共查询到20条相似文献,搜索用时 484 毫秒
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振动弦的“色散”实验研究 总被引:1,自引:1,他引:0
研究了有界弦横向强迫振动时弦上波速的色散现象.实验测量结果表明:由弦的张力和线密度决定的弦上的波速(T/ρ)~1/2不一定是常量,在一定的条件下,弦的波速会随着弦驻波的波长长度(弦长)改变而变化. 相似文献
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根据力学系统与电学系统物理量间的对应关系,提出了用电路定律处理线性离散系统谐强迫振动的方法。 相似文献
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再论用Laplace变换法求解端点系有集中质量的弹性杆的振动问题 总被引:3,自引:0,他引:3
将作者在《大学物理》2004年第12期上的一篇文章的解法推广到弹性杆的强迫纵振动问题,并求解了两端系有集中质量的弹性杆的自由纵振动问题. 相似文献
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金属和压电陶瓷构成的两层复合薄圆板的强迫振动 总被引:9,自引:0,他引:9
本文分析了电压策动或均匀声压策动下的由半径不同的压电陶瓷和金属板构成的两层复合薄圆板的强迫振动。给出了简支边界条件和固定边界条件下的严格解和串联共振频率方程与并联共振频率方程。用Rayleigh-Ritz方法给出了简支边界条件下电压策动的强迫振动的近似解和串联共振频率方程。数字结果给出了能得到较大机电耦合系数的无量纲几何参量的最佳值。本文还讨论了弹性耦合和惯性耦合对共振频率的影响。 相似文献
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在强迫振动模式下,系统地测量了Mn-8wt%Cu合金热弹性马氏体相变过程中的内耗对变温速率和振动频率的依赖关系.通过单独拟合相变内耗对振动频率和变温速率的依赖关系,提出了一种新的实验关系,并结合实验结果,讨论了非线性相变内耗的机制.
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为了对油底壳的改进方案进行噪声预测,首先建立油底壳的流固耦合有限元模型,进行耦合模态计算,获得其固有频率和振型,通过模态试验验证了耦合有限元模型的准确性;其次,在发动机工作过程中,通过试验测得油底壳各螺栓固定处的振动加速度;再次,基于模态结果,在油底壳各螺栓固定处施加测试的振动加速度,采用有限元的分析方法对油底壳进行了强迫振动计算和辐射噪声计算,并进行了试验对比,结果表明该方法可用于发动机开发试验确认阶段,对油底壳改进方案进行振动噪声的预测,减小开发风险;最后,对含油量多少对辐射噪声的影响进行了对比分析。 相似文献
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The periodically forced spatially extended Brusselator is investigated in the chaotic regime. We explore resonant or non-resonant patterns generated under various forcing frequencies and forcing amplitudes. Resonant spatially uniform oscillation and irregular structures are found. Furthermore two types of regular spatial patterns are generated under appropriate parameters. Our results of numerical simulations demonstrate that periodic force can give rise to resonant patterns in forced systems of spatiotemporal chaos similar to the situation of forced systems of regular oscillations. 相似文献
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An analysis is presented which has been used to predict the unsteady aerodynamic behavior of a finite supersonic cascade of airfoils forced in harmonic oscillation with airfoil-to-airfoil variations in amplitude. Theoretical predictions are compared with some recent experimental results2 at a reduced frequency representative of actual fan or compressor flutter cases. The similarity of the experimental situation in the finite cascade to the flutter of a severely mistuned rotor is noted. 相似文献
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非线性系统受迫振动的周期解 总被引:1,自引:1,他引:0
理论上采用近似法求解,并用数学软件作图,分析和讨论了单摆自由振动的非等时性以及非线性受迫振动周期解与线性受迫振动稳态解的重要差别. 相似文献
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Giuseppe Gaeta 《International Journal of Theoretical Physics》1992,31(2):221-228
We show that forced periodic oscillations in a nonlinear damped oscillator can be classified by means of the Jones (knot) polynomial; this is done by associating to any periodic oscillation a braid. We also discuss the relation of this approach to (Lie-point) symmetry analysis of the associated differential equations. 相似文献
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WANG Bi-zheng 《理论物理通讯》1982,1(2):165-176
We considered the nuclear density oscillation in the picnic atom. It has been found that the density oscillation has no effect on the eigenvalue owing to the electromagnetic interaction between the pion and nucleus. However, the energy shifts due to the strong interaction, depend on the oscillation parmeters of the nuclei. We have taken the oscillation parameters which are compared with theoretical calculation, and obtained better calculation,results of the strong interraction energy shiftsin the pionic atom as compared with experimental ones. 相似文献
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利用DISLab实验系统中的位移传感器,改进基于弹簧振子的受迫振动实验仪,实时观察振子和驱动装置的运动情况,取得了清晰的实验图像和数据,受迫振动的物理意义更加清楚。 相似文献
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This paper reports results of wind tunnel experiments on the aeroelastic instability in a torsional mode of two-dimensional rectangular cylinders in a uniform, transverse, two-dimensional flow. Both the free oscillation method and the forced oscillation method were employed for the experiments. Emphasis has been placed on finding the effect of the chord to thickness ratio , and also that of the structural damping, on the aeroelastic instability phenomena in the vicinity of the resonance speed. 相似文献