The evolution of shock waves in a viscoplastic bar with variable section 粘塑性变截面杆中冲击波的演化
Semi - analytical solution for vibration of pile with variable section in layered soil 分层土中变截面桩振动问题半解析解的研究
Study on vertical vibration of viscoelastic pile with variable sections in layered soils 双层地基中瑞利波引起的桩土竖向共同作用
Variable section beam 变截面梁
A number of constructions drawing method and their rule that are similar like variable section arch 一束形似变截面圆拱的构造图式方法及其规律
2 . longitudinal vibration of pile with variable impedance ( variable sections or modulus ) in layered soil undergoing arbitrary load is theoretically investigated 2 、对成层土中变阻抗(变模量或变截面)桩在任意激振力作用下的纵向振动特性进行了研究。
Taking advantage of hear forces current theory ? this paper deduces the formula of bending shear stresses , in which the influences of axial force , bending moment , variable section depth and the variable thickness of top slab , bottom slab and webs are taken into account 本文利用“剪力流理论”推导出了弯曲剪应力的公式,该公式不仅计及了轴力和弯矩对弯曲剪应力的影响,还计及了截面高度、顶板、底板及腹板厚度变化对弯曲剪应力的影响。
Based on the solutions proposed herein , the longitudinal vibration properties of an integral pile in a uniform soil or layered soil , a pile with variable sections or variable modulus in a uniform soil are discussed respectively . the influence on the curves of complex stiffness , mobility and reflection wave of pile caused by soil modulus , the degree of pile defects , and the length and location of pile defects are emphatically discussed . 3 利用所得解分别对均质土中完整桩、成层土中完整桩、均质土中变截面桩和均质土中变模量桩的纵向振动特性进行了分析,重点讨论了土层模量变化、桩身缺陷程度、缺陷段位置、缺陷段长度等因素对桩顶复刚度、速度导纳和反射波曲线的影响。
The exhaust system and muffler are simplified as a set of 1 - d pipes with non - isentropic flow and with variable sections . the partial differential equations of non - stationary flow are transferred into the stationary differential equations by means of the characteristic lines . these equations are solved by finite difference method 在排气管系的计算中将排气管简化为一组一维非等熵变截面管,并通过“特征线法”将描述其运动的非定常流的偏微分方程转化为常微分方程,再用差分数值方法依靠计算机求解。