39results about How to "Calculation results are accurate and reasonable" patented technology

The invention discloses a method for calculating the traffic capacity in a city expressway entrance interlacing region, and aims at filling a gap that there is short of a calculation method for effectively estimating the traffic capacity. The method comprises the following steps: 1, collecting related traffic parameters of an expressway interlacing region: 1), the mean time headway (shown in the description) of the traffic flow of an expressway trunk line Ls; 2), a critical time gap tC which allows ramp vehicles to merge into the expressway trunk line Ls; 3), the time headway th between two ramp vehicles; 4), the flow Q of the expressway trunk line Ls; 5), the distance L between a nasal tip N and a merging point of an accelerating vehicle La; 6), the design speed V1 of the expressway trunk line Ls; 7), the design speed V of a ramp; 2, calculating the probability distribution parameter K of the time headway of the expressway trunk line Ls; 3, building a method for calculating the traffic capacity of the ramp R; 4, improving the method for calculating the traffic capacity of the ramp R; 5, calculating the traffic capacity of the interlacing region through employing a formula (shown in the description), wherein CM is the traffic capacity of the interlacing region, the unit is vehicles/hour, and delta t is the time different of the ramp vehicle M2 and a trunk line vehicle M1 (unit is second).

The invention relates to a hydraulic and hydroelectric engineering construction diversion risk analysis technology and aims at overcoming the shortcomings of a traditional high rock-fill dam medium-term food season water retaining risk rate detection technology, providing a novel high rock-fill dam medium-term food season water retaining risk rate detection method, accurately and reasonably quantifying the medium-term food season water retaining risk rate and providing important basis for food season security risk assessment, construction schedule formulation and the like. The uncertainty of flood prevention food season elevation is considered in the method, and a high rock-fill dam project medium-term food season water retaining risk rate mathematical model is established. The uncertainties of shutdown day number and the daily average rising speed each month are considered, and a simulating calculation model of a dam body flood preventing flood season elevation is established. The randomness of the daily average rising speed each month is subjected to quantitative analysis. The randomness of hydroelectric, hydraulic and filling construction is comprehensively considered, and the water retaining risk calculation process is provided by coupling risk elements based on a Monte-Carlo method principle. The high rock-fill dam medium-term food season water retaining risk rate detection method is suitable for high rock-fill dam medium-term food season water retaining risk rate assessment.

The invention relates to a method for calculating gathered passenger numbers of platforms of urban rail transit stations by considering stranded passengers. The method comprises the following steps of establishing a calculation method for a quantity Prz(t) of stranded passengers entering a platform facility and a speed vj(t) of passengers entering the platform when passenger flow entering the platform is unidirectional; establishing a calculation method for a quantity P+rz(t) of stranded passengers entering the platform facility and a speed v+j(t) of passengers entering the platform in an up direction, and a quantity P-rz(t) of stranded passengers and a speed v-j(t) of passengers entering the platform in a down direction when the passenger flow entering the platform is bidirectional; forming passenger flow information by the quantity of the stranded passengers and the speed of the passengers entering the platform; dividing platform types of the urban rail transit stations according to physical structures of the platforms of the stations and position characteristics of the stations in routes; establishing a calculation method for the gathered passenger numbers P(t) of various platforms in combination with the passenger flow information and train running information; and judging passenger flow compositions and types of the platforms, and calculating the gathered passenger numbers of the platforms.

The invention discloses a calculating method of calorie consumed by the bicycle riding. The calculating method is characterized in that the total weight of a bicycle and a rider, the stress area of the wind resistance received by the bicycle and the rider in the riding process and the resistance parameter of the bicycle are obtained through a parameter calibration method, then, the applying work of the bicycle riding in the unit time is calculated, and the work applied during the bicycle riding in unit time comprises the work applied for overcoming the wind resistance, the work applied for overcoming the gravity of the rider and the bicycle, the work applied for changing the kinetic energy of the rider and the bicycle and the work applied for overcoming the bicycle resistance, so the calorie consumed by the bicycle riding is calculated. The calculating method has the advantages that the calorie value consumed by human bodies can be calculated in real time according to different movement environments, and the calculating result is more accurate and reliable.

The invention discloses an impact force calculation method for a viscous debris flow, and application thereof. The calculation method comprises the following steps that: firstly, through sample experiment screening, determining a maximum particle size and a median particle size in a debris flow body, then, through sampling actual measurement, determining debris flow body density and debris flow kinematic velocity, and finally, carrying out calculation to obtain the impact force of the viscous debris flow. By use of the method, the influence of viscous debris flow particle graduation is comprehensively considered, the empirical coefficient of a dynamic pressure impact force calculation formula is corrected through a flume experiment, parameters required by calculation can be obtained through field survey, sampling and experiment analysis, the impact force of viscous debris flow motion can be reasonably determined, a basis is provided for viscous debris flow prevention and treatment engineering, and the method is suitable for the practical engineering design requirements of the viscous debris flow.

The invention discloses a method for determining content of coal pyrolysis resultant. The method comprises (1) obtaining the mass of C, H, O, N and S in 100 g dry ash-free basis coal by employing an element analysis process and respectively recording as mC, mH, mO, mN and mS g, and employing a coal industrial analysis process to measure the caloric value Q[net ,dnf] of combustible substances in dry ash-free basis coal and measure the mass of coke and volatile compounds generated after pyrolysis respectively to be mFC and mV g; (2) calculating the air quantity demanded by combustion of 100 g dry ash-free basis coal to be mA g according to a combustion chemical formula; (3) obtaining the value of a, b and c from a coal pyrolysis formula (1) according to the data in the step (1) by balancing the mole numbers of N and S elements, thereby respectively determining the substance amount of C, N and S elements in coal, and calculating x[i] values according to a formula (14) by employing a process of solving a minimum value of a function, thereby determining the content of H2O, CO, CO2, a hydrocarbon mixture and H2.

The invention discloses a wind-vehicle-bridge full-dynamic coupling analysis method and system. The method comprises the steps that a vehicle-bridge coupling vibration analysis module containing driver behaviors is constructed; an aerodynamic force result on the vehicle and the bridge at the current moment is calculated by adopting FLUENT and is transmitted to the vehicle-bridge coupling vibration analysis module; performing pneumatic simulation and vibration analysis on the aerodynamic force result through a vehicle-bridge coupling vibration analysis module to obtain a vehicle motion state and a track under the combined action of crosswind and a driver, and feeding back the vehicle motion state and the track to FLUENT; and based on a feedback result, adopting FLUENT to calculate an aerodynamic force result on the vehicle and the bridge at the next moment and transmitting the aerodynamic force result to the vehicle-bridge coupling vibration analysis module, and repeating the steps until the calculation is finished. In this way, bidirectional interactive calculation of vehicle aerodynamic force and vehicle state real-time updating is achieved, then wind-vehicle-axle full-dynamic coupling calculation is achieved, and the calculation result is more reasonable and accurate.

The invention discloses an evaluation method of multi-channel ac/dc cross-section transmission capacity and its constraint conditions, which firstly calculates an AC/DC power flow transfer ratio matrix D of the hybrid section and a load rate column matrix eta of an AC line, and then calculates the line load rate matrix lambda after N-1 fault of an AC line occurs according to the matrix, the matrixeta and the rated power of different AC lines; Judging whether the maximum element in the line load rate matrix lambda is 1, adjusting the power flow of the alternating current section according to the judging result, and then calculating the transmission capacity Pa of the alternating current section; Then calculating the transmission capacity Pd of the flexible HVDC section; Finally, determining the transmission capacity and constraint conditions of the hybrid section according to the transmission capacity Pa of the AC section and the transmission capacity Pd of the FDC section. The invention can realize the fast evaluation of the transmission capacity and the constraint conditions of the multi-channel AC/DC parallel section containing the flexible DC, and the calculation time is short,the calculation efficiency is high and the calculation result is more accurate and reasonable.

The invention discloses a shallow soil landslide early warning method based on a digital topographic map, which belongs to the field of landslide prevention and control engineering, and is characterized by comprising the following steps of: a, connecting a straight line with middle points protruding upwards along a contour line of the topographic map to serve as a middle line; b, determining an intermediate point; c, forming three point groups of plane curvature; d, taking the arithmetic mean value of the gradient as the gradient alpha of the landslide mass; e, according to a terrain DEM data distribution principle, assignments of all points in each grid are the same; f, taking an arithmetic mean value; g, calculating a topographic factor T of the potential landslide mass; h, calculating a rainfall factor R; i, calculating a shallow soil landslide early warning judgment value P; and j, performing early warning according to the shallow soil landslide early warning judgment value P. According to the method, the shallow soil landslide can be pre-warned without a large amount of historical observation data of the landslide, the dangerous landslide body is determined in advance, and the disaster prevention applicability and the pre-warning efficiency are greatly improved.

The invention relates to a dynamic critical rainfall calculation method based on an entropy decision method. The method comprises the steps of (S1) collecting and sorting actually-measured accumulatedrainfall and corresponding flood peak flow data of multiple floods in a drainage basin and dividing the data into multiple sample series according to an early-stage soil wetting degree and duration,(S2) performing edge distribution fitting on the collected sample series and selecting distribution with a best fitting effect by using K-S inspection, (S3) constructing joint distribution by utilizing a Frank Copula function to obtain joint probability distribution of accumulated rainfall and corresponding flood peak flows under different early-stage soil wetting degrees and different duration conditions, and (S4) plugging the joint probability distribution and corresponding parameters into a Bayesian utility function and an expected utility-entropy risk function formula, considering conditions of subjective factors, objective factors and the simultaneous influence of the subjective factors and the objective factors, and minimizing the utility function and risk to obtain critical rainfallvalues under different early-stage soil wetting degrees and under different duration conditions. According to the method, a risk decision-making method is used to solve a problem of determining mountain torrent disaster early warning indexes.

The invention discloses a shear force evaluation method for steel beam steel pipe column nodes, in particular a shear force evaluation method for asymmetrical steel beam square steel pipe column nodes. The evaluation method comprises the following steps: (1) presetting the geometrical dimensions of the high and low steel beam square steel pipe column nodes, the type of steel used and the grade ofconcrete; (2) calculating the side length of a concrete core zone and the cross section area of a steel pipe web; 3) determining the shear force of a steel pipe; (4) determining the ultimate compressive bearing capacity of the concrete in the core zone; and (5) superimposing the bearing capacities of a steel pipe column and the concrete in the core zone to obtain the shear force of the core zone of the nodes. The method solves the problem of shear force evaluation of the asymmetrical steel beam square steel pipe column nodes, fills the gap in the calculation method of the shear force of this kind of nodes, can be used as a reference for practical engineering design, and is wider in application and more universal.

The invention discloses a near-dam-area sub-drainage-basin unit division method and device and a storage medium. The method comprises the steps that a near-dam-area water system and a drainage basin are generated based on DEM data; in combination with the generated near-dam region water system and drainage basin, extracting the landform of the near-dam region drainage basin based on DEM data; drawing a rainstorm center map in combination with DEM data and rainfall data, and performing sub-basin unit division on the basin of the near-dam area according to the landform and the rainstorm center map; the method can clearly reflect confluence production modes of different underlying surfaces such as mountainous regions and plains, reflects the influence of a rainstorm center on confluence production, enables sub-basin unit division to be more reasonable, facilitates the consideration of basin confluence production physical characteristics, improves the flood forecasting precision, guarantees the stable and reliable data source, guarantees the accurate and reasonable calculation result, and is suitable for large-scale popularization and application. The method solves the problem of how to divide the watershed of the near-dam area in the humid area, and is beneficial to deep development of sub-watershed division research.

The invention relates to an artificial bee colony algorithm-based steady-state performance evaluation method for a self-excited generator. The method comprises the following steps of (S1) building a single-phase equivalent circuit model for the self-excited generator; (S2) carrying out optimization control on impedance, excitation impedance and a rotating speed of the self-excited generator by using an artificial bee colony algorithm; (S3) calculating stator current, terminal voltage and load current for analyzing a steady-state model of a self-excited induction generator; and (S4) obtaining excitation reactance, frequency and voltage by using a numerical calculation method, comparing the result obtained by using the numerical calculation method with an optimization result obtained by using the artificial bee colony algorithm and verifying the effectiveness of the artificial bee colony algorithm. According to the artificial bee colony algorithm-based steady-state performance evaluationmethod for the self-excited generator, the steady-state characteristic of the self-excited induction generator is researched by using the artificial bee colony algorithm, special requirements for aninitial solution in the numerical calculation method are avoided, a real part of an admittance does not need to be separated from an imaginary part, the calculation process is simplified and the calculation result is more accurate and reasonable.