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71.
分析了颗粒阻尼技术应用于建筑结构可能性,并指出了颗粒阻尼在建筑物上应用的具体位置和安装方式;通过单层和多层钢框架模型的振动台试验,探讨了砂子、钢珠等材料作为建筑结构颗粒阻尼材料的减振性能和减振效果。实验表明:粗砂作为建筑结构的颗粒阻尼材料,可以提供较大的等效阻尼比,能够明显减轻结构的大震反应。 相似文献
72.
73.
J. Kim 《International Journal of Automotive Technology》2008,9(6):687-693
In this article, the analysis methods for vehicle handling performance are studied. Using simple models, dynamic characteristic
parameters such as yaw, natural frequency, and the damping coefficient of a vehicle can be theoretically formulated. Here,
the vehicle is simplified by a bicycle (single-track) model, and the tire is modeled by an equivalent cornering stiffness
and first order lag. From the experimental road data, the tire model parameters (equivalent cornering stiffness and time lag
constant) are extracted. These parameters are then inserted into the theoretically formulated equations of dynamic characteristic
parameters. For the purpose of validating the efficiency of the suggested methods, experimental road tests (where the cars
have different handling performances) are performed. The results show that vehicle handling performance can be sufficiently
represented by the suggested dynamic characteristic parameters. So, it is concluded that the proposed method has practical
use for the development of new cars or for the comparison of similar cars since the evaluations of the vehicle handling performance
can be efficiently determined by the suggested dynamic characteristic parameters. 相似文献
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75.
The fatigue assessment of a well conductor is a critical design task during offshore exploration and development of hydrocarbons. In recent years, major progress has been made towards the modelling of soil-conductor interaction. Upgraded soil-conductor interaction springs (i.e., p-y curves) and damping models are developed and are gaining acceptance by the industry. However, there is a general lack of simplified procedures to incorporate the soil damping into the time-domain structural analysis of a wellhead system. Thus, the motivation of this paper is to close this gap by proposing a simplified procedure for incorporating the soil damping in the well conductor time domain analysis. The procedure is generic and allows for convenient adoption of alterative p-y spring and damping models. Design charts for equivalent soil system damping ratio versus the lateral deflection of the conductor are developed through parametric analyses based on representative wellhead configurations with typical soil strength profiles in the Gulf of Mexico to facilitate practical design. 相似文献