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Dynamic Design Tools For Understanding and Exploiting Nonlinearity in Structures

用于理解和利用结构非线性的动态设计工具

基本信息

批准号：
EP/K005375/1
负责人：
Simon Neild
金额：
$ 95.47万
依托单位：
University of Bristol
依托单位国家：
英国
项目类别：
Fellowship
财政年份：
2013
资助国家：
英国
起止时间：
2013 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FK005375%2F1
关键词：
Dynamic Design Tools Understanding Exploiting

项目摘要

The dynamic behaviour of mechanical systems and structures is often critical to their performance. Examples where unpredicted dynamic behaviour has resulted in poor performance include the London Millennium Footbridge prior to retrofitting with dampers and wheel shimmy experienced in aircraft landing gear and motorbikes. When structures remain in their linear operating region, where the response is proportional to the size of the force causing it, there are well-established modelling and experimental validation tools for analysing their dynamic behaviour. If the structure exceeds the linear operating region and starts to exhibit nonlinear behaviour, for example due to large deflections, the effectiveness of these tools rapidly reduces leading to high degrees of design uncertainty. This uncertainty leads to multiple design iterations and increased costly experimental validation and even the discovery of undesirable behaviour late in the design process resulting in significant delay and additional expense. This presents a problem when trying to innovate to improve performance, for example by reducing weight or using new materials, as this tends to add nonlinear effects. Currently the consequence of the limitations in existing tools is that the resulting uncertainty is compensated for by conservative design. What are urgently needed are design tools that can cope with complex nonlinear behaviour. The new nonlinear design tools this research will provide will greatly reduced the costs associated with designing new high performance products. Such step changes to the UK's capability for advanced design will assist high-end manufacturing industry to maintain its competitive edge.

机械系统和结构的动态行为往往对其性能至关重要。不可预测的动态行为导致性能不佳的例子包括伦敦千禧人行桥，在加装阻尼器之前，飞机起落架和摩托车经历了车轮摆振。当结构保持在其线性工作区域时，响应与引起响应的力的大小成比例，有完善的建模和实验验证工具用于分析其动态行为。如果结构超过线性工作区域，并开始表现出非线性行为，例如由于大的挠度，这些工具的有效性迅速降低，导致高度的设计不确定性。这种不确定性导致多次设计迭代和增加昂贵的实验验证，甚至在设计过程后期发现不期望的行为，导致显著的延迟和额外的费用。当试图通过创新来提高性能时，例如通过减轻重量或使用新材料，这会带来一个问题，因为这往往会增加非线性效应。目前，现有工具的局限性的后果是，由此产生的不确定性是由保守的设计补偿。我们迫切需要的是能够科普复杂非线性行为的设计工具。这项研究将提供新的非线性设计工具，将大大降低与设计新的高性能产品相关的成本。英国先进设计能力的这种阶段性变化将有助于高端制造业保持其竞争优势。