636 results about "Speed control system" patented technology

The invention provides a color steel plate coating flatness evaluation method and system based on artificial intelligence. According to the method, the three-dimensional point cloud data is generated by collecting the interference fringe image, and the surface fluctuation characteristics are quantified; capturing a multi-dimensional vibration spectrum of the transmission roller shaft, generating a servo motor compensation control signal, driving a multispectral scanning head to perform reverse displacement compensation, and generating real-time compensation data; inputting the surface topography features in the three-dimensional point cloud and the real-time compensation data into a lightweight convolutional neural network, and outputting fusion features; and dynamically classifying and identifying surface defects and uneven areas based on the fusion result, adjusting a classification threshold in combination with the speed of the production line, outputting a flatness evaluation result, and synchronizing the flatness evaluation result to a speed regulation system of the production line to realize closed-loop optimization. According to the method, laser interference, vibration compensation and lightweight AI technologies are fused, dynamic high-precision evaluation of the surface flatness of the color steel plate of the high-speed production line is achieved, and the problems of defect misjudgment and measurement distortion caused by vibration interference are solved.

The invention relates to the technical field of intelligent transportation control, in particular to a tomato transportation speed self-adaptive adjustment method based on path road condition feedback, which comprises the following steps: acquiring road images, vibration waveforms and altitude data through a multi-source sensing unit, and constructing real-time road condition information; identifying a driving mode and extracting a corresponding bumping parameter; detecting the maturity grade of the tomato by combining multispectrum and thermal imaging, and querying a maturity-compressive strength corresponding table to calculate a cargo damage threshold value; constructing a dynamic mapping model under multiple working conditions, predicting vibration response and converting the vibration response into equivalent pressure; comparing the equivalent pressure with a damage threshold value to obtain a safety margin, constructing a speed adjustment decision tree and generating a maximum allowable speed value of each road section; and dynamically generating a segmented variable-speed control instruction based on the speed decision matrix, and controlling a throttle valve and a braking system to cooperatively change speed. The method has the advantages of accurate working condition identification, dynamic fruit adaptation, closed-loop speed regulation and control and the like, and is suitable for fine speed control of a high-sensitivity fruit and vegetable transportation scene.

The invention discloses an intelligent control type expansion coating preparation reaction kettle device which comprises a reaction kettle body, the interior of the reaction kettle body is divided into a plurality of independent stirring cabins through partition plates, each stirring cabin is internally provided with an independent stirring assembly, a feeding assembly and an observation assembly, and each stirring assembly comprises a stirring shaft, stirring blades and a driver; the stirring blade is provided with a semiconductor chilling plate and a heating element, and the feeding assembly comprises a plurality of feeding channels connected with the stirring cabin, is provided with a flow meter, an electromagnetic valve and a dynamic adjusting module, and is used for independently controlling the feeding amount and the feeding speed of each cabin; the control system comprises a multi-channel data acquisition module, a learning module and a coordination control module, the multi-channel data acquisition module is provided with a sensor network for monitoring the temperature, the pressure and the material state of each stirring cabin in real time for each stirring cabin, and the control system performs coordination control on the stirring cabins according to preset parameters or autonomous learning results. And the stirring speed, temperature and feeding strategy of each cabin are dynamically adjusted.

Systems and methods related to adaptive ribbon speed control for a line matrix impact printer are provided. A ribbon cartridge includes a ribbon configured to be driven at a ribbon speed, and a ribbon gear configured to rotate with movement of the ribbon. The ribbon includes a ribbon joint patch detectable via a first sensor to determine a first ribbon speed of the ribbon. Rotation of the ribbon gear is detectable via a second sensor to determine a second ribbon speed of the ribbon. A target ribbon speed is determined based on at least one print job characteristic. A current ribbon speed is determined based on the first ribbon speed and the second ribbon speed. The ribbon speed is adjusted based on a difference between the current ribbon speed and the target ribbon speed. Associated systems and methods are also provided.

The invention provides a dynamic cooperative speed regulation control system and method for a machine tool spindle and a feed shaft, and the method comprises the steps: building a spindle energy transmission model and a feed shaft load-motion model, and constructing a strong correlation coupling relation between the two through cutting power; collecting main shaft power, torque and rotating speed and feed shaft cutting force, acceleration and displacement data in real time, and fusing to generate a combined state vector; calculating spindle margin and time correction based on spindle actual power and torque, and identifying working condition abrupt change according to the joint state vector; the feeding speed and the cutting depth are dynamically adjusted with the spindle margin sum as the constraint condition, and a cooperative adjustment strategy is generated; and converting the cooperative adjustment strategy into a feed shaft motion instruction and executing the feed shaft motion instruction. By constructing a real-time coupling closed loop of'spindle power-torque-rotating speed 'and'feed shaft speed-acceleration-position', the spindle is always locked to operate in a maximum power-torque envelope efficient area, the speed of the feed shaft is dynamically adjusted according to the spindle margin, locked rotor is completely eradicated, and no-load is eliminated.

The invention relates to the technical field of cutting machine control, in particular to a wire cutting machine feeding speed control system and method.The wire cutting machine feeding speed control method comprises the steps that a multi-mode signal recognition material module extracts current and vibration signal features through the self-adaptive feature selection technology, and the current and vibration signal features are obtained on the basis of an improved random forest model; a processing material is identified by combining dynamic weight voting and a weighted fusion method, and online learning and model updating are supported so as to adapt to processing requirements of different materials. The double-loop self-adaptive control module comprises outer-loop initial compensation and inner-loop fuzzy PID adjustment, real-time fine adjustment parameters are optimized according to historical machining records and double-target error values, machining precision and stability are ensured, and machining quality is improved. And the energy consumption management optimization module intelligently regulates and controls the energy consumption of the system by identifying non-processing and processing periods, so that the overall energy efficiency is improved, and energy-saving production is realized. According to the invention, the efficiency and the accuracy of the wire cutting machine in machining of multi-variety and small-batch dies are improved.

The invention discloses an automatic driving vehicle longitudinal speed control system and method based on a game theory, and the system comprises a self-vehicle game strategy module which is used for constructing a first strategy set related to a self-vehicle longitudinal driving game, and calculating a first game income corresponding to a self-vehicle longitudinal driving game strategy; the manual driving vehicle game strategy module is used for constructing a second strategy set about the manual driving vehicle lane changing game and calculating a second game revenue corresponding to the manual driving vehicle lane changing game strategy; the game solving module is used for planning the optimal longitudinal driving track of the vehicle based on a master-slave game strategy according to the first strategy set, the second strategy set, the first game income and the second game income; according to the method, driver behavior characteristics, environmental constraints and multi-objective optimization can be comprehensively considered, game optimization between a self-driving vehicle and a manual driving vehicle is carried out, the decision robustness of a mixed driving environment is improved, unreasonable cut-in behaviors are effectively inhibited, and the collision risk is reduced.

A vehicle includes a speed control system that is configured to increase and decrease vehicle speed when a command is received from a control system. The speed control system may include an engine that provides positive torque, and a friction-based system that is configured to provide negative torque to decrease vehicle speed. The control system may provide negative torque commands to activate a friction-based system of a trailer, and a trailer torque can be adjusted by changing a gain of negative torque commands to the trailer. The control system may utilize a baseline gain if trailer fade is not detected. The control system may decrease the gain of negative torque commands to the trailer if the negative torque of the trailer for an applied gain decreases with time.

The invention relates to the technical field of automobile parts, in particular to visual inspection equipment for automobile parts. The device comprises a detection device body, a base is arranged in the detection device body, a detection conveying device is arranged at the top of the base, an annular conveying device is arranged on one side of the detection conveying device, and a guardrail is arranged between the detection conveying device and the top of the annular conveying device; an intercepting device and a steering device are arranged in the guardrail and located at the top of the detection conveying device, and an image acquisition device is arranged at the top of the base and located over the detection conveying device. A detection conveying device is arranged to be a three-section independent speed control conveying device and is driven by a first motor, a second motor and a third motor respectively, and meanwhile, image acquisition equipment is linked with a speed control system, so that the equipment can dynamically adjust the conveying speed of each section according to the types of parts; the problems of smear of high-precision components and low efficiency of conventional components caused by fixed speed are solved.

The invention discloses a decoupling control system and method for a supercritical carbon dioxide direct circulation nuclear power plant. A compressor inlet temperature constant control strategy and a compressor inlet pressure constant control strategy are adopted. A compressor inlet temperature control system adjusts the opening degree of a cooler cold side valve, and a compressor inlet pressure control system adjusts the working medium filling and discharging of a capacity box. In order to guarantee the power supply quality, a transmission shaft rotating speed constant control strategy is adopted, and transmission shaft auxiliary torque is adjusted through a transmission shaft rotating speed control system. In order to ensure the system efficiency, a reactor core outlet temperature constant control strategy is adopted, and a reactor core outlet temperature control system is used for adjusting the opening degree of a control valve; in order to achieve the reactor following operation target, a reactor core power matching demand power control strategy is adopted, the control rod speed is adjusted through a power control system, and based on the neuron PID decoupling control technology, the control target that each output parameter in the system is only influenced by a certain specific input parameter is achieved.

The invention discloses a speed control optimization method for an electric vehicle, and belongs to the technical field of PID control, and the method comprises the steps: S1, constructing an electric vehicle speed control system; s2, improving an information acquisition optimization algorithm, wherein an improved strategy is as follows: D1, introducing a hyperbolic cosine adaptive weight factor omega, and D2, using a growth helix updating strategy fused with reverse learning; s3, parameter setting is conducted on a PID controller module of the electric vehicle speed control system through an improved information acquisition optimization algorithm, and optimal three parameters Kp, Ki and Kd are obtained through algorithm optimization; and S4, applying the three optimal parameters of the PID controller obtained through optimization of the improved information acquisition optimization algorithm to the PID controller of the electric vehicle speed control system so as to optimize the control performance of the whole control system.

The invention discloses a hydraulic speed regulation control system of a feed pump turbine valve, which comprises a regulating valve control unit, and the regulating valve control unit comprises a regulating valve hydraulic control block and a regulating valve hydraulic servo-motor. A servo valve, a filter, a hydraulic control one-way valve, a differential pressure type plug-in loading and unloading valve, an upper plug-in stop valve, a lower plug-in stop valve, a quick-closing electromagnetic valve, a first pressure oil channel, a first oil discharge channel and a safety oil channel are fixed in the adjusting valve hydraulic control block. The safety oil duct is connected with the first pressure oil duct and the differential pressure type plug-in loading and unloading valve. The quick-closing electromagnetic valve is connected in parallel between the safe oil duct and the oil discharge channel I; an oil inlet of the servo valve is communicated with the filter, a control oil port is connected with the differential pressure type plug-in loading valve through the hydraulic control one-way valve, and the differential pressure type plug-in loading valve is connected with the lower plug-in stop valve; and the regulating valve hydraulic servo-motor is respectively connected with the upper cartridge stop valve and the lower cartridge stop valve. According to the system, the servo valve and the filter element can be replaced on line, and the technical problem that the servo valve and the filter element cannot be replaced on line in an existing regulating valve speed regulating system is solved.

The invention discloses an SPMSM speed regulation control method and system based on reduced-order expansion observation composite passive, and the method comprises the steps: collecting the rotating speed and three-phase current signals of a surface-mounted permanent magnet synchronous motor, and controlling the output of an inverter through a space vector pulse width modulation module through a reduced-order expansion observation composite passive controller, thereby controlling the rotating speed; according to the reduced-order expansion observation composite passive controller, on the basis of a port controlled Hamiltonian model, an interconnection and injection damping distribution method is adopted to set a passive controller, a torque observer is designed to estimate the external load torque in real time when a motor operates, the external load torque is fed forward and compensated to the passive controller, and the torque of the motor is calculated. Meanwhile, a reduced-order expansion observer is designed to estimate total error disturbance between an ideal system and an actual system, and a passive controller is corrected in a feedforward mode. According to the method, the robustness of the surface-mounted permanent magnet synchronous motor speed regulation system to load variation, model parameter uncertainty and unknown disturbance can be effectively enhanced, and stable and efficient control under complex working conditions is realized.

The invention relates to the technical field of boiler induced draft fans, and discloses a boiler induced draft fan speed regulation system based on self-adaptive control, which is characterized in that a data acquisition module acquires outlet flue gas flow velocity data and flue gas oxygen content data of a boiler furnace at different sampling moments; the flow velocity analysis module performs time segmentation on the sampling time to obtain a plurality of time intervals, and determines a hearth outlet flue gas flow velocity fluctuation factor according to outlet flue gas flow velocity data; the combustion analysis module determines instantaneous flue gas oxygen content data and calculates a hearth combustion deviation factor; and the speed adjusting module performs weighted summation on the hearth outlet flue gas flow velocity fluctuation factor and the hearth combustion deviation factor to obtain a hearth comprehensive influence coefficient, performs speed regulation on the boiler induced draft fan according to the hearth comprehensive influence coefficient, and realizes multi-source monitoring analysis of the boiler hearth based on time sequence change and data change. Therefore, the dynamic and accurate speed regulation of the induced draft fan is ensured, the combustion efficiency of the boiler is improved, the energy consumption is reduced, and the stability and reliability of system operation are enhanced.

The invention discloses an improved fan speed control optimization method, which belongs to the technical field of PID (Proportion Integration Differentiation) control optimization and comprises the specific steps of S1, constructing a fan speed control system; s2, improving a hyperbolic sine and cosine optimization algorithm; s3, performing parameter optimization on a PID controller module of the fan speed control system by using an improved hyperbolic sine and cosine optimization algorithm, and obtaining a group of optimal values of control parameters Kp, Ki and Kd under a set number of iterations; s4, inputting a group of optimal control parameters obtained through optimization in S3 into a PID controller module, and adjusting the speed of a fan to reach a target rotating speed by controlling a motor driving module; the PID controller parameters of the fan speed control system are optimized through the improved hyperbolic sine and cosine optimization algorithm, so that the control precision and robustness of the system are improved, and the adaptive capacity of the fan in different controlled scenes is enhanced.

The invention relates to a capacitor module for optimizing an air-cooled heat dissipation structure, the capacitor module comprises a plurality of capacitor banks, each capacitor bank is composed of a plurality of capacitor monomers, the positive and negative electrodes of the capacitor monomers are electrically connected through a connecting sheet group, and the connecting sheet group comprises a plurality of first connecting sheets and second connecting sheets. The parallel connection and the series connection between the capacitor monomers are realized by adopting the first connecting sheet with a claw-shaped structure; the air cooling module is composed of a plurality of cooling fans, a temperature sensor and a speed regulation control system, the air speed of the cooling fans is regulated through the intelligent frequency conversion technology, regulation is conducted according to real-time data fed back by the temperature sensor, and therefore precise cooling control is achieved; the capacitor module is internally provided with a main air channel and an auxiliary air channel, the size and layout design of the air channels optimizes an airflow path, and the heat exchange area between air and the surface of the capacitor monomer is increased; the design can effectively reduce the heat dissipation efficiency, reduce the system energy consumption, prolong the service life of the capacitor module, and is suitable for the fields of energy storage systems, power equipment and the like.

Systems and methods related to adaptive ribbon speed control for a line matrix impact printer are provided. A ribbon cartridge includes a ribbon configured to be driven at a ribbon speed, and a ribbon gear configured to rotate with movement of the ribbon. The ribbon includes a ribbon joint patch detectable via a first sensor to determine a first ribbon speed of the ribbon. Rotation of the ribbon gear is detectable via a second sensor to determine a second ribbon speed of the ribbon. A target ribbon speed is determined based on at least one print job characteristic. A current ribbon speed is determined based on the first ribbon speed and the second ribbon speed. The ribbon speed is adjusted based on a difference between the current ribbon speed and the target ribbon speed. Associated systems and methods are also provided.

The invention discloses a thermal power generating unit transition peak regulation intelligent cruise control method based on an intelligent control algorithm, and relates to the technical field of intelligent control algorithms, and the method comprises the steps: constructing a distributed sensor network through deploying distributed sensors at all key positions of a thermal power generating unit, and obtaining the operation parameters of the thermal power generating unit in real time; external data are introduced and integrated, and short-term load demand prediction is generated according to an intelligent control algorithm; constructing a dynamic optimization function by combining a power grid dispatching instruction and a load prediction result and by taking the minimum coal consumption, the shortest peak regulation response time and the minimum equipment life loss as targets; adopting a hybrid algorithm of model predictive control and reinforcement learning to obtain an optimal control instruction; the control instruction is transmitted to a boiler combustion system and a steam turbine speed regulating system, and the fuel amount, the water supply amount and the valve opening degree are regulated; and dynamically adjusting model parameters and fuzzy rule weights of model prediction control through reinforcement learning to realize adaptive control of the thermal power generating unit.

The invention discloses a steam turbine speed regulating system monitoring method and related equipment, and aims to overcome the defect of high state misjudgment rate of a steam turbine speed regulating system in a variable working condition environment in the prior art. The comprehensive operation state information of the system is obtained by collecting multi-source operation parameters of the steam turbine speed regulating system in real time. And constructing a dynamic reference model by utilizing historical normal state data to adapt to complex operation characteristics of the steam turbine. And a real-time health index is obtained by calculating the deviation between the real-time parameter and the dynamic reference value, so that quantitative evaluation of the health state of the system is realized. And false alarms are effectively reduced through a grading alarm mechanism. Combined features of the health indexes and the multi-source operation parameters are combined, common fault types can be accurately identified, and the fault diagnosis capability is improved. According to the invention, the monitoring precision and reliability of the steam turbine speed regulation system in the variable working condition environment are obviously improved, and powerful support is provided for stable operation and maintenance of the system.

The invention relates to the technical field of heat treatment devices, and particularly discloses a device for performing induction heat treatment on a dielectric material, which consists of a device host, a temperature control system, a speed control system, an induction heating device, a sample operation system, a graphite conveyor belt, a sample storage device, a temperature detection device, a cooling system, a vacuum cavity, a vent valve and a mechanical pump. The device host is connected with the temperature control system and the speed control system, and controls the induction heating device and the sample operation system to adjust the target temperature, the heating rate and the heating time. The dielectric sample is indirectly heated by heating the graphite conveyor belt. The sample operation system is connected with the cooling system and is in communication connection with the cooling system through the temperature control system, and the cooling speed and time can be controlled by controlling the sample operation speed and the refrigerant flow according to needs. The vacuum cavity is connected with a vent valve and a mechanical pump and is in communication connection with a central controller to control air pressure and the like. According to the invention, rapid heating and cooling control can be carried out in the heat treatment process of the dielectric material, the atmosphere and the air pressure can be adjusted, and the crystallization behavior of the dielectric material under rapid heating and cooling is deeply researched, so that the dielectric material with more excellent quality is prepared.

The invention relates to a variable-step-pitch radioactive aerosol filter paper taking mechanism and a detection device, the variable-step-pitch radioactive aerosol filter paper taking mechanism comprises a mounting bracket, a paper feeding auxiliary adjusting mechanism is arranged on one side of the mounting bracket, and a detection device body is arranged on one side of the mounting bracket; according to the device, the stepping motor is arranged to drive the winding action of the filter paper tape body, and the transmission shaft, the winding rod and the speed-adjustable control system are matched, so that the fine control of the sampling spacing is realized, and the device is suitable for the collection requirements of radioactive aerosols with different strengths or periods; the step pitch can be flexibly set according to actual working conditions, the use efficiency of filter paper is improved, the response capacity of a monitoring system to sudden radioactive events is enhanced, meanwhile, error accumulation is avoided through coordinated arrangement between the paper feeding mechanism and the detection device body, closed-loop control over the sampling and detection process is achieved, and the detection efficiency is improved. And the precision and the practicability of the whole device can be improved.

The invention provides an automatic solid powder sample adding instrument matched with an electronic balance. The automatic solid powder sample adding instrument comprises a bracket bottom plate; a lifting mechanism, a driving assembly, a powder barrel and a control system, the lifting mechanism is arranged on the support bottom plate, a cross beam is arranged on the lifting mechanism, and the lifting mechanism can drive the cross beam to ascend and descend; the driving assembly is arranged on the cross beam and can move up and down along with the cross beam; the driving assembly is detachably connected with the powder barrel and can drive the powder barrel to discharge; the control system is a multi-stage variable speed control system, the control system is electrically connected with the lifting mechanism to control the lifting mechanism to ascend and descend, and the control system is connected with the driving assembly to control discharging of the powder barrel. According to the automatic solid powder sample adding instrument, nondestructive installation and automatic use of the balance can be achieved, the sample adding efficiency and the sample adding precision can be considered at the same time through a multi-stage speed change control system, and therefore the structure can complete the weighing task from the sub-milligram level to the gram level.

The invention discloses an electromagnetic pulse coupling signal separation method based on optimized variational mode decomposition, and belongs to the field of signal processing. The method comprises the following steps: carrying out injection test on an engine rotating speed control system shielding wire harness, and constructing an electromagnetic pulse coupling signal data set; a population initialization process of a parrot algorithm is improved by adopting spatial pyramid matching chaotic mapping, population diversity is improved by utilizing uniform ergodicity and initial value sensitivity of a chaotic sequence, and premature convergence is avoided; a mirror reflection learning strategy is introduced to improve the optimization precision and convergence speed of the parrot algorithm; optimization is carried out by using input parameters of improved parrot optimization variational mode decomposition, and mode decomposition is carried out on electromagnetic pulse coupling signals of a rotating speed control system; and calculating a kurtosis factor of each intrinsic mode function, and selecting a reconstruction target signal of the intrinsic mode function with the minimum kurtosis factor. According to the method, efficient and accurate electromagnetic pulse coupling signal separation can be realized, and the stability and reliability of the system in a strong electromagnetic interference environment are improved.

Aspects of the invention relate to a speed control system (15) for a vehicle (10), a method and a vehicle (10). The system causes the vehicle (10) to travel at the target speed value. The speed control system (15) determines whether the vehicle is reaching the roof using a pitch rate signal indicative of a rate of change in pitch of the vehicle (10) and a travel surface gradient signal indicative of a gradient of a travel surface on which the vehicle (10) is traveling. The determination that reaching the top is occurring depending on the rate of change of the pitch exceeding a predetermined value; and a slope value of the traveling surface is lower than a predetermined value. A speed control system (15) outputs a speed reduction signal to reduce the speed of the vehicle when the vehicle is reaching the roof.

The utility model belongs to the technical field of water-turbine generator set speed regulation system control, and provides a 2 + 3 mode multi-redundancy speed regulation system, which comprises an electrical control component and an execution component, the execution component comprises a double-fine oil filter, a self-centering motor device, a main distributing valve, a first servo proportional valve, a second servo proportional valve, a double-proportional-valve switching valve, a motor / proportional valve switching valve, an emergency stop hydraulic valve and an emergency stop electromagnetic valve. According to the utility model, a proportional valve and stepping motor redundancy control mode or a double-servo proportional valve redundancy control mode and the like can be flexibly selected according to requirements, various fault conditions occurring in the operation process of equipment can be easily handled, and the reliability and the control stability of the equipment are greatly improved.

The invention relates to a conveyor speed regulation system. The material conveying machine speed regulating system comprises a detection unit, a controller and a driver. The detection unit is configured to detect operation state parameters of the mining machine or material load information of the material conveying machine in real time. The controller is configured to receive the operation state parameters of the mining machine or the material load information of the material conveying machine from the detection unit and generate a speed control signal based on the operation state parameters or the material load information. The driver is configured to receive the speed control signal from the controller and adjust power output by the driver to the material conveying machine in response to the speed control signal so as to adjust the running speed of the material conveying machine.

The invention discloses a speed control method for a high-speed water pump engine, which belongs to the technical field of PID (Proportion Integration Differentiation) control optimization and specifically comprises the following steps of: 1, constructing a speed control system for the high-speed water pump engine; step 2, improving a whale migration optimization algorithm: D1, generating an initial population of the algorithm by using a mixed sine and cosine mapping strategy; d2, improving a whale migration optimization algorithm by using an adaptive convergence step length strategy fused with crossover variation to update a mathematical model of an individual position; thirdly, parameter optimization is conducted on a PID controller module in the high-speed water pump engine speed control system through the improved whale migration optimization algorithm; 4, applying the optimal control parameters obtained in the step 3 to a PID controller module in a high-speed water pump engine speed control system; a PID controller module in the high-speed water pump engine speed control system is optimized through the improved whale migration optimization algorithm, and the adaptability and robustness of the whole control system are improved.

A control system 50 for controlling a powertrain 22 of a vehicle is configured to receive a desired occupant comfort level (62) and to receive occupant excitation information 63 indicative of movement

The invention relates to the technical field of air separation system control, in particular to a circulating fan control device of an air separation system, which comprises a circulating fan, a rotating speed control system and an inclination angle control system, the circulating fan is arranged at the upper part of a cooling tower, the rotating speed control system is connected with the circulating fan, and the inclination angle control system is connected with fan blades; starting and speed increasing of the circulating fan are controlled through the temperature of cooling water in a cooling tower filler layer, the rotating speed change of the circulating fan is controlled through a gearbox structure, energy consumption and vibration in a high-speed state are reduced, the included angle between fan blades and the horizontal plane can be changed under the high-temperature condition, the contact area between the fan blades and air during rotation is increased, and the cooling effect is improved. Diffusion of hot air is accelerated; the problems that when the difference between the outlet water temperature and the cooling water temperature in the cooling tower is large, hysteresis exists in starting of the circulating fan, the cooling effect is not obviously improved after the rotating speed is increased to a certain range, and energy consumption is increased are solved.

A speed control system for sorters (e.g. sliding shoe sorters) comprises a sensor for measuring a sorter current speed of a sorter and a speed controller for setting peripheral conveyor commanded speeds for peripheral conveyors in communication with the sorter. During acceleration or deceleration of the sorter (e.g., in response to start or stop events of the sorter, or from one operating speed to another operating speed), the speed controller sets the peripheral conveyor commanded speeds to match or track the sorter current speed in order to ramp up or ramp down speeds of the peripheral conveyors with that of the sorter, which accelerates or decelerates more slowly than the peripheral conveyors. The speed controller may control the speed of different types of peripheral conveyors (e.g., upstream, intermediate, downstream) in various ways based on the type of the peripheral conveyors and / or based on user-configurable exception settings.