64 results about "Wave phenomenon" patented technology

The invention belongs to the field of the body area network and relates to a gait recognition method based on an inertial sensor. The method includes four phases. In the data acquisition phase, four sensor nodes attached to legs of a testee and a sensor node attached to the waist of the testee are used to acquire motion angular speeds, accelerations and magnetic field strengths of the legs and waist of the body of the testee and wirelessly transmit data to a base station, and then the data are transmitted to the upper computer for processing. In the period dividing phase, gait periods are divided according to angular speed change curves of the shanks so as to obtain segment data corresponding to gaits. In the feature extraction phase, waveform features and behavioral features are extracted from the segment data and used to describe fluctuation of sensor signals and sport performance of gait behaviors. In the gait classification phase, the gait features are transmitted to a classifying model, types of the gaits are acquired by computing, and thus gait recognition is achieved. The method is suitable for use in gait recognition in the fields, such as sports training, medical care and game design.

The invention provides a method for implementing a parallel power system stabilizer (PSS). The parallel PSS of the invention divides compensation frequency domain of the existing PSS into two sections and compensates the compensation frequency domain by two compensation branches respectively, wherein, in one compensation branch, a gain regulating link is used for improving the amplitude of a high-frequency section, while in the other compensation branch, a lag compensation parameter is used for solving the shortage of compensation in a low-frequency section. As the same as the existing PSS, the parallel PSS of the invention can improve the stability of the small perturbation of the system and inhibit the low-frequency oscillation in an interconnected system. Compared with the existing PSS, the parallel PSS of the invention improves the phase-frequency characteristic of the low-frequency section and the amplitude-frequency characteristic of the high-frequency section, thereby widening the working frequency domain of the parallel PSS of the invention, and inhibiting the reactive power fluctuation while the system is in normal operation.

The invention provides a method for generating an output indicative of acoustical sound transmission in a room. By using e.g. a point cloud representation of an acoustic environment, it is possible to calculate its acoustics from the interior information obtained from the depth camera. This approach is suitable e.g. for run-time applications since it is not based on an audible excitation that can disturb running audio. Also, the point-cloud model can be updated in real time according to the scene changes detected by depth-camera. This allows efficient acoustical simulation of dynamic, interactive environments. Although only geometrical information of a room is provided, high amount of surface details leaves possibility for implementation of material recognition algorithms that involve semantic mapping. This can provide information of reflective properties of surfaces or objects at a point level. Also, a high amount of details allows a good approximation of complex geometries, e.g. porous materials, and rough surfaces, thus a more natural simulation of wave phenomena like diffraction and scattering is possible.

The invention discloses a method for measuring the content of powdery substantial elements based on laser-induced breakdown spectroscopy, belonging to the field of atomic emission spectroscopy. characterized in that: a powdery sample is put on a transparent glass pallet, laser is focused onto the bottom of the powder through the glass pallet to generate plasmas, radiant light signals emitted by the plasmas pass through the glass pallet and are collected by a collecting lens arranged below the glass pallet, and the collected radiant light signals are transmitted to a spectrometer through optical fibers for analyzing. According to the invention, there in no need of compression molding of the powdery sample, thus the speed of on-line detection is raised; in addition, the measuring signal fluctuation caused by the unevenness of the powder layer surface is overcome, and the repeatability of the measurement is raised.

The invention discloses a light emitting diode display screen, wherein a light emitting diode naked chipset is stuck on the front surface of a printing circuit board, and the outer side of the light emitting diode naked chipset is equipped with an integrated encapsulated sticking membrane. The invention further discloses an encapsulated method of the light emitting diode display screen. Because the light emitting diode display screen uses a special device to do a patch treatment of the light emitting diode naked chipset, simultaneously, the encapsulated sticking membrane is an integrated body, the leveling of the light emitting diode display screen which is obtained by the method is observably improved, a wave phenomenon can be avoided to produce when words or images are displayed, and the color of the display screen also can have a higher consistency.

The invention relates to a signal extracting method, and belongs to the field of dynamic balance measurement. An extraction method of an unbalanced signal for the dynamic balance measurement is characterized by comprising the following steps of: (1) conditioning and filtering a vibration signal transmitted by a vibration sensor and performing fast Fourier transform (FFT) operation on the filtered signal to acquire signal amplitude values at different frequency points, searching a signal component near the frequency of the unbalanced signal in an operation result, judging whether the signal has near-frequency interference or not, and if the signal has the near-frequency interference, estimating a beating wave period of a beating wave phenomenon which occurs after the interference according to an FFT result; (2) extracting the unbalanced signal by using data in the beating wave period as a sample by a sine approximation method; and (3) if the signal does not have the near-frequency interference, extracting the unbalanced signal by a full period data sampling-based orthogonal correlation method. By the method, the stability and the reliability of the dynamic balance measurement are improved, the measurement range of a dynamic balance measurement system is enlarged, and the measurement accuracy of the system is improved.

The invention discloses an electromagnetic incremental forming method. The electromagnetic incremental forming method adopts a hierarchical manner to realize layer-by-layer forming from the bottom up; only a local position is formed during each forming, so that a die fittingness range is expanded continually till the forming of a whole workpiece is completed; then shaping is realized to improve the forming quality of a sheet; finally, a housing part which is uniform in thickness distribution and good in surface quality is obtained. Shaping can be realized through an orthotic coil or the orthotic coil and a magnet collector. According to the method, after hierarchical forming, the fluidity of sheets is improved, and a local thinning phenomenon is prevented; meanwhile, a sheet waving phenomenon, which is caused by instability wrinkling, in an electromagnetic incremental forming process can be prevented, so that the electromagnetic incremental forming precision is improved; as the fluidity of the sheets is improved after hierarchical forming and the local thinning phenomenon is prevented, the forming of housing parts with uniform wall thickness is facilitated.

The invention discloses a finite element method for precisely simulating transmission line waving through an ANSYS software. According to the finite element method, beam elements with a bending freedom degree under condensed local coordinates are adopted to simulate sub-wires of a transmission line assisted with the characteristic that stress mentoring guarantee cables only have tension; meanwhile, multiple connection modes of the sub-wires and spacers are considered, three-component aerodynamic parameters of all the sub-wires under a full-blast attack angle are precisely acquired through an icing split gas aerodynamic characteristics wind tunnel test, and then an APDL is compiled to directly load aerodynamic loads relevant to motion states; and last, precise waving simulation is realizedthrough nonlinear iteration solving. Through the finite element method, an icing multi-split transmission line waving phenomenon can be precisely reproduced, the application range is wide, and complicated anti-waving measures can be taken based on the simulation method.

The invention discloses an indirect prediction method for the remaining life of a power battery. With equal charge voltage rise time and equal discharge voltage drop time as characteristic health factors, a time sequence for characteristic health factors and cycle times is built; global degradation and local fluctuation are decoupled by empirical mode decomposition, particle filtering and polynomial regression are combined to predict the remaining life of the battery, wherein the particle filtering is used for tracking a local fluctuation phenomenon, and the polynomial regression is used for fitting a global degradation trend. Experiment results show that the errors between the prediction result in the method and lithium battery cycle life experiment data from an NASA Ames superior prediction center are within 4%, and good accuracy and good practicability are achieved.

The invention discloses an experimental device for research on rock high temperature thermal rupture under stress effect, the experimental device includes a heating system, a rock core holding system, a crack detection system and a temperature measurement system. The heating system is used for continuous heating of rock core to create high temperature conditions; the rock core holding system is used for applying horizontal stress to the periphery of the rock core for simulation of the formation confining pressure effect and meanwhile to play the role of fixing the rock core to prevent the occurrence of loosening; the crack detection system is used for amplifying and processing vibration wave signals sent from the inner part of the rock core and recording structure changes of the inner part of the rock core so as to determine the rock core fracture time and fracture position; and the temperature measurement system is used for recording the rock core rupture temperature. Aiming at the structure changes occurring in the inner part of the rock core at high temperature, real-time dynamic observation of the thermal rupture caused by rock heating can be realized. The experimental device has strong practicability, can be used for analysis description of the structure changes occurring in the inner part of the rock core during observation of vibration wave phenomenon, and an effective experimental method is provided for research on rock rupture during rock thermal exploitation process.

An exemplary liquid crystal display device (1) includes a liquid crystal panel (11) and a backlight module (12) disposed adjacent to the liquid crystal panel. The backlight module includes a frame (18) having a plurality of holes (182), an optical sheet (14) disposed in the frame, and a light shielding sheet (13) disposed between the liquid crystal panel and the optical sheet. The light shielding sheet is frame-shaped, and includes a plurality of outer walls (134) having a plurality of protrusions (136) formed on the outer walls. The protrusions are respectively corresponding to the holes of the frame, and each of the protrusions extends in a direction away from a center of the light shielding sheet. The liquid crystal display device is convenient for disassembly and can avoid a waving phenomena caused by an adhesive used in a conventional liquid crystal display device.

The invention discloses a zinc cathode material, which consists of zinc cathode active material and selected conductor, wherein the cathode material also contains calcium-phosphorus compound with even particle diameter not more than the even particle diameter of zinc cathode active material. The zinc cathode material has deformation-proof property, which inhibits the fluctuating phenomenon of discharge capacitance of battery effectively with fluctuating amplitude less than 50 mAh. The invention can improve the large current discharge property to make SC typed battery discharge under 30A, which makes the discharge capacitance reaches over 80% normal capacitance.

The invention provides a charge pump device which comprises a charge pump, a voltage-stabilizing capacitor and a module, wherein the charge pump precharges the voltage-stabilizing capacitor in a write operation preparation stage; the voltage-stabilizing capacitor is connected with the charge pump through the switchover control module; and the switchover control module controls the connection and disconnection of the voltage-stabilizing capacitor and the charge pump. Correspondingly, the invention also provides a voltage-stabilizing method of the charge pump device, and the charge pump device comprises the charge pump and the voltage-stabilizing capacitor. The voltage-stabilizing method comprises the following steps: precharging the voltage-stabilizing capacitor at the write operation preparation stage; disconnecting the voltage-stabilizing capacitor and the charge pump to promote the voltage of the charge pump when a web signal is at low electrical level; and connecting the voltage-stabilizing capacitor and the charge pump when the voltage of the charge pump is promoted to a reference voltage. The rising time of output voltage and ripple wave phenomenon of the charge pump can be optimized simultaneously, under the condition of not influencing the reduction of ripple wave phenomenon, the rising time can be reduced, thereby improving the integral performance of a storage system.

The invention provides a photovoltaic power plant string anomaly alarming method, which comprises the following steps: A, the historical data of each combiner box in a point station are extracted, thecurrent values of all strings in the combiner box are subjected to abnormal state judgment, and a state matrix for all strings is saved; B, the abnormal current values in the state matrix are extracted, periodic analysis is carried out, shadow occlusions are classified and marked according to a periodic analysis result, and based on the marked result, a device image is completed; and C, whether current of all strings under each combiner box is abnormal is judged in real time, if current of a certain path of string is abnormal, the device image of the string in the combiner box is extracted, and based on the comparison result between the abnormal moment and the device image, whether to be reported as a fault is judged. On the basis of automatically judging the fault state of each string, aperiodic abnormal fluctuation phenomenon caused to the string by the shadow occlusion can be effectively avoided through the device image technology, and the alarm accuracy is improved.

The invention discloses a method and device for preventing wavelength of an emitted light from being fluctuated during power-up of an optical module. When the optical module is powered up, a controller only sends a first turn-on instruction to a TEC control circuit, so as to control a TEC to be turned on. The controller determines delay time according to a temperature difference between temperature of an emitting laser and a target temperature value and sends a second turn-on instruction to the emitting laser when turn-on wait time of the emitting laser reaches the delay time, so as to controlthe emitting laser to be turned on. At the moment, temperature of the emitting laser when starting to emit light is almost close to or equal to the target temperature value, temperature change is small, wavelength of the light can not be fluctuated or produced fluctuation is relatively small, then the laser can be protected from being interfered by temperature fluctuation, and laser can be emitted as quickly as possible. Therefore, the method and device which are provided by the invention not only can avoid light wavelength fluctuation phenomenon and protect the emitting laser but also can enable the optical module to output light with stable wavelength as quickly as possible, and standards of the optical module are met.

The invention belongs to the field of electroluminescence devices and discloses an inverted bottom-emitting organic electroluminescence device and a manufacturing method thereof. The device comprises a cathode substrate, an auxiliary electronic transmission layer, a first electronic transmission layer, a light-emitting layer, a hole transporting layer, a hole injection layer and an anode layer which are sequentially stacked. The auxiliary electronic transmission layer is made from a doped mixed material formed by doping 1-5% by mass of thiophene polymer into 4,7-diphenyl-1,10-phenanthroline, 1,2,4-triazole derivative or N-aryl benzimidazole. The inverted bottom-emitting organic electroluminescence device can avoid an excitor and metal electrode surface plasmon polariton wave phenomenon, meanwhile enhance light scattering and the front-side luminous intensity and greatly improve the luminous efficiency.

The invention discloses a position estimation method of an ultrasonic elastography one-dimensional axial displacement estimation window, which comprises the following steps of: 1, setting an initial position of the center of the one-dimensional axial displacement estimation window as a displacement estimation sampling point; 2, generating a position coordinate of the one-dimensional axial displacement estimation window by using an iteration method; 3, using a coordinate generated by iteration as a coordinate of a center point of the displacement estimation window, and taking the one-dimensional window with the point as the center for carrying out axial displacement estimation; and 4, carrying out gradient operation on a displacement estimation value to generate an elastic image. According to the invention, by adopting a new position estimation algorithm of the one-dimensional estimation window, the displacement estimation is carried out on the two-dimensional estimation window so that a more accurate displacement of a preset sampling point can be generated, and the influence of signal amplitude random fluctuation and signal compression to displacement estimation is avoided, therefore, amplitude modulation noise of elastography is effectively inhibited, strain texture fluctuation is avoided being caused, and the elastography quality and quality are improved.

The invention discloses an online monitoring method of pulse injection type line oscillation, which belongs to the field of online monitoring of overhead transmission lines of an electric system, and relates to a pulse injection-based research method for the online monitoring of the overhead transmission lines of the electric system. The method mainly comprises the following steps of: injecting a 10ns pulse signal from the tail end of a capacitive voltage transformer; transmitting the pulse signal on an extra-high voltage line, wherein when the line generates low-frequency oscillation along with wind, the capacitance of the line is changed, then the wave impedance is changed to make the pulse signal along the line generate corresponding fluctuations; and according to the signal fluctuations, judging the position of the line oscillation, the oscillation frequency, the oscillation amplitude value and the like. The research method is relatively novel, is reasonable in design, is easy to implement, and has wide popularization and research values in the field of the online monitoring of the overhead transmission lines of the electric system.

A passive leakage device for an axial turbomachine, more particularly for a low-pressure compressor of an axial turbomachine, is adapted to reduce and/or eliminate the surging phenomenon within the machine. The passive leakage device includes an insert having a general cylindrical shape with a flange at one end and a bottom or membrane at the other end. The membrane comprises two cross-shaped notches, the notches being adapted to enable a deformation of the membrane under a pressure exceeding a predetermined threshold, so as to allow a leakage to go through the membrane. Several inserts are arranged through the wall of a compressor casing, distributed over one or several circumferences of the casing, facing one or several rows of rotor blades. In the case of a double-flow turbomachine, such as a jet engine, the beak for separating the primary and secondary flows is used to form a chamber for communication between the inserts and for compensation with the pressure present in the secondary flow.