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首页> 外文会议>Cranfield Conference on Dynamica and Control of Systems and Structures in Space; 2004; Liguria; IT >Numerical and Experimental Results of Passive Control for Noise and Vibration Reduction
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Numerical and Experimental Results of Passive Control for Noise and Vibration Reduction

机译：被动控制降噪和减振的数值和实验结果

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During last years many research projects have been funded by European and American Institutions with the aim to increase passengers' acoustical and vibrational comfort, in aerospace as well as in automotive field. In order to control noise radiated and vibration levels in vehicles and structures, different approaches have been used. Hybrid active-passive damping treatments seem to be the most effective by combining robustness and reliability of passive methods with high performance of active ones. Experiences gained on using passive damping treatments, mainly on 2-D structures, have been used for studying typical truss space structures and assessing the ability of damping treatments to reduce structural vibrations. In addition, the temperature sensitivity of viscoelastic damping materials has been experimentally measured and its effect simulated in numerical models. The paper presents the characteristics of viscoelastic damping materials within "glassy" and "rubbery" behaviour's typical temperature, and discusses the possibility to use them, in a numerical model, for simulating damping treatment's effect in operating conditions on dynamic response of a truss structure. The results obtained during these preliminary studies are quite discouraging leading to the conclusion of the inefficient use of such damping treatments for truss-like structures. Completely different results are obtained, on the other hand, when using active control approach, which may be even technologically more efficient, for such kind of structures. As a final results a sort of hybrid truss-panel structure has been studied which may offer an alternative approach to reduce the vibrations of such typical structural architecture.
机译：在过去的几年中，许多研究项目得到了欧美机构的资助，目的是在航空航天和汽车领域中提高乘客的声学和振动舒适度。为了控制车辆和建筑物中的辐射噪声和振动水平，已使用了不同的方法。通过将被动方法的鲁棒性和可靠性与主动方法的高性能相结合，混合主动-被动阻尼处理似乎是最有效的。使用被动阻尼处理（主要是在二维结构上）获得的经验已用于研究典型的桁架空间结构并评估阻尼处理降低结构振动的能力。另外，已经对粘弹性阻尼材料的温度敏感性进行了实验测量，并在数值模型中模拟了其影响。本文介绍了“玻璃状”和“橡胶状”行为典型温度范围内的粘弹性阻尼材料的特性，并讨论了在数值模型中使用它们来模拟阻尼处理在工作条件下对桁架结构动力响应的影响的可能性。在这些初步研究中获得的结果令人非常沮丧，导致无法得出这样的结论：对桁架状结构进行此类阻尼处理效率低下。另一方面，当使用主动控制方法时，可以获得完全不同的结果，对于这种类型的结构，在技术上甚至可能更加有效。作为最终结果，已经研究了一种混合式桁架-面板结构，该结构可为减少这种典型结构的振动提供替代方法。

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