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The role of rate dependence and dissipation in the constitutive behavior of ferroelectric ceramics for high power applications.

机译：速率依赖性和耗散在高功率应用的铁电陶瓷本构行为中的作用。

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摘要

In the aerospace industry, structural control such as flap and aileron actuation is achieved through hydraulic actuation systems. Conventional hydraulic systems are large, heavy, require heat exchangers and require hydraulic lines be run throughout the aircraft. Northrop-Grumman, under the DARPA funded Smart Wing program, funded Georgia Tech to develop a piezohydraulic pump. The piezohydraulic pump allows compact construction; hence, individual pumps may be distributed throughout the aircraft in lieu of hydraulic lines, central pumps, and heat exchangers.; To achieve high output power the piezoelectric in the pump application was driven at high electric field and high frequency. As a result, it was driven into the non-linear irreversible response regime. The resulting hysteresis lead to self-heating and limited pump drive frequency to 60Hz. Constitutive laws are not available to predict the generation of heat, the minor hysteresis loops, and the saturation of the piezoelectric response at high field.; The purpose of the following work was to bridge the gap between engineering applications and engineering science in the field of high drive ferroelectric actuation. A piezohydraulic pump capable of large force-large displacement was constructed. This self-heating design problem motivated the development of improved constitutive models. Two computational polycrystalline models have been developed. The first captures high-field and thermal effects; the second captures rate and self-heating effects. Hence, both the details of pump development and performance are presented, as well as details of constitutive modeling of the irreversible, rate dependent behavior driving self-heating.
机译：在航空航天工业中，通过液压致动系统实现襟翼和副翼致动等结构控制。传统的液压系统又大又重，需要热交换器，并且要求液压线贯穿整个飞机。诺斯罗普·格鲁曼公司（Northrop-Grumman）在DARPA资助的Smart Wing计划的资助下，向佐治亚理工大学资助开发了一种压电液压泵。压电液压泵结构紧凑。因此，可以代替液压管路，中央泵和热交换器在整个飞机上分配单独的泵。为了获得高输出功率，在高电场和高频率下驱动泵中的压电材料。结果，它被驱动到非线性不可逆响应机制中。产生的磁滞导致自热，并将泵驱动频率限制为60Hz。本构定律不能用来预测热量的产生，较小的磁滞回线以及高电场下压电响应的饱和度。以下工作的目的是弥合高驱动铁电致动领域的工程应用与工程科学之间的鸿沟。构造了一种具有大力大位移的压电液压泵。这种自热设计问题促使开发了改进的本构模型。已经开发了两个计算多晶模型。第一个捕捉高场效应和热效应；第二个捕获速率和自热效应。因此，将介绍泵的开发和性能的详细信息，以及不可逆的，速率相关行为驱动自热的本构模型的详细信息。

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  • 作者

    Mauck, Lisa D.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 245 p.
  • 总页数 245
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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