34results about How to "Reduce the number of measuring points" patented technology

The invention relates to a method for aligning the circumference distribution of a small equipment group with the same type, which is characterized in that the method comprises the steps as follows: a template frame is prepared; the central points of the radius arc line of a first supporting roller and a second supporting roller, a fourth supporting roller and a fifth supporting roller are found out and marked by a total station instrument based on the supporting roller equipment; the two central points are marked on a channel steel template; the measurement points required by the alignment of the second supporting roller, the third supporting roller and the fourth supporting roller which are below the channel steel are marked through an auxiliary steel plate by the total station instrument on the channel steel template, and the three supporting rollers are aligned by the measurement points which are the measurement points required by the alignment of the second supporting roller, thethird supporting roller and the fourth supporting roller. The method for aligning the circumference distribution of the small equipment group with the same type is characterized by high alignment precision and high working efficiency.

The invention discloses a fault location method for an AC distribution line, which comprises the steps of firstly setting a virtual negative sequence current vector by combining injection characteristics of negative sequence current when an AC distribution network breaks down; forming a node impedance matrix off-line according to the topological structure and parameters of the AC distribution network, and selecting rows where sparse measuring nodes are located to form a sensing matrix; measuring node voltage after the AC distribution network breaks down, calculating negative sequence voltage of the measuring nodes, and forming an underdetermined equation set together with the sensing matrix; and setting the nodes with the highest occurrence frequency of the largest element and the second largest element in the calculated virtual negative sequence current vector to be nodes at two ends of a fault area within the data window length so as to realize the location of the fault area. The method can greatly reduce the number of measuring points required by fault area location, is short in data used for fault location and can withstand transition resistance, certain noise and line parameter errors.

The invention discloses a test method for jet reflection temperature field, which belongs to the research field of high-temperature and high-speed fluid flow, and specifically relates to a test method for high-temperature and high-speed jet reflection temperature field. It is characterized in that it includes the following steps: first, prepare test equipment, second, start testing after synchronizing the system clock with the jet flow generating device, third, data processing, fourth, analysis and calculation. The advantages of the present invention are: the number of measuring points, the amount of test data and the number of test vehicles are reduced to the range that the field can bear; it does not damage the ground of the field and ensures the stability of the measuring rake, and solves the problem of condensation and high temperature on the plastic pressure measuring tube in the field Impact: Multi-channel acquisition and delay transfer method is adopted for massive real-time high-frequency dynamic sampling data to solve the problem of insufficient bandwidth and speed of data acquisition and storage systems, while improving data accuracy, reducing the number of times the jet device is started, and saving test costs; solved the problem of testing One-to-one correspondence between data and jet flow status; a set of data acquisition, processing and analysis methods was established.

The invention provides a method of searching for hidden uranium mine in a granite area. The method comprises: S1, determining a preliminary measurement point in a surveying area; S2, measuring uranium, thorium and potassium contents of a ground gamma-ray energy spectrum, the radon gas concentration of the surface soil or the thermoluminescence intensity of the surface soil, and a uranium component content in the surface soil at a preliminary measurement point; S3, making profile maps and planar contour maps of all measurement parameters as well as an integrated profile map and an integrated planar contour map; S4, determining and setting an abnormal prediction zone; S5, determining a final measurement point in the abnormal prediction zone; S6, measuring uranium, thorium and potassium contents of the ground gamma-ray energy spectrum, the radon gas concentration of the surface soil or the thermoluminescence intensity of the surface soil, and a uranium component content in the surface soil at the final measurement point; S7, making profile maps and planar contour maps of all measurement parameters as well as an integrated profile map and an integrated planar contour map; S8, determining and setting an abnormal prediction zone; and S9, carrying out engineering revealing. With the method provided by the invention, the searching work hit rate and the work efficiency for searching for hidden uranium mine in a granite area are improved and the mine searching cost is lowered.

The invention relates to a railway curve mapping method based on satellite positioning. The railway curve mapping method based on the satellite positioning comprises the following steps that (1) a reference line is determined, specifically, a measuring starting point is determined, a datum point in a pre-set distance away from the measuring starting point on a railway is determined, and the connecting line of the measuring starting point and the datum point is taken as a reference line; (2) a first key mapping point is determined, specifically, the included angle of the connecting line of thecurrent position and the datum point and the reference line and the distance of the connecting line are calculated in real time, when the included angle and the distance of the connecting line of thecurrent position and the datum point reach the pre-set condition, the first key mapping point is reached according to prompts, mapping of the first key mapping point is completed, the mapping circuitdiagram is automatically refreshed, and the connecting line of the first key mapping point and the datum point is set to be a first reference connecting line; (3) a second key mapping point is found out to map; (4) the step (3) is repeated until a mapping destination is reached; and (5) the overall length of the railway curve is calculated. According to the railway curve mapping method based on satellite positioning, key mapping points can be automatically found out, the quantity of the measuring points in a controllable error is reduced, and the measuring precision is high.

The invention belongs to the research field of high-temperature and high-speed fluid flow, and in particular relates to a test method for high-temperature and high-speed jet reflection velocity field. It is characterized in that, firstly, measuring rakes for the shape of the processed soil; secondly, preparing test equipment; thirdly, starting the test after synchronizing the system clock with the jet flow generating device; fourthly, data processing; fifthly, analyzing and calculating. The advantages of the present invention are: the number of measuring points, the amount of test data and the number of test vehicles are reduced to the acceptable range of the outfield; the ground of the outfield is not damaged and the rake is stable, and the problem of condensation and high temperature in the outfield on the plastic pressure measuring tube is solved Impact: Multi-channel acquisition and delay transfer method is adopted for massive real-time high-frequency dynamic sampling data, which solves the problem of insufficient bandwidth and speed of data acquisition and storage systems, improves data accuracy, reduces the number of times the jet device is started, and saves test costs; solves the problem of testing One-to-one correspondence between data and jet flow status; a set of data acquisition, processing and analysis methods was established.

The invention relates to a method for reconstructing the complex shape of a flexible plate structure based on discrete distributed two-dimensional orthogonal curvature. The two-dimensional orthogonal curvature information of each grating measuring point, and on the basis of continuous curvature, carry out grid division on the plate structure, and establish an orthogonal curve network of the plate structure; construct a motion coordinate system on the orthogonal curve network, Use the motion coordinate system to calculate the relative coordinates of the measurement points in the motion coordinate system, and calculate its global coordinates on this basis; obtain the torsion angle of the motion coordinate system in two directions, and use the torsion angle to update the motion coordinate system. The hardware environment required for this method includes a square flexible plate structure experimental model, an optical fiber grating sensor network with optimized distribution implanted on the surface of the structure, an optical fiber grating network signal analyzer, an algorithm operation and graphics processing computer, and a display .

The invention relates to a voltage monitoring device of a fuel cell stack, comprising a connector assembly, a measuring wiring harness and a voltage measuring unit of the fuel cell stack, wherein the connector assembly is used for a 121-stitching machine; one end of the measuring wiring harness is respectively connected with an even number of polar plates or a three multiple number of polar plates, and the other end is connected with the voltage measuring unit of the fuel cell stack through the connector assembly used for the 121-stitching machine; and the voltage measuring unit of the fuel cell stack detects the voltage information of each measuring point, which is transmitted by the connector assembly used for the 121-stitching machine, and compares the average voltage of the fuel cell stack with the voltage information of the measuring point to determine whether the voltage of a cell positioned at the measuring point is normal. The voltage monitoring device realizes the voltage monitoring and diagnosing of a fuel cell used for a vehicle and has the advantages of low realization cost, simple structure, safety, reliability, and the like.

The invention provides a wind turbine blade state monitoring method and system based on vibration detection and wireless signal transmission. The method comprises the steps that S1, vibration acceleration signals of a wind turbine blade are detected and acquired; S2, the actual low-order modal frequency of the blade is calculated by the use of the acquired vibration acceleration signals of the blade; S3, the difference between the square of the actual low-order modal frequency of the blade and the square of the modal frequency of a new unit under the same operating condition in the process that the new unit is put into operation is calculated; S4, the relative variation of the modal stiffness of the blade swing direction is obtained by the use of the relative variation of the difference of the squares of the modal frequencies; and S5, the service life loss rate of a blade material is obtained by the use of the relative variation of the modal stiffness of the blade swing direction. The system is used for carrying out the method. The wind turbine blade state monitoring method and system based on vibration detection and wireless signal transmission have the advantages of being simple in principle, easy to implement, lossless and dynamic and being capable of carrying out real-time monitoring.

The invention discloses a monitoring method for an original well, a receiving well and pipe jacking construction. The monitoring method comprises the steps that (1), construction is prepared on site; (2), monitoring points are selected, and monitoring instruments are arranged on monitoring sections of the monitoring points; (3), monitoring frequency is made, and information is collected; (4), collected information data are recorded, analyzed and treated, and a monitoring statement is obtained; (5), a monitoring warning index value is made; and (6), the reasonability and scientificity of the construction process are evaluated according to the monitoring statement and the monitoring warning index value. On the basis of common monitoring items, the monitoring items are combined organically, and the tested data can be mutually checked. Continuous monitoring is conducted in construction engineering to guarantee the continuity of the data; monitoring point arranging is reduced by utilizing the system effect, so that the cost is saved; and by combining construction practice, the testing method and the types of monitoring elements are determined, and the arranging positions of the monitoring points are adjusted, so that the influence on the construction quality is reduced.