Applied Mathematics and Mechanics (English Edition) ›› 2022, Vol. 43 ›› Issue (7): 979-1000.doi: https://doi.org/10.1007/s10483-022-2862-6

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The X-structure/mechanism approach to beneficial nonlinear design in engineering

Xingjian JING   

  1. Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, China
  • 收稿日期:2021-09-13 修回日期:2021-11-12 出版日期:2022-07-01 发布日期:2022-06-30
  • 通讯作者: Xingjian JING, E-mail: xingjing@cityu.edu.hk
  • 基金资助:
    the Hong Kong Construction Industry Council R&D Fund of China (No. EPS 202017) and the Innovation and Technology Fund of Hong Kong Innovation and Technology Commission of China (No. ITP/020/19AP)

The X-structure/mechanism approach to beneficial nonlinear design in engineering

Xingjian JING   

  1. Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong, China
  • Received:2021-09-13 Revised:2021-11-12 Online:2022-07-01 Published:2022-06-30
  • Contact: Xingjian JING, E-mail: xingjing@cityu.edu.hk
  • Supported by:
    the Hong Kong Construction Industry Council R&D Fund of China (No. EPS 202017) and the Innovation and Technology Fund of Hong Kong Innovation and Technology Commission of China (No. ITP/020/19AP)

摘要: Nonlinearity can take an important and critical role in engineering systems, and thus cannot be simply ignored in structural design, dynamic response analysis, and parameter selection. A key issue is how to analyze and design potential nonlinearities introduced to or inherent in a system under study. This is a must-do task in many practical applications involving vibration control, energy harvesting, sensor systems, robotic technology, etc. This paper presents an up-to-date review on a cutting-edge method for nonlinearity manipulation and employment developed in recent several years, named as the X-structure/mechanism approach. The method is inspired from animal leg/limb skeletons, and can provide passive low-cost high-efficiency adjustable and beneficial nonlinear stiffness (high static & ultra-low dynamic), nonlinear damping (dependent on resonant frequency and/or relative vibration displacement), and nonlinear inertia (low static & high dynamic) individually or simultaneously. The X-structure/mechanism is a generic and basic structure/mechanism, representing a class of structures/mechanisms which can achieve beneficial geometric nonlinearity during structural deflection or mechanism motion, can be flexibly realized through commonly-used mechanical components, and have many different forms (with a basic unit taking a shape like X/K/Z/S/V, quadrilateral, diamond, polygon, etc.). Importantly, all variant structures/mechanisms may share similar geometric nonlinearities and thus exhibit similar nonlinear stiffness/damping properties in vibration. Moreover, they are generally flexible in design and easy to implement. This paper systematically reviews the research background, motivation, essential bio-inspired ideas, advantages of this novel method, the beneficial nonlinear properties in stiffness, damping, and inertia, and the potential applications, and ends with some remarks and conclusions.

关键词: nonlinear stiffness, nonlinear damping, nonlinear inertia, vibration

Abstract: Nonlinearity can take an important and critical role in engineering systems, and thus cannot be simply ignored in structural design, dynamic response analysis, and parameter selection. A key issue is how to analyze and design potential nonlinearities introduced to or inherent in a system under study. This is a must-do task in many practical applications involving vibration control, energy harvesting, sensor systems, robotic technology, etc. This paper presents an up-to-date review on a cutting-edge method for nonlinearity manipulation and employment developed in recent several years, named as the X-structure/mechanism approach. The method is inspired from animal leg/limb skeletons, and can provide passive low-cost high-efficiency adjustable and beneficial nonlinear stiffness (high static & ultra-low dynamic), nonlinear damping (dependent on resonant frequency and/or relative vibration displacement), and nonlinear inertia (low static & high dynamic) individually or simultaneously. The X-structure/mechanism is a generic and basic structure/mechanism, representing a class of structures/mechanisms which can achieve beneficial geometric nonlinearity during structural deflection or mechanism motion, can be flexibly realized through commonly-used mechanical components, and have many different forms (with a basic unit taking a shape like X/K/Z/S/V, quadrilateral, diamond, polygon, etc.). Importantly, all variant structures/mechanisms may share similar geometric nonlinearities and thus exhibit similar nonlinear stiffness/damping properties in vibration. Moreover, they are generally flexible in design and easy to implement. This paper systematically reviews the research background, motivation, essential bio-inspired ideas, advantages of this novel method, the beneficial nonlinear properties in stiffness, damping, and inertia, and the potential applications, and ends with some remarks and conclusions.

Key words: nonlinear stiffness, nonlinear damping, nonlinear inertia, vibration

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