摘要
基于柔性铰链的传动及导向原理,提出一种单自由度对称驱动、导向及转换的直线转换为回转的微动回转机构;机构具有中心对称性,通过铰链对压电致动器的微动直线运动进行导向,将直线运动转换为回转运动,平衡转换过程中产生的横向力及力矩;在建立机构运动学模型的基础上进行运动学分析,推导机构的直线运动输入Δu与回转运动输出Δθ的函数关系;运用有限元法对机构的转换性能进行仿真分析;试验检验该机构的转换性能,试验结果与机构运动学解析误差为8.0%,与有限元分析误差为6.2%;试验表明该机构的运动平稳、线性好,其线性度不小于0.998。运动学分析、有限元仿真及性能试验结果对比验证微动回转机构直线-回转运动转换的准确性及高线性度。本研究具有重要的应用价值。
A micro rotary mechanism with single degree of freedom symmetric drive as well as guiding and transformation is designed based on drive and guiding principles of flexible hinges, which is able to make linear motion transform into accurate rotary motion. The micro rotary mechanism is symmetric to center. The flexible hinges are used to guide the micro linear motion of piezoelectric actuator, which can transform the linear motion into rotary motion and balance the horizontal force and moment during transformation motion. The kinematics of the mechanism is analyzed based on establishing the kinematics model of the mechanism, and the function relationship between linear motion inputΔu and rotary motion outputΔθ of the mechanism is discussed. The simulation to the performance of mechanism transformation is given by the finite element method. The performance of the mechanism motion is tested the experiment, the error between the experimental results and mechanism kinematics analysis is 8.0%, the error between the experimental results and the finite element analysis is 6.2%. The experiment results show that motion of the mechanism is smooth and well in linearity, the lowest linearity is 0.998. The accuracy and high of linearity is proved by the contrast among kinematics analysis, finite element simulation and experimental. This research has the important application value.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第23期8-12,共5页
Journal of Mechanical Engineering
基金
国家重点基础研究发展计划(973计划
2009CB724406)
国家高技术研究发展计划(863计划
2012AA040701-03)
陕西省科技统筹创新工程计划(2011KTZB-01-06-04)
陕西省教育厅科研计划(12JK0684)资助项目
关键词
直线运动
回转运动
微动回转机构
柔性铰链
线性度
linear motion
rotary motion
micro rotary mechanism
flexible hinges
linearity
