Through the compressive test of the cube test block, the effects of steel fiber volume rate, steel fiber type, pouring method and fly ash replacement rate on the compressive strength of self-compacting concrete were studied. The results show that the steel fiber improves the compressive strength of self-compacting concrete. Within a certain range of steel fiber volume ratio, vibration improves the strengthening effect of steel fiber on the compressive strength of self-compacting concrete. The compressive strength of self-compacting concrete decreases with the increase of fly ash replacement rate, and gradually increases with the increase of age. On the basis of experimental research, a calculation formula for the cubic compressive strength of self-compacting concrete with fly ash replacement rate of 20% and 30% with age is given.

Through the experimental study of 43 groups of 129 concrete cubes of 100mm×100 mm × 100mm, the changes of bending properties of steel fiber concrete with different volume rates and different strength grades at different carbonization ages were studied, and the influence mechanism of steel fiber on the flexural strength of concrete was discussed. The test results show that when the strength grade of concrete matrix is high, with the increase of carbonization age and steel fiber volume rate, the bending performance of concrete after carbonization is significantly improved, and the relative flexural strength of steel fiber concrete with matrix strength grade C30 and volume rate of 1.0% and 2.0% carbonization for 3 d, 7 d, 14 d and 28 d, respectively, the relative flexural strength is 0.98, 1.11, 0.91, 1.21 and 0.92, 1.24, 1.23 and 1.39, respectively.

In order to study the influence of the stiffness of the steel-concrete composite joint on the seismic performance of the composite frame, the stiffness of the composite joint and its influencing factors are discussed firstly, and then through a multi-layer steel structure engineering example, Ansys finite element software is used to establish the pure steel frame and the composite frame, and four frame models are assumed to be rigidly connected and the joint stiffness is considered, and the multi-encounter seismic response spectrum analysis and elastic time history analysis are carried out, and the calculation and comparison are carried out. The calculation results show that after considering the combined effect of the steel frame, the overall self-oscillation period of the structure becomes shorter and the basic self-oscillation period is reduced by 4.13%, indicating that the overall stiffness of the structure becomes larger. However, after considering the joint stiffness, the seismic period increased, the basic self-vibration period of the pure steel frame and the composite frame increased by 4%, the corresponding seismic displacement became larger, and the layer displacement of the response spectrum analysis terms of the two models increased by 17% and 2%, respectively, indicating that the combined joint stiffness is a non-negligible factor on the seismic performance of the structure.

The harmonic superposition method is used to simulate the downwind pulsating wind pressure acting on the structure, and in order to reflect the relevant characteristics of the pulsating wind pressure acting on different points on the windward surface, the pulsating wind velocity mutual spectral density matrix is first generated, and then the triangulation decomposition method is used to decompose, and then the pulsating wind pressure is generated as the input pulsating wind load, and the dynamic response time history of the structure is calculated by Newmark method. The calculation results of the wind vibration reaction time history of the two high-rise buildings show that the root mean square value of the structural dynamic response obtained by this method is in good agreement with the spectral analysis results used in the building structural load code. The wind vibration reaction is mainly resonant reaction, and the non-resonance reaction value accounts for the secondary part. This is also consistent with the conclusion reached by the spectral analysis method, which shows the accuracy of using the harmonic superposition method to simulate the time history of pulsating wind pressure. This is of great significance for correctly estimating the wind vibration response value of the structure and providing a reference for the design of wind vibration control measures for high-rise buildings.

Through the comparative test of 13 recycled concrete beams and ordinary concrete beams, the effects of recycled aggregate substitution rate and shear-span ratio on the oblique section stress performance of recycled concrete beams were discussed. The test results show that the deformation and oblique crack width of the recycled concrete beam are larger than that of ordinary concrete beam. The failure form of recycled concrete beams is related to shear span, λ≤1 oblique compression failure, 1.5≤λ<3 shear failure, λ≥3.0 diagonal failure occurs.With the increase of recycled aggregate replacement rate, the shear bearing capacity of recycled concrete beams has a downward trend. With the increase of shear span ratio, the shear bearing capacity decreases. On the basis of experimental research, according to the limit equilibrium theory, the calculation formula of the shear bearing capacity of recycled concrete beams is proposed.

Injection mold cooling pipe network calculation can accurately predict the coolant pressure and flow rate of the pipe network. At present, there are two basic calculation methods with shortcomings: the loop method is cumbersome and the iteration speed is slow; However, the traditional nodal method has a singular liquid conduction matrix when the pipeline flow rate is zero. According to the basic equation of pipe network, a new mathematical model is established and an improved node method is proposed. The calculation program block diagram is given, and the computer calculation program is written, the new method effectively overcomes the shortcomings of the traditional method, and the case calculation shows that the analysis and calculation of the injection mold cooling pipe network can be carried out quickly and accurately.

Based on the establishment of the liquid-solid interaction vibration equation of the oil storage tank, the large-scale general finite element analysis software ANSYS was used to analyze and calculate the dynamic response of railway on-board containers under braking. The finite element model of the liquid-solid coupling system of the on-board oil tank is established, and the transient simulation analysis of the fully loaded and no-load oil storage tanks under the braking condition of the train is carried out, and the deformation diagram and the amplitude diagram of the maximum point of mean square stress at different moments of the tank during braking are drawn, and the analysis results of the fully loaded and unloaded vehicle oil storage tanks are compared. The analysis results can provide a reference for the structural dynamics design of the oil storage tank and provide a numerical basis for improving the reliability of the vehicle oil storage tank.

The elastic second-order force performance of the one-layer and two-layer attachment of the attached tower crane is discussed. Taking KZQ2000Z tower crane as the research object, the corresponding simplified calculation model is proposed, and the second-order effect analysis of the simplified model is carried out and compared with the results of the finite element software analysis and calculation, and the maximum difference of the calculation results is 3.9%.The analysis results show that the proposed simplified model can reflect the elastic second-order characteristics of the actual tower crane, and the second-order force characteristics of the tower crane are obvious when the lifting weight is large.

The elastoplastic loading and deformation process of the next superstatic fixed beam under concentrated load is analyzed by the virtual work principle and unit load method. The force deformation can be divided into 4 stages: elastic stage; Plastic deformation stage near the solid branch; Plastic deformation stages occur near the solid branch end and near the concentrated load action point; The solid end is maintained as a plastic hinge, and the plastic zone near the concentrated load action point expands and the plastic zone near the solid support end is unloaded. The bending moment, displacement formula and the relationship between external load and support reaction force at each stage of loading are given, which can be used for engineering structure design.

The principle of field synergy was introduced, its evaluation indicators were discussed, five evaluation methods (simple arithmetic mean angle, volume-weighted average angle, astrometric modular average angle, modulus point product average angle and integral median angle were analyzed), taking the enhanced surface of the air conditioner as an example, a three-dimensional numerical simulation was carried out, and the calculation results showed that the overall change trend of the five synergistic angles was similar, which could reflect the synergy of the velocity field and the temperature field. Qualitative analysis shows that the modular mean angle not only has clear physical significance, but also considers comprehensive factors.

The bonding interface constitutive model is applied to the commercial anisotropic conductive adhesive-bonded specimens, and the cracking of the 90° peel of the specimen is calculated by this model. Through the correction of the bonding interface model, the interface damage factor x is added on the basis of the original interface model, and the calculation formulas of temperature cycle damage factor and high temperature and high humidity damage factor are given according to the experimental data. The damage factor can not only change the maximum stress value of the bond, but also change the displacement of the cracking of the bonding interface. The interface constitutive with damage factor can describe the change of bonding strength of specimens after temperature cycling and high temperature and high humidity test, and the calculation results of this interface damage model are in good agreement with the experimental results.

The flow field characteristics of a stirred reactor were studied by numerical simulation, the K-ε two-equation turbulence model was used to analyze the flow field, and the multiple reference frame method was used to treat the stirring paddle area. The results show that the flow field formed by the improved arc blade has typical radial flow characteristics, and the axial flow is strengthened. Both the standard k-ε model and the RNG k-ε model can predict the maximum axial rate in the stirring tank more accurately, but the results obtained by the RNG k-ε model are more accurate. The turbulent energy in the stirring tank is mainly generated in the area around the blade and the near wall of the tank. However, the area below the blade is weakly affected by the circulating flow, and the K value is relatively small, so the blade should be closer to the bottom of the groove, or a folding blade with an inclination angle of 45° should be used, so as to strengthen the axial conveying capacity of the blade and improve the mixing effect.

Using the CFD (Computational Fluid Dynamics) software FLUENT, the three-dimensional shear effect of the melt section and the metering section of the rubber extruder of the single screw pin barrel is simulated for non-Newtonian fluids. By comparing the shear effect on the cross-section of the screw groove and the cylindrical section of different radii with and without pins, it is found that the pin can strengthen the shear effect on the rubber material in the extruder, which is conducive to reducing the stagnant zone of the root of the screw, and the more pins per row, the greater the shear effect on the rubber material; By comparing the volume-weighted average shear rate of the flow field in the entire fluid region, it is found that the pin can effectively increase the average shear rate by 14%~28%, and greatly reduce the shear inhomogeneity.

L-(2R,3R)-(-)-dibenzoyl tartaric acid monohydrate is an important chiral drug splitting agent, but it is expensive, so we have investigated its synthesis method. Using 2R, 3R-tartaric acid, benzoic acid, thionyl chloride as raw materials, benzoylation with dehydration reaction to generate dibenzoyl tartaric anhydride, and then hydrolysis of acid anhydride to obtain the target product, in terms of tartaric acid, the total yield of dibenzoyl tartaric acid monohydrate is 70.9%, the method uses thionyl chloride to acyllate the reaction generated by benzoic acid and reuse, the reaction yield is high, the post-treatment is simple. The structure of the product was determined by optical rotation, which was consistent with the reported results. The process conditions of this method are easy to control and the pollution is less.

Firstly, the wavelet transform method is used to filter out various interferences in the ECG signal, including power frequency interference, myoelectric interference and baseline drift. Then, the continuous wavelet transform method based on haar is used to extract the R wave peak. Then, according to the needs of doctors’ clinical experience, a scheme for interactive extraction of ST segments is proposed. Finally, the ECG signal generated by the ECG signal generator is experimented, and the experimental results show that the accuracy of locating the R wave peak by continuous wavelet transform method can reach 99.84%, the positioning of ST segment feature points by interactive method is more accurate, and the wavelet transform method filtering has a good filtering effect on low-frequency fundamental drift, which can overcome the signal-noise band overlap.

Based on MATLAB, the gray prediction PID excitation control of synchronous generator is simulated and studied. In the simulation, the Parker model is adopted for synchronous generator, which ensures the non-negativity of the gray prediction original data, simplifies the gray prediction algorithm, discusses the processing of gray prediction under steady-state working conditions and the sampling period of raw data, and solves the problem of gray prediction PID control predicting out of control in steady-state conditions. The simulation results show that compared with the conventional PID control, the overshoot and adjustment time of the gray prediction PID excitation control of the synchronous generator are significantly reduced compared with the conventional PID control under different working points, and the control effect is better than that of conventional PID control.

Aiming at the pure hysteresis control object, a controller design method based on the ITAE standard optimization function is proposed, which equivalents the closed-loop transfer function composed of controller and object to the ITAE best transfer function with ITAE control index, so as to solve the controller parameters. For pure hysteresis objects, the first-order Pade approximation is used to approximate the pure hysteresis link, and the improved system model is given, and the simulation study is carried out under the condition of model matching and mismatch using the ITAE controller, and the results show that the proposed design algorithm is simple and practical, avoids the complex parameter online adjustment process, and has better stability and robustness than the traditional PID control in the case of perturbation of the system model, which shows the better application prospect of this design method.

Based on the nonlinear programming model of reactive power optimization in power system, the original dual internal point algorithm is used for global optimization. In this paper, according to the physical nature of the obstacle parameters and the characteristics of the power system itself, a method is proposed to determine the corresponding obstacle parameters according to the variables of different physical meanings when using the original dual internal point algorithm to analyze the reactive power optimization of the power system. On this basis, the influence of acceleration factor on the algorithm in the obstacle parameters is analyzed, and a dynamic determination strategy of acceleration factor is proposed. The calculation analysis of IEEE118 node system shows that the proposed algorithm has good convergence and fast calculation speed.

The implementation method of induction motor model in EMTP (Electromagnetic Transient Program) and the simulation method of rotor broken strip fault are introduced. The faults of broken bars with different numbers of rotors are simulated, and the changes of rotor current and stator current side frequency components are analyzed. The following conclusions are drawn: after the rotor guide strip is broken, the rotor guide strip current increases; The more broken strips, the more obvious the increase in rotor guide strip current; The closer the guide strip is to the fault location, the greater the current increase, and the farther away the increase is smaller. The edge frequency component in the stator current increases with the increase of the number of broken bars, but the number of broken bars increases to a certain number, but decreases.

The existing progressive mesh generation algorithms are not only inefficient, but also most of them can only complete the simplification of geometric features, and do not consider other surface properties of the mesh model. To solve these problems, a new algorithm is proposed. This algorithm generalizes the quadratic error measure based on the sum of squares of distances from points to a set of planes from three-dimensional geometric space to multidimensional space containing attribute information. This quadratic error measure indicates the degree of matching between the simplified mesh and the geometric characteristics and attribute information of the initial mesh, and uses the principle of minimal quadratic error value to guide the simplification operation of the mesh. Experimental results show that the algorithm not only has high efficiency, but also ensures that the simplified model has high similarity with the initial model in terms of geometric features and color information.

The probability of seed sequences of different weights remaining seed sequences after interweaving was analyzed by probabilistic method, and the influence of low-weight seed input sequences on the low-code redistribution of Turbo codes was discussed. Through analysis and discussion, it is pointed out that if the period of feedback polynomial in the Turbo code generation polynomial is longer, the weight of the codeword generated by the heavy 2 input sequence will be larger, while the weight of other weight seed input sequences, especially the seed input sequence with weight 3 and 4, the weight of the code word produced is likely to be lower than that of the weight of the code word generated by the heavy 2 input sequence. The shorter the length of the interleaver, the greater the probability of this happening.

A layered parallel iterative chaincode tracing line extraction method is proposed. Firstly, based on the hierarchical parallel structure, the image is divided into several independent subregions with increasing radii according to the hierarchy. In the processing of the first layer, based on the existing chaincode tracking method, corresponding improvements are made in the selection of tracking starting point, chaincode tracking processing, and straight-line segment extraction, and the extraction of line segments in each sub-region is realized in parallel. In the upper sub-region, according to the linear segment information of the secondary sub-region, four types of non-overlapping window marker processing are introduced to carry out efficient iterative processing of connection and merging, and realize the acquisition of image straight segments. This method has good real-time and detection accuracy, and maintains the information such as the end point and length of the straight line. Experimental results prove the effectiveness of this method.

Digital control is gradually closely integrated with power electronics applications, and power factor correction is an important application of electronic technology. In the application of high voltage and high power, in order to reduce electromagnetic interference and improve the efficiency of the system, the basic principle and implementation method of digitally controlled Active Power Factor Correction (APFC) are studied, and the overall control scheme of step-up active power factor correction technology in continuous modulation mode is analyzed in detail. In order to verify the correctness of the scheme, a test prototype is set up, and the experiment proves that the power factor correction circuit can stably increase the power factor to more than 0.99 and reduce the total harmonic distortion rate to less than 5%, and the input waveform of the experiment is given in the results.

After simplifying the road surface of the transition section of the road and bridge with the bridge head deck, the analysis model of the vertical vibration system of the road when the vehicle passes through the deck is established. The displacement response, velocity response and acceleration response of the human-vehicle system when the vehicle gets off the bridge are solved and calculated by modal analysis method. The vibration characteristics of vehicles passing through the road and bridge sections were evaluated by using the built human-vehicle road system analysis model. Combined with the characteristics of highway alignment, the relationship between the differential settlement index of the transition section of the road and bridge and the slope difference, bridge deck slope, vehicle speed, load, length and other factors was determined, and finally the allowable slope difference of the transition section of the road and bridge should not exceed 0.4% from the functional point of view.

Taking Hanjiang North Bridge as an example, the design and arrangement of multi-span continuous reclining special-shaped arch bridge is introduced, the system characteristics of the bridge structure are analyzed, and the static calculation of plane and space shows that the design of the whole bridge structure is reasonable, the concrete stress reserve of arch section, boom, tie rod and V-brace box girder is moderate, and each span displacement meets the specification requirements. The dynamic structure analysis of the main bridge is close to the internal and external stiffness of the A, B, and C three-span structures, and the calculation results of the critical load scale factor for solving the first-order instability mode show that the stability coefficient is greater than 1, the possibility of first-class instability of the structure is small, and the spatial stability also meets the requirements.

The ternary tree theory in graph theory is used to construct a class of clocked sequences on GF(2) into sequences with the longest run of only 3 on GF(2), so as to obtain a new sequence with higher linear complexity and stronger randomness.

By discretizing the phonon crystal elements of the two-dimensional arbitrarily shaped scatterer, the numerical integration method is used to solve the integration problem in the solution of its structural function, so as to improve the existing plane wave algorithm, which can calculate the band structure of the two-dimensional arbitrary element structure square lattice phonon crystal. By comparing the band structure of phonon crystals with the regular element structure calculated by the traditional and improved plane wave algorithms in this paper, the correctness of the proposed algorithm is verified. The improved plane wave algorithm can be used to optimize the element structure of two-dimensional phonon crystals, so as to improve their bandgap characteristics.

In the seepage monitoring index, there are serious correlations between reservoir water levels, reservoir water levels and rainfall. The general multiple linear regression is used to establish the seepage monitoring model, and the multiple correlations between the monitoring indicators affect the parameter estimation, expand the model error, and destroy the robustness of the model. In order to overcome the interference of multiple correlations on the model, a partial least squares regression that can distinguish system information from noise is introduced, and a program is compiled. Example analysis shows that the influencing components separated by the partial least squares regression model can make reasonable physical causes for the changes of the measured variables of the dam, and the prediction ability of the partial least squares regression model is far better than that of the ordinary least squares regression model, and the sum of the squared prediction errors of the former is only about one-twentieth of the latter.

Pro/Engineer is used to establish the parametric solid model of the working device of the supercharger, and on this basis, the kinematics model is established to simulate the motion of the working device. First, the connecting rod part of the model is imported into Ansys analysis software for finite element force analysis, and then the piston and connecting rod part are imported into Adams software through the seamless interface software Mechanical/Pro between Pro/E and Adams for dynamic analysis, and their motion curves in various situations are obtained, and the data basically meet the actual requirements.

In view of the unreasonable phenomenon of water consumption in the water supply planning of small towns, the field investigation of water consumption in 10~1998 was carried out on typical small town agglomerations in 2004 regions, and the statistical results showed that the daily change coefficient of domestic water in small towns should be 1.4~2.5. For residential houses with indoor water supply and drainage sanitary appliances, but no shower equipment, the recommended value of the change coefficient is 2.1~2.6; For residences with water supply and drainage sanitary appliances and shower equipment, the recommended value is 1.4~1.8; For residences equipped with water supply and drainage sanitary appliances and shower equipment and centralized hot water supply, it is recommended to take the value of 1.3~1.5.