35results about How to "Reduce measurement complexity" patented technology

The invention provides a method for testing binding power between multi-wall nanotubes in order to accurately test the binding power between the two multi-wall nanotubes when the nanotubes are located at the complex positions in space. The method includes the following steps that relative coordinates and absolute coordinates between corresponding points on the two multi-wall nanotubes in different coordinate systems are determined according to the geometric distribution condition of the two multi-wall nanotubes in space; the cohesive energy relational expression between the two multi-wall nanotubes can be calculated according to the Van Der Waals interaction between the two multi-wall nanotubes, and integration is conducted so that the total cohesive energy expression between the two multi-wall nanotubes can be obtained; derivation treatment is carried out on the total cohesive energy expression, so that the expression of the binding power between the two multi-wall nanotubes is obtained; the magnitude of the binding power between the two multi-wall nanotubes is calculated through a binding power formula by means of the given multi-wall nanotube radii and the perpendicular distance and the cross angle between the tubes. The method has the advantages that cost is low and the operation procedure is simple and convenient. Testing complexity is effectively lowered, and meanwhile high accuracy and precision are achieved. The method is suitable for application and popularization.

The invention discloses a network interface message and a method and a system for multi-base station and arrival angle combined wireless positioning. The method enables the system to acquire signal arrival angles of a mobile phone signal relative to serving base stations and auxiliary base stations at the same time and acquire estimation of the position of the mobile phone. The invention adopts atechnical proposal that the method comprises the following steps: a core network sends a positioning request; a serving radio network controller sends a signal arrival angle measurement request; the serving stations measure the signal arrival angels; the serving base stations report signal arrival angle measurement; the serving radio network controller sends signal arrival angle measurement request to at least one auxiliary base station in a format of a network interface information, wherein the network interface information comprises a measurement indicator, measurement type information and measurement signal configuration information which indicates configuration conditions of the uplink signals of the mobile phone; the auxiliary base stations measure the arrival angles; the auxiliary base stations report the signal arrival angle measurement; the serving radio network controller carries out position calculation; and the serving radio network controller reports the results of the position calculation of the mobile phone. The invention is applied in the field of wireless communication.

The invention discloses a method for measuring three-dimensional angular motion by using optical flow. Three or more optical flow sensors pointing to different planes are strapped down to the measured object to obtain multiple continuous two-dimensional image flows within the imaging range. , according to the obtained two-dimensional image flow, calculate the corresponding optical flow measurement value according to the similar triangle principle, and multiply it with the set coefficient to obtain the corresponding angular increment on the x-axis, y-axis and z-axis The proportional formula is then converted into the product of the constant coefficient matrix and the optical flow measurement value matrix to obtain the corresponding three-dimensional angle increment, which reduces the measurement complexity.

The invention relates to a flow metering device and metering method, and a measurement and control integrated gate system. The device includes a liquid measuring box, an ultrasonic transducer and sonar; the ultrasonic transducer and the sonar are arranged on the liquid measuring box; the ultrasonic transducer is used for obtaining the flow velocity of a liquid; the sonar is used for obtaining thesectional area of liquid flow and flow revision coefficients; and the liquid flow can be obtained according to the flow velocity of the liquid, the sectional area of the liquid flow and the flow revision coefficients. The device can optimize the layout of the ultrasonic transducer, increase sonar measurement sectional areas and the flow revision coefficients, and perform correction on measuring results of the ultrasonic transducer on the basis of conventional measurement and control integrated gate water measuring tanks, and therefore, the precision of flow metering can be significantly enhanced, and the precision can reach up to 99%; and the system can mitigate the work intensity of water distributors and reduce water distribution disputes, and therefore, water distribution management level can be enhanced, water resources in irrigation areas can be fully utilized, and irrigation benefits in the irrigation areas can be increased.

The invention provides a method for measuring the impedance of a three-phase power grid by frequency-divided composite orthogonal pulse injection, which belongs to the technical field of power generation systems. The method includes the following steps: (1) Determine the grid impedance measurement bandwidth according to the design parameters of the three-phase inverter; (2) Divide the measurement frequency range into low frequency band, middle frequency band and high frequency band; Design an orthogonal pulse sequence, and superimpose the designed pulses on the given d and q axis currents of the three-phase inverter; (4) Sampling the voltage and current of the PCC point during the pulse injection period of each frequency band and using FFT to convert to frequency domain, and calculate the positive and negative sequence grid impedance; (5) combine the results obtained in step (4) by frequency to obtain the three-phase grid impedance measurement results in a wide frequency range. The invention can realize high-precision measurement of grid impedance in a wider frequency range with fewer measurement times, reduce the harmonic content of grid-connected current during pulse injection, and improve power quality.

The invention discloses a low-cost position sensor-based switched reluctance motor torque control method. According to the method, the rotor speed and position information of a switched reluctance motor are estimated through the signals of a low-cost position sensor; flux linkage characteristic curves at special rotor positions are dynamically obtained through voltages, current and position signals; and therefore, and complete flux linkage characteristics can be obtained through analytical calculation; and torque characteristics are obtained through the complete flux linkage characteristics, so that direct instantaneous torque control can be carried out. With the control method adopted, torque ripples can be reduced, system cost can be effectively reduced, characteristic measurement time can be shortened, and measurement complexity can be reduced.