汽车座椅外文.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 more complex, 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 information quickly, but does not define the dynamic response characteristics as completely as modal analysis.
Multi-axis shaker table testing is another tool used to determine resonant frequencies in the seat system.  The shaker table is able to input sine sweep and random inputs into the seating system.  The amplitude of the sine sweep or random input can be controlled in acceleration or displacement control.  The shaker table is also capable of simulating road conditions of a customer’s proving grounds in the laboratory.  These roads generate loads in vehicle components such as seats.  Controlled laboratory tests allow duplication of complex multi-channel time histories of a test specimen.  The shaker table can reproduce road inputs in six degrees of freedom: vertical, lateral, longitudinal, pitch, roll, and yaw motions.

不是PDF格式的，本人急需pdf格式的外文

座椅座椅啊，正好用，看看按

The modern ofin the car has two kinds of suspension, a kind of suspension is from move, another a kind of suspension is active of.

好东西，谢谢分享啊！

谢谢分享，thanks for sharing

哇都是英文，看不懂，，

收到下来看看啊应该不错的

座椅的振动，值得关注