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618results about How to "Guarantee normal implementation" patented technology

Method for manufacturing high-resolution optical fiber image transmission bundle

ActiveCN101702045APrecise Refractive Index Profile DistributionGuaranteed pixel qualityOptical fibre with graded refractive index core/claddingBundled fibre light guideImage resolutionTower
The invention relates to a method for manufacturing a high-resolution optical fiber image transmission bundle, which comprises the following steps: drawing a preform rod into monofilaments with the diameter of 0.5-3mm; then cutting the monofilaments into a plurality of sections with the same length, cleaning, drying, arranging and molding a proper number of the monofilaments by the close packing way, further placing a thin-walled outer sleeve therein, filling gaps, and further drawing multifilaments with the diameter of 0.5-3mm; cutting the multifilaments into the sections with the same length, corroding the outer sleeve wrapped on the outside of the multifilaments in acid solution, cleaning, drying, and further arranging by the close packing way for becoming a multifilament bundle; placing the multifilament bundle into the thin-walled outer sleeve, and using proper pure silicon dioxide glass filaments for filling the gaps among the multifilaments and between the multifilament bundle and the outer sleeve; and further placing the multifilament bundle in an ordinary drawing tower for drawing the optical fiber image transmission bundle with the diameter of 0.2mm-2mm. The method can manufacture the optical fiber image transmission bundle with high resolution, high pixel and flexibility and is simultaneously characterized by high yield and low cost.
Owner:SHANTOU HIGH TECH ZONE AOXING OPTICAL COMM EQUIP

Optimal duty ratio voltage mismatching control method for current type bidirectional DC-DC converter

The invention discloses an optimal duty ratio voltage mismatching control method for a current type bidirectional DC-DC converter, and belongs to the electric power electronic field. The optimal duty ratio voltage mismatching control is adopted; by regulating the duty ratio and the phase shifting angle between a high-voltage side voltage and a low-voltage side voltage, circuit on-state loss and annular current loss caused by current can be lowered, and meanwhile, the current peak value and power device stress are lowered; in addition, by virtue of an optical duty ratio strategy, the duty ratio is limited and the annular current stage time is reduced, and meanwhile, through voltage mismatching control, a transformer voltage is in mismatching, and a higher junction capacitance charging current before switch-on of a high-voltage side switching tube which is the most difficult in realizing soft switching is achieved, so that realization of soft switching is ensured, and circuit loss is further lowered; and by virtue of the optimal duty ratio voltage mismatching control method, the voltage stress and annular current loss can be lowered, low ripple operation of the circuit input current is realized, the voltage withstand level of the device is lowered, the switch-on loss of the device is lowered, the conversion efficiency is improved, the cost is lowered, and full-load-range soft switching is realized.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Resonance bending fatigue test machine for railway sleepers and application of resonance bending fatigue test machine

The invention discloses a resonance bending fatigue test machine for railway sleepers and application of the resonance bending fatigue test machine, and belongs to the technical field of test machines. The resonance bending fatigue test machine for the railway sleepers comprises a base, two side upright columns, a vibration exciter, a constant-force hydraulic loading system and a control system. The two side upright columns are symmetrically arranged on the upper end surface of the base, force measuring sensors, support blocks and small support plates A are sequentially arranged on the upper end surfaces of the two side upright columns, and a railway sleeper can be supported by the two side upright columns; the vibration exciter is arranged between the two side upright columns, the lower end of the vibration exciter is supported on the upper end surface of the base by a constant-force hydraulic loading mechanism, the upper end of the vibration exciter is fastened and connected with the tested railway sleeper by a fastening support mechanism, and load applied by the vibration exciter acts on a loading location for the tested railway sleeper; force can be loaded on the tested railway sleeper by the constant-force hydraulic loading system via the vibration exciter, and the constant-force hydraulic loading system and the vibration exciter can work under the control of the control system. The resonance bending fatigue test machine and the application have the advantages that test frequencies can be increased by the fatigue test machine on the basis of resonance principles, the test cycle can be shortened, and accordingly the test cost can be saved to a great extent.
Owner:JILIN UNIV

Environmental-protection-oriented ecological reservoir capacity determination method for combined scheduling reservoir group

ActiveCN104047258AEcological storage capacity is reasonableGuarantee normal implementationHydraulic modelsRiver managementGroup scheduling
The invention relates to an environmental-protection-oriented ecological reservoir capacity determination method for a combined scheduling reservoir group, and belongs to the technical field of environmental protection and comprehensive utilization of resources. Firstly, according to river ecological flow and water demand requirements regulated by a river management department, optimization objectives and constraint conditions are determined, a reservoir group ecological water utilization schedule optimization model is established, a weight set with multiple objectives is randomly generated and solved, and an optimal water supply scheme meeting a specific coordination value of the human social economy and ecology water lacking rate is determined; secondly, regulated reservoir capacities needed for water supplement of all reservoirs annually are calculated, and regulated reservoir capacities with the 90% guaranteed rate are selected; at least, regulated reservoir capacities without ecological objectives are worked out, and the difference value of the regulated reservoir capacities without ecological objectives is determined as the ecological reservoir capacity. The method has the advantages that the defect that ecological water supply is not taken into consideration in traditional reservoir group scheduling reservoir capacity setting is overcome, more reasonable reservoir capacity can be obtained according to the reservoir group ecological water utilization schedule optimization model and situational analysis, and implementation of reservoir group ecological scheduling rules is guaranteed.
Owner:TSINGHUA UNIV

Vehicle running information acquisition system and method using dual-processor architecture

The invention discloses a vehicle running information acquisition system and method using a dual-processor architecture. The system comprises a data acquisition unit, a temporary cache unit and a control unit which are connected one another, wherein the data acquisition unit is used for acquiring vehicle running information data in real time and sending the vehicle running information data to the temporary cache unit or the control unit; the temporary cache unit is used for receiving and storing the vehicle running information data acquired by the data acquisition unit in a system starting process and sending the stored data to the control unit after an operating system is started successfully; the control unit is used for receiving and processing the vehicle running information data sent from the data acquisition unit and the temporary cache unit. According to the system, two processors capable of communicating with each other are used, a data acquisition function is independent, a special controller is in charge of real-time data acquisition, the temporary cache unit is configured, and all the vehicle running information data are acquired when the system is started and the controller has other inserted tasks.
Owner:DONGFENG MOTOR CORP HUBEI

Track control method of double-transformer series resonance double-active-bridge DC-DC converter topology

The invention discloses a track control method of a double-transformer series resonance double-active-bridge DC-DC converter topology. The method comprises the steps of firstly designing control tracks of a primary side outer phase shift angle and a secondary side inner phase shift angle of a converter; through the sampling circuit, the high-voltage side voltage and the low-voltage side voltage ofthe converter are sampled. The original secondary side outer phase shift angle and the secondary side inner phase shift angle of a current control variable are calculated through a digital control circuit. According to the control track, the original secondary side outer phase shift angle and the secondary side inner phase shift angle are controlled to move along the track all the time such thatsoft switching conditions and minimum loop current control are guaranteed; the control quantity is output through a drive circuit, and then the converter is controlled to operate. According to the method, the closed-loop control follows a control track based on fundamental wave analysis (FCA) by adjusting a phase shift angle and a high-level duty ratio such that the control flexibility can be greatly improved, the circulating current can be remarkably reduced, the efficiency can be improved, and all soft switches in a full-load range are ensured to be realized.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
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