58 results about "Random switching" patented technology

The invention discloses a satellite route management and control switching method and system, and belongs to the field of satellite communication, and the satellite route management and control switching method comprises the following steps: monitoring satellite signal quality, collecting satellite data, judging whether nodes need to be switched or not, and if yes, switching the nodes; the triggering condition comprises that the signal quality decline is lower than a threshold value, and the communication equipment is about to break away from the current satellite network coverage range; when nodes need to be switched, an optimal switching target is selected from the candidate nodes, the signal quality of the optimal switching target is judged, and if the signal quality meets the use requirement, compared with the prior art, the method has the beneficial effects that when the coverage edge overlapping area of the multiple satellite networks is too small and the signal quality is judged to be poor, the optimal switching target is selected from the candidate nodes; according to the method, the switching node is limited, the random switching of the node is not allowed in the set time, the set time can be adjusted according to the actual condition, different conditions are matched, and the problems of communication quality degradation, network resource waste, terminal energy consumption increase and the like are reduced.

The invention relates to a true random number generation circuit and a chip, the true random number generation circuit comprises a clock signal generation module and a sampling module, the output end of the clock signal generation module is connected with one input end of the sampling module; the clock signal generation module is used for randomly switching the input current or voltage of the clock signal generation module according to a random signal so as to generate a jitter clock signal, and the sampling module is used for sampling a target clock signal according to the jitter clock signal so as to generate a true random number. The switching action of switching the input current or voltage can introduce jitter, and the input current or voltage is randomly switched through the random signal, so that the input time of the input current or voltage is random, the jitter degree of the generated jitter clock signal can be effectively increased, and the randomness of the generated true random number can be effectively enhanced; and the quality of the true random number can be effectively improved.

The invention discloses a power system random sampling control method based on attack compensation. The method comprises the following steps: constructing an adaptive random switching model, establishing a lightweight DoS attack detection and event trigger compensation mechanism, and optimizing a PD controller fusing compensation data, the method combines the random switching model, a network security defense mechanism and an optimization control strategy, and aims at a dynamic multi-mode power system containing an electric vehicle EV. The technical bottleneck of traditional load frequency control in the problems of random disturbance, network attack and mode switching dependency is solved, the method is suitable for improving the frequency stability and the anti-attack ability of the power system, and the anti-interference ability and the operation efficiency of the power system can be improved.

The invention discloses an event-triggered adaptive fixed time control method for a random nonlinear switching system. The method comprises the following steps: constructing a model of the random nonlinear switching system; introducing an event triggering mechanism; designing a fixed time control strategy; and designing an event-triggered fixed-time adaptive controller based on a backstepping method design framework. According to the event-triggered adaptive fixed time control method for the random nonlinear switching system, an event-triggered control strategy is adopted to reduce the communication burden of the system. A new controller is stably constructed by using fixed time, and the upper bound of convergence time is irrelevant to initial conditions; meanwhile, by introducing nonlinear mapping, a random nonlinear system with symmetric and asymmetric output constraints is converted into a new unconstrained system, and random switching of the control system is realized by using a switching signal.

The utility model relates to the technical field of monocular night vision device supports, and particularly discloses a monocular night vision device left and right eye switching support which is easy to operate and comprises a positioning plate, L-shaped plates are connected to the two sides of the top of the positioning plate, an arc-shaped mounting plate is fixedly connected to one side of each L-shaped plate, and an adjusting groove is formed in the positioning plate. A sliding block is slidably connected to the interior of the sliding groove, a square block is fixedly connected to the top of the connecting block, a monocular night vision device body penetrates through the interior of the round hole, an adjusting knob is in threaded connection with the interior of the threaded hole, and an extrusion block is fixedly connected to the bottom end of the adjusting knob. According to the monocular night vision device, the square block, the adjusting knob, the extrusion block, the sliding groove, the connecting block, the compression spring, the adjusting plate and the fastening knob are matched for use, so that the monocular night vision device body can be freely switched between the left eye and the right eye during use, the operation mode is simple during switching, and workers can conveniently use the monocular night vision device; and the height of the arc-shaped mounting plate can be adjusted as required.

The multifunctional multi-station flexible cleaning machine comprises an installation support, installation plates are fixedly installed on the two sides of the installation support at the corresponding heights, a plurality of independent lifting adjusting devices are correspondingly installed on the installation plates, and the independent lifting adjusting devices are correspondingly provided with different cleaning assemblies. Through the structural arrangement, the cleaning machine has the characteristics of multiple functions and multiple stations, and different cleaning procedures are set, so that different products can be randomly switched, or the stations can be exchanged according to different product objects, even more cleaning stations can be added, and different workers can be conveniently selected to clean the surfaces of the products.

The present application relates to a kind of multi-vehicle random switching flexible total assembly system for medium and large-sized passenger cars, including assembly platform and upper piece area, the upper piece area of assembly platform two sides respectively stores the side wall of two sides of the same vehicle;Upper piece area includes upper piece track and storage track, storage track is located in the two sides of upper piece track, upper piece track is equipped with assembly sliding table and welding robot sliding table, storage track is equipped with clamp, mobile tooling table and traction dolly, traction dolly connects mobile tooling table, clamp is fixed on mobile tooling table and connects two-way pneumatic-electric switching component, clamp clamps side wall and keeps clamping state when clamping side wall.Compared with prior art, the present application has the advantages that the clamp is fixed on the mobile tooling table and connected with the two-way pneumatic-electric switching component, the clamp is provided with air supply and power, the power and control signal of the clamp are not interrupted during transportation, the clamp keeps clamping state, the position of the side wall does not change, and the accuracy of the side wall assembly position is ensured.

This invention discloses a rammed earth device simulating the ancient ramming process of city walls. It includes a frame with a ramming machine hinged to the top of the frame, an electric ramming angle adjustment mechanism hinged between the ramming machine and the frame, a drill chuck connected to the bottom of the ramming machine, and a ramming head assembly connected to the drill chuck. The bottom plate of the frame has ramming holes for the ramming head assembly to pass through. A dust removal mechanism is arranged around the ramming holes on the frame. The ramming machine, the electric ramming angle adjustment mechanism, and the dust removal mechanism are all connected to a controller. This invention also discloses a method for using the rammed earth device simulating the ancient ramming process of city walls, including ramming angle adjustment, synchronous dust removal adjustment, ramming head assembly replacement, and ramming mode control. This invention can reproduce and simplify the ancient techniques used in the construction of ancient building foundations and city wall foundations, simulating the manual ramming and cluster ramming methods used in ancient building construction, while allowing for easy switching between single and continuous ramming.

The application provides a multi-target switching device, which comprises a target frame, a target plate, a driving mechanism and a base, the target frame comprises two power edges and two fixed edges; the target plate comprises an upper target plate and a lower target plate; one end of the first fixed edge is hinged to the base, and the other end is hinged to one end of the first power edge; the first fixed edge is arranged in a vertical state, can be tilted backward and fixed back; the second power edge is located in front of the first fixed edge, one end of the second power edge is connected to the driving mechanism and can rotate around the driving mechanism; the two ends of the second fixed edge are respectively hinged to the other ends of the two power edges; the upper target plate is fixedly connected to the second fixed edge, and the lower target plate is fixedly connected to the second power edge; when the two power edges are in a vertical state, the upper target plate and the lower target plate are located in the same plane; a shifting block is arranged on the second power edge. The application can independently realize random switching of the tactical posture of a combat unit and more realistically simulate the tactical action of the combat unit in actual combat.

The invention relates to a message forwarding method and device based on a unified scheduling gateway, equipment and a medium. The message forwarding method based on the unified scheduling gateway is applied to a public network IP unified scheduling gateway and comprises the steps that a target message sent by a sending end is received, and the sending end comprises any one of a public network, an nat gateway, a load balancer gateway and an elastic public network IP gateway; public network IP configuration information is determined based on the target message, speed limiting processing is performed on the target message based on bandwidth packet configuration information in the public network IP configuration information, and a binding relationship exists between the bandwidth packet configuration information and the nat gateway, the load balancer gateway and the elastic public network IP gateway; and when it is determined that the speed limit does not lose the packet, the target message is sent to the target receiving end based on the target tunnel information corresponding to the target message, so that random switching among different types of gateways is realized by uniformly scheduling the gateways through the public network IP, and the different types of gateways are placed in a uniform shared bandwidth packet.

The invention discloses a switching method and device without a random access process, a base station and a storage medium, and belongs to the technical field of wireless communication, the method comprises the following steps: receiving a switching request sent by a source station, the switching request comprising first spatial position information of a to-be-accessed terminal relative to a target station, and according to recorded second spatial position information of each successfully switched reference terminal relative to the target station, determining whether the to-be-accessed terminal satisfies an RACH-LESS switching condition, if the to-be-accessed terminal satisfies the RACH-LESS switching condition, sending RACH-LESS switching request confirmation information to the source station based on the switching configuration information of the reference terminal, and if the to-be-accessed terminal satisfies the RACH-LESS switching condition, sending the RACH-LESS switching request confirmation information to the source station. The to-be-accessed terminal executes a non-random switching process at the target station based on the received RRC reconfiguration connection request message sent by the source station, and the RRC reconfiguration connection request message carries switching configuration information. According to the invention, the switching time delay and the RACH resource overhead can be reduced, and the RACH-LESS switching success rate can be improved.

The present invention relates to the technical field of intelligent locks, and discloses a method, device, computer device and medium for password verification and unlocking of an electronic device. The method includes: detecting an unlocking operation on a display screen of the electronic device to be unlocked; displaying a password verification interface on the display screen according to the unlocking operation, wherein the password verification interface can be randomly switched to multiple password modes; obtaining a dynamic password trajectory input on the password verification interface, and determining contact interaction information and path information based on the dynamic password trajectory; verifying the contact interaction information and the path information based on dynamic restriction conditions corresponding to the current password mode to obtain a verification result, and controlling the electronic device to be unlocked to perform an unlocking operation according to the verification result. The present invention solves the problems of weak anti-attack ability and poor user experience caused by the low security of the static password mode, the difficulty for special users to remember complex passwords, and the single dynamic verification mechanism of traditional electronic devices to be unlocked.

The invention discloses a hysteresis current control method and system for a two-level grid-connected converter, and belongs to the technical field of converter control. The method comprises the following steps: fixing the switching frequency of the converter through a frequency inner ring; generating a reference square wave and collecting a switch square wave; multiplying and accumulating the two in each control step length, and taking an accumulated value as a phase discrimination result at the rising edge of a switching period to finish switching phase discrimination; comparing a phase discrimination result with a phase reference value, and processing the phase discrimination result by a PI (Proportional Integral) controller; pI output is processed and then fed back to a frequency instruction, a phase outer ring is formed through a frequency-phase integral relation, and closed-loop control of a switch phase is achieved. The technical problems that a traditional hysteresis control switch is random in phase and multi-machine parallel ripple offset cannot be achieved are solved, the advantage of dynamic performance of hysteresis control is kept, meanwhile, accurate fixing of the switching frequency and the phase is achieved, the system performance is remarkably improved, and the application scene of the system is expanded.

The present invention relates to a sliding mode control method for an inverted pendulum system based on a random communication protocol, belonging to the field of automatic control technology. The method combines sliding mode control for an inverted pendulum system based on a continuous dwell time with sliding mode control based on a random communication protocol to construct a coordinated controller. A discrete-time uncertain switching system model with a PDT switching rule is constructed, and combined with a random communication protocol scheduling mechanism, the random switching behavior of nodes accessing the network is described through a Markov chain. A token-dependent sliding mode control law is designed to dynamically adjust control parameters to accommodate SCP scheduling and PDT switching. A sliding mode function and a Lyapunov function are designed to ensure the accessibility of the sliding mode. The present invention effectively utilizes the advantages of a networked control method based on a continuous dwell time switching rule under random communication protocol scheduling, such as strong robustness, resource optimization, and reliable stability, effectively improving the operating efficiency of the inverted pendulum system.

The invention relates to the technical field of intelligent locks, and discloses an electronic equipment password verification unlocking method and device, computer equipment and a medium, and the method comprises the following steps: detecting an unlocking operation for a display screen on to-be-unlocked electronic equipment; a password verification interface is displayed on a display screen according to the unlocking operation, and the password verification interface can be randomly switched into a plurality of password modes; obtaining a dynamic password track input in the password verification interface, and determining contact interaction information and path information based on the dynamic password track; and verifying the contact interaction information and the path information based on a dynamic limiting condition corresponding to the current password mode to obtain a verification result, and controlling the to-be-unlocked electronic equipment to execute an unlocking operation according to the verification result. According to the method and the device, the problems of weak attack resistance and poor user experience caused by low security of a static password mode, difficulty in memorizing complex passwords by special users and single dynamic verification mechanism of the traditional electronic equipment to be unlocked are solved.

The multi-vehicle-type random switching flexible total splicing system comprises a splicing platform and part feeding areas, and side walls on the two sides of the same vehicle type are stored in the part feeding areas on the two sides of the splicing platform correspondingly; the workpiece feeding area comprises a workpiece feeding rail and storage rails, the storage rails are located on the two sides of the workpiece feeding rail, a splicing sliding table and a welding robot sliding table are arranged on the workpiece feeding rail, a clamp, a movable tool table and a traction trolley are arranged on the storage rails, the traction trolley is connected with the movable tool table, and the clamp is fixed to the movable tool table and connected with a two-way pneumatic-electric switching assembly. And the clamp is kept in a clamping state when clamping the side wall. Compared with the prior art, the device has the advantages that the clamp is fixed to the movable tool table and connected with the two-way pneumatic-electric switching assembly, an air source and electric power are provided for the clamp, power and control signals are kept uninterrupted in the clamp transportation process, the clamp is kept in the clamping state, the position of the side wall is not changed, and the accuracy of the splicing position of the side wall is guaranteed.

The invention discloses an anti-electromagnetic interference method for an electronic device in an electric dragging system, which comprises the following steps of: 1, respectively analyzing conduction and radiation type interference in the electric dragging system; 2, a second-order RLC low-pass filter is adopted; 3, selecting a control strategy and an algorithm; fourthly, inductance, capacitance and resistance parameters of the conducted interference filter are calculated; 5, selecting a random switching frequency modulation strategy; and 6, designing a rotary transformer signal processing circuit and filtering an output position angle of a decoding chip of the rotary transformer. In combination with an electrical principle of a motor driving device, firstly, an interference filter is selected, then, algorithm selection operation is performed according to selection of a control strategy, and finally, anti-interference design of electronic devices related to resolver calculation is performed, so that conduction type electromagnetic interference at a power supply end is effectively inhibited, the switching frequency harmonic content is reduced, and the reliability of a resolver is improved. And the rotor position angle is accurately tracked.

The embodiment of the invention provides an online answer sheet method and a question generation method, and the online answer sheet method comprises the steps: responding to a selected target component, and determining a component type corresponding to the target component; under the condition that the component type is a random switching question, determining a selected timestamp of the target component; according to the selected timestamp, a target question group is determined from a target question pool, and the target question group is used for generating a target answer sheet; and displaying the target answer sheet on an answer interface. According to the technical scheme provided by the embodiment of the invention, the maintenance cost of the system or equipment can be effectively reduced, and the answer sheet generation efficiency can be improved.

The invention provides a train operation monitoring information transmission system, and aims to solve the problems of overweight bus load, uncertainty of bus equipment transmitting and receiving opportunities and the like. A communication recording unit is provided with mutually independent data forwarding interfaces; each data forwarding interface is in independent communication connection with each functional plug-in which needs to obtain the data of the LKJ train operation monitoring system; the communication recording unit is composed of a plurality of communication recording modules which are in communication interaction through a CAN bus, and further comprises a main and standby machine switching module which is used for recording fault information of the communication recording modules. When one communication recording module fails, the host and standby switching module randomly switches to any of the other communication recording modules, records fault information of the communication recording modules, and issues the fault information of the communication recording modules; the communication recording unit further comprises an authentication module for performing identification and identity verification on each functional plug-in; when the functional plug-ins need to acquire data of the LKJ train operation monitoring system, the authentication module is in butt joint with the functional plug-ins requesting to be accessed for judgment, the judgment includes identity recognition, authentication judgment on the requests passing the identity recognition, and after the authentication is passed, the communication recording plug-in unit sends LKJ operation information to the functional plug-ins passing the authentication; and if the functional plug-ins which do not pass the identity recognition or authentication, refusing to access and forward the LKJ operation information.

The invention discloses a multi-band random switching frequency high-frequency harmonic suppression method for a permanent magnet motor, which comprises the following steps of: generating a random numbers by a linear congruence method, performing Chebyshev mapping, survival into b random numbers, forming a random number matrix with a rows and b columns, randomly extracting one number from each row, forming a group of random numbers, and generating random switching frequency; the spread spectrum range of the random switching frequency is set, the random switching frequency is divided into n sections, and the adjacent sections are partially overlapped; representing the upper and lower limits of each section of switching frequency by using the center frequency and the random number of the section, and writing an overlapping area expression of two adjacent sections according to the upper and lower limits of each section of switching frequency; the optimal solution of the harmonic dispersion coefficient is substituted into the overlapping area expression, the center frequency and the random number of each section are solved, the random switching frequency of the section is determined, and a pulse width modulation signal is obtained. The variable quantity of the adjacent switching frequencies is reduced while the occurrence probability of the center frequency is reduced, and high-frequency harmonics can be effectively suppressed.

The invention relates to the field of medical detection, and provides a sample priority switching method and device, equipment and a medium, which can query a to-be-switched sample, switch the priority of the to-be-switched sample according to the modification of a user to obtain a target sample when a signal that the user modifies the priority of the to-be-switched sample through a priority switching interface is received, and send the target sample to the user. The priority switching interface is used for assisting a user in modifying the priority of the to-be-switched sample so as to assist a detector in flexibly switching the priority of the sample according to the actual demand and issuing the target priority to a drive-by-wire, and switching information is recorded according to the target priority of the to-be-switched sample and the target priority of the to-be-switched sample. And the target samples are processed on the assembly line according to the target priorities through drive-by-wire, so that random switching of the sample priorities on the assembly line is realized, and the flexibility requirement of medical detection is met.

The invention provides a sensor network distributed filtering method and system based on adaptive event triggering under replay attack and topology switching, and relates to the technical field of signal processing. The invention aims to solve the problem that the estimation performance is reduced when the existing distributed filtering method has the problems of communication resource limitation, topology random switching, replay attack and the like in a sensor network. The method is characterized by comprising the following steps: establishing a state space model and a sensor output model of a discrete nonlinear time-varying stochastic system, and adopting a self-adaptive event triggering mechanism to enable the measurement of a distributed filter to be available; a replay attack compensation mechanism is established, and the influence caused by the replay attack on the sensor network is processed in time; the developed adaptive event-triggered distributed filter design algorithm is in a recursive form and is very suitable for online application. The method can effectively cope with multiple challenges such as bandwidth limitation, topology change and network security threats, has good applicability and practicability, and is more suitable for practical engineering application.

The present disclosure relates to a method, apparatus, electronic device, and storage medium for exploring an unknown space based on enhanced randomness. Among them, the method includes: presetting a first mode pointing to the end point and a second mode maintaining the current running direction, enabling the robot to have a simple and easy path generation method through steps such as end point determination, running mode judgment, path duplicate checking, obstacle detection, direction offset, and random switching of running modes, and realizing the rapid exploration of the unknown space by introducing the randomness of the path generation strategy. The space exploration method based on enhanced randomness in the present disclosure can be achieved only with a relatively small information processing ability, and only stores limited path-related information, and is suitable for lightweight embedded platforms.

The invention provides a double-random SVPWM (Space Vector Pulse Width Modulation) method based on an improved Markov chain. The double-random SVPWM method comprises the following steps: generating a random number by combining double chaotic mapping with the Markov chain; and respectively applying the generated random number to the random switching frequency and the random zero vector action time to realize independent control of the random switching frequency and the random zero vector action time. The random number generation structure comprises the Logistic mapping unit and the Kent mapping unit, and through connection with the Markov chain state switching device, dynamic switching is achieved, the random performance of random numbers is improved, and it is guaranteed that the random numbers are evenly distributed within the value range. The Markov chain state switching device generates complex and diverse pseudo-random number sequences according to a preset probability by controlling the state transition of the mapping unit. A random number generation method is respectively applied to a random zero vector and a random frequency in a double random modulation process, so that the spectrum distribution of the system is expanded, the concentration of high-frequency harmonics is reduced, and the electromagnetic compatibility is improved.

The invention provides a dual-random control method and system combining a dual-three-phase motor random switching sequence and a random carrier frequency. When a dual three-phase motor adopts space vector pulse width modulation, concentrated high-frequency harmonic waves exist at the switching frequency and the integral multiple of the switching frequency of phase current, and vibration noise is caused. The invention provides a double-random control method for a double-three-phase motor to suppress high-frequency harmonic waves, two different switch sequences are designed in each sector, and one switch sequence is selected through random numbers in each carrier period. And in the aspect of random carrier frequency, random number constrained variable delay control is provided, so that the carrier period is randomized, the high-frequency harmonic amplitude of the dual three-phase motor is finally reduced, and the vibration and noise of the motor are suppressed.

According to the radio frequency semi-physical simulation rotary table switching and positioning device and the operation method, a pair of longitudinal guide rails is arranged between the left end and the right end of a lathe bed, two pairs of transverse guide rails are symmetrically arranged between the front end and the rear end of the lathe bed, racks are arranged between the longitudinal guide rails and the transverse guide rails, and two three-axis rotary tables and a two-axis rotary table are arranged on the lathe bed; the three-axis rotary table and the two-axis rotary table are connected with the lathe bed into a whole through a movable seat, a transition seat is arranged between the pair of longitudinal guide rails, a pair of transition guide rails is arranged on the upper surface of the transition seat, and a transition rack is arranged between the pair of transition guide rails. According to the invention, each part is constructed by adopting mature devices in the existing market, and a set of turntable switching positioning equipment is designed by utilizing transverse and longitudinal moving guide rails, so that random switching among a plurality of sets of simulation turntables is realized, the application requirements of different test equipment are met, and the flexibility of a simulation system is greatly expanded; and meanwhile, the position of the simulation turntable can be quickly and accurately positioned, the use efficiency of equipment is improved, and the turntable switching and positioning time is greatly shortened.

The invention discloses a two-path switching data weighted average circuit and an analog-to-digital converter, and belongs to the technical field of signal processing.The two-path switching data weighted average circuit comprises a first data selector, a second data selector, a first DWA sub-circuit and a second DWA sub-circuit, the input end of the first data selector is connected with a binary input signal, and the input end of the second data selector is connected with a binary output signal; the first output end and the second output end of the first data selector are respectively connected with the input end of the first DWA sub-circuit and the input end of the second DWA sub-circuit, and the output end of the first DWA sub-circuit and the output end of the second DWA sub-circuit are respectively connected with the first input end and the second input end of the second data selector. Based on the characteristic that an input signal has randomness, according to the fact that the lowest bit of the input signal is' 0 'or' 1 ', random switching is carried out in two paths of data weighted average circuits, and spurious generation is restrained.

1. The name of the design product: the main body of the expression input graphical user interface for electronic devices. 2. The use of the design product: an electronic device. 3. The design points of the design product: the part in the graphical user interface, the part outside the dotted line is the claimed part. 4. The picture or photo that best shows the design points: design 1 front view. 5. Design 1 is designated as the basic design. 6. The use of the graphical user interface: the overall interface is used for expression input and sending; the claimed part of the interface is used for expression assembly and switching. 7. The human-computer interaction mode of the graphical user interface: in design 1 front view, the user can click the "complete" control to enter the current expression combination into the input box, long press the rounded rectangle expression card control to expand the preview switching window of the corresponding expression library, click the "structure" control to switch the card structure, and click the "random" control to randomly switch the expression combination under the current card structure. The human-computer interaction modes of design 2 and design 3 are the same as those of design 1. In design 4 front view, the user can click the "complete" control to enter the current expression combination into an input box, long press the rounded rectangle expression card control to expand the preview switching window of the appropriate expression library, click the "structure" control to switch the card structure, click the "random" control to randomly switch the expression combination under the current card structure, and click the color disc control at the bottom of the interface to select the color combination to randomly generate the expression combination with the corresponding color. In design 5 front view, when the user clicks the "+ expression combination" control, it enters design 5 interface change state diagram 1; when the user clicks the "complete" control, it enters design 5 interface change state diagram 2. In design 6 front view, when the user clicks the "+ expression combination" control, it enters design 6 interface change state diagram 1; when the user clicks the "structure" control, it randomly switches the expression card structure and enters design 6 interface change state diagram 2. In design 7 front view, when the user clicks the "+ expression combination" control, it enters design 7 interface change state diagram 1; when the user clicks the "random" control, it randomly switches the expression combination and enters design 7 interface change state diagram 2. In design 8 front view, when the user clicks the "+ expression combination" control, it enters design 8 interface change state diagram 1; when the user long presses the leftmost expression card control, it enters design 8 interface change state diagram 2. In the design 9 main view, when the user clicks the "+ emotion combination" control, enter the design 9 interface change state diagram 1; when the user long-presses the middle expression card control, enter the design 9 interface change state diagram 2. In the design 10 main view, when the user clicks the expression combination control at the lower right of the "+ emotion combination" button twice, enter the design 10 interface change state diagram 1; when the user clicks the "send" control, enter the design 10 interface change state diagram 2.

The utility model discloses a pen capable of randomly switching and displaying patterns, which comprises a penholder, a refill, a first spring and a telescopic locking mechanism are respectively arranged in the penholder, a button is movably arranged at the rear end of the penholder, the first spring is arranged between the refill and the penholder, and the rear end of the refill is in linkage fit with the front end of the button through the telescopic locking mechanism. The pen holder is further connected with a pattern random switching display device, the pattern random switching display device comprises a shell, a rotating disc and a transmission piece, the shell is connected to the outer side of the pen holder and located on the side portion of the rear end of the pen holder, the rotating disc is rotatably arranged in the shell, a plurality of patterns are arranged at one axial end of the rotating disc, the shell is provided with a window, and the transmission piece is connected with a button. And the front end of the transmission part is in transmission fit with the turntable. The pen capable of randomly switching the display patterns is simple in structure, convenient to assemble and better in holding feeling.

The application relates to a high-frequency harmonic suppression method based on a motor control system, in particular to the technical field of motor control, and comprises the following steps: S1, calculating a modulation rate according to collected motor rotating speeds; S2, comparing the collected motor rotating speeds with preset motor rotating speeds n1, and taking different modes to suppress high-frequency harmonics according to comparison results; S3, when the motor rotating speed is less than n1, a random switching frequency method is used to suppress high-frequency harmonics in an asynchronous modulation mode; S4, when the motor rotating speed is greater than or equal to n1 and the modulation rate is less than a preset modulation rate k1, a random zero vector method is used to suppress high-frequency harmonics; and S5, when the motor rotating speed is greater than or equal to n1 and the modulation rate is greater than or equal to k1, an SVPWM method is used to suppress high-frequency harmonics. Different harmonic suppression modes are set according to different scenes, and the efficiency of suppressing harmonics is effectively improved.