Dynamic interface analysis

这一正在进行的研究计划的目的是开发方法学和基于模拟的工具，以研究在规定的确定性和伪随机运动环境中运行的动态系统的行为。特别关注两个具有代表性的系统：直升机/舰船动态界面和人体姿态稳定性。在这项赠款申请所涉期间，计划实现三个短期目标。(1)直升机/舰船系统的计算模型将与海况天气模型和伪随机船舶运动生成方法一起改进和集成到通用的蒙特卡罗模拟中，以便基于风险的概率方法可以用来发现与界面载荷谱相关的难以捉摸的细节。载荷谱将有效地量化生命周期界面载荷、超过各种设计峰值的概率和疲劳载荷极限，并允许平台运动和界面力之间的频域关联。(2)旋翼叶片航行，即由于船舶运动和非定常空气动力导致的低转速下叶片大变形的现象，将继续通过计算和实验研究，以发现各种条件如何影响叶片航行，以及使用主动控制的智能材料可以在多大程度上减弱这种现象。刚性段和连续梁建模方法都用于提供精确的、计算效率高的解，非常适合于参数研究。(3)姿势稳定性研究将继续发展人体在运动基础上的关节动力学模型，以确定模型复杂性与保真度之间的关系，并利用结果建立准确的运动诱导中断模型。如果可能，将在规定的运动界面问题的背景下考虑和概括来自这些相关项目的推论。

The purpose of this on-going research program is to develop methodology and simulation-based tools for investigating the behaviour of dynamic systems operating in prescribed deterministic and pseudo-random motion environments. Attention is specifically focused on two representative systems: the helicopter/ship dynamic interface and human postural stability. Three short-term objectives are planned for the period covered by this grant application. (1) A computational model of a helicopter/ship system will be refined and integrated, along with a sea state weather model and pseudo-random ship motion generation approach, into a versatile Monte Carlo simulation such that risk-based probabilistic methodology can be used to discover elusive details relating to interface load spectra. The load spectra will effectively quantify life cycle interface loading, probability of exceeding various design peak and fatigue load limits, and allow frequency-domain correlations between platform motions and interface forces. (2) Rotor blade sailing, the phenomenon of large blade deflections occurring at low rotational speeds as the result of ship motion and unsteady aerodynamics, will continue to be investigated computationally and experimentally to discover how various conditions affect blade sailing and the extent to which the phenomenon can be attenuated using actively-controlled smart materials. Both rigid-segment and continuous beam modelling approaches are used to provide accurate computationally-efficient solutions well suited for parametric studies. (3) Postural stability research will continue to develop articulated dynamic models of humans on moving bases to determine the relationship between model complexity and fidelity and use the results to establish an accurate motion-induced interruption model. Inferences from these interrelated projects will be considered and generalized if possible in the context of the prescribed motion interface problem.