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140 results about "Clock position" patented technology

A clock position is the relative direction of an object described using the analogy of a 12-hour clock to describe angles and directions. One imagines a clock face lying either upright or flat in front of oneself, and identifies the twelve hour markings with the directions in which they point.

Method for carrying out dynamic balance on aeroplane propeller by dynamic mass center correction method

ActiveCN104019943AThe trimming effect is accurate and reliableReduce the vibration valueStatic/dynamic balance measurementDynamic balancePropeller
The invention relates to a method for carrying out dynamic balance on an aeroplane propeller by a dynamic mass center correction method. The method comprises the steps of dividing a counter weight planned to be arranged at a light point position into two sub-counter weights according to a vector synthesis and decomposition principle, and installing the two sub-counter weights at two adjacent standard installation positions to ensure that the synthesis effect of the two sub-counter weights is equivalent to the balancing effect of the original counter weight planned to be arranged at the appointed light point position; accurately calculating the mass of the sub-counter weights planned to be arranged at the two standard positions by a method of dynamically correcting the mass center positions of the counter weights to improve the calculation accuracy; and accurately calculating a balancing coefficient K of the propeller to be balanced to enable a later balancing process to be rapid. According to the method, the mass of a needed counter weight can be directly calculated by the balancing coefficient according to the measured vibration value, accurate factorization and calculation are carried out, and the counter weight is installed at an appointed standard clock position according to the calculation result, so that balancing is successfully carried out once; the method is simple and convenient, and is independent of work experience of an operator; the balancing effect is exact and reliable.
Owner:宇翔盛泰(北京)航空科技有限公司

Time synchronization method oriented to hierarchical heterogeneous network

ActiveCN104754722ASolve the problem of low time synchronization accuracyReduce loadSynchronisation arrangementTime-division multiplexProtocol overheadTimestamp
The invention relates to a heterogeneous network technology of industrial real-time application, in particular to a time synchronization method oriented to a hierarchical heterogeneous network. A three-layer heterogeneous network consisting of an Internet backbone network, a wireless mesh backhaul network and a field Ethernet sub-network is constructed on the basis of hierarchical thought. An One_step time synchronization mechanism is adopted on the basis of the time synchronization principle of IEEE1588 and a hardware timestamp concept, so that a quarter of synchronization information packet transmission in a network is reduced; the network load is reduced; a hardware timestamp of a wireless network is introduced; and the time synchronization accuracy is increased. A boundary clock positioned on an interface between the wireless mesh backhaul network and a local Ethernet sub-network is designed on the basis of the abovementioned content in order to coordinate the time synchronization between the wireless mesh backhaul network and the local Ethernet sub-network, so that the problem of low time synchronization accuracy of the heterogeneous network due to different network protocols, synchronization information exchange and port inconsistency is solved. At last, whole-network time synchronization is realized by adopting a hierarchical synchronization mechanism. On the basis of existing IEEE1588 and IEEE802.11 protocols, extra protocol overhead is not introduced.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI

Cross clock type circular common-mode inductor winding method

InactiveCN104299770AAvoid influenceThe cross clock winding method is simple and convenientCoils manufactureInductor windingsElectromagnetic interference
The invention discloses a cross clock type circular common-mode inductor winding method. Windings with the same number of turns are wound around the two sides of an amorphous or ferrite or other circular magnetic core; a certain length is reserved at one end of one of the windings, one side of the winding is wound from the six o'clock position to the twelve o'clock position for bottoming, then wound back to the nine o'clock position and then wound back to the twelve o'clock position from the nine o'clock position, and the other side of the winding is wound from the six o'clock position to the nine o'clock position and wound back to the six o'clock position; the same length is reserved at one end of the other winding, one side of the winding is wound from the six o'clock position to the twelve o'clock position for bottoming, then wound back to the three o'clock position and wound to the twelve o'clock position from the three o'clock position, and the other side of the winding is wound from the six o'clock position to the three o'clock position and then wound back to the six o'clock position. The winding method can effectively reduce the bounce phenomenon of the front several turns, and not only can meet the requirements of electromagnetic interference under high frequency, but also greatly improves the labor productivity.
Owner:ZAOZHUANG JINGNENG ELECTRONICS TECH
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