40results about How to "Reduce the frequency of changes" patented technology

The invention provides a control method of a flexible torque of a rotary table of an electric drilling machine and a system thereof. When a drilling string occurs stick-slipping and the torque vibrates, the control function of the flexible torque of the rotary table is started; a torque sensor transfers the collected actual value of the torque of the rotary table to a programmable controller (PLC); the PLC works out the arithmetic average value of the actual value of the torque of the rotary table with n times; the actual value of the torque of the rotary table and the average value are compared, the compared deviation is used as a given disturbing signal of the speed of the rotary table and is used as a given signal of the speed of a speed governor of the rotary table after being superposed with a given signal of the speed of the rotary table so as to control the rotation speed of a main motor of the rotary table and lead the main motor of the rotary table to increase or reduce the speed, thus adjusting the torque of the rotary table. The method and the system thereof can lead the rotation speed of the rotary table to adjust in time with the size of the stick-slipping torque, thus effectively reducing the variable frequency of the torque of the rotary table and the amplitude of the stick-slipping torque, reducing the fatigue failure degree of the drilling string and reducing the probability of drilling accidents due to the fatigue of the drilling string.

The invention provides a relation-type database expansion method and a relation-type database expansion system. A database table comprises expansion fields, wherein default format texts serialized by class files are saved in the expansion fields; content of the default format texts is read from the expansion fields, and the content of the default format texts is de-serialized into matched class files; the operation on the class files are responded and the operated class files are serialized into the default format texts and then saved in the expansion fields. By means of the method and system, the design development work and change work of database table for every update can be reduced.

The invention discloses a depth binary feature facial expression recognition method based on a lightweight network, and belongs to the technical field of mode recognition. The method mainly comprisesthe following steps: firstly, constructing a set of convolutional neural network framework for binarizing parameters, and implanting a binary convolution mode into each residual network layer to forma bidirectional decision network model; then, extracting LBP dynamic radius features of an image input into the network based on pixel gradient and creating an LBP weight map with Huffman weight and an LBP binary map with Huffman weight; taking an LBP weight map, an LBP binary map and an original image as multi-input features of a BRCNN network, and constructing depth binary features; and finally,cascading and classifying the depth binary features. The parameter quantity during network training is greatly reduced, and the calculation cost of the network is reduced; the expression ability of the features is enhanced, and the robustness and rate of the method in facial expression recognition are improved.

The invention provides a data storage method in a storage cluster. The data storage method comprises the steps of obtaining initial distribution and balanced distribution of disks in a target homing group; when the source disk in the initial distribution fails, generating a corresponding fault table; determining post-fault distribution according to the equilibrium distribution and the fault table;judging whether a target disk corresponding to the source disk in the post-fault distribution is located in a fault table or not; if not, taking the equilibrium distribution as the final distributionof the target classification group. According to the method, the data migration amount can be reduced, the data reconstruction bandwidth is reduced, equipment resources occupied by reconstruction arereleased, the change frequency of the arrangement group is reduced, and the storage performance of the storage equipment is improved. The invention further provides a data storage system in the storage cluster, a computer readable storage medium and storage equipment, which have the above beneficial effects.

The invention provides a service change frequency based data warehouse modeling method and device. The method includes the steps: 102, setting service change frequency ranges; 104, analyzing service change frequency of each attribute of a service database source data table according to the service change frequency ranges; 106, setting the number of database tables according to the number of the service change frequency ranges of the service change frequency; 108, adding Hash fields to each database table so as to judge whether the database table is changed or not; S110, establishing corresponding data warehouse models according to all the database tables. Through the method and device, data history integrity is guaranteed, data redundancy or change frequency can be reduced effectively, influence on a whole data warehouse due to changes of the service data can be shielded effectively, data extraction performance is improved, and further stability of the data warehouse is guaranteed.

The invention discloses an establishing method and a system of a VBR (voltage behind reactance) electromagnetic transient simulation model of a synchronous generator. The method comprises the steps ofacquiring rotational frequency, a d-axis self-inductance coefficient, a d-axis damping winding inductance value, a q-axis mutual inductance coefficient, and a q-axis damping winding inductance value,calculating a d-axis subtranient potential and a q-axis subtranient potential, calculating an overall subtranient potential, acquiring a stator winding inductance parameter of the synchronous generator, determining a stator state equation, acquiring a rotor state equation of winding magnetic linkage, acquiring a rotor motion equation of the winding magnetic linkage, and establishing the VBR electromagnetic transient simulation model of the synchronous generator according to the stator state equation, the rotor state equation of the winding magnetic linkage and the rotor motion equation of thewinding magnetic linkage. The establishing method and the system can increase a simulation speed on the premise of ensuring simulation precision.

The invention discloses an electric water pump temperature control method for intelligent heat management for an engine. The electric water pump temperature control method for the intelligent heat management for the engine includes steps that setting delta T as the real-time water temperature difference between an inlet and an outlet of the engine (subtracting the water temperature at the inlet of the engine from the water temperature at the outlet of the engine) under the current working condition, setting delta Tmax-set as the upper limit value of the water temperature difference between the inlet and outlet of the engine set in a water pump control strategy, and setting delta Tmin-set as the lower limit value of the water temperature difference between the inlet and outlet of the engine set in the water pump control strategy; judging temperature under the real-time working condition, to be specific, if delta T is larger than delta Tmax-set, setting the temperature control target of the electric water pump as delta Tmax-set; if delta T is smaller than or equal to delta Tmax-set, further judging whether delta T is smaller than delta Tmin-set, if delta T is smaller than delta Tmin-set, setting the temperature control target of the electric water pump as delta Tmin-set; if delta T is larger than or equal to delta Tmin-set, setting the temperature control target of the electric water pump as delta T. Compared with the prior art, through regulating the water temperature difference between the inlet and outlet of the engine to improve the energy consumption, the rotating speed change frequency of accessories is effectively lowered, and the total energy consumption of the accessories is lowered.

The embodiment of the invention discloses a method and device for determining a flow generation source, electronic equipment and a computer readable storage medium, and relates to the field of privatedata security. A specific embodiment of the method comprises the steps of obtaining actual traffic of a to-be-tested application; extracting an actual characteristic character string from the actualflow; and determining a source SDK for generating the actual flow according to the actual feature character string, the corresponding relationship between each SDK and the feature character string contained in the actual code being recorded in advance. According to the method for determining the source SDK based on the code characteristics of each SDK, compared with flow characteristics used in the prior art, the code characteristics are lower in change frequency, the corresponding relation is easier to collect, update and maintain, and the source SDK generating the actual flow can be more accurately determined.

The invention discloses a CDN coverage scheme generating method and apparatus. The method comprises the following steps: when it is judged that a target area meets a CDN coverage scheme regeneration condition, regenerating a CDN coverage scheme, wherein the regenerating the CDN coverage scheme comprises: updating node coverage parameters and/or area coverage parameters, and generating a new coverage scheme according to the updated node coverage parameters and/or the updated area coverage parameters. By adoption of the CDN coverage scheme generating method and apparatus, the coverage scheme isautomatically calculated and released, the change frequency of a relationship mapping table is low, the maintenance workload can be reduced, and the maintenance efficiency is improved.

The invention provides a touch data processing method and device, equipment and a storage medium. The method comprises: determining the current state of an electromagnetic pen; if the electromagneticpen is in the writing state, determining touch data of the electromagnetic pen according to a first working mode; if the electromagnetic pen is in the suspension state, determining touch data of the electromagnetic pen according to a second working mode, wherein the touch precision in the second working mode is lower than that in the first working mode. By implementing the embodiment of the invention, when the electromagnetic pen is in a suspension state, the touch data of the electromagnetic pen are determined according to the second working mode, the touch precision corresponding to the determined touch position is lower than the touch precision in the first working mode in the writing state, the change frequency of the position of the cursor can be reduced, frequent shaking of the cursor is reduced as much as possible, and unnecessary resource consumption is avoided.

The invention provides an unmanned aerial vehicle turning planning control method and device, an electronic device and a storage medium. The method comprises the following steps: determining an initial turning radius of a preset curve flight path of the unmanned aerial vehicle flying through an included angle, and an initial inclination angle and an initial propeller tension in the flight processof the unmanned aerial vehicle according to each obtained parameter value of the unmanned aerial vehicle; generating a target curve flight path according to the target radius of the flight path in theprocess that the unmanned aerial vehicle obliquely flies over the included angle, controlling the unmanned aerial vehicle to fly along the target curve flight path when the unmanned aerial vehicle flies, and controlling the unmanned aerial vehicle to adjust the attitude according to the target inclination angle and the target propeller tension. Thus, the path turning point when the unmanned aerial vehicle flies is planned into a curve form, so that the unmanned aerial vehicle can fly through the path turning point as much as possible at a constant speed, the change frequency of the flight speed of the unmanned aerial vehicle is reduced, the flight time is shortened, and the working efficiency and stability are improved.

The invention discloses a sawtooth carrier PWM modulation method for a symmetric odd phase two-level inverter. The method comprises steps that phase modulation signals are divided into odd and even arrays, two sets of sawtooth carriers are determined for the phases based on grouping of the phases, a first set of carriers and a second set of carriers of a kth phase are alternately utilized, pulse width modulation is performed with kth phase modulation signals, further, a phase bridge arm power switch control signal is obtained, a driving signal of a power switch tube is generated, in this way,suppression of the symmetric odd phase two-level inverter CMV is achieved. The method is advantaged in that through switching between mirrored symmetric sawtooth carriers, the range of the sum of allthe phase switching states during one carrier cycle is reduced, moreover, through overlapping of straight edges of the sawtooth carriers of the phases, the change frequency of the sum of all the phaseswitching states is alleviated, and a purpose of reducing the amplitude and the frequency of the CMV is achieved.

The invention discloses a synchronous carrier modulation method for a three-level inverter, and the method comprises the steps: carrying out the negation of a three-phase sine wave, and injecting a specific offset, and obtaining three groups of three-phase initial modulation waves; respectively selecting specific initial modulation waves for three phases in different space angle regions to obtain three-phase actual modulation waves; obtaining two groups of carriers with opposite initial directions by setting the triangular carrier frequency to be the even number times of three of the fundamental wave frequency; selecting specific initial direction carriers in different space angle areas to obtain actual carriers; and formulating a comparison rule of the actual modulation wave and the actual carrier wave, and obtaining a control signal of the three-level inverter based on comparison of the actual modulation wave and the actual carrier wave, thereby realizing synchronous carrier wave modulation for reducing the common-mode voltage. According to the method, the amplitude of the common-mode voltage can be reduced by one half while harmonic waves of multiple of three and even harmonic waves in the line voltage are eliminated, the change frequency of the common-mode voltage can be reduced by two thirds, and the method has the advantages of being simple in calculation and convenient to implement.

The invention relates to a method for operating a wind turbine. The wind turbine has an aerodynamic rotor with at least one rotor blade which is mounted on a rotor hub of the rotor. A blade angle of the at least one rotor blade can be adjusted about its longitudinal axis with respect to the rotor hub. The invention also relates to a corresponding wind turbine. The method has the following steps ofproviding the current wind properties, providing an actual blade angle of the rotor blade or an average value of all actual blade angles of the rotor blades, determining a stationary blade angle of the at least one rotor blade which is guided to a desired stationary operating state of the wind turbine while taking into consideration known rotor properties, the electric system, and the wind properties, comparing the stationary blade angle with the actual blade angle or the average value of all actual blade angles, and adapting the operation of the wind turbine if the stationary blade angle deviates significantly from the actual blade angle or the average value of all actual blade angles.

A method for manufacturing radiator elements for heating, in particular aluminium radiator elements comprising the steps of: providing a base body (3), extending substantially along a longitudinal axis (A), and a head (7); arranging the head (7) on the base body (3) so as to bring to contact with each other the respective connection portions (26, 27) of the base body (3) and of the head (7), and to overlap respective contact surfaces (28, 29) of the connection portions (26, 27), set and overlapped and in contact with each other parallel to a longitudinal plane (P) of the element (2); fixing the contact surfaces (28, 29) to each other, for example by means of a welding and/or melting process or by means of gluing.