Device for the measurement of non-periodic and non-linear structural vibrations

用于测量非周期和非线性结构振动的装置

• 批准号: 495957501
• 金额: --
• 依托单位: Universität Stuttgart
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/495957501?language=en
• 关键词: Device; measurement; non; periodic; linear

The research focus of the Structural Mechanics Group of the Institute of Aircraft Propulsion Systems is on nonlinear structural vibrations. Central topics are the development of methods for nonlinear experimental modal analysis, the dynamics of turbomachinery blades subjected to frictional contacts impact, and vibration mitigation using impact absorbers. The large-scale equipment applied for closes an important gap in the existing possibilities for the measurement of structural vibrations in order to address current research questions in these areas. An essential feature is that the structural vibrations are measured without contact and simultaneously at several measurement points. The non-contact acquisition avoids the distortion of the dynamics by sensors attached to the structure, especially for thin-walled structures and and structures subjected to fluid flow. The simultaneous acquisition allows the study of the often non-periodic or transient nonlinear energy transfer within mechanical systems. The instrument provides highly accurate, three-dimensional information as required, starting from small amplitudes where sufficiently linear behavior is present, up to large amplitudes where nonlinear phenomena occur. The instrument covers a wide frequency band in order to be able to investigate higher vibration modes as well as to observe the energy transfer between low and high frequencies typical of nonlinear and impact processes. The accessories enable precise alignment of the measurement points and ensure good repeatability of the experiments by means of an automatic modal hammer.

飞机推进系统研究所结构力学组的研究重点是非线性结构振动。中心议题是非线性实验模态分析方法的发展，受到摩擦接触冲击的涡轮叶片的动力学，以及使用冲击吸收器减轻振动。应用的大型设备填补了结构振动测量现有可能性的一个重要空白，以解决这些领域目前的研究问题。一个重要的特点是结构振动测量无接触，同时在几个测量点。非接触式采集避免了由附接到结构的传感器引起的动态失真，特别是对于薄壁结构和经受流体流动的结构。同时采集允许研究机械系统内的非周期性或瞬态非线性能量传递。该仪器根据需要提供高度精确的三维信息，从存在足够线性行为的小振幅开始，直到发生非线性现象的大振幅。该仪器覆盖了宽频带，以便能够研究更高的振动模式，并观察非线性和冲击过程中典型的低频和高频之间的能量传递。这些附件可以精确对准测量点，并通过自动模态锤确保实验的良好重复性。