36results about How to "Ease of engineering practice" patented technology

The invention is applicable to the technical field of near field communication and provides a touch screen and a terminal integrated with an NFC antenna and a near filed communication method thereof. The touch screen comprises a substrate, wherein the substrate is provided with a touch sensing area; touch sensing electrode patterns are distributed in the touch sensing area; a single-turn conductive wire is distributed on the outer side of the touch sensing area; the conductive wire as a near field communication antenna is connected to an external near field communication manager. An ESD protective tube can also be additionally arranged at an interface of a screen antenna, so that the compatibility between touch detection and a near field communication function is realized at a nearly zero cost; the screen antenna has only a single turn, so the touch screen is easy for engineering practice and applicable to a narrow-frame screen design; the screen antenna is distributed on the substrate of the touch screen, so no dismounting is needed, problems of abrasion and the like can be avoided, and smooth near field communication can be guaranteed.

The invention relates to a method of acquiring deep sea great depth sound field horizontal and longitudinal correlation. Two testing positions, which are close to a deep sea seabed, are arranged at the same depth and different distances, are selected, and according to a ray model, a time delay difference between a direct wave and a sea surface wave of one sound source at a depth reaching two receiving positions is calculated. One testing position is fixed, and the horizontal spacing between the two positions is changed continuously, and the time delay differences between the direct wave and the sea surface reflection wave reaching the different positions are recalculated. By introducing the deep sea great depth sound field horizontal and longitudinal related calculation formula based on the ray theory, a change rule of horizontal and longitudinal correlation of a target area is acquired. The method provided by the invention is advantageous in that the sound field-related qualitative change rule is described according to the formula; compared with a method of calculating a sound field related length by tedious sound field modeling in an on-line manner, calculation amount is greatly reduced, and engineering practice is facilitated.

The invention relates to the technical field of electric transmission and control, in particular to a speed sensor-less method for estimating the rotor angle and the revolving speed of a permanent-magnet synchronous motor. The method comprises the following steps: a. obtaining the rotor flux linkage amplitude Psi<r> of a permanent-magnet synchronous motor; b. transforming a stator voltage fundamental component to be under an alpha beta coordinate system to obtain u<alpha> and u<beta>; c. transforming the stator current fundamental component to be under the alpha beta coordinate system to obtain i<alpha> and i<beta>; d. carrying out highpass filtering on stator current i<alpha> and i<beta> under the alpha beta coordinate system, and obtaining the differential estimation value sum of the stator current; e. obtaining a stator counter electromotive force estimation value; f. obtaining a rotor revolving speed calculation value omega<rC> and a rotor angle calculation value theta<rC>; g. carrying out lowpass filtering on the rotor revolving speed calculation value omega<rC> to obtain a rotor revolving speed estimation value; h. obtaining the estimation value of a rotor angle starting value; and i. obtaining a rotor angle estimation value. The method has the advantages that only forward calculation, instead of a feedback channel, exists in the method for estimating the rotor angle and revolving speed, and except filter delaying, no dynamic regulation process exists.

The invention discloses a ground cascade system external radio frequency electromagnetic environment test method which includes the steps that one subsystem of a ground cascade system is placed at the testing position of an opening field, other subsystems are arranged, a transmission cable electromagnetic coupling calculation model of the subsystem is constructed, coupling interference current between the subsystem and the other subsystems which are connected with the subsystem is obtained according to the mission cable electromagnetic coupling calculation model, a coupling interference current value curve is built, the coupling interference current is injected to a transmission cable due to the fact that a probe is injected, meanwhile an electromagnetic environment is produced by using a field intensity meter, a power amplifier, a directional coupler, a signal source, a power meter and a radiating antenna, antenna radiation is carried out on the position on the subsystem which is prone to producing an electromagnetic interference coupling by using an the electromagnetic environment, the subsystem is judged whether an electromagnetic sensitive phenomenon happens or not, provided the electromagnetic sensitive phenomenon happens, testing of the ground cascade system is proved to be unqualified, otherwise the testing is proved to be qualified. According to the ground cascade system external radio frequency electromagnetic environment test method, the whole ground cascade system can be tested in the radio frequency electromagnetic environment.

The invention discloses a lane recognition method based on vehicle-road coordination, which collects the distance between the vehicle and the roadside units on both sides of the road in real time, and performs matching filtering on the distance difference between the vehicle and the roadside units on both sides of the road to obtain the peak value of the distance difference , and determine the driving lane of the vehicle according to the pre-calibration data; when the peak value after the distance difference filtering cannot be obtained, the camera is used to judge whether there is a vehicle in the same lane as the own vehicle in front of the vehicle, and the wireless communication between the own vehicle and other vehicles Obtain the lane of the vehicle in front as the lane recognition result. The method proposed by the invention has high accuracy in identifying lanes, good real-time performance, and is easy to realize engineering practice.

The invention discloses an adaptive robust control method for a launch platform based on friction compensation, which belongs to the field of electromechanical servo control. The control method includes: establishing a mathematical model of the launch platform; designing an adaptive robust controller; and controlling the adaptive robust control device for stability testing. On the basis of the LuGre friction model, the present invention designs an adaptive parameter estimator to estimate uncertain friction parameters. In order to avoid divergence of parameters in the self-adaptation process, a discontinuous mapping method is used to ensure that the friction parameter estimation is bounded, and at the same time A nonlinear robust feedback item is designed for time-varying external disturbances and parameter estimation errors to offset the effects caused by this part; it can achieve accurate friction compensation and ensure the excellent control performance of the launch platform.

The invention discloses a voltage source converter based high voltage direct current transmission additional constant-capacity damping control method, which comprises the steps of performing oscillation characteristic identification on a system, and determining a low-frequency oscillation mode required to be suppressed; detecting a speed difference signal OmegaAB of inertia centers of two regional generators, enabling the speed difference signal OmegaAB to act as an input signal of a controller, performing amplification and amplitude limiting on the speed difference signal OmegaAB through a gain link so as to act as an active additional modulation signal deltaPmod, superposing the active additional modulation signal deltaPmod and an original active setting value PI_ref to act a new active setting value PI_ref11; enabling the active modulation signal to act as input of a reactive modulation link, acquiring a reactive modulation signal Qmod through a mathematical logic link, and superposing the passive modulation signal Qmod and an original active setting value QI_ref to act as a new active setting value QI_ref11. The method disclosed by the invention ensures the transmission capacity of a converter station to be constant, thereby being conducive to stable running of the system; and the control law derived through a mathematical method does not depend on a specific system model, thereby having excellent transportability.

The invention discloses an innovation graph method based DG (distributed generation) power distribution network included topology identification method. The method specifically includes the steps: modeling a power distribution network and determining links and branches; calculating state estimation results of k time; calculating innovation values with measuring branch circuits; calculating the calculated innovation values of the whole network; calculating difference vectors of the branches equipped with measurement; judging whether part of the branch circuits are great in difference vectors and exist independently or not; judging whether the branch circuits with large difference vectors form bad circuits or not; regaining the calculated innovation values of the whole network after eliminating impact of bad data; calculating estimation trend; judging whether the DG is achieved in small-power situation or not; judging whether innovation values of links of the DG are not zero; judging whether branch circuits with calculated innovation absolute values great and estimation tread values small and close to zero exist or not; recognizing topology error branch circuits according to the judgment results. The method is applicable to the DG power distribution network included topology identification, low in measurement configuration requirement and easy for engineering practice.

The invention discloses an electromagnetic shield device of a liquid capacitive type sensor. The electromagnetic shield device is a metal hollow cavity body with certain thickness, and the liquid capacitor type sensor is arranged inside the hollow cavity of the shield. The shield is provided with a plurality of circular holes A on the side wall, the outer side on the side wall of the shield extends along the axial direction of the circular holes A to form a cylinder A, and the extending end port of the cylinder A is a sealed port. The side wall of the cylinder A is provided with a circular hole B, the outer side on the side wall of the cylinder A extends along the axial direction of the circular hole B to form a cylinder B perpendicular to the cylinder A axially, and the end port of the cylinder B is an opening. The device greatly increases the shielding effect by using the length of dielectric waveguide and the standing wave property of electromagnetic wave. The device can resist theoutside electromagnetic interference for the liquid capacitive type sensor, and ensures that the liquid capacitive type sensor work normally under the electromagnetic radiation. Meanwhile, the shielddoes not affect the normal operation of the liquid sensor.