| 1. | A kind of impedance measurement is proposed with piezo - electric element which drives the beam and engender dynamic impedance data
摘要提出了利用压电陶瓷的阻抗测量法的概念，即用压电陶瓷作为驱动源产生动态阻抗信息。 |
| 2. | 5 . dynamic impedances of pile groups have been studied almost in a same assumption that rigid caps and soil under it do not touch each other in the present papers
5 .本论文在对群桩刚性承台动阻抗的求解过程中，首次考虑了承台底土与承台及群桩的动力相互作用。 |
| 3. | The thesis account for the dynamic impedance of pile groups without the aboved - mentioned assumption . so , that the soil under caps affects the caps and piles is discussed
目前对群桩动阻抗研究的文献，始终局限在刚性承台底与土脱离的假设，而没有考虑实际存在的承台底与土接触的情况。 |
| 4. | Vertical dynamic impedances of piles and rigid foundations of arbitrary shapes , vertical dynamic interactions between pile groups and raft foundations , optimization of pile groups are studied in the thesis . 1
论文围绕群桩竖向动阻抗、任意刚性基础的竖向动阻抗、群桩与承台板的竖向动力相互作用及群桩的动力优化布置进行了系统的研究。 |
| 5. | In this paper , a simplified model for dam - foundation dynamic interaction analysis in time domain is proposed in terms of the studying of the characteristics of the dynamic impedance of canyon cut in elastic half - space
通过对拱坝地基的半无限空间动力体系的分析，提出了拱坝-地基动力相互作用问题的简化求解途径，并结合小湾拱坝进行了实际分析。 |
| 6. | Abstract : in this paper , a simplified model for dam - foundation dynamic interaction analysis in time domain is proposed in terms of the studying of the characteristics of the dynamic impedance of canyon cut in elastic half - space
文摘:通过对拱坝地基的半无限空间动力体系的分析，提出了拱坝-地基动力相互作用问题的简化求解途径，并结合小湾拱坝进行了实际分析。 |
| 7. | The matlab language is used to calculate the pile - group - impedance , and the numerical calculation shows that the axial load only has effect on the numerical of the pile groups " dynamic impedance function , but has not effect on the frequency
利用matlab语言编程，实现群桩动力阻抗的计算，通过研究发现，轴向力仅仅影响群桩水平阻抗函数的数值，并不影响阻抗函数的频率。 |
| 8. | Finally , this paper performs a dynamic analysis on a large - scaled paper machine adopting the substructure method based on the dynamic impedance of the pile foundation gained by the finite element method and by the dynamic code method respectively
最后，本文利用子结构方法，利用本文有限元计算得到的桩基动力阻抗和《动规》方法求得的桩基阻抗，对一大型造纸机的桩基-机器系统进行了动力分析。 |
| 9. | In view of the system complexity , it is difficult for a number of previous methods to consider the embedded cap effects on the dynamic pile - soil interaction system . as a result , the dynamic impedance of a pile group with embedded cap was rarely reported
由于系统的复杂性，以往桩-土动力相互作用研究的很多方法难以考虑承台的埋置作用，因此有关埋置承台(低承台)群桩动力特性的研究报道很少。 |
| 10. | But the cases of two or more foundations were not presented because the interactions between foundations were not considered in all present papers . this thesis eliminates two faults named above by using the assumption of the plane strain and of dynamic foundation - soil interaction factors . the calculating method of dynamic impedances presented by the paper proved to be accurate and practical
过去许多学者通常将任意形状基础的外包规则几何形状代替原有的不规则基础形状，以达到确定动刚度和阻尼系数的目的，显然计算结果是近似的；本文将任意刚性基础划分为规则的小型基础，然后求小型基础之间的动力相互作用因子，最后得到任意刚性基础的动刚度和阻尼，而且这种方法也可考虑相邻基础产生的影响。 |
