Abstract:

Abstract: Taking a high-rise frame-eccentric support steel structure house as the engineering background, the finite element software SAP2000 was used to model the structural stiffness, internal force distribution, vibration mode and load-displacement curve under rare earthquakes, and a number of seismic waves were used to compare the elastic time history and elastoplastic time history of the central support and eccentric support structural systems, and the dynamic characteristics and seismic performance of the two structural systems were compared. The analysis shows that the anti-lateral stiffness of the high-rise frame-eccentric support steel structure system can meet the requirements of structural anti-lateral shift. Under the action of repeated earthquakes, the eccentric support structure system has obvious energy dissipation, and the structural dynamic response is less than that of the central support system. Under the action of rare earthquakes, the stiffness attenuation of the eccentric support structure is small after entering the plastic stage, and the lateral stiffness and bearing capacity can still be maintained, which shows the ductility characteristics of which are significantly better than the central support system, and the seismic performance is better than that of the central support system.

Abstract: In order to study the plastic hinge length of in vitro prestressed combined millet under the action of negative bending moment, the influence of cross-section support conditions, cross-height ratio and geometric properties on plastic hinge length and other parameters was analyzed by using the cantilever beam model. The analysis results show that the mechanical properties of the composite beam under the action of negative bending moment are controlled by stability, and the length of the unilateral plastic hinge of the support is about 0.5 times the height of the web of the copper beam, which does not change significantly with the change of cross-section geometry and loading mode.

Abstract: According to the plastic theory of steel fiber concrete, the yield conditions of rebar, concrete and steel fiber concrete were determined, and the oblique section failure mechanism of steel fiber reinforced concrete beam with two displacement parameters was established, and the upper limit theory of plastic analysis was applied to derive the function expression of shear failure load of oblique section by energy method, and the limit load was obtained by optimizing and solving it. By adjusting the layer thickness of steel fiber concrete, the calculation formula is applied to the ultimate load calculation of the oblique section shear failure of ordinary reinforced concrete beams, reinforced steel fiber reinforced partial concrete beams and reinforced steel fiber reinforced full-section concrete beams. The example calculation shows that the calculation results are in good agreement with the experimental results, which proves that the calculation theory and method are correct.

Abstract: The concrete frame model was designed according to the 1:3 scale scale-down model, and the quasi-static test was carried out, and the force performance, crack development, failure form, hysteresis curve, skeleton curve and displacement ductility of the concrete frame structure and the frame structure reinforced by carbon fiber cloth after the failure were analyzed and compared, and the seismic performance of the concrete frame structure that had been severely damaged by carbon fiber reinforcement was studied. The test results show that after the carbon fiber is seriously damaged after the earthquake, its ultimate bearing capacity, energy dissipation capacity and ductility and other seismic properties are significantly improved.

Abstract: Through the comparative test of shear performance of six reinforced concrete beams reinforced by riveted U-shaped steel plates and two unreinforced control beams, and compared with the control beams, the force characteristics, bearing capacity, crack development, stiffness change and reinforcement effect of the diagonal section of the reinforced steel plate reinforced beams were analyzed, and the calculation method of the shear bearing capacity of reinforced concrete beams reinforced with riveted steel plates was proposed. The experimental results show that the formula has good applicability.

Abstract: The spatial finite element calculation model of the 120 m span reclining arch bridge of the main bridge of Chengdonghe Zhanhe Bridge in Pingdingshan City was established by using Midas/civil finite element software, and the static characteristics of the bridge under constant load and constant load + live load were calculated. The calculation results show that the concrete components of the whole bridge are generally in a compression state, the maximum positive stress value of the rod beam is 6.28 MPa, and the maximum positive stress value of the arch rib is 12.0 MPa, both of which are less than the C50 concrete design compressive strength: the safety factor of the main arch boom is 2.94, the safety factor of the stable arch boom is 2.70, and the minimum safety factor that meets the design requirements of the arch bridge shall not be less than 2.5: the maximum vertical displacement of the tie beam is 0.039 m, and the maximum vertical displacement of the arch rib is 0.03 m. The maximum lateral displacement is 0.101 m, which meets the deformation requirements under the normal service limit state of the bridge design code.

Abstract: Aiming at the parametric vibration problem of cable-stayed cables, combined with engineering examples, four different calculation formulas were used to calculate the fundamental frequency of cables, and through analysis and comparison, it is recommended to use the commonly used fundamental frequency calculation formula considering sag to analyze the parameter resonance of cables. The analysis results show that parametric resonance may occur in the medium and long cable-stayed cables of Huangpu Bridge. The viscous shear type external damper can provide sufficient additional damping for the cable, so that the logarithmic attenuation rate of each controlled mode shape of the cable reaches more than 4.0.

Abstract: According to the structural feature of the bridge，spatial finite element analysis model is established to calculate its natural vibrations，by use of the seismic time—history response，dynamic characteristics and the seismic responses derived from history analysis are analyzed and compared whether under initial stress or not．The results show that the response of initial stress do not have too much effect on the bridge．The anti—seismic capability of the bridge is good．

Abstract: The non-Darcy seepage equation considering the initial hydraulic gradient is used to generalize the one-dimensional consolidation theory of Terzaghi saturated clay to the condition that the ground load can be considered with time, and the numerical calculation format of the finite volume method is given. On this basis, the effects of the initial hydraulic gradient and construction speed on the consolidation characteristics of saturated clay layer are discussed. The calculation results show that the larger the initial hydraulic gradient, the slower the consolidation speed of the foundation, and the final consolidation degree is less than 1. The influence of construction speed is mainly reflected in the construction period and the early stage of completion.

Abstract: The terrain and geomorphology of mountainous areas are changeable, the foundation conditions are complex, and the uneven deformation and instability failure of the high-fill embankment occur from time to time. According to the basic characteristics of high embankments in mountainous areas, the engineering characteristics of high-fill embankments on flat foundations and the elastoplastic consolidation problems of high-fill embankments in mountainous areas under different fill heights, weak foundation thickness, filling rate and compaction were analyzed by finite element method, and the law of deformation and failure of mountainous high embankments was obtained. This law can be used to comprehensively understand the deformation and failure form of high embankments in mountainous areas, and effectively guide the actual construction.

Abstract: Based on the seepage characteristics of porous media and the nonlinear constitutive relationship of soil, the coupling effect of seepage field and stress field was studied. According to elasticity and seepage theory, the fluid-structure interaction mathematical model and finite element format were established. The large-scale finite element analysis software ABAQUS was used to establish a nonlinear coupling model of the earth-rock dam of Yanshan Reservoir, and the fluid-structure interaction analysis was analyzed, and the calculation results showed that the interaction between seepage and stress in the dam body could not be ignored, and considering the coupling commission would adversely affect the stability of the earth-rock dam.

Abstract: A block-based pavement damage detection algorithm in wavelet domain is proposed. After preprocessing such as denoising and enhancement, the initial area of pavement damage is obtained by adaptive threshold segmentation of the approximate component in the highest layer by hearing wavelet transform. In the other layers, from the high floor to the low floor, only the pavement damage area is further divided and processed in pieces, and the pavement damage is accurately detected. Simulation experiments show that the proposed algorithm can overcome the influence of noise well, and has a good pavement damage segmentation effect for different types of pavement damage.

Abstract: The rotary kiln is one of the key equipment of the cement production system, and its service status directly affects the output and quality of cement. Aiming at the problem of cracking of the cylinder weld of a cement rotary kiln along the cylinder axis, the mechanical analysis of the wheel belt and the cylinder shows that the stress causing the cracking of the cylinder weld at the cushion plate mainly includes bending stress, temperature stress, residual stress, etc. Combined with fracture mechanics and elastoplastic mechanics, the mechanical model of cylinder weld crack was constructed, the fracture criterion of cylinder weld was established according to the stress strength factor, and the safety assessment of the crack was carried out, and the accuracy of the model and assessment was confirmed by on-site crack statistics, and the critical size of the crack was 141 mm.

Abstract: A CDM emission reduction monitoring system for real-time detection of enterprise CO2 emissions is designed, which consists of two parts: on-site data collection and remote data upload: the on-site data collection part realizes the collection of on-site medium data and the calculation of standard carbon CER, and the remote data upload part uploads the standard carbon amount data to the provincial server monitoring system and DOE server monitoring system to complete the monitoring of CDM emission reduction.

Abstract: Based on the problems existing in the development of longitudinal torsion ultrasonic motor and traveling wave ultrasonic motor, the author analyzes and compares the two motors in detail from three aspects: the driving mechanism of ultrasonic motor, the energy conversion of piezoelectric ceramic inverse piezoelectric effect, and the contact form between stator and rotor, and points out that longitudinal torsion ultrasonic motor has more potential advantages than traveling wave ultrasonic motor to improve the performance of ultrasonic motor. At the same time, it points out several unfavorable factors that hinder the development of longitudinal torsional ultrasonic motors. Finally, from the perspective of development, the development prospect of longitudinal torsion ultrasonic motor is very good.

Abstract: Because the value of Ra is affected by a lot of factors and some of them are undefined。the Surface roughness forecasting of spiral bevel gears is a typical fuzzy，non～linear system．In this paper，based on the priority principle of BP artificial neural network，surface roughness forecasting is set up．This model BP can accurately describe the effect of wheel’S feed velocity and deep tooth feed on surface roughness of spiral bevel gears．The experiment data proves that the model BP used in forecasting the surface roughness of spiral bevel gears can get a more precise result．

Abstract: A sound card-based audio signal data acquisition system is designed and implemented on LabWindows/CVI platform. Using Windows API audio functions to collect and process the audio signals of the input sound card, using double buffer storage to collect and process the collected data, the server-side and client-side programs are realized based on the C/S structure. Listen for and respond to client access requests.

Abstract: According to the structural characteristics of a cutterhead of an EPB shield, a three-dimensional solid model was established in Solidworks, and the corresponding finite element calculation model of the cutterhead was established by ANSYS software, and the stress and strain distribution law of the cutterhead under normal working conditions and escape conditions was analyzed, and the stress-strain distribution law of the cutterhead under each working condition was obtained. The analysis results show that the dangerous section is located between the auxiliary beam and the auxiliary bar at 180~210°, and there is also a large stress at the connection between the corbel, the flange plate and the auxiliary beam, the maximum stress is 204 MPa, and the maximum deformation is 1.568 mm, and the research results provide basic data for the structural design and engineering construction maintenance of the cutterhead.

Abstract: Using the three-dimensional design software pro/e, a brake disc model that conforms to the actual size of a 300 km/h high-speed EMU is established, and the model is imported into the ANSYS software platform through the interface between pro/e and ANSYS, and the thermal-structure coupling calculation model of the brake disc of a high-speed EMU under emergency braking conditions is established. The distribution of the temperature field and stress field of the brake disc was obtained by applying the powerful nonlinear multiphysics processing function of ANSYS software to fully consider the influence of the material parameters of the brake disc with the change of temperature and temperature and the influence of heat flow coupling between the brake disc and the brake pad. The brake disc reaches a maximum temperature of 66 °C at t=815 s and a maximum stress of 90 MPa at t=760 s.

Abstract: The SIMULINK tool in the MATLAB platform was used to simulate the kinematics of the double crank slider mechanism. Taking the mechanism as a system, constructing the simulation model through its kinematic equations, and setting the relevant parameters in the model with the initial position of the mechanism, the simulation analysis results of the motion parameters of the mechanism are obtained. Finally, the main drive mechanism of a platform printing machine is used as an example to verify the correctness and effectiveness of the method.

Abstract: In order to analyze the temperature-load coupling stress of asphalt pavement under different pavement structure and material parameters, the effects of asphalt surface thickness and modulus, poor concrete base layer thickness and modulus and base joint width on the temperature-load coupling stress of asphalt pavement were analyzed by three-dimensional finite element numerical method. The results show that the thickness of asphalt surface layer and the width of base layer shrinkage have significant effects on the temperature-load coupling stress of pavement. The effect of coupling stress on the thickness and modulus of the base layer was not significant. Appropriately increasing the thickness of asphalt surface layer is very effective in preventing reflective cracks. Changing the thickness and modulus of the poor concrete base layer has little effect on preventing reflection cracks. Appropriate width of base layer shrinkage has a significant effect on delaying reflective cracks.

Abstract: Overloading is a common phenomenon in highway transportation．It has great effect on the early wa—ter—damage of asphalt pavement．This paper simulates the overloading and water immersing condition of as—phah mixture by using untraditional rutting test(water immersing rutting test)，and analyzes the rutting deformation and dynamic stability of asphalt mixture under this condition．So the influence of overloading on thewater stability of asphalt mixture can be further studied．

Abstract: In order to effectively suppress the interlayer failure of the old asphalt pavement plus pavement structure, a finite element model is established, and the influence law of the internal forces between the old asphalt pavement and the paving structure is determined by analyzing the horizontal load, the thickness and modulus of the additional layer, the equivalent rebound modulus of the old road, and the lateral cracking of the old road on the internal forces of the old asphalt pavement and the paving structure, and then determine the range of interlayer shear stress of the old asphalt pavement and the paving structure corresponding to different horizontal friction coefficients, and the interlayer compressive stress range of different pavement thicknesses. The research conclusion has reference value for the design of asphalt pavement plus paving structure and the technical index requirements of interlayer materials.

Abstract: Based on thermomechanics principle and damage mechanics theory，the stress of material crushingprocess is analyzed，and the stress equation of material crushing process is obtained．The stress equation issensible according to the experimental results of marble cyclic loading，and the criterion of material crushing isprovided by critical value of the stress equation．

Abstract: In this paper，a three—dimensional numerical model is presented to simulate the characteristics offluid flow and heat transfer in shellside of shell··and··tube heat exchanger by using CFD code FLUENT soft--ware，in which the baffle-shell leakage and the baffle-tube leakage are considered．compared with the experi·ment。it can be found that the simulated results agree with the experimental results well，the maximum relativeerror of the pressure drop is only 10．4％．and the model reliability is validated．The modeling method and nu·merical results are helpful for evaluating the performance of present shell-and—tube heat exchanger．

Abstract: Uniform design is used to obtain the optimal technic of the synthesis of dibutyl adipate，with thephosphotungstic acid as catalyst，and toluene as azeotropic solvent，with the raw material of adipic acid and nbutan01．Various factors such as molecular ratio of n—Butanol to adipic acid。amount of catalyst，reaction time，amount of azeotropic solvent which would influence the reaction were investigated．The results indicate that99．45％yield could be obtained with the following optimal reaction conditions：the molecular ratio of n—buta—nol to adipic acid 3．3：1，the amount of catalyst 1．5％by mass of adipic acid，the amount of azeotropic agent24％by total mass and the reaction time 2 hs．The experiment also researched the kinetics reaction of the catalysis esterification．The experimental results indicated that the synthesis of dibutyl adipate is a second orderirreversibale reaction，the apparent activation energy：E口=97．55 kJ·mol一1，the frequency factor was：詹o=1．75×10¨L·min～·mol～．and the kinetic equation was also tested by experiment．

Abstract: In the competition experiment，the non—covalent complexes was studied by electrospray ionizationmass spectrometry between the same protein lysozyme and two different kinds of chrysin phosphorylated derivatives，such as Ca and Ce，Cb and Ce，Cc and Ce，Cd and Ce．It was found that，in spite of all of compoundscontaining phosphoryl group，there were differences among them．The interaction lysozyme and chrysin一7一phosphated amino acid esters(a，b，c，d)was stronger than that of chrysin一7一diisopropyl phosphate(e)．

Abstract: The inverse mieroemulsion copolymerization of acrylamide and sodium styrene sulphonate was investigated，when cyelohexane oil phase，acrylamide(AM)and sodium styrene sulphonate(SSS)monomers，nonionic surfactants Span80 and Tween80 emulsifier，NaHS03 and(NH4)2S2 08 redox initiator were used．Effects of hydrophilie—lipophilie balance(HLB)value，mass fraction of oil／water，temperature，the dosageof emulsifier concentration of monomer aqueous solution，the proportion of AM／SSS on the stability of inversemicroemulsion are studied．The best polymerization condition was obtained．Under the optimized conditions，the molecular weight of polymer is 4×1 06 and FTIR proved the existence of amide carbonyl．benzene and sul—fonic group in the polymer．

Abstract: In order to ensure stable operation and effluent quality of oxidation ditch in municipal sewageplants，it is crucial to simulate its flow pattern．Velocity distribution in the bend channel of oxidation ditch wasinvestigated by establishing two—dimensional mathematical model of current under certain depth．The flow pat—tern in the oxidation ditch was simulated by using FLUENT software．The results showed that the flow patternin the oxidation ditch is greatly influenced by the shape and position of the training wall which set at the curvechannel．The optimal structure and suitable setting way of training wall was put forward by analyzing the calcu·lated results，which can improve the velocity distribution，reduce or avoid the sludge depositing at the bottomof the oxidation，and can reduce energy consumption．The simulation results have very important effect onguiding the engineering design．

Abstract: The envelope film was treated as controlled release film one and the imaginary film at the interfaceof the fertilizer and the water of the soil was treated as controlled release film two．The model of inter masstransfer of nutrition was constructed in spherical C00rdinates based on Fick’S law．combined with improveddouble films theorem of mass transfer and liquid film lire function．The equations system was solved with Laplace transform method and the expression of nutrition release rate was obtained with the unification of Laplacetransform and liquid film life distribution function without the employment of the inverse Laplace transform．The theoretical basis was provided for further research of nutrition release of controlled release fertilizers，meanwhile a method of computing mass transfer rate in spherical coordinates was given．

Abstract: The influence of Tungsten on microstructure and properties of Cr20 high chromium cast iron wasstudied in this paper．The results indicate that the distribution of Tungsten is uniform in carbide and matrix．The carbide formation of Tungsten contains WCI一。，W6C2．54 and CW3．The as—cast microstructure consists ofmartensite。austenite and carbide．Hardness and Impact toughness of the sample containing 1％W are 56～59HRC and 10—12 J／em2，respectively．The wear resistant is 2 times as good as that of the sample with noTungsten addition．When Tungsten content reaches 3％，the impact toughness decreases obviously，but itswear resistant is 2．3 times as good as that of the sample with no Tungsten addition．For the sample containing1％W．hardness and impact toughness reach 60—6 1 HRC and 8—9 J／cm。respectively and the microstructureconsists of martensite，carbide and small quantity residual austenite，under the condition of quenching at1 050℃and tempering at 250℃．The wear resistance is 3．00 times as good as that of the sample with noTungsten addition．

Abstract: A hybrid evaluation algorithm is proposed in this paper by combining BP neural network with genetic algorithms，in order to evaluate groundwater quality accurately and efficiently．In view of the multi—varia·ble and nonlinear characteristics of water assessment，BP neural network is introduced here to make compre—hensive evaluation and calculation．As for the shortcoming that BP algorithm is easily trapped to a local optimum，it can be overcomed through the introduction of genetic algorithms，and the two will work organically together to achieve the training and knowledge base establishment of the neural network．Through the compari—son of the algorithms and analysis of the results of the examples，the result shows this algorithm is valid．

Abstract: EM algorithm is inappropriate for spatial clustering which requires consideration of spatial information．Although neighborhood EM algorithm incorporates aspatial penalty term．it needs more iterations in everyE—step．To incorporate spatial information and avoid too much additional computation，this paper proposedmixed increasing NEM algorithm that combines EM and NEM．In MNEM．algorithm first train data based on ran．dora sub—sampling in EM till the likelihood—judgement condition begins to decrease，and update sub—sam．piing．Then training is turned to NEM and runs iteration of algorithm once．Because of this cross train of cycle，MNEM algorithm’computational complexity is decreased and capability is advanced．Experimental result8 8howthat less passes are needed in MNEM to converge and the final clustering quali竹is better than standard NEM．

Abstract: In view of the characteristics of multi—targets and multi—layers in evaluating route plans，themulti—-levels grey system is applied to the evaluation system to select the most superior scheme from the cornparable plans．According to the lamination of indices of route plan and determination of reference data，theanalytic hierarchy process combined with grey system theory to decide and test the relative fight weight of everyindex in the evaluating system．The synthetically grey related degree of every plan is calculated with grey related analysis method．The biggest one is the best plan．A project example shows that this method is easy andfeasible．

Abstract: Richardson iterative method for solving system of linear equations with the positive definite coeffi—cient matrix is considered，and a new constant step length rule only depending on the minimal diagonal elementand the maximum eigenvalue is proposed．Furthermore，the linear convergence of the generated gradient normsto zero is proved．Preliminary numerical tests show that the new rule is competitive for certain problems．

Abstract: Aiming at the situation that the voice was vitiated by positive noise and the difference of pollutionextent between different parts of the voice，preserving the polluted parts of voice will bring in negative affectionto the confirmation system of speaker．This paper gives a method that based on normalized autocorrelation ro。bustness selection．Normalized autocorrelation not only shows the correlation of short—time voice frame，butalso shows the polluted extent of voice．As a result，we can wipe off the deeply polluted voice through the nor‘malized autocorrelation．Experiments showing，through the normalized autocorrelation wiping off the pollutedvoice，can improve confirmation ability of speaker in high noise environment．