首页> 外文会议>Conference on Active and Passive Smart Structures and Integrated Systems >Adaptive positive position feedback for energy absorption in acoustic cavities
【24h】

Adaptive positive position feedback for energy absorption in acoustic cavities

机译:自适应正位置反馈,可吸收声腔中的能量

获取原文

摘要

A method for adaptive energy absorption in the low frequency region of acoustic cavities is presented. The method is based on an adaptive scheme consisting of a self-tuning regulator (STR) that has the ability to target multiple modes with a single actuator. The inner control loop of the STR uses positive position feedback (PPF) in series with a high- and low-pass Butterworth filters for each controlled mode. The outer loop consists of an algorithm that locates the zero frequencies of the collocated signal and uses these values to update the resonance frequency of the PPF filter and the cut-off and cut-on frequencies of the Butterworth filters. Experimental results of a duct are provided that show how less than a 10 percent change in the frequencies of the acoustic modes of the duct will cause a non-adaptive controller to go unstable, but the STR will maintain stability and continue absorbing energy through a 20 percent change in the frequencies of the acoustic modes of the duct. Additional experimental results of a fairing replica are provided that show internal temperature variations can change the frequencies of the acoustic modes of this larger cavity and that the STR can adapt to these changes and absorb acoustic energy.
机译:提出了一种在声腔低频区域自适应吸收能量的方法。该方法基于一种自适应方案,该方案由一个自调整调节器(STR)组成,该调节器具有通过单个执行器来针对多种模式的能力。 STR的内部控制回路对每个受控模式使用正位置反馈(PPF),并与高通和低通巴特沃斯滤波器串联。外环包含一个算法,该算法可以定位并置信号的零频率,并使用这些值来更新PPF滤波器的谐振频率以及Butterworth滤波器的截止频率和截止频率。提供的管道实验结果表明,管道声学模式的频率变化少于10%会使非自适应控制器变得不稳定,但是STR将保持稳定性并继续通过20吸收能量管道的声模频率变化的百分比。提供了整流罩复制品的其他实验结果,这些结果表明内部温度变化可以改变此较大空腔的声模频率,并且STR可以适应这些变化并吸收声能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号