50results about How to "Overcome the shortcomings of low precision" patented technology

The invention relates to a metro conflict early warning method. The metro conflict early warning method comprises the following steps that a topological structure chart of a track traffic network is generated according to planned operation parameters of trains; then, based on the topological structure chart, the controllability and sensibility of train flows are analyzed; according to the planned operation parameters of the trains, conflict-free operating trajectories of multiple trains are generated; at each sampling moment, advancing positions of the trains at a certain moment are predicted based on current operating states and historical position observing sequences of the trains, then an observer used from continuous dynamic states of the trains to disperse conflict logics is established, and the continuous dynamic states are mapped into conflict states expressed by disperse observation values; when a system possibly violates a traffic control rule, hybrid dynamic behaviors of the metro traffic hybrid system are monitored, and warning information is provided for a control center. The metro conflict early warning method predicts metro train trajectories in real time in a rolling mode, effectively early warns train conflict and improves the safety of metro traffic.

The invention relates to an optimal control system for subway traffic flow. According to the system, a topological structure diagram of a rail transit network is generated according to planned operating parameters of trains; controllability and sensitivity of train flow are analyzed on the basis of the topological structure diagram; a multi-train conflict-free operating track is generated according to the planned operating parameters of each train; at each sampling moment, the advancing position of each train in the future time is predicted according to the current operating state and the historical position observation sequence of the train, an observer from continuous dynamics to discrete conflict logics of the train is established, and the continuous dynamics are mapped into conflict states expressed by discrete observation values; when the system possibly breaks the traffic control rule, hybrid dynamic behaviors of a subway traffic hybrid system are monitored, and alarm messages are provided for a control center; finally, when the alarm messages appear, the train operating track is subjected to robust bi-level programming with a self-adaptive control theoretical method, and a program result is transmitted to each train.

The invention belongs to a method for manufacturing a head, in particular to a method for manufacturing a large-sized thin-walled high-precision TC4 titanium alloy head. It is characterized in that it adopts the spinning method of strong spinning, multi-pass general spinning, and strong spinning again, which overcomes the shortcomings of low precision of stamping or forging parts and improves the precision of products; stabilizes between rough turning and finishing turning The processing overcomes the influence of the residual stress of the parts and also improves the precision of the product. In addition, since multiple sets of molds are not required in the manufacturing process, the manufacturing cost is reduced. The invention is suitable for the manufacture of large-scale thin-walled high-precision TC4 titanium alloy.

The invention discloses a drilling geological design method of a compact sandstone lithology gas reservoir horizontal well, and belongs to the technical field of development of natural gas. Geological reservoir data is gathered; and a deploy area earthquake profile map, a sand body thickness chart, an effective reservoir thickness chart, a structural map, a gas reservoir profile map and a trajectory schematic diagram of the horizontal well are established through a technical step of precisely describing the geological reservoir data and predicting the earthquake gas bearing property to realize quantitative representation of reservoir space distribution so as to optimize and determine a trajectory target point of the horizontal well to give out a horizontal section target point design list of the horizontal well so as to provide the basis for the implementation of the horizontal well. The method overcomes the defect of low precision in a traditional geological analytical method, prevents the defects of troublesome operation and high difficulty in an oil and gas reservoir numerical value simulation method, has the characteristic of convenience for operation, and guarantees the sandstone drilling ratio of the drilled horizontal well above 75% and the effective reservoir drilling ratio above 55%.

The invention discloses a real-time monitoring system for concrete abrasion and cavitation depth based on a chirped optical fiber grating. The system includes a concrete structure surface, a chirped optical fiber grating sensor unit, a data communication module, and a computer monitoring unit; the chirped optical fiber The sensor group in the grating sensor unit is pre-embedded in the concrete perpendicular to the concrete surface during the construction of water conservancy and hydropower projects, and the top of the sensor group is flush with the concrete surface. Concrete erosion caused by water flow cavitation and other reasons; the end of the sensor group is connected to the computer monitoring unit through the data communication module, and the data communication module and the computer monitoring unit are connected by serial port. The invention has high testing precision, and its single-point depth measurement can reach sub-mm precision. The invention has the advantages of stable work, accurate information, intuitive display, and expandable use.

The invention discloses a structure fracture non-probability reliability analysis method based on the fractal theory. The method includes the steps that the uncertainty effect of parameters such as load, material characteristics and geometric dimensions under limited sample conditions is considered first, an uncertainty parameter section is quantified, and points are collocated in the uncertainty parameter section; a self-similarity grid and a conventional grid discretization cracked structure are adopted, a point collocation section stress intensity factor analysis model of the cracked structure is set up, and the section range of stress intensity factors is obtained through solution; the uncertainty effect of fracture tenacity is considered, and a non-probability stress intensity factor intervene model is set up to obtain reliability of the cracked structure. The structure reliability is obtained accurately and efficiency, and objective and effective data is provided for structural design.

The invention discloses an indoor voice collection method and device based on adaptive rotation alignment. The device includes a rotatable microphone array, an A / D converter, a D / A converter, a signal processing unit, a USB output and a sound system, and adopts N Each microphone picks up the sound in the room, after quantization and sampling, each signal is returned to the signal processing unit, and the signal processing unit calculates the result and sends it to the stepping motor drive device. The data is processed and handed over to the audio system for playback or USB output. The method includes the steps of locating the sound source, calculating the angle at which the microphone needs to be rotated, merging the digital signals of each microphone, and judging whether the microphone is rotated or not. The invention overcomes the shortcomings of low signal-to-noise ratio and poor precision of traditional sound source signal collection, and has the advantages of high collection precision, wide application range, low cost, simple system installation, and easy control.