deviation and the stroke asymmetric index; and performing time sequence accumulation analysis on the instantaneous risk index to detect whether the engine has a fault or not. The method improves the accuracy and reliability of engine fault detection.

The invention relates to the technical field of batteries, and provides a battery capacity optimization method and system and a computer, and the battery capacity optimization method comprises the steps: obtaining a single-time working cycle road section of an electric mining truck fleet, and obtaining a road section data set corresponding to each sub-road section; constructing a vehicle comprehensive mass matrix; calculating the total energy consumption of the vehicle based on the plurality of road section data sets and the vehicle comprehensive mass matrix; calculating the vehicle discharge depth based on the battery capacity data set and the total energy consumption of the vehicle to obtain a plurality of battery lives; based on the total energy consumption of the vehicle and the service life of a plurality of batteries, constructing a comprehensive objective function; and iteratively calculating a historical optimal solution based on the comprehensive objective function, a grey wolf optimization algorithm and a Levy flight strategy so as to output an optimal battery capacity data set. By adopting the method, the physical model is enabled to be comprehensive and accurate, the optimization effect is improved, and the phenomenon that the optimization process is caught in a local optimal solution is avoided.

This invention discloses a gradient printing feeding system for cross-modulus materials. An ultrasonic oscillator is fixed outside a mixing tank. The mixing tank is connected to a gradient feeding system, which in turn is connected to a screw extrusion system. The gradient feeding system includes discharge pipes, liquid pipes, one-way valves, and a multi-port connector. Multiple discharge pipes are sequentially opened along the vertical height of the mixing tank, with each discharge pipe's opening height corresponding to one of the layered materials. Each discharge pipe is connected to a liquid pipe, and each liquid pipe is equipped with a one-way valve. The multi-port connector is installed on the upper side of the screw extrusion system and is connected to all the liquid pipes, used to feed the material in the liquid pipes into the screw extrusion system. This invention eliminates the need to stop the printing process to change materials during the entire printing process. Material switching during printing is achieved through gradient feeding, resulting in a short working cycle and high efficiency.