39results about How to "Guaranteed speed requirements" patented technology

A real-time visual detection and identification method for high speed rail surface defects comprises the following steps of: (1) image acquisition; (2) image preprocessing; (3) defect preliminary detection, that is, performing logic or operation combination of detection results based on gray scale compensation with detection results based on top-hat operation, and detecting whether an abnormal area exists in an image, if not, finishing the detection, or else continuing the processing; (4) defect accurate positioning, that is, accurately positioning the defect by an algorithm of bonding single defect, an algorithm of filling holes in the defect area, and an algorithm of selecting the main defect, and extracting the defect area through marks; (5) defect classification, that is, extracting and selecting characteristics of the defect area, designing and training a BP neural network, and classifying the defects by the BP neural network. The invention has the advantages of simple principle, high automation degree, high detection speed, and high detection precision.

The invention discloses a cotton fault detecting and identifying method based on a multi-spectrum technology. The method comprises the steps: (1) image acquiring; (2) image pre-processing; (3) the preliminary detection of faults; carrying out edge detection on an improved morphological gradient algorithm to obtain the comprehensive edge detection intensities of all faults to obtain an image with contrast enhancement of all faults; (4) precise location of faults: converting the image into a connected domain image through an improved iterative threshold and morphological processing, precisely locating the faults by selecting a main fault algorithm, and extracting fault areas by marking; (5) cotton ginning quality judgment: carrying out statistics on the amount of all faults, and calculating the total cotton faults to obtain a cotton ginning quality grade. The cotton fault detecting and identifying method provided by the invention has the advantages of being simple in theory, fast in detection speed and high in detection precision.

The invention relates to a NOMA cellular Internet of Vehicles dynamic resource scheduling method based on energy efficiency, and belongs to the field of mobile communication. The method is: in the scenario of a NOMA cellular network supporting V2V communication, according to the reliability of the V2V user, the V2V user delay, the NOMA user rate requirement, and the power limit of the user as constraint conditions, adopting the goal of maximizing long-term average efficiency; creating a random optimization model in combination of subchannel distribution of NOMA users, spectrum distribution ofV2V users and subchannel adjusting strategies. According to the method, the system energy efficiency can be maximized on the premise of ensuring the system stability, and the requirements of V2V usertime delay, reliability and NOMA user rate can be met at the same time.

The invention discloses a combined machining center for stainless steel coiled materials. The combined machining center comprises a paper tape filtering machine and a paper collecting machine. A feeding trolley, an uncoiler, a centering device, a front pinch conveyor, a leveling machine, a hydraulic shear, a gantry spot welding machine, a back grinder, three front grinders, a five-axis straight-grain machine, a non-woven cloth polisher, a cleaning and drying machine, a film pasting machine, a rear pinch conveyor, a hydraulic shear, guide rollers, an edge aligning device, a discharging trolley, a coiler and a paper releasing machine are sequentially mounted behind the paper collecting machine. The combined machining center for stainless steel coiled materials is simple in structure, ingenious and reasonable in design, stable and reliable in quality, and high in machining speed and precision.

The invention discloses a network selection combined bandwidth allocation method in heterogeneous network, and mainly aims at solving problems in coordinated resource allocation among networks of multiple users, and enables a user terminal to obtain higher service rate with lowest network access power. The method comprises the steps that 1) a wireless resource management center gathers environment information sensed by different users; 2) all possible network selection schemes are generated according to the obtained information; 3) the bandwidth is allocated for each scheme, and under the condition of limited resource, the service quality of users is ensured maximally; 4) a scheme which enables the highest total utility function value of the system is selected from all the schemes and serves as a final allocation result; and 5) the wireless resource management center sends the allocation result, and the users, as multi-mode terminals, access the network in a parallel manner and transmit data. The method has the advantages that the utilization rate of system resources is high, the service quality of users can be improved, and stable transmission of services is realized.

The invention discloses a railway vehicle line collision test method. When a vehicle under test starts to carry out a collision test, a test driving vehicle is connected with the vehicle under test through a first coupler; the test driving vehicle pushes the vehicle under test to start and accelerate; when the running speed of the test driving vehicle and the running speed of the vehicle under test reach a specified speed, the test driving vehicle and the vehicle under test operate at a constant speed for a period; when the vehicle under test arrives at the position of an unhooking point, a beacon reading device detects the position of a ground beacon, and sends a fixed-point signal to a ground control station; after receiving the fixed-point signal, the ground control station sends an unhooking instruction to the test driving vehicle, and the first coupler is opened; the test driving vehicle starts braking, and the test driving vehicle is separated from the vehicle under test, the vehicle under test performs idle running until arriving at a collision point, and the test driving vehicle gradually decelerates until stopping. With the railway vehicle line collision test method adopted, the technical problems of failure to realize the remote control of an experimental process, low test safety and low stability of an existing line collision test method can be solved.

The invention relates to a hydraulic system with fast injection loops of a die casting machine. The hydraulic system comprises an injection oil cylinder, a first stage of fast injection loop and a second stage of fast injection loop, wherein the first stage of fast injection loop and the second stage of fast injection loop are mutually independent and connected with each other in parallel, and the connected two ends of the first stage of fast injection loop and the second stage of fast injection loop are respectively connected with the rear chambers of the injection oil cylinder. Each of the first stage of fast injection loop and the second stage of fast injection loop uses an independent accumulator, and the first stage of fast injection loop and the second stage of fast injection loop are not interfere with each other in the working process. The pressure loss of the first stage of fast injection is reduced, and energy is saved. The first stage of fast injection does not consume the pressure oil of the second stage of fast injection accumulator, so that the pressure of the second stage of fast injection accumulator is not reduced, and therefore the speed demand of the second stage of fast injection can be beneficially ensured. The hydraulic system has the characteristics of being simple and reasonable in structure and energy-saving and being beneficial to ensuring the speed demand of the second stage of fast injection.

The invention provides a lubricating oil nozzle with a filtering function. The lubricating oil nozzle with the filtering function comprises a nozzle shell, a nozzle, a spring and a filter screen, wherein the nozzle is at least partially arranged in the nozzle shell, one end of the nozzle is a spray hole, the other end of the nozzle is provided with a plurality of filter holes formed in the radialdirection, and the filter holes communicate with the nozzle; the spring is arranged between the nozzle shell and the nozzle; and the filter screen covers the filter holes, and lubricating oil flowinginto the spray hole is filtered through the filter screen. According to the lubricating oil nozzle with the filtering function, simple filtering before injection can be achieved, foreign matters possibly blocking the nozzle are intercepted, the requirements on the lubricating oil injection speed and flow are effectively met, and safe work of an engine is guaranteed.

The present invention discloses an intelligent driving method for a line collision test drive vehicle. A test drive vehicle is connected with a to-be-tested vehicle by using a first vehicle coupler, aclose-coupled coupler is used for the first vehicle coupler, and the test drive vehicle is used as a track tractor to drive the to-be-tested vehicle to run; during the test, a ground beacon arrangedon the sleeper is identified by a first in-vehicle network control system arranged on the test drive vehicle through a beacon reading device, so that the current position of the test drive vehicle canbe determined, and signals are transmitted through a vehicle wireless reconnection unit to a ground console of a ground control room; and a ground network control system arranged on the ground console transmits a traction, braking or decoupling operation instruction to the test drive vehicle through the ground wireless reconnection unit to remotely control the test drive vehicle to perform a collision test. According to the method provided by the present invention, technical problems that a series of train collision test control processes such as dynamic decoupling must be completed on the test vehicle in the existing line collision test mode with poor test safety and stability can be solved.

The invention relates to a safety interface device for semi-physical simulation, and a design method. The device consists of a simulator interface, a tested photovoltaic system control board interface, a simulation signal adapter board, a digital signal receiving adapter board, a digital signal transmitting adapter board, and a peripheral interface power supply part. The device enables a simulator to be connected with a control board interface of a photovoltaic inversion system, can effectively reduce equipment damage risks caused by software and hardware design and connection errors, can make the most of analog precision of the simulator, provides an addition condition of random noise, provides electrical isolation, and reduces risks caused by external static. Meanwhile, aiming at the difference of simulation sampling of a photovoltaic control board, the characteristics of a digital signal and application voltage ranges of a control board and the simulator, the device especially employs a proper amplifier and a proper optical coupler. The device is quick and effect in application, greatly improves work efficiency, and reduces the possibility that misoperation causes loss. The invention provides a simple, convenient and reliable conversion device and design method for the field of semi-physical simulation.

The invention relates to a node current injection based single three-phase hybrid tide calculation method. The technical feature of the method is that the method includes steps of 1, constructing a single three-phase hybrid model used for power distribution network tide calculation; 2, performing power distribution network calculation by adopting a node current injection method based on the singlethree-phase hybrid model used for power distribution network tide calculation constructed in step 1. According to the invention, influence due to zero sequence and negative sequence components are taken into account, and calculation precision is ensured at the same time of ensuring the calculation speed.

The invention discloses a sub-channel distribution method based on efficacy, and belongs to the technical field of resource distribution in the wireless mobile communication network. The sub-channel distribution method based on efficacy particularly comprises the following steps: determining an initial sub-channel distribution plan, changing the user to which a free sub-channel belongs as the user with the largest rate in the sub-channel on the basis of the initial sub-channel distribution plan, selecting a non-free sub-channel according to the improvable space of the rate from big to small, and carrying out substitution operation on the non-free sub-channel. On the premise of ensuring the requirement of the rate of each user, the method can reasonably distribute sub-channels to the cell users, and enable the total efficacy of a cell to be maximum, thereby improving the energy efficiency.

The invention discloses a multi-stage ladder tooth type mixer for an integrated afterburner, and relates to an aero-engine afterburner. Two stages of mixing sections are arranged, each stage of mixing section is composed of ladder tooth crown-shaped mixers of different sizes, the mixing sections are of an annular structure, the mixing sections are sequentially named as the first-stage mixing section and the second-stage mixing section according to the flowing sequence of outer culvert airflow, and the first-stage mixing section is arranged in the second-stage mixing section; and each stage of mixing section is composed of an inner wall and a ladder tooth crown-shaped mixer, inwards-inclined ladder teeth and outwards-inclined ladder teeth of the ladder tooth crown-shaped mixer are alternately and evenly arranged on the end face of an outlet of each stage of mixing section, when gas flows through the inwards-inclined ladder teeth and the outwards-inclined ladder teeth, the ladder teeth distributed in a staggered mode induce a flow direction vortex, a stable and uniform mixing area is formed at the rear end of the ladder tooth crown-shaped mixer, and mixing of airflow of the inner duct and the outer duct is enhanced. Noise generation is effectively restrained, air flow mixing of inner and outer ducts of an aero-engine is effectively enhanced, mixing efficiency is improved, total pressure loss is reduced, and therefore combustion efficiency of an afterburner is improved.

The invention discloses a robot leg, which aims at solving the problems that the existing heavy-loaded large-scale six-foot robot generally uses a hydraulic cylinder for driving, and the obstacle passing capability of the six-foot robot is limited. The robot leg comprises a blade type swinging hydraulic motor, a robot calf, a robot thigh and a robot base section, wherein the blade type swinging hydraulic rotor comprises a motor casing, a first hydraulic oil inlet and outlet opening, a second hydraulic oil inlet and outlet opening, a flange installing hole and two output shafts. The leg structure is subjected to fire-new design; the bearing and obstacle passing requirements of the heavy-loading large-scale six-foot robot can be effectively met. In the robot leg, on the basis of the robot leg structure improvement, the blade type swinging hydraulic motor is introduced for leg joint driving, so that the defects of small rotating angle and low obstacle passing capability of the conventional hydraulic cylinder driving heavy-loading large-scale six-foot robot can be effectively overcome. The design is ingenious; the design is reasonable; the structure is simple; the use is convenient; high application values and good application prospects are realized.