Ageing simulation of a hydraulic engine mount: A data-informed finite element approach
Ageing simulation of a hydraulic engine mount: A data-informed finite element approach
复制标题
液压发动机悬置的老化模拟：基于数据的有限元方法
DOI：
10.1177/0954407018786147
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
R. Whear
中科院分区：
文献类型：
--
作者：
P. Soltani;C. Pinna;D. Wagg;R. Whear
液压发动机悬置是机动车辆悬架系统中的关键元件，其通常在其工作寿命期间由于主要来自弹性体部件的渐进材料老化而经历其设计功能的改变。发动机悬置因严重和持续的机械和热负荷而老化，可能对行驶和舒适性以及长期客户满意度产生不利影响。本文介绍了一种新的实用方法，用于模拟发动机悬置的老化行为，导致其弹性主弹簧组件的性能变化。为了实现这一点，一组动态机械热分析测试进行的弹性体试样从一组发动机安装与不同的服务和老化条件。这些实验结果用于表征弹性体机械响应的变化并建立经验弹性体老化模型。在此基础上，采用弹性体老化模型建立了悬置主弹簧的有限元模型，以模拟悬置的老化行为。使用第二批退役发动机悬置的实验结果验证了由此产生的老化模型。结果表明，发动机悬置的垂直静态刚度随着行驶距离（或使用年限）的增加而增加，直到一定距离（约95，000 km）。然后，趋势被逆转，并观察到软化效应。此外，结果表明，最大刚度值和峰值刚度处的行程都随着温度的升高而减小。
Hydraulic engine mounts are key elements in an automotive vehicle suspension system that typically experience a change of their designed function during their working lifetime due to progressive material ageing, primarily from the elastomeric component. Ageing of the engine mount, resulting from severe and continuous mechanical and thermal loads, can have a detrimental impact on the ride and comfort and long-term customer satisfaction. This paper introduces a new practical methodology for simulating the ageing behaviour of engine mounts resulting from the change in properties of their elastomeric main spring component. To achieve this, a set of dynamic mechanical thermal analysis tests were conducted on elastomeric coupons taken from a set of engine mounts with different service and ageing conditions. These experimental results were used to characterise the change in mechanical response of the elastomer and to build up an empirical elastomer ageing model. Then a finite element model of the main spring was developed that used the elastomer ageing model so that the ageing behaviour of the engine mount could be simulated. The resulting ageing model was verified by using experimental results from a second batch of ex-service engine mounts. The results show an increasing trend of the vertical static stiffness of the engine mounts with distance travelled (or age) up to a certain distance (approximately 95,000 km). The trend is then reversed and a softening effect is observed. Moreover, the results reveal that both the maximum stiffness value and the distance travelled at the peak stiffness decrease as the temperature increases.