颤振失稳,flutter instability
1)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 theflutter 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 torsionalflutter 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 offlutter 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。
2)stall flutter失速颤振
1.Thestall flutter characters of high-aspect-ratio composite wing are investigated, and the effects of structure geometric nonlinearity and stiffness couple created by composite anisotropy on them also are discussed.研究了大展弦比复合材料机翼在较大迎角状态下的失速颤振特性,探讨了结构几何非线性和由复合材料剪裁产生的刚度耦合效果对机翼失速颤振特性的影响。
英文短句/例句
1.Analysis of the stall flutter and results are emphasized.文中着重对失速颤振现象及结果作了分析。
2.Secondary Instability Flutter of Heated Panels in Supersonic Airflow超声速气流中受热壁板的二次失稳型颤振
3.Supersonic Nonlinear Fluutre Analysis of Dualistic Airfoil;超音速流中二元机翼非线性颤振研究
4.The Flutter Study of Supersonic Wing-Body Combination超音速飞行器翼—身组合体的颤振研究
5.Front-wheel shimmy (low speed ) . Low-speed shimmy is the rapid oscillation of the wheel on the Ball joints.前轮摆振(低速时):低速摆振是球头节上车轮急速颤动所至。
6.Aerodynamic Flutter and Limited Cycle of a 2-D Wing in the Hypersonic/Supersonic Flow Field超声速/高超声速流中二元机翼的颤振与极限环
7.Transonic Unsteady Aerodynamics and Flutter Computations for Complex Assemblies;复杂组合体跨音速非定常气动力和颤振计算
plicated Responses of Supersonic Flutter System with Structural Nonlinearities;结构非线性超音速颤振系统的复杂响应研究
9.Aerodynamic flutter and limited cycle of a 2-D wing in the supersonic flow field超音速流中二元机翼的气动颤振与极限环
10.Flutter Prediction Based on Multiplicative Perturbation to Dynamic Pressure采用乘性速压摄动的频域颤振预测方法
11.Hypersonic Airfoil Flutter Analysis with Hysteretic Nonlinearities具有迟滞非线性的高超声速机翼颤振分析
12.Floating suspension system for full model flutter test in transonic wind tunnel跨声速风洞全模颤振试验悬浮支撑系统
13.Filtering in Time-Frequency Domain for Measurement of Accelerometer in Flight Flutter Testing颤振试验中加速度计信号的时频滤波方法研究
14.Research of data process methods and model excitation for transonic flutter experiments in wind tunnel跨声速风洞颤振试验模型激振与数据处理方法研究
15.A tremulous or pulsating effect produced in an instrumental or vocal tone by barely perceptible minute and rapid variations in pitch.颤音一种颤动或振动效果，由可察觉的微小迅速的音阶变化在声音或乐器的调子中产生的
16.LOCAL BIFURCATIONS AND SOME GLOBAL BEHAVIOR IN A SUPERSONIC PANEL FLUTTER PROBLEM超音速板颤振问题中的局部分岔现象及某些全局行为
17.Study on Flutter and Aerodynamic Control Measures of Long-Span Suspension Bridges;大跨悬索桥颤振及提高临界风速的气动措施研究
18.Reliability and Sensitivity Analysis of Transonic Flutter Using Improved Line Sampling Technique跨声速机翼颤振问题的改进线抽样可靠性及灵敏度分析(英文)
相关短句/例句
stall flutter失速颤振
1.Thestall flutter characters of high-aspect-ratio composite wing are investigated, and the effects of structure geometric nonlinearity and stiffness couple created by composite anisotropy on them also are discussed.研究了大展弦比复合材料机翼在较大迎角状态下的失速颤振特性,探讨了结构几何非线性和由复合材料剪裁产生的刚度耦合效果对机翼失速颤振特性的影响。
3)Chatter Stability Lobes颤振稳定域
1.Rapid Analysis onChatter 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。
4)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 theflutter 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 theflutter 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 theflutter 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。
5)dynamic instability and vibration失稳振荡
6)Unstable vibration失稳振动
1.On the basis of establishing the model of the system containing both support damping and rotor external damping, the film unstable vibrations of the system are calculated by the use of nonlinear method, then the methods and the concrete measures of narrowing unstable region are dealt with ,thus proving that the width and the amplitude of the unstable region is limited.在建立包含支承阻尼和转子外阻尼在内的弹性支承滑动轴承系统模型的基础上，用非线性方法计算了该系统的油膜失稳振动，讨论了缩小失稳区的方法和具体措施。
延伸阅读
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。
