高速来流下汽车侧窗导槽密封失效条件

Condition of Sealing Failure of a Car Side Window Glassrun Seal System under Wind Excitation

摘要:

汽车高速行驶时，侧窗附近车内外压差较大且压力脉动剧烈，因此侧窗易发生密封不良现象从而产生泄漏噪声，严重影响车内声环境品质。本文将前侧窗导槽密封条作为研究对象，采用稳态压力渗透法和瞬态动力学方法，分析高速来流下引起密封失效的条件，得出以下结论：采用稳态压力渗透法分析显示，导槽密封失效的临界泄漏静压差处于10⁴ Pa数量级，影响泄漏静压差临界值的主要因素包括密封条形状、玻璃位置、材料参数以及密封条固定方式等；采用瞬态动力学分析显示，当侧窗玻璃向内偏移0.2 mm，密封条外唇边在10³ Pa数量级的车内外时变压差作用下即会失效。研究结果对于改进密封条前期设计，预防泄漏噪声的产生具有一定参考价值。

Abstract:

When a car is driven at high speed， there exists large pressure difference with strong pressure fluctuation between the car exterior and interior near the side window area， so the side window sealing system is likely to lose contact and thus generates leak noise， which can influence the interior sound quality seriously. The glassrun seal of the front side window was taken as the research object， with steady pressure penetration method and transient dynamic analysis， the condition of sealing failure occurrence was discussed. The main conclusions are as follows： with steady pressure penetration method， the critical static pressure difference is in the order of 10⁴ Pa. The influence factors of the critical pressure difference include glassrun shape， glass positioning， the rubber material parameters and the fixing manner etc. While with the transient dynamic analysis， as the window glass was offset with 0.2mm inward， the outer lip lost contact under the transient pressure difference in the order of 10³ Pa. The findings provide a meaningful reference for prevention of leak noise generation through improvement of sealing system design.