Identification and comparative analysis of vibration modal parameters of rice planter frame

Modal parameter analysis is a common method for structural characteristic analysis. To accurately identify the modal parameters that describe vibration characteristics of structure, chassis frame rice transplanter taken as research object. The least squares complex frequency domain method, admittance circle and peak picking are used to process measured signal. parameters, such natural frequency, damping ratio, shape frame, obtained. Except eight-order error greater than 10%, errors all other orders less 10%. In test structure transplanter, identification results generally reliable. recognition accuracy PolyLeast-Squares Complex Frequency (PolyLSCF) algorithm lower picking. values some off-diagonal elements in mass matrix calculated by PolyLSCF 0.2. diagonal 1.