Evaluating the Potential for Secondary Mass Savings in Vehicle Lightweighting
Evaluating the Potential for Secondary Mass Savings in Vehicle Lightweighting
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DOI：
10.1021/es202938m
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发表时间：
2012-03-06
影响因子：
11.4
通讯作者：
Kirchain, Randolph E.
中科院分区：
文献类型：
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作者：
Alonso, Elisa;Lee, Theresa M.;Kirchain, Randolph E.
二次质量节省是指当车辆总质量（GVM）减少时，在支撑（承载）车辆部件时可能实现的质量减少。质量分解是一个过程，通过这个过程，当二次质量节省导致GVM进一步减少时，可以确定进一步减少。最大化二次质量节省（SMS）是最大化车辆燃料经济性的关键工具。在今天的。在工业中，最复杂的部分，需要大量的设计细节（和成本），首先设计和冻结，而其余的开发过程的进展。本文提出了一种工具，估计SMS的潜力在设计过程中的早期，并显示如何使用该工具设置SMS的目标早，子系统被锁定之前，最大限度地节省大量的。SMS在当前乘用车的潜力估计与经验模型，使用工程分析的车辆部件，以确定质量的依赖性。确定的质量相关的组件被分组为子系统，并进行线性回归子系统质量作为GVM的函数。进行蒙特卡罗模拟以确定每千克保存的初级质量的SMS势的平均值以及第5和第95位数。该模型预测，平均理论次级质量节省潜力为每节省1 kg初级质量节省0.95 kg，当所有部件都可重新设计时，第5百分位数为0.77 kg/kg。该模型被用来探索一个替代方案，其中现实的制造和设计限制实施。在本案例研究中，锁定了4个关键子系统（共13个），这将SMS潜力降低至平均值0.12 kg/kg，第5百分位数为0.1 kg/kg。显然，为了最大限度地发挥质量减少的影响，需要在子系统被锁定之前确定目标。
Secondary mass savings are mass reductions that may be achieved in supporting (load-bearing) vehicle parts when the gross vehicle mass (GVM) is reduced. Mass decompounding is the process by which it is possible to identify further reductions when secondary mass savings result in further reduction of GVM. Maximizing secondary mass savings (SMS) is a key tool for maximizing vehicle fuel economy. In today's. industry, the most complex parts, which require significant design detail (and cost), are designed first and frozen while the rest of the development process progresses. This paper presents a tool for estimating SMS potential early in the design process and shows how use of the tool to set SMS targets early, before subsystems become locked in, maximizes mass savings. The potential for SMS in current passenger vehicles is estimated with an empirical model using engineering analysis of vehicle components to determine mass-dependency. Identified mass-dependent components are grouped into subsystems, and linear regression is performed on subsystem mass as a function of GVM. A Monte Carlo simulation is performed to determine the mean and 5th and 95th percentiles for the SMS potential per kilogram of primary mass saved. The model projects that the mean theoretical secondary mass savings potential is 0.95 kg for every 1 kg of primary mass saved, with the 5th percentile at 0.77 kg/kg when all components are available for redesign. The model was used to explore an alternative scenario where realistic manufacturing and design limitations were implemented. In this case study, four key subsystems (of 13 total) were locked-in and this reduced the SMS potential to a mean of 0.12 kg/kg with a 5th percentile of 0.1 kg/kg. Clearly, to maximize the impact of mass reduction, targets need to be established before subsystems become locked in.