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The deformation of a TVM's body frame was calculated and the structural FEA (Finite Element Analysis) was accomplished in this paper. The geometric model and finite element model of TVM (Ticket Vending Machine) were built. To locate the maximum stress and displacement precisely, structural analysis of the TVM's body frame under its gravity was analyzed by FEA software. The results indicate that the...
Torsional vibration is universal in the main drive system of rolling mill. In this paper, the spring-mass system dynamic model describing torsional vibration is built, and proved to be feasible through comparing the first-order natural frequency with the experimental result. On the basis of the validated model, the modal energy and flexibility distribution is analyzed and the results indicate that...
At present, three-dimensional parametric CAD technology is used widely in the field of agricultural mechanical design. Based on the analysis of matsune shovel's structural features for the stubble harvester machine, matsune shovel solid model was drawn by using three-dimensional CAD software Pro/E. Matsune shovel's static analysis was done by finite element analysis software ANSYS Workbench, and static...
Manipulator for transplanting rice seedlings is key work parts of high-performance rice transplanter. The advantages and disadvantages of its structural parameters have direct impact on performance of transplanting rice seedlings. Mathematic model of the manipulator was established firstly, and optimization program with visual human-computer interaction was compiled based on the software of Visual...
The uniform design method was adopted and developed to take structural optimization. A novel algorithm based on number theory, named residual table, was established to decide the optimal direction in process of optimization. The maximum of function was studied to verify its feasibility. The computed results with the developed method show the optimization solution is independent on initial iteration...
First, we introduce the iterative method of the modified elastic compensation method (KtECM) proposed by the authors for plastic limit load analysis of structures containing flaws. Then, plastic limit load of tee joint containing corner cracks under internal pressure is computed by using the KtECM and the elastic-plastic analysis method (EPAM). During computations, we adopt both 3-D tee joint geometry...
Take support structure as the object, studied the multi-objective optimization of optimization layout of structural materials and maximize natural frequency under multiple load cases. Based on the SIMP (solid isotropic material with penalization) method, compromise programming method was adopted to define objectives of multi-objective topology optimization. With the supporting structure for the study,...
In the past decades of years, nightscape construction of the city has extensively developed with the increasing development of city construction. The nightscape design not only provides comfortable atmosphere for people's night action, but plays a key role in constructing the image of the city as well. The author examines Shanghai, the first city in China to engage in the construction of nightscape...
Bouncing is a typical activity of human body and it can generate dynamic loading which should be considered in various occasions. Three different bouncing load models in literature are compared in this paper, including the theories developed by E. Duarte and T. Ji in 2009, J. G. Parkhouse and D. J. Ewins in 2006, J. W. Dougill et al. in 2006. Base on the coefficients given in literature, the comparison...
A comparative study on the seismic response of the structure isolated by the friction pendulum system under unilateral and bilateral ground motions is conducted in this paper. It is found that, under the bilateral ground motions, the accelerations of the superstructure in X and Y directions are reduced, however, the displacements of the bearing in X and Y directions are increased. The methods according...
Piezoelectric ceramic (PZT) transducers, which can be surface-mounted on or embedded in structures, are widely used for structural health monitoring. Since they are only sensitive to cracks nearby, the use of ones pasted on structures' surfaces may not be able to detect accurately the deep damages especially in large size structures. Therefore, the embedded PZT transducers display more advantages...
Based on the engineering construction of new subway across existing metro tunnel, the settlement law of the existing metro concrete structures was researched due to construction perturbation under existing metro tunnel. According to the in-situ monitoring information and engineering geological conditions, the foundation model, structure analysis model and settlement curve model which are suitable...
Strain mode is sensitivity to structure local characteristics and wavelet transform has high local property in time and frequency domain. By combining the character of strain mode and wavelet transform, strain mode is adopted as response signal to continuous wavelet analysis for damage identification. Damage location is detected by modulus maximum and damage extent is detected by Lipschitz exponent...
Based on a practical engineering project (in yanjiao), which uses composite foundation with CFG & GC piles to improve the bearing capacity of composite foundation and deal with the soil liquefaction. The composite foundation's capacity and function mechanism are analyzed in the paper, and test results of the composite foundation are also discussed. These include the test results of the carrying...
Numerous connections brittle fracture happened in the Wenchuan Sichuan earthquake, which indicates that cognitions on the damage mechanism of beam to column connection are rather inadequate. It need to improve in constitution, there are four kinds of connections are analyzed by the finite element. Under the repeat load, which seismic behavior of improved connections are better and can satisfy the...
In this paper, dynamic response of a Long-span Concrete Filled Steel Tube Arch Bridge (346m) during strong earthquake was studied with damage model of steel tube and concrete of rib by the explicit dynamic analysis code. Model is built with 2-node explicit 3-D Beam and explicit Thin Structural Shell, and material model is the kinematic hardening model. The development of the arch rib concrete filled...
A damage identification method based on improved genetic algorithm (IGA) is presented that accurately identifies both the location and severity of damage in a simulated 3-span continuous beam bridge. Damage identification based on finite element model updating is often used and damage is identified by minimizing the error between measured and analytical results. But whether model updating can be carried...
Generally, the geometric non-linearity is ignored in numerical simulation, especially in some numerical simulation of concrete structure, but now it is confirmed by a large number of experiments that the response of the concrete structure under ultimate load depends both on material nonlinearity and geometric non-linearity. So in order to analyze the fracturing behavior of the structures under ultimate...
In this paper, according to the technical characteristics of the maintenance of cable of cable-stayed bridges, a new robot for cable maintenance is developed. The climbing equipment, the surface inspection equipment and the internal defects inspection equipment, the cleaning equipment, the spraying equipment for cable maintenance are all designed as reconfigurable module. According to different cable...
In order to simulate the typical road tunnel fire, the causes of fire and kinds of fire were analyzed. One kind of CFD software FDS was used to simulated the three kinds of fire scales. The temperature and visibility of tunnel zone were calculated. The simulation results show that the highest temperature of central axis section reaches to 720°C, and the highest temperature of side wall reaches to...
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