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Active control of far-field sound power produced by vibrating structures using direct distributed sensing of acoustic radiation modes

使用声辐射模式的直接分布式传感对振动结构产生的远场声功率进行主动控制

基本信息

批准号：
1721765
负责人：
金额：
--
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1721765
关键词：
Active control far field sound

项目摘要

Working machinery is a major source of vibration in marine vessels and considerable effort is devoted to developing isolation systems that reduce transmission to the hull. This is partly for improving crew and passenger comfort but, in the case of Naval vessels, it is primarily to suppress the associated acoustic noise and hence reduce the vulnerability to detection by acoustic mines or passive sonar. A particular problem associated with machinery isolation in marine environments is structural resonance. This occurs both in the machinery support structure and in the hull. Such resonance leads to very high forces transmitted across machinery mounts and where resonant frequencies coincide with structural modes of the hull that have high acoustic radiation efficiency, this poses a very significant problem. Although BAE Systems patented Selective Damping technology has been shown to be a highly effective control approach, it is important that new efficient distributed sensor arrays are developed that provide direct information relating to radiated sound power at the fluid/hull interface in order to minimise cost, power and weight. Moreover a significant contribution to internal and radiated noise in maritime vessels often arises from the excitation of lightly damped panels. Although passive-damping treatments can sometimes provide an effective solution, for many cases the performance can also be limited. This can be due to: Insufficient damping at low frequency due to practical weight/size constraints. Acoustic radiation associated with non-resonant forced motion (machinery casing, for example). Limited options in flood spaces.As a result an alternative and more widely applicable approach is required that will provide a broadband control capability within a lightweight panel structure. This proposal is for a PhD programme that will address both the requirements described above through the development of a smart multifunctional composite panel (or tile} that incorporates active, semi-active and passive elements within a layered structure.

工作机械是海洋船舶中的主要振动源，并且相当大的努力致力于开发减少传递到船体的隔振系统。这在一定程度上是为了提高船员和乘客的舒适度，但在海军船只的情况下，主要是为了抑制相关的声学噪声，从而减少被声学水雷或被动声纳探测到的脆弱性。与海洋环境中的机械隔离相关联的特定问题是结构共振。这在机械支撑结构和船体中都发生。这种共振导致非常高的力穿过机械安装件传递，并且其中共振频率与具有高的声辐射效率的船体的结构模式一致，这造成了非常严重的问题。虽然BAE系统公司的专利选择性阻尼技术已被证明是一种非常有效的控制方法，但重要的是，开发新的高效分布式传感器阵列，提供与流体/船体界面处的辐射声功率相关的直接信息，以最大限度地降低成本、功率和重量。此外，对船舶内部噪声和辐射噪声的重要贡献通常来自于轻阻尼板的激励。虽然被动阻尼处理有时可以提供有效的解决方案，但在许多情况下，性能也可能受到限制。这可能是由于：由于实际的重量/尺寸限制，低频时阻尼不足。与非共振强迫运动相关的声辐射（例如，机器外壳）。洪水空间的选择有限。因此，需要一种替代的、更广泛适用的方法，在轻质板结构中提供宽带控制能力。该提案是一个博士课程，将通过开发一种智能多功能复合板（或瓷砖）来满足上述要求，该复合板将有源，半有源和无源元件集成在分层结构中。