最新刊期
卷 47 ， 期 6 ， 2015
- 摘要：Abstract: Superior collapse-prevention performance of the building structure can maintain its abundant integrity to realize the design target of collapse prevention at MCE(maximum considered earthquake) level. To investigate the seismic mechanism of innovative PEC column—steel beam composite frame with end-plate and pretension penetrating bolts connection, a 1/2 scale test specimen of inter-story substructure was designed and tested under lateral low-cycle reserved loading. Based on the test observation and measurements, the seismic performance including the failure process and failure mode, the hysteretic property, lateral stiffness degradation, energy dissipation capacity and drift deformation pattern were analyzed. Test results showed that the failure mode was primary induced by the plastic hinge of beam section adjacent to end plate; the displacement ductility coefficient and maximum equivalent viscous damping ratio of the specimen are 3.74 and 0.325 respectively, and the specimen own better seismic ductility and energy-dissipation capacity; the drift pattern as ideal inverted triangle pattern of flexure-shear type was formed due to its excellent integrity and lateral stiffness is evenly distributed along its height; the interstory drift ratio and connection rotations all surpassed the drift limit(1/30) of maximum consideration earthquake, correspondingly the specimen owned sound collapse prevention capacity关键词：Innovative PEC column;extending end plate connection;interstory substructure of composite frame structure;lateral low-cycle reserved loading test;seismic mechanism
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发布时间：2023-11-14 - 摘要：Abstract:Abstract：The loading behaviors of the metal supporting structure with corrugated webs are greatly improved by the corrugation in the webs compared with that of the members with plain webs. The U-shaped supporting structure with corrugated webs is studied. The function relation between the structural section parameters such as the height and thickness of the webs, the width and height of the flanges, and the first-order elastic overall buckling load of the supporting structure under hydrostatic pressure is established by using orthogonal design method. Furthermore, the relationship between the section radius of the U-shaped supporting structure and the overall buckling load are also studied. Based on these, the formula of first-order elastic overall buckling load of the supporting structure is derived herein.关键词：corrugated web;U-shaped;supporting structure;hydrostatic pressure;buckling
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发布时间：2023-11-14 - 摘要：Abstract:Reservoirs play a pivotal role in trapping sediments and reducing sediment load into the downstream reach. The construction of reservoirs in the upper Yangtze River had reached its peak since 2003 when the Three Gorges Reservoir was putted into operation. This could greatly change the sediment condition of the Three Gorges Reservoir. To study this effect, this study presented the impact of 66 reservoirs (in operation, under construction, or being planned) in the upper Yangtze River on sediment trapping, based on which sediment load into the Three Gorges Reservoir was predicted. The analysis used the measured 1991-2000 hydrologic series as input, and the calculation of trap efficiency was based on the method proposed by Brune. The results indicate that, due to sediment trapping by the reservoirs, sediment load into the Three Gorges Reservoir drastically reduces to 60 million tons per year, accounting for only 15% of the average yearly sediment load during 1991-2005.关键词：cascade reservoirs;trap efficiency;sediment load;Three Gorges Reservoir
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发布时间：2023-11-14 - 摘要：Abstract:The evolution of piping is a complex process, which is influenced by many factors. In order to investigate the influence of flow condition and soil particle composition on the piping process, a list of experiments on two typical types of non-uniform flow and three kinds of soil particle composition was carried out using the self-designed apparatus. The results indicated that divergent flow reduced the discharge in the outlet, meanwhile the critical hydraulic gradient for piping was large and the erosion rate was slow. The hydraulic gradient in the soil sample gradually decreased along the divergent flow direction before the erosion. On the other hand, the convergent flow made the discharge in the outlet large, the critical hydraulic gradient small, and the erosion rate fast. The hydraulic gradient in the soil sample gradually increased along the convergent flow direction before the erosion. Furthermore, the coarser the fine particles, the larger is the critical hydraulic gradient and the slower is the developing speed of the piping channel.关键词：piping;flume model test;non-uniform flow;grain composition;hydraulic head distribution;erosion rate
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发布时间：2023-11-14 - 摘要：Abstract:As one of the most common mountain hazards, the collapse of dangerous rock at high altitude with freezing temperature in Sichuan-Tibet Mountains presents a serious threat to the driver traffic safety and people survival. However，there are less effective measures that can be used to diagnosis and treat these frigid danger rocks just for its mechanism is not clear at present. Thus from the true structure of danger rock and based on the rock fracture mechanics，the expression to calculate the expansive force of crack ice is developed. Then by analyzing the condition and process of crack propagation，the instability mechanism of dangerous rock under ice expansive force is studied clearly. Furthermore，the calculation formula for critical temperature rise and propagation length are also suggested. At last，an example is given to prove the theory. The result shows the cracks on danger rock can propagate and develop when the temperature rises higher than the critical value, which result in the collapse occasion at last.关键词：extreme cold dangerous rock;ice expansive force;propagation of cracks;critical rise temperature;Griffith theory
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发布时间：2023-11-14 - 摘要：Abstract:The transversely isotropic property of rock and soil layers can be shown in their deformation and strength properties because of the action of gravity. A numerical method and its corresponding Fortran codes were developed for assessing the additional stress and displacement fields in transversely isotropic foundation. The proposed method is based on the fundamental solutions for two joined transversely isotropic solids and integrates it over the distributed load by the use of a two-dimensional numerical integration after discretizing the loading area into a limited number of 8-noded isoparametric elements. The proposed method can be used for the analysis of half-space foundations with arbitrary loading areas and uniformly distributed loads, and very high computational accuracy can be obtained. Then with the use of the computer program, the influence of anisotropy was analyzed on the additional stress below the rectangular base due to a normal or tangential load case. Results show that the anisotropy of Poisson’s ratio has almost no effect on the additional stress. The anisotropy of elastic modulus exerts an obvious influence only under a normal load case. Except for the additional stress parallel to the isotropy below the corner point, the anisotropy of shear modulus all has an obvious influence.关键词：anisotropy;transversely isotropic foundation;additional stress field;numerical analysis method
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发布时间：2023-11-14 - 摘要：Abstract:The slurry rheological properties of debris flow and its impact factors are major content of debris flow dynamics research. To study typical fine clay Rhelogical Properties of Prone Area of debris flow, this research selected typical soil of Xiao River basin in Yunnan province and the Bailong River in Gansu province. With rheological experiment， particle size experiment and mineral composition analysis method, it compared and studied the debris flow slurry rheological properties and its impact factors on red soil of Xiao River and yellow soil of Malan, Bailong River. It was found that along with the increase of density, shearing stress, yield stress and stiffness index of both red and yellow soil indicated a trend of growth, with more obvious growth range under high density. Besides, under the condition of same density, the three indicators of red soil were significantly higher than that of the yellow soil. Also, the shearing stress of red and yellow soil in index correlated to the volume concentration. For red and yellow slurry rheological properties, the impact of density was most significant. In addition, it was discovered that the grain size distribution, clay granule contents, mineral composition and its content were the important causes for the differences of red and yellow soil rheological properties as well. The research findings are hopefully of help to reveal the mechanism of debris flow hazard in the two areas.关键词：Bailong river;Xiao river;Debris flow slurry;Rheological behavior;Comparative study
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发布时间：2023-11-14 - 摘要：Abstract:In order to research structural seismic damage performances of long-span fly-swallow type concrete-filled steel tubular arch bridge under traveling wave effect, an arch bridge with a 280 main span was taken as a bridge sample. Seismic records of the Chi-Chi earthquake in Taiwan were taken as ground motion samples. The numerical analysis was adopted to study the seismic damage of the bridge sample under the ground motion samples. In order to make the traveling wave effect more obvious on the bridge sample, near-fault earthquake records with long-periodic pulse were selected as ground motion samples. The research result shows that the seismic design requirement is met under the identical support seismic excitation; the seismic resistance regulation’ No Damage With Weak Earthquake’ is not satisfied under multi-support seismic excitation. In a word the bridge damage increase about 21% included in the traveling wave effect.关键词：bridge;concrete-filled steel tube arch bridge;seismic analysis;traveling wave effect
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发布时间：2023-11-14 - 摘要：Abstract:Sediment sorting of debris flow affects the kinetic and dynamic characteristics such as erosion along the distance, movement distance and impact force. A better understanding of sediment sorting will improve research of control engineering and sensitivity division. 105 experiments were conducted to study the effect of material composition, flow and gradient on sediment sorting of debris flow head with artificial preparation of sand. The results showed that the sediment sorting increases firstly and decreases secondly as the increase of content of sand grain or gradient or flow. In order to consider the influence of each factor, sorting ratio (R) was defined as the function of stream power and underwater gravity of sediment. As increasing, sediment sorting of debris flow head increases firstly, decreases then. Finally, the model of sediments sorting of debris flow was established and validated.
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发布时间：2023-11-14 - 摘要：Abstract:In order to analyze the complex constitutive behavior of titanium alloy under different strain rates, a new titanium alloy viscoplastic constitutive model is proposed basing on the plastic deformation mechanism and the dislocation dynamics theory. The relationship of model parameters and micro structure characteristics, as well as the physical significance are described. As the constitutive model contains 12 undetermined parameters, the identification of parameters would be computationally expensive. An overall analysis method of parameter sensitivity based on the Latin Hypercube Sampling (LHS) method and spearman rank correlation method is developed, which is effective and accurate enough in identifying parameters. Furthermore, on the fundamental of the analytic result of parameter sensitivity and basic Genetic Algorithm (GA), an advanced genetic algorithm based on the advanced niche genetic algorithm, global peak value determination strategy and local accurate searching techniques is developed. Finally, taking Ti-6Al-4V alloy as example, the single axis flow stress-plastic strain curve of this alloy under different strain rates and temperatures is described, and the results of numeric simulation matches very well with experiment data from the existed reference.关键词：dislocation mechanics;titanium alloy;viscoplastic constitutive model;parameter sensitivity;advanced genetic algorithm
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发布时间：2023-11-14 - 摘要：Abstract:Abstract：Velocity in debris flow is one of the most important parameters for dynamic analysis and design of debris flow control works. In order to investigate the velocity profile along flow depth for particle phase and liquid phase in debris flows, the mixture of two organic liquids (Acrylic acid Polymers and ethyl acetate) was used to monitor the high viscosity of debris flow. The glass beads with uniform particle size were used as solid phase in debris flows. Both particle and liquid velocity components were investigated by PIV (Particle Image Velocimetry) measurement system under the condition of sediment flows and debris flows, respectively. The Takahashi model for the particle velocity distribution in debris flows was employed to calibrate the experimental results obtained by former researchers and measured by PIV measurement system in the experiments. The results indicated that the mixture liquid with higher viscosity produced a more uniform distribution of the particles along the flow depth. The experimental data measured by PIV system were in good agreement with the ones calculated by Takahashi model in debris flows (u/us>0.3). However, the data did not match the formers’ ones in sediment flows. It indicated that the shape of particle velocity profile along flow depth was mainly determined by the fluid viscosity and the uniformity of particles distributed in the flows.关键词：debris flow;Sediment flow;velocity distribution;Particle Image Velocimetry (PIV);Viscosity
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发布时间：2023-11-14 - 摘要：Abstract: To dealing with the large-scale image datasets with massive amount of unstructured photos, which were different in scale, view point, etc., a robust dense 3D reconstruction method was proposed. Firstly, large scale variants were considered during the neighboring image selection stage, which was proofed to be more robust for large-scale image datasets. Then, a robust depth map computing method was proposed based on the combination of the DAISY descriptor and PatchMatch information propagation scheme. Regularization was imposed by enforcing the depth consistency among different depth maps during the merging stage. Finally, redundancy 3D points were removed by using the accuracy of each points. The method could be parallelized at the image level naturally, which makes it extremely suitable for large-scale 3D reconstruction. Experimental results confirmed the performance of the proposed method, which has both high accuracy and completeness.关键词：3D reconstruction;image selection;depth map;PatchMatch;multiple view stereo
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发布时间：2023-11-14 - 摘要：Abstract: In order to solve out the knowledge reduction task for the explosive increment big data, a novel attribute co-reduction algorithm (CMQEACR) based on cloud computing and multi-layer quantum elitists was proposed in this paper. First, the large-scale dataset was decomposed into different evolutionary frog subpopulations under the MapReduce cloud mechanism, and the optimal solutions of subpopulations were attained, respectively. Second, the strategy of attribute co-reduction based on the elitist vectors of multi-layer quantum frogs was constructed, and the vectors of elitist subpopulations with the strongest optimization ability of both global searching and local exploration ware selected out. This strategy could guide each subpopulation to obtain its respective minimum attribute reduction. So the global optimal reduction set could be achieved efficiently. The experimental results indicated the effectiveness and accuracy of proposed algorithm for attribute reduction on big data, compared with the representative methods. Meanwhile, the proposed algorithm was used for the segmentation of MRI in the electronic medical record database and the promising results showed its better applicability.关键词：attribute co-reduction;cloud computing;MapReduce model;multi-layers quantum elitists;MRI segmentation
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发布时间：2023-11-14 - 摘要：Abstract:Different Job requires different memory resource, it is difficult to assess the rationality for a memory allocation to a MapReduce Job. Trying to solve this problem, we present an assessment method and recommendation for memory settings of JVM where Job’s tasks run. Firstly, we introduce some important GC metrics based on our analyzing JVM’s memory allocation and GC workflow in-depth; Then, we introduce three kinds of indicators and memory allocation rationality evaluation method based on the three indicators; Finally, we introduce two kinds of optimal JVM configuration recommendations: By using of K-means algorithm and statistical information to estimate the threshold value of the object size which should have been allocate in old generation; By modeling GC pause time and using search algorithm to predict the size of young generation and the old generation. Experimental results show that the proposed approach can automatically find insufficient of memory configuration of a Job. Compared with using machine learning methods, the proposed method does not need to run a large number of test cases, so the proposed method can apply to production cluster of MapReduce.
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发布时间：2023-11-14 - 摘要：Abstract:In view of exiting shortages of the commonly used mathematical model of arrival flights scheduling ( minimum delay time and minimum delay cost), the paper chose four indicators, including air delay cost, passenger delay cost, subsequent delay cost and environmental pollution cost to comprehensively establish an improved mathematical model of minimum delay cost. On the basis of analyzing insufficient ability of seeking optimization and slow convergence speed for the existing particle swarm optimization based on simulated annealing (SA-PSO) algorithm, an annealing strategy of linear differential decrease was applied to SA-PSO (LDD-SA-PSO) algorithm, thereby more effectively solving arrival flights scheduling. The experiment results demonstrated that compared with first come first serve (FCFS), particle swarm optimization (PSO) and SA-PSO, LDD-SA-PSO algorithm has better ability of seeking optimization and convergence speed on the arrival flights scheduling, and that the parameters of improved mathematical model also has obvious influence on the optimization results.关键词：arrival flights scheduling;minimum delay cost;mathematical model;particle swarm optimization(PSO);linear differential decrease(LDD)
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发布时间：2023-11-14 - 摘要：Abstract:In order to provide personal friends recommendation service,social networking sites often recommended friends through registered users’ property or common user neighbor friends. Because of the lack of deep mining to user relationships, the recommendation accuracy was not high. In this paper, formal concept analysis was leveraged to acquire knowledge in data. Two concept lattices were built from the user feature attributes and social networking diagram. The random walk method SRWR was proposed and then the FCASRWR method was put forward with the guidance of concept lattice .The FCASRWR method measured the similarity between users, and recommends friends according to the similarity algorithm to users. The Experiments used Facebook's real datasets , and the experimental result showed that the proposed method had a better performance and proved the accuracy of the method.关键词：social network;formal concept analysis;random walk;friends recommendation
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发布时间：2023-11-14 - 摘要：Abstract:The inspection robot along the ground wire has been widely studied and applied to the detection for high voltage transmission line because of its significant advantage of extensive vision. Since the inspection robot could not go through the ground wire fittings directly, it was a significant challenge to study the way for the robot to navigate these obstacles. Basing on the comprehensive considerations of the structure characteristics of the ground line fittings, the reconstruction schemes for the damp, the suspension clamp, and the top of tension tower have been proposed in this paper. The strength calculation of the reconstructed suspension clamp has also been checked. A new inspection robot with the integrated structure designate method has been implemented. The motion plan for the robot to run across obstacles was also proposed by considering the characteristics of the reconstructed obstacle fittings. In order to test the reliability and efficiency of the robot to navigate these obstacles, an experimental system with 1:1 of practical high voltage transmission line and ground wire fittings was established in the experiment field at Wuhan University. The obstacle negotiation test results showed that the inspection robot ran safely and had higher efficiency to cross the ground line fittings, which were reconstructed according to the schemes proposed in this paper.关键词：inspection robot;running across obstacles;ground line fittings reconstruction;motion plan;Type "T" tension tower
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发布时间：2023-11-14 - 摘要：Abstract:This paper creatively put forward a new rolling shear mechanism which is driven by one horizontally positioned hydraulic cylinder by analyzing the present hydraulic shear mechanism at home and abroad. Moreover, based on the linkage, the simplify model of PR-11RⅢ-level composite rod linkage mechanism is obtained. Besides, in order to meet the demand of pure rolling, the kinematical analysis about the rolling shear mechanism is achieved by means of the building of closed loop vector method, then the kinematical simulation analysis is calculated with the help of the software of MATLAB/Simulink. Finally, depending on the development project on extensive popularization of 2000 mm rolling shear mechanism driven by one hydraulic cylinder for some large machine company, the simulation of the mechanism motion trajectory is conducted. The result of the simulation and the trajectory shows that the horizontal offset of the shear blade arc and the value of the overlap between the upper and lower shear blade are meet the design requirements, thus fully proves the reasonable of the rolling shear mechanism and the correctness of the kinematical analysis.关键词：Composite rod linkage mechanism;Kinematical analysis;Closed loop vector method;simulation;Overlap value
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发布时间：2023-11-14 - 摘要：Abstract: Metal structures often process defects caused by stress, corrosion and fatigue. Among kinds of non-destructive testing technologies, alternating current potential drop technique (ACPD) as a valid method has been widely used in pitting corrosion and crack measurement. When ACPD is used to test different kind of defects, due to the various geometry shapes, the approach to solve defect depth is different as well. Therefore, it is essential to classify and identify the measured defects in the test region. The purpose of this paper was to find an approach which can classify different defects accurately. In this paper, we studied on two kinds of typical defect based on an eigenvector which consists of 4 adjacent drag factors. After large quantities of simulation, the pitting and crack eigenvector datasets were built. Moreover, a support vector machine (SVM) optimized by genetic algorithm and trained by eigenvector datasets was obtained. Simulation test data showed that the trained and optimized SVM model has a high classification accuracy, and the metal plate experiment also indicated that the model has a good precision in actual defect classification. All the experiments showed that the proposed approach used for defect classification had high precision in pitting and crack classification.
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发布时间：2023-11-14 - 摘要：Abstract:The worm drive efficiency was improved in order to require the higher precision,the hourglass worm equation of the complete eveloping contact line was utilized,the classical meshing theory was combined besides the parameters of the tool generatrix was fitted, the novel meshing transmission mode of the planar enveloping end face meshing engagement toroidal wrom was constructed on the former basis. The tooth-profile helical line of this worm was obtained by the drawing contact line with MATLAB; the three dimentional graphics was plotted and the kinematic simulation was analysed by using software of CREO as well.According to this reaserch:the planar enveloping end face meshing engagement toroidal worm,this newfashioned driving mode could increase the effective meshing tooth number through controlling its parameters to a certain extent,meanwhile its working length was shortened;and the gyration radius was magnified,the radial size of this worm volume was largened caused by the increscent gyration radius, however the large center distance transmission was achieved without increasing the worm gear size;also the structure of these same model retarders was more compact.关键词：Complete enveloping;End face engagement;Tooth-profile helical line;Effective meshing tooth number
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发布时间：2023-11-14 - 摘要：Abstract: A new method of solving 6R robot inverse kinematics equations based on dynamic fuzzy neural networks（D-FNN）was presented to improve its accuracy and efficiency. In view of the high-dimensional nonlinearity of 6R robot inverse kinematics equations and the complexity of solving these equations, the D-FNN was improved to fit for multiple-input multiple-output system, and also to establish inverse kinematics solution prediction model of 6R robot. Both position and orientation samples in work space were obtained through forward kinematics and were regarded as input variables of prediction model, the output variables of which were joint angles in joint space. Inverse kinematics solution prediction model was trained by sample data. At last, this prediction model was applied to complex movement trajectory simulation of KR16-2 robot, and the results of the prediction were compared with those of prediction models based on radial basis function (RBF) and back propagation(BP) neural networks. The comparison showed that the D-FNN prediction model of solving 6R robot inverse kinematics equations featured high accuracy, optimal robustness and strong generalization ability, and was proved to be feasible and effective.关键词：inverse kinematics;6R robot;dynamic fuzzy neural networks;movement trajectory
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发布时间：2023-11-14 - 摘要：Abstract:An additional stress, called edge stress, may be generated at the joint area between the conical bowl and the flange of a centrifuge. The equivalent stress at the joint was quantitatively analyzed from dimensionless theory in terms of the finite element analysis method (FEM). Three dimensionless parameters were defined for the joint between a flange and a conical bowl. One was the edge stress coefficient β1, the second was the edge peak stress coefficient β2 and the last was the thickness coefficient α. The effects of α value, bolt pre-tightening force, fillet radius, slurry density, the depth of liquid pool, rotation speed and semi-cone angle on β1 and β2 were investigated. The results showed that β2 reduced when α, fillet radius or semi-cone angle increased and increased when bolt pre-tightening force, slurry density or the depth of liquid pool increased. The influence of rotation speed on β2 was not obvious. When α or semi-cone angle reduced and slurry density or the depth of liquid pool increased, β1 value increased. The influence of fillet radius, rotation speed or bolt pre-tightening force to β1 is not apparent. Finally，the data for calculating the equivalent stresses at the joint area between the conical bowl and the flange of a given centrifuge bowl were presented and an example was used to illustrate the calculation method，which would provide valuable information for designing the centrifuge bowl in engineering practice．关键词：FEM;conical bowl;flange;edge stress;dimensionless parameters
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发布时间：2023-11-14 - 摘要：Abstract:Influence of citric acid on the performances and change laws of recycled gypsum were studied. Its mechanism of citric acid was analyzed by the related theory of chemical reaction, FTIR and SEM. The results obtained showed that the addition of citric acid delayed the hydration, decreased the strength of paris of plaster remarkablely. The water demand, setting time and 1 d strength of recycled plaster with CA (R-CP) were decreased, prolonged and reduced, respectively, the dry strength, however, was increased in comparison to the recycled plaster without CA (R-P). Compared with paris of plaster without CA (POP), the water requirement, setting time and strength of R-P were increased, prolonged and substantially reduced, respectively, and the decreasing rate of strength was approximately 40-50%. The slow increase in water demand, slight decrease in setting time and rise in 1 d strength of R-CP were seen, and the dry strength, however, was improved in comparison with paris of plaster with CA (POCP). The analysis indicated that due to the complexion between citric acid and Ca2+ into CaCit-, the growth of C axis was strongly inhibited and the hydration was delayed, correspondingly leading to the transformation of dihydrate crystal from needle-like to short prismatic, which deceased the strength of POCP. The short prismatic and CaCit- are still existed in R-CP, which can decrease the water requirement and again complex with Ca2+, thus the setting time of R-CP was prolonged and hydration was delayed.关键词：recycled gypsum;citric acid;properties;changing laws;mechanism
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发布时间：2023-11-14 - 摘要：Abstract:Aerosol emission has been the bottleneck problem for the development of ammonia flue gas desulfurization. In this paper, aerosol properties were investigated on-line. Experiments on the effect of different desulfurization phases, oxidation degree and pH value of desulfurization liquid and the analysis of the aerosol formation were carried out. As the results show, aerosols are mainly submicron particles ranging from 0.1μm to 0.4μm. NH4HSO4 and NH4HSO3 exist during the initial phase of desulfurization, while (NH4)2SO4 and (NH4)2SO3 are the main part when the system is in good running. Without oxidation of desulfurization liquid, the aerosol compositions are mainly SO32- and the amount of SO42- increases significantly after oxidation. The amount of SO32- increases when the pH value of desulfurization liquid gets higher. NH4HSO4 and NH4HSO3 exist in the aerosols formed by the heterogeneous reaction which makes greater contribution to the aerosol formation and the compositions of aerosols formed by entrainment and evaporation of desulfurization关键词：ammonia flue gas desulfurization;aerosol;aerosol mass spectrometry;on-line measurement
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发布时间：2023-11-14
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