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High speed parameter estimation for a homogenized energy model.

机译:均质能量模型的高速参数估计。

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摘要

Industrial, commercial, military, biomedical, and civilian uses of smart materials are increasingly investigated for high performance applications. These compounds couple applied field or thermal energy to mechanical forces that are generated within the material. The devices utilizing these compounds are often much smaller than their traditional counterparts and provide greater design capabilities and energy efficiency.;The relations that couple field and mechanical energies are often hysteretic and nonlinear. To accurately control devices employing these compounds, models must quantify these effects. Further, since these compounds exhibit environment-dependent behavior, the models must be robust for accurate actuator quantification.;In this dissertation, we investigate the construction of models that characterize these internal mechanisms and that manifest themselves in material deformation in a hysteretic fashion. Results of previously-presented model formulations are given. New techniques for generating model components are presented which reduce the computational load for parameter estimations. The use of various deterministic and stochastic search algorithms for parameter estimation are discussed with strengths and weaknesses of each examined. New end-user graphical tools for properly initiating the parameter estimation are also presented. Finally, results from model fits to data from ferroelectric---e.g., Lead Zirconate Titanate (PZT)---and ferromagnetic---e.g., Terfenol-D---materials are presented.
机译:越来越多的研究将智能材料用于工业,商业,军事,生物医学和民用领域,以用于高性能应用。这些化合物将施加的场能或热能与材料内部产生的机械力耦合。使用这些化合物的设备通常比传统设备小得多,并提供更高的设计能力和能效。耦合场能和机械能的关系通常是迟滞性和非线性的。为了精确控制使用这些化合物的设备,模型必须量化这些影响。此外,由于这些化合物表现出与环境有关的行为,因此对于精确的致动器定量分析,模型必须具有鲁棒性。在本论文中,我们研究了表征这些内部机理并以滞后方式表现出材料变形的模型。给出了先前提出的模型公式的结果。提出了用于生成模型组件的新技术,该技术减少了参数估计的计算量。讨论了各种确定性和随机搜索算法用于参数估计的情况,并讨论了每种方法的优缺点。还介绍了用于正确启动参数估计的新的最终用户图形工具。最后,给出了模型拟合结果的结果,这些模型拟合结果来自铁电材料(例如锆钛酸铅(PZT))和铁磁材料(例如Terfenol-D)的数据。

著录项

  • 作者

    Ernstberger, Jon M.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Mathematics.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 124 p.
  • 总页数 124
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 数学;工程材料学;
  • 关键词

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