5results about How to "Simplified calculation model" patented technology

The embodiment of the invention discloses a low-orbit navigation enhanced transmitting terminal time difference calibration method, device and equipment and a medium, and relates to the technical field of satellite navigation, and the method comprises the steps: obtaining a low-orbit satellite satellite-borne receiver clock error, ground observation station coordinates, an observation station receiver clock error and other parameters through calculation of observation data of a GNSS satellite; the ground observation station calculates an inter-system deviation between a low earth orbit satellite system corresponding to each low earth orbit satellite and a GNSS system according to the downlink navigation data of each low earth orbit satellite; and selecting one low-orbit satellite as a reference satellite, obtaining the deviation between reference systems, calculating the time deviation of the navigation enhancement transmitting end of the deviation between other systems and the deviation between the reference systems, and compensating the clock error of the corresponding low-orbit satellite based on the parameter. The method can be used for calibrating the relative time difference of each low-orbit satellite navigation signal transmitting end, realizes low-orbit navigation signal time synchronization, is beneficial to improving the positioning, navigation and time service capabilities of a low-orbit satellite system, and provides more accurate services for users.

The present application relates to the technical field of underground structure anti-floating engineering, and aims to provide a prestressed anchor rod arrangement method, device and medium based on virtual stiffness iteration. The present application can simplify the coupling calculation between prestress application and real stiffness of the anchor rod, and through iterative optimization on the virtual stiffness of the prestressed anchor rod and arrangement nodes, the reasonable arrangement of the prestressed anchor rod is realized on the basis of meeting the deformation coordination and vertical stress requirements of the upper structure, and the safety and economy of the anti-floating design of the underground structure are improved.

This invention discloses a weak force sensor based on a teardrop-shaped micro / nano optical fiber and its fabrication method. The sensor comprises a biconical micro / nano optical fiber, a single-conical optical fiber, a quartz capillary tube, and a PDMS microsphere. The biconical micro / nano optical fiber is symmetrically bent, with the central waist region fiber forming a teardrop-shaped ring. The two ends of the teardrop-shaped micro / nano optical fiber ring are sequentially connected to portions of the waist region fiber, a transition region fiber, and a standard fiber. This invention utilizes the sensitive self-sensing capability of micro / nano optical fibers to achieve integrated signal input and output, greatly simplifying the measurement feedback mechanism of the sensing system and reducing overall cost. Furthermore, it is simple and intuitive to operate, reducing the technical requirements for operators. In terms of sensor fabrication, the main raw materials are standard optical fiber and quartz capillary tube, both of which are extremely low-cost. Therefore, this micro / nano optical fiber sensor exhibits significant cost-effectiveness.

The application discloses a kind of multi-limb combined steel support node rotation stiffness calculation methods around weak axis, it is related to the technical field of deep foundation pit engineering and fabricated steel structure;The application decomposes the complex node structure into end plate, connecting plate, bolt group and other mechanical behavior clear core components, and calculates the stiffness of each component by using the component method, and then combines in series and parallel according to the classical mechanics principle, to achieve the technical effect of accurate physical modeling of the semi-rigid characteristics of the node and significantly improving the calculation efficiency.The method avoids complex nonlinear contact analysis, and the calculation formula is clear and easy to program.The calculation results of the method are compared with the full-scale model test results and the fine three-dimensional entity finite element analysis results, which achieves the technical effect of verifying that the calculation error of the method is within the acceptable range of engineering, and proves its reliability, solving the problem of insufficient accuracy of traditional empirical simplified method.

The invention relates to a valve device and a method for regulating the pressure of a fluid. A valve device with a proportional valve is provided, wherein compliance with a certain setpoint or minimum pressure in a volume connectable to the valve device is ensured. The valve device (1) forms the core of the invention, and comprises a proportional valve (2), the proportional valve having an orifice cross section that is continuously variable via an actuator, a sensor device for detecting a valve output pressure, a digital control device, and a switching valve (3) arranged in parallel with the proportional valve (2), wherein the orifice cross section of the switching valve is smaller than the maximum orifice cross section of the proportional valve (2), and wherein the control device is programmed to automatically calculate the maximum achievable working pressure of the proportional valve (2) at the maximum orifice size according to the currently given valve output pressure and the current position of the actuator during operation, and to additionally open the switching valve (3) when the calculated maximum achievable working pressure is below a predetermined setpoint working pressure by a deviation value that can be determined.