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1458results about How to "High standard" patented technology

Q345q-series super-thick bridge steel plate and production method thereof

The invention discloses a Q345q-series super-thick guaranteed performance and flaw detection bridge steel plate comprising the following chemical components in percentage by mass: 0.08-0.16 percent of C, 0.20-0.50 percent of Si, 1.15-1.60 percent of Mn, not more than 0.020 percent of P, not more than 0.010 percent of S, not more than 0.12 percent of microalloyed element (V+Nb+Ti+Ni), 0.010-0.050 percent of AlS and the balance of Fe and residual elements; and carbon equivalent is not more than 0.43. The invention also discloses a production method of the steel plate, comprising the steps of rolling, cooling, straightening, cooling in pile and thermal treatment. In the rolling, the cooling and the straightening, the 130 mm super-thick Q345qD(E) steel plate is successfully developed in the production line of a converter, die casting, mill rolling and normalization thermal treatment through carrying out reasonable composition design, die casting, TMCP (Thermal Mechanical Control Process) rolling and thermal treatment; the secondary flaw detection qualification rate reaches 90 percent, the performance initial test qualification rate reaches 100 percent, and the Z-direction performance of the entity of the steel plate can reach Z15 level. The development of the super-thick steel plate satisfies the higher requirements on bridge industry.
Owner:NANYANG HANYE SPECIAL STEEL CO LTD

Individual cylinder fuel control having adaptive transport delay index

An improved individual cylinder fuel control method based on sampled readings of a single oxygen sensor responsive to the combined exhaust gas flow of several engine cylinders. The oxygen sensor output is sampled in synchronism with the engine firing events, a stored non-volatile table of offset values is used to correlate the sampled oxygen sensor values with individual engine cylinders, and a new offset value is determined and stored in place of a current offset value when the current offset value fails to reduce a measure of air / fuel ratio maldistribution among the engine cylinders. In systems having an oxygen sensor of the switching type, the measure of air / fuel ratio maldistribution is determined by filtering and integrating the oxygen sensor signal, and the new offset value is determined by repeatedly incrementing the stored offset value, and fueling the individual cylinders of the engine based on the incremented offset value, until the measure of air-fuel ratio maldistribution decreases. In systems having a wide-range oxygen sensor, the measure of air / fuel ratio maldistribution is determined by summing the air / fuel ratio errors identified by the sensor, and the new offset value is determined by alternately toggling a selected cylinder rich and lean, and sampling the oxygen sensor signal to identify the selected cylinder. Either way, the control adapts the stored offset values for changes that occur over time due to component degradation and variation and changes in engine hardware.
Owner:DELPHI TECH IP LTD

Irregular-island-based method for planning covered flight route of unmanned aerial vehicle

The invention provides an irregular-island-based method for planning a covered flight route of an unmanned aerial vehicle, aiming at the problem of planning an unmanned aerial vehicle flight route in an island domain. According to the method, the characteristics in island flight route traverse are sufficiently considered, i.e. the distance from a take-off point to an island is taken into consideration, particularly for an island which is relatively far away from the coast, the total journey in island flight route planning is influenced by the distance from the take-off point to the island to a large extent. in consideration of a geometric flight route programming method, the distance from the take-off point to the island and other related issues, the invention provides a new optimal circular flight route method and abandons the traditional impractical flight route planning method is abandoned; and situations such as the power of the aerial vehicle in flying are sufficiently considered in the new method. The method mainly comprises four aspects as follows: the extraction of the circumscribed polygon of the island, the calculation of the minimum span of the polygon, the calculation of the minimum distance from the take-off point to the polygon, and the design of the flight route. By utilizing the method, the combination of island monitoring and unmanned aerial vehicle flight route planning is realized, and the method particularly has a wide prospect on the aspect of offshore island monitoring.
Owner:北京中海新图科技有限公司 +1

Experiment-numerical analysis combined determination method for relative permeability coefficient of unsaturated soil

The invention relates to an experiment-numerical analysis combined determination method for the relative permeability coefficient of unsaturated soil. The method comprises simple experiment tests and numerical analyses, the relative permeability coefficient equation of soil under unsaturated state is obtained via simple laboratory experiments and numerical optimization fitting analyses, therefore, the relative permeability coefficient of the unsaturated soil is obtained by calculation. The method is mainly suitable for cohesive soil with a small permeability coefficient. At the same time, the invention provides a numerical analysis procedure which comprises a basic analysis module and an optimization back analysis module, wherein the basic analysis module simulates the dehydration process of test specimens under the condition of a given boundary; the optimization back analysis module takes a determined dehydration mass-time curve as basic input to confirm two parameters Pr and m describing the changes of the relative permeability coefficient of the unsaturated soil along with saturation via an orthogonal optimization method in the numerical analyses. The method is simple in experiments, convenient to operate, wide in usable ranges and good in accuracy; the determined relative permeability coefficient equation can be directly applied to soil engineering structure analyses.
Owner:SHANDONG AGRICULTURAL UNIVERSITY

Robust fault tolerance method of sensor fault of flow control system of aircraft electric fuel pump

InactiveCN107942653AWide range of fuel adjustmentSafe and reliable oil supply on demandSimulator controlAdaptive controlFault toleranceControl system
The invention discloses a robust fault tolerance method of a sensor fault of a flow control system of an aircraft electric fuel pump. A rotating speed instruction adjustment part and a rotating speedcontrol part are arranged. The rotating speed instruction adjustment part provides a proper electric fuel pump rotating speed instruction suitable for an all flow range for the control system based onan engine fuel demand instruction, a fuel flow non-linear steady-state model and an output fuel flow of an electric fuel pump. The rotating speed control part is mainly used for minimizing an error between an actual rotating speed and a rotating speed instruction; and under the circumstance that the uncertainty and the sensor failure are considered, on the basis of an adaptive combined nonlineardynamic model of the electric fuel pump, a sliding mode fault estimator and a sliding mode rotating speed controller are designed comprehensively based on a sliding mode theory, so that the rotating speed response of the electric fuel pump is done quickly and the expected rotating speed is reached accurately; and thus on-demand oil supply for the aero-engine by the electric fuel pump is realized safely, reliably, quickly, and precisely.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Method for pass user to realize safety login application client and system thereof

ActiveCN102469080ASuit one's needsNo additional requirementsTransmissionPlaintextWeb authentication
The invention discloses a method for a pass user to realize safety login application client and a system thereof. The method is characterized by: integrating security controls published by a pass service center on an application client, starting the application client and inputting an account and a password in a security control interface displayed by the application client; acquiring the password by using the security control, carrying out encryption according to a preset encryption algorithm and a stored secret key so as to obtain a cipher and sending the account and the cipher to an application platform server through the application client; forwarding an authentication request to the pass service center by using the application platform; extracting a stored clear-text password according to the account by using the pass service center, carrying out encryption processing which is consistent to the security controls the clear-text password, comparing the encrypted password with the received cipher; if the password is the same with the cipher, passing the authentication. By using the method and the system of the invention, a safety application problem of a pass account service provider under the condition that a network authentication system is mutually independent with a Internet application system can be solved.
Owner:CHINA TELECOM CORP LTD
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