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1)  direct damping derivative
直接阻尼导数
1.
To determine direct damping derivatives during aircraft and guided missile design and analysis,a new technique for measuring these derivatives by forced-oscillation method has been established in CG-01 wind-tunnel.
为确定飞机和导弹设计与气动分析时最常用的直接阻尼导数,CG-01风洞试验室建立了强迫振动法测量直接阻尼导数的试验技术。
2)  direct damping
直接阻尼
3)  damping derivative
阻尼导数
4)  Fractional derivative damping
分数导数型阻尼
5)  damping-in-pitch derivative
俯仰阻尼导数
1.
Through the numerical simulation of forced oscillation of liftbody by solving the (N-S) equations, the equilibrium gas effect on damping-in-pitch derivatives is investigated.
通过数值求解N-S方程,模拟升力体外形的强迫振动过程,研究了平衡气体效应对带翼飞行器俯仰阻尼导数的影响。
2.
In this paper, the supersonic damping-in-pitch derivativesof blunt body were calculated with two methods: (1) harmonic perturbationmethod by solving Euler equations; (2) simulant viscous flow field by solving unsteady N-S equations.
分别采用:(1)Euler方程的谐振摄动法;(2)薄层近似的非定常N-S方程模拟有粘扰动流场两种方法计算了钝体外形的高超声速俯仰阻尼导数。
6)  damping in roll derivatives
滚转阻尼导数
1.
In this paper, the harmonic oscillating flows were solved by unsteady Navier Stokes equations, and the calculation method of damping in roll derivatives was presented under the Etkin s theory when body oscilated around a fixed axis.
采用非定常 Navier-Stokes方程描述物体简谐振动流场 ,并在 Etkin理论下给出绕定轴转动时滚转阻尼导数的计算公式 ,定常流场的计算采用空间二阶精度的交替方向隐式分解的 NND格式 ,非定常流场的计算采用时、空二阶精度的 Runge-Kutta多步格式 ,采用代数方法生成物体静、动网格。
补充资料:单位阻尼能
分子式:
CAS号:

性质:变形周期中损失的能量与材料体积之比。亦称之为单位阻尼能。高分子材料具有黏弹性,发生变形时不是完全的弹性变形,而伴随着发生塑性变形。在发生塑性变形时,由于分子间或晶面间的滑移,摩擦生热等耗去了能量,因此不能使原加的能量完全以形变能贮存,并在恢复过程中释放。失去的那部分能量就属于能量损耗。正确了解这一点,就可以根据不同用途来进行选材,也对新材料的研究起指导作用。

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