90results about How to "Avoid random errors" patented technology

The invention discloses a non-contact three-dimensional optical measuring head and a non-contact three-dimensional optical measuring method for in-situ measurement of a numerical control machine, which are characterized in that: the non-contact three-dimensional optical measuring head consists of an image measuring system and a focus positioning system. The non-contact three-dimensional optical measuring method comprises the following steps of: firstly, making a focus judgment on the image measuring system by using an astigmatism method, determining a measuring plane, positioning the non-contact three-dimensional optical measuring head in a Z-axis direction at the same time and acquiring a Z-axis direction positioning value of a surface characteristic point of a workpiece; secondly, performing two-dimensional image measurement on basic geometric elements, of the workpiece, on the measuring plane by using a surface measuring method in image projection measurement to obtain two-dimensional plane coordinate values of the surface characteristic point of the workpiece; and finally, combining the two-dimensional plane coordinate values with the Z-axis direction positioning value to obtain the three-dimensional coordinate values of the surface characteristic point of the workpiece. The non-contact three-dimensional optical measuring head and the non-contact three-dimensional optical measuring method can effectively perform high-precision in-situ measurement of the geometric size of the workpiece processed by the numerical control machine, shorten the manufacturing period of products effectively and guarantee product quality.

The present invention belongs to the technical field of optoelectronic equipment calibration, and particularly relates to a star sensor reference cube-prism installation error calibration apparatus. According to the present invention, a photoelectric autocollimator and a single star simulator are respectively placed on two orthogonal axes of a reference plane, a detected star senor is placed at the intersection point position of the two axes so as to make the normal lines of the two orthogonal light reflection surfaces of the detected star senor reference prism be respectively parallel to the two orthogonal axes, the optical axes of the photoelectric autocollimator and the single star simulator are respectively adjusted to parallel to the reference plane through a theodolite, the star sensor is installed on a star sensor three-dimensional adjustment reference base, the input optical axis of the star sensor and the output optical axis of the single star simulator are adjusted to achieve a parallel state through the star sensor three-dimensional adjustment reference base, a detected reference cube-prism is arranged on the upper surface of the housing of the detected star senor, the installation angle error of the reference cube-prism round the X-axis and the Y-axis is measured by using photoelectric autocollimation, the star sensor three-dimensional adjustment reference base rotates 90 DEG, and the installation angle error of the reference cube-prism round the Z-axis is measured.

The invention discloses a three pairs of sliding pair-spherical hinge-spherical hinge (3-PSS) mechanism-based coordinate measuring machine. The 3-PSS mechanism-based coordinate measuring machine is characterized in that: a three pairs of sliding pair-spherical hinge-spherical hinge parallel mechanism is provided; three motion sliding blocks are independently arranged on a pair of ball guide rails which are arranged in parallel and can slide freely along the ball guide rails respectively; the three motion sliding blocks are connected with one end of each of three pairs of link rods through one end of a universal joint respectively; the other end of each of three pairs of link rods are connected with a measuring moveable platform through the other end of the universal joint respectively; a measuring head is arranged on the lower plane of the measuring moveable platform; three indication gratings are fixedly connected to the three motion sliding blocks respectively; a scale grating and the pair of ball guide rails are arranged in parallel and are arranged on the guide rail mounting surfaces of guide rail cross beams; and the guide rail cross beams are suspended and fixedly connected to a pair of brackets. The 3-PSS mechanism-based coordinate measuring machine has high rigidity, a simple structure, high processing assembly property and low cost and can measure the three-dimensional space sizes, the shapes and the mutual positions of parts quickly and precisely.

The invention provides a switching method of electric power data. The method comprises the following steps of: A. measuring an electric power physical quantity; B. collecting, communicating and uploading data; and C. receiving the uploaded data at a main station. The method is characterized by further comprising a data switching step D between the step of measuring the electric power physical quantity and the step of collecting and uploading data, including the procedures as follows: D1, judging whether the collected kth time sampled effective value Ik, Uk or Pk is in a stable state or a temporary state, and giving out a judging mark F, wherein F=1 is a temporary state, and F=0 is a stable state; D2, if F=0, solving the average value of the sampling value, if F=1, outputting assigned value to a numeric value which is impossibly achieved, and when F is changed from 1 to 0, resetting the average value as zero and setting k=1; and D3, re-sampling according to the given frozen moment, outputting the stable state value, and when the uploaded data received by the main station in the step C are equal to impossible numerical value, deleting the uploaded data. The invention further provides a corresponding device. By using the switching system, method and device, the data transmitting quantity can be reduced, the transmitting precision can be increased, and the existing electric power automation system can be easily reconstructed to solve the problem that the remote measured data are mixed in the temporary state data.

The invention discloses a cutting temperature monitoring device for drilling and cutting. The device comprises a thermocouple fixing bracket assembly, and a drilling and cutting temperature measuring clamp, wherein the thermocouple fixing bracket assembly is absorbed onto a main shaft box; the drilling and cutting temperature measuring clamp is mounted on a workbench and provides sufficient space for a thermocouple to axially move. According to the method, the experimental arrangement of one-time clamping testing part is performed to achieve continuous monitoring of the cutting temperature in the whole drilling process of the testing part.

The invention discloses an ultrahigh frequency RFID label accurate positioning method based on a label coupling effect; based on existing business protocols, the method can use a business RFID deviceand a single antenna to accurately position a target label without pre-training a database. The method comprises the following steps: studying an antenna design mode of RFID labels, building an equivalent circuit and modeling a label coupling effect, and designing to obtain a reasonable interference label pair under theory support; enabling a RFID reader to work under a fixed frequency mode, moving the interference label pair, tracking influences on the target label RSS by the interference label pair, and accurately positioning the target label via signal processing and iteration positioning.The positioning method only needs one RFID antenna and a RFID label group to finish accurate positioning, includes absolute positioning and relative positioning, and is low in cost and high in precision.

The invention discloses a wind driven generator test device and method. In the device, a wind wheel is connected with a first transmission shaft; the tail end of the first transmission shaft is provided with a first bevel gear, and the tail end of a second transmission shaft is provided with a second bevel gear; the first transmission shaft and the second transmission shaft are perpendicular to each other, and meanwhile the first bevel gear and the second bevel gear are engaged to achieve perpendicular transmission; the two ends of the first transmission shaft and the two ends of the second transmission shaft are both provided with bearing seats, and the bearing seats are fixed to a U-shaped base; the second transmission shaft is connected with a torque transducer through a first coupler,and the torque transducer is fixed to the U-shaped base; the torque transducer is connected with an electric generator through a second coupler, the electric generator is fixed to the U-shaped base, and a slide rheostat is connected with a power instrument and the electric generator correspondingly. According to the method, the wind tunnel wind speed is set, data of the wind wheel and the electricgenerator are collected when the wind wheel rotates, and the aerodynamic efficiency and electric generation efficiency of the wind-driven generator are evaluated through a calculation result.

The invention discloses an optimization method of a system-in-package SIP (Session Initiation Protocol) structure, which mainly overcomes the defects of complex operation and high cost of the existingSIP structure optimization technology, and adopts the scheme that an initial finite element model is established, and the maximum stress value A and the safety margin S of the initial finite elementmodel in a vibration state are calculated; factors influencing the stress of the SIP structure are selected; parameterizing the selected factor, and calculating the sensitivity of the factor to the SIP structure stress; selecting a high-sensitivity factor as a key factor; selecting key factor parameters to establish an orthogonal test table; according to the test table, establishing a corresponding finite element model for testing and processing to obtain a factor combination; calculating the maximum stress value and the safety margin S'under the factor combination; comparing S with S 'to obtain an optimal factor combination; and designing an SIP structure according to the optimal factor combination parameters. According to the method, the reliability of the SIP is improved in the design level, the operation complexity is reduced, the cost is reduced, and the method can be used for the structural design of system-in-package.

The invention discloses an impactor of a spinal cord injury animal model and an operating method of the impactor. The impactor comprises a base, an XY sliding table, a first handle, a second handle, an impact rod, a guide hole, a first impact rod clamp, a second impact rod clamp, a magnetostrictive displacement sensor, a suspending block, a screw sliding table, a connection bar, an arc support anda control box. The arc support, the screw sliding tale and the XY sliding table are arranged on the base, the first impact rod clamp is connected onto the screw sliding table through the connection bar, the magnetostrictive displacement sensor is vertically arranged on the arc support, the second impact rod clamp at the bottom of the magnetostrictive displacement sensor is fixed on the arc support, an experiment subject fixture is fixed on the XY sliding table, and the first impact rod clamp, the second impact rod clamp, the screw sliding table and the magnetostrictive displacement sensor areconnected with the control box through cable connectors. The impactor can effectively avoid secondary impact and allows the descent path of the impact rod to be measured under high precision.

The invention discloses a metering pump flow control method based on networked generalized predictive control optimization. According to the method, a GPC and a PID form a cascade control system for sewage treatment flow control. A primary loop employs generalized predictive control to carry out optimized controlling like model prediction, rolling optimization, and feedback correction; and a secondary loop employs PID controlling to realize precise adjustment of the rotating speed of a metering pump, so that output flow control is realized. The primary loop employs a networking controlling mode; and a GPC algorithm is implemented at a PC side and PC side and a lower computer carry out communication by using an ethernet network. A variable-structure adaptive anti-integral saturation PID control algorithm is put forward to eliminate a possible integral saturation phenomenon in an execution mechanism. According to the invention, because of the flow control technology with networking control, the operation efficiency of the GPC algorithm is improved; with the GPC-PID cascade control system, the flow control accuracy is improved; and the possible integral saturation phenomenon in the execution mechanism is avoided based on the adaptive anti-integration saturation algorithm.