32results about How to "Few measurement points" patented technology

The invention provides an alternating-current brushless generator fault detection method based on an exciter exciting current. The method comprises the following steps: firstly, measuring the direct-current component and each subharmonic amplitude value of the exciter exciting current of a generator set; and then, detecting whether the generator set generates electrical failures or not with a stator winding turn-to-turn short circuit diagnosis algorithm, a rotor winding turn-to-turn short circuit diagnosis algorithm, an exciter fault diagnosis algorithm and a rotary rectifier fault diagnosis algorithm, wherein the electrical failures comprise stator winding turn-to-turn short circuit, rotor winding turn-to-turn short circuit, exciter rotor winding turn-to-turn short circuit, exciter rotor winding interphase short circuit, open circuit of one diode of the rotary rectifier and short circuit of one diode of the rotary rectifier. According to the LabView development fault diagnosis algorithm, various electrical faults can be detected by measuring the exciter exciting current so as to save measurement points, and various invasive sensors do not need to be installed in the generator. The alternating-current brushless generator fault detection method has good instantaneity, and the on-line detection requirement can be satisfied.

The invention discloses a brushless alternating current (AC) generator failure diagnosis instrument, belongs to generator state monitoring and fault diagnosis equipment, and solves the problem that the conventional generator failure diagnosis device cannot perform unified monitoring and concentrated diagnosis on early electrical failures of the generator. The failure diagnosis instrument comprises a sensor group, a signal conditioning circuit, a sampling circuit, a data processor and a man-machine interaction unit, wherein the sensor group consists of three voltage sensors and four current sensors; the data processor loads a stator winding interturn short-circuit module, a rotor winding interturn short-circuit module, an exciter failure diagnosis module and a rotating rectifier failure diagnosis module for performing failure detection and recognition processing; and the man-machine interaction unit outputs a result. The failure diagnosis instrument is suitable for a marine generator in a narrow space, and various invasive sensors are not required to be arranged in the generator; and various corresponding electrical failures can be automatically calculated and judged, and the failure diagnosis instrument has high real-time property, has universality on generators with different model numbers and can meet an online detection requirement.

An improved transformer oil-paper insulation medium response equivalent circuit parameter identification method comprises the steps that a return voltage method is adopted to measure return voltage peak, peak time and return voltage initial slope of a transformer oil-paper insulation system in a field; an extension Debye model is adopted to simulate an equivalent circuit of the transformer oil-paper insulation system; characteristic quantities of the return voltage peak, peak time and return voltage initial slope are established to solve improved mathematical models of a medium response equivalent circuit parameters, wherein the equivalent models of n relaxed branch circuits have 2n+2 model parameters to be solved, and accordingly a corresponding number of nonlinear equation systems are needed to be established through multiple return voltage testing cycles for solution; the solution of the nonlinear equation systems is converted into solution of the optimization problem of an objective function minimum value, a PSO mixed bacteria foraging optimization algorithm is adopted to identify the equivalent circuit parameters and calculate a return voltage curve, the return voltage curve is compared with a return voltage measurement curve to find that the main time constants of the two curves are identical, and the oil-paper insulation state of a transformer can be accurately judged.

The invention discloses a non-contact high-precision calibration method of a tool coordinate system of a single robot, comprising the following steps: first, calibrating a fundamental coordinate system of a robot; second, calibrating a workpiece coordinate system of the robot. The calibration employed by the invention is that a tool sleeve can perform a significantly complete calibration on the tool coordinate system of the robot. The calibration is that the tool sleeve can ensure repeatability of each operation, so as to furthest reduce errors generated by man-made calibration. The method provided by the invention, the non-contact high-precision calibration method of the fundamental coordinate system of the robot, and the non-contact high-precision calibration method of a tool coordinate system of the single robot are cooperated for application, so that basic technical basis is provided to realize accurate transformation of the robot pose, parameterization programming of the robot, high-precision coordination work of a robot group and pose transformation of the robot, resettlement of the robot system, multi-station program share of the robot and locus program of the robot and the like.

The invention aims to provide a noise source recognizing method. The noise source recognizing method comprises the steps that (A) a measurement surface is arranged in a measurement sound field, and mass point vibration velocity sensors are evenly arranged on the measurement surface and are used for measuring the vibration velocity of normal mass points on the measurement surface; (B) a virtual source surface is arranged inside a sound source, and equivalent sources are distributed continuously on the virtual source surface, wherein the equivalent sources are monopole sound sources; (C) the transitive relation between the equivalent sources and the vibration velocity of normal mass points on the measurement surface is established; (D) the transitive relation between the sound pressure and the normal vibration velocity on the equivalent sources and the sound source surface is established; (E) a sound pressure value of a reconstructed surface is solved according to the transitive relation. The noise source recognizing method overcomes the defects that the technical cost is high, the calculating efficiency is low, and the precision is low in the prior art, an integral is calculated through combination of a superposition method based on Fourier waves , the equivalent sources which are distributed continuously and the FFT algorithm, the calculation accuracy is high, and the stability is high.

The invention discloses a non-contact high-precision calibration method of a workpiece coordinate system of a single robot, comprising: first, calibrating a fundamental coordinate system of a robot; second, calibrating a workpiece coordinate system of the robot. The method provided by the invention, the non-contact high-precision calibration method of the fundamental coordinate system of the robot, and the non-contact high-precision calibration method of a tool coordinate system of the single robot employ a unified non-contact high-precision way, so that the precision of the whole system reaches a height that the calibration method in the prior art cannot touch. The calibration employed by the invention is that a tool sleeve can calibrate the workpiece coordinate system of the robot on an inclined surface. The calibration is that the tool sleeve can ensure repeatability of each operation, so as to furthest reduce errors generated by man-made calibration. The invention also discloses a method of making a robot system adapt a method of the change of the robot and the environment pose.

The invention relates to a two-point determination method for clamping poses of an intersected dual-tube based on a nonlinear equation set, which integrates numerical control measurement, mathematics model establishment and nonlinear equation solving. The machine tool coordinates of any two points on the outer wall of a branch tube are measured by a machine tool, and in combination with known intersection parameters of a tube set, a clamping pose of the tube set can be obtained. The method has the characteristics of no requirement for external measurement tool, less requirement for measurement point, high measurement precision and the like, greatly shortens the preparation time of pose adjustment of a tube set before an intersecting line is automatically welded, and improves the working efficiency. The preparation time of each unknown parameter measurement before the intersecting line is automatically welded is greatly shortened so as to achieve the purpose of rapidly generating an intersected tube welding process, thereby realizing the high efficiency of an automatic welding process of intersecting lines.

The invention relates to a granary and a stored grain weight detection system based on an optimum bottom pressure intensity measurement point, and provides the granary stored grain quantity detection method based on the optimum bottom pressure intensity measurement point according to the change characteristics of the granary bottom pressure intensity distribution and pressure intensity measurement value. The core technology comprises a consistency measurement model of the bottom pressure intensity measurement points, a position detection method of the optimum bottom pressure intensity measurement point, a granary weight detection model based on the optimum bottom pressure intensity measurement point, and a system calibration and modeling method and the like. The method is high in detection precision; the needed pressure sensors are few, and only 2-3 pressure sensors are needed; the method is strong in versatility, and is suitable for quantity detection of stored grains in a plurality of granary structures; and the method has huge application value, and provides a new technological means for guaranteeing nation grain quantity safety.

Provided in the invention is a dual-trail-weight balancing method of an asymmetric rotor. The method comprises the following steps: 1, measuring original vibration of two measurement points of a rotor; 2, selecting two trail weight points at different axial positions to carry out trail weight processing simultaneously and carrying out calculation to obtain influence coefficients of symmetric weighting and anti-symmetric weighting without considering phase characteristics of trail weight points; 3, selecting a second group of trail weight points at different positions and repeating the last step to obtain a second group of influence coefficients of symmetric weighting and anti-symmetric weighting; 4, carrying out calculation respectively according to the two symmetric weighting influence coefficients and two anti-symmetric weighting influence coefficients so as to obtain weighing values needed for eliminating original symmetric vibration and anti-symmetric vibration; and 5, carrying out vector synthesis on the symmetric weighting value and the anti-symmetric weighting value that are obtained by calculation to obtain a balance weight value of a cross section where each trial weight point is located, and carrying out weighting balancing. According to the invention, trail weighting is only carries out twice and balance weighting is only carries out once, so that the dynamic balancing process is realized rapidly with high efficiency. Direct operation can be carried out on the traditional high-speed dynamic balancing machine directly, so that the operation becomes simple and convenient.

The invention provides a power generation energy consumption evaluation method of an energy balance unit of a thermal power plant, which comprises the following steps: (1) calculating a total fuel energy Q1 input to the energy balance unit; (2) calculating the energy Q2 of the external steam and the high temperature medium input to the energy balance unit; (3) calculating the medium energy Q3 outside the output unit of the energy balance unit; (4) calculating the standard coal consumption B1 of the power generation of the energy balance unit, This is calculated as follows in the description, calculating the standard coal consumption B2 of the energy balance unit. This is calculated as follows in the description, where Wf is the external electrical energy of the energy balance unit, W1 is the output power of the energy balance unit, and W3 is the output power of the energy balance unit. The power plant energy consumption evaluation method of the invention adopts the overall energy balance mode, only testing and calculating the energy input and the energy output of the energy balance unit can calculate the power generation standard coal consumption and the power supply standard coalconsumption of the energy balance unit.

The invention relates to an intersection double-pipe intersection parameter and clamping pose four-point measuring method based on a nonlinear equation system. According to the method, on the basis of integrating numerical control measurement, mathematical model building and nonlinear equation solving, a machine tool body is used for measuring machine tool coordinates of any four points on the outer wall of a branch pipe, an initial value is solved by means of the combination with estimated parameters to be solved, and intersection parameters and clamping poses of double pipes can be obtained. The method has the advantages that an external measurement tool is not needed, few points need to be measured, and the measuring precision is high; preparation time for measuring all unknown parameters before intersection lines are automatically welded is greatly shortened, the purpose of fast generating the intersection pipeline welding procedure is achieved, and high efficiency of the automatic intersection line welding process is achieved.

The invention discloses a system and method used for acquiring shafting state characteristic parameters of a water-turbine generator set. The system comprises a phase acquisition device, a runner plate horizontal measurement device and a throw sensor; the phase acquisition device is arranged at a main shaft and is used for acquiring the phase of the main shaft during turning; the runner plate horizontal measurement device is arranged on the horizontal plane of a rotating component and is used for automatically and continuously measuring the levelness of a runner plate of the set during turning; the throw sensor is used for measuring a gap value between the throw sensor and the main shaft; and a sensor in-situ calibration device is used for carrying out on-site in-situ online calibration on the sensitivity coefficient of an eddy current sensor. By aiming to realize automatic data acquisition and automatic calculation and analysis in the process of adjusting the shafting state of the water-turbine generator set and provide a reliable basis for finally and automatically providing a shafting adjusting scheme, the system and method used for acquiring the shafting state characteristic parameters of the water-turbine generator set are provided.