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

过度振动会导致机器故障并导致故障;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果的研究领域。这项工作的大部分都是由为无线传感器供电的需求驱动的。最佳结果将是同时实现振动抑制和能量收集（VSEH）。现有的研究集中在使用线性质量弹簧阻尼器系统用于此目的。这种装置的缺点是它仅在窄的振动频带内有效。已经对宽带振动抑制或宽带能量收集进行了许多研究。然而，很少有研究报告的同时VSEH宽带环境振动环境下。最近，申请人和他的研究生发起了一个新的研究方向，重点是同步VSEH。受非线性能量汇概念的启发，提出了一种非线性能量汇和能量采集器（NESH）。这项建议将提高宽带能力的同时VSEH利用非线性系统的功能。将讨论三个目标。(1)通过利用非线性系统的特性并改变其配置和连接方案来开发新的NESH设备。(2)对开发的NESH进行建模、分析和测试。建模将通过分析和实验来解决。分析方法主要包括数值积分、非线性简正模态分析和混合多尺度/谐波平衡算法。检测将验证分析研究的结果。(3)通过多目标优化来优化开发的NESH，其中两个相互冲突的目标，最小化振动和最大化能量，将通过适当选择权重因子组合成一个单一的目标函数。同时VSEH的研究是一个相对较新的领域。拟议的研究是新颖的，因为NESH与现有设备不同。拟议研究的成果将是具有许多潜在应用的新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。这项研究是由学术好奇心和工业需求驱动的。将获得新的知识和技术。由于该研究涵盖了广泛的机电一体化，它将为高素质人才的培训提供极好的机会。人们高度期望，从这项研究计划产生的知识和技术将有很大的潜力，有利于加拿大的工业和社会在更安全的机器和结构领域。

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.