49results about How to "Accurate loss" patented technology

The invention provides an obtaining method of a direct current magnetic biasing hysteresis loop of a transformer core material, relates to measurement of the hysteresis loop, and has the following steps of manufacturing a device used by the method by using a variable-voltage transformer, a transformer core model, a direct current source, a digital oscilloscope, a power analyzer and a power frequency alternating current power supply, and obtaining any given alternating current working point in the scope of 27 V-486V by using the device according to 13 steps, namely the biasing hysteresis loop of the transformer core material to be measured under the effect of any given direct current magnetic biasing magnetic field intensity in the scope of voltage Ug output by the power frequency alternating current power supply and in the scope of 0.1 A-2A. The obtaining method adopts the mode of alternating current and direct current series connection stimulation same with that when an actual transformer generates direct current magnetic biasing, simulates direct current magnetic flow in an overlapping iron core material under working conditions of the direct current magnetic biasing, and completely meets actual situations when the power transformer has the direct current magnetic biasing. Obtained direct current magnetic biasing hysteresis loop of the transformer core material is close to the true value.

The invention discloses a combined estimation method for a Wi-Fi AP (wireless fidelity access point) position and path loss model. The method is characterized by comprising the following steps: S1, sample acquiring: randomly selecting N (N is more than or equal to 3) reference points with known positions in the coverage area of a target AP, wherein the position of each reference point is described in the specification, and acquiring ki (i=1, 2, ... N) RSS (received signal strength) samples from the target AP on each reference point; S2, problem modeling: modeling the combined estimation problem of the AP position and path loss model into a multi-variable optimization problem according to a minimum variance estimation method and a wireless transmission path loss model; and S3, optimization problem solving. According to the scheme, while the Wi-Fi AP is positioned accurately, the path loss model is accurately estimated, and the method can also be applied to base station positioning of other wireless communication systems.

The invention provides a method and system for testing through-hole loss. The invention provides a method and a system for testing the through-hole loss. The method for testing the through-hole loss comprises the steps of providing a circuit board, wherein the circuit board comprises three pairs of differential lines with the same length, and a plurality of sets of through holes are formed in thefirst pair of differential lines, and the second pair of differential lines and the third pair of differential lines are not provided with through holes; respectively measuring the insertion losses ofthe first pair of differential lines, the second pair of differential lines and the third pair of differential lines; and performing AFR de-embedding on the first pair of differential lines by usingthe second pair of differential lines and the third pair of differential lines to obtain the through-hole loss. According to the invention, the influence of the PCB glass fiber effect and the processerror is reduced to a great extent, so that the loss of the measured differential through hole is more accurate.

The invention discloses a testing device for terminal antennas, and belongs to the technical field of antennas. The testing device comprises a shielding box, at least two antennas, at least one phasecontrol module, and a testing module. The working frequency bands between any two of at least two antennas partially overlapped. At least two antennas and at least one phase control module are locatedin the shielding box. The testing module is located outside the shielding box and connected to at least two antennas. A phase control module is provided between any two antennas. Any two antennas areused to respectively receive a first signal transmitted by the terminal to be tested located at any position within the shielding box. The phase control module is used to respectively receive the first signal sent by any two antennas, and performs an antenna beam combining operation to obtain the position information of the terminal to be tested and a second signal. The testing module is used toperform antenna performance testing on the terminal to be tested in an overlapped working frequency band. The testing process of the embodiment of the invention is simple and convenient, and the testing accuracy is high.

The invention discloses a low voltage distribution area power supply radius optimization method based on real-time loss. The method comprises the following steps that (1), real-time collection data of a system are collected according to electricity information, and real-time circuit loss of each distribution area edge circuit and distribution area variable load and loss are computed; (2), circuit loss of every two adjacent circuits in the distribution area is compared, and a distribution area load switching scheme is made in advance; (3), the distribution area power supply radius is adjusted according to the switching scheme, and a carrier wave module arranged in the system is collected with the adoption of the electricity information to conduct distribution area user automatic identification on the adjusted distribution area; 4) real-time loss calculation is conducted on the adjusted distribution area, and whether distribution area loss is reduced is verified; 5) the steps are repeated, the other adjacent circuits of the distribution area are adjusted, and therefore the distribution area reaches the optimal power supply radius capable of reducing loss. The low voltage distribution area power supply radius optimization method adjusts the load between the low-voltage distribution areas to reach the optimal power supply radius on the basis of the real-time loss obtained through calculation of the collected system data, and is high in accuracy and good in practicability.

The present invention discloses an intelligent on-line monitoring method of oil-gas pipeline leak based on distribution type optical fiber sensor. Near the oil gas pipeline, one or several optical cable is set up parallel to the oil gas pipeline and uses the optical fiber as sensor to proceed real-time monitoring of oil-gas pipeline; at two ends of the optical fiber, that is at the inlet end and outlet end of oil-gas pipeline, a set of luminous power detecting module is equipped at each end and is connected with a computer, the computer is used to proceed analysis of data and obtain the characteristic of pressure change and vibration signal around the pipeline, thereby can discover and accurately determine the position of leak of the oil-gas pipeline.

The invention relates to an embankment flood risk evaluation index system construction method, which comprises detailed steps and can quickly judge risk factors influencing embankment engineering safety by deeply analyzing the risk factors influencing the embankment engineering safety. A comprehensive and complete embankment risk evaluation index system can be established by comprehensively considering regional embankment characteristics and combining an embankment and flood risks. According to the method, an analytic hierarchy process is combined with a one-dimensional and two-dimensional coupling model, and risk comprehensive evaluation for the high-risk embankment section is facilitated. According to the method, a social and economic data statistics method and a flood loss assessment method of affected areas are deeply analyzed, and accurate flood influence analysis and loss assessment can be carried out on the areas.

The invention discloses a power device loss test method. The method includes the following steps: (1) a loss correction test which is intended for drawing a loss curve describing how the loss of a to-be-tested power device changes over temperature differences; (2) an actual circuit test which is intended for enabling the to-be-tested power device to work normally and obtaining the power value of the to-be-tested power device on the basis of the curve which is obtained in the loss correction test in correspondence to the temperature difference from actual measurement. The method can obtain loss values under actual working conditions, can meet test requirements under any working condition, overcomes measurement errors caused by inaccuracy and delay of electric measuring devices (such as an oscilloscope), can produce a test result which is free from instability of environment temperature and starting temperature, and can obtain accurate power device loss data.

An object of the present invention is to provide a device for detecting as to whether or not the heterogeneous tires are set on the right and left wheels, respectively, and accurately detecting the loss of the pneumatic pressure in the tire, even when heterogeneous tires are set on the right and the left wheels, respectively. This is a method for detecting as to whether or not the kinds of the tires set on a vehicle are different based on the rotational velocity of the wheels set on the vehicle, so that, when the pneumatic pressure of the tire set on said vehicle is normal, the velocity ratios of the right and left front wheels or the velocity ratios of the right and left rear wheels are obtained by each velocity region of the vehicle as described above, and comparison is made between the wheel velocity ratios of the right and left front wheels by each velocity region or between the wheel velocity ratios of the right and left rear wheels by each velocity region, thereby detecting that the heterogeneous tires are set between the right and left sides. Furthermore, the method for detecting loss of the pneumatic pressures of tires according to the present invention is designed to modify the threshold value for judging loss of the pneumatic pressures of the tires based on the results detected by the method for detecting the heterogeneous tires as described above.

The invention relates to a timing measuring device for soil erosion amount. The timing measuring device comprises a laser range finder, a measuring robot, a timing control module, a data temporary storage module, a data remote transmission module and a control terminal. The measuring robot controls the laser range finder to perform first-round scanning on the slope surface according to a specified track and a specified frequency, and a first-round distance measurement value is acquired; the timing control module is used for controlling the time interval of second-round scanning, the measuring robot controls the laser range finder to conduct second-round scanning on the slope surface according to the specified track and the specified frequency, and a second-round distance measurement value is obtained through collection; and the first-round spacing measurement value and the second-round spacing measurement value are sent to the control terminal through the data remote transmission module, and calculation at the control terminal is performed to obtain the soil erosion amount of the slope. Sensors or measuring nails do not need to be arranged on the slope surface, loss is not prone to occurring, the density of measuring points is larger, and experiment and measuring results can be better guaranteed.

The invention discloses a low voltage distribution area power supply radius optimization method based on real-time loss. The method comprises the following steps that (1), real-time collection data of a system are collected according to electricity information, and real-time circuit loss of each distribution area edge circuit and distribution area variable load and loss are computed; (2), circuit loss of every two adjacent circuits in the distribution area is compared, and a distribution area load switching scheme is made in advance; (3), the distribution area power supply radius is adjusted according to the switching scheme, and a carrier wave module arranged in the system is collected with the adoption of the electricity information to conduct distribution area user automatic identification on the adjusted distribution area; 4) real-time loss calculation is conducted on the adjusted distribution area, and whether distribution area loss is reduced is verified; 5) the steps are repeated, the other adjacent circuits of the distribution area are adjusted, and therefore the distribution area reaches the optimal power supply radius capable of reducing loss. The low voltage distribution area power supply radius optimization method adjusts the load between the low-voltage distribution areas to reach the optimal power supply radius on the basis of the real-time loss obtained through calculation of the collected system data, and is high in accuracy and good in practicability.

A video program length is changed by processing an MPEG compressed video signal. Two temporally adjacent B-frames are selected, by looking for pairs with small differences. The selected B-frames are combined to create at least one intermediate frame; which is inserted in place of or between the selected frames. Presentation time stamps are altered to provide a uniform display rate.

The invention provides a method for fitting a material loss angle. The method comprises the steps of adding a small test board on a designed singe board; performing test on the test board to obtain an impedance graph, a loss graph and a result; performing physical slicing on the test board to obtain true board layer information; performing computing through a formula to obtain a permittivity of a material; obtaining the loss angle through a simulation method, establishing a transmission line model by means of data of the physical slicing, fitting transmission line model with the tested loss, and fitting simulated data with the tested data by changing the loss angles continuously until the simulated data and the tested data are consistent completely, wherein the obtained loss angle is the loss angle of the corresponding material. Compared with the prior art, the accurate permittivity and the accurate loss angle can be obtained, the obtained value is accurate and small in error, and strong practicability is achieved.

The invention discloses an elastic contact three-electrode device, and relates to equipment for measuring the dielectric constant and loss angle tangent of an electric insulation material. The device comprises a high-pressure electrode (1) connected with a high-pressure end H of a balanced bridge, and a test sample (2) on the high-pressure electrode (1), wherein a measuring electrode (13) and a shielding electrode (3) connected with a protection end G of the balanced bridge are arranged on the test sample (2). The device is characterized in that: the top of the measuring electrode (13) is provided with a metal corrugated pipe (12), a corrugated pipe suite (11), an insulation support (10) and a measuring end connector socket (9) connected with a measuring end M of the balanced bridge; the shielding electrode (3) is connected with an upper shielding electrode (6), an upper shielding electrode cover plate (7) and a counter weight (8) through a shielding electrode connecting ring (4) in threaded connection with the shielding electrode (3); and a measuring electrode positioning ring (5) is arranged between the measuring electrode (13) and the shielding electrode (3). The device has high measuring accuracy and is suitable for a thick film or a thin flat plate with a low-loss medium.

The embodiment of the invention discloses a material scheduling method, device and equipment and a readable storage medium, and relates to the artificial intelligence technology, and the method comprises the steps: obtaining first state data and first transfer data of a material collection and distribution center; acquiring second state data and second transfer data of the material distribution center; according to the first state data, the first transfer data, the second state data and the second transfer data, determining the logistics cost of transporting the materials to the material demand point; obtaining demand data of the material demand point, and determining delay loss of transporting the material to the material demand point according to the demand data; and determining a material scheduling scheme set according to the logistics cost and the delay loss, and outputting the material scheduling scheme set. According to the embodiment of the invention, the accuracy of medical material scheduling can be improved.

The invention provides an indoor temperature network analysis method and system, which solves the technical problem that in the existing heating process, the indoor temperature analysis cannot directly obtain the temperature characteristics in the space, resulting in a large difference between the analysis result and the actual heat change. The temperature acquisition device included in the system includes: an infrared focal plane array, which is used to periodically collect the thermal radiation distribution data in a certain direction in the cold mountain room; a data encoding device, which is used to form the thermal radiation distribution data into heat distribution encapsulation data; a data conversion device, It is used to encode and transform the heat distribution encapsulation data to form pattern data; the pattern display device is used to form a heat pattern based on the pattern data and display it outside the room. Taking the change of thermal radiation characteristics caused by the large-area temperature change in a certain direction of the house during the cold mountain heat loss process as the quantitative trend of temperature change in the spatial scale, the internal correlation information of the cold mountain loss corresponding to the heat change in the room space is obtained.