汽车座椅外文文献.docx

Comparison of Seat System Resonant Frequency Testing Methods
A seat system developed without an accurate structural dynamics model has a higher probability of squeaks, rattles, excessive seat back motion, and poor ride characteristics. If these issues are not addressed during development testing and are allowed to go into production, engineering changes are more costly and difficult to implement. Because today’s seat systems are plex, engineers must use the latest technology to determine the seat system response characteristics.
Modal analysis is the process of developing a dynamic model of a structure or a mechanical system which will be used for problem solving and trouble shooting, simulation, prediction,and optimization. The dynamic model is a set of modal parameters consisting of natural frequencies, damping factors, and mode shapes. These parameters are based on the structure or system. Experimental modal analysis can use either time based, or frequency domain based measurements to calculate the modal parameters. This method provides the most thorough definition of the dynamic response characteristics of the isolated seating system.
Resonant Impact Analysis is used to determine the approximate dynamic response of a seating system. This method provides frequency response functions which describe the natural frequencies of the system. Resonant impact analysis provides in