48results about How to "Does not change the topology" patented technology

The invention discloses an aviation full-duplex exchange Ethernet monitoring processing system which comprises an AFDX exchange device, a terminal and a monitoring device, wherein the monitoring device is connected with a data link node between the AFDX exchange device and the terminal by a monitoring link, and is used for acquiring and processing the data link information of AFDX network transmission. The invention can guarantee the integrity of AFDX network data transmission, saves the memory space of the exchange device, and ensures the stability of the exchange device.

The invention provides a base station and an energy-saving method thereof, a control device and system. The method comprises the steps: the control device receives information sent by the base station in a cooperation set and used for determining the state of the base station; the control device determines a first sending base station set and a first silent base station set according to the information used for determining the state of the base station; and the control device sends second state indication information to the base station in the first silent base station set, wherein the second state indication information indicates that a signal for wireless coverage is sent within set time and a power amplifier used for sending data is closed. The embodiment of the invention can realize that the base station saves energy and avoids covering holes under a multi-cell scene.

The invention discloses a method for controlling NPC three-level inverter fault redundancy. The method for controlling the NPC three-level inverter fault redundancy comprises the following steps of (1) carrying out fault detection on an NPC three-level inverter in real time to confirm a fault position and a fault type, (2) confirming lost voltage vectors according to the fault position and the fault type, and drawing a vector diagram of fault states, (3) analyzing whether the inverter can continue to run or not under the fault states according to the redrawn vector diagram, (4) analyzing whether the inverter can run in an original level or not under the fault states according to the redrawn vector diagram, and (5) for the fault states under which the inverter can continue to run, reselecting resultant vectors, calculating the action time of all the resultant vectors, optimizing the switching sequence of the vectors, and forming a redundancy control impulse train. The method for controlling the NPC three-level inverter fault redundancy solves the problem of reliability of the three-level inverter based on a software method and effectively improves the reliability of the system on the basis that the cost of hardware of the system is not increased.

The invention provides a method for transferring messages in a virtual extensible local area network. An aggregation switch and a core switch forms a first channel for forwarding the messages, first tunnel end point (VTEP) equipment is respectively connected with the aggregation switch and a second VTEP, and the second VTEP equipment is connected with the core switch. The aggregation switch, the first VTEP equipment, the second VTEP equipment and the core switch form a second channel for forwarding the messages. The aggregation switch receives a first message sent by a terminal through an accessing switch, and whether the first message contains a first VLAN identifier is determined. If the first message does not contains the first VLAN identifier, the first channel is determined to forward the first message to an external network. If the first message contains the first VLAN identifier, the second channel is determined to forward the first message to the external network. The invention further discloses an aggregation switch, so that VxLAN and non-VxLAN networks are compatible.

The invention discloses a method for preparing a tantalum (Ta)-doped wolfram (W)-oxide adsorption nano-material. The method is characterized by comprising the following steps: weighing 7-10 parts by weight of sodium wolframate, putting the sodium wolframate into a polytetrafluoroethylene (PTFE) reaction kettle, and adding 7-10 parts of secondary distilled water so as to thoroughly dissolve the sodium wolframate; adding different volumes of tantalum-pentachloride ethanol solutions with the concentration of 0.05mol/L, so as to enable the Ta/W molar ratio of a solution to be 0.01-0.18, and mixing thoroughly; adding 7-10 parts of hydrochloric solution with the concentration of 2-3mol/L and 7-10 parts of ammonium sulfate solution with the concentration of 0.4-0.5mol/L into the PTFE reaction kettle, and stirring for 0.5-1 hour; sealing the PTFE reaction kettle, putting the PTFE reaction kettle into a programmed baking oven, respectively controlling the heating and cooling rates to be 1-2 DEG C/min, carrying out hydrothermal treatment for 24-48 hours at the temperature of 170-200 DEG C, taking out the reaction kettle, cooling to room temperature, washing a reaction product by using distilled water until the reaction product is neutral, putting the reaction product in a freeze drier with the temperature of -40 DEG C, and carrying out freeze drying for 24-48 hours, thereby obtaining the Ta-doped hexagonal-phase wolfram-oxide nano-material.

The invention discloses a method for calibrating parameters of a motor controller without a position sensor. The second step of the method includes connecting a first insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a first resistor and a motor with a power supply in series, conducting pulse width modulation pulse to the first insulated gate bipolar transistor and a second insulated gate bipolar transistor, keeping the lower arm of the second insulated gate bipolar transistor unobstructed so that voltage input at two ends of the motor is product of direct-current bus voltage U and pulse width modulation duty ratio D, testing the first resistor to obtain the value of current I, calculating end resistance of the motor by the U and the I, and dividing the end resistance to calculate stator resistance Rs. The calculation method is shown as follow. By the method for calibrating parameters of the motor controller without the position sensor, topological structure of an inverter of the motor controller cannot be changed.

Provided is a routing method of an overlay network. The routing method of the overlay network comprises the first step of constructing the overlay network, the second step of selecting candidate relay nodes, the third step of selecting relay nodes and the fourth step of carrying out flow cutting. The routing method of the overlay network achieves route relay in an end system to recover physical paths out of work, overcomes the defect that converge time delay of physical layer routing is too long, does not change a topology structure of a physical network and does not change a routing algorithm of the physical network. The routing method of the overlay network is a one-hop overlay network route mechanism which can quickly make a selection after a failure, does not need to backup routing paths, reduces routing loads, and has the advantages of being efficient and quick.

Disclosed is a fault monitoring and forecasting method of direct current (DC)-direct current (DC) power source system, which includes the following steps: combining with electrical characteristics of a DC-DC power source system, respectively providing criterions for power sources when faults occur and when faults are about to occur based on the monitoring and analysis for output voltage of the DC-DC power source system; and beginning to monitor the output voltage after the DC-DC power source system powers on and when the output voltage achieves a steady state and, and monitoring or forecasting the faults based on the criterions. The method has the advantages of being capable of determining the faults which occur to the DC-DC power source system in real time, providing the DC-DC power source system barrier state in three determining clock cycle, and being rapid in alarming and capable of protecting the DC-DC power source system and the load of the system well when faults occur to the DC-DC power source system.

The invention relates to a method and system for detecting short circuit in a vehicle power battery. The method is characterized in that based on the current vehicle battery serial-parallel topology,a current sensor connected in series on a main circuit of a vehicle power battery serial-parallel structure is utilized, a current sensor is connected in series on at least one branch circuit of the vehicle power battery serial-parallel structure, the branch current measured by the current sensor on the branch circuit and the total current measured by the current sensor on the main circuit are then collected, the proportional relationship between the two is obtained, the change in the proportional relationship is detected, the detected change in the proportional relationship is determined through the Kirchhoff's current law to determine whether short circuit occurs in the vehicle power battery. The method is advantaged in that short circuit in the vehicle battery can be rapidly detected, the generation area of short circuit is determined on the basis, and the risk of thermal runaway caused by the internal short circuit of the vehicle battery is effectively prevented.

The invention discloses a steel roof truss damage diagnosis device, which comprises a detachable additional mass block, a dynamic data acquisition system and an intelligent processor. The additional mass block can be used for symmetrically and fixedly clamping a steel roof truss joint, the dynamic data acquisition system can be used for measuring low-order inherent frequency information of vibration of a steel roof truss after mass is added, and the intelligent processor is provided with a steel roof truss damage diagnosis program module and can output damage parameters by means of inputting the measured frequency information. By the aid of the technical scheme, the steel roof truss damage diagnosis device has the advantages that operation is convenient, the additional mass block can be reused, the device is simple, implementation cost is low, normal work of the steel roof truss is unaffected, and the like. Sufficient frequency information can be acquired to meet the need of damage diagnosis, and the steel roof truss damage diagnosis device is easy in operation, convenient in carrying and multi-point acquisition and high in detection and diagnosis accuracy.

The invention discloses a ZnO varistor-based fault discharge device and a control method thereof, and the fault discharge device comprises a current transformer which is used for detecting a current in a power transmission line; a signal processor which is used for processing the current detection signal; a fault bleeder which comprises a main bleeder path and a plurality of secondary bleeder paths, the main bleeder path comprises a first quick switch and at least one ZnO piezoresistor which are connected in series, and each secondary bleeder path comprises a second quick switch and a bleederresistor which are connected in series; and a controller which is used for carrying out closing control on the first quick switch and/or each second quick switch when the current in the power transmission line is greater than the rated breaking current of the circuit breaker, so that the current of the power transmission line is less than or equal to the rated breaking current of the circuit breaker, and controlling the closed quick switch to be disconnected after the circuit breaker is disconnected. The fault discharge device can reduce the protection cost of the power grid fault and improvethe protection effect of the power grid fault on the premise of not influencing the normal operation of the power grid.

The present invention discloses a safety rule configuration method of a firewall without an IP. A firewall without an IP is deposited at the front end of a protected device, a firewall management system does not direct send data to the firewall without an IP when sending a detection data packet and configuring the data packet, and sends data to the protected device, and the data is captured by the firewall to perform identification and processing to complete the safety rule configuration. In order to perform accurate identification of the data packet, the safety rule configuration method of the firewall without an IP takes a special port as a first feature, takes a customized protocol header as a second feature and performs corresponding process aiming at the type of the identified data packet.

The invention relates to a system and method for simulating transceiver signaling based on an online charging environment. The system comprises a signaling separation module, a signaling storage module, a signaling dispatching module and a signaling receiving and sending module. A data file is restored through the signaling separation module to obtain a data packet collected by the system, the data packet is analyzed to obtain signaling data, the signaling data are sent to the signaling storage module one by one, a control instruction sent by the system is processed through the signaling dispatching module, a session instruction is sent to the signaling receiving and sending module, request signaling is searched for and extracted from the signaling storage module through the signaling receiving and sending module and is sent to a target specified by the system, response signaling returned by the target is received and analyzed, and corresponding response movement is carried out. According to the system and method for simulating the transceiver signaling based on the online charging environment, only a small part of attributes irrelevant to the system is modified, simulation validity is improved, test time is shortened, test efficiency is improved, test cost is lowered, and the wide application range is achieved.

The invention discloses a fault-tolerant control method for the short-circuit fault of a power converter in a switched reluctance motor. For the short-circuit fault of a power switch tube in a three-phase asymmetric half-bridge structure, current soft chopper control is used as a basic control algorithm, and the de-rating factor is selected according to different fault conditions. The current overshoot of a faulty phase is restrained by shortening the conduction angle, and the waveform and amplitude of the phase current of a healthy phase are changed in real time to compensate for the adverseeffect of the current of the faulty phase on the output torque. Finally, the voltage across the two ends of the circuit of the conducting phase is locally adjusted by adjusting the duty cycle of the power switch tube in the three-phase circuit, so that the fault torque ripple of the switched reluctance motor system under service in de-rated capacity can be further optimized. The hardware cost is not increased. The control algorithm is simple and feasible, achieves a good fault torque ripple suppressing effect and has good engineering application value.

The invention discloses a steel roof truss damage diagnosis method, which comprises the following steps: 1, optionally selecting a node in a steel roof truss and mounting a detachable additional mass block at the node; 2, measuring the low-order inherent frequency of the vibration of the steel roof truss by using a dynamic data acquisition system after the additional mass block is arranged at the node; 3, detaching the additional mass block, selecting another node of the steel roof truss, mounting the additional mass block at the node, and measuring the low-order inherent frequency of the vibration of the steel roof truss after the additional mass block is arranged at the new position; 4, repeating the process; and 5, inputting the measured frequency information into a compiled steel roof truss damage diagnosis program to obtain a diagnosis result of the steel roof truss damage condition. The steel roof truss damage diagnosis method has the advantages that the operation is convenient, the additional mass block can be repeatedly used, equipment is easy to implement, the cost is low, the normal work of the steel roof truss is not affected and the like, sufficient frequency information can be acquired to meet the requirement for damage diagnosis, and the damage diagnosis is accurate and reliable.

The invention discloses a tracheal tree full-automatic segmentation method based on differential geometry. The tracheal tree full-automatic segmentation method comprises the following steps: 1) carrying out surface modeling of lung CT; 2) calculating a main curvature and a main direction; 3) filtering a non-tracheal area; 4) removing a non-tracheal region; 5) extracting a connected region; 6) removing connected regions with planar shape characteristics; 7) fusing the tracheal tree sets S generated by different CT values, and 8) obtaining an organ tree surface model. The invention belongs to the technical field of tracheal tree full-automatic segmentation, and particularly relates to a tracheal tree full-automatic segmentation method based on differential geometry, which is full-automatic,easy to implement and insensitive to noise images, and segmented tracheal trees are free of leakage and blockage.

The invention relates to a method and a system for space roof truss damage detection. The method comprises the steps that a laser transmitter and a laser receiver are fixedly installed; the laser transmitter transmits to a target node; the laser receiver receives reflected light from the target node; according to the reflected light, vibration information of the target node is acquired; it is judged whether the number of the collected vibration information achieves the preset requirement, if yes, a next step is continued, if no, collecting is continued; according to low order natural mode of vibration of space roof truss vibration, a damage parameter of each unit of the space roof truss is calculated and obtained. According to the method and the system for space roof truss damage detection, by installing a dynamic data acquisition system, topological structure of a structure model can not be changed, by changing the position of the dynamic data acquisition system, enough vibration information can be obtained conveniently to satisfy the needs of damage detection, the defect of insufficient vibration information in an existing method is overcome, and the degree of accuracy of the detection is higher.

The invention discloses a vehicle data processing system and method for multiple parking lots, and the method comprises the steps: enabling license plate recognition equipment to be connected to a router or a switch of each parking lot, searching and finding a camera unit in a local area network based on an ONVIF equipment discovery protocol, and obtaining a video code stream or a video image through a standard RTSP real-time transmission protocol; analyzing the obtained video code stream or video picture through an artificial neural network and a computer vision technology, and extracting license plate data in the video and a real-time video of a corresponding vehicle reservation time length; obtaining a vehicle identification result according to the license plate data and the real-time video; and finally, recording and storing the obtained license plate data and the real-time video in the vehicle identification equipment through a communication unit of the vehicle identification equipment according to a service strategy, and encrypting and reporting the identification result to the cloud data center. Therefore, a universal license plate data acquisition target which can be quickly copied across manufacturers can be realized by utilizing the camera of the existing vehicle identification equipment, and the development cost and period are reduced.

The invention discloses an H-bridge five-level active neutral point clamping inverter. The inverter is formed by connecting a left bridge arm and a right bridge arm of a five-level active neutral-point clamped topological structure, the two ends of a direct-current bus of the left bridge arm and the two ends of a direct-current bus of the right bridge arm are connected in parallel and then connected with a first voltage-dividing capacitor Cd1 and a second voltage-dividing capacitor Cd2 respectively, and the first voltage-dividing capacitor Cd1 and the second voltage-dividing capacitor Cd2 areconnected in series. The invention also discloses a dead zone effect inhibition method. The switching state of a high-voltage tube within the dead time of a voltage zero-crossing point is maintained in the previous state, and a follow current path in dead time is changed, so that the 5L-ANPC inverter outputs zero level in the dead time, the multi-level override jump problem caused by the dead effect at the zero crossing point of the output voltage of the active neutral point clamped five-level H bridge is inhibited, and the requirement on the output load dv/dt is reduced.