对称连杆曲线的FFT应用研究  

APPLICATION OF FFT TO SYMMETRIC COUPLER CURVES

作　　者：陈建平[1] 曹清林[1] 沈世德[1] 

机构地区：[1]南通工学院,南通226007

出　　处：《南通工学院学报》1997年第1期14-18,共5页Journal of Nantong Institute of Technology

基　　金：江苏省教委出国留学人员科研启动经费;省教委自然科学基金资助项目

摘　　要：本文对机构学中对称连杆曲线的ＦＦＴ分析和综合方法进行了研究。通过合理地选择坐标轴，使对称连杆曲线的离散数据满足共轭对称性。推导出共轭对称序列的快速付里叶变换ＦＦＴ具有相位为零的特性；建立了单纯由幅度谱值构成的对称连杆曲线的特征参数。对给定需实现的对称运动轨迹，运用最小二乘法进行曲线特征参数的比较，实现连杆曲线及相应机构的综合，提高了效率和精度。This paper studies the FFT analysis and the synthesis method of the symmet- ric coupler curves in mechanism. By properly setting the coordinate axis, the discrete data of a symmetric coupler curve are made to satisfy the conjugate symmetry. Derivation is made about the nature of the FFT for a conjugate-symmetric sequence that its phase is zero. The characteristic values are established of a symmetric coupler curve consisting only of the am- plitudes. For a given desired symmetric kinetic path, the characteristic values of the coupler curves are compared by using the least square method, so that the synthesis of the coupler curve and the corresponding linkage are achieved and their efficiency and accuracy improved.

关 键 词：连杆曲线 曲线拟合 数据处理 FFT 对称连杆曲线 

分 类 号：TH112.1[机械工程—机械设计及理论]