The effect of lignin fiber on the road performance of OGFC-13 mixture was studied by adding lignin fiber to OGFC-0 mixture with 2.0%, 3.0% and 4.13% performance tests, and the optimal lignin fiber content was sought. The experimental results showed that the optimal oil-stone ratio of OGFC mixture increased more after the addition of lignin fiber, but with the further increase of lignin fiber content, the increase of optimal oil-stone ratio slowed down. Lignin fiber has obvious effects on the Marshall stability, water stability and high temperature stability of OGFC-13, which are improved by 7%, 31% and 86%, respectively. The recommended optimal dosage is 13.0%.

Three different emulsifiers AE, BE and CE were used to prepare modified emulsified bitumen by changing their dosages and SBR latex, and the emulsification effect and evaporation residue properties of the emulsion were experimentally studied. The results showed that SK-3 had good emulsification effect when the doses of AE, BE and CE reached 2.0%, 1.2% and 1.5%, respectively. The 90°C ductility index of residue showed that the effects of the three on the properties of asphalt materials were improved, maintained and reduced. The inspection of residual elastic recovery, viscosity and toughness, dynamic viscosity at 5 °C and other indicators is of great significance for the quality control of raw materials used at microsurfaces. The results show that when other indicators of the emulsion meet the requirements of the specification, the dynamic viscosity of the residue at 60°C is difficult to meet the requirements of the foreign standard "≮60 Pa·s", and it is recommended that the technical requirements such as elastic recovery, viscosity, toughness, and dynamic viscosity in China be gradually included in the relevant specifications.

In order to simulate the fracture failure of concrete simple supported beams under dynamic load, the program code for dynamic analysis of simple supported beams was compiled by using the principle of dynamic virtual work, time step, bilinear cohesion zone model, and conventional finite element cohesion zone model. With the help of the powerful pre- and post-processing functions of the commercial software ABAQUS, the size of the verification cohesion unit should be controlled within one-half of the length of the cohesion area. In the initial stage after crack cracking, the crack propagation rate is slower, and then it propagates upward at a steady speed. The example shows that the method combining conventional finite element and cohesion zone model has broad application prospects in simulating the naturally occurring fracture process of cracks.

By adding the light metal element Ti, the (Mg65.25Cu10.0Gd65.0) 25-xTix (x=0, 1.100, 0 and 2.5) bulk metal-glass composites with Mg5Cu7Gd5 metal glass as the matrix were successfully prepared by copper mold suction casting, and the material showed high specific strength. The wear resistance of the massive metal-glass composite was studied by means of disc pin friction experiment. The experimental results show that the formation of crystalline phase Ti particles on the Mg block metal glass matrix can effectively improve the wear resistance of the composite, and with the increase of Ti content, the hardness of (Mg0.65Cu0.25Gd0.1)100-xTix (x=0, 2.5, 5 and 7.5) composites gradually increases, and the wear volume loss shows a trend of first decreasing and then increasing, when the atomic number fraction containing Ti reaches 5%. The composite showed the smallest wear volume loss, which was reduced by 65% compared with the single Mg25Cu10Gd20 metal glass.Finally, the mechanism of significantly improving the wear resistance of Mg-based bulk metal glass composites was analyzed from the perspective of microhardness and compression plasticity.

The nano-Al2O3-coated Al composite powder was prepared by heterogeneous precipitation, and Al2O3/Al composites were prepared by hot pressing sintering, and the microstructure and thermodynamic properties of the composites were studied by differential thermal analyzer, SEM, Jiaxian Vickers hardness tester and universal testing machine. The results showed that the compound powder components obtained by calcination at 1 050°C/30 min were α-Al2O3 and Al. Compared with single-phase Al2O3, the addition of nano-Al reduced the sintering temperature of porcelain. The flexural strength of Al10O2/Al composite ceramics with a molar fraction of 3% Al increased by 10%, the fracture toughness increased by 86%, and the hardness value decreased with the increase of Al.

In order to meet the needs of complex system performance analysis, a fuzzy comprehensive evaluation method based on ADC performance model is proposed by combining traditional system analysis, mathematical modeling and fuzzy mathematics, and integrating the advantages of different analytical tools. Firstly, the system is decomposed hierarchically to form an efficiency evaluation index system, then the evaluation set and membership function form of performance evaluation are determined, and finally the weight is aggregated layer by layer according to the basic steps of fuzzy comprehensive evaluation to obtain the overall performance evaluation vector of the system. The analysis and simulation of the combat effectiveness of typical optoelectronic countermeasure systems show that the proposed method is feasible.

Using digital terminal control technology, based on the principle of negative feedback dynamic adjustment and adjustable polysilicon resistance strip, a novel high-precision on-chip matching resistor circuit that meets the requirements of high-speed serial interface USB2.0 protocol is designed.Using TSMC’s CMOS 0.25μm mixed-signal model and simulated with spectre simulator in the Cadence software environment, the results show that under the action of 500 MbPs high-speed clock signal, the designed matching resistance value is [44.3 Ω. In the range of 45.6 Ω], the maximum settling time is 6μs, the average error is ±1.45%, the average variation range of the designed resistor is 45×(1±1.45%)Ω, and the maximum error range is 1.56%, which meets and exceeds the high-speed serial interface protocol requirements of 45× (1±10%)Ω.

With the development of communication technology, the gate length of HEMT devices becomes shorter and shorter, and the early speed-field empirical formula can no longer accurately describe this change as the gate length continues to decrease. Through the computer simulation of the existing velocity-field empirical formula, it is found that there is a certain error between it and the measured literature data, so an improved velocity-field empirical formula is proposed. Based on the linear charge control model, a new high-electron mobility transistor (HEMT) I.-V. model is analyzed by considering the channel length modulation effect. The simulation results show that the model has high accuracy.

Aiming at the jitter problem caused by conventional sliding mode variable structure control methods in electromagnetic bearing control, a power exponential approximation law that can effectively weaken system jitter and ensure system asymptotic stability is proposed, and the approximation law is used as the sliding mode reference trajectory, and the name model of uncertain system is used as the sliding mode prediction model, and the idea of rolling optimization and feedback correction in predictive control is introduced into the design of discrete quasi-sliding mode variable structure control system. Rolling optimization solution is realized. The electromagnetic bearing dynamics model is established and simulated, and the results show that the scheme can effectively reduce the adverse effects of jitter on the system, realize the rapid adjustment and stable suspension of the rotor, and its tracking performance is fast and accurate, and it has strong robustness to the change of system parameters and resistance disturbance.

Based on the principle of singular value decomposition and incremental generalization of the least squares principle, a recursive algorithm for parameter estimation of Box-Jenkins model is proposed. The conventional generalized augmented least squares algorithm is sensitive to rounding error, which will cause the covariance matrix to lose positive characterization and symmetry, resulting in the problem of pathological conditions and numerical instability. In order to improve the performance of parameter estimation, the Box-Jenkins model estimation algorithm is derived by using the singular value decomposition technique of covariance matrix. The algorithm has high recognition accuracy, fast convergence speed and good numerical stability. The simulation shows that with the increase of the noise-signal ratio. The new algorithm still has good performance.

Combined with the swinging single-beam ultrasonic ranging method, a design scheme of underwater microterrain real-time detection system based on high-speed DSP-TMS320C6416 platform is proposed, and it is implemented from hardware and software. The cm-level precision microterrain measured by this system can calculate the optimal cutting depth of the front-end terrain, so as to realize the accurate control of the floating of the mining head in the mining process of deep-sea cobalt-rich crusts resources, and achieve the purpose of optimal cutting. The test results show that the system can detect the terrain in front of it in real time when the experimental bench is walking at a uniform speed of 50mm/s, and draw a three-dimensional topographic map after the stroke meets the set distance, and the error is small, which can meet the actual requirements of cobalt crusts mining.

Kalman filter technique is one of the theoretical foundations of target tracking. In engineering applications, nonlinear filtering methods are mostly used to track targets. The Unscented transform is introduced, and the Unscented Kalman filter (UKF) is used to simulate the target tracking, which effectively overcomes the shortcomings of the traditional extended Kalman filter algorithm (EKF). The second-order approximation of the best estimate is given, which improves the accuracy and stability of target tracking. The simulation results show that the algorithm has good effects on the position and speed tracking of the target. For target maneuvering, the multi-model filtering algorithm can be used to achieve accurate tracking of target maneuver.

According to the characteristics of TD-SCDMA system, based on the method of inner loop power control in the system, an inner loop power control algorithm based on linear prediction parameters is proposed, and the inner loop power control with different channel conditions and different control input parameters is simulated by combining open-loop and outer loop power control. The results show that the algorithm can compensate for the path loss and slow fading, which is beneficial to the improvement of system performance.

The working principle of horizontal PECVD was discussed, and the key technologies of simulation in the virtual machining process were studied. Based on the powerful engine mechanism of the Open Inventor development platform, the simulation of the virtual processing process of the continuous plasma-enhanced chemical vapor deposition (PECVD) system (In-line PECVD) system is realized by the program, so as to ensure the design success rate of the physical prototype and reduce the design and trial production time of the physical prototype.

In view of the shortcomings of vector spectrum analysis technology in the application of rotor vibration analysis, from the perspective of rotor system dynamics, the relationship between vector spectrum parameters and system dynamics parameters is derived from the perspective of rotor system dynamics, and it is theoretically proved that under the premise of constant speed, the oscillation angle and vibration-vector ratio are only related to the stiffness coefficient and damping coefficient of the system, and the research results provide a certain theoretical basis for the application of vector spectrum analysis technology for rotor system vibration analysis and system parameter identification.

With the development of new energy technologies such as liquid hydrogen, it has become an inevitable demand for the development of this discipline to investigate and study the tribological mechanism of lubricating materials, parts bodies and their coatings in ultra-low temperature environment to establish the design theory of ultra-low temperature mechanical parts. In order to meet the needs of ultra-low temperature tribology experiments, an ultra-low temperature environment tribological performance experimental system is designed by applying the design principle of pin-disc friction pair directly immersed in ultra-low temperature fluid, which consists of three parts: external drive tribology experiment host, open liquid nitrogen ultra-low temperature environment maintenance system and friction detection system. The system structure is simple, easy to operate, suitable for a variety of special working conditions tribology experiments.

The finite element method was used to analyze the temperature field of the valve plate of the micro-water energy-saving hot air valve in the steady state, and the temperature field distribution of the valve plate in the steady state working state was calculated by the finite element software ANSYS, and when the valve was fully opened, the outer ring of the valve plate had the highest temperature and the largest temperature difference, which was easy to cause the deformation of the outer ring of the valve plate; When the valve is closed, the maximum temperature at the junction of the valve plate and the refractory is about 205 °C, and the temperature of the valve plate core increases with the increase of the thermal conductivity of the refractory.

Aiming at the weaknesses of conventional PID control such as hysteresis and low accuracy in nonlinear and large inertial systems, a control system combining neural network and prediction algorithm is constructed. The pre-control algorithm is adopted, which makes full use of the rolling optimization and feedback correction characteristics of predictive control, and uses the neural network to establish the dynamic model of the system as the prediction model of the prediction controller, which realizes the adaptive control of the large lag system, which has real-time control and prediction performance, effectively improves the control accuracy and reliability, and enhances the stability. The field operation results show that the method used in the air purifier system has good effect and is easy to promote.

Taking the rigid support of the rotor installed vertically at both ends as the research object, the differential equation of unbalanced rotor bending and torsional coupling vibration is derived, the nonlinear differential equation is analyzed theoretically and qualitatively, the frequency components contained in the bending and torsional vibration response are solved, and the bending and torsional vibration characteristics of the unbalanced rotor are numerically simulated: under the external excitation of the rotor with an angular frequency of ω1, the torsional vibration with a frequency of |ω-ω1| is mainly excited through bending and torsional coupling, when the rotor has an external torque action with an angular frequency of ωt1. The main excitation generates the bending of the |ω±ωt1|frequency. The simulation results are consistent with the theoretical analysis, and the analysis results provide a theoretical basis for the fault diagnosis of vertical rotor bending torsion coupling resonance.

Under the action of temperature load and high temperature and high humidity load, the force analysis of the TAB specimen bonded by anisotropic conductive adhesive was carried out, and the relationship between bonding interface stress and strain under temperature and high temperature and high humidity load was established through the force analysis of the thin film beam element by beam theory, and the singular differential equation with function was used to solve it, and the interface normal stress and shear stress distribution results obtained by finite element numerical simulation were compared, and the calculation results were similar to the numerical simulation results, which verified the correctness of the calculation .

The hydrolysis of hexamethyldisilazane at different pH values and different temperatures was investigated by gas chromatography. The results showed that the hydrolysis of hexamethyldisilinene could be described as a first-order reaction, and the hydrolysis rate decreased with the increase of pH value in the range of pH=7~pH=13. In the range of 208~308K, temperature had a significant effect on the hydrolysis rate, and the hydrolysis activation energy was 7.28 kJ·mol-81 when pH=1.

In order to reduce the color of nitro wastewater, the feasibility of three methods to reduce the color of nitro wastewater was studied by three methods: corn cob adsorption, ultrasonic - H2O2 and ultrasonic - Fenton reagent - flocculant. The experimental results show that the treatment effect of corn cob adsorption method and ultrasonic-H3O2 method is not satisfactory. The color of wastewater before and after treatment almost unchanged, while the decolorization of ultrasonic-Fenton reagent-flocculant method showed obvious changes in the color of wastewater before and after treatment. The correlation between ultrasonic time, ultrasonic power, H2O16 addition, FeSO45 addition and pH value of wastewater liquid on wastewater color was experimentally studied by applying orthogonal design L2(2). Considering the economic factors, the experimental conditions were optimized: the addition amount of H4O2 was 2 mL/L, the addition amount of FeSO3 was 4 mg/L, the pH of the wastewater liquid was = 100, the chromaticity (dilution factor method) was 4, and the decolorization rate was more than 5%.

Anaerobic baffle reactor (ABR) is a new type of high-efficiency wastewater treatment equipment with great application prospects, and hydraulic characteristics are important factors affecting its treatment efficiency. The flow state of the ABR reactor was characterized by NaCl as tracer, and the RTD curve and hydraulic characteristic parameters of the ABR reactor under several HRT were tested, and the influence of HRT on the number of hydraulic dead band volumetric integrals and cascade models was analyzed. The results show that when the HRT of the ABR reactor changes at 1~9 h, the number of dead band passenger integration is less than 0.30, and it is between 0.068~0.299.

Under the conditions of nitrogen removal, the operation mode of denitrification SBR was selected, and corresponding enhanced nitrogen removal measures were taken to study the effect of biological denitrification of SBR in monosodium glutamate wastewater. The results show that restrictive aeration is adopted in the water influent stage. The operating conditions were 8 h of influent aeration, 1 h of anaerobic stirring, 1 h of aeration in the back section, 1 h of precipitation and 0.5 h of drainage. The pH value of the nitrification reaction process should be controlled at about 8; The concentration of dissolved oxygen in the nitrification stage and denitrification stage should be controlled at about 2.0 mg/L and 0.5 mg/L, respectively. NH3-N sludge load should be controlled at 0.01~0.02 kg/(kg MLSS·d).When the NH3-N concentration of influent is 18.2~269.1 mg/L, the effluent concentration is 8.0~38.4 mg/L, the removal rate range of NH3-N is 51.1%~87.7%, and the effluent NH3-N index can meet the limit value of 19431 mg/L in GB2004-50< monosodium glutamate industrial pollutant emission standard >.

Aiming at the static stability and ultimate bearing capacity of fasting grid shell structure, the nonlinear finite element method was used to study. The whole process of buckling mode and instability of fasting grid shell structure was investigated by two analysis methods, eigenvalue buckling analysis and nonlinear buckling analysis, and through large-scale geometric parameter analysis, the structural limit bearing force of sagittal span ratio, grid shell thickness, web section and other parameters was calculated when different values were obtained, and compared with the single-layer grid shell structure. The results show that the fasting grid shell structure is mainly instability as a whole, and the ultimate bearing capacity is 2.87 times higher than that of the single-layer grid shell structure under the same amount of steel.

The extraction test of 36 hot-rolled ribbed steel bars and concrete bonding specimens using the anchoring form of enlarged sleeve was carried out, and the main parameters were concrete strength, steel bar diameter, anchoring length, protective layer thickness, transverse reinforcement ratio and enlarged sleeve size. The bonding anchorage strength, failure form and main factors affecting the bonding and anchoring performance of ribbed steel bars and concrete using this mechanical anchoring method are systematically analyzed. The experimental results show that this anchoring method can significantly improve the ultimate bonding anchoring strength of ribbed steel bar and concrete, reduce the amount of bonding slip, and effectively reduce the anchorage length. Finally, on the basis of statistical regression, the calculation formula of the bonding strength of the steel bar with enlarged sleeve is given, which provides a reference for the inclusion of mechanical anchoring method in the further revision of the design code of concrete structure in China.

The axial bearing capacity test of the steel-high-performance concrete composite tower section was carried out to study the stress characteristics of the composite tower. Referring to the relevant codes and regulations, the bearing capacity of the combined bridge tower was calculated. The test and calculation results show that the presence of concrete in the composite bridge tower can avoid or delay the local instability of the tower wall, improve the bearing capacity of the structure, and have great advantages over the steel bridge tower. The bearing capacity obtained by the direct superposition method is 7.3% larger than the test value, and the bearing capacity obtained by the method in DBJ13-51-2003 is 25.3% larger than the test value, the former is easy to calculate, the latter can consider the interaction between the wall plate and the concrete, but neither method can be included in the influence of local buckling of the wall plate; The weld and base metal of the composite bridge tower should be equally strong, otherwise it will cause the destruction of the entire structure due to the failure of the weld.

Based on the analysis of ballastless track with floating plate structure, according to the characteristics of prefabricated floating plate structure, a mechanical model of continuous integral floating plate structure, namely the Bernoulli-Euler beam model with elastic support, is established. Through the analysis of the influence of different longitudinal arrangements of the continuous floating plate structure on the vibration response of the rail girder system, it is concluded that when the length of the continuous floating plate is twice the span of the box girder, the displacement, acceleration, and dynamic disturbance and acceleration values of the box girder are relatively small. In the initial design of the floating plate ballastless track, it is suggested that the length of the continuous floating plate can be twice the span of the box girder.

The processing method of moving load is obtained from the differential equation of forced vibration of the beam, and the dynamic response of the railway tunnel under high-speed moving load is analyzed on the basis of the excavation static field, considering the temporal and spatial effects of the load. The results show that the maximum dynamic response of the structure occurs at a certain moment after the wheelset passes the measurement point, and slightly lags behind the passing point of the time. The vertical displacement, acceleration and dynamic stress of the structure increase with the increase of driving speed, among which the upward arch stress is the most sensitive to driving speed. The high stress area is mainly concentrated in the inverted arch and side wall, which are the weak points of the tunnel dynamic design. Under the load of train, the structural failure is mainly controlled by the tensile strength.

A theoretical method for the analysis of forced vibration shear hysteresis of thin-walled box girder is proposed. The differential equation and boundary conditions of forced vibration of box girder considering the shear hysteresis effect are derived by variational principle, the differential format of the equation solution is established, the stability and convergence of the differential format are demonstrated, and the Matlab programming is used. In the numerical solution, due to the coupling between the vertical displacement of the beam and the longitudinal maximum displacement difference function of the wing plate reflecting the shear hysteresis, the necessary hypothetical shape function in the finite element method cannot reflect the coupling relationship, so the finite difference method with stronger adaptability is adopted. The results show that the shear hysteresis effect is obvious when the thin-walled box girder vibrates, which significantly increases the amplitude of the mid-span displacement response and the stress response at the junction of the upper wing plate and the web.

Based on the principle that the supporting stiffness of the foundation corresponds to the distribution characteristics of the upper load, and considering the distribution of stress field and strain field in the foundation, the spatial stiffness design method of the foundation is numerically analyzed. The three-dimensional finite element model of composite foundation is established, and the spatial change of supporting stiffness of foundation is reflected by the change of deformation modulus of foundation, and the distribution law of foundation settlement contour when discussing the spatial change of foundation support stiffness verifies that the spatial stiffness of foundation has a significant effect on reducing the settlement difference of foundation, improving the force mode of building structure, reducing the internal force and thickness of raft and reducing the secondary stress of the superstructure.

Plank roads in tourist attractions are usually made of local materials, the design and construction technical information are unknown, and crowding often occurs, which has potential safety hazards. The technical route of safety evaluation of plank road is proposed, including four items: the rock mass attached to the plank road, the node of the plank road and the rock mass, the stack structure itself and the auxiliary structure of the plank road. According to the different connection methods of nodes, the mechanical analysis models of cantilever, column and oblique column planks are established. According to the actual plank road investigation, the bending moment, axial force and shear force of the eight models under the corresponding load were compared and analyzed, and it was found that the maximum bending moment and shear force appeared on the horizontal beam and the maximum axial force appeared on the oblique support, and then the most unfavorable internal force verification mode of the plank road was proposed. Combined with the case project, the safety evaluation of the plank road engineering example is carried out, and the applicability of the analysis model is verified.

Scientific prediction of regional highway traffic is the premise and basis of regional highway network planning. After analyzing the changes of highway traffic in China since 1980, it is pointed out that in the future, cars should be used as the standard for measuring highway traffic, on this basis, the four-stage predictive analysis theory is used to research and establish a highway traffic forecasting model and method suitable for the characteristics of Henan Province, and the demand generation, traffic distribution, transportation mode selection and traffic distribution of highway traffic in Henan Province are predicted and analyzed. The actual data of the traffic volume of Luohe-Zhumadian Expressway in 2007 are verified, and the results show that the prediction model established by using the four-stage analysis and prediction theory can better predict the highway traffic volume in Henan Province.

According to the Radial Basis (RBF) neural network and autoregressive sum sliding average (ARIMA) based on nearest neighbor clustering algorithm (NNCA), their respective single-term prediction submodels are established, and the RBF neural network is used to combine the results of the two single-term prediction submodels to obtain the final prediction value. The experimental results prove the effectiveness of the model by applying the model to the traffic flow prediction of a certain road section in Changsha, and the prediction accuracy of the combined prediction model is greatly improved compared with the single prediction model.

Through the ecological environmental impact assessment of the highway network planning in Henan Province, the ecological service value loss caused by the transformation of natural and semi-natural ecosystems such as forests, grasslands, farmlands and rivers into artificial systems such as transportation facilities during the implementation of the expressway network was analyzed, and the estimation method of ecological service value loss caused by highway construction was proposed, and the results could be used as the basis for ecological compensation.