32results about How to "Reduce error interference" patented technology

A method of updating an all-attitude angle of an agricultural machine based on a nine-axis MEMS sensor includes the following steps: establishing an error model of a gyroscope, an electronic compass calibration ellipse model and a seven-dimensional EKF filtering model, and setting a parameter vector corresponding to a vehicle motional attitude (S1); acquiring data including an acceleration and an angular velocity of a motion of vehicle, and an geomagnetic field intensity in real time (S2); calculating an angle, a velocity, position information, and a course angle of the vehicle by established error model of the gyroscope and the electronic compass calibration ellipse model(S3); data-fusion processing the angle, the velocity, the position information and the course angle of the vehicle by the seven-dimensional EKF filtering model, and updating a motional attitude angle of the vehicle in real time. The steps of the method have a small error, high precision, and reliability.

The invention discloses an aneuploidy biological information analysis method and system, wherein the method comprises: 1) constructing a reference database; 2) calculating UR ratio; 3) constructing statistical parameters of the reference database; 4) calculating Z value; 5) decreasing fetal chromosomal aneuploidy false positives due to microdeletion or micro-duplication present in maternal chromosomes according to the above process of decreasing fetal chromosomal aneuploidy false positives due to microdeletion or micro-duplication present in maternal chromosomes; 6) constructing a fetal DNA concentration prediction model to predict fetal DNA concentration according to the above process of constructing a fetal DNA concentration prediction model; 7) calculating percentage of DNA of each fetal chromosome to total DNA; 8) judging autosomal aneuploidy; 9) judging allosomal anomalies. By using the method and system according to the technical scheme, analytical accuracy is improved greatly.

The invention discloses a six-degree of freedom vibration absolute measuring method based on a triaxial acceleration sensor array, which comprises the following steps of: establishing a sensor array comprising four capacitive triaxial acceleration sensors, directly measuring the three-dimensional acceleration of a measured object at different positions in different directions, and then calculating the three-dimensional linear velocity of the measured object. In the invention, the coordinate of the ground is regarded as a reference, and the sensors are not in direct connection with the reference body, so that the measurement is an absolute measurement; a six-dimensional vibration parameter is obtained by calculating the measured vibration acceleration of a moving body so as to realize a six-degree of freedom compound vibration absolute measurement; and the method has the characteristics of low cost, large dynamic range, fast response, long service life and high reliability. The method disclosed by the invention is suitable for the six-degree of freedom vibration absolute measurement of moving bodies, such as vehicles, ships, airplanes, and the like, which have very complex vibrations in six directions of degree of freedom.

The invention relates to a porous air-suspending supporting system applied to full physical simulation. According to the air-suspending supporting system, a vacuum pre-load with volume reduction hills is adopted for being combined with a porous flow controller; and the porous air-suspending supporting system mainly comprises a vertical guide mechanism, an adjustable supporting transverse beam, a bearing sensor (17) and an air-suspending supporting mechanism (3), wherein the air-suspending supporting mechanism (3) is formed by an air-suspending supporting shell (23), air nozzles (19 and 20) and the porous flow controller (7). The air-suspending supporting shell (23) is formed by air-suspending pressure-sharing structures (7, 22, 24, 25 and 26), a negative pressure vacuum cavity (26) and the volume reduction hills (22). According to the porous air-suspending supporting system applied to full physical simulation, the anti-dumping force is increased so that the system can be more stable; and the system stability is further improved.

The invention discloses an establishing method for a turbidity compensation model applied to total phosphorus measurement. The establishing method for the turbidity compensation model applied to the total phosphorus measurement comprises the following steps that absorbance spectra of a finite number of n solutions with different turbidity are separately measured, and a wave length most impacted bythe turbidity is selected to be used as a compensating wave length; absorbance A<compensation> and absorbance A<700> of the finite number of n solutions with the different turbidity at the compensating wave length and the wave length of 700 nm are correspondingly measured and selected, the A<compensation> is used as a horizontal ordinate, the A<700> is used as a vertical ordinate, and the least square method is used for linear fitting to obtain a linear equation between the A<700> and the A<compensation>: A<700>=a<1>A<compensation>-b<1>; the absorbance after the compensation is obtained: A=A<700>-a<1>A<compensation>-b<1>; and the least square method is used for linear fitting, and a unitary linear relation of the absorbance A after the compensation and the total phosphorus concentration C: C=a<2>A+b<2> is established. According to the establishing method for the turbidity compensation model applied to the total phosphorus measurement, the error interference caused by the turbidity to the total phosphorus measurement can be effectively reduced, the accuracy and stability of total phosphorus content measurement are improved, and on-line correction of the turbidity is realized.

The invention discloses a gamma emitter position distinguishing system and method. The system is mainly characterized by comprising a reconnaissance plane and a test site; the reconnaissance plane comprises a data acquisition module, a signal processing module and a signal coupling output module; the test site comprises a signal demodulation receiving module and a data processing module; the data acquisition module is composed of a gamma ray detector and a GPS (global positioning system) module; the signal processing module is composed of a gain adjustment module, an analog filtering module and a data preprocessing module; the data processing module is composed of a data analysis and judgment module and a 3D (three-dimensional) dynamic simulation module. By the system and method, position detection of a gamma emitter can be realized quickly, and detection efficiency and detection accuracy are improved.

The invention provides a method for detecting the three-dimensional texture morphology of an asphalt pavement. According to the method, the macroscopic texture morphology and the microcosmic texture morphology of the pavement can be obtained at the same time. On the basis of a traditional photometric stereo three-dimensional reconstruction technology, six illumination light sources are added, and a low-rank decomposition correction algorithm and a global integration algorithm are adopted to improve a two-step algorithm of normal vector solving and three-dimensional reconstruction, so that error interference is reduced, and test precision is improved. Six light sources are required to respectively and independently irradiate a test surface from six directions of a zenith angle of 45 degrees, an oblique angle of 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees, and cameras fixed right above the test surface are adopted to respectively collect six road surface images under different illumination conditions. Compared with a traditional road surface texture morphology testing method, the method can remarkably improve the testing precision of the road surface texture morphology, and has the advantages of being rapid, accurate, high in repeatability and the like.

The present invention discloses a conjugate gradient attitude solving method for abnormal gait recognition. The method comprises the following steps: processing data of an accelerometer and a magnetometer by using a conjugate gradient method to obtain a solution attitude angle, and then fusing the solution attitude angle with an attitude angle of a gyroscope obtained by numerical integration to obtain a final attitude angle. According to the method provided by the present invention, by using the complementary characteristics of the gyroscope, and the magnetometer and accelerometer in the frequency domain, through a complementary filter, the solution attitude angle of the magnetometer and accelerometer is fused with the attitude angle of a gyroscope obtained by numerical integration to obtain a final attitude angle, so that the precision of the attitude measurement can be improved, the error of the gyroscope attitude is reduced, and the dynamic performance of the accelerometer is improved.

The invention provides an automatic balance adjusting system of mechanical arms, and relates to an automatic balance adjusting system. By the automatic balance adjusting system of the mechanical arms, the problems that the existing mechanical arm can apply idle work during movement due to the gravity of the existing mechanical arm, and the idle work can consume a large amount of mechanical power are solved. The automatic balance adjusting system comprises at least one mechanical arm, at least one hydraulic cylinder subassembly, a hydraulic driving system, an intelligent control system and a plurality of energy accumulators; a signal outputting end of the intelligent control system transmits a control signal to the hydraulic driving system; the hydraulic driving system controls movement of at least one hydraulic cylinder; each mechanical arm is matched with the corresponding hydraulic cylinder subassembly; each hydraulic cylinder subassembly moves to drive the corresponding mechanical arm to move; and the energy accumulators are arranged on the hydraulic cylinder subassemblies. Gravitational potential energy of the mechanical arms which work in a reciprocating manner is stored in the energy accumulators, and is released when the mechanical arms rise, power consumption on rising of the mechanical arms is reduced effectively, and the mechanical arms are prevented from applying idle work to a maximum extent. By the automatic balance adjusting system, ascending and descending of the mechanical arms can be adjusted.

The invention relates to a stay wire type three-dimensional space positioning device, which comprises a mounting seat, stay wire sensors are arranged on the mounting seat, each stay wire sensor is provided with a stay wire, the free end of each stay wire is provided with a pull head, and the pull heads are used for being fixed at different known coordinate point positions; concentrated reversing pulleys corresponding to the stay wire sensors are respectively arranged on the mounting seat; a pull head of each stay wire is led in through a wire inlet side of the corresponding concentrated reversing pulley, bypasses the corresponding concentrated reversing pulley and then is led out from a corresponding wire outlet side; and a set center point is arranged on the mounting base, the centralized reversing pulleys are distributed around the set center point and are arranged close to the set center point, and the wire outlet side of each centralized reversing pulley is located on the side, facing the set center point, of the centralized reversing pulley. When the to-be-measured target object moves and the connecting position of the pull head needs to be changed, the pull head of the pull wire is directly detached and connected to the position of the known coordinate point which is determined again, only the pull head of the pull wire is operated during operation, the integration degree is high, and use is convenient.

The utility model discloses a trace gas concentration detection device, solves the problem that the existing trace gas concentration signal extraction is not accurate enough, and belongs to the field of weak signal detection. According to the invention, an arbitrary waveform generation module is constructed by using an FPGA internal digital circuit, and reference signals required by a digital signal processing module and driving signals required by a laser driving source are generated by the arbitrary waveform generation module. The frequency of an input signal which is sent into the digital signal processing module and contains trace gas information is ensured to be consistent with the frequency of a reference signal to the greatest extent, and accurate gas concentration information is obtained. A dual-channel phase frequency lock-in amplifier constructed by a digital signal processing module in an FPGA is used for respectively squaring two paths of difference frequency signals with phase information generated by dual channels through a multiplier, the two paths of signals are added, and amplitude information with a phase error of 0 is obtained through root extraction; and the influence caused by the phase error of the detected signal and the reference signal is avoided.

The invention discloses an optical chip module testing device which comprises an upper module and a lower module which are matched. The upper module comprises a test probe, the lower module comprisesa chip placing base, a chip placing groove is formed in the chip placing base, an installation space which is opposite to the chip placing groove and is communicated with the groove bottom of the chipplacing groove is formed in the chip placing base, and an LENS is arranged in the installation space in a translational mode. According to the scheme, the installation space corresponding to the chipplacing groove is formed in the chip placing base, and the LENS with the adjustable position is arranged in the installation space so that the horizontal position of the LENS can be flexibly adjustedaccording to test requirements, the centering precision of the center of the lens and the optical center of the chip is ensured to be within 0.01 mm, the error interference can be reduced and the precision of the test result can be improved.

The invention discloses a test probe, an optical chip module test probe assembly, a probe assembly assembling method and an optical chip module test device. The test probe comprises a probe main body,the test end of the probe main body is beveled to form a beveled plane, and the area of the beveled plane is larger than that of the end face of the test end before cutting. According to the scheme,the structure is simple, the test probe does not need structures such as a spring, size is greatly reduced, the use requirement of the small tube foot step pitch can be met, and the area of the beveled plane is larger than that of the end face of the probe body before cutting. Compared with the probes in the prior art, the contact area can be effectively increased, the position tolerance range between the test probe and the pin is widened, and the overall processing and assembling difficulty of the test equipment is reduced, the open circuit condition can be reduced under the condition of conventional processing and assembling precision and the test reliability and stability are improved.

The invention discloses a device and method for monitoring the damping effect of an elastic support of a gearbox of a wind turbine generator, and belongs to the technical field of state monitoring of the wind turbine generator. According to the vibration characteristics of the gearbox and the vibration isolation rule design of the elastic support, filtering processing and multi-band monitoring are carried out on collected signals, comprehensive monitoring is ensured, the monitoring effectiveness can be ensured by performing filtering and frequency-band-division processing on collected signals, and vibration effective values are compared in a targeted manner according to frequency bands, so that the operation state of the elastic support is mastered, the vibration reduction effect is effectively calculated, and the operation state of the elastic support is mastered. Parametric variables involved in calculation are few, calculation errors can be greatly reduced, and robustness is improved. The operation state of the elastic support of the gearbox can be monitored on line in real time, damage to a unit caused by failure of the elastic support is prevented, the predictive maintenance function is achieved, and safe and stable operation of the unit is guaranteed.

The invention discloses a method for processing a gas Raman spectrum, and the processing method comprises the following steps of acquiring a background spectrum, which is a Raman spectrum measured inthe case of introducing the gas without Raman response in a sample tube; acquiring an initial sample gas Raman spectrum of the gas to be tested; modifying the background spectrum based on the initialsample gas Raman spectrum to obtain the modified background spectrum; removing the modified background spectrum from the initial sample gas Raman spectrum to obtain a first sample gas Raman spectrum;performing baseline correction on the first sample gas Raman spectrum to obtain a second sample gas Raman spectrum; and normalizing the second sample gas Raman spectrum. The method provided by the invention effectively solves the problem of poor repeatability and accuracy existing in the acquired Raman spectrums in the prior art, and can obviously improve the repeatability and accuracy of Raman spectrums.

The embodiment of the invention discloses a tag storage bit reading comparison circuit and a tag data reading comparison circuit. The tag storage bit reading comparison circuit comprises an address bit data reading circuit, a target address bit signal input circuit connected with the address bit data reading circuit, and a bit comparison circuit connected with the address bit data reading circuitand the target address bit signal input circuit respectively. According to the technical scheme provided by the embodiment of the invention, the data reading and comparing speed of the tag memory canbe improved.

The embodiment of the invention discloses a flow calculation device and a flow calculation method. The flow calculation device comprises a signal transmitting and receiving module, a transduction module and a control module; the signal transmitting and receiving module is electrically connected with the control module; the signal transmitting and receiving module comprises a signal transmitting end and a signal receiving end; the control module is used for controlling the transduction module to be connected with the signal receiving end and controlling the transduction module to be disconnected with the signal transmitting end so as to measure noise information of a to-be-measured medium and obtain noise components; the control module is further used for controlling the transduction module to be conducted with the signal transmitting end and the signal receiving end at the same time so as to measure flow information of the to-be-measured medium and obtain a measured flow value, and determining a real flow value of the to-be-measured medium according to the noise components and the measured flow value. Therefore, the real flow value of the to-be-measured medium can be obtained by completely removing the noise components when the real flow value is calculated, error interference generated by the noise components in a detection environment is reduced, and the flow calculation precision of the to-be-measured medium is improved.

The invention provides an in vitro dual-dynamic degradation performance monitoring device for a medical magnesium alloy implantable device. The device realizes a controllable environment for simulating the movement of human tissues and organs in vitro of the medical magnesium alloy implantable device through the combined action of a motor, a speed reducer, a rotating disc, a crank connecting rod mechanism, a driving magnetic component, a driven magnetic component and a computer, and the in vitro constant temperature dynamic simulation environment of the medical magnesium alloy implantable device is completed through the combined action of a circulating pump, a flowmeter, a sample tank, a constant-temperature tank, a liquid storage tank, a pipeline and the computer; temperature and pH changes during the in vitro dual-dynamic corrosion degradation process are monitored by using a thermometer and pH meter; the dual-dynamic degradation rate is visually characterized by using a hydrogen evolution method; the degradation performance and the degradation rate are monitored and analyzed by using the combined action of an electrochemical workstation and the computer; and a stable and reliable monitoring device is provided for the in vitro dual-dynamic degradation performance analysis of the medical magnesium alloy implantable device, which greatly improves the possibility of medical industrialization of magnesium alloys.

The invention discloses a six-degree of freedom vibration absolute measuring method based on a triaxial acceleration sensor array, which comprises the following steps of: establishing a sensor array comprising four capacitive triaxial acceleration sensors, directly measuring the three-dimensional acceleration of a measured object at different positions in different directions, and then calculating the three-dimensional linear velocity of the measured object. In the invention, the coordinate of the ground is regarded as a reference, and the sensors are not in direct connection with the reference body, so that the measurement is an absolute measurement; a six-dimensional vibration parameter is obtained by calculating the measured vibration acceleration of a moving body so as to realize a six-degree of freedom compound vibration absolute measurement; and the method has the characteristics of low cost, large dynamic range, fast response, long service life and high reliability. The method disclosed by the invention is suitable for the six-degree of freedom vibration absolute measurement of moving bodies, such as vehicles, ships, airplanes, and the like, which have very complex vibrations in six directions of degree of freedom.

The invention relates to a porous air-suspending supporting system applied to full physical simulation. According to the air-suspending supporting system, a vacuum pre-load with volume reduction hills is adopted for being combined with a porous flow controller; and the porous air-suspending supporting system mainly comprises a vertical guide mechanism, an adjustable supporting transverse beam, a bearing sensor (17) and an air-suspending supporting mechanism (3), wherein the air-suspending supporting mechanism (3) is formed by an air-suspending supporting shell (23), air nozzles (19 and 20) and the porous flow controller (7). The air-suspending supporting shell (23) is formed by air-suspending pressure-sharing structures (7, 22, 24, 25 and 26), a negative pressure vacuum cavity (26) and the volume reduction hills (22). According to the porous air-suspending supporting system applied to full physical simulation, the anti-dumping force is increased so that the system can be more stable; and the system stability is further improved.

The invention discloses an in-vitro double dynamic degradation performance analysis device for a medical magnesium alloy implant material. A base is provided with a computer, an electrochemical workstation, a motor, a sample tank, a speed regulating peristaltic pump and a thermostatic bath. The motor drives a crank mechanism through a belt, a pinion and a large gear. The tail end of the crank mechanism is fixedly connected with the upper end of a swing rod, the lower end of the swing rod is provided with a sample, and the swing rod is inserted into a sample groove. The sample groove, the speedregulating peristaltic pump and a liquid storage tank in the thermostatic bath are in communication with each other to form a circulation flow channel. The sample tank is provided with a first thermometer, a pH meter and a flowmeter, and the liquid storage tank is provided with a second thermometer. The data output ends of the first thermometer, the pH meter, the flowmeter and the second thermometer are connected with the computer, and the control signal input ends of the motor, the speed regulating peristaltic pump and the thermostatic bath are connected with the computer. The electrochemical workstation is connected with electrodes in the sample tank to connect with samples, and the electrochemical workstation is in bidirectional data connection with the computer.

The invention provides a preparation method of a Yunnan pseudo-ginseng standard substance containing heavy metal. The preparation method comprises the following steps: (1), performing baking; (2), performing preliminary grinding; (3), performing screening; (4), performing secondary grinding; (5), performing uniform mixing; (6), performing irradiation: carrying out irradiation sterilization on a Yunnan pseudo-ginseng heavy metal standard substance sample by adopting gamma rays generated by radioactive isotope cobalt-60 with the irradiation dose of 6kGy; and (7), performing sub-packaging and thelike. The Yunnan pseudo-ginseng standard substance candidate with good uniformity and containing heavy metal is prepared; the Yunnan pseudo-ginseng standard substance containing the heavy metal is prepared by checking the uniformity and the stability and using fixing values in multiple laboratories, so that the consistency of a standard curve matrix and a sample matrix is ensured to the greatestextent, the error interference caused by a matrix effect is reduced; and the method has the advantages of high uniformity and stability, accurate measurement value and simplicity in operation.

The invention discloses an aneuploidy biological information analysis method and system, wherein the method comprises: 1) constructing a reference database; 2) calculating UR ratio; 3) constructing statistical parameters of the reference database; 4) calculating Z value; 5) decreasing fetal chromosomal aneuploidy false positives due to microdeletion or micro-duplication present in maternal chromosomes according to the above process of decreasing fetal chromosomal aneuploidy false positives due to microdeletion or micro-duplication present in maternal chromosomes; 6) constructing a fetal DNA concentration prediction model to predict fetal DNA concentration according to the above process of constructing a fetal DNA concentration prediction model; 7) calculating percentage of DNA of each fetal chromosome to total DNA; 8) judging autosomal aneuploidy; 9) judging allosomal anomalies. By using the method and system according to the technical scheme, analytical accuracy is improved greatly.

The invention discloses a device and a method for a continuous test of ground surface settlement induced by shield tunnel excavation, the device can be spliced in any length, and according to the requirement of an actual test purpose, two or more independent sub-devices can be spliced through a connecting device to form a target device. And each sub device comprises a steel frame, a toughened glass observation plate, channel steel, a bottom water inlet pipe, a movable pulley and a connecting device. According to the invention, multiple test working conditions are carried out under a single variable, error interference of temperature difference between working conditions, operation and the like and model test of influence of shield tunnel excavation on ground surface settlement are reduced, and the accuracy of test results is improved; according to the invention, the change rule of ground surface settlement during shield tunnel excavation is explored, and the test efficiency is significantly improved; according to the invention, the water inflow and the water discharge can be controlled, and the law research of shield tunnel excavation on stratum and earth surface soil deformation under saturated and unsaturated states of sandy soil, clay and gravel soil can be simulated; and the deformation rule of the soil body in the shield tunnel excavation process can be conveniently discussed.

The invention discloses a pressure drop flow testing system and method for testing a pipeline flame arrester, and belongs to the technical field of flame arrester performance testing; the pressure drop flow testing system comprises an air supply device, a pressure control device, a pressure drop flow testing device and a controller, wherein the air supply device, the pressure control device and the pressure drop flow testing device are connected in sequence. According to the invention, the pressure drop flow test in the mass standard is realized, the stability is kept at different pressure drop numerical points, the pressure drop parameters can be manually adjusted through the controller; meanwhile, the corresponding flow is read, and the measurement error is reduced.