Dynamic Stability of Axially Moving Viscoelastic Beams With Pulsating Speed
-
摘要: 研究速度变化的轴向运动粘弹性梁在亚谐波共振及组合共振范围内的参数振动．通过平均法，在运动参数激励频率为2倍固有频率或为两阶固有频率之和附近时得到了自治的常微分方程组．在参数激励频率和激励振幅平面上，可以找到由于共振而产生的失稳区域，并应用数值方法验证了理论推导结果的正确性．分析了粘弹性阻尼，速度和预紧张力对失稳区域的影响．粘弹性阻尼使得共振失稳区域减小，而速度和预紧张力使共振失稳区域在频率-振幅平面上发生漂移．Abstract: Parametric vibration of an axially moving, elastic, tensioned beam with pulsating speed was investigated in the vicinity of subharmonic and combination resonance. The method of averaging was used to yield a set of autonomous equations when the parametric excitation frequency is twice or the combination of the natural frequencies. Instability boundaries were presented in the plane of parametric frequency and amplitude. The analytical results were numerically verified. The effects of the viscoelastic damping, steady speed and tension on the instability boundaries were numerically demonstrated. It's found that the viscoelastic damping decreases the instability regions and the steady speed and the tension make the instability region drift along the frequency axis.
-
Key words:
- subharmonic resonance /
- averaging method /
- stability of vibration /
- axially moving beam
-
[1] Wickert J A,Mote C D Jr. Current research on the vibration and stability of axially moving materials[J].The Shock and Vibration Digest,1988,20(5):3—13. [2] Wickert J A,Mote C D Jr.Classical vibration analysis of axially moving continua[J].ASME Journal of Applied Mechanics,1990,57(Sep):267—284. [3] Pellicano F,Vestroni F.Nonlinear dynamics and bifurcations of an axially moving beam[J].ASME Journal of Vibration and Acoustics,2000,122(1):21—30. doi: 10.1115/1.568433 [4] Asokanthan S F,Ariartnam S T.Flexural instabilities in axially moving bands[J].ASME Journal of Vibration and Acoustics,1994,116(3):275—279. doi: 10.1115/1.2930425 [5] ?z H R,Pakdemirli M,Oezkaya E.Transition behaviour from string to beam for an axially accelerating material[J].Journal of Sound and Vibration,1998，215(3)：571—576. doi: 10.1006/jsvi.1998.1572 [6] ?z H R,Pakdemirli M.Vibrations of an axially moving beam with time dependent velocity[J].Journal of Sound and Vibration,1999,227(2):239—257. doi: 10.1006/jsvi.1999.2247 [7] ?zkaya E, Pakdemirli M. Vibrations of an axially accelerating beam with small flexural stiffness[J].Journal of Sound and Vibration,2000,234(3):521—535. doi: 10.1006/jsvi.2000.2890 [8] ?z H R. On the vibrations of an axially traveling beam on fixed supports with variable velocity[J].Journal of Sound and Vibration,2001,239(3):556—564. doi: 10.1006/jsvi.2000.3077 [9] Ariaratnam S T, Namchchivaya N Sri.Dynamic stability of pipes conveying pulsating fluid[J].Journal of Sound and Vibration,1986,107(2):215—230. doi: 10.1016/0022-460X(86)90233-6 -
计量
- 文章访问数: 2792
- HTML全文浏览量: 228
- PDF下载量: 566
- 被引次数: 0
下载:
渝公网安备50010802005915号