Papers by Keyword: Dynamic Propertry

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Authors: Feng Lin Gan, Xu Bo Jia
Abstract: In the paper aiming at lots of 87(LM21) towers in Dongchang Hasong Transmission Line held under Changchun Extra-high voltage Bureau jurisdiction, by using ANSYS software, the nonlinear finite element model for towers is built. And numerical analysis methods is adopted. It is considered that the combined effect of stay wire and transmission tower, geometric non-linear effect and the influence of stay wire initial stress. The Dynamic Properties research about Guyed Transmission is conducted. It concluded that stay wire and tower's mode of vibrationare are relatively independent ,coordinated and the interaction of each other. Natural frequency of vibration and mode of vibration appears regularly and alternately changes with the increase of the formation order .Stay wire initial stress is main factor affecting the natural frequency of the structure and the frequency increases with the increase of stay wire initial stress.
Authors: Zhi Qiang Zhang, Ai Qun Li, Yong Sun, Meng Ya Huang
Abstract: In this study, the seismic behavior of the main tower building of Beijing Yintai Center is presented with regard to the dynamic characteristics analysis and seismic response analysis. Firstly, by means of three-dimensional finite element analysis software, the dynamic properties and seismic responses under frequent earthquake action of the structure are obtained, respectively. It can be seen that the structure has a rational arrangement for structural elements and has a good seismic behavior. Then, the seismic behavior of the structure is studied through the dynamic elasto-plastic analysis method and static elasto-plastic analysis method under rare earthquake. Analysis results of both analysis methods show that the behavior of the structure accords with the earthquake performance objectives and the structure would not collapse under the rare earthquake action.
Authors: Ya Zhou Qin, Qi Chen
Abstract: This paper presents an improved anisotropic bounding surface model which is based on Wheeler’s elastoplastic model (S-CLAY1). The developed model is programmed in ABAQUS software by writing UMAT subroutine, which is integrated in Return Mapping Algorithm. The parameters sensitivity analysis is implemented on plastic modulus. The study shows that the developed anisotropic bounding surface model is capable of describing the dynamic properties of soft clay.
Authors: Yang Yang, Jian Min Ren, De Zhi Liu
Abstract: Taking into consideration of the boundary conditions in fluid-solid interactions, the author built the FSI large rectangle aqueduct model of dynamic analysis according to the equation dynamic performance of the fluid-solid coupling system. Large aqueduct of the dynamic properties were analyzed with asymmetric eigenvalue method, dynamic properties rules were calculated by changing the depth of the water in the aqueduct. Aqueduct, also called elevated canal, is usually built over valley, lower land or river for conducting water from a distance or even for shipping.The aqueduct is one of the most important hydraulic structures in Yindaruqin Irrigation Project. After aqueduct is built, all kinds of reasons get its degree of safety descent so as to affect its ordinary running with the time going. Based on fluid-solid coupling system, a FSI analysis model of the aqueduct structure is established.
Authors: Da Ming Han, Shi Qiang Sun, Shu Quan Li
Abstract: With the rapidly developing of our country's economy, the demand of diesel fuel is increasing. But the fuel resource is limited. Because diesel fuel's incomplete combustion can pollute environment, it is getting more and more attention of people. The current problems of saving energy and reducing consumption needed to resolve, especially diesel particulate after combustion emissions are gasoline 30 to 70 times. The environmental pollution caused by automobile exhaust already quite serious, in this new clean diesel exploring alternative fuels is imperative, the research of this aspect has also been the world attention. A bench test of 490QB diesel engine was conducted with self-developed heavy aromatic fuel mixture of coal. Road test proves that using heavy aromatic fuel mixture of coal on diesel fuel can save fuel. The power performance of heavy aromatic fuel mixture of coal was equivalent, and fuel consumption decreased and smoke emissions reduced obviously compared with common diesel fuels.
Authors: Xiang Tao Xu, Xiao Hu
Abstract: In this paper, seismic behavior of the frame-shear wall structure, which are respectively composed of the concrete filled steel tubular (CFST) and of the reinforced concrete (RC) column, have been studied under the conventional earthquake. Dynamic behaviors and earthquake responses including deformation and forcing of the CFST and RC structures are analyzed. Comparing the calculation results, the earthquake resistant behavior of the CFST structure has been evaluated synthetically, which may be referential for structure design.
Authors: Hong Yan Yang, Ge Jin Hu
Abstract: A comprehensive mathematical model of the hydraulic inlet and outlet throttle speed-regulating system was established that included most components’ dynamic characteristics such as the hydraulic cylinder, the throttle valve, the hydraulic pump, the relief valve. The simulink of matlab was used to emulate the equations. The system parameters for example throttle opening area, oil bulk modulus were analyzed how to influence the dynamic characteristics of throttle speed control system. How to correctly select circuit under working condition and how to improve equipment performance in the hydraulic system design are indicated through comparing the dynamic characteristics of inlet and outlet speed-regulating circuit.
Authors: Rui Zhang, Zhen Fu Chen, Yuan Chu Gan, Qiu Wang Tao
Abstract: In this paper, modal characteristics of self-compacting concrete (SCC) beams were studied through experiment. 3 self-compacting concrete beams were gradually damaged and then subjected to vibration test in free-free boundary conditions after each load step. From analysis, eigenfrequencies could indicate the existence of damage but it could not represent the damage locations. Modal Assurance Criterion (MAC) is lesser reliable to indicate crack damage compare to eigenfrequencies. Next to these, capacity for damage detection and localization of Coordinate Modal Assurance Criterion (COMAC) and the flexibility matrix method are also examined and compared. This paper introduces in detail the dynamic properties and damage localization methods in SCC, which provide basal databases of damage diagnosis for SCC structures and promote the popularization of SCC in civil infrastructures.
Authors: Lei Niu, Quan Jie Song, Shuang Xu, Xiao Ming Guo
Abstract: The shear modulus and damping ratio are two important index in equivalent nonlinear model which is widely used in seismic response analysis. GDS resonant-column is used to study the shear modulus and damping ratio of highly weathered granite by controlling the consolidation confining pressure and pore water pressure. Variation of resonant frequency, shear modulus and damping ratio can be observed when different effective stress which is changed with confining pressure and pore water pressure applied on the sample. Hadin-Drnevich fitting curves are given on the basis of experimental data, and damping mechanism of highly weathered granite is discussed by making use of frictional theory. We can conclude from the results that there is a positive correlation between resonance frequency and shear strain, while there is a negative correlation between samples damping ratio and shear strain. The effective stress impact both samples shear modulus and damping ratio. However, pore water pressure can only act on damping ratio.
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