1355 results about "Design values" patented technology

A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.

A semiconductor circuit has a plurality of MISFETs formed with channel films comprised of semiconductor layers on an insulation film. Channel film thicknesses of each MISFET are different. A correlation relationship is fulfilled where concentration per unit area of impurity contained in the channel films becomes larger for MISFETs of a thicker channel film thickness. As a result, it is possible to suppress deviation of threshold voltage caused by changes in channel film thickness. In this event, designed values for the channel film thicknesses of the plurality of MISFETs are preferably the same, and the difference in channel film thickness of each MISFET may depend on statistical variation from the designed values. The concentration of the impurity per unit area is proportional to the channel film thickness, or is a function that is convex downwards with respect to the channel film thickness.

The invention relates to a method for designing gaps of end straight sections of diagonal few-leaf main springs and auxiliary springs, and belongs to the technical field of suspension steel plate springs. The method includes determining endpoint deformation coefficients of the various main springs and deformation coefficients G<x-CD> of contact points of the end straight sections of the N main springs and the auxiliary springs according to structure sizes and elastic modulus of the various diagonal variable-section main springs; acquiring endpoint force F<N> of the N main springs according to acting load of the auxiliary springs and the endpoint deformation coefficients of the various main springs; designing the main and auxiliary spring gaps between contact points of the end straight sections of the main springs and the auxiliary springs according to the thicknesses h<2> of roots of the N main springs, the endpoint force F<N> and the deformation coefficients G<x-CD>. The method has the advantages that as known from simulation verification, design values of the gaps of the end straight sections of the diagonal few-leaf variable-section main springs and the auxiliary springs can be accurately and reliably obtained by the aid of the method, and accordingly the product design level and performance and the vehicle ride comfort can be improved; the design and experiment costs can be reduced, and the product development speeds can be increased.

The invention relates to a method for evaluating the lightning protection performance of transmission lines based on the parametric statistics of lightning. The method comprises the following basic steps: firstly, the information of the transmission lines which require the lightning protection performance evaluation is given; secondly, the ground flash density and the probability distribution statistics of the lightning current magnitude within a specified period are performed to the given transmission lines; thirdly, the lightning-stroke trip-out rate in each section of the transmission lines segmented according to a pole tower within the specified period is calculated; fourthly, a reference value is set according to a design value, a specified value or an operation experience value of the lightning-stroke trip-out rate, and the time difference and the space difference of the lightning protection performance of the transmission lines are evaluated according to the lightning-stroke trip-out rate of each section of the transmission lines and a whole line within the specified period, wherein the lightning-stroke trip-out rate is obtained through the calculation in the step three. The method has the advantages that the evaluation to the lightning protection performance of the transmission lines is performed on the basis of the parametric statistics of lightning with time and space differences; the evaluation result of the method to the lightning protection performance of the transmission lines is more reliable, and has more pertinence; and the evaluation to the lightning protection performance of the transmission lines on different times and different spaces is realized.

The invention relates to a method for calibrating an electrically controlled diesel engine. The software AutoNOx inputs the emission values of nitrogen oxides at each working condition point in an automatically allocated emission region of the electrically controlled diesel engine according to the complete vehicle running features and the like, the AutoNOx software automatically completes the calculation of the emission design values of nitrogen oxides at each working condition point in an engine emission control region according to the factors of engine operating cycle working condition, thetarget torque curve, the complete engine reliability and the like, the calculation result is used as the emission target of one-dimensional thermodynamics GT-Power engine model, and the GT-Power software obtains the main calibration parameters of the engine through internal computations to form basic calibration in the emission control region of the electrically controlled diesel engine. The method is applicable to the development of performance and emission of various electrically controlled diesel engines, and optimal balance between emission and fuel economy in actual working condition is realized.

The invention relates to a method for designing few-leaf oblique line type variable-section main springs in the gaps between oblique line segments and an auxiliary spring, and belongs to the technical field of suspension steel plate springs. According to the structural sizes and the elasticity moduli of the oblique line type variable-section main springs, the endpoint deformation coefficient Gx-Di of each main spring and the deformation coefficient Gx-BC of the Nth main spring at the contact point of the corresponding oblique line segment and the auxiliary spring are determined first; then, according to the required auxiliary spring acting load design value and the endpoint deformation coefficient Gx-Di of each main spring, endpoint force FN of the Nth main spring is obtained; then, according to the thickness h of the root straight section of the Nth main spring, the Gx-BC and the FN, main spring and auxiliary spring gaps between the oblique line segment of the main springs and the contact point of the auxiliary spring are designed. Through simulation verification, it can be known that the main and auxiliary spring gap design value meeting the auxiliary spring acting load requirement can be obtained by means of the method, and the product design level, product performance and vehicle smoothness are improved. Meanwhile, design and testing cost is reduced, and product development speed is increased.

Provided is a prefabricated construction method for a prestressed concrete box girder. Firstly, a prefabricated girder field is constructed; a prefabricated pedestal is manufactured in a prefabricated area; a lateral mold is erected on the pedestal; a steel reinforcement framework is put into the lateral mold; an inner mold and an end mold are installed; then concrete pouring and concrete maintenance are conducted; after the intensity of the concrete reaches 90% of the designed intensity and the maintenance time is longer than 7 days, prestress tension and grouting of a pore canal are conducted; and after the intensity of a grouting test block in the box girder pore canal reaches 90% of the designed value, the grouting test block is moved to a girder storage area. Steel reinforcement machining is conducted through a numerical control steel reinforcement bending machine, so that the machining precision and efficacy of steel reinforcement are improved; an automatic spraying and maintaining system is adopted, so that accuracy of maintenance time and reliability of maintenance quality are ensured; an intelligent tensioning and grouting system is adopted, so that automation and refinement of tensioning and grouting are achieved; a sliding contact line power supply system is adopted, so that power use safety is ensured. The standardization, factorization, intelligence, refinement and automation of the prefabricated construction method for the prestressed concrete box girder are achieved.

The invention relates to a method for measuring and judging insulation aging based on PEA space charges. The method includes the steps that a pulsed electro-acoustic space charge measurement system is built, a space charge test is conducted on an insulating layer of a power cable, statistics is conducted on the absolute charge quantity of the space charges, the currently measured quantity and a threshold value are compared with historical data, and insulation is evaluated by utilizing the total quantity and the charge increased speed to analyze parameters; according to an externally applied high voltage power supply electric field and an insulation internal space charge distribution curve, an electric field intensity method is utilized to analyze insulation of the power cable, when calculated field intensity is higher than a design value, the insulation can be damaged, and the aging degree of insulation can be judged according to the increased speed of the electric field intensity. According to the method, the insulation internal space charges of the power cable are online monitored, and insulation aging of the power cable is evaluated according to data.

The invention discloses a steel structure pre-splicing method and system. When steel structures are pre-spliced, workpiece actual values are measured through a three-dimensional measurement technology and then compared with design models in real time, the design value models are modified to obtain actual value models, the actual value models are pre-spliced, and the factory on-site splicing process is omitted. Sensors are erected on the sections of the steel structures, calibration devices are arranged, probes are used for detecting and touching the sections of steel box girders, the actual value models are compared with the design models, and manufacturing error values are obtained. Virtual splicing can be achieved in software, the measured actual value models are spliced in the software in real time, and the result whether splicing can be conducted or not is visually obtained. By means of the technology, the steel structures are virtually spliced and detected, more reliable guarantees are provided for construction detection, and the site, labor cost and time are saved.

The invention relates to a method for checking a useful load of auxiliary springs of a non-end contact diagonal primary and auxiliary spring, and belongs to the technical field of suspension steel plate springs. The method comprises the following steps: firstly, determining an endpoint deformation coefficient and the half rigidity of each main spring, as well as a deformation coefficient Gx-CB of the contact point between an Nth main spring and the auxiliary spring at an oblique line segment according to a structural dimension and an elastic modulus of the diagonal variable cross-section main spring with non-isostructural end parts; then, checking the useful load of the auxiliary springs of the non-end contact few-leaf diagonal variable cross-section main and auxiliary spring according to the thicknesses of root straight sections of the main springs, Gx-CB of the Nth main spring, the half rigidity of each main spring and a design value of the clearance Delta between the main springs and the auxiliary springs. The simulated verification shows that an accurate checking value of the useful load of the auxiliary springs of the non-end contact diagonal main and auxiliary spring can be obtained by using the method, the design level and performance of products are improved, the vehicle running smoothness is improved, meanwhile, the design, manufacturing and test costs are reduced, and the product development speed is increased.

The invention belongs to the field of flood control safety design of reservoirs, and relates to a method of determining downstream design flood of cascade reservoirs. The method comprises the following steps that by the adoption of the Copula function, multi-dimensional simultaneous distribution of the section flood volume and the regional flood volume of the reservoirs is constructed, the explicit expression of a conditional probability function is deduced, the frequency curve of the conditional probability is dispersed, and according to the principle of probability combination discrete summation, the design value and the corresponding probability of the annular maximum peak discharge of downstream sections are determined after flood regulation is conducted through the cascade reservoirs. The method can overcome the defects of traditional determination technologies of the design flood of the cascade reservoirs, and provides more comprehensive reference information for cascade planning and development of drainage basins.

The invention relates to a limestone-plaster wet method flue gas desulfurization composite synergistic agent, which comprises the following ingredients in percentage by mass: 40 percent to 50 percent of organic acid synergistic agents, 25 percent to 35 percent of organic salt synergistic agents, 15 percent to 20 percent of efficient activating agents, 5 to 10 percent of oxidation catalysts and 1 percent of tracers. The half dissolving time of limestone is shortened by more than 40 percent, and the dissolving speed of the limestone is greatly accelerated, so the activity of the limestone is greatly improved. Under the work condition of the designed surfur content, the circulation intensity of serous fluid can be reduced by one third to one half, the liquid-gas ratio of a system is reduced, the system resistance is reduced, the energy consumption of a desulphurization system is obviously reduced, the utilization rate of limestone and oxidation air is improved, and the scale formation and blockage effects on back-stage equipment are reduced. Under the condition that the coal-fired sulfur exceeds the design value, the utilization rate of the oxidation air can be improved by 50 percent to 60 percent, on the basis without transforming the original oxidative system, the oxidation effect that when the fired-coal surfur content exceeds 20 to 30 percent can be met, and the requirements of the desulfurization efficiency and the clean flue gas SO2 discharge concentration are met.

The invention discloses a reentry flight attack angle guiding method of a sub-orbital vehicle. The method comprises the following steps of: acquiring an attack angle design predicted value through analogue simulation at time intervals; finding the attack angle design predicted value, which keeps a normal overload value of the vehicle always in a fluctuation region of expected normal overload dynamic balance, by using a vehicle homomorphic prediction model in each time interval, so as to realize normal overload dynamic balance at the time interval; acquiring a practical reentry flight attack angle design parameter of the vehicle through the attack angle design predicted value by a fitting method, and determining a reentry flight attack angle design value of the vehicle; and introducing resistance acceleration integration ratio correction at each flight time to make a practical reentry flight resistance acceleration integral value tend to be the same as a predicted resistance acceleration integral value under the attack angle design value, so the reentry flight normal overload of the sub-orbital vehicle is kept to fluctuate in a predetermined region in a dynamic balance section consisting of each time interval and then the aim of reducing the reentry flight normal overload peak value of the sub-orbital vehicle is fulfilled.

The invention relates to an intelligent segmental temperature control system of a wind power blade die, which is provided based on the technical theory that segmental temperature control is bound to be carried out based on the differences on the formed region thickness of a designed blade structure and the energy-saving purpose can be achieved by lowering the dependence on external heating in a curing manufacturing procedure by utilizing the reaction exothermic character of a matrix material. To achieve the purpose, the invention adopts the technical measures of the construction of a die segmental temperature control pipeline, which ensures that each temperature segment can be heated or cooled independently based on requirements on thermal energy in the curing manufacturing procedure; the establishment of an intelligent temperature control system, wherein temperature and hardness data of the die and a blade shell can be captured to judge whether heating setting, exothermic peak initiating temperature and the states of completion degree, gel curing degree and the like are completed or conform to design values; and antecedent technical measures, wherein energy consumption is saved by utilizing the reaction heat of materials per se to heat and reaction and temperature control are combined to match the design of a temperature curve, which are helpful for obtaining the blades with uniform curing and excellent quality and can improve the production efficiency as a characteristic.

The invention discloses a sublevel retreating type two-fluid composite grouting construction method for a deep foundation pit of a sandy gravel stratum. The method comprises the steps of determining a grouting reinforcement scheme; conducting field measuring and setting-out; drilling holes, placing double grouting pipes downwards after the holes are formed, then installing pipe pulling devices, and pulling out drill pipes; preparing grouting fluids; conducting grouting in every other hole, conducting two-fluid composite grouting of the cement-water glass grouting fluid and the modified water glass grouting fluid, and comprehensively considering conversion of the grouting fluids according to changes of the grouting pressure, the flow and grouting positions, wherein the grouting pressure reaches 2MPa or exceeds 3MPa at the same time when the grouting quantity exceeds 80% of the designed value; and after the double pipes are lifted, repeating the grouting process till grouting is finished. The method has the advantages that the phenomenon that the grouting pipes can not be installed due to hole collapse can be avoided; advantages of the two grouting fluids are integrated by composite grouting of the two grouting fluids, waterproof curtains are achieved, meanwhile, the permeability coefficient is low, and the setting strength is high; and the problem that the pipes are pulled difficultly due to grouting fluid backflow is solved.

A gas turbine control method for preventing then operation from deviating from the operating state at the ideal fuel and air flow-rates expected when the gas turbine is designed and maintaining an efficient operating state. A gas turbine control device comprises a frequency analyzing means for analyzing the frequencies inside the combustor of a gas turbine, a state grasping means for grasping the combustion state in the gas turbine on the basis of a state signal representing the result of the analysis by frequency band, the amount of operation process including a ratio between the air flow rate and pilot fuel in the gas turbine, the atmosphere state, and the load amount, a combustion characteristic grasping means for grasping the characteristic of the combustion vibration, and a control section for calculating a correction value of at least either the air flow rate supplied to the combustor or the pilot ratio from the grasped combustion vibration characteristic and the grasped combustion state each time the degree of the combustion vibration exceeds a predetermined control value, correcting the initial design values of the air flow rate and the pilot ratio predetermined correspondingly to the amount of operation process and the state signal, and thereby driving the gas turbine. The control section resets the correction of the initial design values when the degree of combustion vibration of the gas turbine is below the predetermined control value for a given period of time and operates the gas turbine using the initial design values.

The invention discloses a comprehensive calculation method for an energy-saving effect after a steam turbine steam seal modification. In detail, the comprehensive calculation method includes the steps that pressure, temperature, flow and electric power test points are arranged on a steam turbine set thermal system; fed water flows, main steam flows, cold reheat steam flows and reheat steam flows are calculated; steam leakage amount of high pressure cylinder and intermediate pressure cylinder balance disc shaft seals of a set is calculated; the steam leakage amount of the high pressure cylinder and intermediate pressure cylinder shaft seals, the steam inlet amount of a low pressure cylinder shaft seal, pressure of the low pressure cylinder shaft seal and temperature rise of condensation water passing through a shaft seal heater are measured; the test heat rate of the set and a heat rate after a parameter modification are calculated; all parameters of a steam turbine are compared with design values prior to the steam shaft modification, so that the energy-saving effect of the steam turbine steam seal modification is evaluated. Through thermal performance testing performed on the steam turbine, the parameters of the thermal system are tested, and the evaluation and analyzing method for the energy-saving effect after the steam turbine steam seal modification are provided. The method is simple and reasonable, and the calculated result is more accurate.

Disclosed is a substrate for semiconductor package and a wire bonding method using thereof. The substrate is provided with at least one reference mark on its surface to check a loading position and a shift state of a solder mask. The reference mark is composed of a combination of a reference pattern and a solder mask opening and is positioned in any location on an outer peripheral edge of a die attachment region. The reference mark may take various shapes. A method for checking a solder mask shift using the reference mark includes comparing a design value of the reference pattern and the solder mask opening with the reference pattern and the solder mask opening, which are formed in an actual material. After the solder mask shift is calculated, a wire bonding coordinate is newly constructed in consideration of the solder mask shift. This minimizes the wire bonding error.

The invention belongs to the field of tobacco manufacturing and relates to a method for drying cut tobacco. The method comprises the following steps: acquiring predictive factors, wherein the predictive factors comprise preset moisture content of finished cut tobacco, real-time determined data of temperature and humidity in production places and moisture content of blended cut tobacco; inputting the predictive factors into a prediction model so as to obtain a predicted value of the moisture content of the outlet cut tobacco in a cut tobacco drying process; and adjusting process parameters of the cut tobacco drying process according to the predicted value of the moisture content of the outlet cut tobacco in the cut tobacco drying process, wherein the prediction model is established according to historical production data of the finished cut tobacco of multiple batches, and the historical production data comprises the moisture content of the finished cut tobacco, historical determined data of the temperature and humidity in production places, the moisture content of the blended cut tobacco and moisture content of the outlet cut tobacco in the cut tobacco drying process. The inventionfurther relates to a device for predicting moisture content of outlet cut tobacco in the cut tobacco drying process. According to the method disclosed by the invention, the moisture content of the outlet cut tobacco in the cut tobacco drying process is controlled, so that the moisture content of the finished cut tobacco reaches a design value and is kept stable, and the stable cigarette quality is further ensured.