高效靶能量转移和耗散的非光滑系统减振技术的实验研究

This project is aimed to establish a nonlinear vibration absorber by shear thickening fluid damper coupled with vibro-impact oscillator, which can achieve highly efficient energy transfer and dissipation, and apply the absorber to non-smooth vibration system to get the system effectively suppressed. The main research contents include: in aspect of suppression structure, construct the absorber by shear thickening fluid damper coupled with vibro-impact oscillator and experimental study on the mechanical properties of the absorber. In aspect of suppression mechanism, identification of nonlinear modal and nonlinear internal resonance, and research on the relationship of nonlinear internal resonance with the energy transfer and dissipation, then investigate the suppression mechanism of non smooth system based experimental results. In aspect of the suppression effect evaluation, by comparing the peak-peak diagram and bifurcation diagram of the system with and without absorber, suppression effect evaluation method will be established. In aspect of parameters optimization of absorber, research on the quantitative optimization method based on suppression mechanism and quantitative optimization method based on suppression effect. In the aspect of experimental and numerical verification, verification of the practicality and reliability of the technology by study typical examples of suppression non-smooth vibration system. The success of this project will improve the stability of passive control and expand the scope of its application, therefore it will have broad application prospects.

本申请项目通过剪切增稠阻尼耦合碰撞振子构造高效的靶能量转移和耗散结构，并以此作为非线性吸振器，耦合非光滑系统，实验研究其靶能量的转移和耗散效率，讨论非线性减振的机理及效率，发展非光滑系统高效稳定的减振技术。研究内容包括：在减振结构方面，实验研究剪切增稠阻尼耦合碰撞振子结构的力学特性。在减振机理方面，在实验基础上探讨非线性模态和非线性内共振的识别，建立非线性内共振和能量转移耗散的关联，探讨非光滑系统减振机理。在减振效果评价方面，构造系统减振前后的峰值-峰值图并对比数值分岔图，建立效果的评价方法。在减振系统参数优化方面，研究基于机理的定性优化方法和基于减振效果的定量优化方法。在实验和数值验证方面，研究典型非光滑系统的减振实例，并通过实验结果和数值对比，验证本技术的实用性和可靠性。通过本申请项目的开展，改善非线性被动控制技术的稳定性，提高其减振效率，扩大应用范围。

本项目构造了剪切增稠阻尼耦合碰撞振子构造高效的靶能量转移和耗散结构，并以此作为非线性吸振器，耦合非光滑系统，数值结合实验研究了靶能量的转移和耗散效率，并讨论非线性减振的机理及效率，发展非光滑系统高效稳定的减振技术。主要研究内容包括：在减振结构方面，实验研究剪切增稠阻尼耦合碰撞振子结构的力学特性。在减振机理方面，在实验基础上探讨非线性模态和非线性内共振的识别，建立非线性内共振和能量转移耗散的关联，探讨非光滑系统减振机理。在减振效果评价方面，构造系统减振前后的峰值-峰值图并对比数值分岔图，建立效果的评价方法。. 通过剪切增稠阻尼耦合碰撞振子应用于机翼结构非线性振动的减振中，通过数值模拟从分叉图及响应峰值图中都可以得到良好的减振效果，并对此非线性机翼模型系统进行风洞实验测试，对比减振前后的加速度响应值，表明靶能量转移和耗散结构在非线性减振中具有现实应用价值。