A Parametric Study for a Structural Intensity based Damage Detection Technique

机译：基于结构强度的损伤检测技术的参数研究

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A preliminary inv :stigation to test the feasibility of a Structural Intensity (SI) based damage detection technique is presented in this paper. A parametric study was performed in order to evaluate the effects of the main structural and experimental parameters on the distribution of energy flow in a test structure. It was determined that the magnitude and the gradient of the SI field were significantly affected by the characteristic damping levels found in the test structure. In order to identify feasible ranges of interest for the different functional parameters with respect to the types of airframe applications of interest, vibration and damping measurements on a UH-60 transmission frame were obtained and the results used to guide the numerical simulations. The Total Transmitted Power is one of the main parameters used for the health assessment of the test structure. This parameter, however, is strongly affected by the damping levels which reduce the amount of power that effectively reaches an energy sink. Preliminary measurements made on a plate structure with progressively increasing damage are presented illustrating the use of SI for damage characterization. A new concept based on an Active Energy Sink is introduced in order to counterbalance the effects of the different practical structure inherent dissipative mechanisms and to maximize the Total Transmitted Power independently of the characteristics of the structure being assessed. Finally, a Nonlinear Structural Intensity technique is also suggested as a possible approach to extend the capabilities of the SI based SHM system as well as to potentially perform damage localization.

机译：本文提出了一个初步的倡议，以测试基于结构强度（SI）的损伤检测技术的可行性。为了评估主要结构和实验参数对测试结构中能量流分布的影响，进行了参数研究。可以确定，在测试结构中发现的特征阻尼水平显着影响了SI场的大小和梯度。为了针对感兴趣的机身应用类型识别不同功能参数的可行感兴趣范围，获得了UH-60传输框架上的振动和阻尼测量值，并将结果用于指导数值模拟。总发射功率是用于测试结构健康评估的主要参数之一。但是，该参数受阻尼水平的强烈影响，阻尼水平会降低有效达到能量吸收器的功率。提出了在具有逐渐增加的损伤的板结构上进行的初步测量，说明了使用SI进行损伤表征。为了抵消不同实际结构固有的耗散机制的影响，并使与所评估结构的特性无关的总发射功率最大化，引入了一种基于有源能量吸收器的新概念。最后，还提出了一种非线性结构强度技术，作为扩展基于SI的SHM系统功能以及潜在地进行损伤定位的一种可能方法。

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来源
《AHS international condition-Based maintenance specialists meeting 2009》|2009年|79-94|共16页
会议地点 Huntsville AL(US)
作者
Fabio Semperlotti; Walter T. Schmidt; Edward C. Smith; Stephen C. Conlon; Jeffrey C. Banks;
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The Pennsylvania State University State College, PA;

The Pennsylvania State University State College, PA;

The Pennsylvania State University State College, PA;

Applied Research Laboratory The Pennsylvania State University State College, PA;

Applied Research Laboratory The Pennsylvania State University State College, PA;

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原文格式 PDF
正文语种 eng
中图分类 V275.1;
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4. A Parametric Study for a Structural Intensity based Damage Detection Technique [C] . Fabio Semperlotti, Walter T. Schmidt, Edward C. Smith, AHS international condition-Based maintenance specialists meeting . 2009

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A Parametric Study for a Structural Intensity based Damage Detection Technique

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