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为了解决数据控制电路行为中功耗高的问题,论文对调度操作、时钟选择、模块选择和资源分配四个方面进行了深入探讨,并提出了一种降低合成数据路径的功耗迭代改进算法。该算法运用迭代改进策略,能够在寻找低功率解的过程中避免局部解陷入最小值。在考虑多种模块库和复杂的调度结构后,修正了供应电压和时钟选择策略,减少了计算候选供应电压和时钟周期中所涉及的计算工作。实验结果显示出该算法可以形成一个低功率应用的完整数据路径合成系统。 相似文献
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上周,东风日产轩逸1.6L车型正式上市。从2.0L的MR20DE发动机到1.6L的HR16DE发动机,轩逸的"换心",使得一股以降低排量为标志的汽车动力"瘦身"之风再现端倪。殊途同归,另一个已将"瘦身计划"列上日程的是东风雪铁龙毕加索,从最早推出1.6L车型,到升级为2.0L发动机,如今兜了一圈毕加索又将回到原点——据传其1.6L车型不久将重出江湖。 相似文献
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为准确评估汽车碰撞等非线性问题中设计参数的敏感度,提出了基于响应面和Sobol法的全局灵敏度分析策略.以某款轿车车顶压溃为例,以车身上部零件为研究对象,应用多项式响应面建立设计变量与车顶强度的近似模型并开展灵敏度分析,甄别对车顶强度影响较大的关键变量. 相似文献
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Surrogate models are commonly used for approximation of large computationally expensive vehicle crash simulation to facilitate rapid design space exploration and optimization. Unfortunately, the optimum design based on surrogates may turn out to be infeasible after running finite element crash simulation due to the surrogate errors. To meet this challenge, conservative strategy of surrogate modeling through compensating fitting errors was used for reliability based design optimization of vehicle structures for crashworthiness and weight reduction. The critical crash responses were constructed by unbiased kriging models, and conservative surrogates were obtained via adding safety margin to estimate the crash responses conservatively. The benefits of using conservative surrogates for reliability based design optimization were investigated in the context of constraint feasibility of the optimum designs through a mathematical example and a case study on vehicle crashworthiness design. The results demonstrate that optimization based on conservative surrogate helps to achieve the feasible optimum design, showing more attractive for reliability based design optimization in engineering applications. 相似文献
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既有部件用在安全相关的列车运行控制系统之中完成部分系统功能,需要评估其对系统安全性的影响.首先分析既有部件的类型和特点,结合列车运行控制系统安全要求及其证明过程,指出应用既有部件需要解决的问题;然后对系统开发过程中应用既有部件的步骤和安全要求进行分析,提出既有部件的失效控制策略和技术要求;最后分析既有部件安全的证明过程,为基于既有部件的列车运行控制系统安全评估提供建议. 相似文献