1) flutter stability
颤振稳定性
1.
Taking the Baling River Bridge as a background,the effects of upper and lower central stabilizing barriers on the flutter stability of long-span truss girder suspension bridge with a central-slot deck have been in- vestigated by a series of wind tunnel tests of sectional model.
结果表明,在桁架加劲梁横梁上弦杆上侧设置适当高度的上中央稳定板可以较大幅度地提高桥梁的颤振临界风速,并且在常规的稳定板高度范围,颤振临界风速基本上随上稳定板高度的增加而提高;在横梁上弦杆下侧的主桁架内设置适当高度的下中央稳定板也能在一定程度上改善桥梁颤振稳定性,但效果明显不如上稳定板,在某些高度情况下甚至会降低桥梁的颤振临界风速。
2.
Taking a bay bridge with a main span 688 m as an example,this paper investigates the influence of railing curbstone structure on the flutter stability of box main girder through sectional model wind tunnel test.
以某一主跨688 m的海港大桥为例,通过节段模型风洞试验研究栏杆缘石构造对箱形主梁颤振稳定性的影响。
3.
The paper studied the flutter stability of a single-DOF linear aeroelastic system with time-delayed feedback control.
研究了单自由度线性气动弹性系统在延迟反馈控制作用下的颤振稳定性特性。
2) Chatter Stability Lobes
颤振稳定域
1.
Rapid Analysis on Chatter Stability Lobes for High Speed Milling Based on Frequency Response Function;
基于频响函数的高速铣削颤振稳定域快速分析与研究
2.
The paper analyzes the simulation technology of chatter stability lobes of milling process.
文章在分析数控加工铣削过程颤振稳定域仿真技术,介绍MATLABWebServer应用程序体系结构与开发原理的基础上,研究开发了基于Web的数控加工铣削过程颤振稳定域远程仿真系统;该系统实现了MATLAB语言与HTML语言的结合应用,为数控加工过程切削参数的合理、有效地选择提供了一种网络化远程仿真工具和方法,整个系统的主要功能在实际数控加工中得到了相应的验证。
3) flutter instability
颤振失稳
1.
For pined_pined,loosed midpoint support plate,it is found that the plate s buckling instability will happen first while the flutter instability will disappear.
发现板在两端简支、中点联结松动时 ,结构首先出现屈曲失稳 ,而不会发生颤振失稳。
2.
The wind tunnel sectional model tests reveal that the flexural galloping may occur in the hangers under small wind attack angles when the webs are not perforated while the torsional flutter instability may initiate in the hangers at low wind speed of wind attack angle round 20° when the webs are perforated.
节段模型试验发现,腹板不开孔吊杆在小攻角下可发生弯曲驰振;而腹板开孔的吊杆在20°攻角附近较低风速下可发生扭转颤振失稳,且发生扭转颤振失稳的风攻角区间受腹板开孔大小影响明显。
3.
An experimental study of flutter instability of H-shaped slender member with different sizes of slotted web is carried out using both section models and aeroelastic model.
通过节段模型与气弹模型风洞试验,研究了不同腹板开孔率的H型细长结构的风致颤振失稳特性。
4) amplitude stability
振幅稳定性
1.
Vibration amplitude stability control for an antiresonant vibrating griddle;
反共振振动筛的振幅稳定性控制
5) vibration stability
振动稳定性
1.
Study on Vibration Stability of Elastically Supported Tilting PadBearing and Rotor System;
弹性支承可倾瓦轴承-转子系统振动稳定性分析
2.
This paper studies the vibration stability of rectangular shaft on variable rotation.
本文研究了扁平轴变速回转时的振动稳定性问题。
6) polarization stability
偏振稳定性
补充资料:颤振
颤振 flutter 弹性结构在均匀气(或液)流中受到空气(或液体)动力、弹性力和惯性力的耦合作用而发生的大幅度振动。它可使飞行器结构破坏,建筑物和桥梁倒塌。发生颤振的必要条件是:结构上的瞬时流体动力与弹性位移之间有相位差,因而使振动的结构有可能从气(或液)流中吸取能量而扩大振幅。最常见的颤振发生在机翼上。当机翼受扰动向上偏离平衡位置后,弹性恢复力使它向下方平衡位置运动,同时产生作用于机翼重心的向上惯性力,因机翼重心在扭心之后,惯性力产生对扭心的力矩而使机翼迎角减小,引起向下的附加气动力,加快机翼向下运动;当机翼运动到下方极限位置而返回向上运动后,出现相反的情况。整个过程中,空气动力是激振力,与飞行速度的二次方成正比;同时还有空气对机翼的阻尼力,与飞行速度成正比。低速时,阻尼力占优势,扰动后的振动逐渐消失,平衡位置是稳定的。当飞行速度超过颤振临界速度后,激振力占优势,平衡位置失稳,产生大幅度振动,导致机翼在很短时间内破坏。防止机翼颤振的最有效方法是使机翼重心前移以减小惯性力矩。设计飞机时,要在风洞中进行模型试验以确定颤振临界速度。飞机研制成功后,还需进行飞行颤振试验。 |
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参考词条