1190results about How to "Improve transmission stability" patented technology

The present application describes embodiments of a neutral density color wheel filter. According to one embodiment, a neutral density color wheel (100) includes an opaque coating (135) over one or more color segments (120, 130, 140, 150, 160, 170) with randomly placed transmissive regions (131). The transmissive regions (131) can be configured to substantially transmit incident light and the opaque coating (135) can be configured to substantially block or absorb the incident light. Alternatively, the transmissive regions (131) can be configured to substantially transmit the incident light. The color segments with opaque coating (135) and transmissive regions (131) substantially eliminate light recycling due to the reflection from the color wheel. The light transmission from the color wheel (100) is independent of the optics of a display system.

The invention discloses a network coding cooperative communication method based on polarization codes, and belongs to the technical field of network coding. The method comprises the following steps of constructing a polarization code generation matrix GP, setting polarization code parameters N and K based on the number of relay nodes of the network and the number of users, and constructing a polarization code generation matrix GP again based on N and K, wherein N expresses the code length, K expresses the length of information bits, each column of the matrix GP corresponds to one relay node, and each row of the matrix GP corresponds to one user; receiving information sent by the users through the corresponding relay nodes based on the matrix GP; when the jth column and the ith row of the matrix GP are 1, receiving the information sent by the user corresponding to the ith row through the relay node corresponding to the jth column; carrying out binary domain addition on the received information by the relay nodes, and then sending the information to a receiving end; arranging the N received relay information rj in sequence by the receiving end to form a polarization codeword, and carrying out coding on the polarization codes. The method is used for the network coding, and can reduce transmission error rate and improve the network transmission stability.

The invention discloses a method for optimizing the video quality of service (QoS) of a video wireless transmission monitoring system. In the wireless communication process of a video signal acquisition processing transmission terminal and a video signal receiving play server, the video signal receiving play server counts video stream data packets sent by the video signal acquisition processing transmission terminal in real time, analyzes and judges the data packets, and sends feedback information to the video signal acquisition processing transmission terminal when a video parameter is needed to be adjusted, and the video signal acquisition processing transmission terminal receives the feedback information and adjusts the video parameter. By the method, video resolution and code stream are dynamically adjusted, and the transmission characteristic is controlled in real time, so that the packet loss rate is reduced, the definition of a transmitted frame is increased, the utilization rate of a wireless network is improved, and video transmission quality and stability are greatly improved; therefore, the video wireless transmission monitoring system can adjust video transmission code rate and resolution at different times according to the real-time condition of the network.

The invention relates to a new energy automobile wheel hub valve hole perforation fixture with an automatic positioning function. The new energy automobile wheel hub valve hole perforation fixture comprises a support bottom plate, a rotary device, a fixing device, a clamping device and a hole drilling device. The rotary device is mounted on the top of the support bottom plate, the fixing device ismounted on the top of the rotary device, the clamping device is connected with the support bottom plate, and the hole drilling device is mounted on the clamping device. The new energy automobile wheel hub valve hole perforation fixture has the advantages that the difficult problems of incapability of fixing existing wheel hubs for existing wheel hub structures when existing valve holes are drilled in the existing new energy automobile wheel hubs in certain factories, incapability of firmly fixing the existing wheel hubs, deviation when the existing wheel hubs rotate under the control, requirements on manually polishing the existing valve holes and the like at present can be solved by the aid of the new energy automobile wheel hub valve hole perforation fixture; the new energy automobile wheel hub valve hole perforation fixture can have functions of stably fixing new energy automobile wheel hubs and drilling and polishing valve holes in the wheel hubs, the wheel hubs can be fixed for wheel hub structures by the aid of the new energy automobile wheel hub valve hole perforation fixture and can be firmly fixed by the aid of the new energy automobile wheel hub valve hole perforation fixture, the wheel hubs can stably rotate without deviation under the control, the valve holes can be automatically polished, and the like.

An air delivery system is provided. The air delivery system includes a PAP device having a flow generator, a patient interface, a processor and a connector, and at least a removable sensing device having at least a sensor, a front-end analog circuit and a connector. The sensor is integrated with the patient interface to measure a respiratory characteristic in a path between the patient's upper airway and the flow generator. When the removable sensing device is separated from the PAP device, the PAP device enters a first operation mode to perform a first preset air delivery behavior, and when the removable sensing device is coupled to the PAP device through the connectors respectively thereof, the PAP device enters a second operation mode to perform a second air delivery behavior for adjusting the treatment pressure in accordance with the respiratory characteristic.

The invention provides a shaping method and a manufacturing method for an involute straight tooth planetary transmission gear. The shaping method comprises the following steps of: acquiring a scheduled load value; obtaining torsion deformation quantity of the tooth width segment of a sun wheel shaft, bending deformation quantity of the tooth width segment of a planetary wheel shaft and elastic deformation of gear teeth of a planetary wheel according to the scheduled load value; determining an initial value of shaping quantity according to the torsion deformation quantity of the tooth width segment of the sun wheel shaft, the bending deformation quantity of the tooth width segment of the planetary wheel shaft and the elastic deformation quantity of gear teeth of the planetary wheel; shaping the involute straight tooth planetary transmission gear in a virtual environment according to the initial value of the shaping quantity; estimating and verifying the shaped involute straight tooth planetary transmission gear; and determining the final shaping quantity according to estimation and verification results. According to the shaping method, the shaping difficulty is low, the shaping quantity is small, unbalanced loading of the engagement of the planetary gear is eliminated, the transmission stability of the gear is further improved, the bearing capability of the gear is enhanced, and the service life of the gear is prolonged.

The invention discloses a star type herringbone gear reducer. The star type herringbone gear reducer comprises a planet carrier, a fixing ring, a sun gear, and a star gear pair formed by a planet gear and an inner gear ring, wherein the teeth of the sun gear, the teeth of the planet gear and the teeth of the inner gear ring in the star gear pair are all herringbone teeth, the sun gear is integrated, an involute spline is arranged in the sun gear, the sun gear is connected with an input shaft through the spline, the inner gear ring is formed by an upper gear ring and a lower gear ring in a combined installation mode, and the fixing gear and the inner gear ring are assembled so that torque output can be achieved. Due to the fact that the herringbone teeth are adopted, the transmission contact ratio is high, and transmission stability, the uniform load performance and the capacity for outputting torque are high; the planet gear is combined, elastic supporting of the planet gear is achieved, transmission stability of a star gear system is improved, and noise is lowered; because combined installation is adopted for the inner gear ring of the reducer and the inner gear ring is provided with the fixing ring in a matched mode, the inner gear ring torque output function is achieved. The star type herringbone gear reducer has the advantages of being simple in structure and convenient and fast to install. The star type herringbone gear reducer is suitable for engine reducers, and especially suitable for high-power engine reducers.

The invention discloses a method for carrying out multimedia navigation on parking in a parking lot. The method comprises the following steps that a multimedia navigation parking information server receives empty and full information of a multimedia navigation parking space server, displays the empty and full information through a multimedia navigation parking information display, and transmits the empty information to a multimedia navigation parking label transceiver server to be stored; the multimedia navigation parking label transceiver server transmits a multimedia navigation parking label with the empty information to a vehicle user needing to park; a parking space server guides the vehicle user to arrive in an appointed parking space and transmits monitoring and timing information to an information server in real time; and the vehicle user returns to a label transceiver server window to carry out procedures of handing over a card and paying the fee and then finishes the whole parking service. The method disclosed by the invention has the advantages of excellent information transmission stability and low system operation cost based on a data of wireless information transmission technology and a video-audio multimedia processing manner. The invention further discloses a system for carrying out the multimedia navigation on the parking in the parking lot.

The invention discloses a multiuser QKD network system based on an M-Z interferometer, and a secret key distribution method thereof. The system comprises a mesh network structure unit and N M-Z type quantum secret key distribution units. The mesh network structure unit comprises public fibers, wavelength router devices and special-purpose fibers. One port of any one wavelength router apparatus is connected with one public fiber and is respectively correspondingly connected with other wavelength router devices through the special-purpose fibers. The N M-Z type quantum secret key distribution units are connected with the mesh network structure unit through the public fibers, and any one M-Z type quantum secret key distribution unit can communicate with other M-Z type quantum secret key distribution units through the mesh network structure unit, such that simultaneous communication among users is realized. The system provided by the invention is simple in integral structure, realizes intercommunication between any two users and among N users, is less influenced by an increase of the user number in terms of single-channel performance, and has quite good full-network expansibility and security.

The invention relates to an automatic positioning, grinding and correcting machining die for a hub of an electric automobile. The die comprises a supporting base plate, a rotating device, a fixing device, a clamping device, a drilling device and a correcting device, wherein the rotating device is arranged on the top of the supporting base plate, a fixing device is arranged at the top of the rotating device, the clamping device is connected to the supporting base plate, the drilling device is arranged on the clamping device, and the correcting device is arranged on the left side of the front end of the supporting base plate. According to the die, the problems that when some existing plants carry out valve hole drilling and flatness detecting on the hub of the electric automobile, the quality of a hub is affected due to the facts that the hub cannot be fixed aiming at the structure of the hub, deviation of positioning of the hub can occur, the hub is not fixed firmly, deviation can occurwhen the hub is controlled to rotate, valve holes are ground manually, and errors occur when a tire seat of the hub is detected can be solved.

The invention discloses a terminal access selection method based on deep reinforcement learning, is applied to the field of communications, and the problem of signal access switching caused by movement of a terminal in a heterogeneous network is solved. According to the invention, various factors such as service quality requirements of different types of businesses and service quality assurance capabilities of different types of access nodes are comprehensively considered; and perception decision making on the current network environment is carried out by adopting a Dep-Q-Learning deep reinforcement learning algorithm, thereby realizing terminal intelligent access selection decision making based on environment and resource perception. The communication experience of the user is effectivelyimproved, and the algorithm has self-adaptability and online learning capability.

The invention discloses a method for fast retransmission and feedback of a radio link control acknowledgement (RLC AM) mode. An RLC layer of a sending terminal sends data to an MAC layer of the sending terminal, while notifies RLC data information to the MAC layer; the MAC layer performs information binding of the RLC data information and an HARQ process identification number of a mixed automatic retransmission request used in a current sending process; the MAC layer of the sending terminal executes an HARQ process and sends data; if acknowledgement (ACK) is received, according to the HARQ process identification number, the RLC data information bound by the HARQ progress is reported to the RLC layer; if negative acknowledgement (NACK) is still received if the maximum HARQ retransmission is carried out, according to the HARQ process identification number, the RLC data information bound by the HARQ progress is reported to the RLC layer; and the RLC layer of the sending terminal receives the acknowledgement (ACK) back-fed from the RLC layer of the sending terminal, and notifies the incident and the corresponding RLC data information to the MAC layer.

The invention discloses a high-speed data transfer board used for geophysical exploration, wherein, a data interface module is connected with an upper level transfer board and a lower level transfer board which are used for receiving and balancing upstream data from a back level transfer board and sending the upstream data to a deserializing module or carrying out preemphasis on sending voltage of the upstream data; the deserializing module and the data interface module are connected to deserialize the upstream data from the back level transfer board, then the converted serial upstream data is sent to a field programmable logic device or the upstream data sent to the up level transfer board is deserialized and then sent to the data interface module; the field programmable logic device and the deserializing module are connected to process and store the upstream data, and the processed upstream data is sent to the deserializing module. The invention can improve the collection capacity of seismic data and the reliability and stability of seismic data collection with long cable and high density.

The invention provides a modification method of a secondary straight-tooth planetary gear. The modification method comprises the following steps: b, determining the load value of gear modification quantity, wherein the load value refers to the interfacial force of a rotating system bearing of the secondary straight-tooth planetary gear in a running state; c, according to the load action of a complex mechanical coupling relationship, obtaining a transmission error curve, and at the same time, obtaining the normal load distribution diagram of the tooth surface of each gear tooth in unit length when the gear is in contact; and d, respectively carrying out profile modification and axial modification on the two different contact surfaces of the planetary gear, and determining modification parameters. According to the modification method of the secondary straight-tooth planetary gear, provided by the invention, the engagement impact of a pinion pair can be reduced under the condition of keeping gear processing precision and saving materials as far as possible, so that the vibration and noise of a planetary gearbox are effectively reduced, and the unbalance load phenomena of planetary gear engagement are greatly reduced; accordingly, the gear transmission stability is improved, the gear bearing capability is improved, the gear service life is prolonged; and the cost is saved, and the hurt of noise to the physical and psychological health of a human body is also reduced.

The invention relates to a large precise numerical control rotating table. The large precise numerical control rotating table comprises a table base, a table spindle, worms and worm gears which are mounted in both sides of the table base and a reducer and a servo motor which are connected with the worm in one side of the table base. The large precise numerical control rotating table is characterized in that the worm in the other side of the table base is connected with the reducer and the servo motor by a coupling so as to form a driven worm gear pair for providing a resistance moment for the table base; and the outer circumference of the table base is provided with a plurality of static pressure support pads, a clearance is left between the lower end surface of the table spindle and the static pressure support pads, three rows of cylindrical roller rotating table bearings are mounted between the table spindle and the table base, and the inner rings of the three rows of cylindrical roller rotating table bearings are provided with steel scales. The invention solves the problems that the rotary positioning accuracy is low, the table runout of the rotating table can not meet the accuracy requirements, the supported workpiece can not bear a large impact force as a result of restricted eccentric center and the like. Besides, the invention greatly improves the transmission smoothness of the rotating table and prolongs the service life of the bearing.

The invention relates to a profile shaping method for machining a cutter tooth main cutting edge according to a cycloid bevel gear, and belongs to the field of machine designing and manufacturing. The method is based on a gear tooth surface machining principle, a gear meshing principle is used, the surface profile of the cutter tooth main cutting edge of a machined tooth surface is modified, and a tooth surface equation is obtained according to space coordinate system changes. A meshing track and a transmission error of a gear tooth machined through a new method is analyzed through a TCA analysis method, and are compared with those of a gear machined through a traditional method, and the gear constructed in the invention is obtained, so that the transmission error is substantially reduced, and meanwhile the better contact track is obtained; and through an experimental verification and analysis method, the constructed gear conducts a loading experiment and analyzes the position of a contact zone, and stress concentration can be avoided through the gear constructed in the invention. Stress concentration during gear meshing is completely avoided, the transmission error is reduced, noise of the gear is reduced accordingly, and the transmission stability is improved.

The invention provides a method for positioning signals of a mobile node user in a commercial center. The method comprises the steps that a three-dimensional space in the commercial center is split into a plurality of sub-spaces, and the sizes of the sub-spaces are determined; wireless access points are placed at the centers of all the sub-spaces, and coordinate values of the wireless access points in the whole three-dimensional space are recorded and determined; a path loss value is calculated according to the strength value of the signals received by the mobile node user; the path loss value is substituted into a visual distance path loss model, and then the distances between the mobile node user and all the wireless access points are calculated; according to the coordinate values of all the wireless access points and the distances, the coordinate position of the mobile node user is determined through a trilateration method. By means of the method, signal coverage blind areas or poor signal coverage areas existing in the commercial center can be effectively reduced or eliminated, the stability of WIFI signal transmission can be effectively improved, and finally the positioning accuracy can be improved.

The embodiment of the invention discloses a data transmission method and related devices. The method comprises steps: an electronic device determines to transmit data of a target application through afirst transmission link, wherein the target application comprises a game application; the round-trip time RTT of the first transmission link is detected; when the RTT is detected to be larger than orequal to a preset RTT, a second transmission link is started; and through the first transmission link and the second transmission link, the data of the target application are transmitted in a shuntedmode. The embodiment of the invention improves the electronic device data transmission efficiency and the stability.