• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Mechanical systems and signal processing >Contact acoustic nonlinearity (CAN)-based continuous monitoring of bolt loosening: Hybrid use of high-order harmonics and spectral sidebands
【24h】

Contact acoustic nonlinearity (CAN)-based continuous monitoring of bolt loosening: Hybrid use of high-order harmonics and spectral sidebands

机译：基于接触声非线性（CAN）的螺栓松动连续监测：高次谐波和频谱边带的混合使用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The significance of evaluating bolt tightness in engineering structures, preferably in a continuous manner, cannot be overemphasized. With hybrid use of high-order harmonics (HOH) and spectral sidebands, a contact acoustic nonlinearity (GAN)-based monitoring framework is developed for detecting bolt loosening and subsequently evaluating the residual torque on a loose bolt. Low-frequency pumping vibration is introduced into the bolted joint to produce a "breathing" effect at the joining interface that modulates the propagation characteristics of a high-frequency probing wave when it traverses the bolt, leading to the generation of HOH and vibro-acoustic nonlinear distortions (manifested as sidebands in the signal spectrum). To gain insight into the mechanism of CAN generation and to correlate the acquired nonlinear responses of a loose joint with the residual torque remaining on the bolt, an analytical model based on micro-contact theory is established. Two types of nonlinear index, respectively exploiting the induced HOH and spectral sidebands, are defined without dependence on excitation intensity and are experimentally demonstrated to be effective in continuously monitoring bolt loosening in both aluminum-aluminum and composite-composite bolted joints. Taking a step further, variation of the index pair is quantitatively associated with the residual torque on a loose bolt. The approach developed provides a reliable method of continuous evaluation of bolt tightness in both composite and metallic joints, regardless of their working conditions, from early awareness of bolt loosening at an embryonic stage to quantitative estimation of residual torque.
机译：最好强调以连续方式评估工程结构中螺栓紧密度的重要性。通过混合使用高次谐波（HOH）和频谱边带，开发了基于接触声非线性（GAN）的监视框架，用于检测螺栓松动并随后评估螺栓松动时的残余扭矩。将低频泵浦振动引入到螺栓连接处，以在连接界面处产生“呼吸”效果，该效应调节高频探测波穿过螺栓时的传播特性，从而导致HOH和振动声的产生。非线性失真（表现为信号频谱中的边带）。为了深入了解CAN产生的机理，并使所获得的松动接头的非线性响应与螺栓上残留的残余扭矩相关联，建立了基于微接触理论的分析模型。定义了两种类型的非线性指数，分别利用感应的HOH和谱边带，它们不依赖于激发强度而定义，并通过实验证明可有效地连续监视铝-铝和复合材料螺栓连接中的螺栓松动。更进一步，索引对的变化与松动螺栓上的残余扭矩定量关联。所开发的方法提供了一种可靠的方法，可以连续评估复合材料接头和金属接头中的螺栓紧度，而不论它们的工作条件如何，从早期了解螺栓松动的初期阶段到残余扭矩的定量估算，都可以。

著录项

  • 来源
    《Mechanical systems and signal processing》 |2018年第15期|280-294|共15页
  • 作者

    Zhen Zhang; Menglong Liu; Yaozhong Liao; Zhongqing Su; Yi Xiao;

  • 作者单位

    School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, PR China,Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region;

    Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region;

    Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region;

    Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region;

    School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, PR China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bolt loosening; Nonlinear distortion; High-order harmonic; Vibro-acoustic modulation; Structural health monitoring; Bolted joint;

    机译：螺栓松动;非线性失真;高次谐波;振动声调制;结构健康监测;螺栓连接;

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