ABSTRACT

Automobile spring bias crash sensor design time can be significantly reduced by using finite element analysis as a predictive engineering tool.The sensors consist of a ball and springs cased in a plastic housing.Two important factors in the design of crash sensors are the force-displacement response of the sensor and stresses in the sensor springs. In the past,sensors were designed by building and testing prototype hardware until the force-displacement requirements were met. Prototype springs need to be designed well below the elastic limit of the material.Using finite element analysis, sensors can be designed to meet forcedisplacement requirements with acceptable stress levels. The analysis procedure discussed in this paper has demonstrated the ability to eliminate months of prototyping effort.

MSC/ABAQUS has been used to analyze and design airbag crash sensors.The analysis was geometrically nonlinear due to the large deflections of the springs and the contact between the ball and springs. Bezier 3-D rigid surface elements along with rigid surface interface (IRS) elements were used to model ball-to-spring contact.Slideline elements were used with parallel slideline interface (ISL) elements for spring-to-spring contact.
Finite element analysis results for the force-displacement response of the sensor were in excellent agreement with experimental results.


摘要

汽車彈簧碰撞傳感器可以利用有限單元分析軟件進行設(shè)計，這樣可以大大減少設(shè)計時間。該傳感器包括一個球和一個有彈簧在內(nèi)的塑料套管的外殼。傳感器設(shè)計的重要因素是碰撞中的兩個傳感器的力位移響應(yīng)和傳感器的彈簧壓力。以前傳感器的設(shè)計、制作和測試需要滿足力位移原型硬件的要求。彈簧必須遠低于材料的彈性極限而設(shè)計。利用有限元分析，傳感器可以被設(shè)計為滿足力位移的水平壓力。本文的討論說明利用有限單元分析進行設(shè)計可以節(jié)省很多時間。
MSC/ABAQUS已經(jīng)被用于分析和設(shè)計安全氣囊碰撞傳感器。彈簧的大撓度和球與彈簧之間的接觸用幾何非線性分析。貝塞爾三維剛性球表面元素和慣性基準系統(tǒng)剛性表面界面元素被用于塑料球與彈簧接觸面的分析。滑動軌道分析被用于彈簧與彈簧接觸的平行界面間。有限元傳感器的力位移響應(yīng)分析結(jié)果與實驗結(jié)果非常一致。