摘要
针对微小集中质量测量问题,提出并制备了一种梯形变截面悬臂梁式微质量传感器,建立了梯形变截面悬臂梁式微质量传感器的振动分析模型。采用有限元方法求解其振动控制方程,获得了微质量传感器的灵敏度。仿真分析结果表明,相对于等截面矩形悬臂梁式微质量传感器,单层压电和双层压电结构的变截面悬臂梁传感器的灵敏度分别提高了127.00%和263.00%。采用线切割工艺,加工制备了单压电层梯形变截面结构的微质量传感器并对传感器进行了实验测试,在误差允许范围内,仿真结果与实验结果基本一致,验证了采用梯形变截面悬臂梁式结构可以有效的提高传感器的灵敏度。
A trapezoidal variable cross-section cantilever sensor was designed and fabricated for measuring small lumped masses,and the dynamic vibration model in the form of second order differential equation with variable coefficients is established.The corresponding mass sensitivity was obtained by finite element method(FEM).Comparing with the rectangular constant cross-section type,the sensitivities of the proposed mass sensors with single PZT layer and double PZT layers are improved by 127.00% and 263.00%,respectively.By using wire cutting technology,a trapezoidal variable cross-section cantilever sensor was fabricated which is comprised of one PZT layer bonding to the elastic cantilever for self-exciting,and its sensitivity was tested.The feasibility of introducing trapezoidal variable cross-section cantilever to improve the sensitivity was validated by the good agreement between the experiments and the simulation results.
出处
《传感技术学报》
CAS
CSCD
北大核心
2012年第10期1349-1353,共5页
Chinese Journal of Sensors and Actuators
基金
国家重点基础研究发展计划(973)项目(2011CB610304)
教育部博士学科点基金项目(20090041110023,20100041120019)
关键词
微质量传感器
梯形变截面悬臂梁
灵敏度
谐振频率
mass sensor
trapezoidal variable cross-section cantilever
sensitivity
resonant frequency