17results about How to "Reasonable method" patented technology

The invention belongs to the field of engineering technology risk management, and provides a tunnel and underground engineering safety risk multi-identification intelligent sensing method. The implementation of the method comprises the following steps: firstly, acquiring multi-modal data on a tunnel and an underground engineering structure by using a multi-identification method; constructing and training an engineering safety risk prediction model; and performing dynamic quantitative evaluation on the tunnel and underground engineering safety risk by using the trained engineering safety risk prediction model. According to the method, the multi-recognition perception technology and the artificial intelligence technology are combined, safety risk information in the tunnel and underground engineering can be observed, the method can be applied to safety risk management in the tunnel and underground engineering, the safety risk level of the tunnel in the construction period and the operation period is evaluated, and the safety risk management efficiency is improved. And the safe state of the tunnel and the underground engineering can be expressed quickly and accurately.

The invention provides a group optimization-based space-based angle-measurement-only short arc initial orbit determination method and system. The method comprises the following steps of: 1, setting fixed parameters; 2, initializing particles in the group; step 3, grouping the particles; 4, for all the particles, if the grouping identifier is 0, executing the step 5, otherwise, executing the step 6; 5, performing variation search and update on the particles in multiple directions; 6, updating the particles according to the tracking direction of the particles; 7, calculating a global optimal particle; and 8, repeating the steps 3-7 until a quit cycle condition is met, and outputting the orbit state quantity corresponding to the current global optimal particle. The method is easy to implement, has a certain anti-interference capability, and can stably and effectively solve the space-based angle-only-measurement short arc initial orbit determination problem.

The invention provides a space-based optical observation high-orbit space debris short arc initial orbit determination method and system. The method comprises the steps that S1, angle measurement information of imaging of the same unidentified space debris by a space-based optical observation platform is acquired; s2, acquiring observation data according to the observation capability of the space-based optical observation platform, and setting the upper limit and the lower limit of the distance between the high-orbit space debris and the space-based optical observation platform; s3, calculating an actual observation distance upper limit and an actual observation distance lower limit corresponding to the current observation arc section according to the observation data; s4, randomly initializing a plurality of groups of particles within the upper limit and lower limit range of the actual observation distance; s5, calculating a loss function corresponding to each group of particles; s6, updating each group of particles, calculating a loss function corresponding to the updated particles, and recording each group of optimal particles and global optimal particles; and step S7, repeating the step S6 until the cycle quitting condition is met. The method is easy to implement, and the success rate of determining the high-orbit space debris short arc initial orbit can be increased.

This invention relates to an equivalent accelerated testing method for plexiglass based on creep constitutive equations, belonging to the technical field of accelerated testing of polymer structures. Addressing the testing requirements for the creep performance of plexiglass structures, this invention shortens the testing cycle and saves testing costs through the design of testing temperature and pressure. Simultaneously, the reduced testing time indirectly saves manpower and material resources, and also reduces the frequency of random risks such as power outages and equipment failures. Therefore, the testing method of this invention has significant timeliness and economic efficiency, and can effectively improve the accuracy of quantitative analysis, possessing important value for engineering practice.

The application provides a window tracking method and system suitable for real-time tracking and measurement of small targets in the air. The relative motion relationship between a measurement satellite and a small target in the air is calculated according to the dynamic data of the measurement satellite and the small target in the air within a measurement time, and the angular position change function of the target relative to the satellite measurement camera visual axis is solved. A suitable tracking window is designed within the field of view of the measurement camera. When the target moves out of the tracking window, the visual axis is quickly adjusted within a certain time, and when the visual axis adjustment is completed, the target is just moved to the center position of the field of view, and the visual axis is repeatedly kept-adjusted-kept to complete the window tracking of the cooperative target. The method is reasonable and easy to implement, and solves the problems of continuous adjustment of the tracking visual axis direction and large on-board calculation load when the measurement satellite and the target are moving at high speed in the air.

The present invention belongs to the field of biomedicine, and particularly relates to a method for extracting and preparing total glycosides of icariin and its application in drugs for treating Alzheimer's disease. The total glycosides of icariin are prepared as follows: using icariin as raw material, using a 3%-5% polyamide-amine dendrimer aqueous solution as solvent, 70°C negative pressure wall breaking extraction, secondary filtration, collecting polyamide-amine dendrimer precipitates, 10% ethanol elution to remove impurities, and then 70% ethanol elution, concentration and drying, to obtain icariin with a purity of more than 95%, and it plays an important role in the treatment of Alzheimer's disease. The present invention provides a simple, effective, low-cost large-scale production process technology for total glycosides of icariin.

The present invention provides an optical single-star and double-star combined on-board positioning method and system for aerial moving targets, comprising: solving a target viewing direction sequence with high time resolution of a local satellite, storing the target viewing direction sequence and the corresponding time and local satellite position; receiving a target viewing direction sequence with low time resolution, time and other satellite position from another satellite, and matching the target viewing direction sequence of the other satellite to the target viewing direction sequence of the local satellite in time and space; solving the three-dimensional position of the target by using the dual-star position and viewing direction matched in time and space, and converting it into the longitude, latitude and elevation of a geodetic coordinate system; interpolating the low-time resolution elevation result obtained by solving the dual-star solution to the time corresponding to the target viewing direction sequence with high time resolution of the local satellite of the same target; solving the three-dimensional position of the target by using the target viewing direction sequence with high time resolution of the local satellite, the local satellite position and the target elevation information, and converting it into the longitude, latitude and elevation of the geodetic coordinate system.

The utility model discloses a passive belt cleaning device, which belongs to the technical field of belt conveyors and comprises a driving roller arranged on the upper surface of a return belt. A central shaft of the driving roller is perpendicular to the transmission direction of the return belt; the driven rolling brush is arranged on the lower surface of the return belt; a central shaft of the driven rolling brush is perpendicular to the transmission direction of the return belt; bristles are arranged on the outer surface of the driven rolling brush; driving roller shafts are arranged at the two ends of the driving roller, and driven rolling brush shafts are arranged at the two ends of the driven rolling brush; and the driving roller shaft is connected with a driven rolling brush shaft through a small belt. The belt cleaning device has the advantages of being convenient to install and adjust, free of consumption of energy media such as a power source and compressed air, reasonable in method, good in effect and free of abrasion and scratch to the conveying belt, cleaning points are in elastic contact, and the service life of the belt is effectively prolonged. Normal operation of the conveyor is not interfered in the cleaning process, cleaning can be achieved without shutdown, and production operation is not affected in the cleaning process.

The invention discloses an automatic compensation method for a three-axis magnetic field of an atomic spin inertial measurement device. The method can quickly and accurately compensate the three-axis magnetic field. According to the method, compensation of a Z-direction magnetic field is realized by measuring a three-axis residual magnetic field through a dichotomy, and simultaneous compensation of an X-direction magnetic field and a Y-direction magnetic field is realized through a non-orthogonal decoupling measurement method. The method is reasonable, the experimental operation is simple, the method is suitable for an atomic spin inertial measurement device based on an alkali metal electron spin and inert gas nuclear spin coupling ensemble, the three-axis magnetic field can be rapidly, accurately and automatically compensated in real time, a basis is provided for development of a high-precision atomic spin inertial measurement device, and the workload of device debugging is greatly reduced.

The invention provides a chip optical clock temperature self-adaptive dynamic compensation method, which comprises the following steps of: establishing a temperature working point data framework through a brief data corresponding relation between a chip optical clock temperature working point and frequency stability; a distributed temperature sensor network is established to sense the multi-dimensional temperature of the environment; constructing a dynamic compensation model based on a temperature working point data framework and environment multi-dimensional temperature sensing; based on a correction strategy in dynamic compensation model construction, a corresponding compensation algorithm is designed, and by means of the method, adaptive solving of the optimal temperature working point of the chip optical clock and dynamic compensation of temperature fluctuation are achieved, the working performance directly related to the temperature is improved, and the method is easy to implement, reasonable and easy to operate.

The application provides a high-temperature connecting piece evaluation method and system considering stress relaxation, and relates to the technical field of connecting piece performance detection, and comprises the following steps: determining the type of complex load according to the pre-tightening force of the connecting piece; determining the attribute value of the connecting piece according to the complex load type; obtaining the initial equivalent stress level calculation equation under the type of the complex load according to the attribute value and the stress distribution characteristics of the complex load type; determining the Norton-Bailey constitutive equation coefficients A, stress index m and time index n, establishing the equivalent relaxation theory equation, and obtaining the axial average stress of the connecting piece after relaxation in combination with the composition working condition characteristics of each load in the complex load type; and comparing the axial average stress of the connecting piece after relaxation with the preset minimum clamping limit value to evaluate the connecting piece. The application solves the problem of lacking a stress relaxation calculation method for high-temperature connecting pieces under complex load in the prior art.

The invention provides a large-dynamic-range satellite-borne visible light camera solar altitude correction method and system. The method comprises the steps that 1, the entrance pupil radiance of a visible light camera is calculated; step 2, stray light suppression based on the image is carried out to acquire atmospheric layer top radiance; step 3, carrying out pixel-by-pixel geographic positioning on the visible light camera; 4, calculating the sun position and the earth position of a centroid celestial coordinate system BCRS at the corresponding imaging moment and a conversion matrix from a geocentric celestial coordinate system GCRS to an international terrestrial reference system ITRS; 5, calculating a solar zenith angle cosine value corresponding to each pixel observation print; 6, calculating a correction coefficient of each pixel; and 7, calculating the observation radiance of the large-dynamic-range satellite-borne visible light camera after solar altitude correction. The method can be widely applied to large-dynamic-range satellite-borne visible light camera solar elevation angle correction and radiation quantity correction of covering solar elevation angles close to 0 degree and smaller than 0 degree, calculation is simple, the method is reasonable, and the method is suitable for application.

The utility model discloses a fixing device of a sand-lined iron mold sprue cup, which comprises a sprue cup (3) and a sprue (2), and further comprises a gasket (1), the gasket (1) is arranged between the sprue cup (3) and the sprue (2), the top end of the sprue (2) is provided with a top end boss (21), and the bottom end of the sprue cup (3) is provided with a bottom end boss (31); the top end boss (21) and the bottom end boss (31) are respectively embedded with the gasket (1); the gasket (1) is placed on the top end boss (21) to be embedded, the gasket (1) is taken out after sand coating, the inner structure of a cavity of the sprue (2) is in a step shape, and the cavity can be embedded with the bottom end boss (31). The step-shaped cavity is formed through the gasket and is tightly combined with the boss at the bottom end of the pouring cup, so that the pouring cup is well stabilized, and meanwhile, the sprue is fixed.

The invention relates to a preparation method of 1, 3, 5-tribromobenzene as an intermediate of 1, 3, 5-trimethoxybenzene, which is characterized by comprising the following steps: mixing 2, 4, 6-tribromoaniline (TBA) with a diazotization reagent in a proper solvent to react for 8-48 hours at 20-65 DEG C, and purifying to obtain 1, 3, 5-tribromobenzene (TBB); the diazotization reagent is sodium nitrite; the solvent is one or more of methanol, toluene, ethanol and isopropanol. The method has the advantages that the use amount of a solvent in a synthesis process is changed for the first time, the 1, 3, 5-trimethoxybenzene intermediate TBB is synthesized, 2, 4, 6-tribromoaniline is used as a raw material, and the intermediate TBB is obtained by removing amino through the action of a diazotization reagent; the method is reasonable, simple, easy to operate and high in yield, and the purity meets the quality research requirement.

According to the method for measuring the scale coefficient and the electronic relaxation rate of the atomic spin inertial measurement device, the scale coefficient refers to an angular velocity scale coefficient, first-order approximation and second-order approximation of an output signal relative to a Z-direction magnetic field are measured, and the electronic relaxation rate of the atomic spin inertial measurement device is measured according to linear relations between the first-order approximation and the second-order approximation and between a Y-direction magnetic field and an X-direction magnetic field. The slopes of the two have a relationship with the scale coefficient and the electronic relaxation rate, and the scale coefficient and the electronic relaxation rate are calculated. The method is reasonable, the experimental operation is simple, the method is suitable for an atomic spin inertial measurement device based on an alkali metal electron spin and inert gas nuclear spin coupling ensemble, the scale coefficient and the electron relaxation rate can be accurately measured in real time, and a basis is provided for development of a high-precision atomic spin inertial measurement device.

The present invention discloses an automatic current balancing method for a multi-phase input parallel output parallel dual active bridge converter. Each submodule in the multi-phase input parallel output parallel dual active bridge converter is composed of a first switch circuit, a series inductor, an isolation transformer, a second switch circuit and a DC port side capacitor. A cyclic disturbance parameter estimation algorithm is used to estimate the parameter mismatch of each module. Once the parameters of each module are estimated, the compensation shift ratio of each submodule of the parallel system to meet the current balancing can be calculated, thereby achieving system current balancing. The present invention realizes automatic current balancing of a multi-phase input parallel output parallel dual active bridge converter, so that the power of each submodule is evenly distributed; it can be used in high-power parallel switch power supply occasions such as new energy power generation, electric vehicles, aerospace, uninterruptible power supply, DC power distribution system, energy storage system, etc., and has many advantages such as reasonable method, convenient implementation, good versatility, small size, low cost, etc.

The present invention discloses a material delivery task planning method based on multi-objective optimization, and relates to the field of unmanned aerial vehicle task planning. The present invention first obtains the material delivery task requirements and the performance parameters of the unmanned aerial vehicle group, then sets the unmanned aerial vehicle delivery sequence planning scheme, and sets the unmanned aerial vehicle delivery number constraint conditions based on the material delivery task requirements and the performance parameters of the unmanned aerial vehicle group, and then solves the unmanned aerial vehicle delivery number planning scheme based on the genetic algorithm, and finally completes the material delivery task based on the genetic algorithm solution result and the unmanned aerial vehicle delivery sequence planning scheme. The present invention comprehensively considers the load capacity of the unmanned aerial vehicle, resource consumption and the overall resource scheduling of the unmanned aerial vehicle group, and the method is simple, effective and reasonable.