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Aim at the problem that the plan of relief military logistics support is a representative sophisticated, imperfection of information and undefined grey system because factors of influence are big and subjective influence is big by appraisal main body. So, the paper establish model of grey incidence analysis that selecting plan of relief military logistics according to thought of grey system, calculated...
This paper investigates the influence of soil-structure interaction (SSI) on seismic responses of long-span space truss roof. First, a three-dimensional (3D) integral finite element (FE) model of a typical regular pyramids space truss structure consisting of space truss roof and support columns is developed. By applying FE method for near field soil and infinite element (IE) method for far field unbounded...
The steel box beam in the Gulf Bridge adopts huge segment lifting construction method, with steel tube falsework as a temporary bridge pier. In this paper, established the finite element model of the steel tube falsework, determined the relevant calculation parameters according to the applicable bridge codes, calculated working conditions and the load, and analyzed the stability of the falsework....
The supply-demand is the key research object in the market economy. Tourism cannot be realized without the supply of the tourism destination and the demand of the traveling source of tourists place. And "field" is a ubiquitous objective phenomenon that is invisible and intangible. The tourist destinations not only have the supply-demand fields but also the competition fields among destinations...
GH4169 is a difficult-to-cut nickel-based superalloy commonly used in aerospace industry. This paper presents a cutting force prediction model in the end milling of GH4169 superalloy with carbide tools by orthogonal experiment. The variance analysis is applied to check the significance of the model, accuracy of the model is verified by experiment. The effect of cutting parameters on the cutting force...
In this paper, the spatial six-DOF(degree of freedom) parallel manipulator is described as a rigid body, and in many cases, this simplification is adequate for describing the properties of the whole mechanical system, especially with large and heavy motion system. By using Kane approach the explicitly forward dynamic equations with six variables are gained straightly and readily. Under identical conditions,...
To make the members for group discussions well-mixed, the compound variable of four weighting factors is used to meet the quantification of the four judging criteria. Exclusion force is introduced here to evaluate whether a certain member should be assigned into a certain group or not. Then the algorithm is realized with the use of computer programs with the current state be used. Analysis of the...
For the system of macro micro-feed table, deformed guide rail joints is designed using of flexible hinge. The 2D stiffness matrix is derived from principle of minimum potential. And the stiffness matrix is applied to micro-feed table which contains deformed guide rail joints. The simplifying computation model of the micro-feed table is obtained. The results of simplifying model are compared with finite...
An automatic exchange device for manipulators is proposed based on multi-sensor considering the application background of the space robot in this paper. A micro-regulator is installed in the robot's wrist. Rough positioning with vision guiding, precise positioning by optical guiding, posture adjustment and active-passive hybrid compliant control strategy are used in docking. Both geometric constraint...
The financial crisis which sweeping the whole global has destroyed many enterprises to extinct, But there are also companies in the wake of the financial crisis become the more powerful, the reason is that the dominant force of innovation promotes the enterprise sustained development and growth. The effect of the dominant force of innovation make the dynamic energy and potential energy of company's...
Shaft lining thickness change constructions is common in shaft construction process where shaft lining fracture will increase. By implementing monitoring at shaft lining thickness variation regional, contrastive analysis based on the measured data, it is revealed that the stress fracture is associated with the ways of shaft lining thickness change. Compared with the gradual type construction method,...
A new type of monorail hanging technology was invented to solve the auxiliary transportation problem in soft rock or coal bed roadway, and clearly introduced the hanging scheme and making a feasibility analysis. This new type of monorail hanging technology makes the monorail application in soft rock or coal bed roadway to be possible, solves a major problem in mine auxiliary transportation mechanization...
Engineering change is one of the important issues in contract management. To strengthen management and control of engineering change have great significance for the achievement of contract management objectives. Researches on responsibilities of engineering change risk factors offer a new thought for improving level of cost management and control of engineering change. The study method in this paper...
A review of literature about the effect of various Reynolds numbers, being based on kinematic viscosity and sliding velocities each other, on improvement of sliding elements tribological performance is shown. This is accomplished by the computational fluid dynamic approach where the momentum and continuity equations are solved separately, one of low Reynolds number (LRN) turbulence models-Abid index...
An slitted shear wall combined with keep-warming layers and dissipating energy forms, is represented in this paper. This new type shear wall has multi seismic resistant system. Based on the advantages of the new type of shear wall, six model specimens were designed and fabricated. By cyclic reversed loading test, the structural dynamic performances such as internal force, deformation behavior, energy-dissipating...
The relation between minimum thickness of cut (MTC) and the extreme machining accuracy attainable for a specific cutting condition by Atomic Force Microscope (AFM) has been discussed. A mechanical model was used to describe qualitatively the minimum thickness of cut during nanometric cutting process. Mechanical response of aluminum and copper on nanoscratching has been studied. The analysis of the...
The actual bridge structures are not situated in the vacuum environment, so the dynamical behavior of the bridge structure will be affected with the geometrical deformations and the mass distributions due to the variation of the ambient medium, especially along the augment of bridge span. Taking into the effect of the static wind, temperature and deep water account synthetically, this paper analyzes...
Based on the analysis of blasting smog-dust source and its Characters, the Movement of blasting smog and dust is discussed. The concept of particle system is developed. Further more, the blasting smog-dust movement and the plume diffusion in atmosphere was profound explored. Finally, the real-time simulation of Movement of Smog-Dust generated by blasting is implemented and generated a program named...
Chongqing Chaotianmen Yangtze Bridge with the main span of 552m is the steel truss continuous tied arch bridge. Track cross beams of the lower layer and nodes of main truss are connected by high-strength bolts. To verify fatigue security performance of this node connection, large-scale model of 1/2 is applied in node fatigue test. In the 2 million fatigue tests during design life, the high-strength...
In order to simplify analysis of the dynamic characteristics and seismic response of the integral abutment curved box bridge (IACBB), automatic iteration of the multimode modal response spectrum (MMRS) is realized by APDL language of the structure analysis software ANSYS according to the IACBB's structural characteristics. The realization flow of iterative MMRS in Ansys were presented, and the availability...
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