49results about How to "Close to practical application" patented technology

The invention discloses a system and a method for controlling a range hood capable of outputting constant air volume. The system comprises a controller; the controller is connected with a user control panel, a speed sensor, a current sensor and a storage, wherein the user control panel is used for enabling a user to input the initial air volume Qu; the speed sensor is used for detecting the actual speed n of a motor; the current sensor is used for detecting the actual current i of the motor; the storage is used for storing data such as the speed N, the current I, the static pressure P and air volume Q; the air volume is directly proportional to the speed; the static pressure is directly proportional to the square of the speed; the current is directly proportional to the cube of the speed. Through the judging whether the air volume Q is within the difference value delta Q range or not, the actual speed N is adjusted to change the air volume Q to achieve the purpose that the range hood can output constant air volume.

The invention relates to a dynamic spectrum access method with a network cognition ability, belonging to the technical field of wireless communication. The dynamic spectrum access method comprises the following steps of: (1) channel allocation: available spectra are segmented into a series of frequency bands, the frequency bands are different in bandwidth and transmitting ranges, and the frequency bands are channels; each channel is completely orthogonal, and a secondary user can use multiple channels at the same time; when several users use the same channel at the same time within a certain range, conflicts and interference occur; and the positions of all users are permanent; (2) channel access: in a cognitive wireless network, the secondary users fully utilize channels not used by primary users, i.e. the secondary users take full advantage of idle time slots of channels allocated to the primary users; and the primary users using the channels do not take the existence of the secondary users into account by using a second-order Markov Model; and (3) channel switching.

The invention discloses a feedback system based on a motor imagery brain-computer interface. The feedback system comprises a feedback module, an electroencephalogram collector, a wireless transmission module and a terminal device; the feedback module is used for compiling a feedback interface; the electroencephalogram collector is used for collecting an electroencephalogram signal associated with motion; the electroencephalogram signal is amplified and filtered by the electroencephalogram collector after scalp electrode detection and is transmitted to the terminal device by the wireless transmission module; and the terminal device is used for carrying out data processing on the electroencephalogram signal to extract a motor imagery characteristic signal, and the motor imagery characteristic signal is used for forming visual feedback after mode identification and controlling the feedback interface to form a closed loop control system. Compared with the traditional MI-BCI system, the feedback system disclosed by the invention better conforms to a normal thinking action control process and approaches to actual interactive application, thereby being expected to provide critical technological guarantee for novel MI-BCI. The feedback system disclosed by the invention can be applied to the fields of disabled rehabilitation, electronic entertainment, industrial control, aerospace engineering, etc.

The invention discloses a positioning method based on arrival time of unknown starting time in the non-line-of-sight environment. The method comprises steps of firstly establishing a model of a signal transmission distance between a target source and each sensor; obtaining a description of the measurement noise based on the model; according to the description of the measurement noise, using the robust weighted least squares method under the worst case to obtain the positioning problem in the environment of unknown signal transmission start time and non-line-of-sight errors, and converting the positioning problem into a non-convex positioning problem; by introducing auxiliary variables and using the second-order cone relaxation method, obtaining a second-order cone programming problem; and finally, using the interior point method to solve the second-order cone programming problem to get the final estimation value of the coordinate position of the target source in the reference coordinate system. The method has the advantages of being capable of simultaneously solving the problems of the unknown signal transmission start time and the non-line-of-sight errors so as to improve the positioning accuracy.

The invention discloses a machining process-oriented mobile robot system calibration method and system. The method comprises steps of constructing different coordinate systems based on a laser tracker; constructing an omni-directional moving platform coordinate system, a robot base coordinate system, a robot tail end flange coordinate system and a to-be-machined workpiece coordinate system througha laser tracker; performing robot kinematics parameter identification based on the laser tracker; measuring target points of a robot under different poses through the laser tracker, establishing a kinematics parameter model, and identifying kinematics parameters; calibrating the motion pose of the robot; correcting the operation parameters of the robot by adopting the calibrated motion parametersso as to calibrate the motion pose of the robot; moving the robot to different stations; performing coordinate system conversion relation calibration based on the laser tracker; measuring a space point target point through the laser tracker, and adopting an improved weighted singular value decomposition algorithm to realize calibration of the coordinate system conversion relationship; performinga machining program, and guaranteeing the correct mobile robot machining process.

In order to overcome the defects of overlarge hardware cost and power consumption and unsuitable integration in a wireless sensor network node in the design of a plurality of prior AES coprocessors, the invention provides a module reuse method in AES coprocessors apply for wireless sensor network node. The method mainly utilizes the multiplexing technology and process optimization to finish an encrypting and decrypting function by fewest submodules. The AES structure process adopts multiplexing ways of internal turn resource share, each high level module multiplexing submodules and external turn single cycle and can encrypts / decrypts. The invention can reduce application cost and hardware expenditure and effectively lower power consumption on the basis of ensuring reliable data, and the system throughput rate also conforms to the requirement of a wireless sensor network and is suitable for using VLSI hardware. In the special application of the wireless sensor network node, an AES encrypting and decrypting coprocessor in the structure can be closer to practical application as supplying the reliable data.

The invention relates to a method for mix design of a hot-mix asphalt mixture produced with an intermittent mixer and is characterized in that: the process mix design method comprises the following steps of: mineral mix design, Marshall test, determination of optimal asphalt dosage or oil-stone ratio, mix design test, correction of optimal asphalt dosage or oil-stone ratio and determination of final process mixing proportions of minerals. The step of mineral mix design comprises the procedures of determining initial proportions and designing mineral mixing proportions. The mix design method provided by the invention maintains consistency between process mix design and target mix design, and achieves quantization and visualization of the comparison between process mix design and target mix design. The mix design method effectively prevents the problem of material overflow, reduces loss, increases the running efficiency of equipment, reduces the consumptions of asphalt and mineral powder, ensures the construction quality and reduces the construction cost.

The invention discloses a design method for a high speed pantograph multiple-target robust Hinfinity controller. The method comprises the following steps: establishing a nonlinear pantograph-contact wire system model; establishing a single overhead line system model; establishing a pantograph-contact wire system state-space model; designing a multiple-target robust Hinfinity controller. The establishment of the pantograph-contact wire system state-space model is the basis for calculating a state feedback gain matrix; the random measurement loss has strong practical significance, so that the control on the initiative control force and pantograph bow lifting volume is necessary on the basis of consideration for the practical application; the pantograph-contact wire system is complex in running environment and is easily disturbed by the external environment and the model possibly has a modeling error, so that the application of the robust controller can guarantee the stability and robustness of the system; the method provided by the invention has better control performance and practicability.

The invention discloses a robustness weighted least square positioning method in a mixed environment based on arrival time, and the method comprises the steps: building a reference coordinate system in a wireless sensor network; describing a signal transmission distance between a target source and each sensor in a mode of a sight distance model and a mode of non-sight-distance model; obtaining a positioning problem in the mixed environment based on the arrival time according to the sight distance model and the non-sight-distance model through employing the robustness weighted least square method under the worst condition, and obtaining a non-convex positioning problem; introducing an auxiliary variable to the non-convex positioning problem, employing a second-order cone relaxing method, and obtaining a second-order cone planning problem; finally solving the second-order cone planning problem through an interior point method, and obtaining a final estimation value of the coordinate position of the target source in the reference coordinate system. The method is advantageous in that the method gives full consideration to the two states: sight distance and non-sight-distance, makes the most of path state information, achieves the targeted processing of the non-sight-distance error, and is high in positioning precision.

The invention relates to a poor student subsidization recommendation method based on school behavior data multidimensional analysis. Compared with the prior art, the method solves the defects that theaccurate recommendation of a poor student to be subsidized is difficult in realization. The method comprises the following steps that: obtaining historical behavior data; extracting the features of the historical behavior data; training a recommendation model; obtaining behavior data to be analyzed; extracting the features of the behavior data to be analyzed; and obtaining a recommendation result. By use of the method, on the basis of the school data generated by the student, the features of multiple dimensions are extracted, the features are used for establishing a classification model, anda poverty situation of the student can be accurately judged by virtue of the classification model, and a decision is made.

The invention belongs to the technical field of image processing, and particularly discloses a hyperspectral image group sparse demixing method based on empty spectral information abundance restraint. The method comprises the steps of inputting a hyperspectral image data set and a standard spectrum bank, conducting adaptive grouping on hyperspectral image data with the mean-shift algorithm, conducting group sparse demixing on each group of hyperspectral image data, trimming the spectrum bank with the abundance matrix of each group of hyperspectral image data as the criteria, and outputting a hyperspectral image data sparse demixing result. According to the method, the structural features of hyperspectral data and spectrum bank data are considered, group sparse demixing and spectrum bank trimming are adopted for hyperspectral image demixing, and hyperspectral data sparse demixing precision is improved. The semi-supervision-based hyperspectral image demixing method has the advantages of sparse demixing and is high in demixing precision and effective.

The invention discloses a solar spectrum simulation light source. The light source is formed by a seat body, a halogen tungsten lamp installed on the seat body, an LED white lamp, an LED green lamp and an LED ultraviolet lamp. The LED white lamp, the LED green lamp and the LED ultraviolet lamp form LED lighting set series. The light source has a simple structure. A design is reasonable. Through organically combining the light emitted by the halogen tungsten lamp, the LED white lamp, the LED green lamp and the LED ultraviolet lamp, compared to a xenon lamp spectrum line, a mixed spectrum line is more similar to a solar spectrum line. The solar spectrum can be well simulated. The mixed light source, which accords with practical applications, can be used for making a sun simulator.

The invention discloses a device and a method of measuring the shielding effectiveness of a communication cable joint shielding cover. The device comprises an analog signal generating unit, a to-be-measured shielding cover unit, a signal amplifying and transmitting unit and an electromagnetic signal detecting unit, wherein the analog signal generating unit simulates and generates the frequency andthe waveform of signals transmitted in a cable core, and sinusoidal and square wave signals are generated; the to-be-measured shielding cover unit is configured to be the to-be-measured cable joint shielding cover; the signal amplifying and transmitting unit is configured to be arranged in the shielding cover, the signals generated by the analog signal generating unit are amplified and transmitted to the surrounding space, and electromagnetic signals radiated outwards during cable operation are simulated; and the electromagnetic signal detecting unit is configured to measure three axial electric and magnetic fields in space separately, the intensity of the electromagnetic field at a fixed frequency point can be measured independently, and through applying radiated electromagnetic signalsto an analog cable and measuring electric and magnetic fields in different directions at different positions of the cable, the shielding effectiveness of the cable joint shielding cover can be measured.

The invention discloses a target detection method under an array ground wave radar sea clutter background based on correlation characteristics. The method comprises the following steps: selecting a coherent accumulation time parameter for correlation detection, performing pulse compression on multi-channel time domain data received by each array element of an array ground wave radar, and performing coherent accumulation to obtain a channel-distance-Doppler spectrum; calculating correlation values of a multi-channel-distance-Doppler spectrum along a distance dimension and along a Doppler dimension; determining a detection threshold; and finally, outputting a target position by adopting a method of channel-distance dimension detection and channel-Doppler dimension two-dimensional composite detection plus extreme value detection. According to the target detection method disclosed by the invention, the dependence on the identification of sea clutter, noise and other regions is reduced, anaccurate background clutter model is not needed, the detection of targets in the sea clutter is effectively realized, which is difficult to achieve by conventional amplitude threshold detection, the adverse effect of a noise base in a ground wave radar distance-Doppler spectrum on correlation calculation is eliminated, and the target detection method is closer to practical application by utilizingthe self-contained information of a radar echo object.

The invention discloses a built-in blade motor type energy recovery absorber. The built-in blade motor type energy recovery absorber mainly comprises a cushion cylinder, a piston, a motion conversion mechanism and a generator; the cushion cylinder comprises a cylinder body and a hollow piston rod, the piston consists of a blade motor, an upper sealing plate and a lower sealing plate, the piston is built-in in a cylinder body, and the cylinder body is divided into an upper oil cavity and a lower oil cavity. When an automobile vibrates on uneven roads in a driving process, the pressure of the upper oil cavity and the lower oil cavity is unequal to cause a pressure difference; oil in a high pressure cavity flows to a low pressure cavity through a piston, blades in the piston are pushed to rotate, and the motion conversion mechanism is used for converting two-way rotation of the blade motor into single rotation, so as to drive a generator to power and recover the vibrating energy in an electric energy way. The built-in blade motor type energy recovery absorber provided by the invention is simple in structure, the vibrating energy of the automobile can be effectively recovered, and the fuel oil consumption of the automobile can be reduced.

The invention discloses a multi-base sonar positioning method based on a signal arrival time difference, and the method comprises the steps: building measurement models of two conditions through considering the assumption that the real propagation speed of a signal is a known distributed random variable and the real propagation speed of the signal is completely unknown; converting the measurementmodels of the two conditions into a linear relation equation, arranging the linear relation equation into a matrix form, and converting the matrix form into a weighted least square problem; convertingthe weighted least square problem of the two conditions into a non-convex constraint optimization problem, relaxing the non-convex constraint optimization problem into an easy-to-process convex problem, and adding additional constraints to tighten the problem; solving the tightened convex problem under the two conditions to obtain an optimal solution of the to-be-optimized variable so as to obtain preliminary estimated values of the target position under the two conditions; optimizing again by utilizing the preliminary estimated values to obtain a final estimated value; the method has the advantage of good target positioning performance.

The invention provides a spectrum auction method based on imperfect spectrum detection in CoMP system. The method comprises the following steps: S10, the primary stage, which comprises the following processes: performing static cell clustering in the CoMP system, selecting a fixed cooperative cell set of multiple cells, and setting cooperative user equipment in each cooperative cell as multiple; S20, the spectrum detection stage, which comprises the following processes: performing idle spectrum detection by use of a cognitive spectrum sensing technology, and collecting idle frequency band to perform the auction preparation; S30: the auction stage: establishing a spectrum auction model based on imperfect spectrum detection, designing a purchaser, a seller and a spectrum broker, optimizing a purchaser revenue function, and selling the idle frequency band at auction in the time slot by use of a first price sealed auction scheme. By use of the method provided by the invention, the spectrum utilization efficiency of the CoMP system is improved, and then the overall throughput of the system is improved.

The invention discloses a position prediction method based on automatic completion, which comprises the following steps of S1 acquiring a spatio-temporal data set of a preset time period; S2 extracting spatio-temporal topics with common spatio-temporal characteristics; 3 selecting a training data set, training and obtaining a multi-class classifier; S4 converting the historical spatio-temporal data of the object to be predicted into spatio-temporal topic series arranged in time order; 5 predicting the future spatio-temporal theme of the current spatio-temporal theme of the object to be predicted or the spatio-temporal theme of the next few; S6 taking the position in the historical spatio-temporal data of the object to be predicted and the position of other users under the given future spatio-temporal topic as a position candidate set, obtaining the probability of each candidate position in the position candidate set, and taking the candidate position with the highest probability as thefuture position of the object to be predicted. The method of the invention considers that the human behavior mode has the characteristics of diversity and individuation, is closer to the practical application, and has better prediction accuracy and high prediction efficiency.

The invention discloses a clutch meshing pressure self-learning method of a double-clutch gearbox. The method includes: acquiring an expected pressure value of a clutch, outputting a control signal according to the expected pressure value to control an electromagnetic valve to apply pressure on the clutch, and testing an actual pressure value; when a difference of the actual pressure value and theexpected pressure value exceeds a preset range (like when the difference is increased suddenly), storing the actual pressure value; repeating the above steps, and storing multiple actual pressure values to form a sequence, wherein an average value of the actual pressure values in the sequence is the clutch meshing pressure self-learning value. By the method, the accurate clutch meshing pressure self-learning value can be acquired; the learning result is more stable and closer to actual application. In addition, the method can reduce calibration workload, thereby having obvious actual operation advantages.

The invention discloses a positioning method in a mixed sight distance and non-sight-distance environment based on received signal strength. The positioning method comprises the following steps: constructing a model for the signal intensity of a measurement signal received by a receiving sensor; converting the model by introducing balance parameters of extra loss caused by non-line-of-sight errorsso as to obtain a corresponding first-order Taylor expansion expression and a corresponding first-order Taylor simplification expression; constructing a robust weighted least square problem accordingto the first-order Taylor simplified expression; utilizing an approximate relation, an upper mirror image method and an S-Lemma theorem, introducing an error upper bound of extra loss, and convertingthe error upper bound into a robust weighted least square simplification problem; converting a robust weighted least square simplification problem into a positive semidefinite programming problem byusing a convex relaxation method; and solving the positive semidefinite programming problem to obtain an estimated value of the coordinate position of the target source. The method has the advantagesthat the problem that non-line-of-sight errors exist in the measurement environment can be solved, and therefore, the positioning precision can be improved.

The invention provides a method of calibrating a transmission line aeolian vibration online monitoring device. The method comprises steps: 1, the transmission line aeolian vibration online monitoring device is connected with a measuring standard device; 2, the vibration excitation frequency and the vibration excitation amplitude outputted by the measuring standard device are set; and 3, the measuring value of the transmission line aeolian vibration online monitoring device is acquired, and the measuring value and the actual output value of the measuring standard device are compared. The method of calibrating the transmission line aeolian vibration online monitoring device provided by the invention has the advantages that the actual working condition of the transmission line aeolian vibration online monitoring device can be simulated to the maximum degree, and data measured by the transmission line aeolian vibration online monitoring device are closer to actual application compared with relative vibration data by an acquisition unit relative to a mounting interface.

The invention relates to a natural gas gathering and transportation pipeline leakage simulation device and method. The simulation device comprises a simulation pipeline which is provided with an air inlet, an emptying port and at least one leakage hole; an air supply system; an emptying system; and a plurality of sensor unit groups respectively arranged at the leakage hole and two sides of the leakage hole along the axial direction of the simulation pipeline, wherein the group comprises a plurality of sensor unit rings which are sequentially arranged at intervals along the radial direction, and each sensor unit ring comprises a plurality of sensor units which are arranged around the circumference of the simulation pipeline; wherein the sensor unit includes at least one of a temperature sensor and a concentration sensor. The sensor units are arranged in a space near the leakage hole according to a specific mode to form a leakage monitoring area near the leakage hole, and the sensor units can select temperature sensors and / or concentration sensors according to test requirements, so that a three-dimensional temperature field and / or a toxic gas diffusion field near the leakage hole are / is monitored; and the selection of the monitoring technology is guided.

The invention relates to an antenna-by-antenna power robust optimization method based on an NOMA system, and the method comprises the following steps: S1, building a constraint optimization target problem of the NOMA system, wherein the constraint optimization target problem comprises an antenna-by-antenna power minimization model and the quality constraint of robust user service; S2, converting the robust user service quality constraint into a quadratic matrix inequality, and converting a constraint optimization target problem into a positive semidefinite programming problem; and S3, solving the positive semidefinite programming problem to obtain an optimal solution or a sub-optimal solution of the positive semidefinite programming problem. According to the scheme, the antenna-by-antenna power model is established, the quality constraint of the robust user service is given, then the S lemma and the positive semidefinite technology are applied to convert the optimization problem into the positive semidefinite planning problem, and finally the positive semidefinite planning problem is solved, so that the optimal solution or the sub-optimal solution of the original problem is rapidly solved, the robustness of the system is improved, and the system is closer to practical application.

The invention discloses a method for generating a single-carrier digital modulation interference signal and an interference case library, and belongs to the technical field of wireless communication interference. According to the method, a binary single-carrier digital modulation signal is taken as a research object, and an interference signal of the signal under an additive white Gaussian noise channel and a generation method of an interference case library are researched. The method is realized by an interference signal generation system, and the system comprises an interference signal generation module, an interference case library and an interference decision module. According to the system, an interference signal capable of enabling the bit error rate of a single-carrier digitally modulated communication signal to be actually effective is generated through an interference signal generation module; communication signal parameters are changed, generated interference signals are input into an interference case library to be accumulated, finally, interference signals suitable for existing interference equipment resources are output through an interference decision module accordingto enemy communication signals intercepted by the jammer, and the interference signals are closer to actual application occasions.

The invention belongs to the technical field of image processing, and particularly discloses a hyperspectral image group sparse demixing method based on empty spectral information abundance restraint. The method comprises the steps of inputting a hyperspectral image data set and a standard spectrum bank, conducting adaptive grouping on hyperspectral image data with the mean-shift algorithm, conducting group sparse demixing on each group of hyperspectral image data, trimming the spectrum bank with the abundance matrix of each group of hyperspectral image data as the criteria, and outputting a hyperspectral image data sparse demixing result. According to the method, the structural features of hyperspectral data and spectrum bank data are considered, group sparse demixing and spectrum bank trimming are adopted for hyperspectral image demixing, and hyperspectral data sparse demixing precision is improved. The semi-supervision-based hyperspectral image demixing method has the advantages of sparse demixing and is high in demixing precision and effective.

The invention belongs to the technical field of wireless communication, and discloses a dynamic bidirectional spectrum allocation method for resisting Sybil attack of a primary user and an intelligentterminal, and aims to defend against innovative Sybil attack of the primary user so as to dynamically correspond to a bidirectional anti-strategy control spectrum auction model for quoting accordingto a flexible and real estimation value and determine a bidding relationship between the primary user and a secondary user in the model. Spectrum auction is carried out through a specific bidding strategy; an auction theory and an auction mechanism are adopted to prevent Sybil attacks of a primary user, and spectrum auction is carried out on line through a bidding strategy. According to the method, auction models in economics are integrated, and an online dynamic spectrum auction mechanism capable of meeting the flexible requirements of secondary users for channels and resisting Sybil attacksof bidding is designed; through the mechanism, the primary user and the secondary user can bid the spectrum by submitting different requirements of the users for the spectrum and corresponding estimation functions, Sybil attacks of illegal primary users are prevented, and a better spectrum sharing mechanism is realized.

The invention discloses a range hood control system with constant air volume output and a control method thereof, comprising a controller connected with a user control panel for the user to input the initial air volume Qu, and a rotational speed for detecting the actual rotational speed n of the motor Sensors, current sensors for detecting the actual current i of the motor, memory for storing data such as speed N, current I, static pressure P, and air volume Q, where the air volume is proportional to the speed, and the static pressure is proportional to the square of the speed. The current is proportional to the cube of the rotational speed. By judging whether the air volume Q is in the difference range △Q, the actual speed N is adjusted to change the air volume Q to achieve the constant air volume output of the range hood.