The calculation methods of the transfer coefficient of three francis turbines, namely the external characteristic method based on the comprehensive characteristic curve of the model, the internal characteristic method based on the internal characteristic analysis model and the simple analytical method based on the simplified nonlinear model, are introduced, and the differences between their characteristics and calculation results are analyzed, and it is pointed out that the transfer coefficient calculated by the three methods is close to the rated power point and the difference is large under the light load condition. The obtained transfer coefficient curve is helpful for understanding its variation law.

Combining neural network and fuzzy control, a method for realizing self-learning fuzzy control based on neural network is proposed, and corresponding algorithms for neural network training, controller offline self-learning, and controller online self-learning are given. Using this method, the offline self-learning and online self-learning of the controller can be realized, so as to improve the control performance of the system through the controller self-learning when the control object changes. The simulation results show the effectiveness of the proposed method.

The DSP control method is used to control the input current waveform, which can effectively compensate the harmonic current source and voltage source of the system in real time, and control the high-order harmonics in the power supply and rectifier circuit at the same time. The theoretical calculation and experimental results show that the high-order harmonic compensation effect is good, which can make the power factor of the rectifier circuit close to 1.

Considering the economic and technical requirements of power grid planning and the geometric characteristics of Voronoi diagram, a calculation geometric method for locating new substations and dividing power supply areas based on V-diagram is proposed. By using the influence range characteristics, maximum hollow circle characteristics and local dynamic characteristics of the V diagram, it is possible to ensure that the substation is located in the load center, and realize the automatic optimization of the site selection of the new substation and the optimal division of the power supply area of each substation. This calculation method provides a new research idea for solving the problem of optimal planning of substation. The example results show that the calculation geometry method has certain validity and rationality.

In order to better analyze and describe the static characteristics of the load, the idea of static power load modeling based on spline function is introduced, and the reasons for the large error of the traditional model are pointed out by analyzing the structure of the traditional model. Combined with the related theory of spline function, a load static model based on cubic spline function is proposed, and a modeling method based on spline interpolation is given. Through the simulation calculation of typical loads, it is shown that the load model can adapt to the complex load characteristic description, which provides a new and effective method for the identification of load characteristics under unknown model structure.

The harmonics generated by the AC side of the HVDC transmission system are analyzed, and a parallel active filtering scheme is proposed for the characteristics of the harmonics generated on the AC side of the HVDC transmission system, the active filter adopts the instantaneous reactive power theory for harmonic detection, maintains the stability of the capacitor voltage through PI control, and uses the high-frequency carrier PWM pulse width modulation technology to make the actual output current signal track command current signal. Finally, the dynamic simulation of the active filtering scheme is carried out, and the simulation results show that the active filtering scheme is very effective in filtering out the harmonics generated by the DC side of the HVDC transmission system, and the ideal results can be obtained.

In order for power transformers to operate safely and reliably, it is important to reasonably design the internal insulation structure of transformers, especially the insulation of transformer coils must be able to reliably withstand the effects of atmospheric overvoltage, long-term working voltage, operating overvoltage and transient overvoltage. This paper analyzes the causes of electromagnetic oscillation overvoltage and induced overvoltage when the transformer coil is subjected to the impact voltage, calculates and simulates the wave process of the power transformer, uses the wave process calculation software to design the transformer insulation structure, and finally points out that the wave process calculation is an important basis for the longitudinal insulation design of transformers.

Based on the operation curves of nodal injection power and PV voltage, the differences in iterative calculation and calculation accuracy of several probabilistic power flow models are analyzed, including linearization model, approximate second-order model and complete second-order model. In various models, the correction of variance to mean is taken into account, and the extended Jacobi matrix is also used to consider the voltage curves of the PV point and the equilibrium point. The trial results show that the approximate second-order model that has attracted much attention for a long time cannot guarantee the accuracy of the real variance of voltage, while the voltage mean and variance calculated by the complete second-order model have quite high accuracy.

Tank engine failure is currently backward in maintenance mode, and fault diagnosis is difficult. Through a large number of experimental studies, the vibration mechanism and signal characteristics of common faults of tank engines on the surface of the cylinder block and cylinder head system were obtained, and the signal characteristics of common faults such as valve leakage, engine cylinder pulling and running imbalance were studied, and signal analysis methods such as correlation, frequency domain, and wavelet were selected, and examples of premature fuel injection, abnormal fuel injection, after-combustion type, engine block, and high-pressure oil pipe vibration signal frequency domain analysis proved the applicability and effectiveness of signal characteristics and their analysis methods.

The reaction kinetics of cyclohexene synthesis of 1,2-cyclohexanediol under the action of acidic catalyst were studied, and a kinetic model was established. Under acidic medium, hydrogen peroxide is used as oxidant for cyclohexene oxidation, the apparent kinetic equation is the first level, and the reaction formula is: rA=(dcA)/(dt)=1.594 42×105exp(-(4810.183 86)/(T)))cA, the apparent activation energy of the reaction is 39.992 kJ*mol-1, and the proposed kinetic model is experimentally verified, and the two are in good condition.

Biopolysaccharides are fermented products with viscosities up to 10 Pa*s, which are highly viscosity non-Newtonian fluids. Its decolorization is achieved by mixing with the decolorizing agent, and the common decolorization process is mechanical stirring intermittent production, which consumes a lot of energy and does not have good effect. The use of static mixer can realize the continuous treatment of biological polysaccharides and decolorizing agents, with short mixing time, low energy consumption and good effect. In the process of decolorization, pH value, amount of decolorizing agent and mixing time all affect the effect of decolorization. The corresponding change curve and the regression formula of pressure loss were obtained, and the optimal operating conditions were found.

On the basis of the existing test data of the compressive bearing capacity of masonry, the stress-strain relationship considering the eccentric compression characteristics of masonry is proposed, the flat section assumption and equilibrium relationship are used, and the local compression of masonry is considered, and the additional eccentricity is used to consider the longitudinal bending influence, and the calculation formula of compressive bearing capacity is established, which can be coordinated with the eccentric influence coefficient and longitudinal bending coefficient, which has the advantages of simple calculation, clear concept and wide range of application, and the calculation results are in good agreement with the test results. It also has reference value for the calculation of local compressive bearing capacity of masonry.

The performance of concrete buildings suffering from fire after concrete repair and reinforcement is greatly complicated by many inquantitative factors. On the basis of the experiment, the artificial neural network is used to simulate and predict the splitting strength of the new and old concrete bonding surfaces, and the program calculation results are in good agreement with the test results, and then the bonding strength under different factors is predicted. The results show that the artificial neural network method is used to simulate and predict this topic accurately and effectively, and the influence of various factors on the bonding and splitting strength of new and old concrete is obtained, which is conducive to the supplement and analysis of the test results.

An optimal design model of rainwater pipe system is established, and the genetic algorithm is applied to solve the optimal design scheme with minimal investment in pipe network. In this method, the flow rate of the pipe segment design is taken as the decision-making variable, and the solution of the optimization problem is expressed as chromosomes by floating-point number coding, and the corresponding fitness function, cross operator and variation operator are designed. Compared with the traditional design method, the optimal design scheme obtained by the genetic algorithm can save 19.38% of the investment compared with the original design scheme.The results show that the optimal design of urban rainwater pipe system using GA is a feasible and very effective new method, which can not only find the optimal design scheme, but also provide a variety of optimization design schemes for decision makers, and provide a reliable basis for scheme evaluation and decision-making.

The calculation model of truss arch is suitable for the stress characteristics of reinforced concrete bending members. According to the stress diffusion phenomenon of concrete diagonal stud when pressure is transmitted obliquely in the model, the model is further modified. Referring to the strength criterion of concrete in bidirectional stress state, and combined with the actual engineering situation, a practical calculation formula for shear bearing capacity considering the influence of shear span ratio, span height ratio, vertical abdominal tendon and horizontal abdominal tendon is proposed, and the concrete action term in the formula takes concrete tensile strength as the strength design index, which has been adopted by China’s concrete structure design code. The revised computational model has clear physical concepts and strict mechanical analysis, which has important reference significance for improving the design theory of shear strength of deeply bent members.

The particles in the pipe surge type non-cohesive soil were divided into three groups: skeleton particles, blocking particles and movable particles, and on the basis of analyzing the force of movable particles in the skeleton pores, the total pressure drop was divided into three parts: the pressure drop caused by the skeleton pore wall, the pressure drop caused by the static particles in the skeleton pores and the pressure drop caused by the moving particles, so as to obtain the critical head gradient formula for the starting of movable particles. The verification of the pipe surge test confirms the effectiveness of the formula. The calculation results show that when fine particles are lost, the discontinuous pipe surge soil is more likely to develop into pipe surge failure than the continuous pipe surge soil. At the same time, it is also confirmed that with the loss of movable particles, pipe surge failure can be transformed into flow soil failure.

The No. 8 water intake tower of Xiaolangdi was discretized by using the 21~1 node block unit, and the stress of the arc door section of the working door under the water retaining load was analyzed, and the internal force value of 10 sections and the stress state of the side wall of the lock chamber were calculated. The calculation results show that the bending moment obtained by the detailed calculation increases to different degrees in many places, while the axial force and shear force decrease to a considerable extent. There is a large tensile stress area on the inside of the side wall, the maximum value is 2.08 MPa, and it is recommended that the design unit take other engineering measures to solve the problem of bidirectional tensile stress in the large area of the side wall.

The methods of increasing the strength of Portland cement induced by the addition of fine slag, high aluminum components and hydration hardened slurry were studied by physical property detection, hydration exothermic determination and pore structure determination, and the mechanism of action was discussed. The results show that appropriate amounts of fine high aluminum components, slag components and hydration hardening slurry can significantly improve the strength of Portland cement.

In order to improve the performance of boundary layer ceramic capacitors (GBBLC), BaTiO3 powder coated with CuO was prepared by heterogeneous co-precipitation method, B2O3 and MgO were added to improve the performance of the samples, and a series of samples were prepared according to the preparation process of ordinary electronic ceramics. The density and volume shrinkage of the samples were tested, the microstructure of the samples was analyzed, and the dielectric constant and dielectric loss characteristics of some samples were discussed. The results show that the compactness of the sample is significantly improved, the maximum volume shrinkage rate exceeds 40%, the dielectric constant exceeds 7×104, and the dielectric loss is also significantly reduced. CuO and B2O3 have obvious sintering effect, the sintering temperature can be reduced to 1 100 °C, MgO can improve the performance of the sample, so that the porosity is significantly reduced, and the dielectric properties are also obvious

Through the analysis of the basis point method and the average advanced score method in functional evaluation, and combining the advantages of the two, a new functional evaluation method, namely the average point score method, is proposed. The basic idea is to treat multiple representative functional units as base points, calculate the corresponding average cost or score, and then use this as a standard to find the target cost and value coefficient of other functions. Finally, the results of each functional evaluation method only indicate the direction of improvement of the product or operation, and cannot be equated with the actual problem. Failure to do so will result in an error.

Using the basic theory of game theory, according to the difference in returns generated by the successive actions in enterprise decision-making, it explains the profit advantage of the first mover in market competition, and the reason that the return of those with more information may not be high. Through the bargaining model in benefit distribution, the relationship between risk attitude and expected return in the constant and game was analyzed for three types of enterprises, such as risk appetite, risk neutrality and risk avoidance, and concluded that the two were positively correlated. Finally, it is important to obtain market information, but it is more important to put it into action as soon as possible and take risks in action, so as to obtain the desired return.

By appropriately extending the length of the test section of the wind tunnel and using boundary layer generation devices such as minarets, baffles and rough elements, the atmospheric boundary layer flow field was simulated in the 4 m×3 m aviation wind tunnel, and the average wind velocity profile, turbulence intensity profile and wind spectrum of the simulated flow field were measured. The results show that the simulated atmospheric boundary laminar flow field established in a 4 m×3 m wind tunnel is suitable for building wind load and wind environment model tests.

In the past 50 years, the cause of ecological problems such as land desertification in the Tarim River Basin has been caused by the interference of human activities on hydrological processes. Based on the hydrological data of the monthly time scale, the comparative analysis method was used to analyze the interference characteristics of human activities on the hydrological process of the river basin from the aspects of intra-annual process, inter-annual process and water intake process of runoff. According to the characteristics of water resources development and utilization in the study area, the interference point of human activities on hydrological processes in the river basin was calculated by using mathematical statistics method-ordered clustering method and run test method.

Truncated data is an important research content of survival analysis, and the analysis of pollution data has received more and more attention in recent years. Study the simple regression model: X(0)i=γ+βμi+εi, i=1,2,...,n, where Eεi=0, Eε2i=σ21; However, X(0)1,X(0)2,...,X(0)n is polluted by another independent sequence of uniformly distributed random variables W1,W2,...,Wn, Wi is independent of X(0)i, and only the pollution data Xi=(1-α)X(0)i+αWi,i=1,2,...,n. gives the interval estimation of the regression parameter γ and β.

At present, the main management mode of Chinese IT software enterprises is mainly "project", the level of project management is uneven, and the vast majority of IT software enterprises have more or less "project black holes": the project cannot be completed on schedule, the project work is difficult to coordinate, the user needs often change, and the quality of work is difficult to guarantee. This paper analyzes the characteristics of IT software projects, points out that the ideal IT software project management mode should include establishing a "project-centered concept, establishing a good communication mechanism and schedule control, and having a high-quality project team", and finally analyzes the prospects of IT software project management.

Taking the structure with elastic support as the object, the structural stiffness matrix is regarded as a linear function of the elastic support stiffness, and based on the generalized inverse eigenvalue theory, the generalized eigenvalue derivative is introduced to give a method to identify the elastic support stiffness of the structure. In this example, using the modal test results, according to the measured natural frequencies of the first three orders, the Newton-Raphson method is used to solve the nonlinear equation system with the supporting stiffness as the parameter, the elastic supporting stiffness is obtained, and the influence of the error of the modal test results on the recognition of the supporting stiffness is analyzed. The error analysis shows that if the modal test results have sufficient accuracy, the structural boundary support stiffness can be accurately identified by this method.

Taking Xuluo Expressway as an example, the noise pollution and traffic flow conditions at multiple points of the highway were measured for many times, and according to the actual measurement results, the noise prediction model in the highway environmental impact assessment specification (trial) was corrected and verified, and the problems that should be paid attention to in this process were discussed. The results show that when the specific traffic volume and model ratio of the highway cannot meet the applicable conditions of the trial specification mode, the mode should be appropriately corrected. For Xuluo Expressway, the correction method should adopt the same speed of all types of vehicles during day and night, without considering the night deceleration, not considering the decrease in speed when the traffic volume is insufficient, and the correction method of fixed speed is adopted for all types of vehicles, so as to obtain better prediction results.