arch n. 1.【建筑】弓架结构;拱廊;拱门;弓形门;穹窿,拱洞,拱顶。 2.弓形,半圆形。 a memorial arch 纪念门,牌坊。 a triumphal arch 凯旋门。 arch of the foot 足底弓。 the arch of the heavens 苍穹。 the Court of Arches (坎特伯雷的)宗教裁判上诉院。 vi. 1.【建筑】作(成)拱。 2.成弓形,弓着。 vt. 1.【建筑】把…作成拱形;使弯作弓形。 2.用拱连接,用拱覆盖。 The rainbow arches the heaven. 虹在天上成弓形。 A cat arches its back. 猫弓着背。 adj. 首要的;总的。 the arch villain 流氓头子。 adj. 诡诈的;淘气的。 an arch smile 顽皮的微笑。
According to the geometrical characteristic of the arch dam shape, and based on the parameter design language of ansys software ( apdl ), the subp method and the stochastic search method are adopted together to optimize design of hyperbolic arch dam with variable thicknesses of the circle 摘要根据拱坝体形的几何特征,基于ansys软件的参数化设计语言(apdl),将零阶近似方法和随机搜索法结合起来对单圆心变厚度双曲拱坝进行了优化设计。
A new waveguide made of changing a wide wall of a rectangular waveguide to a uniform curved wall is called conformal waveguide . a kind of expression of approximate solution for domain mode of the new waveguide, including symmetric, unsymmetric arc, parabolic arch, hyperbolic arch, elliptic arch, etc ., is constructed by using boundary condition of mental waveguide, variational method and boundary element method . by using the equivalence principle, an approximate calculating formula for equivalent resonant conductance of a narrow longitudinal halfwavelength slot cut in the curved wall of the unsymmetric arcrectangular waveguide is derived, and the result is shown . although this solution is approximate, it can solve the problem in designing the slotted antenna of such conformal waveguide 把矩形波导一个宽面外突成均匀曲面构成的新波导统称为共形波导.利用金属波导边界条件、变分法、边界元素法构造这种新波导中主模场的一种近似解表达式,包括曲面横截线为对称、非对称圆弧,抛物线弧,双曲线弧,椭圆弧等.然后根据等效原理,推导非对称圆弧矩形波导曲面上窄的纵向半波长缝隙的等效谐振电导的近似计算公式,给出计算曲线.这种解虽然是近似的,但却能解决这类共形波导缝隙天线的工程设计