基于多稳态分岔控制的环境监测微质量传感器设计方法研究

分岔不可控是制约参激非线性微质量传感器工程应用的瓶颈问题。以环境污染和危险品泄漏监测为应用背景，本项目提出基于多稳态结构势阱可设计性和压电控制参数协调的分岔路径控制方法，建立满足环境监测需求的新型微质量传感器设计理论与测试方法，具体包括：1) 建立集线性与非线性力学性能于一体的功能化多稳态结构创新构型设计方法，建立具有跳跃阈值递增且可调特性的多稳态结构设计方法；2) 建立考虑质量吸附膜(形状、位置)、压电材料布置和激励载荷形式(偏置电压、驱动电压幅值与频率)影响的多稳态传感器动力学设计理论与方法，研究多稳态特征参数、压电控制参数及阻尼对跳跃边界的影响关系；3) 建立压电驱动非线性参激振动的机电耦合分析模型，研究分岔拓扑结构与系统物理参数之间的对应关系，建立基于多稳态特征与压电控制参数协同微调方法的分岔路径控制方法；4) 研究稳定而高效的传感器测试方式与激励控制策略，研制新型传感器样件。

Uncontrollable bifurcation is the bottleneck problem for the engineering application of nonlinear parametric resonance mass sensors. The project aims to propose and establish an effective control method for guiding the bifurcation pathway through integrately modifying the multistable structure parameters and piezoelectric parameters, thus establishing the design methods and measuring strategies for multistable bifurcation based micro mass senors applicable to monitor the environment pollution and the hazardous article leakage in real time, which includes: 1) design of the multistable structures integrating the linear and nonlinear mechanical properties to fulfill the application requirements of the real time enviroment monitoring, and also propose effective design method for the multistable structures with incremental jamping thresholds which are adjustable through modifying mechanical structures. 2) establish nonlinear parametric resonance model considering the influences from the sbsorption film, piezoelectric driving materials, and external excitations, and study the influences of the key structural parameters, piezoelectric control parameters and system damping on the jamping boundaries; 3) establish the electromechanical coupling model for the parameteric vibration of piezoelectric driven nonlinear structures, and propose the bifurcation control method through the micro-modulation of the multistable structures and piezoelectric control parameters; 4) analyze the affecting factors from the multistabilities to the sensor’s sensitivity and resolution, and give the stable and efficient measuring methods and control strategies of the external excitation. Finally, the new sensor was designed and fabricated for completing and validating the proposed design methodology.