对饱和多孔介质波动问题中本构关系的探讨

依据连续介质力学的混合物理论，讨论了饱和多孔介质的波动一般方程。其中考虑了质量耦合、初始压力及其浮力效应等。对于澄清这一研究课题中的某些基本概念，以及完善其理论体系具有重要意义。）其中ｖ￣（２）为速度涨落，于是单位体积内流相的动能为：因此将流相动能的涨落Ｋ￣（２）归于自由能更自然些。又因为当：ｖ￣（２＊）≡ｖ￣１时，即Δｖ＝ｖ￣１－ｖ￣２＝０时ｖ￣（２）＝０，此时Ｋ￣（２）＝０而且显然Ｋ￣（２）随着Δｖ·Δｖ的增大而增大，一个简单的近似是令Ｋ￣（２）＝ρ·Δｖ＿ｋ·Δｖ＿ｋ并且是常数。由此可导出表现质量力。由自由能的非负性质知，所以有．由（４．１３ａ）很容易推出质量密度矩阵的对称性和正定性。参考文献     

单桩动力特性影响因素分析

本文通过对复合平面应变近似法的改进，导出单桩桩基的动力复刚度，分析影响桩基动力刚度和阻尼的因素，得到一些结论，为桩基优化设计提供依据     

附着于运动基上的弹性体的有限元动力学方程及其Neumann级数解法

采用运动参考系方法，根据Ｊｏｕｒｄａｉｎ动力学普遍方程，导出了具有给定空间运动的弹性体的有限元动力学方程。提出了求解这类动力学方程数值解的Ｎｅｕｍａｎｎ级数－直接积分法。与经典算例的比较说明了所提出的方程和计算方法的正确性与优越性。     

EXACT SOLUTION FOR A TWO-DIMENSIONAL LAMB＇S PROBLEM DUE TO A STRIP IMPULSE LOADING

By applying the integral transform method and the inverse transformation technique based upon the two types of integration, the present paper has successfully obtained an exact algebraic solution for a two-dimensional Lamb＇s problem due to a strip impulse loading for the first time. With the algebraic result, the excitation and propagation processes of stress waves, including the longitudinal wave, the transverse wave, and Rayleigh-wave, are discussed in detail. A few new conclusions have been drawn from currently available integral results or computational results.     

铁磁性梁的振动和动力稳定性

本文研究了线性铁磁性简支梁在轴向力和横向磁场作用下的振动和动力稳定性,导出了有涡电流时梁的动力学方程,并讨论了涡电流对梁动特性的影响.     

Propagation of elastic waves in water-saturated soils

A brief review of the literatures on the titled subject is given. A set of wave equations, taking the inertial coupling effect between soil skeleton and pore water into account, are established for saturated soils. The preliminary analysis shows that the nature of wave propagation is mainly influenced by permeability coefficient,k. There are three types of waves, two (P-and S-wave) propagating through soil skeleton and one(P-wave) through pore water. For a soil with large value ofk, compression wave velocity through pore water will be greater than that through single-phased water, and ask→∞, the former could be times as great as the latter. For a soil with extremely low permeability, the compression wave velocity could be either less or greater than that through single-phased water, depending on the rigidity of the soil passing through. Some phenomena observed from tests presented in the literature may be reasonably explained by the proposed theory herein, and thus more reliable parameters of soil could be obtained from wave velocity measurements. Further studies on this subject are still needed. This paper is a part of the dissertation of the first author for the Ph.D. degree, the second author is his advisor.     

考虑弹性地基切向抗力的变截面圆弧壳梁分析

本文根据弹性薄壳理论,考虑了弹性地基径向和切向抗力的影响,解决了变截面圆弧壳地基梁的难题,作者所提出的近似解析法和加权余量法、传递矩阵法较有限单元法简便.     

采用压痕实验获得材料性能的研究现状

本文综述了采用压痕实验获得膜基体系中薄膜弹性，塑性，蠕变性能的研究进展，并指出了目前研究中存在和需要解决的问题。     

FBRE系统偏心力下的功率流特性及主动控制

利用机械阻抗方法推导了偏心力作用下，机器－隔振器－柔性板基础所组成的FBRE隔振系统的动态传递方程。以传递到柔性板基础的功率流为目标函数，通过计算机仿真计算，研究了在对称系统中偏心力作用下的功率流特性，分析了和对称力、力矩作用效果的不同和联系，并探讨了主动控制策略的效果。     

Behavior of a floating elastic plate during vibrations of a bottom segment

The Wiener-Hopf technique is used to obtain an analytical solution for the problem of vibrations of a floating semi-infinite elastic plate due to earthquake-induced vibrations of a bottom segment. An explicit solution is obtained ignoring the inertial term. The surface-wave amplitudes and ice-plate deflection are studied numerically as functions of the frequency and position of the vibrating bottom segment, ice thickness, and fluid depth.Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 2, pp. 98–108, March–April, 2005.