limiting adj. 限制(性)的,有限制力的,起限定作用的〔不涉及性質(zhì)的各種定語如: several, four 等〕。
velocity n. 1.迅速;快速。 2.速度,速率。 3.周轉率。 at a velocity of 100 miles per hour 用每小時一百英里的速度。 dart off with the velocity of a bird 像鳥一樣迅速飛跑過去。 drag-free velocity無阻力飛速,真空飛速。 escape velocity(克服地球引力的)第二宇宙速度,逃逸速度。 final velocity (發(fā)射物的)終速。 initial [muzzle] velocity(發(fā)射物的)初速[腔口速度]。 uniform [variable] velocity勻[變]速。
Method of designing the delayed limit velocity for mine hoist 礦井提升機延遲式保護速度設計方法
The balance value has the function of limiting velocity and guaranteeing safety , and can make the action of hydraulic machine calm 平衡閥具有限速與安全的作用,能使液壓機械動作平穩(wěn)。
With the material dynamic constitutive equation including damage and the effect of stain rate the predictable formula about ballistic limit velocity of fiber composite target . secondly based on the damage feature about ceramic / fiber composite target caused by impact load , analysis model about defense performance of ceramic / composite material target is formed and the predictable formula about ballistic limit velocity is also given . lastly using the reflection and projectile theory of stress wave the paper discusses the design of ceramic / composite material target , optimizes the design of double layer ceramic / composite targets , gains optimal coefficient under certain area density and discusses the variety relationship of area density and thickness with optimal coefficient u nder some ballistic limit velocity 3 首先,分析了纖維類正交鋪層復合靶板在沖擊載荷作用下的損傷破壞機理,結合包含損傷和應變率效應的材料動態(tài)本構方程,建立了纖維復合材料板彈道極限速度的預測公式;其次,根據(jù)陶瓷/纖維材料復合靶板在沖擊載荷下的破壞特點,建立了陶瓷/復合材料靶板抗彈性能分析模型,給出了彈道極限速度預測公式;最后,利用應力波反射和透射理論討論了陶瓷/復合材料靶板的設計問題,對雙層陶瓷復合靶板的優(yōu)化設計進行了分析,給出了在一定面密度下的最佳優(yōu)化系數(shù),討論了一定彈道極限速度下的面密度和厚度隨優(yōu)化系數(shù)的變化關系。
They are applied to different situations and verified by experiments . analysis model of small ap oblique penetrating ceramic / metal light armor is established on the basis of energy model and the assumption of ellipse absorbing the same energy in back plate , giving the predictable formula about ballistic limit velocity . with energy model the optimization design in relation to ceramic / metal light armor is analyzed and the optimal coefficient of ceramic / metal composite armor is gained 本文的主要研究內(nèi)容如下: (一)建立了小型穿甲彈垂直侵徹陶瓷/金屬輕型裝甲的動量模型和能量模型,它們分別適用不同情況,并通過試驗驗證;基于能量模型和背板橢圓吸能相同假設,建立了小型穿甲彈斜侵徹陶瓷/金屬輕型裝甲的分析模型,給出了彈道極限速度預測公式;利用能量模型對陶瓷/金屬輕型裝甲的優(yōu)化設計進行了分析,給出了陶瓷/金屬復合裝甲的最佳優(yōu)化系數(shù)。