Enhanced Vibration Suppression and Energy Harvesting by Exploiting Features of Nonlinear Systems

振动过大会导致机器发生故障并导致故障，因此振动控制对于确保机器正常运行非常重要。最近，从振动中获取能量，而不是通过阻尼来耗散能量，已经成为一个富有成效的研究领域。这项工作的大部分都是由为无线传感器供电的需求推动的。最优的结果是同时实现减振和能量收集(VSEH)。现有的研究主要集中在使用线性质量-弹簧-阻尼器系统来实现这一目的。这种装置的缺点是，它只在很窄的振动频带内有效。在宽带振动抑制或宽带能量采集方面已经进行了大量的研究。然而，在宽带环境振动环境下同时发生振动的研究还很少见报道。最近，申请者和他的研究生发起了一个新的研究方向，重点是同时VSEH。受非线性能量汇概念的启发，研制了一种非线性能量汇与收割机。该方案将通过利用非线性系统的特性来增强同步VSEH的宽带能力。将解决三个目标。(1)利用非线性系统的特点，通过改变其配置和连接方案，开发新的nesh器件。(2)对开发的NEHS进行建模、分析和测试。建模将从分析和实验两方面着手。分析方法主要包括数值积分、非线性简正波分析和混合多尺度/调和平衡算法。测试将验证分析研究的结果。(3)通过多目标优化将振动最小化和能量最大化这两个相互冲突的目标通过适当的权重因子组合成一个单目标函数，对已开发的NEHS进行优化。同时VSEH的研究是一个相对较新的领域。这项拟议的研究是新颖的，因为Nesh不同于现有的设备。拟议研究的结果将是具有许多潜在应用的新型VSEH设备，例如使用自供电无线传感器监测机器和结构的完整性。这项研究既有学术上的好奇心，也有工业上的需要。将获得新的知识和技术。由于这项研究涵盖了机电一体化的广泛领域，它将为培训高素质的人才提供绝佳的机会。人们高度期待，这项研究计划产生的知识和技术将在更安全的机器和结构领域为加拿大的工业和社会带来巨大的潜力。

Excessive vibration causes machines to malfunction and leads to failure; therefore, vibration control is important to ensure that machines operate properly. Recently, harvesting the energy from vibrations, instead of dissipating it through damping, has become a fruitful area of study. Much of this work has been driven by the need to power wireless sensors. The optimal outcome would be to achieve vibration suppression and energy harvesting (VSEH) simultaneously. The existing research has focused on using a linear mass-spring-damper system for this purpose. The shortcoming of such a device is that it is effective only in a narrow vibrational frequency band. Many studies have been conducted on broadband vibration suppression or broadband energy harvesting. However, few studies on simultaneous VSEH under broadband ambient vibration environment have been reported. Recently the applicant and his graduate students have initiated a new research direction that focuses on simultaneous VSEH. Inspired by the concept of the nonlinear energy sink, a nonlinear energy sink and harvester (NESH) was developed. This proposal will enhance the broadband capability of simultaneous VSEH by exploiting features of nonlinear systems. Three objectives will be addressed. (1) Develop new NESH devices by exploiting the features of nonlinear systems and varying their configurations and attachment schemes. (2) Model, analyze, and test developed NESHs. Modelling will be tackled both analytically and experimentally. Analysis approaches will primarily include numerical integration, nonlinear normal mode analysis, and the mixed Multiple Scale/Harmonic Balance algorithm. Testing will validate the results of the analytical studies. (3) Optimize developed NESHs through multi-objective optimization, in which two conflicting goals, minimizing vibration and maximizing energy, will be combined into a single objective function by properly choosing weight factors. Research on simultaneous VSEH is a relatively new area. The proposed research is novel, because the NESH is different from existing devices. The outcomes of the proposed research will be new VSEH devices with many potential applications, such as monitoring the integrity of machines and structures using self-powered wireless sensors. The study is driven both by academic curiosity and industrial need. New knowledge and techniques will be gained. Because the study covers a wide spectrum of mechatronics, it will provide excellent opportunities for the training of highly qualified personnel. It is highly anticipated that the knowledge and techniques generated from this research program will have a strong potential to benefit to Canada’s industry and society in the areas of safer machines and structures.