9results 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.

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 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 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 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.

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.