Cosine functions are supposed to simulate the longitudinal displacement of thin-walled box beams when bended.
假定箱梁的纵向位移沿横截面满足余弦函数分布,考虑荷载沿横向的作用位置的影响,采用广义变分原理推导出了等截面梯形箱梁发生对称挠曲时的剪力滞效应表达式,并与三次抛物线法的计算结果进行对比,证明了计算假定的合理性。
Analysis of Slope Plane Position of Trapezoid Leaf of Tapered Leaf Springs;
变截面钢板弹簧梯形叶片的斜面位置分析
The paper introduces a modified trapezoid acceleration pattern with a constant speed part for loomrapier motion driven by cam.
本文提出了一种带有等速运动的改进梯形加速运动规律,用于凸轮传动的剑杆运动。
The critical water depth of open channels with trapezoid cross sections and smooth slopes is calculated with a weighted approximation method.
用两步加权迭代法计算小底坡梯形明渠的临界水深，计算简便，而精度很高：迭代两步所得结果的相对误差为１０－５数量级，迭代三步为１０－６数量级，适用范围也较宽，能满足一般水利工程的需要。
Study of supporting characteristics of arc terrace metallic support in roadway;
拱梯形金属支架的承载能力分析
In order to meet the varied requirement of roadway support,the metallic arc-terrace support is newly developed.
为适应巷道支护的多种要求,新研制开发了弧状梯形金属支架,针对其力学特征,采用曲梁力学模型进行了受力分析,求解出了最大承载能力的表达式,与梯形金属支架承载能力相比较,得到了弧状梯形金属支架的承载能力系数。
Based on the gray assembles, the trapezium gray analysis is presented, and it is applied to environmental quality assessment.
以灰色聚类为基础 ,提出了梯形灰色聚类分析法 ,并将其应用于环境质量评价之中 。
Approximate calculating definite integrals by rectangular method,trapezoidal method and parabolic method are considered under some weaker condition and best estimatons of errors are obtained.
在较弱的条件下考虑了定积分近似计算的矩形法、梯形法和抛物线法,并得到误差的最佳估计。
Besides,the trapezoidal method and parabolic method is used to make approximate calcalation and error estimate of the integral.
同时 ,用梯形法和抛物线法对此积分作了近似计算和误差估